Driving device for vehicle

Abstract

To provide a driving device for a vehicle capable of being easily miniaturized in an axial direction in a constitution in which a rotary electric machine and an oil pump are coaxially disposed.SOLUTION: An oil pump OP1 includes a connection shaft 3 connected so as to rotate integrally with a pump rotor 1. The connection shaft 3 is engaged with a rotor shaft RS1 via a first engagement portion 10. A gear member GM is engaged with the rotor shaft RS1 via a second engagement portion 20. The first engagement portion 10 engages an inner peripheral surface of the rotor shaft RS1 with an outer peripheral surface of the connection shaft 3 and restricts relative rotation in a circumferential direction C while permitting relative movement between the rotor shaft RS1 and the connection shaft 3 in an axial direction L. The second engagement portion 20 engages an outer peripheral surface of the rotor shaft RS1 with an inner peripheral surface of the gear member GM and restricts relative rotation in the circumferential direction C while permitting relative movement between the rotor shaft RS1 and the gear member GM in the axial direction L. The first engagement portion 10 and the gear member GM overlap each other in a radial view, and the second engagement portion 20 and the connection shaft 3 overlap each other in a radial view.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle drive device including a rotating electric machine having a rotor, a rotor shaft connected to the rotor so as to rotate integrally with the rotor, and an oil pump. [Background technology]

[0002] An example of such a vehicle drive device is disclosed in the following Patent Document 1. In the following description of the background art, reference symbols in Patent Document 1 will be cited in parentheses.

[0003] In the vehicle drive device (100) of Patent Document 1, a rotor gear (2A) is connected to a rotor shaft (21A) so as to rotate integrally with the rotor gear (2A). A pump drive gear (OPa) connected to a pump rotor of an oil pump (OP) so as to rotate integrally with the rotor gear (2A) is engaged with the rotor gear (2A). In this manner, the oil pump (OP) is driven by the driving force of the rotating electric machine (1A). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-185909 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the vehicle drive device (100) of Patent Document 1, the oil pump (OP) is arranged on a different axis from the rotating electric machine (1A), and since the vehicle drive device (100) is likely to become large in size in the radial direction (R), it is desirable to arrange the rotating electric machine (1A) and the oil pump (OP) on the same axis. However, such a configuration is disadvantageous in that it leads to an increase in size of the vehicle drive device (100) in the axial direction (L).

[0006] It is therefore desirable to realize a vehicle drive device that can be easily downsized in the axial direction in a configuration in which a rotating electric machine and an oil pump are coaxially arranged. [Means for solving the problem]

[0007] In view of the above, the characteristic configuration of the vehicle drive device is as follows: A rotating electric machine having a rotor; a cylindrical rotor shaft connected to the rotor so as to rotate integrally with the rotor; An output member drivingly connected to the wheels; a gear member having a first gear; a power transmission mechanism including a second gear that meshes with the first gear and transmits power between the first gear and the output member; an oil pump having a pump rotor; the rotor, the rotor shaft, the gear member, and the pump rotor are coaxially arranged, A direction along the rotor axis, which is the rotation axis of the rotor, is defined as an axial direction, one side in the axial direction is defined as an axial first side, the other side in the axial direction is defined as an axial second side, a direction perpendicular to the rotor axis is defined as a radial direction, and a direction going around the rotor axis is defined as a circumferential direction, The rotor, the gear member, and the pump rotor are arranged in the axial direction in the order described above from the first axial side to the second axial side, The oil pump includes a connecting shaft that is connected to the pump rotor so as to rotate integrally with the pump rotor, the connecting shaft is engaged with the rotor shaft via a first engaging portion so as to rotate integrally with the rotor shaft, the gear member is engaged with the rotor shaft via a second engagement portion so as to rotate integrally with the rotor shaft; the first engagement portion is configured to engage an inner circumferential surface of the rotor shaft and an outer circumferential surface of the connecting shaft and to restrict relative rotation between the rotor shaft and the connecting shaft in the circumferential direction while allowing relative movement between the rotor shaft and the connecting shaft in the axial direction, the second engagement portion is configured to engage an outer circumferential surface of the rotor shaft and an inner circumferential surface of the gear member and to restrict relative rotation between the rotor shaft and the gear member in the circumferential direction while allowing relative movement between the rotor shaft and the gear member in the axial direction, the first engagement portion and the gear member are arranged to overlap each other when viewed in a radial direction along the radial direction, The second engagement portion and the connecting shaft are disposed so as to overlap each other when viewed in the radial direction.

[0008] According to this characteristic configuration, the rotor, rotor shaft, gear member, and pump rotor are arranged coaxially, and the rotor, gear member, and pump rotor are arranged in the axial direction in the order described from the first axial side to the second axial side. The first engagement portion and the gear member are arranged to overlap each other in a radial view, and the second engagement portion and the connecting shaft are arranged to overlap each other in a radial view. This makes it possible to reduce the axial arrangement area of ​​the rotor, rotor shaft, gear member, and pump rotor while arranging them coaxially. Therefore, in a configuration in which the rotating electric machine and the oil pump are arranged coaxially, it is easy to reduce the size of the vehicle drive device in the axial direction. Furthermore, according to this configuration, the connecting shaft, which rotates integrally with the pump rotor, and the rotor shaft are engaged via a first engagement portion that allows relative axial movement therebetween, and the gear member and the rotor shaft are engaged via a second engagement portion that allows relative axial movement therebetween. This makes it possible to prevent the axial load acting on the first gear due to the meshing of the first gear and the second gear from being transmitted to the pump rotor. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view taken along an axial direction of a vehicle drive device according to an embodiment; [Diagram 2] 1 is a skeleton diagram of a vehicle drive device according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a partially enlarged cross-sectional view of the vehicle drive device according to the embodiment taken along an axial direction; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a vehicle drive device 100 according to an embodiment will be described with reference to the drawings. As shown in Fig. 1 and Fig. 2, the vehicle drive device 100 includes a first rotating electric machine MG1, a first rotor shaft RS1, an output member O, a gear member GM, a power transmission mechanism TS, and a first oil pump OP1.

[0011] The first rotating electric machine MG1 has a function as a motor (electric motor) that receives a supply of electric power to generate power, and a function as a generator (electric generator) that receives a supply of power to generate electric power. The first rotating electric machine MG1 is a "rotating electric machine" that includes a first stator ST1 and a first rotor RT1 that is rotatably supported by the first stator ST1. The first rotor shaft RS1 is a cylindrical "rotor shaft" that is connected to the first rotor RT1 so as to rotate integrally with the first rotor RT1.

[0012] The output member O is drivingly connected to a wheel W (see FIG. 2). In this 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 includes a state in which the two rotating elements are connected so as to rotate integrally, or a state in which the two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at a variable speed, such as a shaft, a gear mechanism, a belt, a chain, etc. Note that the transmission members may also include an engagement device that selectively transmits rotation and driving force, such as a friction engagement device, a meshing engagement device, etc.

[0013] The gear member GM includes a first rotor gear Gr1. The power transmission mechanism TS includes a first input gear Gi1 that meshes with the first rotor gear Gr1. The power transmission mechanism TS is configured to transmit power between the first rotor gear Gr1 and the output member O. In this embodiment, the first rotor gear Gr1 corresponds to the "first gear" and the first input gear Gi1 corresponds to the "second gear."

[0014] In this embodiment, the vehicle drive device 100 further includes an input member I, a second rotating electric machine MG2, a second rotor shaft RS2, an engagement device CL, a differential gear mechanism DF, a second oil pump OP2, and a case 9.

[0015] The input member I is connected to the first input gear Gi1 so as to rotate integrally with the input member I. The input member I is drivingly connected to the internal combustion engine EG. The internal combustion engine EG functions as a driving force source for wheels W (see FIG. 2). The internal combustion engine EG is a prime mover (such as a gasoline engine or a diesel engine) that is driven by the combustion of fuel to extract power.

[0016] The second rotating electric machine MG2, like the first rotating electric machine MG1, has a function as a motor (electric motor) that receives a supply of electric power to generate power, and a function as a generator (electric generator) that receives a supply of power to generate electric power. The second rotating electric machine MG2 includes a second stator ST2 and a second rotor RT2 rotatably supported by the second stator ST2. The second rotor shaft RS2 is connected to the second rotor RT2 so as to rotate integrally therewith.

[0017] The engagement device CL is a friction clutch that connects and disconnects the power transmission in the power transmission mechanism TS. The differential gear mechanism DF is configured to distribute the driving force transmitted to the output member O to a pair of wheels W.

[0018] In this embodiment, there are a first axis X1 to a sixth axis X6 as rotation axes of a plurality of rotating members included in the vehicle drive device 100. The first axis X1 to the sixth axis X6 are arranged parallel to one another.

[0019] In the following description, the direction along each of the first axis X1 to the sixth axis X6 is referred to as the "axial direction L." One side of the axial direction L is referred to as the "first axial side L1," and the other side of the axial direction L is referred to as the "second axial side L2." Additionally, the direction perpendicular to each of the first axis X1 to the sixth axis X6 is referred to as the "radial direction R" based on the corresponding axis. Note that when it is not necessary to distinguish which axis is used as the reference or when it is clear which axis is used as the reference, it may be simply referred to as the "radial direction R."

[0020] As shown in FIG. 1, the case 9 accommodates the first rotating electric machine MG1, the first rotor shaft RS1, the gear member GM, the power transmission mechanism TS, and the first oil pump OP1. In this embodiment, the case 9 includes a first accommodation chamber CM1 and a second accommodation chamber CM2. The first accommodation chamber CM1 is a space that accommodates the gear member GM, the power transmission mechanism TS, the input member I, the output member O, the differential gear mechanism DF, the engagement device CL, the first oil pump OP1, and the second oil pump OP2. The second accommodation chamber CM2 is a space that accommodates the first rotating electric machine MG1 and the second rotating electric machine MG2. In this embodiment, the first accommodation chamber CM1 is disposed on the second axial side L2 relative to the second accommodation chamber CM2.

[0021] The case 9 includes a first case part 91, a second case part 92, and a third case part 93. The first case part 91 and the second case part 92 are joined together to form a first storage chamber CM1. The first case part 91 and the third case part 93 are joined together to form a second storage chamber CM2. In this embodiment, the second case part 92 is joined to the first case part 91 from the second axial side L2. The first storage chamber CM1 is formed between the first case part 91 and the second case part 92 in the axial direction L. The third case part 93 is joined to the first case part 91 from the first axial side L1. The second storage chamber CM2 is formed between the first case part 91 and the third case part 93 in the axial direction L.

[0022] The first case portion 91 includes a partition wall portion 911 and a first side wall portion 912. The partition wall portion 911 and the first side wall portion 912 are each formed to extend along the radial direction R. The partition wall portion 911 is disposed so as to cover the gear member GM and the power transmission mechanism TS from the first axial side L1, and to cover the first rotating electric machine MG1 and the second rotating electric machine MG2 from the second axial side L2. In this manner, the partition wall portion 911 is formed so as to separate the first housing chamber CM1 and the second housing chamber CM2 in the axial direction L. The first side wall portion 912 is disposed so as to cover the differential gear mechanism DF from the first axial side L1.

[0023] The second case portion 92 includes a second side wall portion 921 and a third side wall portion 922. Each of the second side wall portion 921 and the third side wall portion 922 is formed to extend along the radial direction R. The second side wall portion 921 is disposed so as to cover the gear member GM and the power transmission mechanism TS from the second axial side L2. The third side wall portion 922 is disposed so as to cover the differential gear mechanism DF from the second axial side L2.

[0024] The third case portion 93 includes a fourth side wall portion 931. The fourth side wall portion 931 is formed so as to extend along the radial direction R. The fourth side wall portion 931 is disposed so as to cover the first rotating electric machine MG1 and the second rotating electric machine MG2 from the first axial side L1.

[0025] The input member I is disposed on the first axis X1. In this embodiment, the input member I is a shaft member extending along the axial direction L. The input member I is disposed so as to penetrate the second side wall portion 921 in the axial direction L. The input member I is rotatably supported from the outside in the radial direction R by the second side wall portion 921 via an input bearing B11.

[0026] The first rotating electric machine MG1 is disposed on the second axis X2. In this embodiment, the second axis X2 corresponds to the "rotor axis."

[0027] The first stator ST1 of the first rotating electric machine MG1 includes a cylindrical first stator core SC1. The first stator core SC1 is fixed to a case 9 (here, a first case portion 91). The first rotor RT1 of the first rotating electric machine MG1 includes a cylindrical first rotor core RC1. The first rotor core RC1 is supported rotatably relative to the first stator core SC1. The first rotor core RC1 is connected to the first rotor shaft RS1 so as to rotate integrally therewith.

[0028] The first rotor shaft RS1 is a cylindrical shaft member extending along the axial direction L. In this embodiment, the first rotor shaft RS1 is disposed so as to penetrate the partition wall portion 911 in the axial direction L. The first rotor shaft RS1 is rotatably supported from the outside in the radial direction R by the partition wall portion 911 via the first rotor bearing B21. The first rotor shaft RS1 is rotatably supported from the outside in the radial direction R by the fourth side wall portion 931 via the second rotor bearing B22.

[0029] In this embodiment, the first rotating electric machine MG1 is an inner rotor type rotating electric machine. Therefore, the first rotor core RC1 is disposed on the inside in the radial direction R with respect to the first stator core SC1. Also, the first rotor shaft RS1 is disposed on the inside in the radial direction R with respect to the first rotor core RC1.

[0030] In this embodiment, the first rotating electric machine MG1 is a rotating field type rotating electric machine. Therefore, a stator coil is wound around the first stator core SC1. In this embodiment, the stator coil is wound around the first stator core SC1 so that a first coil end portion CE1 protruding on both sides in the axial direction L is formed with respect to the first stator core SC1. In addition, a permanent magnet is provided in the first rotor core RC1.

[0031] The second rotating electric machine MG2 is disposed on the third axis X3. The second stator ST2 of the second rotating electric machine MG2 includes a cylindrical second stator core SC2. The second stator core SC2 is fixed to the case 9 (here, the first case portion 91). The second rotor RT2 of the second rotating electric machine MG2 includes a cylindrical second rotor core RC2. The second rotor core RC2 is supported rotatably relative to the second stator core SC2. In this embodiment, the second rotor core RC2 is connected to the second rotor shaft RS2 so as to rotate integrally therewith.

[0032] The second rotor shaft RS2 is a shaft member extending along the axial direction L. In this embodiment, the second rotor shaft RS2 is disposed so as to penetrate the partition wall portion 911 in the axial direction L. The second rotor shaft RS2 also includes a first shaft member RS21 connected to the second rotor core RC2 so as to rotate integrally therewith, and a second shaft member RS22 connected to the first shaft member RS21 so as to rotate integrally therewith. In this embodiment, the first shaft member RS21 is rotatably supported from the outside in the radial direction R by the partition wall portion 911 via the third rotor bearing B31. Furthermore, the first shaft member RS21 is rotatably supported from the outside in the radial direction R by the fourth side wall portion 931 via the fourth rotor bearing B32. The second shaft member RS22 is rotatably supported from the outside in the radial direction R by the partition wall portion 911 via the fifth rotor bearing B33. Furthermore, the second shaft member RS22 is rotatably supported from the outside in the radial direction R by the second side wall portion 921 via a sixth rotor bearing B34.

[0033] In this embodiment, the second rotating electric machine MG2 is an inner rotor type rotating electric machine. Therefore, the second rotor core RC2 is disposed on the inside in the radial direction R with respect to the second stator core SC2. Also, the second rotor shaft RS2 is disposed on the inside in the radial direction R with respect to the second rotor core RC2.

[0034] In this embodiment, the second rotating electric machine MG2 is a rotating field type rotating electric machine. Therefore, a stator coil is wound around the second stator core SC2. In this embodiment, the stator coil is wound around the second stator core SC2 so that second coil end portions CE2 protruding on both sides in the axial direction L are formed with respect to the second stator core SC2. In addition, a permanent magnet is provided in the second rotor core RC2.

[0035] The differential gear mechanism DF is disposed on the fourth axis X4. The differential gear mechanism DF includes a differential case DC, a pair of pinion gears PG, and a pair of side gears SG.

[0036] The differential case DC houses a pair of pinion gears PG and a pair of side gears SG. The differential case DC is configured to rotate about a fourth axis X4. In this embodiment, the differential case DC is rotatably supported from the outside in the radial direction R by the first side wall portion 912 via a first differential bearing B41. The differential case DC is rotatably supported from the outside in the radial direction R by the third side wall portion 922 via a second differential bearing B42.

[0037] The pair of pinion gears PG are disposed to face each other with a gap in the radial direction R based on the fourth axis X4. The pair of pinion gears PG are rotatably supported by a pinion shaft PS fixed to the differential case DC. More specifically, each of the pair of pinion gears PG is configured to be rotatable (spin) about its own axis and rotatable (revolve) about the fourth axis X4.

[0038] The pair of side gears SG are arranged on either side of the pinion shaft PS in the axial direction L. The pair of side gears SG mesh with the pair of pinion gears PG. The pair of side gears SG are configured to rotate about a fourth axis X4. Each of the pair of side gears SG is connected to a drive shaft DS drivingly connected to wheels W so as to rotate integrally with the drive shaft DS.

[0039] In this embodiment, the gear member GM is rotatably supported with respect to the case 9 via a first rotor gear bearing B61 ​​and a second rotor gear bearing B62. In this embodiment, the first rotor gear bearing B61 ​​corresponds to the "first bearing" and the second rotor gear bearing B62 corresponds to the "second bearing."

[0040] In this embodiment, the vehicle drive device 100 further includes a second input gear Gi2, a second rotor gear Gr2, a first counter gear Gc1, a second counter gear Gc2, and a differential input gear Gd.

[0041] The second input gear Gi2 is connected to the first input gear Gi1 via an engagement device CL. In this embodiment, the second input gear Gi2 is disposed on the outer side of the input member I in the radial direction R. The second input gear Gi2 and the input member I are supported by a second input gear bearing B52 so as to be rotatable relative to each other. In this embodiment, the first input gear Gi1 is supported by the partition wall portion 911 from the inner side in the radial direction R via the first input gear bearing B51 so as to be rotatable.

[0042] The first input gear Gi1, the second input gear Gi2, and the engagement device CL are disposed on the first axis X1. In this embodiment, the first input gear Gi1, the engagement device CL, and the second input gear Gi2 are disposed in the described order from the first axial side L1 toward the second axial side L2.

[0043] The first counter gear Gc1 meshes with the second input gear Gi2. The second counter gear Gc2 meshes with the differential input gear Gd. The first counter gear Gc1 and the second counter gear Gc2 are disposed on the fifth axis X5. In this embodiment, the second counter gear Gc2 is formed to have a smaller diameter than the first counter gear Gc1. The second counter gear Gc2 is disposed on the first axial side L1 of the first counter gear Gc1.

[0044] The first counter gear Gc1 and the second counter gear Gc2 are connected to each other via a counter shaft CS so as to rotate integrally with each other. The counter shaft CS is a shaft member extending along the axial direction L. In this embodiment, the counter shaft CS is rotatably supported from the outside in the radial direction R by the partition wall portion 911 via a first counter bearing B71. Furthermore, the counter shaft CS is rotatably supported from the outside in the radial direction R by the second side wall portion 921 via a second counter bearing B72.

[0045] The differential input gear Gd is connected to the differential case DC so as to rotate integrally with the differential case DC. In this embodiment, the differential input gear Gd functions as an output member O. Therefore, in this embodiment, the first input gear Gi1, the second input gear Gi2, the first counter gear Gc1, and the second counter gear Gc2 function as a power transmission mechanism TS that transmits power between the first rotor gear Gr1 and the output member O (here, the differential input gear Gd). That is, in this embodiment, the power transmission mechanism TS further includes the second input gear Gi2, the first counter gear Gc1, and the second counter gear Gc2 in addition to the first input gear Gi1.

[0046] The second rotor gear Gr2 meshes with the first counter gear Gc1. The second rotor gear Gr2 is connected to the second rotor shaft RS2 so as to rotate integrally with the second rotor shaft RS2. The second rotor gear Gr2 and the second rotor shaft RS2 are disposed on the third axis X3. In this embodiment, the second rotor gear Gr2 is connected to the second shaft member RS22 of the second rotor shaft RS2 so as to rotate integrally with the second rotor shaft RS2.

[0047] As shown in FIG. 2, the second oil pump OP2 includes a second pump rotor 2. The second pump rotor 2 is connected to a pump drive gear Gp so as to rotate integrally with the pump drive gear Gp. The pump drive gear Gp meshes with the differential input gear Gd. In this manner, the second oil pump OP2 is driven by the differential input gear Gd. The second pump rotor 2 and the pump drive gear Gp are disposed on a sixth axis X6.

[0048] As shown in Fig. 3, the first oil pump OP1 is an "oil pump" equipped with a first pump rotor 1. The first rotor RT1, first rotor shaft RS1, gear member GM, and first pump rotor 1 are arranged coaxially (here, on the second axis X2). The first rotor RT1, gear member GM, and first pump rotor 1 are arranged in the axial direction L from the first axial side L1 to the second axial side L2 in the order described.

[0049] The first oil pump OP1 also includes a connecting shaft 3. The connecting shaft 3 is connected to the first pump rotor 1 so as to rotate integrally with the first pump rotor 1. The connecting shaft 3 is disposed on the inside in the radial direction R with respect to the first rotor shaft RS1.

[0050] In this embodiment, the first oil pump OP1 is an internal gear pump.

[0051] The inner rotor 11 is connected to the connecting shaft 3 so as to rotate integrally with the connecting shaft 3. In this embodiment, a through hole penetrating the inner rotor 11 in the axial direction L is formed, and the connecting shaft 3 is fitted into the through hole. A two-sided width portion having two parallel flat surfaces formed on the outer circumferential surface of the connecting shaft 3 engages with a two-sided width portion formed on the inner circumferential surface of the through hole. The inner rotor 11 and the connecting shaft 3 may be connected, for example, by spline engagement or by welding. The inner rotor 11 and the connecting shaft 3 may be integrally formed by one member. The outer rotor 12 is disposed outside the inner rotor 11 in the radial direction R. External teeth are formed on the outer circumferential surface of the inner rotor 11. Internal teeth that mesh with the external teeth of the inner rotor 11 are formed on the inner circumferential surface of the outer rotor 12.

[0052] Hereinafter, the direction going around the second axis X2 is referred to as "circumferential direction C".

[0053] The inner rotor 11 and the outer rotor 12 have eccentric rotational axes, and the interval in the radial direction R of the space between the external teeth of the inner rotor 11 and the internal teeth of the outer rotor 12 varies depending on the position in the circumferential direction C. Therefore, when viewed at each position in the circumferential direction C, the interval in the radial direction R of the space between the external teeth of the inner rotor 11 and the internal teeth of the outer rotor 12 changes such that the interval gradually expands and then gradually contracts due to the rotation of the inner rotor 11 and the outer rotor 12. As a result, the volume of the space between the external teeth of the inner rotor 11 and the internal teeth of the outer rotor 12 changes due to the rotation of the inner rotor 11 and the outer rotor 12. In this embodiment, the rotational axis of the first pump rotor 1 (here, the second axis X2) indicates the rotational axis of the inner rotor 11.

[0054] The connecting shaft 3 is engaged with the first rotor shaft RS1 via a first engagement portion 10 so as to rotate integrally with the first rotor shaft RS1. The first engagement portion 10 is configured to engage an inner circumferential surface of the first rotor shaft RS1 with an outer circumferential surface of the connecting shaft 3, and to restrict relative rotation in the circumferential direction C between the first rotor shaft RS1 and the connecting shaft 3 while allowing relative movement in the axial direction L.

[0055] The gear member GM is engaged with the first rotor shaft RS1 via a second engagement portion 20 so as to rotate integrally with the first rotor shaft RS1. The second engagement portion 20 is configured to engage an outer peripheral surface of the first rotor shaft RS1 with an inner peripheral surface of the gear member GM, and to restrict relative rotation in the circumferential direction C between the first rotor shaft RS1 and the gear member GM while allowing relative movement in the axial direction L between them.

[0056] The first engagement portion 10 and the gear member GM are arranged so as to overlap each other when viewed in the radial direction along the radial direction R. In this embodiment, the first engagement portion 10 and the first rotor gear Gr1 are arranged so as to overlap each other when viewed in the radial direction along the radial direction R. The second engagement portion 20 and the connecting shaft 3 are arranged so as to overlap each other when viewed in the radial direction along the radial direction R. Here, with regard to the arrangement of two elements, "overlapping when viewed in a specific direction" refers to the presence of at least a portion of an area where a virtual line parallel to the line of sight intersects with both of the two elements when the virtual line is moved in each direction perpendicular to the virtual line.

[0057] As described above, the vehicle drive device 100 has the following features: a first rotating electric machine MG1 including a first rotor RT1; a cylindrical first rotor shaft RS1 connected to the first rotor RT1 so as to rotate integrally with the first rotor RT1; An output member O drivingly connected to a wheel W; A gear member GM having a first rotor gear Gr1 as a first gear; a power transmission mechanism TS including a first input gear Gi1 as a second gear meshing with the first gear, and transmitting power between the first rotor gear Gr1 and an output member O; A first oil pump OP1 having a first pump rotor 1, A first rotor RT1, a first rotor shaft RS1, a gear member GM, and a first pump rotor 1 are coaxially arranged, The first rotor RT1, the gear member GM, and the first pump rotor 1 are arranged in the axial direction L in the order described from the first axial side L1 to the second axial side L2, The first oil pump OP1 includes a connecting shaft 3 connected to the first pump rotor 1 so as to rotate integrally with the first oil pump OP1. The connecting shaft 3 is engaged with the first rotor shaft RS1 via a first engaging portion 10 so as to rotate integrally with the first rotor shaft RS1. The gear member GM is engaged with the first rotor shaft RS1 via the second engagement portion 20 so as to rotate integrally with the first rotor shaft RS1. the first engagement portion 10 is configured to engage an inner circumferential surface of the first rotor shaft RS1 and an outer circumferential surface of the connecting shaft 3, and to restrict relative rotation in the circumferential direction C between the first rotor shaft RS1 and the connecting shaft 3 while allowing relative movement in the axial direction L; the second engagement portion 20 is configured to engage an outer peripheral surface of the first rotor shaft RS1 and an inner peripheral surface of the gear member GM, and to restrict relative rotation in the circumferential direction C between the first rotor shaft RS1 and the gear member GM while allowing relative movement in the axial direction L; The first engagement portion 10 and the gear member GM are arranged to overlap each other when viewed in the radial direction R, The second engagement portion 20 and the connecting shaft 3 are disposed so as to overlap with each other when viewed in the radial direction R.

[0058] According to this configuration, the first rotor RT1, the first rotor shaft RS1, the gear member GM, and the first pump rotor 1 are arranged coaxially, and the first rotor RT1, the gear member GM, and the first pump rotor 1 are arranged in the axial direction L in the order described from the first axial side L1 to the second axial side L2. The first engagement portion 10 and the gear member GM are arranged to overlap each other when viewed in the radial direction, and the second engagement portion 20 and the connecting shaft 3 are arranged to overlap each other when viewed in the radial direction. This makes it possible to reduce the arrangement area in the axial direction L of the first rotor RT1, the first rotor shaft RS1, the gear member GM, and the first pump rotor 1 while arranging them coaxially. Therefore, in a configuration in which the first rotating electric machine MG1 and the first oil pump OP1 are arranged coaxially, it is easy to reduce the size of the vehicle drive device 100 in the axial direction L. Furthermore, according to this configuration, the connecting shaft 3, which rotates integrally with the first pump rotor 1, and the first rotor shaft RS1 are engaged via the first engagement portion 10 that allows relative movement therebetween in the axial direction L, and the gear member GM and the first rotor shaft RS1 are engaged via the second engagement portion 20 that allows relative movement therebetween in the axial direction L. This makes it possible to make it difficult for the load in the axial direction L that acts on the first rotor gear Gr1 due to the meshing between the first rotor gear Gr1 and the first input gear Gi1 to be transmitted to the first pump rotor 1.

[0059] In this embodiment, the first engagement portion 10 includes a first inner circumference engagement portion 10a and a first outer circumference engagement portion 10b configured to be freely engaged with each other. The first inner circumference engagement portion 10a is formed on the inner circumference surface of the first rotor shaft RS1. The first outer circumference engagement portion 10b is formed on the outer circumference surface of the connecting shaft 3. In this embodiment, the first inner circumference engagement portion 10a and the first outer circumference engagement portion 10b are splines formed so as to extend along the axial direction L. In the illustrated example, the first outer circumference engagement portion 10b is formed in a region in a predetermined axial direction L from the end face of the connecting shaft 3 on the first axial side L1.

[0060] In this embodiment, the gear member GM further includes a cylindrical portion 5. The cylindrical portion 5 is formed in a cylindrical shape with the second axis X2 as its axis. The cylindrical portion 5 is disposed on the outer side in the radial direction R with respect to the first rotor shaft RS1.

[0061] In this embodiment, the second engagement portion 20 includes a second inner circumference engagement portion 20a and a second outer circumference engagement portion 20b configured to be freely engaged with each other. The second inner circumference engagement portion 20a is formed on the inner circumference surface of the cylindrical portion 5 of the gear member GM. The second outer circumference engagement portion 20b is formed on the outer circumference surface of the first rotor shaft RS1. In this embodiment, the second inner circumference engagement portion 20a and the second outer circumference engagement portion 20b are splines formed to extend along the axial direction L.

[0062] In this embodiment, the second outer periphery engagement portion 20b is disposed on the second axial side L2 with respect to the first inner periphery engagement portion 10a in the first rotor shaft RS1. That is, in this embodiment, the first engagement portion 10 is disposed on the first axial side L1 with respect to the second engagement portion 20. In the illustrated example, the second outer periphery engagement portion 20b is formed in a region in a predetermined axial direction L from the end face of the first rotor shaft RS1 on the second axial side L2.

[0063] In this embodiment, the first rotor gear Gr1 is disposed on the outer side in the radial direction R and on the first axial side L1 with respect to the cylindrical portion 5 on which the second inner peripheral engagement portion 20a is formed. Therefore, in this embodiment, the first rotor gear Gr1 has a portion that is disposed on the first axial side L1 with respect to the second engagement portion 20. In the illustrated example, the entire first rotor gear Gr1 is disposed on the first axial side L1 with respect to the second engagement portion 20.

[0064] In this manner, in the present embodiment, the first rotor gear Gr1 includes a portion disposed on the first axial side L1 with respect to the second engagement portion 20, The first engagement portion 10 is disposed on a first side L1 in the axial direction relative to the second engagement portion 20.

[0065] According to this configuration, the first engagement portion 10 can be disposed in a space on the inside in the radial direction R with respect to the first rotor gear Gr1. This makes it easier to reduce the size of the vehicle drive device 100 in the axial direction L compared to a configuration in which the first engagement portion 10 is disposed on the second axial side L2 with respect to the second engagement portion 20.

[0066] In order to reduce the size of the vehicle drive device 100 in the axial direction L, it is possible to configure the first engagement portion 10 and the second engagement portion 20 to overlap each other when viewed in the radial direction R, that is, to configure the first inner periphery engagement portion 10a and the second outer periphery engagement portion 20b formed on the first rotor shaft RS1 to overlap each other when viewed in the radial direction R. However, in such a configuration, when the first inner periphery engagement portion 10a and the second outer periphery engagement portion 20b as splines are hardened, problems such as the portion of the first rotor shaft RS1 where the first inner periphery engagement portion 10a and the second outer periphery engagement portion 20b are formed becoming brittle may occur. Therefore, it is preferable to dispose the first engagement portion 10 and the second engagement portion 20 so as to be shifted from each other in the axial direction L, as in this embodiment.

[0067] In this embodiment, the first rotor gear bearing B61 ​​is disposed on the inside in the radial direction R with respect to the first rotor gear Gr1 and at a position overlapping with the first rotor gear Gr1 as viewed in the radial direction R. The first rotor gear Gr1 is rotatably supported from the inside in the radial direction R via the first rotor gear bearing B61 ​​by a first support wall portion 913 formed to protrude from the partition wall portion 911 to the second axial side L2.

[0068] In this embodiment, the second rotor gear bearing B62 is disposed on the outer side in the radial direction R with respect to the second engagement portion 20, at a position overlapping with the second engagement portion 20 as viewed in the radial direction R. The cylindrical portion 5 of the gear member GM is rotatably supported from the outer side in the radial direction R via the second rotor gear bearing B62 by a second support wall portion 923 formed so as to protrude from the second side wall portion 921 to the first axial side L1.

[0069] As described above, in this embodiment, the vehicle drive device 100 further includes a case 9 that houses the first rotating electric machine MG1, the first rotor shaft RS1, the gear member GM, the power transmission mechanism TS, and the first oil pump OP1. The gear member GM is rotatably supported with respect to the case 9 via a first rotor gear bearing B61 ​​as a first bearing and a second rotor gear bearing B62 as a second bearing. The first rotor gear bearing B61 ​​is disposed on the inside of the first rotor gear Gr1 in the radial direction R and at a position overlapping with the first rotor gear Gr1 as viewed in the radial direction, The second rotor gear bearing B62 is disposed on the outer side of the second engagement portion 20 in the radial direction R and at a position overlapping with the second engagement portion 20 as viewed in the radial direction.

[0070] According to this configuration, the first rotor gear bearing B61 ​​is arranged so as to overlap with the first rotor gear Gr1 in a radial view, and the second rotor gear bearing B62 is arranged so as to overlap with the second engagement portion 20 in a radial view. This makes it easier to reduce the size of the vehicle drive device 100 in the axial direction L compared to a configuration in which the first rotor gear bearing B61 ​​is arranged at a position shifted in the axial direction L with respect to the first rotor gear Gr1, or a configuration in which the second rotor gear bearing B62 is arranged at a position shifted in the axial direction L with respect to the second engagement portion 20.

[0071] In this embodiment, the arrangement area of ​​the second engagement portion 20 in the axial direction L overlaps with the arrangement area of ​​the engagement device CL in the axial direction L. In addition, the arrangement area of ​​the second rotor gear bearing B62 in the axial direction L overlaps with the arrangement area of ​​the engagement device CL in the axial direction L.

[0072] In this embodiment, the first oil pump OP1 further includes a cover member 4. The cover member 4 is joined to the second side wall portion 921 from the first axial side L1. In this embodiment, the second side wall portion 921 corresponds to a "case wall portion" that is a wall portion of the case 9 that is disposed on the second axial side L2 with respect to the gear member GM.

[0073] A pump chamber PC is formed between the second side wall portion 921 and the cover member 4 in the axial direction L. The first pump rotor 1 is housed in the pump chamber PC. In this embodiment, the pump chamber PC is formed from a surface of the second side wall portion 921 facing the first axial side L1 toward the second axial side L2.

[0074] The cover member 4 includes a bearing support portion 41 that supports the second rotor gear bearing B62 from the second axial side L2. The bearing support portion 41 is disposed on the outer side in the radial direction R with respect to the pump chamber PC. In this embodiment, the second rotor gear bearing B62 and the bearing support portion 41 are supported from the outer side in the radial direction R by the second support wall portion 923. The bearing support portion 41 supports the second rotor gear bearing B62 from the second axial side L2 via an annular washer WS disposed on the inner circumferential surface of the second support wall portion 923.

[0075] The second rotor gear bearing B62 is disposed on the second axial side L2 relative to the first rotor gear Gr1 and on the first axial side L1 relative to the cover member 4. The second rotor gear bearing B62 is disposed so as to abut against the gear member GM from the second axial side L2. In this embodiment, a step surface 5a facing the second axial side L2 is formed on the outer circumferential surface of the cylindrical portion 5 of the gear member GM. The second rotor gear bearing B62 is disposed so as to abut against the step surface 5a from the second axial side L2.

[0076] In this manner, in the present embodiment, the case 9 includes the second side wall portion 921 serving as a case wall portion that is a wall portion of the case 9 and that is disposed on the second axial side L2 with respect to the gear member GM. The first oil pump OP1 further includes a cover member 4 joined to the second side wall portion 921 from the first axial side L1, The first pump rotor 1 is accommodated in a pump chamber PC formed between the second side wall portion 921 and the cover member 4 in the axial direction L. The second rotor gear bearing B62 abuts against the gear member GM from the second axial side L2, and is disposed on the second axial side L2 with respect to the first rotor gear Gr1 and on the first axial side L1 with respect to the cover member 4, The cover member 4 includes a bearing support portion 41 that supports the second rotor gear bearing B62 from the second axial side L2. The bearing support portion 41 is disposed on the outer side in the radial direction R with respect to the pump chamber PC.

[0077] According to this configuration, the gear member GM can be supported from the second axial side L2 by the second side wall portion 921 via the second rotor gear bearing B62 and the cover member 4. This makes it possible to prevent the gear member GM from moving relative to the first rotor shaft RS1 toward the second axial side L2. Furthermore, with this configuration, the bearing support portion 41 of the cover member 4 is disposed outside the pump chamber PC in the radial direction R. This makes it possible to minimize the effect of the load in the axial direction L from the gear member GM on the pump chamber PC and the first pump rotor 1.

[0078] In this embodiment, the cover member 4 further includes a cylindrical support portion 42. The cylindrical support portion 42 is formed in a cylindrical shape with its axis center on the second axis X2. The cylindrical support portion 42 is disposed on the outer side in the radial direction R with respect to the connecting shaft 3. In this embodiment, the cylindrical support portion 42 is disposed so as to face the first rotor shaft RS1 from the second axial side L2.

[0079] The cylindrical support portion 42 rotatably supports the connecting shaft 3 via a plain bearing B8 from the outside in the radial direction R. In this embodiment, the plain bearing B8 is a cylindrical bush.

[0080] In this embodiment, the arrangement area of ​​the first oil pump OP1 (here, the connecting shaft 3) in the axial direction L overlaps with the arrangement area of ​​the engagement device CL in the axial direction L. In addition, the arrangement area of ​​the first oil pump OP1 (here, the first pump rotor 1, the connecting shaft 3, and the cover member 4) in the axial direction L overlaps with the arrangement area of ​​the second input gear Gi2 in the axial direction L.

[0081] The flow of the oil discharged from the first oil pump OP1 will be described below with reference to FIG.

[0082] In this embodiment, the oil discharged by the first oil pump OP1 is supplied to the circumferential oil passage P2 through an oil supply passage P1 formed in the cover member 4. The circumferential oil passage P2 is a space along the circumferential direction C that is formed between the inner circumferential surface of the cylindrical support portion 42 of the cover member 4 and the outer circumferential surface of the connecting shaft 3, on the second axial side L2 with respect to the sliding bearing B8.

[0083] The oil supplied to the circumferential oil passage P2 is supplied to a first in-shaft oil passage P3 formed to extend inside the connecting shaft 3 along the axial direction L, through a first radial oil passage P4 formed to penetrate the connecting shaft 3 in the radial direction R.

[0084] The oil supplied to the first in-shaft oil passage P3 passes through a second radial oil passage P5 formed so as to penetrate the connecting shaft 3 in the radial direction R, and is then supplied to the plain bearing B8.

[0085] The oil supplied to the first in-shaft oil passage P3 passes through a third radial oil passage P6 formed so as to penetrate the connecting shaft 3 in the radial direction R, and is supplied to a space facing the outer circumferential surface of the connecting shaft 3, on the first axial side L1 with respect to the sliding bearing B8. The oil supplied to that space passes between the first rotor shaft RS1 and the cylindrical support portion 42 of the cover member 4 in the axial direction L, and is supplied to the second rotor gear bearing B62.

[0086] Moreover, the oil supplied to the first in-shaft oil passage P3 is supplied to a second in-shaft oil passage P7 formed so as to extend along the axial direction L inside the first rotor shaft RS1.

[0087] The oil supplied to the second in-shaft oil passage P7 passes through a fourth radial oil passage P8 formed so as to penetrate the first rotor shaft RS1 in the radial direction R, and is supplied to the space between the outer circumferential surface of the first rotor shaft RS1 and the inner circumferential surface of the first support wall portion 913. Then, the oil supplied to that space is supplied to the first rotor gear bearing B61.

[0088] Other embodiments (1) In the above embodiment, the vehicle drive device 100 is configured to drive the wheels W by the driving force of the internal combustion engine EG and the rotating electric machines MG1 and MG2, that is, the vehicle drive device 100 is configured as a drive device for a hybrid vehicle. However, the present invention is not limited to such a configuration, and the vehicle drive device 100 may not include the input member I and may be configured as a drive device for an electric vehicle.

[0089] (2) In the above embodiment, a configuration in which each of the first engagement portion 10 and the second engagement portion 20 includes a spline has been described as an example. However, the present invention is not limited to such a configuration, and at least one of the first engagement portion 10 and the second engagement portion 20 may be formed of, for example, a key and a key groove.

[0090] (3) In the above embodiment, a configuration has been described as an example in which the first engagement portion 10 is disposed on the first axial side L1 relative to the second engagement portion 20. However, the present invention is not limited to such a configuration, and the first engagement portion 10 may be disposed on the second axial side L2 relative to the second engagement portion 20.

[0091] (4) In the above embodiment, a configuration has been described as an example in which the first rotor gear bearing B61 ​​is directly supported by the first support wall portion 913, and the second rotor gear bearing B62 is directly supported by the second side wall portion 921. However, the present invention is not limited to such a configuration, and at least one of the first rotor gear bearing B61 ​​and the second rotor gear bearing B62 may be indirectly supported on the case 9 via a predetermined rotating member or support member.

[0092] (5) In the above embodiment, the configuration in which the bearing support portion 41 indirectly supports the second rotor gear bearing B62 via the washer WS has been described as an example. However, the present invention is not limited to such a configuration, and the bearing support portion 41 may directly support the second rotor gear bearing B62.

[0093] (6) The configurations disclosed in the above-described embodiments can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. As for other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be made as appropriate within the scope of the present disclosure. [Industrial Applicability]

[0094] The technology disclosed herein can be used in a vehicle drive device that includes a rotating electric machine having a rotor, a rotor shaft connected to rotate integrally with the rotor, and an oil pump. [Explanation of symbols]

[0095] 100: vehicle drive device, MG1: first rotating electric machine (rotating electric machine), RT1: first rotor (rotor), RS1: first rotor shaft (rotor shaft), I: input member, O: output member, GM: gear member, TS: power transmission mechanism, Gr1: first rotor gear (first gear), Gi1: first input gear (second gear), OP1: first oil pump (oil pump), PC: pump chamber, 1: first pump rotor rotor (pump rotor), 3: connecting shaft, 4: cover member, 41: bearing support portion, 9: case, 921: second side wall portion (case wall portion), 10: first engagement portion, 20: second engagement portion, B61: first rotor gear bearing (first bearing), B62: second rotor gear bearing (second bearing), EG: internal combustion engine, W: wheel, L: axial direction, L1: first axial side, L2: second axial side, R: radial direction, C: circumferential direction

Claims

1. A rotating electric machine having a rotor; a cylindrical rotor shaft connected to the rotor so as to rotate integrally with the rotor; An output member drivingly connected to the wheels; a gear member having a first gear; a power transmission mechanism including a second gear that meshes with the first gear and transmits power between the first gear and the output member; an oil pump having a pump rotor; the rotor, the rotor shaft, the gear member, and the pump rotor are coaxially arranged, A direction along a rotor axis that is a rotation axis of the rotor is defined as an axial direction, one side in the axial direction is defined as an axial first side, the other side in the axial direction is defined as an axial second side, a direction perpendicular to the rotor axis is defined as a radial direction, and a direction going around the rotor axis is defined as a circumferential direction, The rotor, the gear member, and the pump rotor are arranged in the axial direction in the order described above from the first axial side to the second axial side, The oil pump includes a connecting shaft that is connected to the pump rotor so as to rotate integrally with the pump rotor, the connecting shaft is engaged with the rotor shaft via a first engaging portion so as to rotate integrally with the rotor shaft, the gear member is engaged with the rotor shaft via a second engagement portion so as to rotate integrally with the rotor shaft, the first engagement portion is configured to engage an inner circumferential surface of the rotor shaft and an outer circumferential surface of the connecting shaft and to restrict relative rotation between the rotor shaft and the connecting shaft in the circumferential direction while allowing relative movement between the rotor shaft and the connecting shaft in the axial direction, the second engagement portion is configured to engage an outer circumferential surface of the rotor shaft and an inner circumferential surface of the gear member and to restrict relative rotation between the rotor shaft and the gear member in the circumferential direction while allowing relative movement between the rotor shaft and the gear member in the axial direction, The first engagement portion and the gear member are arranged to overlap each other when viewed in a radial direction along the radial direction, The vehicle drive device, wherein the second engagement portion and the connecting shaft are arranged to overlap each other when viewed in the radial direction.

2. the first gear includes a portion disposed on a first axial side with respect to the second engagement portion, The vehicle drive device according to claim 1 , wherein the first engagement portion is disposed on a first side in the axial direction with respect to the second engagement portion.

3. a case that accommodates the rotating electric machine, the rotor shaft, the gear member, the power transmission mechanism, and the oil pump, the gear member is rotatably supported with respect to the case via a first bearing and a second bearing, The first bearing is disposed on the radially inner side of the first gear and at a position overlapping with the first gear as viewed in the radial direction, The vehicle drive device according to claim 1 or 2, wherein the second bearing is disposed radially outward of the second engagement portion and at a position overlapping with the second engagement portion as viewed in the radial direction.

4. the case includes a case wall portion that is a wall portion of the case and that is disposed on the second axial side with respect to the gear member, the oil pump further includes a cover member joined to the case wall portion from the first axial side, The pump rotor is accommodated in a pump chamber formed between the case wall portion and the cover member in the axial direction, the second bearing abuts against the gear member from the second axial direction side, and is disposed on the second axial direction side with respect to the first gear and on the first axial direction side with respect to the cover member, the cover member includes a bearing support portion that supports the second bearing from the second axial side, The vehicle drive device according to claim 3 , wherein the bearing support portion is disposed radially outward from the pump chamber.

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