JP2022088875A - Vehicle drive device - Google Patents

Abstract

To provide a vehicle drive device capable of downsizing dimension in an axial direction while appropriately supporting rotors of both a first electric rotary machine and a second electric rotary machine even in a configuration where the first electric rotary machine and the second electric rotary machine are coaxially arranged.SOLUTION: A vehicle drive device includes: a first bearing B1 and a second bearing B2 rotatably supporting a first rotor support member 13A penetrating a first rotor 12A and a second rotor support member 13B in an axial direction L; and a third bearing B3 rotatably supporting the second rotor support member 13B. A case 9 is provided with: a first chamber 9A which houses a first electric rotary machine 1A and a second electric rotary machine 1B; a partition part 92c which partitions an output differential gear mechanism 3 and a second chamber housing a power transmission device 4 in an axial direction L; and a side wall part 91c provided so as to cover an axial direction first side L1 of the first chamber 9A. The first bearing B1 is supported by the side wall part 91c, the second bearing B2 is supported by the second rotor support member 13B, and a third bearing B3 is supported by the partition part 92c.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle drive device including two rotary electric machines and a differential gear mechanism for output.

An example of such a vehicle drive device is disclosed in Patent Document 1 below. Hereinafter, in the description of the "background technique" and the "problem to be solved by the invention", the reference numerals in Patent Document 1 are quoted in parentheses.

The vehicle drive device of Patent Document 1 includes a first rotary electric machine (60), a second rotary electric machine (70), an input member (1) which is driven and connected to an internal combustion engine (50), and a first rotary electric machine (1). 60), a second rotary electric machine (70), and an output differential gear mechanism (45) that distributes the rotation transmitted from the input member (1) to a pair of output members that are driven and connected to the wheels, respectively. I have.

International Publication No. 2009/128288 (Fig. 2)

In the vehicle drive device of Patent Document 1, the first rotary electric machine (60) and the second rotary electric machine (70) are arranged coaxially. The first rotary electric machine (60) and the second rotary electric machine (70) are arranged side by side in the axial direction with the support wall portion provided in the case (52) interposed therebetween. The rotor shaft (2c) of the first rotary electric machine (60) is rotatably supported by a pair of first bearings (61, 62). The rotor shaft (2b) of the second rotary electric machine (70) is rotatably supported by a pair of second bearings (71, 72). One of the pair of first bearings (61) and one of the pair of second bearings (72) are supported by the support wall in a state of being arranged side by side in the axial direction. ing.

As described above, in the vehicle drive device of Patent Document 1, in the configuration in which the first rotary electric machine (60) and the second rotary electric machine (70) are arranged coaxially, the rotor shaft of the first rotary electric machine (60) ( 1st rotary electric machine (60) and 2nd rotation in the axial direction to support each of the bearing (61) of 2c) and the bearing (72) of the rotor shaft (2b) of the 2nd rotary electric machine (70). A support wall portion is provided between the electric machine (70) and the electric machine (70). Therefore, there is a problem that the axial dimension of the vehicle drive device tends to be large.

Therefore, even if the first rotary electric machine and the second rotary electric machine are arranged coaxially, the axial dimensions can be reduced while appropriately supporting both the rotors of the first rotary electric machine and the second rotary electric machine. It is desired to realize a drive device for a vehicle that can achieve the above.

In view of the above, the characteristic configuration of the vehicle drive device is
The input member that is driven and connected to the internal combustion engine and
A pair of output members that are driven and connected to the wheels, respectively.
A first rotary electric machine having a first stator and a first rotor arranged inside the first stator in the radial direction.
A second rotary electric machine having a second stator and a second rotor arranged inside the second stator in the radial direction.
An output differential gear mechanism that distributes the input rotation to the pair of output members,
A power transmission mechanism that transmits a driving force between the input member, the first rotor, the second rotor, and the output differential gear mechanism, and
A case for accommodating the first rotary electric machine, the second rotary electric machine, the output differential gear mechanism, and the power transmission mechanism is provided.
The first rotary electric machine and the second rotary electric machine are arranged coaxially.
The output differential gear mechanism is arranged on a shaft separate from the first rotary electric machine and the second rotary electric machine.
The first rotary electric machine includes a first rotor support member connected so as to rotate integrally with the first rotor.
The second rotary electric machine includes a second rotor support member connected so as to rotate integrally with the second rotor.
The first rotor support member is arranged so as to penetrate the first rotor and the second rotor support member in the axial direction.
One side in the axial direction is the first side in the axial direction, and the other side is the second side in the axial direction.
A first bearing, which is arranged on the first side in the axial direction with respect to the first rotor and rotatably supports the first rotor support member,
A second bearing, which is arranged on the second side in the axial direction with respect to the first rotor and rotatably supports the first rotor support member,
A third bearing that rotatably supports the second rotor support member is further provided.
The first rotor is arranged on the first side in the axial direction with respect to the second rotor.
The case includes the first chamber in which the first rotary electric machine and the second rotary electric machine are housed, the differential gear mechanism for output, and the differential gear mechanism for output, which are arranged on the second side in the axial direction with respect to the first chamber. A second chamber in which a power transmission mechanism is housed, a partition portion for partitioning the first chamber and the second chamber in the axial direction, and a first chamber in the axial direction of the first chamber. With a side wall provided to cover the side,
The first bearing is supported by the side wall portion and is supported by the side wall portion.
The second bearing is supported by the second rotor support member, and the second bearing is supported by the second rotor support member.
The third bearing is supported by the compartment.

According to this characteristic configuration, in a configuration in which the first rotary electric machine and the second rotary electric machine are arranged coaxially, the first rotary electric machine and the second rotary electric machine are housed together in the first chamber formed in the case. There is. The third bearing that supports the second rotor support member is supported by the compartment, so that the second rotor support member is supported by the case. Therefore, the second rotor can be appropriately supported. Further, the first rotor support member that penetrates the second rotor support member in the axial direction is supported by the second rotor support member via the second bearing. As a result, the first rotor support member is supported by the case on the second side in the axial direction with respect to the first rotor via the second bearing, the second rotor support member, and the third bearing. Therefore, the first rotor can be appropriately supported without providing a support portion of the case such as a support wall between the first rotary electric machine and the second rotary electric machine in the axial direction. Therefore, the first rotary electric machine and the second rotary electric machine should be arranged closer to each other in the axial direction as compared with the configuration in which the support portion of the case is provided between the first rotary electric machine and the second rotary electric machine in the axial direction. Therefore, it is possible to reduce the size of the axial dimension of the vehicle drive device.
Further, the first rotor support member is supported on the side wall portion of the case via the first bearing on the first side in the axial direction with respect to the first rotor. By arranging the first bearing and the second bearing in this way, the first rotor support member is appropriately supported with respect to the case via the bearing on both sides in the axial direction with respect to the first rotor. There is. Therefore, the support interval of the first rotor support member in the axial direction can be appropriately secured, and the first rotor can be stably supported.
As described above, according to this characteristic configuration, even if the first rotary electric machine and the second rotary electric machine are arranged coaxially, the first rotor and the second rotor are appropriately supported for the vehicle. It is possible to reduce the size of the axial dimension of the drive device.

Sectional drawing along the axial direction of the vehicle drive device which concerns on embodiment Skeleton diagram of a vehicle drive device according to an embodiment Sectional drawing which shows the peripheral structure of the 1st rotary electric machine and the 2nd rotary electric machine in the drive device for a vehicle which concerns on embodiment. Sectional drawing which shows the peripheral structure of the power transmission mechanism in the drive device for a vehicle which concerns on embodiment.

Hereinafter, the vehicle drive device 100 according to the embodiment will be described with reference to the drawings. As shown in FIGS. 1 and 2, the vehicle drive device 100 includes a first rotary electric machine 1A and a second rotary electric machine 1B, an input member 21, a pair of output members 22, and an output differential gear mechanism 3. A power transmission mechanism 4 and a case 9 are provided. In the present embodiment, the power transmission mechanism 4 includes a distribution differential gear mechanism 5, a reduction differential gear mechanism 6, and a counter gear mechanism 7.

The first rotary electric machine 1A and the second rotary electric machine 1B are arranged on the first axis X1 as their rotation axis. That is, the first rotary electric machine 1A and the second rotary electric machine 1B are arranged coaxially. In the present embodiment, the input member 21, the distribution differential gear mechanism 5, and the deceleration differential gear mechanism 6 are also arranged on the first axis X1. The counter gear mechanism 7 is arranged on the second axis X2 as its rotation axis center. The output differential gear mechanism 3 is arranged on the third axis X3 as its rotation axis center. That is, the output differential gear mechanism 3 is arranged on a shaft different from the first rotary electric machine 1A and the second rotary electric machine 1B. In this embodiment, the pair of output members 22 are also arranged on the third axis X3.

In this example, the axes X1 to X3 are arranged parallel to each other. In the following description, the direction parallel to the axes X1 to X3 is referred to as the "axial direction L" of the vehicle drive device 100. Then, in the axial direction L, the side on which the input member 21 is arranged with respect to the internal combustion engine EG is referred to as "axial first side L1", and the opposite side thereof is referred to as "axial second side L2". Further, the direction orthogonal to each of the above axes X1 to X3 is defined as the "diameter direction R" with respect to each axis. When it is not necessary to distinguish which axis is used as a reference, or when it is clear which axis is used as a reference, it may be simply described as "diameter direction R".

The case 9 houses the first rotary electric machine 1A, the second rotary electric machine 1B, the output differential gear mechanism 3, and the power transmission mechanism 4. In the present embodiment, the case 9 relates to the first case member 91, the second case member 92 joined to the first case member 91 from the second side L2 in the axial direction, and the second case member 92. A third case member 93 joined from the second side L2 in the axial direction is provided.

In the present embodiment, the first case member 91 includes a first peripheral wall portion 91a, a second peripheral wall portion 91b, and a first side wall portion 91c. The first peripheral wall portion 91a is formed in a cylindrical shape that surrounds the outside of the first rotary electric machine 1A in the radial direction R. The second peripheral wall portion 91b is formed in a cylindrical shape that surrounds the outside of the second rotary electric machine 1B in the radial direction R. In the present embodiment, the second peripheral wall portion 91b is arranged on the second side L2 in the axial direction with respect to the first peripheral wall portion 91a. The second peripheral wall portion 91b is formed to have a larger diameter than the first peripheral wall portion 91a. The first side wall portion 91c is formed so as to close the opening of the first peripheral wall portion 91a on the first side L1 in the axial direction.

In the present embodiment, the second case member 92 includes a third peripheral wall portion 92a, a second side wall portion 92b, and a partition portion 92c. The third peripheral wall portion 92a is formed in a cylindrical shape that surrounds the outside of the radial direction R of the input member 21, the pair of output members 22, the output differential gear mechanism 3, and the power transmission mechanism 4. In the present embodiment, the third peripheral wall portion 92a includes an input member 21, a first portion surrounding the outside of the power transmission mechanism 4 in the radial direction R, a pair of output members 22, and an output differential gear mechanism 3. Includes a second portion surrounding the outside of the radial direction of R. The first portion of the third peripheral wall portion 92a is joined to the second peripheral wall portion 91b from the second side L2 in the axial direction. The second side wall portion 92b is formed so as to close the opening of the axial first side L1 in the second portion of the third peripheral wall portion 92a. The partition portion 92c is formed so as to close the opening of the axial first side L1 in the first portion of the third peripheral wall portion 92a.

In the present embodiment, the third case member 93 includes a third side wall portion 93a. The third side wall portion 93a is formed so as to close the opening of the third peripheral wall portion 92a on the second side L2 in the axial direction. In the present embodiment, the third side wall portion 93a is joined to the third peripheral wall portion 92a from the second side L2 in the axial direction.

In the case 9, a first chamber 9A and a second chamber 9B are formed. The first chamber 9A is a space for accommodating the first rotary electric machine 1A and the second rotary electric machine 1B. The second chamber 9B is a space for accommodating the output differential gear mechanism 3 and the power transmission mechanism 4. The second chamber 9B is arranged on the second side L2 in the axial direction with respect to the first chamber 9A. In the present embodiment, the input member 21 and the pair of output members 22 are housed in the second chamber 9B. However, the input member 21 is housed in the second chamber 9B with a part thereof exposed to the outside of the case 9.

In the present embodiment, the first chamber 9A is formed by the first peripheral wall portion 91a, the second peripheral wall portion 91b, the first side wall portion 91c of the first case member 91, and the partition portion 92c of the second case member 92. ing. Further, the second chamber 9B is formed by the third peripheral wall portion 92a, the second side wall portion 92b, and the partition portion 92c of the second case member 92, and the third side wall portion 93a of the third case member 93. That is, the partition portion 92c is provided so as to partition the first chamber 9A and the second chamber 9B in the axial direction L. Further, the first side wall portion 91c is provided so as to cover the first side L1 in the axial direction of the first chamber 9A.

As described above, the case 9 is arranged on the second side L2 in the axial direction with respect to the first chamber 9A in which the first rotary electric machine 1A and the second rotary electric machine 1B are housed and the first chamber 9A. It forms a second chamber 9B in which the dynamic gear mechanism 3 and the power transmission mechanism 4 are housed. The case 9 has a partition portion 92c that partitions the first chamber 9A and the second chamber 9B in the axial direction L, and a first side wall portion provided so as to cover the axial first side L1 of the first chamber 9A. It is equipped with 91c.

The first rotary electric machine 1A has a function as a motor (motor) that receives power supply and generates power, and a function as a generator (generator) that receives power supply and generates power. .. Therefore, the first rotary electric machine 1A is electrically connected to a power storage device (not shown). As this power storage device, various known power storage devices such as a battery and a capacitor can be used. In the present embodiment, the first rotary electric machine 1A functions as a generator that generates electric power by the driving force of the internal combustion engine EG to charge a power storage device or supply electric power for driving the second rotary electric machine 1B. However, the first rotary electric machine 1A may function as a motor that powers and generates a driving force when the vehicle is traveling at high speed or when the internal combustion engine EG is started. The internal combustion engine EG is a prime mover (gasoline engine, diesel engine, etc.) that is driven by the combustion of fuel to extract power.

The first rotary electric machine 1A includes a first stator 11A and a first rotor 12A arranged inside the radial direction R with respect to the first stator 11A.

The first stator 11A includes a first stator core 111A and a first coil end portion 112A. The first stator core 111A is fixed to the non-rotating member. In the present embodiment, the first stator core 111A is fixed to the first peripheral wall portion 91a of the first case member 91. The first coil end portion 112A is formed in a cylindrical shape extending in the axial direction L. The first coil end portion 112A is a coil portion protruding in the axial direction L from the first stator core 111A. Specifically, a coil is wound around the first stator core 111A so as to project from the first stator core 111A on both sides in the axial direction (L1 on the first side in the axial direction and L2 on the second side in the axial direction). There is. Each of the portions of the coil protruding from the first stator core 111A to the axial first side L1 and the axial second side L2 corresponds to the first coil end portion 112A.

The first rotor 12A includes a first rotor core 121A rotatably supported with respect to the first stator core 111A. Although not shown, a permanent magnet is arranged inside the first rotor core 121A.

The second rotary electric machine 1B has a function as a motor (motor) that receives power supply and generates power, and a function as a generator (generator) that receives power supply and generates power. .. Therefore, the second rotary electric machine 1B is also electrically connected to the above-mentioned power storage device in the same manner as the first rotary electric machine 1A. In the present embodiment, the second rotary electric machine 1B mainly functions as a motor that generates a driving force for driving the vehicle. However, when the vehicle is decelerating or the like, the second rotary electric machine 1B may function as a generator that regenerates the inertial force of the vehicle as electric energy.

The second rotary electric machine 1B includes a second stator 11B and a second rotor 12B arranged inside the radial direction R with respect to the second stator 11B.

The second stator 11B includes a second stator core 111B and a second coil end portion 112B. The second stator core 111B is fixed to the non-rotating member. In the present embodiment, the second stator core 111B is fixed to the second peripheral wall portion 91b of the first case member 91. The second coil end portion 112B is formed in a cylindrical shape extending in the axial direction L. The second coil end portion 112B is a coil portion protruding in the axial direction L from the second stator core 111B. Specifically, a coil is wound around the second stator core 111B so as to project from the second stator core 111B on both sides in the axial direction (L1 on the first side in the axial direction and L2 on the second side in the axial direction). There is. Each of the portions of the coil protruding from the second stator core 111B to the axial first side L1 and the axial second side L2 corresponds to the second coil end portion 112B.

The second rotor 12B includes a second rotor core 121B rotatably supported with respect to the second stator core 111B, and a holding body 122B (see FIG. 3) for holding the second rotor core 121B. In the present embodiment, the holding body 122B is a pair of plate members (so-called end plates) that grip the second rotor core 121B from both sides in the axial direction L. Although not shown, a permanent magnet is arranged inside the second rotor core 121B.

The first rotary electric machine 1A is arranged on the first side L1 in the axial direction with respect to the second rotary electric machine 1B. That is, the first rotor 12A is arranged on the first side L1 in the axial direction with respect to the second rotor 12B.

As described above, in the present embodiment, the first case member 91 includes the first peripheral wall portion 91a, and the second case member 92 includes the partition portion 92c. Further, in the present embodiment, the first stator core 111A is fixed to the first peripheral wall portion 91a of the first case member 91. Then, the second stator core 111B is fixed to the second peripheral wall portion 91b of the first case member 91. That is, in the present embodiment, the first stator 11A and the second stator 11B are fixed to the first case member 91.

As described above, in the present embodiment, the case 9 includes a first case member 91 and a second case member 92 joined to the first case member 91 from the second side L2 in the axial direction.
The first side wall portion 91c is provided on the first case member 91, and the first side wall portion 91c is provided.
The compartment 92c is provided on the second case member 92.
The first stator 11A and the second stator 11B are fixed to the first case member 91.

According to this configuration, the first chamber 9A is formed between the axial direction L of the first side wall portion 91c provided on the first case member 91 and the partition portion 92c provided on the second case member 92. The first rotary electric machine 1A and the second rotary electric machine 1B can be accommodated together in the first chamber 9A, and both the first stator 11A and the second stator 11B can be appropriately supported by the case 9. Therefore, the first rotary electric machine 1A and the second rotary electric machine 1B can be appropriately housed in the case 9 and can be appropriately supported by the case 9.

As shown in FIG. 3, in the present embodiment, the first coil end portion 112A of the first rotary electric machine 1A and the second coil end portion 112B of the second rotary electric machine 1B have different radial dimensions from each other. There is. The first coil end portion 112A is inside or outside the radial direction R with respect to the second coil end portion 112B, and is located at a position overlapping the second coil end portion 112B in the radial direction along the radial direction R. Have been placed. In this example, the first coil end portion 112A has a smaller radial dimension than the second coil end portion 112B, and is arranged inside the radial direction R with respect to the second coil end portion 112B. Here, regarding the arrangement of the two elements, "overlapping in a specific direction" means that the virtual straight line is 2 when the virtual straight line parallel to the line-of-sight direction is moved in each direction orthogonal to the virtual straight line. It means that there is at least a part of the area where both of the two elements intersect.

As described above, in the present embodiment, the first stator 11A includes a first stator core 111A and a cylindrical first coil end portion 112A which is a coil portion protruding in the axial direction L from the first stator core 111A. ,
The second stator 11B includes a second stator core 111B and a tubular second coil end portion 112B which is a coil portion protruding in the axial direction L from the second stator core 111B.
The first coil end portion 112A is arranged at a position inside or outside the radial direction R with respect to the second coil end portion 112B and overlapping the second coil end portion 112B in the radial direction along the radial direction R. ing.

According to this configuration, since the first coil end portion 112A and the second coil end portion 112B are arranged so as to overlap each other in the radial direction, the first rotary electric machine 1A and the second rotary electric machine 1B are arranged in the axial direction. It can be placed close to L. As described above, since it is not necessary to provide the support portion of the case 9 between the first rotary electric machine 1A and the second rotary electric machine 1B in the axial direction L, it is easy to realize such a configuration. As described above, according to this configuration, it is possible to further reduce the size of the vehicle drive device 100 in the axial direction L.

The first rotary electric machine 1A includes a first rotor support member 13A connected so as to rotate integrally with the first rotor 12A. The first rotor support member 13A is a member that supports the first rotor 12A. In the present embodiment, the first rotor support member 13A includes a shaft-shaped portion 131A. The axial portion 131A is formed so as to extend along the axial direction L.

The second rotary electric machine 1B includes a second rotor support member 13B connected so as to rotate integrally with the second rotor 12B. The second rotor support member 13B is a member that supports the second rotor 12B. In the present embodiment, the second rotor support member 13B includes a first cylindrical portion 131B, a second tubular portion 132B, and a connecting portion 133B.

Each of the first tubular portion 131B and the second tubular portion 132B is formed in a cylindrical shape extending along the axial direction L. In the present embodiment, the first cylindrical portion 131B has a larger radial dimension than the second tubular portion 132B. The first cylindrical portion 131B is arranged so as to be in contact with the second rotor 12B from the inside in the radial direction R. Further, the second cylindrical portion 132B is arranged inside the radial direction R with respect to the first tubular portion 131B. In the present embodiment, the first cylindrical portion 131B and the second tubular portion 132B are arranged on the first axis X1. That is, the first cylindrical portion 131B and the second tubular portion 132B are arranged coaxially. The connecting portion 133B extends along the radial direction R so as to connect the first cylindrical portion 131B and the second tubular portion 132B.

The first rotor support member 13A is arranged in a state of penetrating the first rotor 12A and the second rotor support member 13B in the axial direction L. In the present embodiment, the axial portion 131A of the first rotor support member 13A is arranged in a state of penetrating the second tubular portion 132B of the second rotor support member 13B in the axial direction L.

As shown in FIG. 1, the input member 21 is formed so as to extend along the axial direction L. In the present embodiment, the input member 21 penetrates the third side wall portion 93a in the axial direction L so as to project from the third side wall portion 93a of the third case member 93 toward the second side L2 in the axial direction.

As shown in FIG. 2, the input member 21 is driven and connected to the internal combustion engine EG. In the present embodiment, the input member 21 is driven and connected to the output shaft (crankshaft or the like) of the internal combustion engine EG via the damper device DP. The damper device DP is a device that attenuates fluctuations in the transmitted torque. In the present embodiment, when an excessive torque is input to the damper device DP from the output side, it is restricted that an excessive load acts on the power transmission path from the pair of output members 22 to the internal combustion engine EG. A torque limiter is provided for this purpose.

Here, in the present application, "driving connection" refers to a state in which two rotating elements are connected so as to be able to transmit a driving force, and a state in which the two rotating elements are connected so as to rotate integrally, or the said. It includes a state in which two rotating elements are mutably connected so that a driving force can be transmitted through one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at different speeds, such as a shaft, a gear mechanism, a belt, and a chain. The transmission member may include an engaging device that selectively transmits rotation and driving force, for example, a friction engaging device, a meshing type engaging device, and the like.

The power transmission mechanism 4 is configured to transmit a driving force between the input member 21, the first rotor 12A, the second rotor 12B, and the output differential gear mechanism 3. As described above, in the present embodiment, the power transmission mechanism 4 includes a distribution differential gear mechanism 5, a reduction differential gear mechanism 6, and a counter gear mechanism 7.

The distribution differential gear mechanism 5 distributes the driving force of the internal combustion engine EG transmitted to the input member 21 to the first rotary electric machine 1A, the second rotary electric machine 1B, and the output differential gear mechanism 3. It is configured. As described above, the vehicle drive device 100 according to the present embodiment is configured as a so-called split type hybrid vehicle drive device.

As shown in FIG. 4, the distribution differential gear mechanism 5 includes a first rotating element E1, a second rotating element E2, and a third rotating element E3. In the present embodiment, the order of the rotational speeds of the rotating elements of the distribution differential gear mechanism 5 is the order of the first rotating element E1, the second rotating element E2, and the third rotating element E3. Further, the distribution differential gear mechanism 5 is a single pinion type planetary gear mechanism.

The first rotating element E1 is driven and connected to the first rotor 12A. In the present embodiment, the first rotating element E1 is the first sun gear S5. The first sun gear S5 is connected to the first rotor 12A so as to rotate integrally. In the illustrated example, the first sun gear S5 has a shaft-shaped portion by spline engagement in a state where the shaft-shaped portion 131A of the first rotor support member 13A is arranged inside the radial direction R with respect to the first sun gear S5. It is connected to 131A.

The second rotating element E2 is drive-connected to the input member 21. In the present embodiment, the second rotating element E2 is a first carrier C5 that rotatably supports the first pinion gear P5 that meshes with the first sun gear S5. The first carrier C5 is connected to the input member 21 so as to rotate integrally. The first pinion gear P5 rotates (rotates) around its axis and rotates (revolves) around the first sun gear S5. A plurality of first pinion gears P5 are provided along the revolution trajectory.

The third rotating element E3 is driven and connected to the second rotor 12B and the output differential gear mechanism 3. In the present embodiment, the third rotating element E3 is the first ring gear R5 that meshes with the first pinion gear P5. In the present embodiment, the first ring gear R5 is connected so as to rotate integrally with the cylindrical gear forming member 51 extending along the axial direction L. In the illustrated example, the first ring gear R5 is integrally formed with the gear forming member 51.

As described above, in the present embodiment, the power transmission mechanism 4 has the first rotating element E1 driven and connected to the first rotor 12A, the second rotating element E2 driven and connected to the input member 21, and the second rotor 12B. And a distribution differential gear mechanism 5 having a third rotating element E3 driven and connected to the output differential gear mechanism 3.
The input member 21 and the distribution differential gear mechanism 5 are arranged coaxially with the first rotary electric machine 1A and the second rotary electric machine 1B.

According to this configuration, by providing the differential gear mechanism 5 for distribution, the internal combustion engine EG is operated at an efficient rotation speed, and the rotation speed of the first rotary electric machine 1A is adjusted according to the vehicle speed. The driving force of the internal combustion engine EG and the first rotary electric machine 1A can be transmitted to the output differential gear mechanism 3 at the rotation speed. Further, the driving force of the second rotary electric machine 1B can be transmitted to the output differential gear mechanism 3 as needed, without going through the distribution differential gear mechanism 5. Further, according to this configuration, the input member 21 and the differential gear mechanism 5 for distribution are arranged coaxially with the first rotary electric machine 1A and the second rotary electric machine 1B. Since the two-rotating electric machine 1B can be arranged close to the axial direction L, it is possible to suppress an increase in the dimension of the vehicle drive device 100 in the axial direction L.

The reduction differential gear mechanism 6 is configured to decelerate the rotation of the second rotor 12B and transmit it to the third rotation element E3 of the distribution differential gear mechanism 5. In the present embodiment, the reduction gear differential mechanism 6 is a single pinion type planetary gear mechanism. Specifically, the reduction differential gear mechanism 6 has a second sun gear S6, a second carrier C6 that supports a second pinion gear P6 that meshes with the second sun gear S6, and a radial radius R of the second sun gear S6. A second ring gear R6, which is arranged on the outside and meshes with the second pinion gear P6, is provided.

In the present embodiment, the second sun gear S6 is an input element of the reduction differential gear mechanism 6, and is connected to the second rotor 12B so as to rotate integrally. In the illustrated example, the second sun gear S6 is integrally formed with the second cylindrical portion 132B of the second rotor support member 13B.

In this embodiment, the second carrier C6 is non-rotatably connected to the case 9. In the illustrated example, the second carrier C6 is fixed to the compartment 92c of the second case member 92. The second pinion gear P6 is rotatably supported by the second carrier C6. A plurality of second pinion gears P6 are provided along the revolution trajectory.

In the present embodiment, the second ring gear R6 is an output element of the reduction differential gear mechanism 6 and is connected so as to rotate integrally with the first ring gear R5 of the distribution differential gear mechanism 5. In the illustrated example, the second ring gear R6 is formed on the inner peripheral surface of the gear forming member 51.

In the present embodiment, the reduction differential gear mechanism 6 is arranged adjacent to the distribution differential gear mechanism 5 between the second rotor 12B and the distribution differential gear mechanism 5 in the axial direction L. .. In the illustrated example, the reduction differential gear mechanism 6 is adjacent to the axial first side L1 with respect to the distribution differential gear mechanism 5, and is adjacent to the axial second side L2 with respect to the second rotor 12B. And are arranged.

As shown in FIG. 1, the counter gear mechanism 7 includes a counter input gear 71, a counter output gear 72, and a counter shaft 73 connected so that they rotate integrally.

The counter input gear 71 is an input element of the counter gear mechanism 7. The counter input gear 71 meshes with the counter drive gear 52. In the present embodiment, the counter drive gear 52 is connected so as to rotate integrally with the gear forming member 51. In the illustrated example, the counter drive gear 52 is formed on the outer peripheral surface of the gear forming member 51.

The counter output gear 72 is an output element of the counter gear mechanism 7. In the present embodiment, the counter output gear 72 is formed to have a smaller diameter than the counter input gear 71. Further, in the present embodiment, the counter output gear 72 is arranged on the first side L1 in the axial direction with respect to the counter input gear 71.

The counter shaft 73 is formed so as to extend along the axial direction L. In the illustrated example, the counter input gear 71 is connected to the counter shaft 73 by spline engagement. The counter output gear 72 is integrally formed with the counter shaft 73.

The output differential gear mechanism 3 is configured to distribute the rotation input to the output differential gear mechanism 3 to the pair of output members 22. In the present embodiment, the output differential gear mechanism 3 includes a differential input gear 31 which is an input element of the output differential gear mechanism 3. The differential input gear 31 meshes with the counter output gear 72 of the counter gear mechanism 7. That is, in the present embodiment, the output differential gear mechanism 3 distributes the rotation of the differential input gear 31 to the pair of output members 22.

In the present embodiment, the arrangement region of the output differential gear mechanism 3 in the axial direction L overlaps with the arrangement region of the distribution differential gear mechanism 5 in the axial direction L. That is, at least a part of the arrangement region of the distribution differential gear mechanism 5 in the axial direction L is included in the arrangement region of the output differential gear mechanism 3 in the axial direction L. In the illustrated example, the arrangement region of the output differential gear mechanism 3 in the axial direction L overlaps with the arrangement region of both the distribution differential gear mechanism 5 and the reduction reduction differential gear mechanism 6 in the axial direction L.

In the present embodiment, the output differential gear mechanism 3 includes a differential case 32, a pair of differential pinion gears 33, and a pair of side gears 34, in addition to the above-mentioned differential input gear 31. Here, the pair of differential pinion gears 33 and the pair of side gears 34 are both bevel gears.

The differential case 32 is connected so as to rotate integrally with the differential input gear 31. The differential case 32 is a hollow member. A pair of differential pinion gears 33 and a pair of side gears 34 are housed inside the differential case 32.

The pair of differential pinion gears 33 are arranged so as to face each other with a distance from each other along the radial direction R with respect to the third axis X3. Each of the pair of differential pinion gears 33 is attached to a differential pinion shaft 33a supported so as to rotate integrally with the differential case 32. Each of the pair of differential pinion gears 33 is configured to be rotatable (rotated) about the differential pinion shaft 33a and rotatable (revolved) about the third axis X3.

The pair of side gears 34 are output elements of the output differential gear mechanism 3. The pair of side gears 34 are arranged so as to face each other with the pair of differential pinion shafts 33a interposed therebetween, spaced apart from each other in the axial direction L. The pair of side gears 34 mesh with the pair of differential pinion gears 33. Each of the pair of side gears 34 is connected so as to rotate integrally with the output member 22.

Each of the pair of output members 22 is drive-connected to the wheel W (see FIG. 2). In the present embodiment, each of the pair of output members 22 is connected so as to rotate integrally with the side gear 34. In the illustrated example, each of the pair of output members 22 is integrally formed with the side gear 34. Further, in the present embodiment, each of the pair of output members 22 is connected so as to rotate integrally with the drive shaft DS which is drive-connected to the wheel W. In the illustrated example, each of the pair of output members 22 is formed in a cylindrical shape having an axial center along the axial direction L, and is arranged inside the radial direction R with respect to the side gear 34. Then, the drive shaft DS is inserted inside the radial direction R with respect to the output member 22, and they are connected to each other by spline engagement.

As shown in FIG. 1, the vehicle drive device 100 rotatably supports the first bearing B1 and the second bearing B2 that rotatably support the first rotor support member 13A, and the second rotor support member 13B. It is equipped with three bearings B3. In the present embodiment, the vehicle drive device 100 includes a fourth bearing B4 that rotatably supports the input member 21, a fifth bearing B5 and a sixth bearing B6 that rotatably support the gear forming member 51, and a counter gear. The seventh bearing B7 and the eighth bearing B8 that rotatably support the counter shaft 73 of the mechanism 7, and the ninth bearing B9 and the tenth bearing B10 that rotatably support the differential case 32 of the output differential gear mechanism 3. And, further equipped.

As shown in FIG. 3, the first bearing B1 is arranged on the first side L1 in the axial direction with respect to the first rotor 12A. The first bearing B1 is supported by the first side wall portion 91c. In the present embodiment, the first bearing B1 is supported from the outside in the radial direction by the first side wall portion 91c. The first bearing B1 rotatably supports the shaft-shaped portion 131A of the first rotor support member 13A from the outside in the radial direction R.

In this example, the first bearing B1 is arranged so as to face the first stepped surface 14a facing the first side L1 in the axial direction formed on the outer peripheral surface 13a of the axial portion 131A from the first side L1 in the axial direction. Has been done. As a result, the first rotor support member 13A is supported in the axial direction L with respect to the first side wall portion 91c via the first bearing B1. As a result, the movement of the first rotor support member 13A to the first side L1 in the axial direction is restricted.

The second bearing B2 is arranged on the second side L2 in the axial direction with respect to the first rotor 12A. The second bearing B2 is supported by the second rotor support member 13B. In the present embodiment, the second bearing B2 is in the radial direction of the outer peripheral surface 13a of the shaft-shaped portion 131A of the first rotor support member 13A and the inner peripheral surface 13b of the second tubular portion 132B of the second rotor support member 13B. It is arranged between R. As described above, the second bearing B2 rotatably supports the first rotor support member 13A with respect to the second rotor support member 13B.

In this example, the second bearing B2 is arranged so as to face the second stepped surface 14b formed on the outer peripheral surface 13a of the axial portion 131A and facing the second axial side L2 from the second axial side L2. Has been done. Further, the second bearing B2 faces the third stepped surface 14c formed on the inner peripheral surface 13b of the second tubular portion 132B and facing the first axial side L1 from the first axial side L1. Have been placed. As will be described later, the second rotor support member 13B is supported in the axial direction L with respect to the partition portion 92c via the third bearing B3. Therefore, the first rotor support member 13A is supported in the axial direction L with respect to the compartment 92c via the second bearing B2, the second rotor support member 13B, and the third bearing B3. As a result, the movement of the first rotor support member 13A to the second side L2 in the axial direction is restricted.

The third bearing B3 is supported by the compartment 92c. In the present embodiment, the partition portion 92c is a cylindrical inner circumference that is outside the radial direction R with respect to the second tubular portion 132B of the second rotor support member 13B and is arranged coaxially with the second tubular portion 132B. It has a surface 92d. The third bearing B3 is arranged between the outer peripheral surface 13c of the second tubular portion 132B and the tubular inner peripheral surface 92d of the partition portion 92c in the radial direction. In the present embodiment, the tubular inner peripheral surface 92d is the inner peripheral surface of the tubular portion formed so as to project to the first side L1 in the axial direction in the compartment 92c. In the illustrated example, the pair of third bearings B3 are arranged adjacent to each other in the axial direction L.

In this example, the pair of third bearings B3 is axially second with respect to each of the pair of fourth stepped surfaces 14d facing the axial second side L2 formed on the outer peripheral surface 13c of the second tubular portion 132B. They are arranged so as to face each other from the side L2. Further, the pair of third bearings B3 face each of the pair of fifth stepped surfaces 14e facing the first side L1 in the axial direction formed on the cylindrical inner peripheral surface 92d from the first side L1 in the axial direction. Is located in. As a result, the second rotor support member 13B is supported in the axial direction L with respect to the partition portion 92c via the pair of third bearings B3. As a result, the movement of the second rotor support member 13B to the second side L2 in the axial direction is restricted. Further, as described above, the first rotor support member 13A is supported in the axial direction L with respect to the first side wall portion 91c via the first bearing B1. Therefore, the second rotor support member 13B is supported in the axial direction L with respect to the first side wall portion 91c via the second bearing B2, the first rotor support member 13A, and the first bearing B1. As a result, the movement of the second rotor support member 13B to the first side L1 in the axial direction is also restricted. In this example, of the pair of third bearings B3, the third bearing B3 on the first side L1 in the axial direction has a larger diameter than the third bearing B3 on the second side L2 in the axial direction. Therefore, each of the 4th stepped surface 14d and the 5th stepped surface 14e is also a two-step stepped surface having a larger diameter on the first side L1 in the axial direction.

As described above, in the present embodiment, the second rotor support member 13B includes the second tubular portion 132B extending along the axial direction L.
The first rotor support member 13A includes a shaft-shaped portion 131A arranged so as to penetrate the second cylindrical portion 132B in the axial direction L.
The partition portion 92c includes a tubular inner peripheral surface 92d that is outside the radial direction R with respect to the second tubular portion 132B and is arranged coaxially with the second tubular portion 132B.
The second bearing B2 is arranged between the outer peripheral surface 13a of the shaft-shaped portion 131A and the inner peripheral surface 13b of the second tubular portion 132B in the radial direction.
The third bearing B3 is arranged between the outer peripheral surface 13c of the second tubular portion 132B and the tubular inner peripheral surface 92d of the partition portion 92c in the radial direction R.

According to this configuration, the shaft-shaped portion 131A of the first rotor support member 13A is passed through the second bearing B2, the second cylindrical portion 132B of the second rotor support member 13B, and the third bearing B3, and the case 9 is provided. Can be appropriately supported in the compartment 92c.

Further, in the present embodiment, the second bearing B2 and the third bearing B3 are inside the radial direction R with respect to the second rotor 12B and overlap with the second rotor 12B in the radial direction along the radial direction R. It is placed in a position. In the illustrated example, a part of the second bearing B2 overlaps with the second rotor 12B in the radial direction. Further, the entire third bearing B3 on the first side L1 in the axial direction overlaps with the second rotor 12B in the radial direction. A part of the third bearing B3 on the second side L2 in the axial direction overlaps with the second rotor 12B in the radial direction.

According to this configuration, the second bearing B2 and the third bearing B3 are arranged by utilizing the space inside the radial direction R with respect to the second rotor 12B and overlapping with the second rotor 12B in the radial direction. can do. Therefore, it is possible to further reduce the size of the vehicle drive device 100 in the axial direction L.

As shown in FIG. 1, the fourth bearing B4 is supported by the third side wall portion 93a. In the present embodiment, the fourth bearing B4 is supported from the outside in the radial direction by the third side wall portion 93a. The fourth bearing B4 rotatably supports the input member 21 from the outside in the radial direction R.

The fifth bearing B5 is supported by the compartment 92c. The sixth bearing B6 is supported by the third side wall portion 93a. In the present embodiment, the fifth bearing B5 is supported from the outside of the radial direction R by the partition portion 92c, and the sixth bearing B6 is supported from the inside of the radial direction R by the third side wall portion 93a. The fifth bearing B5 rotatably supports the gear forming member 51 from the outside in the radial direction R, and the sixth bearing B6 rotatably supports the gear forming member 51 from the inside in the radial direction R.

The seventh bearing B7 is supported by the compartment 92c. The eighth bearing B8 is supported by the third side wall portion 93a. In the present embodiment, the seventh bearing B7 is supported from the outside of the radial direction R by the partition portion 92c, and the eighth bearing B8 is supported from the outside of the radial direction R by the third side wall portion 93a. The seventh bearing B7 and the eighth bearing B8 rotatably support the counter shaft 73 of the counter gear mechanism 7 from the outside in the radial direction R.

The ninth bearing B9 is supported by the second side wall portion 92b. The tenth bearing B10 is supported by the third side wall portion 93a. In the present embodiment, the ninth bearing B9 is supported from the outside of the radial direction R by the second side wall portion 92b, and the tenth bearing B10 is supported from the outside of the radial direction R by the third side wall portion 93a. The ninth bearing B9 and the tenth bearing B10 rotatably support the differential case 32 of the output differential gear mechanism 3 from the outside in the radial direction R.

[Other embodiments]
(1) In the above embodiment, the configuration in which the power transmission mechanism 4 includes the distribution differential gear mechanism 5, the reduction reduction differential gear mechanism 6, and the counter gear mechanism 7 has been described as an example. However, the configuration is not limited to such a configuration, and for example, the power transmission mechanism 4 does not include at least one of the distribution differential gear mechanism 5, the reduction gear differential gear mechanism 6, and the counter gear mechanism 7. It may be.

(2) In the above embodiment, the configuration in which the first side wall portion 91c is provided on the first case member 91 and the partition portion 92c is provided on the second case member 92 has been described as an example. However, without being limited to such a configuration, for example, both the first side wall portion 91c and the partition portion 92c may be provided on the first case member 91.

(3) In the above embodiment, a configuration in which both the first stator 11A and the second stator 11B are fixed to the first case member 91 has been described as an example. However, without being limited to such a configuration, for example, the first stator 11A may be fixed to the first case member 91, and the second stator 11B may be fixed to the second case member 92. Alternatively, both the first stator 11A and the second stator 11B may be fixed to the second case member 92.

(4) In the above embodiment, a part of the second bearing B2, the whole of the third bearing B3 on the first side L1 in the axial direction, and a part of the third bearing B3 on the second side L2 in the axial direction are radial. A configuration that visually overlaps with the second rotor 12B has been described as an example. However, without being limited to such a configuration, for example, one of the pair of third bearings B3 may not overlap with the second rotor 12B in the radial direction. Further, the second bearing B2 does not have to overlap with the second rotor 12B in the radial direction. Further, the second bearing B2 and the pair of third bearings B3 do not have to overlap with the second rotor 12B in the radial direction.

(5) In the above embodiment, the first coil end portion 112A is inside or outside the radial direction R with respect to the second coil end portion 112B, and the second coil end is radially viewed along the radial direction R. The configuration arranged at the position overlapping with the part 112B has been described as an example. However, the configuration is not limited to such a configuration, and the first coil end portion 112A may be configured so as not to overlap with the second coil end portion 112B in the radial direction.

(6) In the above embodiment, the distribution differential gear mechanism 5 is a single pinion type planetary gear mechanism, the first rotating element E1 is the first sun gear S5, and the second rotating element E2 is the first carrier C5. The configuration in which the third rotating element E3 is the first ring gear R5 has been described as an example. However, this configuration is merely an example, and the specific configuration of the planetary gear mechanism and the allocation of the first rotating element E1, the second rotating element E2, and the third rotating element E3 can be appropriately changed. For example, the differential gear mechanism 5 for distribution is a double pinion type planetary gear mechanism, the first rotating element E1 is the first sun gear S5, the second rotating element E2 is the first ring gear R5, and the third rotating element. The configuration may be such that E3 is the first carrier C5.

(7) The configurations disclosed in each of the above-described embodiments can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction. With respect to other configurations, the embodiments disclosed herein are merely exemplary in all respects. Therefore, various modifications can be appropriately made without departing from the spirit of the present disclosure.

The technique according to the present disclosure can be used in a vehicle drive device including two rotary electric machines and a differential gear mechanism for output.

100: Vehicle drive device, 1A: 1st rotary electric machine, 11A: 1st stator, 12A: 1st rotor, 13A: 1st rotor support member, 1B: 2nd rotary electric machine, 11B: 2nd stator, 12B: 1st 2 rotors, 13B: 2nd rotor support member, 21: input member, 22: output member, 3: differential gear mechanism for output, 4: power transmission mechanism, 9: case, 9A: 1st chamber, 9B: 2nd Chamber, 91c: 1st side wall (side wall), 92c: partition, B1: 1st bearing, B2: 2nd bearing, B3: 3rd bearing, EG: internal combustion engine, W: wheel, L: axial direction, L1: 1st side in axial direction, L2: 2nd side in axial direction, R: radial direction

Claims (6)

The input member that is driven and connected to the internal combustion engine and
A pair of output members that are driven and connected to the wheels, respectively.
A first rotary electric machine having a first stator and a first rotor arranged inside the first stator in the radial direction.
A second rotary electric machine having a second stator and a second rotor arranged inside the second stator in the radial direction.
An output differential gear mechanism that distributes the input rotation to the pair of output members,
A power transmission mechanism that transmits a driving force between the input member, the first rotor, the second rotor, and the output differential gear mechanism, and
A case for accommodating the first rotary electric machine, the second rotary electric machine, the output differential gear mechanism, and the power transmission mechanism is provided.
The first rotary electric machine and the second rotary electric machine are arranged coaxially.
The output differential gear mechanism is arranged on a shaft separate from the first rotary electric machine and the second rotary electric machine.
The first rotary electric machine includes a first rotor support member connected so as to rotate integrally with the first rotor.
The second rotary electric machine includes a second rotor support member connected so as to rotate integrally with the second rotor.
The first rotor support member is arranged so as to penetrate the first rotor and the second rotor support member in the axial direction.
One side in the axial direction is the first side in the axial direction, and the other side is the second side in the axial direction.
A first bearing, which is arranged on the first side in the axial direction with respect to the first rotor and rotatably supports the first rotor support member,
A second bearing, which is arranged on the second side in the axial direction with respect to the first rotor and rotatably supports the first rotor support member,
A third bearing that rotatably supports the second rotor support member is further provided.
The first rotor is arranged on the first side in the axial direction with respect to the second rotor.
The case includes the first chamber in which the first rotary electric machine and the second rotary electric machine are housed, the differential gear mechanism for output, and the differential gear mechanism for output, which are arranged on the second side in the axial direction with respect to the first chamber. A second chamber in which a power transmission mechanism is housed, a partition portion for partitioning the first chamber and the second chamber in the axial direction, and a first chamber in the axial direction of the first chamber. With a side wall provided to cover the side,
The first bearing is supported by the side wall portion and is supported by the side wall portion.
The second bearing is supported by the second rotor support member, and the second bearing is supported by the second rotor support member.
A vehicle drive device in which the third bearing is supported by the compartment. The case includes a first case member and a second case member joined to the first case member from the axial second side.
The side wall portion is provided on the first case member.
The section is provided on the second case member.
The vehicle drive device according to claim 1, wherein the first stator and the second stator are fixed to the first case member. The second rotor support member includes a cylindrical portion extending along the axial direction.
The first rotor support member includes a shaft-shaped portion arranged in a state of penetrating the cylindrical portion in the axial direction.
The compartment includes a tubular inner peripheral surface that is radially outside the tubular portion and is arranged coaxially with the tubular portion.
The second bearing is arranged between the outer peripheral surface of the shaft-shaped portion and the inner peripheral surface of the tubular portion in the radial direction.
The vehicle drive device according to claim 1 or 2, wherein the third bearing is arranged between the outer peripheral surface of the tubular portion and the tubular inner peripheral surface of the compartment in the radial direction. The second bearing and the third bearing are arranged at positions inside the second rotor in the radial direction and overlapping the second rotor in a radial direction along the radial direction. The vehicle drive device according to any one of claims 1 to 3. The power transmission mechanism is driven and connected to the first rotating element driven and connected to the first rotor, the second rotating element driven and connected to the input member, and the second rotor and the output differential gear mechanism. With a third rotating element and a differential gear mechanism for distribution,
The vehicle drive device according to any one of claims 1 to 4, wherein the input member and the distribution differential gear mechanism are arranged coaxially with the first rotary electric machine and the second rotary electric machine. The first stator includes a first stator core and a cylindrical first coil end portion which is a coil portion protruding in the axial direction from the first stator core.
The second stator includes a second stator core and a tubular second coil end portion which is a coil portion protruding in the axial direction from the second stator core.
The first coil end portion is arranged at a position that is inside or outside the radial direction of the second coil end portion and overlaps with the second coil end portion in a radial direction along the radial direction. The vehicle drive device according to any one of claims 1 to 5.

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