JP6285902B2 - Rotating equipment for construction machinery - Google Patents

Description

  The present invention relates to a traveling device used in a crawler-type construction machine such as a hydraulic excavator, and a rotating device such as a crawler belt guide roller.

  In general, a lower traveling body of a crawler-type construction machine such as a hydraulic excavator is provided with a track frame having left and right side frames, a traveling device provided on one end side of each side frame, and the other end side of each side frame. It is generally configured by an idler wheel provided, a drive wheel (sprocket) provided in the traveling device, and a crawler belt wound around the idler wheel.

  A traveling device of a hydraulic excavator usually includes a hydraulic motor that serves as a rotation source, and a reduction device that decelerates and outputs the rotation of the hydraulic motor. The reduction device includes a fixed-side housing that houses the rotation source, A rotation-side housing that is rotatably provided to the fixed-side housing and is driven by a rotation source, a speed reduction mechanism that is housed in the rotation-side housing and decelerates rotation of the rotation source, and between the fixed-side housing and the rotation-side housing In order to seal the gap, a floating seal provided on the inner peripheral side of the gap is provided.

  Here, the gap between the fixed housing and the rotary housing is formed in an annular shape between the end face of the fixed housing and the end face of the rotary housing facing each other in the axial direction, and the floating seal is within the gap. A pair of seal rings arranged on the circumferential side and having sliding contact surfaces that are in sliding contact with each other, and between the one seal ring and the fixed-side housing and between the other seal ring and the rotation-side housing across the gap. And a pair of O-rings provided between the two. The sliding contact surface of each seal ring is in sliding contact with an appropriate surface pressure by the elastic force of the O-ring, so that the lubricating oil can be sealed in the reduction gear, and the reduction gear can be lubricated with this lubricating oil.

  By the way, since the hydraulic excavator travels on rough terrain such as muddy ground, foreign matters such as earth and sand enter a gap between the stationary housing and the rotating housing. The earth and sand that has entered the gap accumulates around the floating seal without being discharged to the outside.

  The earth and sand deposited around the floating seal causes pressure to act unevenly on the annular O-ring. As a result, the surface pressure acting on the sliding contact surfaces of the pair of seal rings becomes non-uniform due to the elastic force of the O-ring, and the lubricating oil sealed by the floating seal leaks to the outside, thereby impairing the lubricity of the reduction gear. there is a possibility.

  On the other hand, a seal housing groove is formed on the end surface on the fixed body side, a seal ring formed of a low friction resin material in the seal housing groove, and an O-ring and an X ring that press the seal ring against the end surface of the fixed body There is known a sealing structure in which a gap formed between a fixed body and a rotating body is sealed by disposing an elastic body such as (Patent Documents 1 and 2).

JP2013-210071A JP 2013-210068 A

  However, even in the above-described seal structure according to the prior art, when the earth and sand penetrates into the seal accommodation groove and accumulates in the seal accommodation groove, the accumulated earth and sand are uneven with respect to the elastic body such as an O-ring. Pressure acts. As a result, the pressing force acting on the seal ring from the elastic body becomes non-uniform, and there is a problem that the sealing performance of the seal ring is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and suppresses the intrusion of foreign matter such as earth and sand around the floating seal through a gap formed between the fixed body and the rotating body. An object of the present invention is to provide a construction machine rotating device capable of maintaining a proper sealability over a long period of time.

  In order to solve the above-described problems, the present invention provides a fixed body fixed to a vehicle body of a construction machine, a rotating body rotatably provided to the fixed body, and a fixed body side end surface of the fixed body facing in the axial direction. And a gap formed between the rotating body side end surface of the rotating body and a floating member that is provided between the fixed body and the rotating body and is located radially inside the gap and seals the gap. The present invention is applied to a rotation device for a construction machine that includes a seal and a labyrinth that is provided between the fixed body and the rotating body and is positioned radially outside the gap and communicates with the gap.

  A feature of the configuration employed by the present invention is that the gap is provided on the fixed body side end face and the rotating body side end face, located on the outer side in the radial direction than the gap and on the inner side in the radial direction with respect to the labyrinth. An elastic body accommodating space having a larger axial dimension than that, an annular elastic body provided in the elastic body accommodating space and covering the gap from the outside in the radial direction in a state in which the space is stopped with respect to the rotating body, A spring that presses the elastic body in the axial direction toward the fixed body, and an outer peripheral surface of the elastic body has an inclined surface that gradually decreases in outer diameter from the fixed body toward the rotating body. It is in providing.

  According to the present invention, the elastic body is provided in the elastic body accommodating space having a larger axial dimension than the gap between the fixed body and the rotating body, and the gap is covered from the outside in the radial direction by the elastic body. It is possible to prevent foreign substances such as from entering the periphery of the floating seal through the gap. As a result, the sealing performance of the floating seal can be maintained properly over a long period of time, and the rotating body can be rotated smoothly.

  In addition, by pressing the elastic body housed in the elastic body housing space in the axial direction toward the fixed body by the spring, the elastic body can be brought into close contact with the fixed body, and the gap is formed by the elastic body. It can block more firmly. Furthermore, by providing an inclined surface on the outer peripheral surface of the elastic body, when the earth and sand accumulates in the elastic body accommodation space, the elastic body is fixed using the force by which the accumulated earth and sand presses the inclined surface of the elastic body. Since it can be pressed against the body, foreign matter such as earth and sand can be prevented from entering the periphery of the floating seal through the gap over a long period of time.

It is a front view which shows the hydraulic shovel provided with the traveling apparatus as a rotation apparatus by the 1st Embodiment of this invention. It is sectional drawing which looked at the hydraulic motor of the lower traveling body, the reduction gear, the drive wheel, the crawler belt, etc. from the arrow II-II direction in FIG. It is a principal part expanded sectional view which expands and shows the stationary side housing, rotation side housing, elastic body, etc. by 1st Embodiment. FIG. 4 is an exploded cross-sectional view illustrating a state in which a rotating side housing and an elastic body are removed from the fixed side housing in FIG. 3. It is a partially broken perspective view which shows an elastic body alone. It is a disassembled sectional view which shows the state which removed the elastic body from the rotation side housing. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 2nd Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 3rd Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 4th Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 5th Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 6th Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary-side housing, rotation side housing, elastic body, etc. by 7th Embodiment. It is a principal part expanded sectional view similar to FIG. 3 which shows the stationary side housing by the 8th Embodiment, a rotation side housing, an elastic body, etc. It is sectional drawing which looked at the lower guide roller, side frame, crawler belt, etc. as a rotating device by 9th Embodiment from the arrow XIV-XIV direction in FIG. It is the principal part expanded sectional view which expanded the fixed body, rotary body, elastic body, etc. in FIG. It is a principal part expanded sectional view similar to FIG. 3 which shows the elastic body by a modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a construction machine rotating device according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 6 show a first embodiment of the present invention and illustrate a traveling device of a hydraulic excavator as a rotating device.

  In the drawing, a hydraulic excavator 1 is a typical example of a construction machine, and a vehicle body of the hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper portion mounted on the lower traveling body 2 so as to be capable of turning. It is comprised with the turning body 3. FIG. The working device 4 is provided on the front side of the upper swing body 3 so as to be able to move up and down, and the excavator 1 performs excavation work such as earth and sand using the working device 4.

  The lower traveling body 2 includes a track frame 5 having left and right side frames 5A (only the left side is illustrated) extending in the front and rear directions, and a traveling device described later provided on one end side in the longitudinal direction of each side frame 5A. 9, idler wheels 6 provided on the other end side in the longitudinal direction of each side frame 5A, a plurality of lower guide rollers 7 provided on the lower side of each side frame 5A, idler wheels 6, and each lower guide roller 7 and a crawler belt 8 wound around a drive wheel 21 described later.

  As shown in FIG. 2, the traveling device 9 as a rotating device includes a traveling device bracket 10 fixed to one end side in the longitudinal direction of each side frame 5A, a hydraulic motor 11 attached to the traveling device bracket 10, A later-described reduction device 12 that decelerates the rotation of the hydraulic motor 11 is included. The traveling device 9 decelerates the rotation of the hydraulic motor 11 by the speed reducer 12, thereby rotating a driving wheel 21 (described later) with a large torque, and circulates the crawler belt 8 wound around the driving wheel 21 and the idler wheel 6. It is to be driven.

  The speed reducer 12 decelerates the rotation of the hydraulic motor 11. The speed reduction device 12 includes a stationary housing 13, a rotation side housing 15, planetary gear speed reduction mechanisms 24, 25, 26, a floating seal 27, an elastic body accommodating space 33, an elastic body 36, and the like which will be described later.

  The stationary housing 13 as a stationary body is provided fixed to the traveling device bracket 10. The stationary housing 13 is to which the hydraulic motor 11 is attached. Here, the stationary housing 13 has a large-diameter flange portion 13 </ b> A, and the flange portion 13 </ b> A is fixed to the traveling device bracket 10 using a plurality of bolts 14.

  As shown in FIG. 3, a housing support portion 13 </ b> B that supports a rotation-side housing 15, which will be described later, and a carrier 26 </ b> C of a planetary gear speed reduction mechanism 26, which will be described later, are provided on the distal end side of the stationary housing 13 that protrudes from the traveling device bracket 10. A male spline portion 13C to be coupled is provided. Further, a cylindrical seal mounting portion 13D to which a fixed-side seal ring 28 described later is attached is provided between the flange portion 13A and the housing support portion 13B. The tip of the seal mounting portion 13D is an annular fixed body side end surface 13E positioned radially outside the floating seal 27, and this fixed body side end surface 13E is axially aligned with a rotary body side end surface 15C of the rotary housing 15 described later. And face each other at intervals. In addition, an annular fixed body-side recessed portion 13F constituting a labyrinth 32 described later is formed on the outer peripheral edge portion of the fixed body-side end surface 13E.

  The rotating side housing 15 as a rotating body is provided to be rotatable with respect to the fixed side housing 13. The rotation side housing 15 is formed in a covered cylindrical shape as a whole, and accommodates the planetary gear reduction mechanisms 24, 25, and 26 therein. Here, the rotation side housing 15 is fixed to the inner peripheral side of the annular flange portion 15A disposed on the outer peripheral side of the housing support portion 13B provided on the fixed side housing 13, and the flange portion 15A using bolts 16. A cylindrical ring gear 17 in which inner teeth 17A and 17B are formed, and a disc-shaped lid 18 that covers the ring gear 17 are configured.

  The inner peripheral side of the flange portion 15 </ b> A is rotatably attached to the housing support portion 13 </ b> B of the fixed side housing 13 via a bearing 19. A drive wheel (sprocket) 21 is fixed to the outer peripheral side of the flange portion 15 </ b> A using a plurality of bolts 20. Further, a cylindrical seal mounting portion 15B to which a rotation side seal ring 29 described later is attached is provided on the inner peripheral side of the flange portion 15A. The distal end portion of the seal mounting portion 15B is located on the outer side in the radial direction with respect to the floating seal 27, and is an annular rotator-side end surface 15C that faces the fixed-body-side end surface 13E of the fixed-side housing 13 in the axial direction.

  Between the rotating body side end face 15 </ b> C and the fixed body side end face 13 </ b> E of the fixed housing 13, an axial gap 22 described later is formed over the entire circumference. Further, a cylindrical rotator-side protrusion 15D that protrudes toward the fixed housing 13 is provided on the outer peripheral side of the rotator-side end face 15C. The rotating body side projecting portion 15D faces the fixed body side recessed portion 13F of the fixed side housing 13 with a gap in the radial direction, and constitutes a labyrinth 32 described later.

  The axial gap 22 is formed in an annular shape over the entire circumference between the fixed body side end face 13E of the fixed side housing 13 and the rotary body side end face 15C of the flange portion 15A constituting the rotary side housing 15. A floating seal 27 is provided inside the gap 22 in the radial direction.

  The rotation shaft 23 is provided in the rotation side housing 15 and derives the rotation output of the hydraulic motor 11. The proximal end side of the rotating shaft 23 is connected to the output shaft of the hydraulic motor 11, and the distal end side of the rotating shaft 23 extends in the ring gear 17 in the axial direction. A sun gear 24A, which will be described later, is integrally formed at the tip of the rotary shaft 23 located in the vicinity of the lid 18.

  Three-stage planetary gear reduction mechanisms 24, 25, and 26 are provided in the rotation-side housing 15. These three-stage planetary gear reduction mechanisms 24, 25, and 26 reduce the rotation of the hydraulic motor 11 by three stages and rotate the drive wheels 21 attached to the flange portion 15 </ b> A of the rotation-side housing 15 with a large torque. .

  Here, the first stage planetary gear speed reduction mechanism 24 meshes with the sun gear 24A integrally formed at the tip of the rotating shaft 23, the sun gear 24A, and the internal teeth 17A of the ring gear 17, and around the sun gear 24A. A plurality of planetary gears 24B (only one is shown) that revolves while rotating, and a carrier 24C that rotatably supports each planetary gear 24B. Then, the first stage planetary gear speed reduction mechanism 24 decelerates the rotation of the sun gear 24A, and transmits the revolution of each planetary gear 24B to the second stage sun gear 25A described later via the carrier 24C.

  The second-stage planetary gear speed reduction mechanism 25 includes a cylindrical sun gear 25A splined to the first-stage carrier 24C while being loosely fitted to the rotary shaft 23, and internal teeth 17A of the sun gear 25A and the ring gear 17. And a plurality of planetary gears 25B (only one shown) that revolves around the sun gear 25A and revolves around the sun gear 25A, and a carrier 25C that rotatably supports each planetary gear 25B. Then, the second stage planetary gear speed reduction mechanism 25 decelerates the rotation of the sun gear 25A, and transmits the revolution of each planetary gear 25B to the third stage sun gear 26A described later via the carrier 25C.

  The third-stage planetary gear speed reduction mechanism 26 includes a cylindrical sun gear 26A splined to the second-stage carrier 25C while being loosely fitted to the rotary shaft 23, and internal teeth 17B of the sun gear 26A and the ring gear 17. And a plurality of planetary gears 26B (only one is shown) that revolves around the sun gear 26A and revolves around the sun gear 26A, and a carrier 26C that rotatably supports each planetary gear 26B.

  Here, the third-stage carrier 26 </ b> C is spline-coupled to the male spline portion 13 </ b> C of the stationary housing 13. Therefore, the revolution of each planetary gear 26 </ b> B supported by the carrier 26 </ b> C is transmitted to the rotation-side housing 15 through the internal teeth 17 </ b> B of the ring gear 17. Thereby, the rotation-side housing 15 is configured to rotate with respect to the stationary-side housing 13 in a state where the rotation-side housing 15 is decelerated by three stages by the planetary gear reduction mechanisms 24, 25, and 26.

  Here, the rotation-side housing 15 is filled with lubricating oil for lubricating the planetary gear speed reduction mechanisms 24, 25, 26, the bearing 19, and the like. It is configured to be sealed inside.

  The floating seal 27 is provided on the inner side in the radial direction than the gap 22 formed between the stationary housing 13 and the rotating housing 15. The floating seal 27 seals the lubricating oil L in the rotation side housing 15 and suppresses entry of foreign matter such as muddy water and earth and sand into the rotation side housing 15. Here, as shown in FIGS. 3 and 4, the floating seal 27 includes a fixed-side seal ring 28, a rotation-side seal ring 29, a fixed-side O-ring 30, and a rotation-side O-ring 31 which will be described later. .

  The fixed side seal ring 28 is disposed on the inner peripheral side of the seal mounting portion 13 </ b> D provided in the fixed side housing 13. The stationary-side seal ring 28 is paired with the rotation-side seal ring 29, and is formed in a cylindrical shape using a metal material having excellent wear resistance and corrosion resistance, for example. Here, the fixed-side seal ring 28 is provided with a large-diameter flange 28A, and an annular sliding contact surface 28B is formed on the end surface of the large-diameter flange 28A. The outer peripheral surface 28C of the fixed seal ring 28 facing the inner peripheral surface 13G of the seal mounting portion 13D is a tapered surface that gradually increases in diameter toward the large-diameter flange portion 28A. The outer peripheral surface 28C and the seal mounting portion A fixed-side O-ring 30 described later is provided between the inner peripheral surface 13G of 13D.

  The rotation-side seal ring 29 is disposed on the inner peripheral side of the seal mounting portion 15B provided on the flange portion 15A of the rotation-side housing 15. The rotation-side seal ring 29 is composed of the same parts as the fixed-side seal ring 28. Here, the rotation-side seal ring 29 is provided with a large-diameter flange portion 29A, and an annular sliding contact surface 29B is formed on the end surface of the large-diameter flange portion 29A. Further, the outer peripheral surface 29C of the rotation-side seal ring 29 that faces the inner peripheral surface 15E of the seal mounting portion 15B is a tapered surface that gradually expands toward the large-diameter flange portion 29A, and this outer peripheral surface 29C and the seal mounting portion A rotation-side O-ring 31 described later is provided between the inner peripheral surface 15E of 15B.

  The fixed-side O-ring 30 is provided between the inner peripheral surface 13G of the seal mounting portion 13D provided in the fixed-side housing 13 and the outer peripheral surface 28C of the fixed-side seal ring 28. The fixed-side O-ring 30 is paired with the rotation-side O-ring 31 and is formed in an annular shape using, for example, a rubber material having oil resistance and elasticity such as butadiene rubber. The fixed-side O-ring 30 seals between the seal mounting portion 13D of the fixed-side housing 13 and the fixed-side seal ring 28, and the fixed-side seal ring 28 is always directed in the axial direction toward the rotation-side seal ring 29. Press.

  The rotation-side O-ring 31 is provided between the inner peripheral surface 15E of the seal mounting portion 15B provided on the flange portion 15A of the rotation-side housing 15 and the outer peripheral surface 29C of the rotation-side seal ring 29. The rotation-side O-ring 31 is composed of the same parts as the fixed-side O-ring 30 and seals between the seal mounting portion 15B of the flange portion 15A and the rotation-side seal ring 29, and the rotation-side seal ring 29 is fixed to the fixed-side seal ring. It always presses in the axial direction toward 28.

  Thereby, the sliding contact surface 28B of the fixed side seal ring 28 and the sliding contact surface 29B of the rotation side seal ring 29 are appropriately adjusted by the axial pressing force applied from the fixed side O ring 30 and the rotation side O ring 31. Slid in contact. Therefore, when the rotation-side housing 15 rotates with respect to the fixed-side housing 13, the sliding contact surface 28B of the fixed-side seal ring 28 and the sliding contact surface 29B of the rotation-side seal ring 29 are in fluid-tight sliding contact with each other. The lubricating oil L can be sealed in 15.

  The labyrinth 32 is located on the outer side in the radial direction with respect to the gap 22, is provided between the stationary housing 13 and the rotating housing 15, and communicates with the gap 22. Here, as shown in FIG. 3, the labyrinth 32 has an annular fixed body side recessed portion 13F formed on the outer peripheral side of the fixed body side end surface 13E and a cylindrical rotary body side formed on the outer peripheral side of the rotary body side end surface 15C. It is formed between the protrusion 15D. The labyrinth 32 is for preventing large earth and sand from entering into an elastic body accommodating space 33 described later by forming a crank-shaped maze.

  Next, the elastic body accommodation space 33 and the elastic body 36 used in the first embodiment will be described.

  The elastic body accommodating space 33 is provided on the fixed body side end face 13 </ b> E and the rotating body side end face 15 </ b> C so as to be located on the radially outer side of the gap 22 and the radially inner side of the labyrinth 32. Here, as shown in FIGS. 3 and 4, the elastic body accommodation space 33 includes an annular fixed body side accommodation space 34 recessed in the stationary body side end face 13E and an annular rotation recessed in the rotary body side end face 15C. The body side accommodation space 35 is comprised.

  The stationary body side accommodation space 34 is formed as an annular groove centered on the rotation axis of the rotation side housing 15. The stationary body side accommodation space 34 is a quadrangular cross-sectional shape surrounded by a bottom surface 34A serving as a groove bottom, an inner diameter surface 34B positioned on the inner diameter side of the annular groove, and an outer diameter surface 34C positioned on the outer diameter side of the annular groove. have. And in the fixed body side accommodation space 34, the fixed body contact part 36A of the elastic body 36 mentioned later is fitted so that sliding is possible.

  The rotating body side accommodation space 35 is formed as an annular groove with the rotation axis of the rotation side housing 15 as the center. The rotor-side accommodation space 35 is also a quadrangular cross-sectional shape surrounded by a bottom surface 35A serving as a groove bottom, an inner diameter surface 35B positioned on the inner diameter side of the annular groove, and an outer diameter surface 35C positioned on the outer diameter side of the annular groove. have. Here, two long grooves 35D extending in the direction from the rotating body side end face 15C toward the bottom face 35A are formed in the inner diameter surface 35B of the rotating body side accommodation space 35 (see FIG. 6). These two long grooves 35D are arranged at intervals of 180 degrees in the circumferential direction, and engage with a ball 37 described later.

  The elastic body 36 is provided in the elastic body accommodating space 33, and covers the gap 22 formed between the fixed body side end face 13E and the rotating body side end face 15C from the outside in the radial direction. The elastic body 36 is formed in a cylindrical shape using a resin material.

  Here, as shown in FIGS. 3 to 6, the elastic body 36 is fixed to the fixed body contact portion 36 </ b> A that slidably contacts the bottom surface 34 </ b> A of the fixed body side storage space 34 and the bottom surface 35 </ b> A of the rotary body side storage space 35. And a rotating body abutting portion 36B that abuts. The rotating body abutting portion 36B is integrally formed with a thin bent portion 36C having an inverted J shape, and this bent portion 36C constitutes a spring that presses the elastic body 36 toward the stationary housing 13 in the axial direction. doing. As a result, the spring force from the bent portion 36C that is in contact with the bottom surface 35A of the rotating body-side accommodation space 35 always acts on the elastic body 36 accommodated in the elastic body accommodation space 33. The contact portion 36 </ b> A can be brought into close contact with the bottom surface 34 </ b> A of the stationary body side accommodation space 34.

  The outer peripheral surface of the elastic body 36 includes a cylindrical surface 36D that engages with the fixed body-side accommodation space 34, and an inclined surface that is inclined so that the outer diameter dimension gradually decreases from the cylindrical surface 36D toward the rotating body contact portion 36B. 36E. Thus, by providing the inclined surface 36E on the outer peripheral surface of the elastic body 36, when the earth and sand M indicated by a two-dot chain line is accumulated in the elastic body accommodating space 33 as shown in FIG. M can press the inclined surface 36E of the elastic body 36 in the direction of arrow F, and press the fixed body abutting portion 36A of the elastic body 36 against the bottom surface 34A of the fixed body side accommodation space 34.

  Here, as shown in FIG. 4, the axial dimension A of the cylindrical surface 36D is set smaller than the axial dimension (depth dimension) B from the fixed body side end surface 13E to the bottom surface 34A of the fixed body side accommodation space 34. (A <B). As a result, as shown in FIG. 3, the cylindrical surface 36D of the elastic body 36 can be stored in the fixed body-side accommodation space 34, and earth or sand that has entered the elastic body accommodation space 33 through the labyrinth 32 causes the inclined surface 36E. By providing, it will accumulate on the bottom face 35A side of the rotating body side accommodation space 35. Accordingly, the accumulated earth and sand push the inclined surface 36E and press the fixed body abutting portion 36A, so that the earth and sand slides between the fixed body abutting portion 36A of the elastic body 36 and the bottom surface 34A of the stationary body side accommodation space 34. It is possible to suppress direct intrusion into the network.

  On the other hand, two hemispherical concave portions 36G are provided on the inner peripheral surface 36F of the elastic body 36 at intervals of 180 degrees in the circumferential direction. Each of the recessed portions 36G is disposed at a position corresponding to the inner portion 35E of the two long grooves 35D formed on the bottom surface 35A of the rotating body side accommodation space 35. Then, a ball 37 as a detent member is fitted in each long groove 35 </ b> D formed in the bottom surface 35 </ b> A of the rotating body-side accommodation space 35 and each concave recess 36 </ b> G of the elastic body 36.

  Therefore, the elastic body 36 accommodated in the elastic body accommodating space 33 is movable in the axial direction and is prevented from rotating in the circumferential direction with respect to the rotation-side housing 15, whereby the fixed body abutting portion 36 </ b> A is moved to the fixed body side. It is brought into sliding contact with the bottom surface 34 </ b> A of the accommodation space 34. In this way, by rotating the elastic body 36 relative to the rotation-side housing 15, when earth and sand or the like enter the elastic body accommodation space 33 through the labyrinth 32 when the hydraulic excavator 1 travels, the earth and sand are elastic body. It will adhere uniformly to the circumferential direction of 36, and it has the structure which can equalize the pressure from the earth and sand which acts on the elastic body 36.

  The traveling device 9 as a rotating device according to the first embodiment has the above-described configuration. When the hydraulic motor 11 is rotated during traveling of the hydraulic excavator 1, the rotation of the hydraulic motor 11 is reduced by the speed reduction device 12. The planetary gear reduction mechanisms 24, 25, and 26 are reduced by three stages and transmitted to the rotation side housing 15. As a result, the rotation-side housing 15 rotates with a large torque, and the crawler belt 8 wound around the drive wheel 21 and the idler wheel 6 fixed to the rotation-side housing 15 is driven, and the excavator 1 travels.

  Here, the rotation-side seal ring 29 of the floating seal 27 rotates integrally with the rotation-side housing 15, and the rotation-side seal ring 29 slides the sliding contact surface 29 </ b> B on the sliding contact surface 28 </ b> B of the fixed seal ring 28. As a result, the space between the rotation-side housing 15 and the stationary-side housing 13 is sealed in a liquid-tight manner. Thereby, the lubricating oil L is held in the rotating side housing 15, and the lubricating oil L can properly lubricate the bearing 19, the planetary gear reduction mechanisms 24, 25, 26, etc., and the rotating side housing 15 can be smoothly smoothed. Can be rotated.

  At this time, the elastic body 36 accommodated in the elastic body accommodating space 33 rotates integrally with the rotation-side housing 15, while the fixed-body-side end surface 13 </ b> E of the fixed-side housing 13 and the rotation-body-side end surface 15 </ b> C of the rotation-side housing 15. An axial gap 22 formed therebetween is covered from the outside in the radial direction. As a result, even when dirt or the like enters the labyrinth 32 when the excavator 1 travels in a muddy area, the elastic body 36 prevents the earth or the like from entering the periphery of the floating seal 27 through the gap 22. be able to.

  Thereby, it is possible to prevent pressure from acting on the fixed-side O-ring 30 and the rotation-side O-ring 31 of the floating seal 27 from the earth and sand accumulated around the floating seal 27. Therefore, the sliding force contact surface 28B of the stationary seal ring 28 and the sliding contact surface 29B of the rotation side seal ring 29 are appropriately slid with uniform surface pressure over the entire circumference by the elastic force of the O-rings 30 and 31. The sealing property of the floating seal 27 can be ensured.

  As a result, the lubricating oil L filled in the rotation side housing 15 is prevented from leaking to the outside, and the bearing 19, the planetary gear reduction mechanisms 24, 25, 26 and the like can be properly lubricated by the lubricating oil L. Therefore, the rotation side housing 15 can be smoothly rotated over a long period of time, and the reliability of the entire reduction gear 12 can be improved.

  In this case, according to the first embodiment, the elastic body 36 is fixed to the fixed body abutting portion 36 </ b> A that slidably contacts the bottom surface 34 </ b> A of the fixed body side accommodating space 34 and the bottom surface 35 </ b> A of the rotating body side accommodating space 35. The rotating body abutting portion 36B is integrally formed with a thin bent portion 36C having an inverted J shape. As a result, the spring force from the bent portion 36C that is in contact with the bottom surface 35A of the rotating body-side accommodation space 35 always acts on the elastic body 36 accommodated in the elastic body accommodation space 33. The contact portion 36A can be brought into close contact (sliding contact) with the bottom surface 34A of the fixed body side accommodation space 34, and the gap 22 can be more tightly closed by the elastic body 36.

  In addition, according to the first embodiment, the outer peripheral surface of the elastic body 36 has an outer diameter from the cylindrical surface 36D that engages with the fixed body-side accommodation space 34 and from the cylindrical surface 36D toward the rotating body contact portion 36B. It includes an inclined surface 36E that is inclined so that the dimensions are gradually reduced. Thus, by providing the inclined surface 36E on the outer peripheral surface of the elastic body 36, when the earth and sand M indicated by a two-dot chain line is accumulated in the elastic body accommodating space 33 as shown in FIG. M comes to press the inclined surface 36E of the elastic body 36 in the direction of arrow F. As a result, using the accumulated earth and sand M, the fixed body abutting portion 36A of the elastic body 36 can always be pressed against the bottom surface 34A of the fixed body side accommodation space 34, and the elastic body 36 closes the gap 22 more firmly. can do.

  Furthermore, according to the first embodiment, two long grooves 35D are provided on the bottom surface 35A of the rotating body-side accommodation space 35, and two hemispheres are spaced apart in the circumferential direction on the inner peripheral surface 36F of the elastic body 36. A concave recess 36G is provided, and a ball 37 as a locking member is fitted to the long groove 35D and the concave recess 36G, so that the elastic body 36 is prevented from rotating in the circumferential direction with respect to the rotary housing 15. can do. As a result, since the elastic body 36 rotates integrally with the rotation-side housing 15, the earth and sand accumulated in the elastic body accommodating space 33 is deposited and fixed almost uniformly in the circumferential direction of the elastic body 36, The inclined surface 36E is almost uniformly pressed over the entire circumference of the elastic body 36. As a result, the pressure acting on the inclined surface 36E of the elastic body 36 from the accumulated earth and sand can be avoided from being biased in the circumferential direction, and a uniform pressure is applied to the inclined surface 36E of the elastic body 36 over the entire circumference. can do.

  Moreover, the axial dimension A of the cylindrical surface 36D is set smaller than the axial dimension (depth dimension) B from the fixed body side end surface 13E to the bottom surface 34A of the fixed body side accommodation space 34. As a result, as shown in FIG. 3, the cylindrical surface 36D of the elastic body 36 can be stored in the fixed body-side accommodation space 34, and earth or sand that has entered the elastic body accommodation space 33 through the labyrinth 32 causes the inclined surface 36E. By providing, it will accumulate on the bottom face 35A side of the rotating body side accommodation space 35. Accordingly, the accumulated earth and sand push the inclined surface 36E and press the fixed body abutting portion 36A, so that the earth and sand slides between the fixed body abutting portion 36A of the elastic body 36 and the bottom surface 34A of the stationary body side accommodation space 34. It is possible to suppress direct intrusion into the network.

  Next, FIG. 7 shows a second embodiment of the present invention. The feature of the present embodiment is that the elastic body is directed to the fixed body by the inner peripheral projection provided on the inner peripheral surface of the elastic body. This is because a spring to be pressed is formed. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The elastic body 41 used in the second embodiment is provided in the elastic body accommodating space 33. The elastic body 41 is formed in a cylindrical shape using a resin material in substantially the same manner as the elastic body 36 according to the first embodiment, and a fixed body contact portion 41A that contacts the bottom surface 34A of the fixed body-side accommodation space 34, And a rotating body contact portion 41B that contacts the bottom surface 35A of the rotating body side accommodation space 35. In addition, a cylindrical surface 41C and an inclined surface 41D are provided on the outer peripheral surface of the elastic body 41, and two recessed portions 41F are provided on the inner peripheral surface 41E of the elastic body 41 at intervals of 180 degrees in the circumferential direction. Is provided. However, the elastic body 41 is different from the elastic body 36 in that an inner peripheral surface 41E is provided with an inner peripheral protrusion 41G described later.

  The inner peripheral projection 41G constitutes a spring that presses the elastic body 41 toward the fixed housing 13 in the axial direction, and is integrally formed on the inner peripheral surface 41E of the elastic body 41 over the entire circumference. . The inner peripheral side protrusion 41G is formed of a thin annular protrusion that is easily elastically deformed, and protrudes into the gap 22 between the fixed body side end face 13E and the rotating body side end face 15C. Here, the inner peripheral side of the inner peripheral side protruding portion 41G extends obliquely from the fixed body side end surface 13E toward the rotating body side end surface 15C, and the inner peripheral edge of the inner peripheral side protruding portion 41G is within the gap 22 within the rotating body side end surface 15C. Abut.

  The elastic body 41 used in the second embodiment has the above-described configuration, and there is no particular difference in basic operation from that according to the first embodiment.

However, according to the second embodiment, the spring force from the inner peripheral projection 41G that is in contact with the rotating body side end face 15C always acts on the elastic body 41 accommodated in the elastic body accommodating space 33. Therefore, the elastic body 41 can be pressed toward the stationary housing 13. As a result, the fixed body abutting portion 41 </ b> A of the elastic body 41 can always be brought into contact with the bottom surface 34 </ b> A of the fixed body side accommodation space 34, and the gap 22 can be more tightly closed by the elastic body 41.
Furthermore, when the earth and sand M shown with a dashed-two dotted line accumulates in the elastic body accommodation space 33, this accumulated earth and sand M presses the inclined surface 41D of the elastic body 41 in the arrow F direction. As a result, using the accumulated earth and sand M, the fixed body abutting portion 41A of the elastic body 41 can be pressed against the bottom surface 34A of the fixed body-side accommodation space 34, and the gap 22 is more tightly closed by the elastic body 41. be able to.

  Next, FIG. 8 shows a third embodiment of the present invention. The feature of this embodiment is that the elastic body is pressed toward the fixed body by an annular leaf spring made of a member different from the elastic body. The spring is formed. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The elastic body 42 used in the third embodiment is substantially the same as the elastic body 36 according to the first embodiment. The elastic body 42 is a fixed body abutting portion 42A that abuts the bottom surface 34A of the stationary body side accommodation space 34, and the rotating body side. A rotating body contact portion 42B that contacts the bottom surface 35A of the housing space 35. In addition, a cylindrical surface 42C and an inclined surface 42D are provided on the outer peripheral surface of the elastic body 42, and two concave portions 42F and an outside of a leaf spring 43 described later are provided on the inner peripheral surface 42E of the elastic body 42. An engagement step portion 42G with which the periphery is engaged is provided.

  The annular leaf spring 43 constitutes a spring that presses the elastic body 42 in the axial direction toward the stationary housing 13. The outer peripheral edge of the leaf spring 43 is locked to the engagement step portion 42G of the elastic body 42, and the inner peripheral edge of the leaf spring 43 is in contact with the rotating body side end face 15C in the gap 22. The spring that presses the elastic body 42 against the stationary housing 13 may be a wave spring or the like.

  The elastic body 42 used in the third embodiment has the configuration as described above, and there is no particular difference in basic operation from that according to the first embodiment.

  However, according to the third embodiment, the spring force from the leaf spring 43 in contact with the rotating body side end face 15C always acts on the elastic body 42 accommodated in the elastic body accommodating space 33. The body 42 can be pressed toward the stationary housing 13. As a result, the fixed body abutting portion 42 </ b> A of the elastic body 42 can always be brought into contact with the bottom surface 34 </ b> A of the stationary body side accommodation space 34, and the gap 22 can be more tightly closed by the elastic body 42.

  Next, FIG. 9 shows a fourth embodiment of the present invention. The feature of this embodiment is that the bottom surface of the rotating body side accommodation space is formed as a stepped bottom surface that projects stepwise toward the elastic body. There is. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The elastic body accommodating space 44 used in the fourth embodiment is substantially the same as the elastic body accommodating space 33 according to the first embodiment, and an annular fixed body side accommodating space 34 that is recessed in the fixed body side end face 13E. The rotor-side end surface 15C is formed with a later-described rotor-side housing space 45, and the elastic body 36 is housed therein.

  The rotor-side housing space 45 is formed as an annular groove centered on the rotation axis of the rotation-side housing 15, and is surrounded by a stepped bottom surface 45A, which will be described later, an inner diameter surface 45B, and an outer diameter surface 45C. On the inner diameter surface 45B, two long grooves 45D (only one is shown) with which the ball 37 is engaged are formed. However, the step-like bottom surface 45A of the rotor-side accommodation space 45 is formed as a step-like bottom surface projecting stepwise toward the inclined surface 36E of the elastic body 36, and thus the rotor-side accommodation according to the first embodiment. It is different from the space 35.

  The stepped bottom surface 45A of the rotor-side housing space 45 is formed such that the axial length (groove depth) from the rotor-side end surface 15C gradually decreases from the inner diameter surface 45B toward the outer diameter surface 45C. It continues in a staircase pattern along the 36 inclined surfaces 36E. As a result, the stepped bottom surface 45A approaches the inclined surface 36E of the elastic body 36, and the volume of the rotating body-side receiving space 45 is smaller than the volume of the rotating body-side receiving space 35 according to the first embodiment.

  The rotating body side accommodation space 45 used in the fourth embodiment has the above-described configuration, and the basic operation is not different from that of the first embodiment.

  However, according to the fourth embodiment, the bottom surface of the rotator-side accommodation space 45 is formed as a stepped bottom surface 45A that projects toward the inclined surface 36E of the elastic body 36, whereby the volume of the rotator-side accommodation space 45 is increased. Can be reduced. As a result, it is possible to reduce the amount of earth and sand that enters the rotating body-side accommodation space 45 through the labyrinth 32, and the elastic body 36 is attached to the fixed-side housing 13 using a small amount of earth and sand accumulated in the rotating body-side accommodation space 45. The fixed body abutting portion 36A of the elastic body 36 can be brought into closer contact with the bottom surface 34A of the stationary body-side accommodation space 34 by being pressed against the bottom surface 34A.

  Next, FIG. 10 shows a fifth embodiment of the present invention. The feature of this embodiment is that the bottom surface of the rotating body-side accommodation space is formed as an inclined bottom surface that projects obliquely along the inclined surface of the elastic body. It is to have done. In the fifth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The elastic body accommodation space 46 used in the fifth embodiment is substantially the same as the elastic body accommodation space 33 according to the first embodiment, and an annular fixed body side accommodation space 34 recessed in the fixed body side end face 13E. The rotor-side end space 15C is provided with a later-described rotor-side housing space 47, and the elastic body 36 is housed therein.

  The rotor-side housing space 47 is formed as an annular groove centered on the rotation axis of the rotation-side housing 15, and is surrounded by an inclined bottom surface 47A, an inner diameter surface 47B, and an outer diameter surface 47C, which will be described later, and has an inner diameter. On the surface 47B, two long grooves 47D (only one is shown) with which the ball 37 engages are formed. However, the inclined bottom surface 47A of the rotating body-side receiving space 45 is formed as an inclined bottom surface that protrudes obliquely along the inclined surface 36E of the elastic body 36, and thus the rotating body-side receiving space 35 according to the first embodiment. Are different.

  The inclined bottom surface 47A of the rotating body side accommodation space 47 extends substantially in parallel along the inclined surface 36E of the elastic body 36, and the inclined bottom surface 47A of the rotating body side accommodation space 47 and the inclined surface 36E of the elastic body 36 extend over the entire circumference. Facing each other with almost even spacing. As a result, the inclined bottom surface 47A approaches the inclined surface 36E of the elastic body 36, and the volume of the rotating body side accommodation space 47 is smaller than the volume of the rotating body side accommodation space 35 according to the first embodiment.

  The rotating body side accommodation space 47 used in the fifth embodiment has the above-described configuration, and there is no particular difference in basic operation from that according to the first embodiment.

  However, according to the fifth embodiment, the bottom surface of the rotating body side accommodation space 47 is formed as the inclined bottom surface 47A extending substantially in parallel with the inclined surface 36E of the elastic body 36, so The volume can be reduced. As a result, the amount of earth and sand entering the rotating body side accommodation space 47 through the labyrinth 32 can be reduced, and the elastic body 36 is fixed to the fixed side housing 13 using a small amount of earth and sand accumulated in the rotation body side accommodation space 47. Can be pressed against. Moreover, since the inclined bottom surface 47A of the rotating body side accommodation space 47 faces the inclined surface 36E of the elastic body 36 with a substantially uniform spacing, the pressure acting on the elastic body 36 from the earth and sand accumulated in the rotating body side accommodation space 47 Can be brought into closer contact with the bottom surface 34 </ b> A of the fixed body-side accommodation space 34.

  Next, FIG. 11 shows a sixth embodiment of the present invention. The feature of the present embodiment is that an annular plate is provided on the bottom surface of the fixed body-side accommodation space so that the fixed body contact portion of the elastic body contacts. There is. In the sixth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The annular plate 48 used in the sixth embodiment is provided in the stationary body side accommodation space 34 that constitutes the elastic body accommodation space 33. The annular plate 48 is formed in an annular shape that is substantially equal to the bottom surface 34 </ b> A of the fixed body-side accommodation space 34 using, for example, a metal material having wear resistance. The annular plate 48 constitutes a part of the fixed-side housing 13 by being fixed to the bottom surface 34A of the fixed-body-side accommodation space 34 using means such as adhesion. The fixed body abutting portion 36 </ b> A of the elastic body 36 accommodated in the elastic body accommodating space 33 is in contact with the abutting surface 48 </ b> A of the annular plate 48.

  The annular plate 48 used in the sixth embodiment has the above-described configuration. By fixing the wear-resistant annular plate 48 to the bottom surface 34A of the fixed body-side accommodation space 34, the annular plate 48 is The fixed body contact portion 36A of the elastic body 36 can be brought into contact with the contact surface 48A. As a result, the wear of the elastic body 36 is reduced, the amount of dimensional change in the axial direction with time is reduced, and the pressing force of the elastic body 36 is prevented from being lowered, whereby the sealing performance between the annular plate 48 and the bottom surface 34A. Can be maintained over a long period of time.

  Next, FIG. 12 shows a seventh embodiment of the present invention. The feature of this embodiment is that the fixed body abutting portion of the elastic body is moved from the outer peripheral side toward the inner peripheral side of the fixed body side accommodation space. The taper surface is formed so as to be gradually separated from the bottom surface in the axial direction. In the seventh embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The elastic body 49 used in the seventh embodiment is substantially the same as the elastic body 36 according to the first embodiment, and includes a fixed body contact portion 49A that contacts the bottom surface 34A of the fixed body side accommodation space 34, and a rotating body side. It has a rotating body abutting portion 49B that abuts against the bottom surface 35A of the accommodating space 35, and a bent portion 49C as a spring integrally formed with the rotating body abutting portion 49B. A cylindrical surface 49D and an inclined surface 49E are provided on the outer peripheral surface of the elastic body 49, and two recessed portions 49G are provided on the inner peripheral surface 49F of the elastic body 49. However, the elastic body 49 is different from the elastic body 36 in that a fixed body contact portion 49A is formed as a later-described tapered surface 49H.

  The surface of the fixed body contact portion 49A of the elastic body 49 that faces the bottom surface 34A of the fixed body side accommodation space 34 in the axial direction is axially extending from the bottom surface 34A of the fixed body side accommodation space 34 toward the inner circumference side from the outer peripheral side. It is formed as a tapered surface 49H that is gradually separated from each other. That is, in a state where the elastic body 49 is disposed in the elastic body accommodation space 33, the outer peripheral side of the fixed body abutting portion 49 </ b> A of the elastic body 49 abuts on the bottom surface 34 </ b> A of the fixed body side accommodation space 34 to fix the elastic body 49. The inner peripheral side of the body contact portion 49A is gradually separated from the bottom surface 34A of the fixed body-side accommodation space 34 in the axial direction. Thus, a space 50 having a triangular cross section is formed between the fixed body contact portion 49A and the bottom surface 34A.

  The elastic body 49 used in the seventh embodiment has the above-described configuration. By forming the fixed body abutting portion 49A of the elastic body 49 as a tapered surface 49H, the fixed body contact of the elastic body 49 is obtained. The outer peripheral side of the contact portion 49 </ b> A can be preferentially brought into contact with the bottom surface 34 </ b> A of the fixed body side accommodation space 34. As a result, the surface pressure of the fixed body contact portion 49A of the elastic body 49 pressed against the bottom surface 34A of the fixed body side accommodation space 34 can be increased, and the fixed body contact portion 49A and the bottom surface 34A of the fixed body side storage space 34 The sealing performance between the two can be improved.

  Next, FIG. 13 shows an eighth embodiment of the present invention. The feature of this embodiment is that a second gap is formed between the gap between the fixed body side end face and the rotating body side end face and the elastic body accommodation space. It is in having established a labyrinth. Note that in the eighth embodiment, identical symbols are assigned to components identical to those in the first embodiment described above, and descriptions thereof are omitted.

  The fixed-side housing 51 used in the eighth embodiment is similar to the fixed-side housing 13 according to the first embodiment in that it includes a flange portion (not shown), a housing support portion 51A, and a male spline portion ( (Not shown), a seal mounting part 51B, a fixed body side end face 51C, and a fixed body side recessed part 51D. However, on the inner peripheral side (floating seal 27 side) of the fixed body side end surface 51C, an annular inner diameter side recessed portion 51E constituting a second labyrinth 57 described later is formed.

  The rotation-side housing 52 includes a flange portion (not shown), a seal mounting portion 52A, a rotation-body-side end surface 52B, and a rotation-body-side protrusion 52C, in substantially the same manner as the rotation-side housing 15 according to the first embodiment. Have. However, on the inner peripheral side of the rotating body-side end surface 52B, a cylindrical inner-diameter-side protrusion 52D that protrudes toward the inner-diameter recessed portion 51E of the fixed-side housing 51 is formed. This inner diameter side protrusion 52D constitutes the second labyrinth 57 by facing the inner diameter side recessed part 51E of the fixed side housing 51 with a gap in the radial direction.

  A gap 22 is formed between the fixed body side end face 51C of the fixed side housing 51 and the rotary body side end face 52B of the rotary side housing 52. The gap 22 is formed radially outside the gap 22 and radially inside the labyrinth 32. An elastic body accommodating space 53 for accommodating the elastic body 36 is formed. The elastic body accommodation space 53 includes a stationary body side accommodation space 54 that is recessed in the stationary body side end face 51C, and a rotator side accommodation space 55 that is recessed in the rotator side end face 52B.

  The fixed body-side accommodation space 54 is formed as an annular groove centered on the rotation axis of the rotation-side housing 52, and is surrounded by a bottom surface 54A serving as a groove bottom, an inner diameter surface 54B, and an outer diameter surface 54C. The rotor-side housing space 55 is formed as an annular groove centered on the rotation axis of the rotation-side housing 52, and is surrounded by a bottom surface 55A serving as a groove bottom, an inner diameter surface 55B, and an outer diameter surface 55C. Are formed with two long grooves 55D (only one is shown) with which the ball 37 is engaged.

  An annular plate 56 formed in an annular shape using a metal material having wear resistance is fixed to the bottom surface 54 </ b> A of the stationary body side accommodation space 54 by means such as adhesion. The fixed body abutting portion 36A of the elastic body 36 accommodated in the elastic body accommodating space 53 is slidably in contact with the sliding contact surface 56A of the annular plate 56.

  The second labyrinth 57 is located on the inner side in the radial direction than the labyrinth 32, is provided between the elastic body accommodation space 53 and the gap 22, and communicates with the gap 22. Here, the second labyrinth 57 is formed between an annular inner diameter side recessed portion 51E formed on the fixed body side end surface 51C and a cylindrical inner diameter side protrusion 52D formed on the rotating body side end surface 52B. Yes. The second labyrinth 57 forms a crank-shaped labyrinth between the elastic body accommodating space 53 and the gap 22, and earth and sand that has passed through the elastic body 36 disposed in the elastic body accommodating space 53 passes through the gap 22. This is intended to suppress intrusion around the floating seal 27 easily.

  The eighth embodiment has the above-described configuration. By providing the second labyrinth 57 on the inner side in the radial direction than the labyrinth 32, the earth and sand that has entered the elastic body accommodating space 53 is elastic. Even if it passes through the body 36, the earth and sand can be captured by the second labyrinth 57. As a result, it is possible to suppress earth and sand from entering the periphery of the floating seal 27, and the sealing performance of the floating seal 27 can be maintained well over a long period of time.

  Next, FIGS. 14 and 15 show a ninth embodiment of the present invention, and in this embodiment, a lower guide roller of a hydraulic excavator is illustrated as a rotating device. Note that in the ninth embodiment, identical symbols are assigned to components identical to those in the first embodiment described above, and descriptions thereof are omitted.

  As shown in FIG. 1, a plurality of lower guide rollers 7 as rotating devices are provided side by side in the front and rear directions on the lower end side of the side frame 5 </ b> A. Each lower guide roller 7 guides the crawler belt 8 toward the traveling device 9 and the idler wheel 6. These lower guide rollers 7 include a shaft support member 58, a roller support shaft 59, a roller 60, a floating seal 27, an elastic body accommodating space 63, an elastic body 36, and the like, which will be described later.

  The shaft support member 58 as a fixed body is fixed to the lower end portion of the side frame 5A in a paired state in the left and right directions, and supports the roller support shaft 59. The shaft support member 58 is formed in a stepped cylindrical shape having a shaft insertion hole 58A. A cylindrical flange 58B is provided on the outer peripheral side of the shaft support member 58, and the inner peripheral side of the flange 58B is sealed. A mounting portion 58C is provided.

  The roller support shaft 59 is supported by each shaft support member 58 by inserting both end portions in the length direction into shaft insertion holes 58A of the pair of shaft support members 58, respectively. The roller support shaft 59 rotatably supports the roller 60 via a slide bearing 60E described later.

  The roller 60 as a rotating body is positioned between a pair of shaft support members 58 and is rotatably supported by a roller support shaft 59. The roller 60 is formed of a stepped cylindrical body in which a shaft insertion hole 60A is formed at the center, and large-diameter flange portions 60B are integrally formed on both end sides in the axial direction. On both ends of the roller 60, an annular seal mounting portion 60C and a bearing receiving hole 60D having a larger inner diameter than the seal mounting portion 60C are formed concentrically. Cylindrical plain bearings 60E are inserted into the shaft insertion holes 60A of the rollers 60 from both ends in the axial direction. An oil sump chamber 60F is provided at an intermediate portion of the shaft insertion hole 60A, and lubricating oil L for lubricating the slide bearing 60E is stored in the oil sump chamber 60F.

  A floating seal 27 is provided between the seal mounting portion 58 </ b> C of the shaft support member 58 and the seal mounting portion 60 </ b> C of the roller 60, and the lubricating oil L is sealed in the roller 60 by the floating seal 27.

  Between the fixed body side end face 58D that faces the roller 60 in the axial direction of the shaft support member 58 and the rotary body side end face 60G of the roller 60 that faces the shaft support member 58 in the axial direction, the shaft extends over the entire circumference. A directional gap 61 is formed. Further, a labyrinth 62 that is located radially outside the gap 61 and communicates with the gap 61 between the outer circumferential surface of the flange portion 58 </ b> B of the shaft support member 58 and the inner circumferential surface of the flange portion 60 </ b> B of the roller 60. Is formed.

  An elastic body accommodation space 63 is formed on the fixed body side end face 58D of the shaft support member 58 and the rotating body side end face 60G of the roller 60. The elastic body accommodation space 63 is outside the gap 61 in the radial direction and is a labyrinth. It is arranged on the inner side in the radial direction than 62. Here, the elastic body accommodation space 63 includes a stationary body side accommodation space 64 that is recessed in the stationary body side end face 58D, and a rotator side accommodation space 65 that is recessed in the rotator side end face 60G.

  The fixed body side accommodation space 64 is surrounded by a bottom surface 64A serving as a groove bottom, an inner diameter surface 64B, and an outer diameter surface 64C. The rotor-side accommodation space 65 is surrounded by a bottom surface 65A serving as a groove bottom, an inner diameter surface 65B, and an outer diameter surface 65C, and the inner diameter surface 65B has two long grooves 65D (only one) with which the ball 37 engages. (Shown) is formed.

  An elastic body 36 is disposed in the elastic body accommodation space 63, and a ball 37 is fitted in the long groove 65 </ b> D formed on the inner diameter surface 65 </ b> B of the rotating body side accommodation space 65 and the recessed portion 36 </ b> G of the elastic body 36. . As a result, the elastic body 36 covers the gap 61 from the outside in the radial direction in a state where the elastic body 36 is prevented from rotating with respect to the roller 60.

  The lower guide roller 7 according to the ninth embodiment has the above-described configuration, and even when the excavator 1 travels in a muddy area or the like, even if the earth or sand enters the labyrinth 62, The elastic body 36 can suppress entry into the periphery of the floating seal 27 through the gap 61. Thereby, the sealing performance of the floating seal 27 can be kept good for a long period of time, and the lubricating oil L filled in the roller 60 can be prevented from leaking to the outside. As a result, the slide bearing 60E and the like can be properly lubricated, so that the roller 60 can be smoothly rotated over a long period of time, and the reliability of each lower guide roller 7 can be improved.

  In the above-described embodiment, the case where the outer peripheral surface of the elastic body 36 is configured by the cylindrical surface 36D and the linear inclined surface 36E is illustrated. However, the present invention is not limited to this, and may be an elastic body 36 'having an inclined surface 36E' curved in an arc shape, for example, as in a modification shown in FIG.

  Further, in the embodiment, when two long grooves 35D, concave recesses 36G, and balls 37 for stopping the elastic body 36 with respect to the rotation side housing 15 are provided at intervals of 180 degrees in the circumferential direction. Is illustrated. However, the present invention is not limited to this, and for example, a configuration using three or more long grooves 35D, recessed portions 36G, and balls 37 may be used.

  Furthermore, in the embodiment, a case where the present invention is applied to the traveling device 9 of the excavator 1 and the lower guide roller 7 is illustrated as a rotation device of the construction machine. However, the present invention is not limited to this, and can be applied to, for example, the idler wheel 6 of the excavator 1.

2 Lower traveling body (car body)
13, 51 Fixed housing (fixed body)
13E, 51C, 58D Fixed body side end face 15, 52 Rotating side housing (Rotating body)
15C, 52C, 60G Rotating body side end face 22, 61 Clearance 27 Floating seal 32, 62 Labyrinth 33, 44, 46, 53, 63 Elastic body accommodating space 34, 54, 64 Fixed body side accommodating space 34A, 54A, 64A Bottom surface 35, 45 , 47, 55, 65 Rotor-side accommodation space 35A, 55A, 65A Bottom surface 35B, 45B, 47B, 55B, 65B Inner diameter surface 35D, 45D, 47D, 55D, 65D Long groove 36, 41, 42, 49, 36 'Elastic body 36A , 41A, 42A, 49A Fixed body abutting portions 36B, 41B, 42B, 49B Rotating body abutting portions 36D, 41C, 42C, 49D Cylindrical surfaces 36E, 41D, 42D, 49E, 36E ′ Inclined surfaces 36F, 41E, 42E, 49F Inner peripheral surface 36G, 41F, 42F, 49G Recessed part 37 Ball (rotating part Material)
41G Inner peripheral projection (spring)
43 Leaf spring (spring)
45A Stepped bottom surface 47A Inclined bottom surface 48, 56 Annular plate 49H Tapered surface 58 Shaft support member (fixed body)
60 Roller (Rotating body)

Claims (9)

A fixed body fixed to a vehicle body of a construction machine, a rotating body provided rotatably with respect to the fixed body, and a fixed body side end surface of the fixed body facing the axial direction and a rotating body side end surface of the rotating body A floating seal that is located between the fixed body and the rotating body and is located radially inside of the gap, and that is radially outside of the gap. In the rotating device of the construction machine, which is provided between the fixed body and the rotating body and is provided with a labyrinth communicating with the gap,
An elastic body accommodating space that is provided on the stationary body side end surface and the rotating body side end surface that is located radially outside of the gap and radially inside of the labyrinth, and has a larger axial dimension than the gap. ,
An annular elastic body that is provided in the elastic body accommodating space and covers the gap from the outside in the radial direction in a state of being stopped with respect to the rotating body;
A spring that presses the elastic body in the axial direction toward the fixed body,
A rotating device for a construction machine, wherein an outer peripheral surface of the elastic body is provided with an inclined surface whose outer diameter dimension gradually decreases from the fixed body toward the rotating body. A long groove extending in the axial direction from the end surface on the rotating body side is provided on the inner diameter surface of the rotating body on which the inner peripheral surface of the elastic body abuts in the elastic body housing space,
On the inner peripheral surface of the elastic body, a recessed portion is provided at a position facing the inner portion of the long groove,
The rotation device for a construction machine according to claim 1, wherein a rotation-stopping member that fits into the long groove and the recess is provided to stop rotation of the elastic body with respect to the rotation body. The elastic body housing space is constituted by a fixed body side housing space recessed in the stationary body side end surface and a rotating body side housing space recessed in the rotating body side end surface,
The elastic body has a fixed body contact portion that slidably contacts the bottom surface of the fixed body side storage space, and a rotating body contact portion that contacts the bottom surface of the rotary body side storage space,
2. The rotation device for a construction machine according to claim 1, wherein the spring is formed by a bent portion that is provided integrally with the rotating body contact portion of the elastic body and is bent so as to expand and contract in the axial direction. The outer peripheral surface of the elastic body includes a cylindrical surface that is slidably engaged with the fixed body-side accommodation space, and the inclined surface that gradually decreases in outer diameter from the cylindrical surface toward the rotating body contact portion. Have
The rotating device for a construction machine according to claim 3, wherein an axial dimension of the cylindrical surface is smaller than an axial dimension from the end face on the fixed body side to the bottom surface of the receiving space on the fixed body side.   The spring is formed by an inner peripheral projection that is provided integrally with the inner peripheral surface of the elastic body and presses the elastic body toward the fixed body by contacting the end surface of the rotating body in the gap. The rotating device for construction equipment according to claim 1.   The spring is formed of a member different from the elastic body, and is provided between the rotating body side end surface and the inner peripheral surface of the elastic body in the gap, and presses the elastic body toward the fixed body. The rotation device for a construction machine according to claim 1, wherein the rotation device is formed by a plate spring.   The bottom surface of the rotating body side accommodation space is inclined stepwise along the inclined surface of the elastic body or the stepped bottom surface that reduces the volume of the rotating body side accommodation space by projecting toward the elastic body. The rotating device for a construction machine according to claim 3, wherein the rotating device is formed as an inclined bottom surface that reduces the volume of the rotating body-side accommodation space.   The rotation of the construction machine according to claim 3, wherein an annular plate that has wear resistance and is slidably contacted with the fixed body contact portion of the elastic body is fixed to a bottom surface of the fixed body side accommodation space. apparatus.   The construction according to claim 3, wherein the fixed body abutting portion of the elastic body is formed as a tapered surface that gradually separates in the axial direction from the bottom surface of the fixed body side accommodation space from the outer peripheral side toward the inner peripheral side. Rotating device of the machine.

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