JP2013129311A - Motor drive force transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive force transmission device which is made small in a device radial direction, by reducing a radial direction dimension of a device body.SOLUTION: The motor drive force transmission device 1 includes: electric motors 3 and 4 for generating motor driving force for operating a rear differential 107; and a deceleration transmission mechanism 2 for transmitting the motor drive force to the rear differential 107 by decelerating the motor driving force of the electric motors 3 and 4. The deceleration transmission mechanism 2 includes deflection cams 6 and 7 which rotate by a drive of the electric motors 3 and 4, and transmission members 8 and 9 which rotate by a rotation of the deflection cams 6 and 7, and it is arranged around an outer circumference of the rear differential 107.

Description

  The present invention relates to a motor driving force transmission device suitable for use in, for example, an electric vehicle having an electric motor as a driving source.

  A conventional motor driving force transmission device includes an electric motor that generates a motor driving force, and a deceleration transmission mechanism that transmits the motor driving force of the electric motor to a differential mechanism, and is mounted on an automobile (for example, Patent Document 1).

  The electric motor has an output shaft that is rotated by the power of the in-vehicle battery, and is disposed on the axis of the deceleration transmission mechanism.

  The deceleration transmission mechanism has a pair of deceleration transmission parts around its axis, is disposed on the side of the differential mechanism, and is connected to the electric motor and the differential mechanism (difference case). One deceleration transmission portion is connected to the output shaft of the electric motor, and the other deceleration transmission portion is connected to the differential case side.

  With the above configuration, the output shaft of the electric motor is rotated by the power of the on-vehicle battery, and accordingly, the motor driving force is transmitted from the electric motor to the differential mechanism via the deceleration transmission mechanism, and the left and right wheels are transmitted from this differential mechanism. To be distributed.

JP 2007-218407 A

  However, according to the motor driving force transmission device disclosed in Patent Document 1, the speed reduction transmission mechanism is disposed on an axis parallel to the axis of the differential mechanism. As a result, there is a problem in that the radial dimension of the apparatus main body is increased and the entire apparatus is increased in size.

  Accordingly, an object of the present invention is to provide a motor driving force transmission device that can shorten the radial dimension of the apparatus main body and can be downsized in the apparatus radial direction.

  In order to achieve the above object, the present invention provides motor drive force transmission devices (1) to (9).

(1) An electric motor that generates a motor driving force for operating the differential mechanism, and a deceleration transmission mechanism that decelerates the motor driving force of the electric motor and transmits the motor driving force to the differential mechanism. The mechanism includes an eccentric cam that rotates by driving of the electric motor, and a transmission member that rotates by rotation of the eccentric cam, and is disposed on the outer periphery of the differential mechanism.

(2) In the motor driving force transmission device described in (1) above, the electric motor is disposed on the outer periphery of the differential mechanism.

(3) In the motor driving force transmission device according to (1) or (2), the electric motor includes a stator fixed to the device main body and a rotor that rotates around the outer periphery of the stator.

(4) In the motor driving force transmission device according to any one of (1) to (3), the electric motor includes a first electric motor that generates a first motor driving force, and the first motor. A second electric motor connected to the electric motor to generate a second motor driving force, and the first electric motor and the second electric motor are connected to the differential mechanism via the deceleration transmission mechanism. Are connected to each other.

(5) In the motor driving force transmission device according to (4), the deceleration transmission mechanism is configured such that the eccentric cam is driven by at least one electric motor of the first electric motor and the second electric motor. The transmission member includes a plurality of eccentric cams that rotate, and the transmission member includes a plurality of transmission members that rotate by rotation of the plurality of eccentric cams.

(6) In the motor driving force transmission device according to (5), the deceleration transmission mechanism is disposed at a portion where the plurality of transmission members are separated from the differential mechanism at equal intervals around the rotation axis. Yes.

(7) In the motor driving force transmission device according to any one of (1) to (6), the reduction transmission mechanism includes a plurality of transmission members connected to input members of the differential mechanism via external gears. It consists of an internal gear that meshes.

(8) In the motor driving force transmission device according to any one of (1) to (7), the deceleration transmission mechanism is an outer peripheral portion of an input member in the differential mechanism, and is larger than a maximum outer diameter thereof. The plurality of eccentric cams are arranged on the outer periphery of a portion having a small outer diameter.

(9) In the motor driving force transmission device according to (8), the deceleration transmission mechanism includes a first eccentric cam in which the plurality of eccentric cams are located on one axial side of the axial center of the input member. , And a second eccentric cam located on the other axial side of the central portion in the axial direction of the input member, wherein the first eccentric cam and the second eccentric cam are arranged in parallel in the axial direction of the input member. Has been placed.

  According to the present invention, the radial dimension of the apparatus main body can be shortened, and the apparatus can be downsized in the radial direction.

The top view shown in order to demonstrate the outline of the vehicle carrying the motor driving force transmission apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing shown in order to demonstrate the motor drive force transmission apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the deceleration transmission mechanism of the motor drive force transmission apparatus which concerns on the 1st Embodiment of this invention (AA sectional drawing of FIG. 2). Sectional drawing which shows the operation state of the deceleration transmission mechanism in the motor drive force transmission apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing shown in order to demonstrate the electric motor of the motor drive force transmission apparatus which concerns on the 1st Embodiment of this invention. The block diagram shown in order to demonstrate the motor drive force transmission apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the deceleration transmission mechanism of the motor drive force transmission apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the operation state of the deceleration transmission mechanism in the motor drive force transmission apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing shown in order to demonstrate the motor drive force transmission apparatus which concerns on the 3rd Embodiment of this invention. Sectional drawing shown in order to demonstrate the motor drive force transmission apparatus which concerns on the 4th Embodiment of this invention.

[First embodiment]
Hereinafter, a motor driving force transmission device according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 schematically shows a four-wheel drive vehicle. As shown in FIG. 1, a four-wheel drive vehicle 101 uses a front-wheel-side power system with a drive source as an engine and a rear-wheel-side power system with a drive source as an electric motor. , An engine 102, a transaxle 103, a pair of front wheels 104, and a pair of rear wheels 105.

  The motor driving force transmission device 1 is disposed in a power system on the rear wheel side of the four-wheel drive vehicle 101 and is arranged on the vehicle body (not shown) of the four-wheel drive vehicle 101 via a differential carrier (device main body) 106. 107 is supported.

  The motor driving force transmission device 1 is configured to transmit a motor driving force of an electric motor (described later) to the pair of rear wheels 105. As a result, the motor driving force of the electric motor is output to the rear axle shaft 108 via the motor driving force transmission device 1 and the rear differential 107, and the pair of rear wheels 105 are driven. Details of the motor driving force transmission device 1 and the like will be described later.

  The engine 102 is disposed in the power system on the front wheel side of the four-wheel drive vehicle 101. As a result, the driving force of the engine 102 is output to the front axle shaft 109 via the transaxle 103, and the pair of front wheels 104 are driven.

(Overall configuration of motor driving force transmission device 1)
FIG. 2 shows the entire motor driving force transmission device. As shown in FIG. 2, the motor driving force transmission device 1 applies at least one of the first motor driving force a and the second motor driving force b (both shown in FIG. 6) to the rear differential 107. A deceleration transmission mechanism 2 that transmits the motor at a reduced speed, a first electric motor 3 that generates a first motor driving force a, a second electric motor 4 that generates a second motor driving force b, a first The vehicle is generally composed of an ECU (Electronic Control Unit) 5 for a vehicle as a control unit that outputs a control signal for controlling the electric motor 3 and the second electric motor 4.

  The rear differential 107 is a bevel gear type differential mechanism having a differential case (input member) 110, a pinion gear shaft 111, a pair of pinion gears 112, and a pair of side gears 113, and is housed in a differential carrier 106.

  As a result, the rotational force of the differential case 110 is distributed from the pinion gear shaft 111 to the side gear 113 via the pinion gear 112 and further transmitted from the rear axle shaft 108 to the left and right rear wheels 105.

  On the other hand, when a driving resistance difference occurs between the left and right rear wheels 105, the rotational force of the differential case 110 is differentially distributed to the left and right rear wheels 105 by the rotation of the pinion gear 112.

  The differential case 110 has an accommodation space 110 a and a shaft insertion hole 110 b inside, and is rotatably disposed in the differential carrier 106 via a tapered roller bearing 114. The differential case 110 is configured to receive at least one of the first motor driving force a and the second motor driving force b and rotate around the rotation axis O. The differential case 110 is attached with an involute external gear 110c having a rotation axis O as a gear axis.

  The pinion gear shaft 111 is disposed on the axis L perpendicular to the rotation axis O in the accommodation space 110a of the differential case 110, and the rotation about the axis L is restricted.

  The pair of pinion gears 112 is rotatably supported by the pinion gear shaft 111 and is housed in the housing space 110 a of the differential case 110.

  The pair of side gears 113 is housed in the housing space 110a of the differential case 110, and is connected to the rear axle shaft 108 through the shaft insertion hole 110b by spline fitting. The pair of side gears 113 are configured so that their gear shafts are orthogonal to the gear shafts of the pair of pinion gears 112 and mesh with the pair of pinion gears 112.

(Configuration of deceleration transmission mechanism 2)
3 and 4 show a deceleration transmission mechanism. As shown in FIGS. 3 and 4, the speed reduction transmission mechanism 2 includes a pair of rotating motors driven by at least one of the first electric motor 3 and the second electric motor 4 (both shown in FIG. 2). It has eccentric cams 6, 7 and a pair of transmission members 8, 9 that swing by rotation of the pair of eccentric cams 6, 7, and the first electric motor 3 on the rotation axis O (shown in FIG. 2) Arranged between the second electric motor 4 and the outer periphery of the rear differential 107.

  The pair of eccentric cams 6 and 7 are arranged in parallel with each other on the rotation axis O, and are attached to the inner peripheral surface of the second connecting member (connecting cylinder) 10.

One eccentric cam 6 has a through hole 6a centered on a point (axis line) O ₁ that is eccentric with an amount of eccentricity δ ₁ (δ ₁ = δ) rather than the center (point on the rotation axis O). 1 is arranged on the electric motor 3 side. The one eccentric cam 6 receives at least one of the first motor driving force a and the second motor driving force b, and causes the transmission member 8 to perform a circular motion with an eccentricity δ. It is configured as follows. When the eccentric cam 6 is rotated in the circumferential direction of the one direction (arrow m ₁ direction), the transmission member 8 is swung to its axis O ₁ is moved in the arrow n ₁ direction around a rotational axis O. Other direction of the eccentric cam 6 is circumferentially rotates (arrow m ₂ direction), the transmission member 8 (opposite to the direction of the arrow n ₁ direction) the axis O ₁ arrow n ₂ direction about the rotation axis O Swing to move to. The transmission member 8 is centered on the rotation axis O, moves the axis O ₁ along the circumferential direction of a circle having a radius of eccentricity δ, and makes one rotation with respect to the differential carrier (device main body) 106. Revolve without rotating.

The other eccentric cam 7 has a through hole 7a centered on a point (axis line) O ₂ that is eccentric with an amount of eccentricity δ ₂ (δ ₂ = δ) rather than the center (point on the rotation axis O). 2 on the side of the electric motor 4. The other eccentric cam 7 receives at least one of the first motor driving force a and the second motor driving force b, and causes the transmission member 9 to perform a circular motion with an eccentricity δ. It is configured as follows. When the eccentric cam 7 is rotated in the circumferential direction of the one direction (arrow m ₁ direction), the transmission member 9 swings so that its axis O ₂ is moved in the arrow n ₁ direction around a rotational axis O. Other direction of the eccentric cam 7 is circumferentially rotates (arrow m ₂ direction), the transmission member 9 (direction opposite to the arrow n ₁ direction) the axis O ₂ by the arrow n ₂ direction about the rotation axis O Swing to move to. The transmission member 9 is centered on the rotation axis O, moves the axis O ₂ along the circumferential direction of a circle having a radius of eccentricity δ, and makes one rotation with respect to the differential carrier (device main body) 106. Revolve without rotating.

The one of the eccentric cam 6 and the other of the eccentric cam 7, equal to the distance to the rotation axis O from a point O ₁ of the center of the through hole 6a from the point O ₂ of the center of the distance between the through-hole 7a to the rotation axis O The second connecting member (connecting cylinder) 10 is mounted on the inner peripheral surface of the second connecting member 10 so that the distances around the rotation axis O between the points O ₁ and O ₂ are equal.

The pair of transmission members 8 and 9 are internal gears that mesh with the external gear 110c of the differential case 110, are arranged along the rotation axis O, and are arranged around the rotation axis (rotation axis O) on the external gear 110c. It arrange | positions in the site | part spaced apart at equal intervals (180 degrees). As a result, the reduction transmission mechanism 2 and the rear differential 107 are connected in a well-balanced state. As the pair of transmission members 8 and 9, the external gear 110c has the number of teeth Z ₂ (for example, Z ₂ = 211) larger than the number of teeth Z ₁ (for example, Z ₁ = 198) of the external gear 110c and has an involute tooth profile. An involute toothed internal gear that always meshes with 110c is used. The speed reduction ratio of the speed reduction transmission mechanism 2 is calculated by (Z ₂ −Z ₁ ) / Z ₂ .

  One transmission member 8 is rotatably disposed on the inner surface of the through hole 6 a in one eccentric cam 6 via a needle roller bearing 12. A plurality of first connection members (connection pins) 11 are inserted into one transmission member 8, and a plurality of pins having a hole diameter larger than the dimension obtained by adding an eccentric amount δ to the pin diameter of each connection pin 11. The insertion holes 8a are arranged at equal intervals in the circumferential direction.

  The other transmission member 9 is rotatably disposed on the inner surface of the through hole 7 a in the other eccentric cam 7 via a needle roller bearing 12. Similarly to the one transmission member 8, a plurality of connection pins 11 are inserted into the other transmission member 9, and a plurality of holes having a diameter larger than the dimension obtained by adding the eccentric amount δ to the pin diameter of each connection pin 11. The pin insertion holes 9a are arranged at equal intervals in the circumferential direction.

(Configuration of the first electric motor 3)
FIG. 5 shows an electric motor. FIG. 6 shows a control system of the deceleration transmission mechanism. As shown in FIGS. 5 and 6, the first electric motor 3 has a stator 3a and a rotor 3b, and is connected to the rear differential 107 via the speed reduction transmission mechanism 2 on the rotation axis O (shown in FIG. 2). The stator 3a is connected to the ECU 5. The first electric motor 3 generates a first motor driving force a for operating the rear differential 107 when the stator 3a receives a control signal from the ECU 5 and rotates the rotor 3b. It is configured to let you.

  The stator 3a has a stator core 30a and a coil 31a, is disposed on the inner peripheral side of the first electric motor 3, and is fixed to a differential carrier 106 (shown in FIG. 2).

  The stator core 30a is formed by laminating a plurality of silicon steel plates, for example, and is entirely formed of a cylindrical member. A plurality (20 in the present embodiment) of teeth 300a that are arranged in parallel at equal intervals in the circumferential direction are provided on the outer peripheral surface of the stator core 30a.

  The coil 31a is an electric wire that receives power supply from an in-vehicle battery (not shown), and is wound around a tooth 300a of the stator core 30a.

  The rotor 3 b has a rotor core 30 b and a segment magnet 31 b and is disposed on the outer peripheral side of the first electric motor 3.

  The rotor core 30b is formed by laminating a plurality of silicon steel plates, for example, and is entirely formed of a cylindrical member.

  The segment magnet 31b is composed of a plurality of (four in this embodiment) permanent magnets magnetized on the north and south poles from the rotor radial inner side toward the rotor radial outer side, and the rotor radial inner side from the rotor radial outer side. The inner surface of the rotor core 30b is composed of a plurality of (four in the present embodiment) permanent magnets magnetized in the N and S poles, and these two types of permanent magnets are alternately arranged in the circumferential direction. Are bonded at equal intervals.

(Configuration of second electric motor 4)
The second electric motor 4 has a stator 4a and a rotor 4b, is connected to the rear differential 107 via the speed reduction transmission mechanism 2 on the rotation axis O (shown in FIG. 2), and the stator 4a is connected to the ECU 5. ing. The second electric motor 4 causes the stator 4a to input a control signal from the ECU 5 to generate a second motor driving force b for operating the rear differential 107 between the rotor 4b and rotate the rotor 4b. It is configured to let you.

  The stator 4 a has a stator core 40 a and a coil 41 a, is disposed on the inner peripheral side of the second electric motor 4, and is fixed to the differential carrier 106. The stator 4 a is connected to the stator 3 a of the first electric motor 3 through a plurality of connecting pins 11. The stator 4a is attached to a differential carrier 106 (shown in FIG. 2) by a nut 13 (shown in FIG. 2) together with the stator 3a.

  The stator core 40a is formed by laminating a plurality of silicon steel plates, for example, and is entirely formed of a cylindrical member. A plurality (20 in this embodiment) of teeth 400a are provided on the outer peripheral surface of the stator core 40a in parallel at equal intervals in the circumferential direction.

  The coil 41a is an electric wire that receives power supply from an in-vehicle battery (not shown), and is wound around the teeth 400a of the stator core 40a.

  The rotor 4 b has a rotor core 40 b and a segment magnet 41 b, is disposed on the outer peripheral side of the second electric motor 4, and is connected to the rotor 3 b of the first electric motor 3 via the connecting cylinder 10.

  The rotor core 40b is formed by laminating a plurality of silicon steel plates, for example, and is entirely formed by a cylindrical member.

  The segment magnet 41b is composed of a plurality of (four in this embodiment) permanent magnets magnetized on the north and south poles from the rotor radial inner side toward the rotor radial outer side, and the rotor radial inner side from the rotor radial outer side. The inner peripheral surface of the rotor core 40b is composed of a plurality of (four in the present embodiment) permanent magnets magnetized in the N and S poles, and these two types of permanent magnets are alternately arranged in the circumferential direction. Are bonded at equal intervals.

(Configuration of ECU 5)
The ECU 5 is connected to a sensor (not shown) in addition to the first electric motor 3 and the second electric motor 4. Then, the ECU 5 inputs a detection signal from the sensor and controls to alternately drive the first electric motor 3 and the second electric motor 4 when the driving torque for the rear differential 107 requires a torque less than a predetermined torque. And a control signal for driving both the first electric motor 3 and the second electric motor 4 when the driving torque for the rear differential 107 requires a torque greater than a predetermined torque. .

  As a result, the ECU 5 drives at least one of the first electric motor 3 and the second electric motor 4 to operate the power system on the rear wheel side, and drives the front wheel 104 with the engine 102. The four-wheel drive vehicle 101 is brought into a four-wheel drive state by the front wheel side power system and the rear wheel side power system.

  Further, the ECU 5 stops driving the first electric motor 3 and the second electric motor 4 during normal traveling of the four-wheel drive vehicle 101 to stop the operation of the power system on the rear wheel side, and the front wheel 104 is connected to the engine 102. And the four-wheel drive vehicle 101 is brought into a two-wheel drive state by the power system on the front wheel side.

(Operation of the motor driving force transmission device 1)
Next, the operation of the motor driving force transmission apparatus shown in the present embodiment will be described with reference to FIGS.

  In FIG. 2, power is supplied to one of the first electric motor 3 and the second electric motor 4 of the four-wheel drive vehicle 101 (shown in FIG. 1) (for example, the first electric motor 3). When the first electric motor 3 is driven, the first motor driving force a (shown in FIG. 6) is applied to the deceleration transmission mechanism 2 via the connecting cylinder 10, and the deceleration transmission mechanism 2 is activated.

Therefore, the speed reduction transmission mechanism 2, rotates the eccentric cam 6 is for example an arrow m ₁ direction, as shown in FIGS. 3 and 4, eccentric in an arrow n ₁ direction while the transmission members 8 and 9 to slide relative to each other Perform a circular motion with the quantity δ.

Accordingly, the first motor driving force a is transmitted from the transmission members 8 and 9 to the external gear 110c of the rear differential 107 (shown in FIG. 1), and the external gear 110c is rotated in the rotational direction of the eccentric cams 6 and 7. It rotates in the opposite direction (arrow _{m 2} direction).

  As a result, the rear differential 107 is operated, and the first motor driving force a is distributed to the rear axle shaft 108 and transmitted to the left and right rear wheels 105.

  Here, when the driving torque for the rear differential 107 requires a torque less than a predetermined torque, in order to continue the continuous operation of the motor driving force transmission device 1, the time for continuously driving the first electric motor 3 is a predetermined time. When the time has elapsed, the power supply to the first electric motor 3 is stopped, and the second electric motor 4 as the other electric motor is driven. This is because if the electric power supply to the first electric motor 3 is continued after the predetermined time has elapsed, the first electric motor 3 will generate excessive heat, so the electric power supply to the first electric motor 3 will be reduced. This is for stopping and avoiding excessive heat generation of the first electric motor 3.

  When electric power is supplied to the second electric motor 4 to drive the second electric motor 4, the second motor driving force b (shown in FIG. 6) is transmitted to the deceleration transmission mechanism 2 via the connecting cylinder 10. The deceleration transmission mechanism 2 is actuated. For this reason, the second motor driving force b is transmitted to the rear differential 107 via the deceleration transmission mechanism 2 as in the case where the first electric motor 3 is driven. As a result, the rear differential 107 is operated, and the second motor driving force b is distributed to the rear axle shaft 108 and transmitted to the left and right rear wheels 105.

  Here, in order to continue the continuous operation of the motor driving force transmission device 1 when the driving torque for the rear differential 107 requires less than a predetermined torque, the time for continuously driving the second electric motor 4 is predetermined. When the time elapses, the power supply to the second electric motor 4 is stopped and the first electric motor 3 is driven.

  In this way, by driving the first electric motor 3 and the second electric motor 4 alternately, excessive heat generation of the first electric motor 3 and the second electric motor 4 is suppressed, and the motor driving force is reduced. The transmission device 1 can be operated continuously.

  In the motor driving force transmission device 1 configured as described above, the deceleration transmission mechanism 2, the first electric motor 3, and the second electric motor 4 are disposed on the outer periphery of the rear differential 107. The axial direction and radial dimension of the transmission device 1 can be shortened.

  In the present embodiment, the rotations of the first electric motor 3 and the second electric motor 4 are decelerated to the deceleration transmission mechanism 2 and transmitted to the rear wheel 105. Therefore, the first electric motor 3 and the second electric motor 3 Even when a low torque electric motor is used as the electric motor 4, a relatively large torque can be transmitted to the rear wheel 105. In this case, the rotor 3b is arranged around the outer periphery of the stator 3a and the rotor 4b is arranged around the outer periphery of the stator 4a. 105 can be transmitted.

  In the present embodiment, the segment magnet 31b of the rotor 3b is bonded to the inner peripheral surface of the rotor core 30b, and the segment magnet 41b of the rotor 4b is bonded to the inner peripheral surface of the rotor core 40b. The force of peeling from the rotor cores 30b and 40b due to the generation of centrifugal force due to rotation does not act on the segment magnets 31b and 41b.

In the above embodiment has described the case in which the eccentric cam 6 is rotated in the arrow m ₁ direction operates the motor driving force transmission device 1, rotating the eccentric cam 6 and 7 in the arrow m ₂ Direction Even if it makes it, the motor drive force transmission apparatus 1 can be operated similarly to the said embodiment. At this time, the external gear 110c is the rotational direction of the eccentric cam 6 rotates in the opposite direction (arrow _{m 1} direction).

  In the present embodiment, the case where the first motor driving force a or the second motor driving force b is transmitted from the deceleration transmission mechanism 2 to the rear differential 107 has been described, but the present invention is not limited to this. First, when the driving torque for the rear differential 107 requires a predetermined torque or more, both the first electric motor 3 and the second electric motor 4 are driven to generate the first motor driving force a and the second motor driving force a. It is also possible to transmit a motor driving force larger than the motor driving force b from the deceleration transmission mechanism 2 to the rear differential 107.

[Effect of the first embodiment]
According to the first embodiment described above, the following effects can be obtained.

(1) The deceleration transmission mechanism 2, the first electric motor 3, and the second electric motor 4 are arranged around the outer periphery of the rear differential 107, and the axial direction and radial dimension of the motor driving force transmission device 1 (device main body) are determined. It is possible to reduce the size of the entire apparatus.

(2) Since the rotor 3b of the first electric motor 3 is disposed on the outer periphery of the stator 3a and the rotor 4b of the second electric motor 4 is disposed on the outer periphery of the stator 4a, the rotor is disposed on the inner periphery of the stator. Compared with the case where it is arrange | positioned in this, a larger motor drive force can be generated.

(3) The first electric motor 3 and the second electric motor 4 can be used alternately so that the motor driving force transmission device 1 can be used continuously, and the motor driving force transmission device 1 is continuously operated over a long period of time. Excessive heat generation of the first electric motor 3 and the second electric motor 4 can be suppressed.

[Second Embodiment]
Next, a motor driving force transmission device according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8 show the speed reduction transmission mechanism. 7 and 8, members having the same or equivalent functions as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 7 and 8, a reduction transmission mechanism 71 of a motor driving force transmission device according to a second embodiment of the present invention has a pair of transmission members 72 and 73 formed by internal gears having a cycloid tooth shape. There is a feature in that.

  For this reason, the external gear 110c of the differential case 110 in the rear differential 107 has a smaller number of teeth than that of the pair of transmission members 72 and 73, and has a cycloidal tooth profile that always meshes with the pair of transmission members 72 and 73. It is formed by gears.

  Further, the pair of transmission members 72 and 73 are disposed along the rotation axis O (shown in FIG. 2) and are separated from the external gear 110c by 180 ° around the rotation axis (rotation axis O). It is connected.

  In the motor driving force transmission device configured as described above, similarly to the motor driving force transmission device 1 shown in the first embodiment, the deceleration transmission mechanism 2, the first electric motor 3, and the second electric motor 4. Is arranged around the outer periphery of the rear differential 107, the axial direction and the radial dimension of the motor driving force transmission device 1 can be shortened.

[Effect of the second embodiment]
According to the second embodiment described above, the same effect as that of the first embodiment can be obtained.

[Third embodiment]
Next, a motor driving force transmission device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 9 shows a motor driving force transmission device. 9, members having the same or equivalent functions as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the motor driving force transmission device 80 according to the third embodiment of the present invention distributes the motor driving force to the housing 81 having the axis of the rear axle shaft 108 as the rotation axis O and the rear wheel 105. A rear differential 107, an electric motor 82 that generates a motor driving force for operating the rear differential 107, and a deceleration transmission mechanism 2 that decelerates and transmits the motor driving force of the electric motor 82 to the rear differential 107. The deceleration transmission mechanism 2 is characterized in that it is disposed on the same axis as the axis (rotation axis O) of the electric motor 82.

  Since the electric motor 82 has substantially the same configuration as the first electric motor 3 and the second electric motor 4 shown in the first embodiment, the reference numerals of the respective parts are denoted by, for example, the respective parts of the first electric motor 3. (The stator of the electric motor 82 is attached to the stator 3a of the first electric motor 3, and the rotor of the electric motor 82 is attached to the rotor 3b of the first electric motor 3. Correspondingly, 82b is attached), and the description thereof is omitted.

  The differential case 110 has one end on the bearing mounting portion 810b of the first housing element 810 via the ball bearing 86 and the other end on the bearing mounting portion 830b on the stator support member 83 via the ball bearing 87. Each is supported rotatably.

  The housing 81 includes a first housing element 810 that houses the rear differential 107 and the speed reduction transmission mechanism 2, and a second housing that communicates with the first housing element 810 and houses the electric motor 82 (except for a part thereof). It has a housing element 811 and is disposed on the vehicle body.

  The first housing element 810 is disposed on one side of the housing 81 and is entirely formed of a stepped bottomed cylindrical member that opens to the second housing element 811 side. A shaft insertion hole 810 a through which the rear axle shaft 108 is inserted is provided at the bottom of the first housing element 810.

  The shaft insertion hole 810a is disposed with a cover 115 covering the opening interposed between the shaft insertion hole 810a and one rear wheel 105. The cover 115 has a cylindrical portion 115 a through which the rear axle shaft 108 is inserted, and the inner peripheral surface of the cylindrical portion 115 a is attached to the outer peripheral surface of the rear axle shaft 108. A seal member 116 that seals the opening is attached to the inner peripheral surface of the shaft insertion hole 810a. Also, a bearing mounting portion 810b for a differential case is provided on the inner peripheral surface of the shaft insertion hole 810a.

  An opening flange of the first housing element 810 is integrally provided with a mounting flange 810c that projects from the outer peripheral surface thereof. The first housing element 810 is provided with a plurality of (six in this embodiment) pin mounting holes 810d that are arranged in parallel around the rotation axis O at equal intervals and to which the connection pins 11 are attached.

  The second housing element 811 is disposed on the other side of the housing 81 and is entirely formed of a bottomed cylindrical member that opens to the first housing element 810 side. A shaft insertion hole 811 a through which the rear axle shaft 108 is inserted is provided at the bottom of the second housing element 811.

  The shaft insertion hole 811 a is disposed such that a cover 117 covering the opening is interposed between the shaft insertion hole 811 a and the other rear wheel 105. The cover 117 has a cylindrical portion 117 a through which the rear axle shaft 108 is inserted, and the inner peripheral surface of the cylindrical portion 117 a is attached to the outer peripheral surface of the rear axle shaft 108. A seal member 118 that seals the opening is attached to the inner peripheral surface of the shaft insertion hole 811a.

  In addition, at the bottom of the second housing element 811, a first rising portion 811 b that protrudes to the inner peripheral edge of the shaft insertion hole 811 a and a second rising portion 811 c that protrudes outside the first rising portion 811 b. Are provided integrally. A cylindrical stator support member 83 facing the bottom of the second housing element 811 via the electric motor 82 is attached to the first rising portion 811b together with the stator 82a of the electric motor 82 by mounting bolts 84.

  The stator support member 83 has a shaft insertion hole 83 a through which the rear axle shaft 108 is inserted, and is disposed between the electric motor 82 and the speed reduction transmission mechanism 2. The stator support member 83 is integrally provided with a flange 83b protruding from the outer peripheral surface thereof. A bearing mounting portion 830b for the differential case is provided on the inner peripheral surface of the flange 83b. The flange 83b is provided with a plurality (six in this embodiment) of pin attachment holes 831b for attaching the connecting pins 11.

  A bearing mounting portion 8110b for the shaft is provided on the inner peripheral surface of the first rising portion 811b, and a bearing mounting portion 8110c for the rotor is provided on the outer peripheral surface of the second rising portion 811c.

  The electric motor 82 is composed of an outer rotor motor having a stator 82a and a rotor 82b. The electric motor 82 is connected to the rear differential 107 via the reduction transmission mechanism 2 on the motor shaft (rotation axis O), and the stator 82a is connected to the ECU 5 (FIGS. 2 and 2). 5). The electric motor 82 is configured so that the stator 82a receives a control signal from the ECU 5 to generate a motor driving force for operating the rear differential 107 with the rotor 82b, and rotates the rotor 82b. .

  The stator 82 a is disposed on the inner peripheral side of the electric motor 82, and is attached to the first rising portion 811 b of the second housing element 811 together with the stator support member 83 by a mounting bolt 84.

  The rotor 82b is disposed on the outer peripheral side of the electric motor 82, and is rotatably supported via a ball bearing 85 on a rotor bearing mounting portion 8110c of the second rising portion 811c.

  The deceleration transmission mechanism 2 includes a pair of eccentric cams 6 and 7 that rotate when the electric motor 82 is driven, and a pair of transmission members 8 and 9 that swing when the pair of eccentric cams 6 and 7 rotate. It is arranged on the outer periphery of the rear differential 107 on the same axis as the 82 axis (rotation axis O).

When the eccentric cam 6 is rotated in the circumferential direction of the one direction (arrow m ₁ direction), the transmission member 8 is swung to its axis O ₁ is moved in the arrow n ₁ direction around a rotational axis O. Other direction of the eccentric cam 6 is circumferentially rotates (arrow m ₂ direction), the transmission member 8 (opposite to the direction of the arrow n ₁ direction) the axis O ₁ arrow n ₂ direction about the rotation axis O Swing to move to. The transmission member 8 rotates around the rotation axis O and rotates about the axis O ₁ along the circumferential direction of a circle having a radius of the eccentricity δ and makes one rotation with respect to the housing (device main body) 81. Revolve without having to.

When the eccentric cam 7 is rotated in the circumferential direction of the one direction (arrow m ₁ direction), the transmission member 9 swings so that its axis O ₂ is moved in the arrow n ₁ direction around a rotational axis O. Other direction of the eccentric cam 7 is circumferentially rotates (arrow m ₂ direction), the transmission member 9 (direction opposite to the arrow n ₁ direction) the axis O ₂ by the arrow n ₂ direction about the rotation axis O Swing to move to. The transmission member 9 rotates around the rotation axis O and moves about the axis O ₂ along the circumferential direction of a circle having a radius of the eccentricity δ to rotate about one rotation with respect to the housing (device main body) 81. Revolve without having to.

  In the motor driving force transmission device 80 configured as described above, when electric power is supplied to the electric motor 82 to drive the electric motor 82, the motor driving force of the electric motor 82 is applied to the deceleration transmission mechanism 2 via the connecting cylinder 10. Then, the deceleration transmission mechanism 2 operates in the same manner as the motor driving force transmission device 1 shown in the first embodiment.

[Effect of the third embodiment]
According to the third embodiment described above, the following effects can be obtained.

(1) The reduction transmission mechanism 2 can be arranged around the outer periphery of the electric motor 82 to shorten the radial dimension of the motor driving force transmission device 1 (apparatus main body), and to reduce the apparatus radial dimension. it can.

(2) Since the rotor 82b of the electric motor 82 is disposed on the outer periphery of the stator 82a, a larger motor driving force can be generated as compared with the case where the rotor is disposed on the inner periphery of the stator.

[Fourth embodiment]
Next, a motor driving force transmission device according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 10 shows a motor driving force transmission device. 10, members having the same or equivalent functions as those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 10, the fourth motor driving force transmission apparatus 90 according to an embodiment of the present invention is a peripheral portion of the differential case (input member) 110 in the rear differential 107, than the maximum outer diameter D ₁ Further, the eccentric cams 6 and 7 are arranged around the outer periphery of the portions 110g and 110h having a small outer diameter.

  For this reason, the differential case 110 includes portions 110g and 110h, has a portion 110d that supports the pinion gear shaft 111 at the center in the axial direction, and has portions 110e and 110f to which the ball bearings 86 and 87 are attached at both ends in the axial direction. The rotation member is formed by a rotation member that is substantially symmetrical with respect to the rotation axis O and the axis L.

Outer diameter D ₁ of the portion 110d is set to the maximum dimension of the outer diameter of the outer periphery of the differential case 110.

The part 110e is arranged on one side in the axial direction of the part 110d, and the part 110f is arranged on the other side in the axial direction of the part 110d. Outer diameter _{D 2} sites 110e is set to a dimension smaller than the outer diameter _D 3 of the site _{110f (D 3> D 2)} . Outer diameter _{D 3} of outer diameter _{D 2} and site 110f sites 110e is set to a dimension smaller than the outer diameter _{D 1 (D 1> D 3} > D 2) of both sites 110d.

The parts 110g and 110h are arranged in parallel to each other in the direction of the axis (rotation axis O) of the differential case 110. The part 110g is disposed between the part 110d and the part 110e, and the part 110h is disposed between the part 110d and the part 110f. Site 110g, the outer diameter of 110h are substantially equal (and _{D 4),} the outer diameter _{D 2, D 3 (D 3} <D 4) to dimensions greater than and an outer diameter _{D 1 (D 1> D 3} ) Are set to smaller dimensions.

  An external gear 110i that meshes with one transmission member 8 is attached to the outer peripheral portion of the portion 100g, and an external gear 110j that meshes with the other transmission member 9 is attached to the outer peripheral portion of the portion 110h. As the external gears 110i and 110j, involute gears having the rotation axis O as the gear axis are used.

  One transmission member 8 has a pin insertion hole 8 a inserted through the connecting pin 11, and is supported by the connecting pin 11 via a needle roller bearing 88 so as to be rotatable (circular movement). One transmission member 8 has an eccentric cam (first eccentric cam) 6 disposed on the outer peripheral portion thereof via a needle roller bearing 12 so as to be rotatable. Then, the movement of the one transmission member 8 is restricted by the movement restriction member 98 toward the other transmission member 9.

  The other transmission member 9 has a pin insertion hole 9 a inserted through the connection pin 11, and is supported by the connection pin 11 via a needle roller bearing 88 so as to be able to rotate (circulate). Further, the other transmission member 9 has a second eccentric cam (second eccentric cam) 7 disposed on the outer peripheral portion thereof via a needle roller bearing 12 so as to be rotatable. Then, the movement of the other transmission member 9 is restricted by the movement restriction member 99 to the one transmission member 8 side.

  In the motor driving force transmission device 90 configured as described above, when electric power is supplied to the electric motor 82 to drive the electric motor 82, the motor driving force of the electric motor 82 is applied to the deceleration transmission mechanism 2 via the connecting cylinder 10. Then, the deceleration transmission mechanism 2 operates in the same manner as the motor driving force transmission device 80 shown in the third embodiment.

[Effect of the fourth embodiment]
According to the fourth embodiment described above, the following effects can be obtained.

(1) a peripheral portion of the differential case 110, its maximum outer diameter _D site 110g having a small outer diameter _{D 4} than _1, the motor driving force transmission apparatus is arranged an eccentric cam 6 and 7 on the outer periphery of 110h 90 The radial dimension can be shortened, and the apparatus radial dimension can be reduced. In this case, since the size reduction in the apparatus radial direction enables the reduction transmission mechanism 2 to be arranged using the space portions (so-called dead spaces) located on both sides in the axial direction of the portion 110d in the differential case 110, the apparatus This is done avoiding the increase in size in the axial direction.

(2) site 110g, site has a smaller outer diameter _D 2, _{D 3} than the outer diameter _{D 4} of 110h 110e, it is possible to arrange the ball bearing 86 and 87 to 110f, the ball bearings 86 and 87 is miniaturized The cost can be reduced.

(3) Since the rotor 82b of the electric motor 82 is disposed on the outer periphery of the stator 82a, as compared with the case where the rotor is disposed on the inner periphery of the stator, as in the effect shown in the third embodiment. A large motor driving force can be generated.

  As mentioned above, although the motor drive force transmission apparatus of this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment, In various aspects in the range which does not deviate from the summary. For example, the following modifications are possible.

(1) In the above embodiments (the first embodiment and the second embodiment), when a predetermined time has elapsed, the first electric motor 3 and the second electric motor 4 are switched. Although driven alternately, the present invention is not limited to this, and the electric motor may be switched when the integrated value of the motor current of the first electric motor or the second electric motor becomes equal to or greater than a predetermined threshold. In addition, when the temperature of the first electric motor or the second electric motor becomes equal to or higher than a predetermined threshold, or when the rotation speed of the first electric motor or the second electric motor becomes a predetermined threshold, The motor may be switched.

(2) In the above embodiment, equal to the distance from the point O ₂ of the center of the distance between the through-holes 7a from the point O ₁ of the center of the through hole 6a to the rotation axis O to the rotation axis O, and the point O ₁ One eccentric cam 6 and the other eccentric cam 7 are mounted on the inner peripheral surface of the second connecting member (connecting cylinder) 10 so that the distances between them and the point O ₂ around the rotation axis O are equal. The case where the pair of transmission members 8 and 9 (transmission members 72 and 73) are disposed on the rear differential 107 at portions spaced apart at equal intervals (180 °) around the rotation axis has been described. However, the number of transmission members can be changed as appropriate. That is, when the number of transmission members is n (n ≧ 3), the center of the through hole of the first eccentric cam is in a virtual plane perpendicular to the rotation axis of the second connecting member (rotary axis of the rear differential). A point at the center of the through hole of the second eccentric cam,..., A point at the center of the through hole of the nth eccentric cam are sequentially arranged in one direction around the rotation axis of the second connecting member; Then, the distance from the center point of each through-hole to the rotation axis of the second connecting member is equal, and the first eccentric cam, the second eccentric cam,..., The n-th eccentric cam are adjacent to each other. Each eccentric cam has an inner peripheral surface of the second connecting member so that the included angle formed by the line connecting the center point of the through holes of the two eccentric cams and the rotation axis of the second connecting member is 360 ° / n. N transmission members are mounted on the rear differential to rotate the rotation axis thereof. It is disposed at a site spaced at intervals of 360 ° / n in. For example, when there are three transmission members, the center point of the through hole of the first eccentric cam and the center of the through hole of the second eccentric cam on the virtual plane orthogonal to the rotation axis of the second connecting member When the center point of the through hole of the third eccentric cam is sequentially arranged in one direction around the rotation axis of the second connecting member, the second connecting point is connected to the center point of each through hole. The second connecting member and the center point of the through-holes of the two eccentric cams adjacent to each other among the first eccentric cam, the second eccentric cam, and the third eccentric cam that have the same distance to the rotation axis of the member The eccentric cams are mounted on the inner peripheral surface of the second connecting member so that the included angle formed by the line connecting the rotation axis of the second connecting member is 120 °, and the three transmission members are the rotational axis of the rear differential. It arrange | positions in the site | part spaced apart at intervals of 120 degrees around.

(3) In the above-described embodiment, the case where the engine 102 and the electric motors 3 and 4 are used together as a drive source has been described. However, the present invention is not limited to this, and only the electric motor is used. The present invention can also be applied to an electric vehicle used as a drive source in the same manner as the above embodiment.

(4) In the above embodiment, the front wheel 104 is mounted by the engine 102 mounted on the front side of the vehicle, and the electric motor mounted on the rear side of the vehicle (the first electric motor 3 and the first motor in the first and second embodiments). In the third and fourth embodiments, the case where the present invention is applied to the four-wheel drive vehicle 101 that drives the rear wheels 105 with the electric motor 82) has been described. However, the present invention is not limited to this. The present invention can also be applied to a four-wheel drive vehicle in which a rear wheel is driven by an engine mounted on the front of the vehicle and a front wheel is driven by an electric motor mounted on the rear of the vehicle.

DESCRIPTION OF SYMBOLS 1 ... Motor drive force transmission device, 2 ... Deceleration transmission mechanism, 3 ... 1st electric motor, 3a ... Stator, 30a ... Stator core, 300a ... Teeth, 31a ... Coil, 3b ... Rotor, 30b ... Rotor core, 31b ... Segment magnet 4 ... 2nd electric motor, 4a ... Stator, 40a ... Stator core, 400a ... Teeth, 41a ... Coil, 4b ... Rotor, 40b ... Rotor core, 41b ... Segment magnet, 5 ... ECU, 6, 7 ... Eccentric cam, 6a , 7a ... through-hole, 8, 9 ... transmission member, 8a, 9a ... pin insertion hole, 10 ... coupling cylinder, 11 ... coupling pin, 12 ... needle roller bearing, 13 ... nut, 71 ... deceleration transmission mechanism, 72, 73 ... Transmission member, 80 ... Motor driving force transmission device, 81 ... Housing, 810 ... First housing element, 810a ... Shaft insertion , 810b ... Bearing mounting portion, 810c ... Mounting flange, 810d ... Pin mounting hole, 811 ... Second housing element, 811a ... Shaft insertion hole, 811b ... First rising portion, 8110b ... Bearing mounting portion, 811c ... First 2 rising portions, 8110c ... bearing mounting portion, 82 ... electric motor, 82a ... stator, 82b ... rotor, 83 ... stator support member, 83a ... shaft insertion hole, 83b ... flange, 830b ... bearing mounting portion, 831b ... pin mounting Holes 84, mounting bolts 85, 86, 87, ball bearings 88, needle roller bearings 90, motor driving force transmission devices 98, 99, movement restricting members 115, covers 115a, cylindrical portions 116, seals 117, a cover, 117a, a cylindrical portion, 118, a seal member, 101, a four-wheel drive vehicle, 2 ... Engine, 103 ... Transaxle, 104 ... Front wheel, 105 ... Rear wheel, 106 ... Differential carrier, 107 ... Rear differential, 108 ... Rear axle shaft, 109 ... Front axle shaft, 110 ... Differential case, 110a ... Housing space, 110b ... 110c, external gear, 110d, 110e, 110f, 110g, 110h, part, 110i, 110j, external gear, 111 ... pinion gear shaft, 112 ... pinion gear, 113 ... side gear, 114 ... taper roller bearing, a ... first motor driving force, b ... second motor driving _{force, D 1, D 2, D} 3, D 4 ... outer diameter, O ... rotation axis, _{O 1,} O 2 _... point (axis), L ... Axis, δ, δ ₁ , δ ₂ ... Eccentricity

Claims (9)

An electric motor for generating a motor driving force for operating the differential mechanism;
A deceleration transmission mechanism that decelerates and transmits the motor driving force of the electric motor to the differential mechanism;
The deceleration transmission mechanism includes an eccentric cam that rotates by driving of the electric motor, and a transmission member that rotates by rotation of the eccentric cam, and is disposed on the outer periphery of the differential mechanism.   The motor driving force transmission device according to claim 1, wherein the electric motor is disposed on an outer periphery of the differential mechanism.   The motor driving force transmission device according to claim 1, wherein the electric motor includes a stator fixed to the apparatus main body and a rotor that rotates around an outer periphery of the stator.   The electric motor includes a first electric motor that generates a first motor driving force, and a second electric motor that is connected to the first electric motor and generates a second motor driving force, 4. The motor driving force transmission device according to claim 1, wherein the first electric motor and the second electric motor are coupled to the differential mechanism via the deceleration transmission mechanism. 5.   The deceleration transmission mechanism includes a plurality of eccentric cams in which the eccentric cam is rotated by driving of at least one of the first electric motor and the second electric motor, and the transmission member is the plurality of eccentric cams. The motor driving force transmission device according to claim 4, comprising a plurality of transmission members rotating by rotation of the cam.   6. The motor driving force transmission device according to claim 5, wherein the speed reduction transmission mechanism is disposed at a portion where the plurality of transmission members are spaced apart from the differential mechanism at equal intervals around a rotation axis thereof.   7. The motor driving force transmission according to claim 1, wherein the reduction transmission mechanism includes an internal gear in which the plurality of transmission members mesh with input members of the differential mechanism via external gears. apparatus.   The said deceleration transmission mechanism is the outer peripheral part of the input member in the said differential mechanism, Comprising: The some eccentric cam is arrange | positioned in the outer periphery of the site | part which has an outer diameter smaller than the maximum outer diameter. The motor driving force transmission device according to claim 7.   The deceleration transmission mechanism includes a first eccentric cam that positions the plurality of eccentric cams on one side in the axial direction central portion of the input member, and an axial direction other side of the central portion in the axial direction of the input member. The motor driving force transmission device according to claim 8, wherein the first eccentric cam and the second eccentric cam are arranged in parallel in an axial direction of the input member.

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