Vehicle drive device

Abstract

This vehicle drive device comprises a first oil accepting portion (7) disposed below a rotary electrical machine (2), an oil supply passage (70) for supplying oil that has accumulated in the first oil accepting portion (7) to locations to be lubricated, from inflow ports (79), and a discharge port (4) for discharging the oil in the first oil accepting portion (7), wherein the discharge port (4) is provided above a reference oil level (P0) that is set below a rotor (2r) and above the inlet ports (70), so as to have a part positioned below a restriction target oil level (Q) that is inclined as a result of a change in attitude and acceleration / deceleration of a vehicle.

Description

[Technical field]

[0001] The present invention relates to a vehicle drive device comprising an input member arranged on a first shaft and drivingly connected to an internal combustion engine, an output member drivingly connected to wheels, a rotating electric machine arranged on a second shaft and equipped with a rotor, and a power transmission mechanism that transmits power between them, wherein the second shaft is arranged above the first shaft. [Background technology]

[0002] JP 2017-114477 A (Patent Document 1) discloses a technology for lubrication of a vehicle drive device in a hybrid vehicle equipped with an internal combustion engine and a rotating electric machine as a drive power source for the wheels. This vehicle is equipped with an oil pump (electric oil pump) driven by a drive power source other than the drive power source for the wheels, and some mechanisms of the vehicle drive device are lubricated by oil supplied from this oil pump. Note that lubrication also includes cooling. In addition, since the oil scooped up by the rotating gears can also lubricate other lubrication target points, lubrication by oil supplied from the oil pump also includes lubrication of other lubrication target points such as other gears by oil after lubricating one gear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-114477 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the hybrid vehicle described above, the internal combustion engine may rotate the rotating electric machine to generate electricity while the wheels are stopped. In this case, the power transmission mechanism is controlled so that the gears driving the wheels do not rotate. For this reason, the oil may not be supplied to the lubrication target parts to which the lubricating oil is supplied by the scooping up, resulting in insufficient lubrication. Therefore, it is also possible to collect the oil that flows down after cooling the rotating electric machine and guide this oil to the lubrication target parts. In order to effectively receive the oil, it is preferable to provide an oil receiving part that collects the oil below the rotating electric machine. However, if the oil level in the oil receiving part is tilted due to a change in the vehicle's attitude or acceleration, the rotor of the rotating electric machine and the oil stored in the oil receiving part may interfere with each other. If the oil is agitated due to this interference, various effects may occur, such as a reduction in the efficiency of the rotating electric machine due to the rotor's rotation resistance, a reduction in the amount of heat exchange due to oil foaming, and a reduction in the discharge pressure and flow rate of the oil pump due to air bubbles generated in the oil.

[0005] In light of the above background, it is desirable to realize a vehicle drive device that can store oil after cooling the rotating electric machine, while minimizing interference with the rotor when the oil level of the stored oil tilts due to a change in vehicle posture or acceleration, etc., and can appropriately supply oil to points that need to be lubricated other than the rotating electric machine. [Means for solving the problem]

[0006] In view of the above, a vehicle drive device is provided which includes an input member drivingly connected to an internal combustion engine and arranged on a first axis, an output member drivingly connected to wheels, a rotating electric machine arranged on a second axis separate from the first axis and parallel to the first axis and having a rotor, and a power transmission mechanism which transmits power between the input member, the output member, and the rotating electric machine, and which includes an oil receiving portion arranged below the rotating electric machine to receive cooling oil supplied to the rotating electric machine and dropping from the rotating electric machine, an oil supply passage which supplies the oil accumulated in the oil receiving portion to a lubrication target point from an inlet formed facing the oil receiving portion, and an outlet formed facing the oil receiving portion for discharging the oil from the oil receiving portion, and the outlet is arranged to have a portion located in the oil receiving portion above a reference oil level set below the rotor and above the inlet, and below a restricted oil level which is an oil level that has come into contact with the rotor due to tilting caused by changes in vehicle posture and acceleration / deceleration.

[0007] According to this configuration, the oil supplied for cooling the rotating electric machine can be used to lubricate the lubrication target parts. Therefore, it is not necessary to provide a separate oil supply source, such as an oil pump, for lubrication of the lubrication target parts. Furthermore, according to this configuration, even if the oil level in the oil receiver is tilted due to a change in the vehicle's attitude or acceleration / deceleration caused by going uphill, going downhill, turning, etc., the oil level can be easily maintained below the lower end of the rotor. Therefore, it is easy to avoid an increase in the rotational resistance of the rotor caused by the oil in the oil receiver being stirred by the rotor, and a decrease in the heat exchange amount caused by oil foaming. Thus, according to this configuration, it is possible to realize a vehicle drive device that can store the oil after cooling the rotating electric machine and appropriately supply the oil to the lubrication target parts other than the rotating electric machine while minimizing interference with the rotor when the oil level of the stored oil is tilted due to a change in the vehicle's attitude or acceleration, etc.

[0008] Further features and advantages of the drive device for a vehicle will become apparent from the following description of an exemplary and non-limiting embodiment, which is given with reference to the drawings. [Brief description of the drawings]

[0009] [Figure 1] Skeleton diagram of a vehicle drive system [Diagram 2] Partial sectional view of a vehicle drive device [Diagram 3] Schematic cross-sectional view of the first chamber viewed from the side facing the partition wall along the axial direction. [Figure 4] Schematic cross-sectional view of the second chamber viewed from the side facing the partition wall along the axial direction. [Diagram 5] FIG. 2 is a diagram showing the relationship between the oil level (reference oil level) and the rotor, the outlet, and the inlet when the vehicle is positioned on a horizontal plane as viewed in the axial direction. [Figure 6] FIG. 2 is a diagram showing a schematic diagram of the relationship between the oil level, the rotor, the outlet, and the inlet when the vehicle is tilted to one side in the front-rear direction as viewed in the axial direction. [Figure 7] FIG. 2 is a diagram showing a schematic diagram of the relationship between the oil level, the rotor, the outlet, and the inlet when the vehicle is tilted to the other side in the front-rear direction as viewed in the axial direction. [Figure 8] FIG. 2 is a diagram showing a schematic diagram of the relationship between the oil level (reference oil level) and the rotor, the outlet, and the inlet when the vehicle is positioned on a horizontal plane as viewed in a direction perpendicular to the axis. [Figure 9] FIG. 2 is a diagram showing a schematic diagram of the relationship between the oil level, the rotor, the outlet, and the inlet when the vehicle is tilted to one side in the left-right direction as viewed in a direction perpendicular to the axis. [Figure 10] FIG. 2 is a diagram showing a schematic diagram of the relationship between the oil level, the rotor, the outlet, and the inlet when the vehicle is tilted to the other side in the left-right direction as viewed in the direction perpendicular to the axis. [Figure 11] FIG. 11 is a schematic cross-sectional view showing another example of the configuration of the oil receiving portion, in which the first chamber is viewed from the side facing the partition wall along the axial direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the vehicle drive device will be described with reference to the drawings. In the following description, the directions of each member (vertical direction V, axial direction L, width direction H) are based on the directions when the vehicle is positioned on a horizontal surface (reference posture) and the members are assembled to the vehicle drive device. In addition, terms related to the dimensions, arrangement direction, arrangement position, etc. of each member are concepts that include a state having a difference due to an error (an error that can be tolerated in manufacturing). In this embodiment, a case where the posture of the vehicle changes from the horizontal state due to climbing, descending, turning, etc. will also be described, but the direction in that case may differ from the direction in the reference posture. For example, when the vehicle is in a horizontal state, the vertical direction V and the direction perpendicular to the horizontal surface (vertical direction) coincide with each other, but when the vehicle is inclined from the horizontal state, the vertical direction V and the vertical direction do not coincide with each other. Therefore, the expression "vertical direction" may be used in addition to the vertical direction V as appropriate.

[0011] In addition, in this specification, "driving connection" refers to a state in which two rotating elements are connected so as to be able to transmit a driving force (synonymous with torque), 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 (e.g., shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at a variable speed, and may also include engagement devices (e.g., friction engagement devices, meshing engagement devices, etc.) that selectively transmit rotation and driving force.

[0012] In this specification, the term "rotating electric machine" is used as a concept including a motor, a generator, and a motor-generator that functions as both a motor and a generator as necessary. In this specification, the term "overlapped when viewed in a specific direction" in relation to the arrangement of two components means that when a virtual line parallel to the line of sight is moved in each direction perpendicular to the virtual line, there is at least a part of an area where the virtual line intersects with both of the two components. In this specification, the term "axial arrangement areas overlap" in relation to the arrangement of two components means that the axial arrangement area of ​​one component includes at least a part of the axial arrangement area of ​​the other component.

[0013] As shown in FIG. 1, the vehicle drive device 100 includes a first rotating electric machine 1, a second rotating electric machine 2, a first input member 11 drivingly connected to an internal combustion engine 3, an output member 5 drivingly connected to a wheel W, a second input member 12 drivingly connected to the second rotating electric machine 2, and a third input member 13 drivingly connected to the first rotating electric machine 1. The first rotating electric machine 1 includes a first stator 1s fixed to a fixed member such as a case 9, and a first rotor 1r arranged radially inside the first stator 1s. The second rotating electric machine 2 includes a second stator 2s fixed to a fixed member such as a case 9, and a second rotor 2r arranged radially inside the second stator 2s. The internal combustion engine 3 is a prime mover (e.g., a gasoline engine, a diesel engine, etc.) that is driven by the combustion of fuel inside the engine to extract power. The first rotating electric machine 1 and the second rotating electric machine 2 are electrically connected to an electricity storage device (not shown) such as a battery or a capacitor, and are powered by receiving electric power from the electricity storage device, or are supplied with and stored in the electricity storage device electric power generated by the inertial force of the vehicle or the driving force of the internal combustion engine 3. The first rotating electric machine 1 and the second rotating electric machine 2 are electrically connected to a common electricity storage device, and the second rotating electric machine 2 can be powered by electric power generated by the first rotating electric machine 1.

[0014] In this embodiment, the third input member 13 is connected to the first rotor 1r of the first rotating electric machine 1 so as to rotate integrally therewith, and the second input member 12 is connected to the second rotor 2r of the second rotating electric machine 2 so as to rotate integrally therewith. In addition, in this embodiment, the first input member 11 is connected to the internal combustion engine 3 (specifically, an output member such as a crankshaft of the internal combustion engine 3, the same applies below) via a torque limiter TL (see FIG. 2). The torque limiter TL limits the magnitude of the torque transmitted between the first input member 11 and the internal combustion engine 3 to block the transmission of excessive torque. When a damper device with a torque limiter TL (a damper device having a damper mechanism and a torque limiter TL) is used, the first input member 11 is connected to the internal combustion engine 3 via the torque limiter TL and the damper mechanism.

[0015] As shown in Fig. 2, the vehicle drive device 100 includes a case 9, and a first input member 11, a second input member 12, and a third input member 13 are housed in the case 9. Here, "house" means housing at least a part of an object to be housed. Each of the first input member 11, the second input member 12, and the third input member 13 is supported by the case 9 so as to be rotatable relative to the case 9. The case 9 also houses a differential gear unit 6, a first counter gear mechanism 31, and a second counter gear mechanism 32, which will be described later.

[0016] 2, the case 9 includes a first chamber 91 that houses the first rotating electric machine 1 and the second rotating electric machine 2, and a second chamber 92 that houses the power transmission mechanism 20. The first chamber 91 and the second chamber 92 are partitioned by a partition wall 95. The case 9 includes a main body case 97 on which the partition wall 95 is formed, a rotating electric machine side cover case (not shown) that abuts against the main body case 97 from a first axial side L1 to form the first chamber 91 together with the main body case 97, and a transmission mechanism side cover case 96 that abuts against the main body case 97 from a second axial side L2 to form the second chamber 92 together with the main body case 97.

[0017] The vehicle drive device 100 includes a differential gear device 6. As shown in FIG. 1, the differential gear device 6 includes a differential input gear GD, and distributes the rotation of the differential input gear GD to a pair of output members 5 each of which is drivingly connected to a wheel W. If the wheel W to which one output member 5 is drivingly connected is the first wheel, and the wheel W to which the other output member 5 is drivingly connected is the second wheel, the first wheel and the second wheel are a pair of left and right wheels W (for example, a pair of left and right front wheels, or a pair of left and right rear wheels). In this embodiment, the output members 5 are drive shafts, and each of the output members 5 is connected to the wheel W to be connected so as to rotate at the same speed as the wheel W. The output members 5 are connected to the wheel W to be connected, for example, via a constant velocity joint (not shown). The wheel W is driven by the torque transmitted via the output member 5, and the vehicle (the vehicle on which the vehicle drive device 100 is mounted, the same applies below) runs.

[0018] 2, in this embodiment, the differential gear device 6 includes a bevel gear type differential gear mechanism 40 and a differential case 47 that houses the differential gear mechanism 40. The differential case 47 is supported by the case 9 so as to be rotatable relative to the case 9. The differential input gear GD is coupled to the differential case 47 so as to rotate integrally with the differential case 47. Specifically, the differential input gear GD is attached to the differential case 47 so as to protrude outward in the radial direction (the radial direction based on a fourth axis A4 described later) from the differential case 47.

[0019] The differential gear mechanism 40 includes a pinion gear 43 and a pair of side gears 44 that mesh with the pinion gears 43, respectively. The pinion gears 43 (for example, two pinion gears 43) are supported by a pinion shaft 48 held in a differential case 47 so as to be rotatable relative to the pinion shaft 48. The differential gear mechanism 40 distributes the rotation of the differential input gear GD to the pair of side gears 44. Each of the side gears 44 is connected (spline-connected in this case) to the output member 5 to be connected thereto so as to rotate integrally with the output member 5.

[0020] As shown in FIG. 1 and FIG. 2, the first input member 11 is disposed on the first axis A1, the second input member 12 is disposed on the second axis A2, the third input member 13 is disposed on the third axis A3, the differential gear device 6 is disposed on the fourth axis A4, the first counter gear mechanism 31 described later is disposed on the fifth axis A5, and the second counter gear mechanism 32 described later is disposed on the sixth axis A6. The first axis A1, the second axis A2, the third axis A3, the fourth axis A4, the fifth axis A5, and the sixth axis A6 are different axes (virtual axes) and are disposed parallel to each other. The direction parallel to each of these axes (A1 to A6) (i.e., the axial direction common to each axis) is defined as the axial direction L. One side of the axial direction L is defined as the first axial side L1, and the other side of the axial direction L (the opposite side of the first axial side L1 in the axial direction L) is defined as the second axial side L2.

[0021] 1, the first input member 11 is disposed on a first axial side L1 with respect to the internal combustion engine 3. The third input member 13 is disposed on a second axial side L2 with respect to the first rotating electric machine 1, and the second input member 12 is disposed on the second axial side L2 with respect to the second rotating electric machine 2.

[0022] As shown in FIG. 1, the vehicle drive device 100 includes a first gear mechanism 21 that drivably connects the first input member 11 and the third input member 13 and also drivably connects the first input member 11 and the differential input gear GD. The first gear mechanism 21 drivably connects the third input member 13 and the differential input gear GD via the first input member 11. That is, the first gear mechanism 21 transmits driving force between the first input member 11, which is drivably connected to the internal combustion engine 3, and the first rotating electric machine 1. The first power transmission path, which is a power transmission path between the third input member 13 and the first input member 11, and the third power transmission path, which is a power transmission path between the first input member 11 and the differential input gear GD, can be connected using the first gear mechanism 21. The third power transmission path is selectively connected (i.e., connected or disconnected) by a first switching mechanism 51 described later. On the other hand, in this embodiment, the first power transmission path is always connected.

[0023] The vehicle drive device 100 also includes a second gear mechanism 22 that drivingly connects the second input member 12 and the differential input gear GD. The second gear mechanism 22 drivingly connects the second input member 12 and the differential input gear GD without the first gear mechanism 21. A second power transmission path, which is a power transmission path between the second input member 12 and the differential input gear GD, can be connected using the second gear mechanism 22. That is, the second gear mechanism 22 transmits driving force between the second rotating electric machine 2 and the output member 5. In this embodiment, the second power transmission path is selectively connected by a second switching mechanism 52 described later.

[0024] With the third power transmission path interrupted and the second power transmission path connected, the vehicle drive device 100 can realize an electric driving mode and a series mode. The electric driving mode is a driving mode in which the output member 5 is driven by the driving force of the second rotating electric machine 2 to drive the vehicle. The series mode is a driving mode in which the first rotating electric machine 1 is caused to generate electricity by the driving force of the internal combustion engine 3 and the output member 5 is driven by the driving force of the second rotating electric machine 2 to drive the vehicle. In the electric driving mode and the series mode, the third power transmission path is interrupted and the first rotating electric machine 1 and the internal combustion engine 3 are separated from the output member 5.

[0025] Moreover, in a state in which the second power transmission path and the third power transmission path are connected, the vehicle drive device 100 can realize a parallel mode. The parallel mode is a driving mode in which the output member 5 is driven by at least the driving force of the internal combustion engine 3 to drive the vehicle. In the parallel mode, the driving force of the second rotating electric machine 2 is transmitted to the output member 5 as necessary to assist the driving force of the internal combustion engine 3. When the second rotating electric machine 2 is stopped in the parallel mode (for example, when the vehicle is running at high speed), the second rotating electric machine 2, which is drivingly connected to the differential input gear GD without passing through the first input member 11, can be disconnected from the differential input gear GD by interrupting the second power transmission path. Therefore, when the second rotating electric machine 2 is stopped in the parallel mode, it is possible to avoid co-rotation of the second rotating electric machine 2, and as a result, it is possible to suppress the occurrence of energy loss due to dragging of the second rotating electric machine 2. In addition, in the parallel mode, the driving force of the first rotating electric machine 1 may be transmitted to the output member 5 in addition to or instead of the driving force of the second rotating electric machine 2, to assist the driving force of the internal combustion engine 3.

[0026] The first gear mechanism 21 and the second gear mechanism 22 correspond to a power transmission mechanism 20 that changes the power transmission state between the third input member 13, the output member 5, the first rotating electric machine 1, and the second rotating electric machine 2 to transmit power therebetween. As described above, the series mode is an operation mode in which a driving force is transmitted between the first input member 11 and the first rotating electric machine 1, and a driving force is transmitted between the second rotating electric machine 2 and the output member 5. The parallel mode is an operation mode in which a driving force is transmitted between the first input member 11, the second rotating electric machine 2, and the output member 5. The power transmission mechanism 20 is capable of executing at least two operation modes, the series mode and the parallel mode.

[0027] As shown in FIG. 1, the first gear mechanism 21 includes a third input gear G9 arranged coaxially with the third input member 13, and a first input gear G10 arranged coaxially with the first input member 11 and meshing with the third input gear G9. In this embodiment, the third input gear G9 is connected to the third input member 13 so as to rotate integrally with the third input member 13, and the first input gear G10 is connected to the first input member 11 so as to rotate integrally with the first input member 11. That is, in this embodiment, the third input member 13 and the first input member 11 are constantly connected to each other via the gear pair of the third input gear G9 and the first input gear G10, so that the first power transmission path between the third input member 13 and the first input member 11 is constantly connected.

[0028] 1 and 2, in this embodiment, the third input gear G9 is formed to have a smaller diameter than the first input gear G10. That is, the gear ratio between the third input gear G9 and the first input gear G10 is set so that the rotation of the third input member 13 is decelerated and transmitted to the first input member 11 (in other words, the rotation of the first input member 11 is accelerated and transmitted to the third input member 13).

[0029] The first gear mechanism 21 further includes a first gear G1 and a second gear G2, each of which is arranged coaxially with the first input member 11, and a first counter gear mechanism 31. The first gear G1 is arranged on the first axial side L1 relative to the second gear G2. The first counter gear mechanism 31 includes a first counter shaft 31a, a third gear G3 meshing with the first gear G1, a fourth gear G4 meshing with the second gear G2, and a fifth gear G5 that rotates integrally with the first counter shaft 31a and meshes with the differential input gear GD. The third gear G3 is arranged on the first axial side L1 relative to the fourth gear G4. In this embodiment, the fifth gear G5 is arranged between the third gear G3 and the fourth gear G4 in the axial direction L.

[0030] 1 and 2, in this embodiment, the fifth gear G5 is formed to have a smaller diameter than the differential input gear GD. That is, the gear ratio between the fifth gear G5 and the differential input gear GD is set so that the rotation of the first counter shaft 31a is reduced in speed and transmitted to the differential gear device 6 (specifically, the differential input gear GD).

[0031] The first gear mechanism 21 is provided with a first switching mechanism 51 that switches between a state in which driving force is transmitted between the first input member 11 and the first counter shaft 31a via a first gear pair GP1 consisting of a first gear G1 and a third gear G3, a state in which driving force is transmitted between the first input member 11 and the first counter shaft 31a via a second gear pair GP2 consisting of a second gear G2 and a fourth gear G4, and a state in which driving force is not transmitted between the first input member 11 and the first counter shaft 31a.

[0032] In the following, a state in which a driving force is transmitted between the first input member 11 and the first countershaft 31a via the first gear pair GP1 (i.e., a state in which the first input member 11 and the first countershaft 31a are connected via the first gear pair GP1) is referred to as a "first connected state". A state in which a driving force is transmitted between the first input member 11 and the first countershaft 31a via the second gear pair GP2 (i.e., a state in which the first input member 11 and the first countershaft 31a are connected via the second gear pair GP2) is referred to as a "second connected state". A state in which a driving force is not transmitted between the first input member 11 and the first countershaft 31a is referred to as a "disconnected state". The fifth gear G5 meshing with the differential input gear GD is connected to the first countershaft 31a so as to rotate integrally with the first countershaft 31a. Therefore, in the first connected state and the second connected state, a driving force is transmitted between the first input member 11 and the differential input gear GD (i.e., the third power transmission path is connected), and in the non-connected state, a driving force is not transmitted between the first input member 11 and the differential input gear GD (i.e., the third power transmission path is disconnected).

[0033] In this embodiment, the third gear G3 and the fourth gear G4 are connected to the first countershaft 31a so as to rotate integrally with the first countershaft 31a. The first switching mechanism 51 is configured to switch between a state in which only the first gear G1 of the first gear G1 and the second gear G2 is connected to the first input member 11, a state in which only the second gear G2 of the first gear G1 and the second gear G2 is connected to the first input member 11, and a state in which both the first gear G1 and the second gear G2 are disconnected from the first input member 11. That is, the first gear G1 and the second gear G2 are selectively connected to the first input member 11 by the first switching mechanism 51.

[0034] A first connected state is realized when only the first gear G1 of the first gear G1 and the second gear G2 is connected to the first input member 11. A second connected state is realized when only the second gear G2 of the first gear G1 and the second gear G2 is connected to the first input member 11. A non-connected state is realized when both the first gear G1 and the second gear G2 are disconnected from the first input member 11. In the first connected state, the second gear G2 is supported by the first input member 11 so as to be rotatable relative to the first input member 11, in the second connected state, the first gear G1 is supported by the first input member 11 so as to be rotatable relative to the first input member 11, and in the non-connected state, the first gear G1 and the second gear G2 are supported by the first input member 11 so as to be rotatable relative to the first input member 11.

[0035] The rotational speed ratio between the first input member 11 and the first countershaft 31a is determined according to the gear ratio between the first gear G1 and the third gear G3 in the first connected state, and is determined according to the gear ratio between the second gear G2 and the fourth gear G4 in the second connected state. The gear ratio between the first gear G1 and the third gear G3 is set to be different from the gear ratio between the second gear G2 and the fourth gear G4. Therefore, by switching between the first connected state and the second connected state using the first switching mechanism 51, the rotational speed ratio between the first input member 11 and the first countershaft 31a can be switched to a different value.

[0036] The ratio of the rotation speed of the first input member 11 to the rotation speed of the differential input gear GD is defined as the gear ratio. In this embodiment, the gear ratio between the first gear G1 and the third gear G3 and the gear ratio between the second gear G2 and the fourth gear G4 are set so that the gear ratio in the first connected state is larger than the gear ratio in the second connected state. Thus, a low gear is formed in the first connected state, and a high gear is formed in the second connected state. Since the gear ratio between the first gear G1 and the third gear G3 and the gear ratio between the second gear G2 and the fourth gear G4 are set in this way, in this embodiment, the first gear G1 is formed to have a smaller diameter than the second gear G2, and the third gear G3 is formed to have a larger diameter than the fourth gear G4.

[0037] In this embodiment, the first gear G1 is formed to have a smaller diameter than the third gear G3. That is, the gear ratio between the first gear G1 and the third gear G3 is set so that the rotation of the first input member 11 is decelerated and transmitted to the first countershaft 31a. In addition, in this embodiment, the second gear G2 is formed to have a larger diameter than the fourth gear G4. That is, the gear ratio between the second gear G2 and the fourth gear G4 is set so that the rotation of the first input member 11 is accelerated and transmitted to the first countershaft 31a.

[0038] In this embodiment, the first switching mechanism 51 is configured using a meshing type engagement device (dog clutch). Specifically, the first switching mechanism 51 includes a first sleeve member 51a movable in the axial direction L, a first engagement portion E1 that rotates integrally with the first input member 11, a second engagement portion E2 that rotates integrally with the first gear G1, and a third engagement portion E3 that rotates integrally with the second gear G2. The first sleeve member 51a, the first engagement portion E1, the second engagement portion E2, and the third engagement portion E3 are disposed on the first axis A1. That is, the first switching mechanism 51 (specifically, at least the first sleeve member 51a, the first engagement portion E1, the second engagement portion E2, and the third engagement portion E3) are disposed coaxially with the first input member 11.

[0039] The position of the first sleeve member 51a in the axial direction L is changed by a first shift fork 51b (see FIG. 2) supported by the case 9 so as to be movable in the axial direction L. The first shift fork 51b is engaged with the first sleeve member 51a (specifically, a groove portion formed on the outer peripheral surface of the first sleeve member 51a) so as to move in the axial direction L integrally with the first sleeve member 51a in a state allowing rotation of the first sleeve member 51a (rotation about the first axis A1). The first shift fork 51b is moved in the axial direction L by the driving force of an actuator such as an electric actuator or a hydraulic actuator.

[0040] In this embodiment, internal teeth are formed on the inner peripheral surface of the first sleeve member 51a, and external teeth are formed on the outer peripheral surfaces of the first engagement portion E1, the second engagement portion E2, and the third engagement portion E3. The first sleeve member 51a is connected to the first engagement portion E1 in a state in which it is arranged so as to be fitted onto the outside of the first engagement portion E1 and is connected to the first engagement portion E1 so as not to rotate relative to the first engagement portion E1 and to be movable in the axial direction L relative to the first engagement portion E1. The first engagement portion E1 (specifically, the external teeth formed on the first engagement portion E1) engages with the first sleeve member 51a (specifically, the internal teeth formed on the first sleeve member 51a) regardless of the position of the first sleeve member 51a in the axial direction L. On the other hand, the second engagement portion E2 (specifically, the external teeth formed on the second engagement portion E2) and the third engagement portion E3 (specifically, the external teeth formed on the third engagement portion E3) selectively engage with the first sleeve member 51a (specifically, the internal teeth formed on the first sleeve member 51a) depending on the axial position L of the first sleeve member 51a.

[0041] The first switching mechanism 51 is configured to switch among a first connected state, a second connected state, and a non-connected state according to the position of the first sleeve member 51a in the axial direction L. Specifically, the non-connected state is realized when the first sleeve member 51a moves to a position in the axial direction L where it engages with the first engagement portion E1 and does not engage with the second engagement portion E2 and the third engagement portion E3 (see FIGS. 1 and 2). The first connected state is realized when the first sleeve member 51a moves to a position in the axial direction L where it engages with the first engagement portion E1 and the second engagement portion E2 and does not engage with the third engagement portion E3 (a position on the first axial side L1 from the position of the first sleeve member 51a shown in FIGS. 1 and 2). In addition, a second connection state is realized when the first sleeve member 51a moves to a position in the axial direction L where it engages with the first engagement portion E1 and the third engagement portion E3 but does not engage with the second engagement portion E2 (a position on the second axial side L2 from the position of the first sleeve member 51a shown in Figures 1 and 2).

[0042] As shown in Fig. 2, in this embodiment, the first input member 11 is supported by the case 9 at two points in the axial direction L by a pair of first bearings B1. As described above, the second chamber 92 is formed by the main body case 97 and the transmission mechanism side cover case 96 that abuts against the main body case 97 from the second axial side L2. One of the pair of first bearings B1 is supported by a partition wall 95 formed on the main body case 97, and the other is supported by the transmission mechanism side cover case 96. The first input gear G10, the first gear G1, and the second gear G2 housed in the second chamber 92 are disposed between the pair of first bearings B1 in the axial direction L.

[0043] Similarly, the third input member 13 is supported by the case 9 at two locations in the axial direction L by a pair of second bearings B2. One of the pair of second bearings B2 is supported by a partition wall 95 formed in the main body case 97, and the other is supported by a transmission mechanism side cover case 96. The third input gear G9 housed in the second chamber 92 is disposed between the pair of first bearings B1 in the axial direction L.

[0044] In this embodiment, the first counter shaft 31a is supported by the case 9 at two locations in the axial direction L by a pair of third bearings B3. Like the first bearing B1 and the second bearing B2, one of the pair of third bearings B3 is supported by a partition wall 95 formed on the main body case 97, and the other is supported by the transmission mechanism side cover case 96. The third gear G3, the fourth gear G4, and the fifth gear G5 are disposed between the pair of third bearings B3.

[0045] As shown in FIG. 1, the second gear mechanism 22 includes a sixth gear G6 (second input gear) arranged coaxially with the second input member 12, and a second counter gear mechanism 32. The second counter gear mechanism 32 includes a second counter shaft 32a, a seventh gear G7 meshing with the sixth gear G6, and an eighth gear G8 rotating integrally with the second counter shaft 32a and meshing with the differential input gear GD. In this embodiment, the sixth gear G6 is formed to have a smaller diameter than the seventh gear G7. That is, the gear ratio between the sixth gear G6 and the seventh gear G7 is set so that the rotation of the second input member 12 is decelerated and transmitted to the second counter shaft 32a. In this embodiment, the eighth gear G8 is formed to have a smaller diameter than the differential input gear GD. That is, the gear ratio between the eighth gear G8 and the differential input gear GD is set so that the rotation of the second countershaft 32a is decelerated and transmitted to the differential gear device 6 (specifically, the differential input gear GD). In this embodiment, the seventh gear G7 is formed to have a larger diameter than the eighth gear G8.

[0046] The second gear mechanism 22 is provided with a second switching mechanism 52 that switches between a transmission state in which a driving force is transmitted between the second input member 12 and the second countershaft 32a via a gear pair of a sixth gear G6 and a seventh gear G7, and a non-transmission state in which a driving force is not transmitted between the second input member 12 and the second countershaft 32a. The eighth gear G8 that meshes with the differential input gear GD is connected to the second countershaft 32a so as to rotate integrally with the second countershaft 32a. Therefore, in the transmission state, a driving force is transmitted between the second input member 12 and the differential input gear GD (i.e., the second power transmission path is connected), and in the non-transmission state, a driving force is not transmitted between the second input member 12 and the differential input gear GD (i.e., the second power transmission path is disconnected).

[0047] In this embodiment, the sixth gear G6 is connected to the second input member 12 so as to rotate integrally with the second input member 12. The second switching mechanism 52 is configured to switch between a state in which the seventh gear G7 is connected to the second countershaft 32a and a state in which the seventh gear G7 is disconnected from the second countershaft 32a. That is, the seventh gear G7 is selectively connected to the second countershaft 32a by the second switching mechanism 52. When the seventh gear G7 is connected to the second countershaft 32a, a transmission state is realized. When the seventh gear G7 is disconnected from the second countershaft 32a, a non-transmission state is realized. In the non-transmission state, the seventh gear G7 is supported by the second countershaft 32a so as to be rotatable relative to the second countershaft 32a.

[0048] In this embodiment, the second switching mechanism 52 is configured using a meshing type engagement device (dog clutch). Specifically, the second switching mechanism 52 includes a second sleeve member 52a movable in the axial direction L, a fourth engagement portion E4 that rotates integrally with the second counter shaft 32a, and a fifth engagement portion E5 that rotates integrally with the seventh gear G7. The second sleeve member 52a, the fourth engagement portion E4, and the fifth engagement portion E5 are disposed on the sixth axis A6. That is, the second switching mechanism 52 (specifically, at least the second sleeve member 52a, the fourth engagement portion E4, and the fifth engagement portion E5) are disposed coaxially with the second counter gear mechanism 32. In this manner, the second switching mechanism 52 includes the second sleeve member 52a coaxially with the second counter gear mechanism 32. As described later, the second sleeve member 52a moves in the axial direction L to switch between a transmission state and a non-transmission state.

[0049] The position of the second sleeve member 52a in the axial direction L is changed by a second shift fork 52b (see FIGS. 2 and 3) supported by the case 9 so as to be movable in the axial direction L. The second shift fork 52b is engaged with the second sleeve member 52a (specifically, a groove formed on the outer circumferential surface of the second sleeve member 52a) so as to move in the axial direction L integrally with the second sleeve member 52a in a state allowing rotation of the second sleeve member 52a (rotation about the sixth axis A6). Although details will be described later, a drive mechanism that drives the second sleeve member 52a in the axial direction L is configured using the second shift fork 52b.

[0050] In this embodiment, internal teeth are formed on the inner peripheral surface of the second sleeve member 52a, and external teeth are formed on the outer peripheral surfaces of the fourth engagement portion E4 and the fifth engagement portion E5. The second sleeve member 52a is connected to the fourth engagement portion E4 in a state in which it is arranged so as to be fitted onto the fourth engagement portion E4, so as to be non-rotatable relative to the fourth engagement portion E4 and movable in the axial direction L relative to the fourth engagement portion E4. The fourth engagement portion E4 (specifically, the external teeth formed on the fourth engagement portion E4) engages with the second sleeve member 52a (specifically, the internal teeth formed on the second sleeve member 52a) regardless of the position in the axial direction L of the second sleeve member 52a. On the other hand, the fifth engagement portion E5 (specifically, the external teeth formed on the fifth engagement portion E5) selectively engages with the second sleeve member 52a (specifically, the internal teeth formed on the second sleeve member 52a) depending on the position in the axial direction L of the second sleeve member 52a.

[0051] The second switching mechanism 52 is configured to switch between a transmission state and a non-transmission state according to the position of the second sleeve member 52a in the axial direction L. Specifically, the non-transmission state is realized when the second sleeve member 52a moves to a position in the axial direction L where it engages with the fourth engagement portion E4 but does not engage with the fifth engagement portion E5 (see FIGS. 1 and 2). The transmission state is realized when the second sleeve member 52a moves to a position in the axial direction L where it engages with the fourth engagement portion E4 and the fifth engagement portion E5 (a position on the first axial side L1 from the position of the second sleeve member 52a shown in FIGS. 1 and 2).

[0052] 2, in this embodiment, the second input member 12 is supported by the case 9 at two locations in the axial direction L by a pair of fourth bearings B4. Like the first bearing B1, one of the pair of fourth bearings B4 is supported by a partition wall 95 formed in the main body case 97, and the other is supported by a transmission mechanism side cover case 96. The sixth gear G6 housed in the second chamber 92 is disposed between the pair of fourth bearings B4 in the axial direction L.

[0053] Incidentally, the first rotating electric machine 1, the second rotating electric machine 2, the power transmission mechanism 20, and the differential gear device 6 constituting the vehicle drive device 100 are lubricated (including cooled) by oil. The lubricating oil is supplied to the vehicle drive device 100 from at least one of a mechanical oil pump (not shown) driven by one or more of the internal combustion engine 3, the first rotating electric machine 1, and the second rotating electric machine 2, which are driving power sources for the wheels W, and an electric oil pump (not shown) driven by a driving power source other than the driving power source for the wheels W (for example, a rotating electric machine (motor) other than the first rotating electric machine 1 and the second rotating electric machine 2). In this embodiment, the oil pump that supplies cooling oil to the second rotating electric machine 2, i.e., the oil pump that operates independently of the wheels W, is an electric oil pump. In addition, the oil pump that operates independently of the wheels W may be, for example, a mechanical oil pump driven by at least one of the first rotating electric machine 1 and the internal combustion engine 3 that rotate when generating electricity while the wheels are stopped. In the vehicle drive device 100, oil passages are formed to each mechanical part, and oil is supplied from these oil pumps. However, forming oil passages to all mechanical parts may complicate the oil passages and may result in the vehicle drive device 100 becoming larger. Also, if there are many oil passages, it may become necessary to increase the discharge capacity of the oil pump.

[0054] Therefore, instead of forming an oil passage from the oil pump to directly supply oil from the oil pump, it is often the case that oil is supplied to some mechanisms of the vehicle drive device 100 and the oil used to lubricate the other mechanisms is used. For example, the vehicle drive device 100 may be configured to lubricate the other mechanisms by using rotating members such as various gears provided in the vehicle drive device 100 to scoop up the oil or to splash the oil by centrifugal force. For example, a differential input gear GD is mainly used as such a rotating member.

[0055] Here, when the rotating member rotates, the oil can be supplied to the lubrication target portion by the rotating member, but when the rotating member does not rotate, the oil cannot be supplied sufficiently. As described above, the vehicle drive device 100 can operate in at least two operation modes, a series mode and a parallel mode, depending on the state of the power transmission mechanism 20. In the series mode, for example, the internal combustion engine 3 is driven while the wheels are stopped, the first rotating electric machine 1 is operated in a regenerative manner to generate electricity, and the electricity storage device can be charged. At this time, the first gear mechanism 21 is controlled so that the driving force from the internal combustion engine 3 is not transmitted to the wheels W. In addition, the second gear mechanism 22 is also controlled so that the driving force of the second rotating electric machine 2 is not transmitted to the wheels W. That is, when generating electricity while the wheels are stopped, many rotating members constituting the power transmission mechanism 20 are not rotating, and there is a possibility that oil is not sufficiently supplied due to scooping up, etc.

[0056] For example, in the series mode, at least the first input member 11, the first rotating electric machine 1, the third input gear G9, and the first input gear G10 rotate during power generation while the wheels are stopped, and it is preferable that these and the bearings supporting these are appropriately lubricated. The vehicle drive device 100 according to this embodiment is configured so that these are appropriately lubricated even in such a case.

[0057] As described above, the case 9 includes the first chamber 91 that houses the first rotating electric machine 1 and the second rotating electric machine 2, the second chamber 92 that houses the power transmission mechanism 20, and the partition wall 95 that separates the first chamber 91 from the second chamber 92. FIG. 3 shows a schematic cross-sectional view of the first chamber 91 viewed from the side facing the partition wall 95 along the axial direction L, and FIG. 4 shows a schematic cross-sectional view of the second chamber 92 viewed from the side facing the partition wall 95 along the axial direction L. In the following description, when the vehicle drive device 100 is attached to the vehicle, the axial direction L is assumed to be along the horizontal direction, and the direction perpendicular to the horizontal direction is assumed to be the up-down direction V. In addition, the direction perpendicular to the axial direction L and the up-down direction V is assumed to be the width direction H, and one side in the width direction H is referred to as the first width direction side H1, and the other side is referred to as the second width direction side H2. The width direction H is a direction along the horizontal direction.

[0058] As will be described in detail later, the vehicle drive device 100 includes a first oil receiving portion 7 disposed below the second rotating electric machine 2 at a position V2 as shown in FIG. 3, and receiving oil dropping from the second rotating electric machine 2. The first oil receiving portion 7 is disposed in the first chamber 91. Specifically, the first oil receiving portion 7 is formed in the first chamber 91 by abutting a rib (first body side rib 75) protruding from a partition wall 95 in the main body case 97 toward the rotating electric machine side cover case and a rib (first cover side rib: not shown) protruding from a wall surface of the rotating electric machine side cover case toward the main body case 97. The first oil receiving portion 7 is formed in a bowl shape so as to store oil. In this embodiment, the "ribs" forming the first oil receiving portion 7, the second oil receiving portion 8, etc. include not only a protruding wall protruding from the inner surface of the case 9, but also a portion constituting the outer wall of the case 9. 3 and 4, the vehicle drive device 100 includes a first oil supply passage 70 that supplies oil collected in the first oil receiving portion 7 to a first bearing B1 that supports the first input member 11 and a first input gear G10 that rotates integrally with the first input member 11. The first oil supply passage 70 is provided so as to penetrate the partition wall 95 and communicate between the first chamber 91 and the second chamber 92. In this embodiment, the first oil supply passage 70 includes a first first oil passage 71 and a second first oil passage 77.

[0059] 4, the second chamber 92 is formed with a second oil receiving portion 8, an oil guide passage 88 for guiding the oil supplied from the first oil passage 71 (first oil supply passage 70) to the first input gear G10 and scooped up by the first input gear G10 to the second oil receiving portion 8, and a second oil passage 81 (second oil supply passage 80) for supplying the oil stored in the second oil receiving portion 8 to the second bearing B2 supporting the third input member 13 which is the rotating shaft of the first rotating electric machine 1. The second oil receiving portion 8 is formed in the second chamber 92 by abutting a rib (second body side rib 85a) protruding from the partition wall 95 in the body case 97 toward the transmission mechanism side cover case 96 side and a rib protruding from the wall surface of the transmission mechanism side cover case 96 toward the body case 97 side. The second oil receiving portion 8 is formed in a bowl shape so as to be able to store oil. The bottom 89 of the second oil receiving portion 8 is disposed at a position V2 below the upper end of the first input gear G10.

[0060] For example, oil supplied from an electric oil pump is supplied from an upper V1 of the second rotating electric machine 2 toward the second rotating electric machine 2 in order to cool the second rotating electric machine 2. More specifically, the oil is supplied toward a stator coil wound around the second stator 2s of the second rotating electric machine 2. The oil that has cooled the second rotating electric machine 2 flows downward V2 according to gravity. As shown in FIG. 3, the oil that has dropped from the second rotating electric machine 2 is received by the first oil receiving portion 7 disposed below V2 of the second rotor 2r, and is stored in the first oil receiving portion 7. The first oil receiving portion 7 is provided with a first oil supply passage 70 (a first first oil passage 71 and a second first oil passage 77) that penetrates the partition wall 95 to communicate the first chamber 91 and the second chamber 92 and supplies the oil stored in the first oil receiving portion 7 to the second chamber 92. In this embodiment, when the first rotating electric machine 1 is generating electricity while the wheels W are stopped, the second rotating electric machine 2 is not driven, but due to the configuration of the oil passage, cooling oil is supplied to both the first rotating electric machine 1 and the second rotating electric machine 2.

[0061] The oil supplied to the second chamber 92 through the first first oil passage 71 lubricates the first input gear G10. The oil that has passed through the second first oil passage 77 lubricates the first bearing B1 of the first input member 11. Then, for example, as shown in FIG. 2, the oil that has passed through the first oil supply passage 70 lubricates the first bearing B1 on the left side of the figure, and is then supplied to the shaft space 11e of the first input member 11. This oil not only provides shaft lubrication, but is also used to lubricate other parts through oil passages provided radially from the shaft space 11e.

[0062] The oil supplied to the second chamber 92 through the first first oil passage 71 lubricates the first input gear G10. As shown in FIG. 4, the oil supplied through the first first oil passage 71 is scooped up by the rotation of the first input gear G10. The oil is carried by centrifugal force to the radially outer side of a guide rib 86 formed along the outer periphery of the first input gear G10, and flows through the radially outer side of the guide rib 86 to the second oil receiving portion 8. That is, an oil guide passage 88 is formed on the radially outer side of the guide rib 86 to guide the oil supplied from the first first oil passage 71 to the first input gear G10 and scooped up by the first input gear G10 to the second oil receiving portion 8.

[0063] As shown in FIG. 4, the second oil receiving portion 8 is connected to a second oil passage 81 that supplies oil stored in the second oil receiving portion 8 to a second bearing B2 (see FIG. 2) that supports the third input member 13, which is the rotating shaft of the first rotating electric machine 1. As described above, the second oil receiving portion 8 is formed in the second chamber 92 by abutting the second body side rib 85a protruding from the partition wall 95 in the body case 97 toward the transmission mechanism side cover case 96 and the second cover side rib (not shown) protruding from the wall surface of the transmission mechanism side cover case 96 toward the body case 97. For example, the second oil passage 81 can be formed in each of the second body side rib 85a and the second cover side rib. As shown in FIG. 4, the body side second oil passage 81a can be formed in the second body side rib 85a, and the cover side second oil passage can be formed in the second cover side rib. As shown in FIG. 4, the second oil receiving portion 8 is positioned V1 above the third axis A3 on which the first rotating electric machine 1 is disposed, and can appropriately supply oil to the second bearing B2 of the first rotating electric machine 1.

[0064] As described above, the pair of second bearings B2 are supported by the partition wall 95 and the transmission mechanism side cover case 96. The second oil passages 81 are formed on the partition wall 95 side and the transmission mechanism side cover case 96 side, respectively, so that each of the pair of second bearings B2 can be appropriately lubricated.

[0065] However, when the oil level of the first oil receiving portion 7 is tilted due to a change in the vehicle's posture, acceleration, etc., the second rotor 2r may interfere with the oil stored in the first oil receiving portion 7. If the oil is agitated due to this interference, various effects may occur, such as a rotational resistance of the second rotor 2r causing a decrease in the efficiency of the second rotating electric machine 2, a decrease in the heat exchange amount due to oil foaming, and a decrease in the discharge pressure and flow rate of the oil pump due to air bubbles generated in the oil. The vehicle drive device 100 of this embodiment is configured to store the oil after cooling the second rotating electric machine 2 while minimizing interference between the oil and the second rotor 2r when the oil level of the stored oil is tilted due to a change in the vehicle's posture, acceleration, etc., and to appropriately supply the oil to lubrication target locations other than the second rotating electric machine 2 (the first bearing B1 and the first input gear G10).

[0066] As described above, the vehicle drive device 100 of this embodiment includes an input member (first input member 11) drivingly connected to the internal combustion engine 3 and arranged on the first shaft A1, an output member 5 drivingly connected to the wheels W, a rotating electric machine (second rotating electric machine 2) arranged on the second shaft A2 parallel to the first shaft A1 and separate from the first shaft A1 and including a rotor (second rotor 2r), and a power transmission mechanism 20 that transmits power between the first input member 11, the output member 5, and the second rotating electric machine 2. The second shaft A2 is also arranged above the first shaft A1 at V1. The vehicle drive device 100 also includes an oil receiving portion (first oil receiving portion 7) arranged below the second rotating electric machine 2 V2 so as to receive cooling oil that is supplied to the second rotating electric machine 2 and drops from the second rotating electric machine 2, and a first oil supply passage 70 that supplies the oil stored in the first oil receiving portion 7 to at least one of the first bearing B1 that supports the first input member 11 and the input gear (first input gear G10) that rotates integrally with the first input member 11. An inlet 79 that communicates with the first oil supply passage 70 and an outlet 4 that discharges the oil from the first oil receiving portion 7 are formed facing the first oil receiving portion 7. The oil stored in the first oil receiving portion 7 is supplied from the inlet 79 through the first oil supply passage 70 to at least one of the first bearing B1 and the first input gear G10. Excess oil (oil that interferes with the second rotor 2r) is discharged from the outlet 4, as described below. By being equipped with this outlet 4, the vehicle driving device 100 of this embodiment can minimize interference with the second rotor 2r when the oil level of the oil stored in the first oil receiving portion 7 tilts due to a change in vehicle posture, acceleration, etc.

[0067] The inlet 79 and the outlet 4 refer to the portions facing the first oil receiving portion 7, and may be hole-shaped or groove-shaped. The inlet 79 and the outlet 4 may be openings at the end of the wall of the case 9 or the like. Here, "facing the first oil receiving portion 7" means "facing the side where the first oil receiving portion 7 is located." For example, when no oil is stored in the first oil receiving portion 7, the inlet 79 is not immersed in the oil. Also, the outlet 4 is immersed in the oil only when it is necessary to discharge the oil. Therefore, "facing the first oil receiving portion 7" does not necessarily mean facing the "oil" in the first oil receiving portion 7 when the oil is stored therein. Naturally, the inlet 79 may face the "oil" in the first oil receiving portion 7 when the oil is sufficiently accumulated, and the outlet 4 will face the "oil" accumulated in the first oil receiving portion 7 when the area in which the oil stored in the first oil receiving portion 7 is located changes due to a change in the vehicle's posture or the like. Therefore, "facing the first oil receiving portion 7" can include all of the above concepts.

[0068] The arrangement of the inlet 79 and the outlet 4 will be described below with reference to Figs. 5 to 10. As shown in Fig. 5, the oil level P when the vehicle is stopped on a horizontal surface and the first oil receiving section 7 is filled with oil is defined as the reference oil level P0. The state in which the vehicle is positioned on the horizontal surface is the reference posture. The oil level P when the vehicle is stopped on a horizontal surface, the electric oil pump is operating, and the oil level in the first oil receiving section 7 is stable (in other words, the oil circulation state is in a steady state) may be defined as the reference oil level P0. The reference oil level P0 is set to be located below the second rotor 2r (below V2).

[0069] 3 and 5, the inlet 79 is provided so that at least a part of it, preferably the entirety, is located below the reference oil level P0. In this embodiment, the inlet 79 is provided so that the entirety is located below the reference oil level P0. In this embodiment, it can be said that the reference oil level P0 is set below the second rotor 2r and above the inlet 79 (upper V1) in the first oil receiving portion 7. The discharge port 4 is provided above this reference oil level P0.

[0070] FIG. 6 shows a schematic diagram of the relationship between the oil level (first oil level P1) and the second rotor 2r, the outlet 4, and the inlet 79 when the vehicle is tilted to one side in the front-rear direction (width direction H). In this embodiment, the first widthwise side H1 corresponds to the front of the vehicle, and the second widthwise side H2 corresponds to the rear of the vehicle. The example shown in FIG. 6 assumes, for example, a case where the vehicle is climbing a slope (climbing a slope). Also, when only the oil level P is focused on, for example, when the vehicle is accelerated forward during acceleration (when negative acceleration occurs in the oil due to inertia), the oil level P also has a similar inclination. Note that changes in the vehicle's posture also include those caused by bending of the wheels W (tires) and expansion and contraction of the suspension.

[0071] Here, the first oil level P1 is the oil level P at which the oil comes into contact with the second rotor 2r due to the oil level P tilting due to a change in the vehicle's posture and acceleration / deceleration, and is the restricted oil level Q. As will be described later, the oil level P may also tilt when the vehicle tilts in the left / right direction, and in this case, the restricted oil level Q is similarly set. When distinguishing between these restricted oil levels Q, the restricted oil level Q when the vehicle tilts in the front / rear direction is referred to as the first target oil level Q1.

[0072] As shown in Figs. 5 and 6, the outlet 4 is provided so as to have a portion located below the oil level Q to be restricted. In this case, "below" refers to the downward direction in the vertical direction regardless of the posture of the vehicle. In this embodiment, as shown in Fig. 5, even when the oil level Q to be restricted is virtually set in the reference posture, the outlet 4 is provided so as to have a portion located above the reference oil level P0 and below the oil level Q to be restricted. In other words, as shown in Fig. 3, the outlet 4 has a portion that passes through at least the upper tip t7 of the first oil receiving portion 7 and is below the imaginary plane VP that contacts the lower end t2 of the second rotor 2r over the entire axial direction L of the second rotor 2r. That is, when the vehicle is inclined only in the front-rear direction and oil is stored in the first oil receiving portion 7 without overflowing from the tip t7 of the first oil receiving portion 7, the outlet 4 is provided at a position where oil can be discharged from the first oil receiving portion 7 so that the second rotor 2r is not immersed in oil.

[0073] 7 is a schematic diagram showing the relationship between the oil level (second oil level P2) and the second rotor 2r, the outlet 4, and the inlet 79 when the vehicle is tilted to the other side in the front-rear direction (width direction H). As described above, in this embodiment, the first widthwise side H1 corresponds to the front of the vehicle, and the second widthwise side H2 corresponds to the rear of the vehicle, and the example shown in FIG. 7 assumes, for example, a case where the vehicle is going down a slope (downhill). Also, when only the oil level P is considered, for example, when a negative acceleration in the forward direction occurs in the vehicle during deceleration of the vehicle (when a positive acceleration occurs in the oil due to inertia force), the oil level P also has a similar inclination.

[0074] Here, the second oil level P2 is the oil level P in a state where the oil level P is tilted due to a change in the vehicle's posture and acceleration / deceleration, but unlike the first oil level P1, the oil does not come into contact with the second rotor 2r at the second oil level P2. Therefore, the second oil level P2 is not the oil level Q to be restricted. As shown in FIG. 7, when the oil level P in the first oil receiving portion 7 is the second oil level P2, oil overflows from the first oil receiving portion 7, and the amount of oil stored in the first oil receiving portion 7 is reduced. In this embodiment, as shown in FIG. 7, the inlet 79 is provided so as to be located below the oil level P (the second oil level P2) even if the oil level P is tilted. Therefore, even in this case, oil can be appropriately supplied to the first bearing B1 and the first input gear G10 through the first oil supply passage 70.

[0075] That is, in the case where the amount of oil stored in the first oil receiving portion 7 decreases due to tilt caused by a change in the vehicle's posture and acceleration / deceleration, it is preferable that the inlet 79 is provided below a predetermined oil level P (lower limit oil level, for example, the second oil level P2). It is preferable that this lower limit oil level is set according to the forward / rearward tilt angle allowed for the vehicle, negative acceleration, etc.

[0076] 6, in this embodiment, the inlet 79 is provided so as to be located below an oil level P (upper limit oil level P9) that is parallel to the restricted oil level Q and passes through the lower end of the outlet 4. When oil stored in the first oil receiving portion 7 is discharged from the outlet 4, the oil level P drops to the upper limit oil level P9. By positioning the inlet 79 below the upper limit oil level P9, it is possible to sufficiently supply oil for lubrication from the inlet 79 while suppressing interference between the oil stored in the first oil receiving portion 7 and the second rotor 2r.

[0077] In other words, according to this embodiment, even if the oil level tilts due to a change in vehicle posture and acceleration / deceleration, and oil is discharged from the outlet 4, the oil inlet 79 is located below the oil level at that time, so that lubricating oil can be appropriately supplied to at least one of the first bearing B1 and the input gear (first input gear G10) via the oil supply passage (first oil supply passage 70).

[0078] When the vehicle is in the reference posture, if the inlet 79 is provided so as to be located below the reference oil level P0, lubricating oil can be supplied from the inlet 79. As shown in Fig. 5, when the vehicle is in the reference posture, the area below the reference oil level P0 may include an area above the upper limit oil level P9. Therefore, this does not preclude a configuration in which the inlet 79 is provided below the reference oil level P0 and above the upper limit oil level P9.

[0079] In the above, we have described the case where the vehicle tilts in the longitudinal direction, but when turning, the vehicle may tilt left or right depending on the road shape and acceleration (including bending of the wheels W (tires) and expansion and contraction of the suspension). Even when the vehicle tilts left or right, there is a possibility that the oil stored in the first oil receiving portion 7 may interfere with the second rotor 2r. FIG. 8 shows a schematic diagram of the relationship between the oil level P (reference oil level P0) when the vehicle is positioned on a horizontal plane (in the case of the reference posture) and the second rotor 2r, the outlet 4, and the inlet 79 when viewed in the direction perpendicular to the axis.

[0080] 3 and 5 to 7, which are schematic views of the wall surface of the main body case 97 on the side of the first chamber 91 as viewed in the axial direction, only the first exhaust port 41 provided on the second axial side L2 is illustrated, and in the above description, this has been described as the exhaust port 4. In Figs. 8 to 10, which are viewed in the direction perpendicular to the axis, in addition to the first exhaust port 41 illustrated with reference to Figs. 3 and 5 to 7, a configuration is illustrated in which a second exhaust port 42 provided on the first axial side L1 relative to the first exhaust port 41 is also provided. Note that Figs. 8 to 10 are schematic views, and the opening shapes of the exhaust port 4 and the inlet 79 are the same as those in Figs. 5 to 7 regardless of the viewing angle in order to facilitate understanding.

[0081] FIG. 9 shows a schematic diagram of the relationship between the oil level P and the second rotor 2r, the outlet 4, and the inlet 79 when the vehicle is tilted to one side in the left-right direction (axial direction L). The example shown in FIG. 9 assumes a case where the vehicle is tilted to the left-right direction so that the second axial side L2 is lower and the first axial side L1 is upper. In addition, when only the oil level P is considered, for example, when acceleration (centrifugal force) toward the first axial side L1 occurs in the vehicle when the vehicle turns, and a force toward the second axial side L2 acts on the oil due to inertia force, causing the oil to be left behind, the oil level P will be tilted in the same way as in FIG. 9. Although not shown, when acceleration (centrifugal force) toward the second axial side L2 continues to act on the vehicle when the vehicle turns, and acceleration toward the second axial side L2 also acts on the oil, the inclination of the oil level P relative to the second rotor 2r will be the same as in FIG. 9.

[0082] FIG. 10 shows a schematic diagram of the relationship between the oil level P and the second rotor 2r, the outlet 4, and the inlet 79 when the vehicle is tilted to the other side in the left-right direction (axial direction L). The example shown in FIG. 10 assumes a case where the vehicle is tilted to the left-right direction so that the first axial side L1 is lower and the second axial side L2 is upper. In addition, when only the oil level P is considered, for example, when acceleration (centrifugal force) toward the second axial side L2 occurs in the vehicle when the vehicle turns, and a force toward the first axial side L1 acts on the oil due to inertia force, causing the oil to be left behind, the oil level P will be tilted in the same way as in FIG. 10. Although not shown, when acceleration (centrifugal force) toward the first axial side L1 continues to act on the vehicle when the vehicle turns, and similarly, acceleration toward the first axial side L1 also acts on the oil, the inclination of the oil level P relative to the second rotor 2r will be the same as in FIG. 10.

[0083] The third oil level P3 in Fig. 9 and the fourth oil level P4 in Fig. 10 are both oil levels P that have come into contact with the second rotor 2r due to tilting caused by changes in the vehicle's posture and acceleration / deceleration, and correspond to the restricted oil level Q. When distinguishing these restricted oil levels Q from the restricted oil level Q (first target oil level Q1) when the vehicle comes into contact with the second rotor 2r due to tilting in the longitudinal direction, they are referred to as the second target oil level Q2. When distinguishing between the third oil level P3 and the fourth oil level P4 as the second target oil level Q2, the third oil level P3 is referred to as the first second target oil level Q21, and the fourth oil level P4 is referred to as the second second target oil level Q22.

[0084] 8, the inlet 79 is provided so that at least a part of it, preferably the entirety, is located below the reference oil level P0 even when viewed in the direction perpendicular to the axis. In this embodiment, the inlet 79 is provided so that the entirety is located below the reference oil level P0. In this embodiment, it can be said that the reference oil level P0 is set below the second rotor 2r and above the inlet 79 in the first oil receiving portion 7. The discharge port 4 is provided above this reference oil level P0.

[0085] 9 and 10, the outlet 4 is provided to have a portion located below the restricted oil level Q (second target oil level Q2). In the present embodiment, the outlet 4 has a first outlet 41 relatively located on the second axial side L2 and a second outlet 42 relatively located on the first axial side L1 when viewed in the axial direction.

[0086] When the vehicle is tilted in the left-right direction so that the second axial side L2 is lowered, the outlet 4 is provided so that the entire first outlet 41 provided on the second axial side L2 is located below the second target oil level Q2, and at least a part of the second outlet 42 provided on the first axial side L1 is located below the second target oil level Q2, as shown in Fig. 9. When the vehicle is tilted in the left-right direction so that the first axial side L1 is lowered, the outlet 4 is provided so that the entire second outlet 42 provided on the first axial side L1 is located below the second target oil level Q2, and at least a part of the first outlet 41 provided on the second axial side L2 is located below the second target oil level Q2, as shown in Fig. 10. In other words, by providing a first drain outlet 41 and a second drain outlet 42 on opposite sides of the second rotor 2r in the axial direction L, oil is discharged from at least one of the drain outlets 4 even if the vehicle is tilted to the left or right, and the second rotor 2r and the oil in the first oil receiving portion 7 are less likely to interfere with each other.

[0087] As described above with reference to Fig. 6 etc. for the example in which the vehicle is tilted in the longitudinal direction, in this embodiment, even when the vehicle is tilted in the lateral direction, the inlet 79 is provided so as to be located below the oil level P (upper limit oil level P9) that is parallel to the restricted oil level Q and passes through the lower end of the outlet 4. When oil stored in the first oil receiving portion 7 is discharged from the outlet 4, the oil level P drops to the upper limit oil level P9. By positioning the inlet 79 below the upper limit oil level P9, it is possible to sufficiently supply oil for lubrication from the inlet 79 while suppressing interference between the stored oil and the second rotor 2r.

[0088] As described above, in this embodiment, the restricted oil level Q includes a first target oil level Q1, which is the oil level P that comes into contact with the second rotor 2r as the vehicle tilts in the longitudinal direction, and a second target oil level Q2, which is the oil level P that comes into contact with the second rotor 2r as the vehicle tilts in the lateral direction. The outlet 4 is provided to have a portion that is located below both the first target oil level Q1 and the second target oil level Q2.

[0089] With this configuration, oil is discharged from the outlet 4 in both cases where the oil level P is tilted in the longitudinal direction of the vehicle and in the lateral direction of the vehicle due to changes in the vehicle's posture and acceleration / deceleration, so that the oil level P in the oil receiving section (first oil receiving section 7) can be easily maintained below the lower end of the rotor (second rotor 2r). The oil inlet 79 is located below the first target oil level Q1 and the second target oil level Q2, which are the oil levels P in these cases. Therefore, the oil for lubrication can be appropriately supplied to at least one of the first bearing B1 and the input gear (first input gear G10) via the oil supply passage (first oil supply passage 70). In addition, the structure for providing the outlet 4 and the inlet 79 can be easily simplified regardless of the direction in which the oil level P is tilted.

[0090] In this embodiment, the outlet 4 includes a first outlet 41 and a second outlet 42. The first outlet 41 is provided to have a portion located below the first target oil level Q1, as shown in Figures 5 and 6. The second outlet 42 is provided to have a portion located below the second target oil level Q2 (both the first second target oil level Q21 and the second second target oil level Q22).

[0091] With this configuration, oil is discharged from the first discharge port 41 or the second discharge port 42 in both cases where the oil level P is tilted in the longitudinal direction of the vehicle and in the lateral direction of the vehicle due to changes in the vehicle's posture and acceleration / deceleration, and therefore the oil level P in the oil receiving portion (first oil receiving portion 7) is easily maintained below the lower end of the rotor (second rotor 2r). The oil inlet 79 is located below the first target oil level Q1 and the second target oil level Q2, which are the oil level P in these cases. Therefore, the oil for lubrication can be appropriately supplied to at least one of the first bearing B1 and the input gear (first input gear G10) via the oil supply passage (first oil supply passage 70). In addition, by arranging the first discharge port 41 and the second discharge port 42 according to the direction in which the oil level is tilted, the discharge port 4 can be easily provided at an appropriate position, and the structure in which the discharge port 4 and the inlet 79 are provided can be prevented from becoming complicated.

[0092] The discharge outlets 4 may be provided separately as discharge outlets 4 corresponding only to inclination in the front-rear direction and discharge outlets 4 corresponding only to inclination in the left-right direction, or a single discharge outlet 4 may be provided corresponding to inclination in both the front-rear direction and the left-right direction. In addition, when the discharge outlets 4 are provided at multiple locations, both discharge outlets 4 corresponding to inclination in only one of the front-rear direction and the left-right direction and discharge outlets 4 corresponding to both directions may be included. Of course, when the discharge outlets 4 are provided at multiple locations, all of the discharge outlets 4 may be discharge outlets 4 corresponding to inclination in both the front-rear direction and the left-right direction.

[0093] In addition, in the case where the first outlet 41 acts to limit the oil discharge when the vehicle tilts in the longitudinal direction, and the second outlet 42 acts to limit the oil discharge when the vehicle tilts in the lateral direction, the first outlet 41 and the second outlet 42 may be provided as follows. For example, the first outlet 41 may be provided to have a portion located below the first target oil level Q1, and to be located above the second target oil level Q2. In addition, the second outlet 42 may be provided to have a portion located below the second target oil level Q2, and to be located above the first target oil level Q1.

[0094] Also, in this embodiment, an embodiment is exemplified in which interference between the second rotor 2r and the oil in the first oil receiving portion 7 can be suppressed both when the vehicle tilts in the front-rear direction and when it tilts in the left-right direction. However, taking into consideration the frequency of occurrence of the cases in which the vehicle tilts in the front-rear direction and the left-right direction, and the impact when they occur, the embodiment may be configured to suppress interference between the second rotor 2r and the oil in the first oil receiving portion 7 only when the vehicle tilts in the front-rear direction or only when it tilts in the left-right direction.

[0095] As described above, the vehicle drive device 100 of this embodiment includes the first rotating electric machine 1 and the second rotating electric machine 2. The power transmission mechanism 20 can execute two operation modes by changing the power transmission state between the first input member 11 and the output member 5 and between the first rotating electric machine 1 and the second rotating electric machine 2. The operation mode is a series mode in which a driving force is transmitted between the first input member 11 and the first rotating electric machine 1 and between the second rotating electric machine 2 and the output member 5, and the parallel mode in which a driving force is transmitted between the input member (first input member), the second rotating electric machine 2, and the output member 5.

[0096] In the series mode, the first rotating electric machine 1 generates electricity by the driving force of the internal combustion engine 3, and the wheels W are driven by the second rotating electric machine 2. For example, while the vehicle is stopped in the series mode, the input member (first input member 11) supported by the first bearing B1 may rotate by the driving force of the internal combustion engine 3, while the output member 5 may not rotate. According to the present embodiment, even in such a case where the output member 5 is not rotating and oil cannot be supplied by scooping, oil can be supplied to at least one of the first bearing B1 and the input gear (first input gear G10). In other words, even when the vehicle is stopped in the series mode, at least one of the first bearing B1 supporting the input member (first input member 11) that rotates for generating electricity and the input gear (first input gear G10) that rotates integrally with the input member (first input member 11) can be appropriately lubricated.

[0097] Other embodiments Other embodiments will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, and may be applied in combination with the configurations of other embodiments as long as no contradiction occurs.

[0098] (1) FIG. 11 shows another example of the configuration of the oil receiving portion. Hereinafter, common parts will be described with the same reference numerals as those in the above-mentioned embodiment with reference to FIG. 1 to FIG. 4. As shown in FIG. 11, the first chamber 91 may be provided with a third oil receiving portion 73 in addition to the first oil receiving portion 7 (the second first oil receiving portion 7B). For example, a branch oil passage 72 is formed in the rib (the second first main body side rib 75B) forming the first oil receiving portion 7 so as to be adjacent to the first first oil passage 71 at the same position as the first first oil passage 71 in the vertical direction V. Since the first first oil passage 71 and the branch oil passage 72 are formed at the same position in the vertical direction V, the oil accumulated in the first oil receiving portion 7 flows through both oil passages at approximately the same rate. The branch oil passage 72 may be formed in the first cover side rib that abuts against the first main body side rib 75, or may be formed in both the first main body side rib 75 and the first cover side rib. The third oil receiving portion 73 is formed below the first oil receiving portion 7 at a position V2 so as to receive oil from the branched oil passage 72.

[0099] The third oil receiving portion 73 is also formed by abutment between a rib (third body side rib 76) formed on the main body case 97 and a rib (third cover side rib (not shown)) formed on the cover case of the rotating electric machine, similar to the first oil receiving portion 7. The third oil receiving portion 73 is provided with a third oil passage 74 penetrating the partition wall 95 and communicating the first chamber 91 with the second chamber 92. The oil passing through the third oil passage 74 lubricates the first bearing B1 of the first input member 11. Since the oil stored in the third oil receiving portion 73 is supplied from the first oil receiving portion 7, the third oil passage 74 supplies the oil stored in the first oil receiving portion 7 to the first bearing B1 supporting the input member. In other words, the third oil passage 74 constitutes the first oil supply passage 70 together with the first first oil passage 71. 2, the oil that has passed through the third oil passage 74 lubricates the first bearing B1 on the left side of the drawing, and is then supplied to the in-shaft space 11e of the first input member 11. This oil not only provides in-shaft lubrication, but is also used to lubricate other parts via oil passages provided radially from the in-shaft space 11e.

[0100] (2) The form of the vehicle drive device 100 is not limited to the above-mentioned form in which two rotating electric machines including the second rotating electric machine 2 (first rotating electric machine 1, second rotating electric machine 2) are provided, and the internal combustion engine 3, one rotating electric machine (first rotating electric machine 1), the other rotating electric machine (second rotating electric machine 2), and the wheels W are arranged in the described order in the power transmission path from the internal combustion engine 3 to the wheels W (so-called two-motor series-parallel hybrid). Other configurations are also possible as long as the shaft (first shaft A1) on which the internal combustion engine 3 is arranged is located lower in the up-down direction V than the shaft (second shaft A2) on which the rotor (second rotor 2r) whose interference with the oil receiving portion (first oil receiving portion 7) is suppressed is arranged.

[0101] For example, the vehicle drive system 100 may be in the form of a so-called one-motor parallel hybrid in which an internal combustion engine, one rotating electric machine, and wheels are arranged in the described order in a power transmission path from the internal combustion engine to the wheels. In addition, when the vehicle drive system 100 is a one-motor parallel hybrid, a rotating electric machine may be arranged in parallel to the power transmission path in which the internal combustion engine and the wheels are arranged in the described order, and the rotating electric machine may be capable of transmitting torque to the power transmission path. In addition, the vehicle drive system 100 may be a two-motor split hybrid equipped with a power split mechanism.

[0102] (3) In the above, the second shaft A2 is disposed above the first shaft A1, and the first oil supply passage 70 supplies the oil accumulated in the first oil receiving portion 7 from the inlet 79 to at least one of the first bearing B1 supporting the first input member 11 and the first input gear G10 rotating integrally with the first input member 11. However, the arrangement of the first shaft A1 and the second shaft A2 is not limited to this configuration, and the destination of the oil supplied via the first oil supply passage 70 does not have to include the first bearing B1 and the first input gear G10. The first oil supply passage 70 can be configured to supply oil to any part to be lubricated. That is, the first oil supply passage 70 may be configured to supply the oil accumulated in the first oil receiving portion 7 from the inlet 79 formed facing the first oil receiving portion 7 to the part to be lubricated.

[0103] [Summary of this embodiment] The above-described vehicle drive device (100) will be briefly summarized below.

[0104] In one embodiment, the vehicle drive device (100) includes an input member (11) drivingly connected to an internal combustion engine (3) and arranged on a first shaft (A1), an output member (5) drivingly connected to wheels (W), a rotating electric machine (2) arranged on a second shaft (A2) that is separate from the first shaft (A1) and parallel to the first shaft (A1) and includes a rotor (2r), and a power transmission mechanism (20) that transmits power between the input member (11), the output member (5), and the rotating electric machine (2). The vehicle drive device (100) includes an oil receiver (11) arranged below the rotating electric machine (2) so as to receive cooling oil that is supplied to the rotating electric machine (2) and drops from the rotating electric machine (2). The oil receiving portion (7) includes an oil receiving section (7), an oil supply passage (70) that supplies oil accumulated in the oil receiving portion (7) from an inlet (79) formed facing the oil receiving portion (7) to a location to be lubricated, and a discharge outlet (4) formed facing the oil receiving portion (7) that discharges the oil in the oil receiving portion (7), wherein the discharge outlet (4) has a portion that is located in the oil receiving portion (7) above a reference oil level (P0) that is set below the rotor (2r) and above the inlet (79) and below a restricted oil level (Q), which is an oil level that has come into contact with the rotor (2r) due to tilting caused by a change in vehicle posture and acceleration / deceleration.

[0105] According to this configuration, the oil that has been supplied for cooling the rotating electric machine (2) can be used to lubricate the parts to be lubricated. Therefore, it is not necessary to provide a separate oil supply source, such as an oil pump, for lubrication of the parts to be lubricated. Furthermore, according to this configuration, even if the oil level (P) in the oil receiving portion (7) is tilted due to a change in the vehicle's attitude or acceleration / deceleration caused by going uphill, going downhill, turning, etc., the oil level (P) can be easily maintained below the lower end (t2) of the rotor. Therefore, it is easy to avoid an increase in the rotational resistance of the rotor (2r) caused by the oil in the oil receiving portion (7) being stirred by the rotor (2r) and a decrease in the amount of heat exchange caused by foaming of the oil. In this way, with this configuration, it is possible to realize a vehicle drive device (100) that can store oil after cooling the rotating electric machine (2) and appropriately supply oil to points to be lubricated other than the rotating electric machine (2), while minimizing interference with the rotor (2r) when the oil level (P) of the stored oil tilts due to a change in vehicle posture, acceleration, etc.

[0106] Here, it is preferable that the inlet (79) is provided so as to be located below an oil level (P9) that is parallel to the oil level to be restricted (Q) and passes through the lower end of the outlet (4).

[0107] When the oil stored in the oil receiving portion (7) is discharged from the discharge port (4), the oil level (P) drops to an oil level (P9) that is parallel to the restricted oil level (Q) and passes through the lower end of the discharge port (4). By positioning the inlet (79) below the oil level (P9), it is possible to sufficiently supply oil for lubrication from the inlet (79) while suppressing interference between the stored oil and the rotor (2r).

[0108] In addition, the restricted oil level (Q) includes a first target oil level (Q1), which is an oil level (P) that comes into contact with the rotor (2r) when the vehicle tilts in the fore-aft direction, and a second target oil level (Q2), which is an oil level that comes into contact with the rotor (2r) when the vehicle tilts in the left-right direction, and it is preferable that the discharge outlet (4) is arranged to have a portion that is located below both the first target oil level (Q1) and the second target oil level (Q2).

[0109] With this configuration, oil is discharged from the outlet (4) in both cases where the oil level (P) tilts in the longitudinal direction of the vehicle and in the lateral direction of the vehicle due to changes in the vehicle's posture and acceleration / deceleration, and therefore the oil level (P) in the oil receiving portion (7) can be easily maintained below the lower end (2t) of the rotor (2r). Since the oil inlet (79) is located below the first target oil level (Q1) and the second target oil level (Q2), the oil for lubrication can be appropriately supplied to the parts to be lubricated via the oil supply passage (70). Moreover, regardless of the direction in which the oil level (P) tilts, the structure for providing the outlet (4) and the inlet (79) can be easily simplified.

[0110] In addition, the restricted oil level (Q) includes a first target oil level (Q1), which is an oil level (P) that comes into contact with the rotor (2r) as a result of the vehicle tilting in the fore-aft direction, and a second target oil level (Q2), which is an oil level that comes into contact with the rotor (2r) as a result of the vehicle tilting in the left-right direction, and it is preferable that the outlet (4) includes a first outlet (41) and a second outlet (42), and that the first outlet (41) is arranged to have a portion located below the first target oil level (Q1) and that the second outlet (42) is arranged to have a portion located below the second target oil level (Q2 (Q21, Q22)).

[0111] With this configuration, oil is discharged from the first discharge port (41) or the second discharge port (42) in both cases where the oil level (P) tilts in the longitudinal direction of the vehicle and in the lateral direction of the vehicle due to changes in the vehicle's posture and acceleration / deceleration, and therefore the oil level (P) in the oil receiving portion (7) can be easily maintained below the lower end of the rotor (2r). Since the oil inlet (79) is located below the first target oil level (Q1) and the second target oil level (Q2 (Q21, Q22)), the oil for lubrication can be appropriately supplied to the parts to be lubricated via the oil supply passage (70). In addition, by arranging the first discharge port (41) and the second discharge port (42) according to the direction in which the oil level (P) tilts, the discharge port (4) can be easily provided at an appropriate position, and the structure for providing the discharge port (4) and the inlet (79) can be prevented from becoming complicated.

[0112] Furthermore, it is preferable that, in the vehicle drive device (100), the second shaft (A2) is disposed above the first shaft (A1), and the oil supply passage (70) supplies oil accumulated in the oil receiving portion (7) from the inlet (79) to at least one of a first bearing (B1) supporting the input member (11) and an input gear (G10) rotating integrally with the input member (11).

[0113] In a case where the vehicle drive device (100) includes a rotating electric machine other than the rotating electric machine (2), for example, the internal combustion engine (3) can be driven while the wheels (W) are stopped, and the rotating electric machine other than the rotating electric machine (2) can be operated in a regenerative manner to generate electricity. At this time, many of the rotating members of the power transmission mechanism (20) that transmits power between the output member (5) and the rotating electric machine (2) do not rotate, and the amount of oil that can be supplied may decrease due to scooping or the like. On the other hand, the input member (11) that is drivingly connected to the internal combustion engine (3) rotates together with the internal combustion engine (3), and the first bearing (B1) that supports the input member (11) and the input member (11) rotate relative to each other. According to this configuration, the oil stored in the oil receiving portion (7) can be appropriately supplied via the oil supply passage (70) to the input gear (G10) that rotates integrally with the input member (11) and the first bearing (B1) that rotatably supports the input member (11).

[0114] In addition, the vehicle drive device (100) includes a case (9) having a first chamber (91) that houses the rotating electric machine (2), a second chamber (92) that houses the power transmission mechanism (20), and a partition wall (95) that separates the first chamber (91) and the second chamber (92), and it is preferable that the oil supply passage (70) penetrates the partition wall (95) to connect the first chamber (91) and the second chamber (92) and supplies oil from the oil receiving portion (7) arranged in the first chamber (91) to the second chamber (92).

[0115] When the rotating electric machine (2) and the power transmission mechanism (20) are accommodated in the first chamber (91) and the second chamber (92), respectively, the oil receiving portion (7) for receiving the oil supplied to the rotating electric machine (2) and dropping from the rotating electric machine (2) is preferably arranged in the first chamber (71) in which the rotating electric machine (2) is accommodated. The power transmission mechanism (20) arranged in the second chamber (92) often includes many rotating members and members (e.g., bearings) for supporting the rotating members. Therefore, it is highly likely that many of the parts to be lubricated are arranged in the second chamber (92). According to this configuration, the oil supply passage (70) is formed so as to penetrate the partition wall (95) that separates the first chamber (91) and the second chamber (92) and to communicate between the first chamber (91) and the second chamber (92). Therefore, even if the parts to be lubricated are arranged in the second chamber (92), the oil accumulated in the oil receiving portion (7) can be appropriately supplied to the parts to be lubricated. [Explanation of symbols]

[0116] 1: first rotating electric machine, 2: second rotating electric machine (rotating electric machine), 2r: second rotor (rotor), 3: internal combustion engine, 4: exhaust port, 5: output member, 7: first oil receiving portion (oil receiving portion), 7B: second first oil receiving portion (oil receiving portion), 9: case, 11: first input member (input member arranged on first shaft), 20: power transmission mechanism, 41: first exhaust port, 42: second exhaust port, 70: first oil supply passage (oil supply passage), 71: first first oil passage (oil supply passage), 77: second second No. 1 oil passage (oil supply passage), 79: inlet, 91: first chamber, 92: second chamber, 95: partition wall, 100: vehicle drive device, A1: first shaft, A2: second shaft, B1: first bearing, G10: first input gear (input gear that rotates integrally with the input member), P: oil level, P0: reference oil level, Q: restricted oil level, Q1: first target oil level, Q2: second target oil level, Q21: first second target oil level (second target oil level), Q22: second second target oil level (second target oil level), W: wheel

Claims

1. an input member drivingly connected to the internal combustion engine and disposed on the first shaft; An output member drivingly connected to the wheels; a rotating electric machine including a rotor, the rotating electric machine being disposed on a second axis separate from the first axis and parallel to the first axis; a power transmission mechanism that transmits power between the input member, the output member, and the rotating electric machine, an oil receiving portion disposed below the rotating electric machine so as to receive cooling oil that is supplied to the rotating electric machine and drops from the rotating electric machine; an oil supply passage that supplies the oil accumulated in the oil receiving portion to a portion to be lubricated from an inlet formed facing the oil receiving portion; a discharge port formed facing the oil receiving portion and discharging oil from the oil receiving portion, A vehicle drive device, wherein the outlet is provided so as to have a portion in the oil receiving portion that is located above a reference oil level set below the rotor and above the inlet, and below a restricted oil level, which is an oil level that has come into contact with the rotor due to tilting caused by a change in vehicle posture and acceleration / deceleration.

2. The vehicle drive device according to claim 1 , wherein the inlet is provided so as to be located below an oil level that is parallel to the restricted oil level and passes through a lower end of the outlet.

3. The restricted oil level includes a first target oil level, which is an oil level that comes into contact with the rotor as a result of the vehicle tilting in the longitudinal direction, and a second target oil level, which is an oil level that comes into contact with the rotor as a result of the vehicle tilting in the lateral direction, The vehicle drive device according to claim 1 or 2, wherein the outlet is provided to have a portion located below both the first target oil level and the second target oil level.

4. The restricted oil level includes a first target oil level, which is an oil level that comes into contact with the rotor as a result of the vehicle tilting in the longitudinal direction, and a second target oil level, which is an oil level that comes into contact with the rotor as a result of the vehicle tilting in the lateral direction, The outlet includes a first outlet and a second outlet, The first discharge port is provided to have a portion located below the first target oil level, The vehicle drive device according to claim 1 or 2, wherein the second drain outlet is provided to have a portion located below the second target oil level.

5. The second shaft is disposed above the first shaft, 3. The vehicle drive device according to claim 1, wherein the oil supply passage supplies oil accumulated in the oil receiving portion from the inlet to at least one of a first bearing supporting the input member and an input gear rotating integrally with the input member.

6. a case including a first chamber that houses the rotating electric machine, a second chamber that houses the power transmission mechanism, and a partition wall that separates the first chamber from the second chamber; The oil supply passage passes through the partition wall to communicate between the first chamber and the second chamber, and supplies oil from the oil receiving portion disposed in the first chamber to the second chamber. The vehicle drive device according to claim 1 or 2.

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