JP2020159216A - Vehicular drive device - Google Patents

Abstract

To provide a vehicular drive device having structure in which the accuracy of supporting a rotating member connected in a driven manner to a drive force source can be easily improved.SOLUTION: The vehicular drive device comprises a case 5 housing a hydraulic pump 6, a pump cover 7 and a rotation member RT, the case 5 comprises a case portion 51 in which an opening 51a opened toward a first side L1 in an axial direction is formed, and a second case portion 52 joined to the first case portion 51 to close the opening 51a. The pump cover 7 is fixed to the second case portion 52 from a second side L2 in the axial direction in such a way that the hydraulic pump 6 is arranged between the pump cover 7 and the second case portion 52. A bearing BR rotatably supporting the rotation member RT is arranged at the second side L2 in the axial direction with respect to the pump cover 7, the second case portion 52 comprises a support portion 521 extending to the second side L2 in the axial direction at the outside of a radial direction R rather than the pump cover 7, and the support portion 521 supports the bearing BR in the radial direction R.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle drive device including a driving force source for driving wheels, a hydraulic pump, a pump cover covering the hydraulic pump, and a case for accommodating them.

An example of such a vehicle drive device is disclosed in Patent Document 1 below. Hereinafter, in the description of this background technique, the reference numerals in Patent Document 1 are quoted in parentheses.

In the vehicle drive device of Patent Document 1, the pump cover (58) is fixed to the case (44) so as to cover the hydraulic pump (10), and between the pump cover (58) and the case (44). A flat plate (60) is interposed. The plate (60) is arranged so as to cover the groove (44a) formed on the inner surface of the case (44). In this way, the plate (60) and the groove (44a) form an oil passage.

Japanese Unexamined Patent Publication No. 2013-117218 (Fig. 3)

As described above, in the vehicle drive device of Patent Document 1, the pump cover (58) is fixed to the case (44) via the plate (60). Further, a bearing (72) that rotatably supports the rotating member (70) driven and connected to the driving force source (MG2) is supported by the pump cover (58).

As described above, in the vehicle drive device of Patent Document 1, the bearing (72) that rotatably supports the rotating member (70) is provided by the case (44) via the pump cover (58) and the plate (60). Is supported by. Therefore, it is difficult to improve the support accuracy of the rotating member (70).

Therefore, it is desired to realize a vehicle drive device having a structure that makes it easy to increase the support accuracy of the rotating member that is driven and connected to the driving force source.

In view of the above, the characteristic configuration of the vehicle drive device is
A driving force source for driving the wheels,
With a hydraulic pump
A pump cover that covers the hydraulic pump and
A rotating member that is driven and connected to the driving force source,
The hydraulic pump, the pump cover, and a case for accommodating the rotating member are provided.
One side in the axial direction of the rotating member is the first side in the axial direction, and the other side in the axial direction is the second side in the axial direction.
The case includes a first case portion formed with an opening that opens toward the first side in the axial direction, and a second case portion joined to the first case portion so as to close the opening. Prepare,
The pump cover is fixed to the second case portion from the second side in the axial direction so that the hydraulic pump is arranged between the pump cover and the second case portion.
A bearing that rotatably supports the rotating member is arranged on the second side in the axial direction with respect to the pump cover.
The second case portion includes a support portion extending radially to the second side in the radial direction outside the pump cover.
The support portion is at a point where the bearing is supported in the radial direction.

According to this characteristic configuration, a support portion extending radially to the second side with respect to the pump cover is provided in the second case portion on the outer side in the radial direction from the pump cover. Then, the bearing arranged on the second side in the axial direction with respect to the pump cover is supported in the radial direction by the support portion. That is, the bearing is directly supported by the second case portion. As a result, it is possible to realize a vehicle drive device having a structure in which the support accuracy of the rotating member driven and connected to the driving force source can be easily increased.

Skeleton diagram of the vehicle drive device according to the embodiment A cross-sectional view along an axial direction showing a main part of a vehicle drive device according to an embodiment.

Hereinafter, the vehicle drive device 100 according to the embodiment will be described with reference to the drawings. As shown in FIG. 1, the vehicle driving device 100 includes a driving force source 1 for driving the wheels W. In the present embodiment, the vehicle drive device 100 is configured as a drive device for a so-called two-motor split type hybrid vehicle. That is, in the present embodiment, the driving force source 1 includes the internal combustion engine EN, the first rotary electric machine MG1, and the second rotary electric machine MG2.

In the following description, unless otherwise specified, "axial direction L" and "diameter direction R" are defined with reference to the first rotor shaft Ros1 of the first rotary electric machine MG1. Then, one side of the axial direction L (left side in FIG. 1) is referred to as "axial first side L1", and the other side of axial direction L (right side in FIG. 1) is referred to as "axial second side L2".

The internal combustion engine EN is a prime mover (gasoline engine, diesel engine, etc.) that is driven by combustion of fuel to extract power. The output shaft (crankshaft, etc.) of the internal combustion engine EN is drive-connected to the input shaft Si. It is preferable that the output shaft of the internal combustion engine EN is driven and connected to the input shaft Si via a damper (not shown) that attenuates fluctuations in the transmitted torque.

The first rotary electric machine MG1 has a function as a motor (electric 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 MG1 is electrically connected to a power storage device (not shown). As this power storage device, various known power storage devices such as batteries and capacitors can be used. In the present embodiment, the first rotary electric machine MG1 is a generator that generates electric power by the torque of the input shaft Si (internal combustion engine EN), charges the power storage device, or supplies electric power for driving the second rotary electric machine MG2. Function. However, the first rotary electric machine MG1 may function as a motor that powers and generates a driving force (synonymous with "torque") when the vehicle is traveling at high speed or when the internal combustion engine EN is started.

The first rotary electric machine MG1 includes a first stator St1 fixed to a non-rotating member (for example, a case 5 described later) and a first rotor Ro1 rotatably supported by the first stator St1. ing. In the present embodiment, the first rotor Ro1 is arranged inside the radial direction R with respect to the first stator St1. The first rotor shaft Ros1 is connected to the first rotor Ro1 so as to rotate integrally.

The first rotor shaft Ros1 is formed in a cylindrical shape extending along the axial direction L. The first rotor shaft Ros1 corresponds to a "rotating member RT" that is driven and connected to the driving force source 1. The first rotor shaft Ros1 is rotatably supported by the first bearing B1 and the second bearing B2. The first bearing B1 is arranged on the first side L1 in the axial direction with respect to the first rotor Ro1. The first bearing B1 corresponds to a "bearing BR" that rotatably supports the rotating member RT. The second bearing B2 is arranged on the second side L2 in the axial direction with respect to the first rotor Ro1.

The second rotary electric machine MG2 has a function as a motor (electric 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 MG2 is also electrically connected to the above-mentioned power storage device. In the present embodiment, the second rotary electric machine MG2 mainly functions as a motor that generates a driving force for traveling the vehicle. However, when the vehicle is decelerating or the like, the second rotary electric machine MG2 may function as a generator that regenerates the inertial force of the vehicle as electric energy.

The second rotary electric machine MG2 includes a second stator St2 fixed to a non-rotating member (for example, case 5 described later) and a second rotor Ro2 rotatably supported by the second stator St2. ing. A second rotor shaft Ros2 extending along the axial direction L is connected to the second rotor Ro2. In the present embodiment, the second rotor Ro2 is arranged inside the radial direction R with respect to the second stator St2 with respect to the second rotor shaft Ros2.

As shown in FIG. 1, in the present embodiment, the power transmission path T connecting the driving force source 1 and the wheel W is provided with a power distribution mechanism 2, a counter gear mechanism 3, and a differential gear mechanism 4. Has been done.

The power distribution mechanism 2 distributes and transmits the torque of the internal combustion engine EN transmitted to the input shaft Si to the first rotary electric machine MG1 and the counter gear mechanism 3. In the present embodiment, the power distribution mechanism 2 is a single pinion type planetary gear mechanism. That is, the power distribution mechanism 2 includes a sun gear 2S, a ring gear 2R, a carrier 2C, and a pinion gear 2P.

The sun gear 2S is connected so as to rotate integrally with the first rotor shaft Ros1 of the first rotary electric machine MG1. The ring gear 2R is arranged outside the sun gear 2S in the radial direction R. The ring gear 2R is formed on the inner peripheral surface of the cylindrical gear forming member 21. The carrier 2C rotates about the axis (sun gear 2S) of the power distribution mechanism 2. The carrier 2C is connected so as to rotate integrally with the input shaft Si. The pinion gear 2P is arranged between the sun gear 2S and the ring gear 2R so as to mesh with each other. The pinion gear 2P rotates (rotates) around its axis and rotates (revolves) around the sun gear 2S together with the carrier 2C. A plurality of pinion gears 2P are provided along the revolution trajectory at intervals from each other.

In the present embodiment, the torque in the positive direction of the internal combustion engine EN is transmitted to the carrier 2C via the input shaft Si, and the torque in the negative direction output by the first rotary electric machine MG1 is transmitted to the sun gear 2S. The reaction force of the torque of the internal combustion engine EN is supported by the torque in the negative direction of the first rotary electric machine MG1. As a result, the power distribution mechanism 2 transmits a part of the torque of the internal combustion engine EN transmitted to the carrier 2C via the input shaft Si to the first rotary electric machine MG1, and the remaining torque is transmitted to the first rotary electric machine MG1 via the ring gear 2R. It is transmitted to the gear forming member 21.

As described above, the ring gear 2R is formed on the inner peripheral surface of the gear forming member 21. On the other hand, a counter drive gear 2D that meshes with the counter input gear 32 of the counter gear mechanism 3 described later is formed on the outer peripheral surface of the gear forming member 21. As a result, the torque transmitted to the gear forming member 21 via the ring gear 2R of the power distribution mechanism 2 is output to the counter gear mechanism 3 via the counter drive gear 2D.

The counter gear mechanism 3 transmits the torque transmitted from the counter drive gear 2D to the differential gear mechanism 4. The counter gear mechanism 3 includes a counter shaft 31, a counter input gear 32, and a counter output gear 33.

The counter shaft 31 supports them so as to rotate integrally with the counter input gear 32 and the counter output gear 33. The counter input gear 32 is an input element of the counter gear mechanism 3. The counter input gear 32 meshes with the counter drive gear 2D formed on the outer peripheral surface of the gear forming member 21. Further, in the present embodiment, the counter input gear 32 is connected so as to rotate integrally with the second rotor shaft Ros2 of the second rotary electric machine MG2 at a position different from that of the counter drive gear 2D in the circumferential direction thereof. It also meshes with the rotary electric machine output gear OG. The counter output gear 33 is an output element of the counter gear mechanism 3. The counter output gear 33 is arranged coaxially with the counter input gear 32. In the present embodiment, the counter output gear 33 is arranged on the second side L2 in the axial direction with respect to the counter input gear 32. Further, in the present embodiment, the counter output gear 33 is formed to have a smaller diameter than the counter input gear 32.

The differential gear mechanism 4 includes a differential input gear 41 that meshes with the counter output gear 33 of the counter gear mechanism 3. The differential gear mechanism 4 distributes and transmits the torque transmitted to the differential input gear 41 to the pair of wheels W via the pair of output shafts So. In FIG. 1, of the pair of wheels W, the wheel W on the first side L1 in the axial direction is not shown.

As shown in FIG. 2, the vehicle drive device 100 includes a case 5, a hydraulic pump 6, and a pump cover 7.

The case 5 houses the hydraulic pump 6, the pump cover 7, and the first rotor shaft Ros1. In the present embodiment, the case 5 also houses the first rotary electric machine MG1 and the second rotary electric machine MG2, the power distribution mechanism 2, the counter gear mechanism 3, and the differential gear mechanism 4 (see FIG. 1).

As shown in FIG. 2, the case 5 includes a first case portion 51 and a second case portion 52. The first case portion 51 has an opening 51a that opens toward the first side L1 in the axial direction. The second case portion 52 is joined to the first case portion 51 so as to close the opening 51a. In the present embodiment, the first case portion 51 and the second case portion 52 are joined to each other by a case joining member 53 such as a bolt.

A cover fixing surface 52a to which the pump cover 7 is fixed is formed on the surface of the second case portion 52 on the second side L2 in the axial direction. The cover fixing surface 52a is formed along the radial direction R. In the present embodiment, the pump cover 7 is arranged so as to be in direct contact with the cover fixing surface 52a. That is, in the present embodiment, the pump cover 7 is joined to the second case portion 52 so as to be in direct contact with the second case portion 52.

The second case portion 52 includes a support portion 521 extending outward from the pump cover 7 in the radial direction R and extending to the second side L2 in the axial direction. The support portion 521 supports the first bearing B1 in the radial direction R. In the present embodiment, the support portion 521 is formed in a cylindrical shape extending in the axial direction L, and the first bearing B1 is supported by the inner peripheral surface of the support portion 521.

The hydraulic pump 6 is a pump that pumps up the oil stored in the case 5 and supplies the oil to the lubrication target and the cooling target in the case 5. In the present embodiment, the hydraulic pump 6 is driven by a driving force transmitted through a power transmission path T connecting the driving force source 1 and the wheels W. Further, in the present embodiment, the hydraulic pump 6 is arranged coaxially with the input shaft Si and the first rotary electric machine MG1.

The hydraulic pump 6 includes a rotor 61. The rotor 61 is driven by the rotation of the pump drive shaft Sp. The pump drive shaft Sp extends along the axial direction L. In the present embodiment, the pump drive shaft Sp is arranged inside the radial direction R with respect to the first rotor shaft Ros1 of the first rotary electric machine MG1. Further, the pump drive shaft Sp is connected so as to rotate integrally with the input shaft Si. Specifically, the end of the pump drive shaft Sp on the second side in the axial direction L2 is connected to the end of the input shaft Si on the first side in the axial direction L1. Therefore, the hydraulic pump 6 is driven by the rotation of the input shaft Si (internal combustion engine EN).

In this embodiment, the hydraulic pump 6 is an internal gear pump. Therefore, the rotor 61 includes an inner rotor 611 and an outer rotor 612.

The inner rotor 611 is connected so as to rotate integrally with the pump drive shaft Sp. Specifically, the inner rotor 611 is formed with a through hole penetrating in the axial direction L, and the end portion of the pump drive shaft Sp on the first side L1 in the axial direction is fitted into the through hole.

The outer rotor 612 is arranged outside the radial direction R with respect to the inner rotor 611. The internal teeth formed on the inner peripheral surface of the outer rotor 612 mesh with the external teeth formed on the outer peripheral surface of the inner rotor 611. In this way, the inner rotor 611 rotates with the rotation of the pump drive shaft Sp, so that the outer rotor 612 also rotates.

In this embodiment, the rotor 61 is housed in the rotor housing chamber 522. The rotor accommodating chamber 522 is formed in the second case portion 52. Specifically, the rotor accommodating chamber 522 is formed so as to be recessed from the cover fixing surface 52a of the second case portion 52 to the first side L1 in the axial direction. The rotor accommodating chamber 522 is formed in a cylindrical shape. Specifically, the rotor accommodating chamber 522 has a cylindrical inner peripheral surface 522a formed by the second case portion 52 that surrounds the outside of the rotor 61 in the radial direction R, and an axial first side L1 of the rotor 61. It is surrounded by a flat side wall surface 522b that covers it. An oil suction port 522c and an oil discharge port 522d are formed on the side wall surface 522b. The rotor accommodating chamber 522 is formed so that the rotor 61 slides on the inner surface (inner peripheral surface 522a and side wall surface 522b) of the second case portion 52 forming the rotor accommodating chamber 522. In the present embodiment, the axial L dimension of the rotor accommodating chamber 522 is the same as the axial L dimension of the rotor 61. That is, the rotor 61 is completely accommodated in the rotor accommodating chamber 522 of the second case portion 52. Therefore, in the present embodiment, the rotor accommodating chamber for accommodating the rotor 61 is not formed in the pump cover 7.

The pump cover 7 is arranged so as to cover the hydraulic pump 6 and is fixed to the second case portion 52. Specifically, the pump cover 7 is arranged so as to cover the rotor accommodating chamber 522 and the rotor 61. The pump cover 7 is fixed to the second case portion 52 from the second side L2 in the axial direction so that the hydraulic pump 6 is arranged between the pump cover 7 and the second case portion 52. In the present embodiment, the pump cover 7 is arranged on the first side L1 in the axial direction with respect to the first bearing B1. In other words, the first bearing B1 is arranged on the second side L2 in the axial direction with respect to the pump cover 7. The arrangement relationship of the first bearing B1 (bearing BR) and the pump cover 7 in the axial direction L defines the relationship in the region where they overlap in the axial direction along the axial direction L. Therefore, in a region where the first bearing B1 and the pump cover 7 do not overlap in the axial direction (for example, inside the radial direction R of the first bearing B1), a part of the pump cover 7 and the first bearing B1 It may be formed so as to extend to the position of the same axial direction L, or to extend to the second side L2 in the axial direction from the first bearing B1. Also in this embodiment, a part of the tubular portion 72 of the pump cover 7 is arranged so as to overlap the first bearing B1 in the radial direction along the radial direction R.

In the present embodiment, the pump cover 7 is fixed to the second case portion 52 by the fastening member 8. In the illustrated example, the fastening member 8 includes a bolt 81 that is screwed into the bolt hole of the second case portion 52 through the through hole of the pump cover 7. In the present embodiment, the fastening member 8 is arranged inside the support portion 521 in the radial direction R and on the first side L1 in the axial direction with respect to the first bearing B1. As described above, the fastening member 8 is arranged in a relatively narrow region inside the radial direction R with respect to the support portion 521. As a result, the number of fastening members 8 can be reduced, and the time required for assembling the second case portion 52 with the hydraulic pump 6 and the pump cover 7 can be shortened. In the illustrated example, the knock pin 82 is inserted into the knock hole formed on the facing surface of the second case portion 52 and the pump cover 7 in order to position the pump cover 7 with respect to the second case portion 52. There is.

Further, in the present embodiment, the pump cover 7 has a plate-shaped portion 71 and a tubular portion 72. In the illustrated example, the plate-shaped portion 71 and the tubular portion 72 are integrally formed.

The plate-shaped portion 71 is formed in an annular plate shape extending outward in the radial direction R with respect to the tubular portion 72. The plate-shaped portion 71 is a portion that covers the rotor accommodating chamber 522 and the rotor 61. In the present embodiment, recesses corresponding to the oil suction port 522c and the oil discharge port 522d are formed on the surface of the plate-shaped portion 71 on the first side L1 in the axial direction. The plate-shaped portion 71 is configured to be attached to the second case portion 52 by the fastening member 8. In the illustrated example, the plate-shaped portion 71 is formed with a through hole for inserting the bolt 81 and a knock hole for press-fitting the knock pin 82.

The tubular portion 72 is formed in a cylindrical shape extending along the axial direction L. The tubular portion 72 is provided on the second side L2 in the axial direction with respect to the plate-shaped portion 71. Further, the tubular portion 72 is arranged inside the first bearing B1 in the radial direction R. A part of the tubular portion 72 is arranged so as to overlap the first bearing B1 in a radial direction along the radial direction R. A pump drive shaft Sp is inserted inside the radial direction R with respect to the tubular portion 72. The tubular portion 72 rotatably supports the pump drive shaft Sp via a slide bearing 72a such as a bush.

In the present embodiment, as described above, the oil suction port 522c and the oil discharge port 522d are formed in the second case portion 52. The suction port 522c communicates with the suction oil passage 52b formed in the second case portion 52. Although not shown, the suction oil passage 52b communicates with the oil storage portion formed in the case 5 via a strainer. On the other hand, the discharge port 522d communicates with the discharge oil passage 52c formed in the second case portion 52. The discharge oil passage 52c also communicates with the in-shaft oil passage Spa formed so as to penetrate the pump drive shaft Sp in the axial direction L. In such a configuration, the rotor 61 housed in the rotor housing chamber 522 is driven via the pump drive shaft Sp, so that oil is supplied to the discharge oil passage 52c. Then, a part of the oil supplied to the discharge oil passage 52c flows to the in-shaft oil passage Spa, and is supplied from there to various lubrication targets such as gear meshing portions of each portion of the power transmission path T. In addition, the oil supplied to the discharge oil passage 52c is also supplied to the cooling target of the first rotary electric machine MG1 and the second rotary electric machine MG2.

[Other Embodiments]
(1) In the above embodiment, a configuration in which the rotor 61 is completely accommodated in the rotor accommodating chamber 522 of the second case portion 52 has been described as an example. However, the configuration is not limited to such a configuration, and a part of the rotor 61 may project from the rotor accommodating chamber 522 toward the second side L2 in the axial direction. In such a configuration, it is preferable that the pump cover 7 also has a rotor accommodating chamber for accommodating the rotor 61. Further, the rotor accommodating chamber 522 may not be formed in the second case portion 52, and the rotor 61 may be accommodated in the rotor accommodating chamber of the pump cover 7.

(2) In the above embodiment, a configuration in which the pump cover 7 is joined to the second case portion 52 so as to be in direct contact with the second case portion 52 has been described as an example. However, the structure is not limited to such a structure, and the pump cover 7 may be fixed to the second case portion 52 via another member such as a flat plate-shaped member.

(3) In the above embodiment, a configuration in which the support portion 521 is formed in a cylindrical shape has been described as an example. However, if the bearing BR can be supported in the radial direction R, the shape of the support portion 521 is not limited to the cylindrical shape. For example, the support portion 521 may be arranged only in a part of the circumferential direction. Further, in the above embodiment, the configuration in which the bearing BR is supported by the inner peripheral surface of the support portion 521 has been described as an example, but the present invention is not limited to this, and for example, the bearing BR is supported by the outer peripheral surface of the support portion 521. It may be a supported configuration.

(4) In the above embodiment, the fastening member 8 for fixing the pump cover 7 to the second case portion 52 is inside the radial direction R with respect to the support portion 521 and is axial with respect to the bearing BR. The configuration arranged on the first side L1 has been described as an example. However, the present invention is not limited to this, and the fastening member 8 may be arranged outside the radial direction R with respect to the support portion 521. In this case, for example, a portion extending outward in the radial direction R from the support portion 521 may be formed on a part of the pump cover 7, and the portion may be fixed by the fastening member 8. Further, the fastening member 8 may be arranged on the second side L2 in the axial direction with respect to the bearing BR.

(5) In the above embodiment, the configuration in which the pump cover 7 is fixed to the second case portion 52 by the fastening member 8 has been described as an example. However, the structure for fixing the pump cover 7 to the second case portion 52 is not limited to this. For example, another member fixed to the second case portion 52 may be used, and the pump cover 7 may be sandwiched and fixed in the axial direction L between the member and the second case portion 52.

(6) In the above embodiment, the configuration in which the hydraulic pump 6 is arranged coaxially with the first rotary electric machine MG1 has been described as an example, but the present invention is not limited to this. For example, the hydraulic pump 6 may be arranged coaxially with the counter gear mechanism 3, coaxially with the second rotary electric machine MG2, or coaxially with the differential gear mechanism 4. Alternatively, the hydraulic pump 6 may be arranged on a shaft different from any of the first rotary electric machine MG1, the counter gear mechanism 3, the second rotary electric machine MG2, and the differential gear mechanism 4. When the drive source member (input shaft Si in the above embodiment) for transmitting the driving force to the hydraulic pump 6 and the pump drive shaft Sp are arranged on different shafts, the drive source member and the pump drive shaft Sp Is preferably driven and connected via a drive transmission mechanism such as a gear mechanism or a chain transmission mechanism.

(7) In the above embodiment, the configuration in which the pump drive shaft Sp is connected so as to rotate integrally with the input shaft Si has been described as an example, but the drive source member for transmitting the driving force to the hydraulic pump 6 is the input shaft. It is not limited to Si. For example, the drive source member includes a counter shaft 31 of the counter gear mechanism 3, a differential input gear 41 of the differential gear mechanism 4, a second rotor shaft Ros2 of the second rotary electric machine MG2, and a first rotor shaft of the first rotary electric machine MG1. It may be Ros1 or the like. Further, the pump drive shaft Sp is not limited to a configuration in which the pump drive shaft Sp is connected so as to rotate integrally with these drive force source members, and drive transmission of a gear mechanism, a chain transmission mechanism, or the like is provided to these drive force source members. It may be driven and connected via a mechanism.

(8) In the above embodiment, the configuration in which the rotating member RT supported by the bearing BR is the first rotor shaft Ros1 has been described as an example, but the present invention is not limited thereto. For example, the rotating member RT may be a member such as a shaft or a gear that constitutes the counter gear mechanism 3, the second rotor Ro2 of the second rotating electric machine MG2, the differential gear mechanism 4, and the like.

(9) In the above embodiment, a configuration in which the vehicle drive device 100 is a drive device for a so-called two-motor split type hybrid vehicle has been described as an example. However, without being limited to such a configuration, the vehicle drive device 100 is, for example, a drive device for an electric vehicle, a drive device for a parallel hybrid vehicle, a drive device for a series hybrid vehicle, or the like. Is also good. Alternatively, the vehicle drive device 100 may be a drive device including only the internal combustion engine EN as the drive force source 1 for driving the wheels W. In either case, the hydraulic pump 6 is driven by a driving force transmitted from any of the drive source members included in the drive, and the rotating member RT and the bearing BR are also driven by any of the rotations of these drive. It is a bearing BR that supports the member RT and the rotating member RT.

(10) 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 made as appropriate without departing from the gist of the present disclosure.

[Outline of the above embodiment]
The outline of the vehicle drive device (100) described above will be described below.

The vehicle drive device (100)
The driving force source (1) for driving the wheels (W) and
Hydraulic pump (6) and
A pump cover (7) covering the hydraulic pump (6) and
A rotating member (RT) driven and connected to the driving force source (1),
A case (5) for accommodating the hydraulic pump (6), the pump cover (7), and the rotating member (RT) is provided.
One side of the rotating member (RT) in the axial direction (L) is set as the first side in the axial direction (L1), and the other side in the axial direction (L) is set as the second side in the axial direction (L2).
The case (5) has a first case portion (51) having an opening (51a) that opens toward the first side (L1) in the axial direction, and the case (51a) is closed so as to close the opening (51a). A second case portion (52) joined to the first case portion (51) is provided.
The pump cover (7) is from the axial second side (L2) so that the hydraulic pump (6) is arranged between the pump cover (7) and the second case portion (52). It is fixed to the second case portion (52) and
A bearing (BR) that rotatably supports the rotating member (RT) is arranged on the second side (L2) in the axial direction with respect to the pump cover (7).
The second case portion (52) includes a support portion (521) extending radially to the second side (L2) outside the pump cover (7) in the radial direction (R).
The support portion (521) supports the bearing (BR) in the radial direction (R).

According to this configuration, a support portion (521) extending in the second axial direction (L2) with respect to the pump cover (7) is located outside the pump cover (7) in the radial direction (R). It is provided in the two case portion (52). A bearing (BR) arranged on the second side (L2) in the axial direction with respect to the pump cover (7) is supported in the radial direction (R) by the support portion (521). That is, the bearing (BR) is directly supported by the second case portion (52). As a result, it is possible to realize a vehicle drive device (100) having a structure that makes it easy to increase the support accuracy of the rotating member (RT) that is driven and connected to the driving force source (1).

Here, it is preferable that the second case portion (52) is provided with a rotor accommodating chamber (522) for accommodating the rotor (61) of the hydraulic pump (6).

The second case portion (52) has a larger radial (R) dimension than the pump cover (7). Therefore, the work of assembling the second case portion (52), the hydraulic pump (6), and the pump cover (7) is performed on the second case portion (52) with the inner surface of the second case portion (52) facing up. On the other hand, it is common to assemble the pump cover (7) and the rotor (61) from above. In this case, in the configuration in which the pump cover (7) is provided with the rotor accommodating chamber, the pump cover (7) and the pump cover (7) and the pump cover (7) are held so that the rotor (61) does not fall off after the rotor (61) is assembled to the pump cover (7). It is necessary to assemble the rotor (61) to the second case portion (52). According to this configuration, since the second case portion (52) includes the rotor accommodating chamber (522), the hydraulic pump (6) is supplied to the rotor accommodating chamber (522) of the second case portion (52) during such assembly work. ) Rotor (61) can be arranged. As a result, the assembly work can be easily performed.
Further, in the configuration in which the pump cover (7) is provided with the rotor accommodating chamber, the rotor (61) does not fall off from the pump cover (7) by using a holding member such as a flat plate in order to facilitate the assembly work. It may be a sub-assy held as such. According to this configuration, since the assembling work can be easily performed without using such a holding member, there is an advantage that the number of parts can be reduced.

Further, a fastening member (8) for fixing the pump cover (7) to the second case portion (52) is provided.
The fastening member (8) is arranged inside the radial direction (R) with respect to the support portion (521) and on the axial first side (L1) with respect to the bearing (BR). It is preferable to have it.

According to this configuration, the fastening member (8) is arranged in a relatively narrow area inside the support portion (521) in the radial direction (R), and the pump cover (7) is attached to the second case portion (52). Can be properly fixed to.

Further, it is preferable that the pump cover (7) is joined to the second case portion (52) so as to be in direct contact with the second case portion (52).

According to this configuration, no other member is interposed between the pump cover (7) and the second case portion (52). As a result, the number of parts can be reduced, and the manufacturing cost of the vehicle drive device (100) can be reduced.

The hydraulic pump is preferably configured to be driven by a driving force transmitted through a power transmission path (T) connecting the driving force source (1) and the wheels (W).

The technology according to the present disclosure can be used in a vehicle drive device including a driving force source for driving wheels, a hydraulic pump, a pump cover covering the hydraulic pump, and a case for accommodating them. ..

100: Vehicle drive device 1: Driving force source 5: Case 51: First case part 51a: Opening 52: Second case part 521: Support part 522: Rotor accommodating chamber 6: Hydraulic pump 7: Pump cover W: Wheel T: Power transmission path EN: Internal engine MG1: 1st rotary electric machine MG2: 2nd rotary electric machine RT: Rotating member Ros1: 1st rotor shaft BR: Bearing B1: 1st bearing L: Axial direction L1: Axial direction 1st side L2: Axial direction 2nd side R: Radial direction

Claims (5)

A driving force source for driving the wheels,
With a hydraulic pump
A pump cover that covers the hydraulic pump and
A rotating member that is driven and connected to the driving force source,
The hydraulic pump, the pump cover, and a case for accommodating the rotating member are provided.
One side in the axial direction of the rotating member is the first side in the axial direction, and the other side in the axial direction is the second side in the axial direction.
The case includes a first case portion formed with an opening that opens toward the first side in the axial direction, and a second case portion joined to the first case portion so as to close the opening. Prepare,
The pump cover is fixed to the second case portion from the second side in the axial direction so that the hydraulic pump is arranged between the pump cover and the second case portion.
A bearing that rotatably supports the rotating member is arranged on the second side in the axial direction with respect to the pump cover.
The second case portion includes a support portion extending radially to the second side outside the pump cover in the radial direction.
A vehicle drive device in which the support portion supports the bearing in the radial direction. The vehicle drive device according to claim 1, wherein the second case portion includes a rotor accommodating chamber for accommodating the rotor of the hydraulic pump. A fastening member for fixing the pump cover to the second case portion is provided.
The vehicle drive device according to claim 1 or 2, wherein the fastening member is inside the support portion in the radial direction and is arranged on the first side in the axial direction with respect to the bearing. The vehicle drive device according to any one of claims 1 to 3, wherein the pump cover is joined to the second case portion so as to be in direct contact with the second case portion. The vehicle drive device according to any one of claims 1 to 4, wherein the hydraulic pump is driven by a driving force transmitted through a power transmission path connecting the driving force source and the wheels.

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