Driving device for vehicle

Abstract

To provide a driving device for a vehicle, capable of properly lubricating a frictional engagement member of an engagement device even in an electric travel mode.SOLUTION: A driving device for a vehicle includes: a first transmission system for transmitting power between an input member and an output member; a second transmission system for transmitting power between a rotary electric machine and the output member; a friction-type engagement device for connecting and disconnecting power transmission of the first transmission system; a first oil pump driven by driving force transmitted to a part at an input member side, with respect to the engagement device in the first transmission system; and a second oil pump driven by driving force transmitted in the second transmission system; and an oil supply passage 10 for supplying an oil discharged by the second oil pump to the engagement device. The engagement device includes a drum member 2 covering a friction engagement member from an outer side in a radial direction R. The oil supply passage 10 includes a supply port 10a for supplying an oil from the outer side in the radial direction R to the drum member 2. An oil hole 2a penetrating through the drum member 2 in the radial direction R is formed on at least one of a plurality of recessed portions 21 formed on an outer peripheral surface of the drum member 2.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a vehicle drive device including an input member drivingly connected to an internal combustion engine, an output member drivingly connected to wheels, a rotating electric machine that functions as a driving force source for the wheels, a friction-type engagement device that disconnects power transmission between the input member and the output member, and an oil pump. [Background technology]

[0002] In such a vehicle drive device, a differential rotation may occur between a pair of friction engagement members in the engagement device depending on the state of the engagement device, and therefore lubrication of the engagement devices is required.

[0003] The following Patent Document 1 discloses an oil supply passage (68) for supplying oil to a friction engagement member (72) of a friction-type engagement device (56). Therefore, it is conceivable that such an oil supply passage (68) can be applied to the above-mentioned vehicle drive device to lubricate the friction engagement member of the engagement device. Note that the reference numerals in parentheses in the description of the background art are those in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2009-544903 Summary of the Invention [Problem to be solved by the invention]

[0005] However, for example, when the internal combustion engine is stopped and an operating mode is selected in which the wheels are driven by the driving force of the rotating electric motor (so-called electric driving mode), the driving force of the internal combustion engine cannot be used to drive the oil pump, making it difficult to supply oil to the friction engagement member of the engagement device.

[0006] Therefore, it is desirable to realize a vehicle drive device that can appropriately lubricate the friction engagement members of the engagement device even in the electric driving mode. [Means for solving the problem]

[0007] In view of the above, the characteristic configuration of the vehicle drive device is as follows: an input member drivingly connected to the internal combustion engine; An output member drivingly connected to the wheels; a rotating electric machine that functions as a driving force source for the wheels; a first transmission system that transmits power between the input member and the output member; a second transmission system that transmits power between the rotating electric machine and the output member; a friction type engagement device that connects and disconnects the power transmission of the first transmission system; a first oil pump that is driven by a driving force transmitted to a portion of the first transmission system that is closer to the input member than the engagement device; a second oil pump driven by a driving force transmitted through the second transmission system; a supply oil passage that supplies oil discharged by the second oil pump to the engagement device, The engagement device includes a plurality of friction engagement members each formed in a plate shape, and a cylindrical drum member covering the plurality of friction engagement members from the radial outside, The oil supply passage includes a supply port that supplies oil to the drum member from the outside in the radial direction, A plurality of recesses formed on an outer circumferential surface of the drum member so as to be recessed inward in the radial direction are arranged in a distributed manner in a circumferential direction, At least one of the recesses has an oil hole formed therein, the oil hole passing through the drum member in the radial direction.

[0008] In the above-mentioned vehicle drive device, for example, in an electric travel mode, which is an operation mode in which the internal combustion engine is stopped and the wheels are driven by the driving force of the rotating electric machine transmitted through the second transmission system, a differential rotation occurs in the friction engagement member of the engagement device, and lubrication of the friction engagement member is required. However, in the electric travel mode, the first oil pump cannot be driven by the driving force of the internal combustion engine transmitted through the first transmission system. On the other hand, even in the electric travel mode, the second oil pump can be driven by the driving force of the rotating electric machine transmitted through the second transmission system. This allows the oil discharged by the second oil pump to be supplied to the outer circumferential surface of the drum member through the supply oil passage. Then, the oil supplied to the outer circumferential surface of the drum member accumulates in a plurality of recesses, and is supplied to the friction engagement member arranged inside the drum member through an oil hole formed in at least one of the recesses. Therefore, according to this characteristic configuration, the friction engagement member of the engagement device can be appropriately lubricated even in the electric travel mode. [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; [Figure 4] FIG. 2 is a diagram showing the positional relationship of components of a vehicle drive device according to an embodiment; [Diagram 5] FIG. 1 is a diagram showing the configuration of a drum member and an oil supply passage; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A vehicle drive device 100 according to an embodiment will be described below with reference to the drawings. As shown in Fig. 1 and Fig. 2, the vehicle drive device 100 includes an input member I, an output member O, a second rotating electric machine MG2, a first transmission system TS1, a second transmission system TS2, an engagement device CL, a first oil pump OP1, and a second oil pump OP2.

[0011] The input member I is drivingly connected to an 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 (a gasoline engine, a diesel engine, or the like) that is driven by the combustion of fuel to extract power.

[0012] Here, 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 shafts, gear mechanisms, belts, chains, etc. Note that the transmission members may also include engagement devices that selectively transmit rotation and driving force, such as friction engagement devices and meshing engagement devices.

[0013] The second rotating electric machine MG2 is a "rotating electric machine" that functions as a driving force source for the wheels W. The second rotating electric machine MG2 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 power generator) that receives a supply of power to generate electric power.

[0014] The output member O is drivingly connected to the wheels W. The first transmission system TS1 is configured to transmit power between the input member I and the output member O. The second transmission system TS2 is configured to transmit power between the second rotating electric machine MG2 and the output member O. The engagement device CL is a friction clutch that connects and disconnects the power transmission of the first transmission system TS1. The first oil pump OP1 is an oil pump driven by a driving force transmitted through a portion of the first transmission system TS1 that is closer to the input member I than the engagement device CL. The second oil pump OP2 is an oil pump driven by a driving force transmitted through the second transmission system TS2.

[0015] In this embodiment, the vehicle drive device 100 further includes a first rotating electric machine MG1, a differential input gear Gd, a differential gear mechanism DF, and a case 9.

[0016] The first rotating electric machine MG1 is a rotating electric machine different from the second rotating electric machine MG2. Like the second rotating electric machine MG2, the first rotating electric machine MG1 also 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 power generator) that receives a supply of power to generate electric power.

[0017] The differential input gear Gd is a gear to which the driving force from the input member I is transmitted via the first transmission system TS1 and to which the driving force from the second rotating electric machine MG2 is transmitted via the second transmission system TS2. In other words, the differential input gear Gd functions as the output member O.

[0018] The differential gear mechanism DF is configured to distribute the driving force transmitted to the differential input gear Gd to a pair of wheels W.

[0019] 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.

[0020] 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."

[0021] As shown in Fig. 1, the case 9 includes a first housing chamber CM1 and a second housing chamber CM2. The first housing chamber CM1 is a space that houses the input member I, the output member O, the first transmission system TS1, the second transmission system TS2, the differential gear mechanism DF, the engagement device CL, the first oil pump OP1, and the second oil pump OP2. The second housing chamber CM2 is a space that houses the first rotating electric machine MG1 and the second rotating electric machine MG2. In this embodiment, the first housing chamber CM1 is disposed on the second axial side L2 with respect to the second housing chamber CM2.

[0022] 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.

[0023] 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 first transmission system TS1 and the second transmission system TS2 from the axial first side L1 and to cover the first rotating electric machine MG1 and the second rotating electric machine MG2 from the axial second 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 axial first side L1.

[0024] 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 first transmission system TS1 and the second transmission system TS2 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.

[0025] 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.

[0026] 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.

[0027] The first rotating electric machine MG1 is disposed on the second axis X2. The first rotating electric machine MG1 includes a first stator ST1 and a first rotor RT1.

[0028] The first stator ST1 includes a cylindrical first stator core SC1. The first stator core SC1 is fixed to a case 9 (here, a first case portion 91).

[0029] The first rotor RT1 includes a cylindrical first rotor core RC1. The first rotor core RC1 is rotatably supported by the first stator core SC1. In this embodiment, the first rotor core RC1 is connected to the first rotor shaft RS1 so as to rotate integrally with the first rotor core RC1.

[0030] The first rotor shaft RS1 is a shaft member extending along the axial direction L. In this embodiment, the first rotor shaft RS1 is formed in a cylindrical shape 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.

[0031] 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.

[0032] 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.

[0033] The second rotating electric machine MG2 is disposed on the third axis X3. The second rotating electric machine MG2 includes a second stator ST2 and a second rotor RT2.

[0034] The second stator ST2 includes a cylindrical second stator core SC2. The second stator core SC2 is fixed to the case 9 (here, the first case portion 91).

[0035] The second rotor RT2 includes a cylindrical second rotor core RC2. The second rotor core RC2 is rotatably supported by 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 with the second rotor core RC2.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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. The differential case DC is connected to the differential input gear Gd so as to rotate integrally with the differential case DC. 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 the 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 the second differential bearing B42.

[0041] 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.

[0042] 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.

[0043] In this embodiment, the vehicle drive device 100 further includes a first input gear Gi1, a second input gear Gi2, a first counter gear Gc1, a second counter gear Gc2, a first rotor gear Gr1, and a second rotor gear Gr2.

[0044] The first input gear Gi1 is connected to the input member I so as to rotate integrally with the input member I. The first input gear Gi1 is connected to the second input gear Gi2 via the engagement device CL. The first input gear Gi1, the second input gear Gi2, and the engagement device CL are arranged on the first axis X1. In this embodiment, the first input gear Gi1, the engagement device CL, and the second input gear Gi2 are arranged in the order described from the first axial side L1 toward the second axial side L2.

[0045] In this embodiment, the first input gear Gi1 is rotatably supported by the partition wall portion 911 from the inside in the radial direction R via a first input gear bearing B51. The second input gear Gi2 is disposed on the outside in the radial direction R with respect to the input member I. The second input gear Gi2 and the input member I are supported by the second input gear bearing B52 so as to be rotatable relative to each other.

[0046] 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.

[0047] 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.

[0048] The first rotor gear Gr1 meshes with the first input gear Gi1. The first rotor gear Gr1 is connected to the first rotor shaft RS1 so as to rotate integrally with the first rotor shaft RS1. The first rotor gear Gr1 and the first rotor shaft RS1 are disposed on the second axis X2. In this manner, the first rotating electric machine MG1 is drivingly connected to a portion of the first transmission system TS1 that is closer to the input member I than the engagement device CL.

[0049] In this embodiment, the first rotor gear Gr1 is rotatably supported by the partition wall portion 911 from the inside in the radial direction R via the first rotor gear bearing B61. Furthermore, the first rotor gear Gr1 is rotatably supported by the second side wall portion 921 from the outside in the radial direction R via the second rotor gear bearing B62.

[0050] 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.

[0051] 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 first transmission system TS1, and the second rotor gear Gr2, the first counter gear Gc1, and the second counter gear Gc2 function as a second transmission system TS2.

[0052] As shown in Figures 1 and 2, the first oil pump OP1 includes a first pump rotor PR1. The first pump rotor PR1 is connected to a first rotor shaft RS1 via a connecting shaft PS1 so as to rotate integrally with the first rotor shaft RS1. The connecting shaft PS1 is a shaft member extending along the axial direction L. The first pump rotor PR1 and the connecting shaft PS1 are disposed on the second axis X2.

[0053] As shown in FIG. 2, the second oil pump OP2 includes a second pump rotor PR2. The second pump rotor PR2 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 PR2 and the pump drive gear Gp are disposed on the sixth axis X6.

[0054] As shown in Fig. 3, the engagement device CL includes a plurality of friction engagement members 1. Each of the plurality of friction engagement members 1 is formed in a plate shape. The plurality of friction engagement members 1 are arranged to line up in the axial direction L. In this embodiment, the plurality of friction engagement members 1 include a plurality of first members 11 and a plurality of second members 12. The first members 11 and the second members 12 are arranged alternately along the axial direction L to face each other in the axial direction L.

[0055] The engagement device CL is configured to be able to control the state of engagement (engaged state / disengaged state) according to the engagement pressure between the first member 11 and the second member 12. In the engagement device CL, the engagement states include a "direct engagement state" and a "slip engagement state". The direct engagement state is a state in which the first member 11 and the second member 12 are engaged with each other without differential rotation. The slip engagement state is a state in which the first member 11 and the second member 12 are engaged with each other with differential rotation.

[0056] The engagement device CL includes a drum member 2. The drum member 2 is a cylindrical member that covers the multiple friction engagement members 1 from the outside in the radial direction R. In this embodiment, the drum member 2 is formed in a cylindrical shape with a first axis X1 as its axis. The drum member 2 supports outer peripheries of the multiple first members 11 such that the multiple first members 11 cannot rotate relative to the drum member 2 but can move freely in the axial direction L.

[0057] In this embodiment, the drum member 2 is connected to the first input gear Gi1 so as to rotate integrally with the first input gear Gi1. In the illustrated example, the drum member 2 is fixed to the first input gear Gi1 so as to protrude from the first input gear Gi1 to the second axial side L2.

[0058] In this embodiment, the engagement device CL further includes a hub member 3 and a piston 4.

[0059] The hub member 3 is a cylindrical member that covers the multiple friction engagement members 1 from the inside in the radial direction R. In this embodiment, the hub member 3 is formed in a cylindrical shape with the first axis X1 as its axis. The hub member 3 supports inner peripheries of the multiple second members 12 so that the multiple second members 12 cannot rotate relative to the hub member 3 but are movable in the axial direction L.

[0060] In this embodiment, the hub member 3 is connected to the second input gear Gi2 so as to rotate integrally with the second input gear Gi2. In the illustrated example, the hub member 3 is formed integrally with the second input gear Gi2 so as to protrude from the second input gear Gi2 to the first axial side L1.

[0061] The piston 4 is a member that presses the multiple friction engagement members 1 in the axial direction L. In this embodiment, the piston 4 is disposed on a first axial side L1 with respect to the multiple friction engagement members 1. The piston 4 is supported from the outside in the radial direction R by the drum member 2 so as to be unable to rotate relatively to the drum member 2 and to be freely movable in the axial direction L.

[0062] The vehicle drive device 100 has an electric driving mode as an operating mode. The electric driving mode is an operating mode in which the internal combustion engine EG is stopped and the wheels W are driven by the driving force of the second rotating electric machine MG2 transmitted through the second transmission system TS2. In the electric driving mode, the internal combustion engine EG is stopped and the driving force of the internal combustion engine EG is not transmitted to the first transmission system TS1, so the first oil pump OP1 is not driven. On the other hand, even in the electric driving mode, the driving force of the second rotating electric machine MG2 is transmitted to the second transmission system TS2, so the second oil pump OP2 is driven.

[0063] In this embodiment, the vehicle drive device 100 further includes a series hybrid mode and a parallel hybrid mode as operation modes. The series hybrid mode is an operation mode in which the engagement device CL is in a disengaged state, and the driving force of the internal combustion engine EG is transmitted to the first rotating electric machine MG1 to generate electricity, while the wheels W are driven by the driving force of the second rotating electric machine MG2. The parallel hybrid mode is an operation mode in which the engagement device CL is in an engaged state, and the wheels W are driven by the driving forces of both the internal combustion engine EG and the second rotating electric machine MG2.

[0064] As shown in Fig. 4 and Fig. 5, the vehicle drive device 100 includes an oil supply passage 10. The oil supply passage 10 is an oil passage that supplies the oil discharged by the second oil pump OP2 to the engagement device CL. In this embodiment, the oil supply passage 10 is configured by a pipe member through which the oil flows. Note that the black arrows in Fig. 4 and Fig. 5 indicate the flow of oil supplied from the oil supply passage 10 to the engagement device CL.

[0065] In the following description, when the vehicle equipped with the vehicle driving device 100 is located on a horizontal plane, the direction along the vertical direction is referred to as the "up-down direction V". The upper side in the vertical direction is referred to as the "upper side V1", and the lower side in the vertical direction is referred to as the "lower side V2". When the vehicle equipped with the vehicle driving device 100 is located on a horizontal plane, the direction along the horizontal direction and perpendicular to the axial direction L is referred to as the "front-rear direction D". One side of the front-rear direction D is referred to as the "front side D1", and the other side of the front-rear direction D is referred to as the "rear side D2". Each of the up-down direction V and the front-rear direction D corresponds to a specific direction in the radial direction R.

[0066] 4, in this embodiment, the first axis X1, the second axis X2, and the sixth axis X6 are disposed on the rear side D2 with respect to the third axis X3, the fifth axis X5, and the fourth axis X4. The first axis X1 is disposed on the upper side V1 with respect to the second axis X2, and the sixth axis X6 is disposed on the lower side V2 with respect to the second axis X2. The third axis X3 is disposed on the upper side V1 with respect to the fifth axis X5, and the fourth axis X4 is disposed on the lower side V2 with respect to the fifth axis X5.

[0067] In this embodiment, the supply oil passage 10 extends from the second oil pump OP2 to the front side D1 so as to pass through the lower side V2 with respect to the fourth axis X4. The supply oil passage 10 extends from the lower side V2 with respect to the fourth axis X4 to the upper side V1 so as to pass through the front side D1 with respect to the fourth axis X4, the fifth axis X5, and the third axis X3. Furthermore, the supply oil passage 10 extends from the front side D1 with respect to the third axis X3 to the upper side V1 with respect to the drum member 2, passing through the upper side V1 with respect to the third axis X3.

[0068] As shown in Fig. 5, the oil supply passage 10 has a supply port 10a that supplies oil to the drum member 2 from the outside in the radial direction R. In this embodiment, the supply port 10a is disposed on the upper side V1 of the drum member 2 at a position overlapping with the drum member 2 when viewed in the up-down direction V. Therefore, in this embodiment, oil in the oil supply passage 10 is dripped from the supply port 10a onto the outer circumferential surface of the drum member 2. Here, with regard to the arrangement of two elements, "overlapping when viewed in a specific direction" refers to the presence of at least a part 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.

[0069] A plurality of recesses 21 formed to be recessed inward in the radial direction R are disposed on the outer circumferential surface of the drum member 2 and are distributed in the circumferential direction C. In this embodiment, the plurality of recesses 21 are disposed at equal intervals over the entire area of ​​the drum member 2 in the circumferential direction C. Here, the circumferential direction C is a direction along a circumference centered on the rotation axis of the drum member 2 (here, the first axis X1).

[0070] An oil hole 2a penetrating the drum member 2 in the radial direction R is formed in at least one of the multiple recesses 21. In this embodiment, the oil holes 2a are formed in all of the recesses 21 such that one oil hole 2a is located in one recess 21. In this embodiment, the multiple oil holes 2a are arranged such that the positions in the axial direction L of the oil holes 2a adjacent to each other in the circumferential direction C are different from each other.

[0071] The second oil pump OP2 sucks and discharges oil stored in the case 9. The oil discharged from the second oil pump OP2 is supplied to the outer circumferential surface of the drum member 2 through an oil supply passage 10. The oil supplied to the outer circumferential surface of the drum member 2 accumulates in a recess 21 and is supplied to the friction engagement member 1 arranged on the inside in the radial direction R with respect to the drum member 2 through an oil hole 2a formed in the recess 21. In this embodiment, at least a part of the oil supplied to the friction engagement member 1 is supplied to the second input gear bearing B52.

[0072] In this embodiment, a plurality of protrusions 22 formed to protrude inward in the radial direction R are distributed and disposed in the circumferential direction C on the inner peripheral surface of the drum member 2. As shown in Fig. 3, the plurality of protrusions 22 are configured to be able to engage with some of the plurality of friction engagement members 1 (here, the first members 11).

[0073] 3 and 5, in this embodiment, each of the multiple recesses 21 is arranged to overlap with each of the multiple protrusions 22 when viewed in the radial direction along the radial direction R. That is, in this embodiment, multiple protrusions 22 for engaging with some of the multiple friction engagement members 1 are formed on the inner circumferential surface of the drum member 2, and multiple recesses 21 are formed on the outer circumferential surface of the drum member 2 corresponding to the multiple protrusions 22.

[0074] In the illustrated example, the multiple protrusions 22 are multiple spline teeth extending in the axial direction L. A plurality of spline teeth that engage with the multiple protrusions 22 are formed on the outer periphery of the multiple first members 11, dispersed in the circumferential direction C so as to extend in the axial direction L. In this manner, the multiple protrusions 22 and the multiple spline teeth formed on the outer periphery of the multiple first members 11 engage with each other, whereby the multiple first members 11 are supported by the drum member 2 so as to be unable to rotate relative to the drum member 2 and to be freely movable in the axial direction L.

[0075] In this embodiment, the oil discharged from the second oil pump OP2 is supplied to the drum member 2 described above, as well as to the second differential bearing B42, the second counter bearing B72, the first counter bearing B71, the sixth rotor bearing B34, and the fifth rotor bearing B33 through oil passages not shown (see FIG. 1).

[0076] Furthermore, in this embodiment, when the first oil pump OP1 is driven, oil stored in the case 9 is sucked through a strainer SR (see FIG. 4) and discharged from the first oil pump OP1. The oil discharged from the first oil pump OP1 passes through an oil cooler (not shown) that cools the oil, and is then supplied to the first coil end portion CE1 of the first rotating electric machine MG1 and the second coil end portion CE2 of the second rotating electric machine MG2. The strainer SR is a filter that sucks in the oil stored in the case 9 and removes foreign matter contained in the oil when the first oil pump OP1 is driven.

[0077] Furthermore, the oil discharged from the first oil pump OP1 passes through an oil cooler and is supplied to the second rotor bearing B22 and the inside of the first rotor shaft RS1. Then, the oil supplied to the inside of the first rotor shaft RS1 passes through a through hole penetrating the first rotor shaft RS1 in the radial direction R and is supplied to the first rotor core RC1.

[0078] Moreover, the oil discharged from the first oil pump OP1 is supplied to the first input gear bearing B51 and an oil passage formed inside the input member I. The oil supplied to the oil passage formed inside the input member I is supplied to the multiple friction engagement members 1 from the inside in the radial direction R, and is also supplied to the second input gear bearing B52 and the input bearing B11. Moreover, the oil discharged from the first oil pump OP1 is also supplied to the hydraulic hydraulic chamber of the engagement device CL (the hydraulic chamber for driving the piston 4).

[0079] Moreover, the oil discharged from the first oil pump OP1 is supplied to the second rotor gear bearing B62, the first rotor gear bearing B61, and the first rotor bearing B21.

[0080] As described above, the vehicle drive device 100 has the following features: an input member I drivingly connected to an internal combustion engine EG; An output member O drivingly connected to a wheel W; A second rotating electric machine MG2 that functions as a driving force source for the wheels W; A first transmission system TS1 that transmits power between an input member I and an output member O; a second transmission system TS2 that transmits power between the second rotating electric machine MG2 and the output member O; a friction-type engagement device CL that connects and disconnects the power transmission of the first transmission system TS1; a first oil pump OP1 that is driven by a driving force transmitted to a portion of the first transmission system TS1 that is closer to the input member I than the engagement device CL; a second oil pump OP2 driven by a driving force transmitted through a second transmission system TS2; a supply oil passage 10 that supplies oil discharged by the second oil pump OP2 to the engagement device CL, The engagement device CL includes a plurality of friction engagement members 1 each formed in a plate shape, and a cylindrical drum member 2 covering the plurality of friction engagement members 1 from the outside in the radial direction R. The oil supply passage 10 includes a supply port 10a for supplying oil to the drum member 2 from the outside in the radial direction R. A plurality of recesses 21 are formed on the outer circumferential surface of the drum member 2 so as to be recessed inward in the radial direction R and are distributed in the circumferential direction C. An oil hole 2a penetrating the drum member 2 in the radial direction R is formed in at least one of the recesses 21.

[0081] In the vehicle drive device 100 having the above-described configuration, for example, in an electric travel mode in which the internal combustion engine EG is stopped and the wheels W are driven by the driving force of the second rotating electric machine MG2 transmitted through the second transmission system TS2, a differential rotation occurs in the friction engagement member 1 of the engagement device CL, and therefore lubrication of the friction engagement member 1 is required. However, in the electric travel mode, the first oil pump OP1 cannot be driven by the driving force of the internal combustion engine EG transmitted through the first transmission system TS1. On the other hand, even in the electric travel mode, the second oil pump OP2 can be driven by the driving force of the second rotating electric machine MG2 transmitted through the second transmission system TS2. This allows the oil discharged by the second oil pump OP2 to be supplied to the outer circumferential surface of the drum member 2 through the supply oil passage 10. The oil supplied to the outer circumferential surface of the drum member 2 is collected in a plurality of recesses 21, and is supplied to the friction engagement member 1 arranged inside the drum member 2 through an oil hole 2a formed in at least one of the recesses 21. Therefore, according to this configuration, the friction engagement member 1 of the engagement device CL can be appropriately lubricated even in the electric power traveling mode.

[0082] As described above, in this embodiment, the inner circumferential surface of the drum member 2 is formed so as to protrude inward in the radial direction R, and a plurality of protrusions 22 for engaging with some of the plurality of friction engagement members 1 are arranged in a dispersed manner in the circumferential direction C. Each of the plurality of recesses 21 is disposed so as to overlap with each of the plurality of protrusions 22 when viewed in the radial direction R.

[0083] According to this configuration, by forming a plurality of protrusions 22 for engaging with some of the plurality of friction engagement members 1 on the inner peripheral surface of the drum member 2, a plurality of recesses 21 can be formed on the outer peripheral surface of the drum member 2 corresponding to the plurality of protrusions 22. Therefore, since there is no need to separately form a plurality of recesses 21 on the outer peripheral surface of the drum, it is easy to reduce the cost of the drum member 2.

[0084] In this embodiment, the plurality of friction engagement members 1 are arranged in the axial direction L along the rotation axis of the drum member 2, The multiple oil holes 2a are arranged such that the positions in the axial direction L of the oil holes 2a adjacent to each other in the circumferential direction C are different from each other.

[0085] According to this configuration, the plurality of friction engagement members 1 aligned in the axial direction L can be easily lubricated uniformly.

[0086] In this embodiment, the vehicle drive device 100 includes: a first rotating electric machine MG1 different from a second rotating electric machine MG2; a differential input gear Gd as an output member O to which a driving force from an input member I is transmitted via a first transmission system TS1 and to which a driving force from a second rotating electric machine MG2 is transmitted via a second transmission system TS2; A differential gear mechanism DF that distributes the driving force transmitted to the differential input gear Gd to a pair of wheels W, The first rotating electric machine MG1 is drivingly connected to a portion of the first transmission system TS1 that is closer to the input member I than the engagement device CL, The second oil pump OP2 is driven by a differential input gear Gd.

[0087] According to this configuration, when the engagement device CL is in the disengaged state, in addition to the electric driving mode, which is an operating mode in which the internal combustion engine EG is stopped and the wheels W are driven by the driving force of the second rotating electric machine MG2 transmitted through the second transmission system TS2, it is also possible to realize a series hybrid mode, which is an operating mode in which the driving force of the internal combustion engine EG is transmitted to the first rotating electric machine MG1 to generate electricity while the wheels W are driven by the driving force of the second rotating electric machine MG2. Furthermore, according to this configuration, because the second oil pump OP2 is driven by the differential input gear Gd, oil can be discharged from the second oil pump OP2 to supply oil to each part regardless of the operating mode in a driving state in which the wheels W are rotating. Therefore, for example, even in a situation in which a differential rotation occurs in the friction engagement member 1 of the engagement device CL while the electric driving mode or the series hybrid mode is being executed, the oil discharged from the second oil pump OP2 can be supplied to the friction engagement member 1 of the engagement device CL, and the friction engagement member 1 can be appropriately lubricated.

[0088] Other embodiments (1) In the above embodiment, a configuration in which the oil supply passage 10 is formed using a pipe member has been described as an example. However, the present invention is not limited to such a configuration, and for example, the oil supply passage 10 may be formed within the wall of the case 9 without using a pipe member. Alternatively, the oil supply passage 10 may be configured to include a portion formed using a pipe member and a portion formed within the wall of the case 9.

[0089] (2) In the above embodiment, the supply port 10a of the oil supply passage 10 is disposed on the upper side V1 with respect to the drum member 2, and oil is dripped from the supply port 10a onto the outer circumferential surface of the drum member 2. However, the present invention is not limited to such a configuration, and for example, the supply port 10a of the oil supply passage 10 may be disposed on at least one of the front side D1 and the rear side D2 with respect to the drum member 2, and oil may be sprayed from the supply port 10a toward the drum member 2.

[0090] (3) In the above embodiment, a configuration has been described in which the multiple recesses 21 are arranged at equal intervals over the entire area of ​​the drum member 2 in the circumferential direction C. However, the present invention is not limited to such a configuration, and the multiple recesses 21 may be arranged only in a partial area of ​​the drum member 2 in the circumferential direction C. Also, the multiple recesses 21 may be arranged at different intervals in the circumferential direction C.

[0091] (4) In the above embodiment, an example has been described in which the oil holes 2a are formed in all of the recesses 21 such that one oil hole 2a is located in one recess 21. However, the present invention is not limited to such a configuration, and multiple oil holes 2a may be formed in one recess 21. Furthermore, the oil holes 2a may be formed in only some of the multiple recesses 21.

[0092] (5) 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]

[0093] The technology disclosed herein can be utilized in a vehicle drive system that includes an input member drivingly connected to an internal combustion engine, an output member drivingly connected to wheels, a rotating electric machine that functions as a driving force source for the wheels, a friction-type engagement device that disconnects power transmission between the input member and the output member, and an oil pump. [Explanation of symbols]

[0094] 100: vehicle drive device, 1: friction engagement member, 2: drum member, 2a: oil hole, 21: recess, 22: protrusion, 10: oil supply passage, 10a: supply port, I: input member, O: output member, MG1: first rotating electric machine, MG2: second rotating electric machine (rotating electric machine), TS1: first transmission system, TS2: second transmission system, CL: engagement device, OP1: first oil pump, OP2: second oil pump, EG: internal combustion engine, W: wheel, L: axial direction, R: radial direction, C: circumferential direction

Claims

1. an input member drivingly connected to the internal combustion engine; An output member drivingly connected to the wheels; a rotating electric machine that functions as a driving force source for the wheels; a first transmission system that transmits power between the input member and the output member; a second transmission system that transmits power between the rotating electric machine and the output member; a friction type engagement device that connects and disconnects the power transmission of the first transmission system; a first oil pump that is driven by a driving force transmitted through a portion of the first transmission system that is located on the input member side relative to the engagement device; a second oil pump driven by a driving force transmitted through the second transmission system; a supply oil passage that supplies oil discharged by the second oil pump to the engagement device, The engagement device includes a plurality of friction engagement members each formed in a plate shape, and a cylindrical drum member covering the plurality of friction engagement members from the radial outside, The oil supply passage includes a supply port that supplies oil to the drum member from the outside in the radial direction, A plurality of recesses formed on an outer circumferential surface of the drum member so as to be recessed inward in the radial direction are arranged in a distributed manner in a circumferential direction, An oil hole penetrating the drum member in the radial direction is formed in at least one of the recesses.

2. a plurality of protrusions are formed on an inner peripheral surface of the drum member so as to protrude inward in the radial direction and are arranged in a distributed manner in the circumferential direction with which some of the plurality of friction engagement members are engaged; The vehicle drive device according to claim 1 , wherein each of the plurality of recesses is arranged so as to overlap with each of the plurality of protrusions when viewed in the radial direction.

3. The friction engagement members are arranged in a line in an axial direction along a rotation axis of the drum member, 3 . The vehicle drive device according to claim 1 , wherein the plurality of oil holes are arranged such that positions of the oil holes adjacent in the circumferential direction in the axial direction are different from each other.

4. a first rotating electric machine different from the rotating electric machine as a second rotating electric machine; a differential input gear as the output member to which a driving force from the input member is transmitted via the first transmission system and to which a driving force from the second rotating electric machine is transmitted via the second transmission system; a differential gear mechanism that distributes the driving force transmitted to the differential input gear to the pair of wheels, the first rotating electric machine is drivingly connected to a portion of the first transmission system closer to the input member than the engagement device, The vehicle drive device according to claim 1 or 2, wherein the second oil pump is driven by the differential input gear.

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