JP2010221775A - Power transmission device for hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device for a hybrid vehicle suitable for an FF vehicle, which can reduce a total length of the device by increasing a diameter of a motor and ensuring a space to arrange a large-diameter control element inside the inner perimeter. <P>SOLUTION: An internal combustion engine and the motor 3 serving as driving sources and a transmission that shifts a rotational driving force output from at least one of the internal combustion engine and the motor 3 are arranged on a same shaft line CL, and each housing (motor housing 39 and the like) of the internal combustion engine, the motor 3 and the transmission is integrally connected to one another with a fastening member 7 in the power transmission device for the hybrid vehicle, wherein at least one fastening member 7 is arranged within the outer diameter of a stator 37 forming the motor 3, and a rotor 31 forming the motor 3 is arranged on the inner perimeter side of the stator 35. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission device for a hybrid vehicle equipped with an internal combustion engine and a motor as a power source, and more particularly to a power transmission device in which an internal combustion engine, a motor, and a transmission are arranged on the same axis.

  Hybrid vehicles that are equipped with an internal combustion engine and a motor that serves as a generator as a drive source, and that improve the fuel efficiency, high output, and environmental protection by taking advantage of their respective advantages have been put into practical use. Examples of this type of hybrid vehicle are disclosed in Patent Document 1 and Patent Document 2. Patent Document 1 discloses a hybrid vehicle having a power transmission device in which not only the engine, the motor, and the transmission but also the clutch are arranged on the same axis. Two examples of the position of the clutch are shown between the engine and the motor and between the motor and the transmission.

  Patent Document 2 includes a hybrid including an engine, a motor, and a transmission, provided with a fixed portion on the input shaft of the transmission, a motor rotor fixed on the outer peripheral side of the fixed portion, and a clutch mechanism disposed on the inner peripheral side. A vehicle drive device is disclosed. As the clutch mechanism, a so-called multi-plate friction clutch having a plurality of friction engagement elements is shown.

JP 2006-280049 A JP 2006-15597 A

  By the way, in the hybrid vehicle of Patent Document 1, the engine, the motor, the clutch, and the transmission are vertically arranged in a line in order in the vehicle length direction, and the total length of the power transmission device in the axial direction is large. Therefore, it is suitable for an FR vehicle (front engine / rear drive vehicle) in which the constraint on the overall length of the power transmission device is loose. However, in the FF vehicle (front engine / front drive vehicle), since a severe restriction condition that the power transmission device is arranged within the vehicle width occurs, it is difficult to mount the vehicle in the vertical arrangement of Patent Document 1. As a countermeasure, a structure in which the engine and the electric motor are arranged in two parallel axes and the outputs of both are joined by a gear mechanism is conceivable. According to this structure, the overall length of the power transmission device can be shortened to the vehicle width or less, but it is not preferable in terms of generation of power transmission loss due to the gear mechanism and cost increase due to an increase in the number of parts.

  Further, in the hybrid vehicle drive device of Patent Document 2, the overall length of the device is shortened by arranging the multi-plate friction clutch and the motor inside and outside the same axis. The multi-plate friction clutch is generally a wet type in which the switching operation is performed while supplying lubricating oil for cooling and lubrication, and the structure and operation control method are complicated and maintenance is troublesome. Needs arise. However, since the dry clutch has a larger diameter than the multi-plate friction clutch, it cannot be disposed on the inner peripheral side of the motor as in Patent Document 2, and is disposed between the engine and the motor. The overall length becomes longer.

  The present invention has been made in view of the above background, and it is possible to shorten the overall length of the apparatus by securing a space where the diameter of the motor can be made larger than before and a large-diameter power control element can be arranged on the inner peripheral side thereof. It is an object of the present invention to provide a hybrid vehicle power transmission device suitable for an FF vehicle.

  A hybrid vehicle power transmission device according to the present invention includes an internal combustion engine and a motor, which are drive sources, and a transmission that shifts the rotational driving force output from at least one of the internal combustion engine and the motor on the same axis. And a power transmission device for a hybrid vehicle in which housings of the internal combustion engine, the motor, and the transmission are integrally connected by a fastening member, wherein at least one of the stators is formed within an outer diameter of a stator constituting the motor. A fastening member is arranged, and a rotor constituting the motor is arranged on the inner peripheral side of the stator.

  Further, it is preferable that the fastening member is disposed on a cylindrical surface having a diameter smaller than the outer diameter of the stator and centering on the axis so as to avoid the stator coil.

  The stator coil may be a plurality of concentrated winding stator coils arranged at equal intervals in the circumferential direction.

  Alternatively, the stator coil may be a plurality of concentrated winding stator coils arranged rotationally symmetrical in the circumferential direction.

  In the hybrid vehicle power transmission device of the present invention, the internal combustion engine, the motor, and the transmission are arranged on the same axis, and the respective housings are integrally connected by the fastening member, and the stator constituting the motor is externally connected. At least one fastening member is disposed in the diameter. That is, the stator and the fastening member are overlapped. On the other hand, conventionally, the stator is disposed on the inner peripheral side and the fastening member is disposed on the outer peripheral side. Therefore, according to the present invention, the diameter of the stator can be made larger than that of the conventional case by the amount of overlap. Furthermore, the rotor on the inner peripheral side of the stator can be enlarged in diameter, and a wider space is provided on the inner peripheral side of the rotor, and a power control element having a larger diameter than conventional ones, such as a dry clutch, is provided. Can do. Thereby, it becomes possible to shorten the apparatus full length of an axial direction, and the power transmission apparatus for hybrid vehicles suitable for FF vehicle can be implement | achieved.

  Further, the housings of the internal combustion engine, the motor, and the transmission are often formed in a cylindrical shape, and a fastening member that connects the housings can be disposed on the cylindrical surface. Further, the stator coils on the stator are also generally arranged in a cylindrical shape in the circumferential direction. Here, the diameter of the cylindrical surface on which the fastening member is disposed can be made smaller than the outer diameter of the stator, and the fastening member can be disposed in the gap between the adjacent stator coils. And the coil can be arrange | positioned at equal intervals in the circumferential direction by making the space | interval between coils wider than a fastening member. Further, by disposing the fastening member at a specific location among the coils, the coils can be arranged in a rotationally symmetric manner although they are not equally spaced. An example of the coil is a concentrated winding stator coil.

  In this manner, the concentrated winding stator coils are arranged at equal intervals or rotationally symmetric, so that a good rotating magnetic field that smoothly changes on the stator side is formed. The diameter and inner diameter can be increased. In addition, since the concentrated winding stator coil has few crossover wirings for electrically connecting the coils, it is easy to dispose a fastening member between the coils.

  Note that the large-diameter power control element disposed on the inner peripheral side of the rotor is not limited to the dry clutch, and may be disposed by inserting a part of the transmission or other devices. The overall length can be shortened.

It is side surface sectional drawing explaining the power transmission device for hybrid vehicles of embodiment of this invention. It is sectional drawing of the motor seen from the AA arrow direction of embodiment of FIG. It is side surface sectional drawing explaining the conventional power transmission device for hybrid vehicles. It is sectional drawing of the motor of another embodiment seen from the same direction as FIG.

  A mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a side cross-sectional view illustrating a hybrid vehicle power transmission device according to an embodiment of the present invention. The power transmission device 1 according to the embodiment is configured by arranging the engine, the motor 3, and the transmission on the same axis CL, and transmits the rotational driving force output from at least one of the engine and the motor 3 to the transmission. To do. An unillustrated engine arranged on the left side in the figure outputs a rotational driving force to the engine output shaft 21.

  The motor 3 includes a rotor 31, a stator 35, a motor housing 39, and the like. The rotatable rotor 31 is formed by integrating an axial core portion 32 and a surrounding electromagnetic portion 33. The left side of the center-side shaft core portion 32 is directly connected to the engine output shaft 21 by bolts. The surrounding electromagnetic portion 33 provided on the outer peripheral side of the shaft core portion 32 is a magnetic body formed in a cylindrical shape and embedded with permanent magnets, and constitutes a rotating magnet type motor. The surrounding electromagnetic unit 33 may be an armature coil to constitute a rotary armature motor. A stator 35 is disposed outside the surrounding electromagnetic unit 33, and a motor housing 39 for fixing the stator 35 is disposed outside the stator 35.

  As shown in FIG. 1, the motor housing 39 has a substantially cylindrical shape, and is provided with a stepped portion 391 having an enlarged diameter on the left side in the drawing and a fastening hole 392 that penetrates the stepped portion 391 near the center in the axial direction. The left end 393 of the motor housing 39 is in contact with the engine housing 29. On the engine housing 29, a screw hole 291 having a female screw is formed at a position on the extension line of the fastening hole 392. Then, a long fastening bolt 7 having a male screw at the tip is inserted from the fastening hole 392 of the motor housing 39, passes through the inside of the motor housing 39, reaches the screwing hole 291 of the engine housing 29, and is screwed together. The housings 29 and 39 are integrally connected.

  FIG. 2 is a cross-sectional view of the motor 3 as seen from the direction of arrows AA in FIG. As shown in the drawing, a total of six fastening bolts 7 are arranged at equal intervals on a cylindrical surface centered on the axis CL.

  On the other hand, the stator 35 is directly fixed to the inner peripheral surface of the motor housing 39. Therefore, the diameter of the cylindrical surface on which the fastening bolt 7 is disposed is smaller than the outer diameter of the stator 35, and the fastening bolt 7 overlaps the stator 35. Specifically, as shown in the figure, a total of 24 stator coils 36 are arranged at equal intervals on the same cylindrical surface as the fastening bolt 7. Each stator coil 36 is of a concentrated winding type, and the number of crossover wirings connecting the coils is minimized, and wiring is performed avoiding the fastening bolts 7.

  Returning to FIG. 1, the right side of the shaft core portion 32 of the rotor 31 is fastened to the flywheel 4 with bolts, and the three of the engine output shaft 21, the rotor 31, and the flywheel 4 rotate integrally. Yes. A clutch mechanism 5 is disposed on the right side of the flywheel 4 in the drawing. More specifically, a clutch plate 51 is disposed on the annular surface on the right side of the flywheel 4 so as to be capable of frictional engagement, and a pressure plate 52 and a clutch release 53 are disposed to drive the clutch plate 51. The output side of the clutch mechanism 5 is coupled to a transmission input shaft 61 of a transmission (not shown) arranged on the left side in the drawing so that the rotational driving force can be output in an intermittent manner.

  Next, the effect of the hybrid vehicle power transmission device 1 of the embodiment configured as described above will be described in comparison with the conventional configuration shown in FIG. FIG. 3 is a side sectional view for explaining a conventional hybrid vehicle power transmission device 9. In the conventional device 9, a step 391 and a fastening hole 392 are provided in the vicinity of the left end 393 of the motor housing 39, and the fastening hole 392 faces the screwing hole 291 of the engine housing 29. The fastening bolt 70 inserted from the fastening hole 392 is immediately fitted into and screwed into the screwing hole 291 without passing through the inside of the motor housing 39. And the stator 350 which comprises the motor 3 is arrange | positioned rather than the fastening bolt 70 at the inner peripheral side.

  As apparent from a comparison of FIG. 1 with FIG. 3, according to the present embodiment, the stator 35 can be made larger in diameter than the conventional one, and correspondingly, the outer diameter D1 of the rotor 31 and the surrounding electromagnetic part 33. The inner diameter D2 can be made larger than the conventional dimensions (D3, D4), and a wide space S can be secured on the inner peripheral side of the surrounding electromagnetic part 33. In the embodiment of FIG. 1, nothing is arranged in the space S in order to make it easier to see the comparison with the conventional configuration of FIG. 3, but the power control elements are rearranged as appropriate to utilize the space S. If designed, the overall length of the apparatus in the direction of the axis CL can be shortened.

  Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of a motor 30 of another embodiment viewed from the same direction as FIG. As shown in the drawing, a total of six fastening bolts 7 are arranged at equiangular intervals on a cylindrical surface centered on the axis CL. On the other hand, in the stator 35, a total of 18 stator coils 360 are disposed on the same cylindrical surface as the fastening bolt 7. As shown in the figure, the interval between the stator coils 360 is wide at the places where the fastening bolts 7 are disposed, and is narrow otherwise. Therefore, the arrangement of the stator coils 360 is not equally spaced over the entire circumference, but rotational symmetry is maintained. Therefore, by controlling the voltage waveform applied to each stator coil 360, a good rotating magnetic field can be formed, and the performance of the motor 30 is ensured. Further, the diameter of the motor 30 can be made larger than that of the conventional one, as in the embodiment shown in FIGS.

1: Power transmission device according to an embodiment of the present invention 21: Engine output shaft 29: Engine housing 3, 30: Motor
31: Rotor 32: Shaft core part 33: Ambient electromagnetic part
35: Stator 36, 360: Stator coil
39: Motor housing 4: Flywheel 5: Clutch mechanism 61: Transmission input shaft 7, 70: Fastening bolt 9: Conventional power transmission device for hybrid vehicle CL: Axis S: Space

Claims (4)

An internal combustion engine and a motor, which are drive sources, and a transmission for shifting the rotational driving force output from at least one of the internal combustion engine and the motor are arranged on the same axis, and the internal combustion engine, the motor and the speed change A power transmission device for a hybrid vehicle in which each housing of the machine is integrally connected by a fastening member,
A hybrid vehicle power transmission device, wherein at least one fastening member is disposed within an outer diameter of a stator constituting the motor, and a rotor constituting the motor is disposed on an inner peripheral side of the stator.   2. The power transmission device for a hybrid vehicle according to claim 1, wherein the fastening member is disposed on a cylindrical surface having a diameter smaller than the outer diameter of the stator and centering on the axis so as to avoid the stator coil.   The hybrid vehicle power transmission device according to claim 2, wherein the stator coil is a plurality of concentrated winding stator coils arranged at equal intervals in the circumferential direction.   3. The power transmission device for a hybrid vehicle according to claim 2, wherein the stator coil is a plurality of concentrated winding stator coils arranged rotationally symmetrical in the circumferential direction.

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