JP2020022344A - Cooling structure of rotary electric machine and vehicle drive device - Google Patents

Abstract

To realize a cooling structure of a rotary electric machine capable of cooling not only stator but also a rotor properly.SOLUTION: A cooling structure of a rotary electric machine MG2 includes: a supply oil passage 90 connected to a discharge port of an oil pump; a first oil passage 91 which is disposed at the upper side relative to a stator 21 in a vertical direction and has a supplied part connected to the supply oil passage 90, a discharge hole which is formed closer to the first axial side L1 than the supplied part and discharges oil to the stator 21, and a discharge part which is formed closer to the first axial side L1 than the discharge hole; a second oil passage 92 formed at an interior of a rotor shaft 26; and a third oil passage 93 connecting the discharge part of the first oil passage 91 with the second oil passage 92. The third oil passage 93 is provided along a first wall part 31 disposed at the first axial side L1 with respect to the rotary electric machine MG2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling structure for a rotating electric machine housed in a case, and a vehicle drive device provided with such a cooling structure for a rotating electric machine.

  An example of the cooling structure of the rotating electric machine as described above is disclosed in JP-A-2015-89314 (Patent Document 1). Hereinafter, reference numerals in parentheses in the description of the background art are those of Patent Document 1. In Patent Document 1, as a cooling structure for a motor (2) housed in a case (3), a cooling pipe (10) having a plurality of small holes (12) is provided inside a case (3) with a stator (10). A configuration is described in which the stator (22) is cooled by discharging the oil pumped from the pump (31) from the small hole (12) toward the stator (22).

  By the way, when cooling the rotating electric machine, it is sometimes desirable that not only the stator but also the rotor can be appropriately cooled. For example, when the rotating electric machine to be cooled is a permanent magnet type rotating electric machine having a rotor having a structure in which a permanent magnet is embedded in a rotor core, irreversible demagnetization occurs when the temperature of the permanent magnet becomes excessively high. Therefore, it is desirable that the rotor can be appropriately cooled. Although it is possible to avoid the problem of irreversible demagnetization by using a permanent magnet having a high coercive force, it is necessary to add a rare metal enough to secure a sufficient coercive force to the permanent magnet, which increases cost. Will be invited.

JP 2015-89314 A

  Therefore, it is desired to realize a cooling structure for a rotating electric machine that can appropriately cool not only the stator but also the rotor.

  In view of the above, the characteristic configuration of the cooling structure of the rotating electric machine housed in the case includes an oil pump, a supply oil passage connected to a discharge port of the oil pump, and a vertical direction with respect to a stator of the rotating electric machine. An oil passage arranged on the upper side, a supply target connected to the supply oil passage, and an axial first side which is one side in the axial direction of the rotary electric machine with respect to the supply target. A first oil passage having a discharge hole for discharging oil toward the stator, and a discharge portion formed on the first side in the axial direction with respect to the discharge hole, and a rotor of the rotating electric machine fixed. A second oil passage formed inside the rotor shaft, and a third oil passage connecting the discharge portion of the first oil passage and the second oil passage, wherein the third oil passage comprises: Along a first wall portion disposed on the first axial side with respect to the rotating electric machine in the case. In that provided Te there.

According to the above configuration, the oil in the first oil passage is discharged from the discharge hole toward the stator, and the stator can be cooled. Further, the rotor can be cooled by flowing the oil through the second oil passage formed inside the rotor shaft.
According to the above-described characteristic configuration, since the third oil passage that connects the discharge portion of the first oil passage and the second oil passage is provided, one of the oil supplied from the supply oil passage to the first oil passage is provided. The part can be supplied to the second oil passage through the third oil passage to cool the rotor appropriately. Further, as described above, the oil passage for supplying oil to the second oil passage is partially shared with the oil passage for supplying oil to the first oil passage, so that the oil passage configuration is complicated. Can be suppressed.
As described above, according to the above-described characteristic configuration, it is possible to realize a cooling structure for a rotating electric machine that can appropriately cool not only the stator but also the rotor.

  Further features and advantages of the cooling structure of the rotating electric machine will be clear from the following description of the embodiments described with reference to the drawings.

Sectional view of the vehicle drive device according to the embodiment. Partial enlarged view of FIG. Skeleton diagram of the vehicle drive device according to the embodiment The figure which shows the arrangement | positioning relationship in the axial direction view of each component of the vehicle drive device which concerns on embodiment. Simplified diagram of a hydraulic circuit according to an embodiment

  An embodiment of a cooling structure of a rotating electric machine and a vehicle drive device will be described with reference to the drawings. In the embodiment described below, the second stator 21 corresponds to a “stator”, the second rotor 24 corresponds to a “rotor”, the second rotor shaft 26 corresponds to a “rotor shaft”, and the first rotor The discharge port 52a corresponds to the “discharge port”, the first supplied portion 91a corresponds to the “supplied portion”, the first discharge hole 91b corresponds to the “discharge hole”, and the fourth oil passage 94 corresponds to the “cooling”. The second rotary electric machine MG2 corresponds to a "rotary electric machine", the first oil pump OP1 corresponds to an "oil pump", and the third oil flow pipe 43 corresponds to a "tubular member".

  In the following description, the vertical direction V (see FIG. 4) refers to the vertical direction in the state of use of the rotating electrical machine to be cooled, that is, the vertical direction when the rotating electrical machine to be cooled is arranged in the direction of use. means. In the present embodiment, since the cooling structure of the rotating electric machine is provided in the vehicle drive device, the vertical direction V coincides with the vertical direction when the vehicle drive device is mounted on the vehicle. The terms “upper” and “lower” mean the upper and lower sides in the vertical direction V. The directions of the members in the following description represent the directions in a state where they are assembled to a device (in this embodiment, a vehicle drive device) in which a cooling structure for a rotating electric machine is provided. Note that terms relating to dimensions, arrangement directions, arrangement positions, and the like of the respective members are concepts including a state in which there is a difference due to an error (an error that is allowable in manufacturing).

  In this specification, “drive connection” means a state in which two rotating elements are connected so as to be able to transmit driving force (synonymous with torque). This concept includes a state in which two rotating elements are connected so as to rotate integrally, and a state in which 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 (shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at a variable speed, and an engagement device that selectively transmits rotation and driving force. (A friction engagement device, a meshing engagement device, etc.) may be included. However, the term "drive connection" for each rotating element of the planetary gear mechanism means a state in which three rotating elements included in the planetary gear mechanism are drivingly connected to each other without passing through another rotating element. .

  Further, in this specification, the “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor generator that performs both functions of a motor and a generator as necessary. . Further, in the present specification, regarding the arrangement of two members, “overlap in a specific direction” means that when a virtual straight line parallel to the line of sight is moved in each direction orthogonal to the virtual line, This means that at least a region where the virtual straight line intersects both of the two members exists.

  In the present embodiment, the cooling structure for the rotating electric machine is provided in the vehicle drive device 1. The vehicle drive device 1 is a device that transmits a driving force of a driving force source (a driving force source of the wheels W) to an output member 4 that is drivingly connected to the wheels W, and causes the vehicle to travel. As shown in FIG. 3, in the present embodiment, the vehicle drive device 1 includes both the internal combustion engine EG and the rotary electric machines (here, the first rotary electric machine MG1 and the second rotary electric machine MG2) as the driving force sources of the wheels W. (Hybrid vehicle drive device) for driving a vehicle (Hybrid vehicle) including the following. Specifically, the vehicle drive device 1 is a so-called two-motor split type hybrid vehicle drive device. The internal combustion engine EG is a prime mover (a gasoline engine, a diesel engine, or the like) driven by combustion of fuel inside the engine to extract power.

  A cooling structure for a rotating electric machine according to the present disclosure is a cooling structure for a rotating electric machine housed in a case. That is, the cooling structure of the rotating electric machine according to the present disclosure targets the rotating electric machine housed in the case as a cooling target. In the present embodiment, as shown in FIG. 1, the first rotating electrical machine MG1 and the second rotating electrical machine MG2 housed in the case 30 are to be cooled. That is, in the present embodiment, the vehicle drive device 1 includes a cooling structure for the first rotating electrical machine MG1 and the second rotating electrical machine MG2. The case 30 also houses other devices or mechanisms included in the vehicle drive device 1. In the present embodiment, as shown in FIG. 3, the vehicle drive device 1 includes an input member 3, an output member 4, a planetary gear mechanism PG, a counter gear mechanism, in addition to the first rotary electric machine MG1 and the second rotary electric machine MG2. CG, an output differential gear device DF, a first oil pump OP1, and a second oil pump OP2. These input member 3, output member 4, planetary gear mechanism PG, counter gear mechanism CG, output differential The dynamic gear unit DF, the first oil pump OP1, and the second oil pump OP2 are also housed in the case 30.

  As shown in FIGS. 3 and 4, the first rotating electric machine MG1, the input member 3, the planetary gear mechanism PG, and the second oil pump OP2 are arranged on the first shaft A1, and the second rotating electric machine MG2 is connected to the second shaft. A2, the output member 4 and the output differential gear unit DF are disposed on the third shaft A3, the counter gear mechanism CG is disposed on the fourth shaft A4, and the first oil pump OP1 is disposed on the fifth shaft A4. It is arranged on A5. The first axis A1, the second axis A2, the third axis A3, the fourth axis A4, and the fifth axis A5 are different axes from each other, and are axes (virtual axes) arranged in parallel with each other. Hereinafter, a direction parallel to each of the axes (A1 to A5) (that is, an axis direction common to the axes) is referred to as “axial direction L”. One side in the axial direction L is referred to as “first side L1 in the axial direction”, and the other side in the axial direction L (ie, the side opposite to the first side L1 in the axial direction L) is referred to as the “second side in the axial direction”. L2 ". In the present embodiment, the vehicle drive device 1 is mounted on the vehicle with the axial direction L oriented along a horizontal plane. Further, in the present embodiment, the vehicle drive device 1 is mounted on the vehicle such that the axial direction L is along the left-right direction of the vehicle.

  As shown in FIG. 1, the first rotating electric machine MG1 includes a first stator 11 and a first rotor 14 rotatably supported by the first stator 11. The first stator 11 includes a first stator core 12 fixed to the case 30 and a first coil end 13. A coil is wound around the first stator core 12, and the first coil end portion 13 is a portion of the coil projecting in the axial direction L from the first stator core 12. The first stator 11 includes first coil end portions 13 on both sides of the first stator core 12 in the axial direction L. The first rotor 14 is fixed to the first rotor shaft 16 and rotates integrally with the first rotor shaft 16. In the present embodiment, the first rotating electrical machine MG1 is a permanent magnet type rotating electrical machine (here, an embedded permanent magnet synchronous motor), and the first rotor 14 includes a rotor core and a permanent magnet embedded inside the rotor core. have. Further, in the present embodiment, the first rotating electric machine MG1 is an inner-rotor-type rotating electric machine, and the first rotor 14 is located radially inward of the first stator core 12 (a radial direction based on the first axis A1). Are located in

  As shown in FIG. 1, the second rotating electrical machine MG2 includes a second stator 21 and a second rotor 24 rotatably supported by the second stator 21. The second stator 21 includes a second stator core 22 fixed to the case 30 and a second coil end portion 23. A coil is wound around the second stator core 22, and the second coil end portion 23 is a portion of the coil that projects from the second stator core 22 in the axial direction L. The second stator 21 includes second coil end portions 23 on both sides of the second stator core 22 in the axial direction L. The second rotor 24 is fixed to the second rotor shaft 26 and rotates integrally with the second rotor shaft 26. In the present embodiment, the second rotating electric machine MG2 is a permanent magnet type rotating electric machine (here, an embedded permanent magnet synchronous motor), and the second rotor 24 includes a rotor core and a permanent magnet embedded inside the rotor core. have. In the present embodiment, the second rotating electric machine MG2 is an inner-rotor-type rotating electric machine, and the second rotor 24 is located radially inward of the second stator core 22 (a radial direction based on the second axis A2). Are located in

  The planetary gear mechanism PG includes a first rotating element 67 that is drivingly connected to the first rotating electric machine MG1, a second rotating element 68 that is drivingly connected to the output member 4, and a third rotating element that is drivingly connected to the input member 3. 69. In the present embodiment, the first rotating element 67 is connected so as to rotate integrally with the first rotating electric machine MG1 (the first rotor shaft 16), and the second rotating element 68 is connected to a counter gear mechanism CG, which will be described later. The distribution output gear 64 meshing with the first gear 61 is connected so as to rotate integrally, and the third rotating element 69 is connected so as to rotate integrally with the input member 3. Here, the input member 3 is a member (a shaft member in the present embodiment) that is drivingly connected to the internal combustion engine EG (an output shaft such as a crankshaft). The input member 3 is connected to rotate integrally with the internal combustion engine EG, or is connected to the internal combustion engine EG via another member such as a damper or a clutch. The output member 4 is a member that is drivingly connected to the wheel W. In the present embodiment, the output member 4 is a member that rotates integrally with the wheel W. That is, a member (for example, a side gear) that rotates integrally with the wheel W in the output differential gear device DF, or a member that forms a drive shaft that connects the output differential gear device DF and the wheel W is output. Member 4.

  In the present embodiment, the planetary gear mechanism PG is a single pinion type planetary gear mechanism. In the present embodiment, the first rotating element 67 is a sun gear, the second rotating element 68 is a ring gear, and the third rotating element 69 is a carrier. Therefore, the planetary gear mechanism PG distributes the torque of the internal combustion engine EG transmitted to the third rotary element 69 to the first rotary element 67 and the second rotary element 68 (that is, the first rotary electric machine MG1 and the output member 4). To be distributed).

  The counter gear mechanism CG includes a first gear 61 that meshes with the distribution output gear 64 described above, a second gear 62 that meshes with the differential input gear 65 of the output differential gear device DF, and a first gear 61 and a second gear 62. And a connection shaft 63 that connects the two. In the present embodiment, the output gear 60 of the second rotating electrical machine MG2 is also meshed with the first gear 61. The output gear 60 is a gear for outputting the torque of the second rotating electric machine MG <b> 2, and is connected to rotate integrally with the second rotor shaft 26. In the present embodiment, the second rotor shaft 26 includes a first shaft member 26a and a second shaft member 26b connected to each other (here, spline-connected). The first shaft member 26a is disposed so as to extend from the connecting portion between the first shaft member 26a and the second shaft member 26b to the first axial side L1, and the second shaft member 26b is connected to the first shaft member 26a and the second shaft member 26b. It is arrange | positioned so that it may extend to the axial direction 2nd side L2 from the connection part with the biaxial member 26b. The second rotor 24 is fixed to the outer peripheral surface of the first shaft member 26a, and the output gear 60 is formed on the outer peripheral surface of the second shaft member 26b. In the present embodiment, the end of the second rotor shaft 26 on the second axial side L2 (here, the end of the second shaft member 26b on the second axial side L2) is formed by a second wall 32 described later. Are also disposed on the second axial side L2. The output gear 60 is also disposed on the second axial side L2 with respect to the second wall 32.

  The output differential gear device DF distributes and transmits the torque input to the differential input gear 65 to the pair of left and right output members 4 (that is, distributes the torque to the pair of left and right wheels W). The output differential gear device DF is configured using, for example, a bevel gear type or planetary gear type differential gear mechanism.

  Since the vehicle drive device 1 according to the present embodiment is configured as described above, the first rotary electric machine is in operation during the continuously variable speed travel mode in which the vehicle travels by transmitting the torque of the internal combustion engine EG to the wheels W. MG1 outputs a reaction torque corresponding to the torque distributed to first rotating element 67. At this time, the first rotating electric machine MG1 basically functions as a generator, and generates power by the torque distributed to the first rotating element 67. Further, during the execution of the continuously variable transmission mode, the torque attenuated with respect to the torque of the internal combustion engine EG is distributed to the second rotating element 68 as the torque for driving the wheels W, and the second rotating electric machine MG2 is If necessary, a torque is output so as to compensate for a shortfall in the wheel required torque (torque required to be transmitted to the wheel W). Further, during the execution of the electric traveling mode in which the vehicle travels by transmitting only the torque of the second rotating electrical machine MG2 to the wheels W, the internal combustion engine EG is basically in a stopped state in which fuel supply is stopped. Basically, single-rotation electric machine MG1 is in a state of idling (a state in which output torque is controlled to be zero by zero torque control).

  The vehicle drive device 1 includes a drive transmission mechanism 2 that transmits the drive force of the second rotary electric machine MG2 to the output member 4. In the present embodiment, the drive transmission mechanism 2 includes a counter gear mechanism CG and an output differential gear device DF. In the present embodiment, the second rotating electrical machine MG2 is disposed so as to overlap with the drive transmission mechanism 2 when viewed in the axial direction L along the axial direction L. Specifically, as shown in FIG. 4, the second rotating electrical machine MG2 is disposed so as to overlap with the counter gear mechanism CG when viewed in the axial direction L. Here, the second rotating electrical machine MG2 is arranged so as to overlap with the fourth shaft A4 on which the counter gear mechanism CG is arranged as viewed in the axial direction L. In FIG. 4, the reference pitch circle is shown for each gear, the outer shape of the first stator 11 (the outer shape of the first stator core 12) for the first rotating electrical machine MG1, and the second stator for the second rotating electrical machine MG2. 21 shows the outer shape of 21 (the outer shape of the second stator core 22).

  In the present embodiment, as shown in FIG. 1, the drive transmission mechanism 2 is disposed on the second rotating electrical machine MG2 on the side opposite to the first axial side L1 in the axial direction L (second axial side L2). Have been. As described above, in the present embodiment, the drive transmission mechanism 2 includes the counter gear mechanism CG, and the counter gear mechanism CG is arranged on the second axial side L2 with respect to the second rotary electric machine MG2. Specifically, case 30 is arranged on first axial side L1 with respect to second rotating electrical machine MG2, and on first axial wall L2 with respect to second rotating electrical machine MG2. And a second wall portion 32 to be formed. The first wall portion 31 and the second wall portion 32 are both support walls that support the second rotor shaft 26. Here, the case 30 further includes a third wall portion 34 arranged on the second axial side L2 with respect to the second wall portion 32. The third wall portion 34 is also a support wall that supports the second rotor shaft 26. Specifically, the first shaft member 26a is rotatably supported at two places in the axial direction L by the first wall portion 31 and the second wall portion 32, and the second shaft member 26b is And the third wall portion 34 rotatably supported at two positions in the axial direction L. The counter gear mechanism CG is disposed on the second axial side L2 with respect to the second wall 32. Further, the counter gear mechanism CG is disposed on the first axial side L1 with respect to the third wall portion 34. Here, the first wall portion 31 is disposed adjacent to the second rotating electrical machine MG2 on the first axial side L1, and the second wall portion 32 is arranged in the second rotating electrical machine MG2 in the axial second direction. It is arranged adjacent to the side L2. In the present embodiment, the first wall 31 is a member separate from the peripheral wall of the case 30 (a cylindrical wall surrounding the second rotary electric machine MG2 and the like in the axial direction L). Joined from the first axial side L1 so as to cover the opening on the first axial side L1. That is, in the present embodiment, the first wall 31 is a cover member (specifically, a rear cover that covers an opening of the peripheral wall opposite to the side where the internal combustion engine EG is arranged).

  As shown in FIG. 3, the vehicle drive device 1 includes a first oil pump OP1. In the present embodiment, the first oil pump OP1 is arranged on a different axis from the second rotating electric machine MG2. Note that the first oil pump OP1 may be configured to be coaxial with the second rotary electric machine MG2. Although not shown, an oil reservoir for storing oil is formed inside the case 30, and as shown in FIG. 5, the first oil pump OP1 is connected to the oil reservoir via a first strainer ST1. Aspirate the oil. As shown in FIG. 3, in the present embodiment, the vehicle drive device 1 further includes a second oil pump OP2. In the present embodiment, the second oil pump OP2 is arranged coaxially with the first rotating electric machine MG1. As shown in FIG. 5, the second oil pump OP2 sucks the oil in the oil storage unit via the second strainer ST2. The first strainer ST1 and the second strainer ST2 are filters for removing foreign matter contained in oil. Here, a first strainer ST1 that filters the oil sucked from the oil reservoir by the first oil pump OP1 and a second strainer ST2 that filters the oil sucked from the oil reservoir by the second oil pump OP2 are separately provided. Although the case where it is provided is illustrated, a configuration in which the first oil pump OP1 and the second oil pump OP2 suck the oil in the oil storage unit via the common strainer may be adopted.

  In the present embodiment, the first oil pump OP1 is driven by rotation of the drive transmission mechanism 2. Specifically, the first oil pump OP1 is a rotating member included in the drive transmission mechanism 2, and is a rotating member that is inseparably connected to the wheel W (ie, a rotating member that always rotates in conjunction with the wheel W). ) Is configured to be driven by rotation of the member. Therefore, when the vehicle is traveling, regardless of whether the continuously variable transmission traveling mode or the electric traveling mode is being executed (that is, even if the internal combustion engine EG is stopped), One oil pump OP1 can be driven. In the present embodiment, as shown in FIG. 3, the first oil pump OP1 is configured to be driven by rotation of the differential input gear 65 of the output differential gear device DF. Specifically, a pump drive gear 66 is provided on a first pump drive shaft 53a that is a drive shaft of the first oil pump OP1. Then, as the pump drive gear 66 meshes with the differential input gear 65, the first oil pump OP1 is driven by the rotation of the differential input gear 65.

  The pump drive gear 66 meshes with a gear other than the differential input gear 65 (the output gear 60, the first gear 61, or the second gear 62 in the present embodiment) provided in the drive transmission mechanism 2, or the pump drive gear 66 The first oil pump OP1 is driven by the rotation of the drive transmission mechanism 2 by having the gear 66 mesh with a gear (the distribution output gear 64 in the present embodiment) that meshes with the gear of the drive transmission mechanism 2. It can also be configured. In addition, the first pump drive shaft 53a and a rotating member provided in the drive transmitting mechanism 2 (or a rotating member which rotates in conjunction with the rotating member provided in the drive transmitting mechanism 2) form a winding transmission mechanism (a chain and a sprocket). (A used mechanism, a mechanism using a belt and a pulley, etc.), the first oil pump OP1 can be driven by the rotation of the drive transmission mechanism 2.

  In the present embodiment, the second oil pump OP2 is driven by the rotation of the input member 3. Specifically, a second pump drive shaft 53b, which is a drive shaft of the second oil pump OP2, is connected to rotate integrally with the input member 3. In addition, as shown in FIG. 2, the second pump drive shaft 53b is connected to rotate integrally with the pump rotor 54 of the second oil pump OP2. Therefore, regardless of whether the vehicle is running or not, the second oil pump OP2 can be driven by the torque of the internal combustion engine EG. In addition, at least one of the first oil pump OP1 and the second oil pump OP2 can be an electric oil pump driven by a dedicated electric motor for driving the pump.

  Next, the cooling structure of the rotating electric machine according to the present embodiment will be specifically described. As described below, the cooling structure of the rotating electric machine includes the first oil pump OP1, the supply oil passage 90, the first oil passage 91, the second oil passage 92, and the third oil passage 93. In addition, the second rotary electric machine MG2 can be cooled by the oil discharged from the first oil pump OP1. That is, the cooling structure of the second rotary electric machine MG2 includes the first oil pump OP1, the supply oil passage 90, the first oil passage 91, the second oil passage 92, and the third oil passage 93. Further, in the present embodiment, the cooling structure of the rotating electrical machine further includes the fourth oil passage 94, thereby enabling the first rotating electrical machine MG1 to be cooled by the oil discharged from the first oil pump OP1. In the present embodiment, the cooling structure of the rotating electric machine further includes an oil cooler OC.

  As shown in FIG. 5, the supply oil passage 90 is connected to a first discharge port 52a that is a discharge port of the first oil pump OP1. In FIG. 5, the line segment indicating the supply oil passage 90 is thicker than the line segments indicating the other oil passages. In FIG. 5, the direction in which oil flows in each oil passage is indicated by an arrow. In the present embodiment, the supply oil passage 90 includes a first discharge oil passage 81, a merge oil passage 83, and a downstream oil passage 84 in this order from the upstream side. Specifically, the upstream end of the first discharge oil passage 81 is connected to the first discharge port 52a, and the downstream end of the first discharge oil passage 81 is connected to the upstream end of the merged oil passage 83. It is connected. The downstream end of the joining oil passage 83 is connected to the upstream end of the downstream oil passage 84, and the downstream end of the downstream oil passage 84 is connected to the upstream end of the first oil passage 91 ( It is connected to a first supplied portion 91a) described later. Therefore, the oil discharged from the first oil pump OP1 flows through the first discharge oil passage 81, the merge oil passage 83, and the downstream oil passage 84 in this order, and is supplied to the first oil passage 91. The first discharge oil passage 81 is provided with a first check valve 51a that regulates the flow of oil toward the upstream side.

  As described above, in the present embodiment, the vehicle drive device 1 includes the second oil pump OP2 in addition to the first oil pump OP1. In the present embodiment, the upstream end of the second discharge oil passage 82 is connected to the second discharge port 52b, which is the discharge port of the second oil pump OP2, and the downstream end of the second discharge oil passage 82. The portion is connected to the upstream end of the junction oil passage 83. That is, the joining oil passage 83 is an oil passage formed by joining the first discharge oil passage 81 and the second discharge oil passage 82. The second discharge oil passage 82 is provided with a second check valve 51b that regulates the flow of oil toward the upstream side.

  As shown in FIG. 5, in this embodiment, an oil cooler OC is provided in the supply oil passage 90. The oil cooler OC is a heat exchanger that cools oil. The oil cooler OC is, for example, a water-cooled or air-cooled oil cooler. In the present embodiment, the oil cooler OC is provided in the junction oil passage 83. In addition, a relief valve RV (in this embodiment) that discharges a part of the oil and adjusts the oil pressure of the joining oil passage 83 when the oil pressure becomes excessive in the portion of the joining oil passage 83 upstream of the oil cooler OC. In the embodiment, two relief valves RV) are provided.

  As shown in FIG. 2, the first oil passage 91 is disposed above the second stator 21 in the vertical direction V (see FIG. 4). The first oil passage 91 is connected to the supply oil passage 90 (in the present embodiment, the downstream oil passage 84), and the first supply portion 91 a and the first supply portion 91 a in the axial direction on the first side. L1 has a first discharge hole 91b for discharging oil toward the second stator 21, and a discharge portion 91c formed on the first axial side L1 with respect to the first discharge hole 91b. I have. This allows the oil supplied from the supply oil passage 90 to the first oil passage 91 to be discharged from the first discharge holes 91b toward the second stator 21, thereby cooling the second stator 21. .

  The first oil passage 91 is disposed so as to overlap the second stator 21 when viewed in the vertical direction V. As shown in FIG. 2, in the present embodiment, the first oil passage 91 is provided at a position overlapping the second coil end portion 23 on the first axial side L1 in the vertical direction V when viewed from the vertical direction V. 91b, a first discharge hole 91b provided at a position overlapping the second coil end portion 23 on the second axial side L2 in the vertical direction V, and a first discharge hole 91b provided at a position overlapping the second stator core 22 as viewed in the vertical direction V. A first discharge hole 91b. Thus, the oil discharged from the first discharge holes 91b can be supplied to the second stator 21 with a relatively simple configuration using gravity.

  The first oil passage 91 is an oil passage having both ends of the first supplied portion 91a and the discharge portion 91c, and the discharge portion 91c is disposed on the first axial side L1 with respect to the first supplied portion 91a. You. Therefore, the first oil passage 91 extends at least between the first supplied portion 91a and the discharge portion 91c in the axial direction L. In the present embodiment, the first oil passage 91 does not include a bent portion that reverses the flow of oil from the first supplied portion 91a to the discharge portion 91c in the axial direction L, and the first oil passage 91 is It is formed so as to extend uniformly from the one supplied portion 91a to the discharge portion 91c toward the first axial side L1. That is, as shown by arrows in FIG. 1, the direction in which the oil flows in each oil passage, an oil flow is formed in the first oil passage 91 toward the first axial side L1. Note that the extending direction of the first oil passage 91 may be a direction parallel to the axial direction L or a direction inclined with respect to the axial direction L.

  As shown in FIG. 1, the second oil passage 92 is an oil passage formed inside the second rotor shaft 26 to which the second rotor 24 of the second rotary electric machine MG2 is fixed. The second rotor shaft 26 is formed of a cylindrical member extending in the axial direction L, and a space surrounded by the inner peripheral surface of the second rotor shaft 26 forms a second oil passage 92 extending in the axial direction L. I have. Thereby, the second rotor 24 can be cooled by the oil supplied to the second oil passage 92. In the second oil passage 92, a flow of oil toward the second axial side L2 is formed. As described above, in the present embodiment, the second rotor shaft 26 includes the first shaft member 26a and the second shaft member 26b connected to each other. The portion of the second oil passage 92 on the first axial side L1 is formed inside the first shaft member 26a, and the portion of the second oil passage 92 on the second axial side L2 is formed on the second shaft member 26b. Is formed inside.

  In the present embodiment, as shown in FIG. 1, the second rotor shaft 26 (here, the first shaft member 26 a) is provided with a second oil hole 72 that communicates the inner peripheral surface and the outer peripheral surface of the second rotor shaft 26. It has. The second oil hole 72 is formed so as to penetrate the cylindrical portion of the second rotor shaft 26 in a radial direction (a radial direction based on the second axis A2; the same applies in the following paragraphs). A second rotor oil passage 25 is formed inside the second rotor 24 (the rotor core of the second rotor 24). Although not described in detail, the second rotor oil passage 25 communicates between the axial oil passage extending in the axial direction L, the radially extending inner circumferential surface of the second rotor 24 (rotor core), and the axial oil passage. And a radial oil passage. Thereby, the oil in the second oil passage 92 is supplied from the second oil hole 72 to the oil passage 25 in the second rotor, so that the second rotor 24 can be cooled. In the present embodiment, the axial oil passage of the second rotor oil passage 25 is formed so as to open at both ends in the axial direction L of the second rotor 24 (rotor core). It is also possible to supply the oil after cooling the second coil end portion 23 from the radially inner side to the second coil end portion 23 to cool the second coil end portion 23.

  By the way, as described above, the first oil pump OP1 is disposed on a different axis from the second rotating electrical machine MG2 (that is, on a different axis from the second rotor shaft 26). In this case, depending on the configuration of the vehicle drive device 1, an oil that directly connects the first discharge port 52 a of the first oil pump OP <b> 1 and the second oil passage 92 formed inside the second rotor shaft 26. Providing a road may be difficult due to restrictions on the mounting space of the vehicle drive device 1 in the vehicle. In view of this point, the cooling structure of the rotating electric machine includes the third oil passage 93 connecting the discharge portion 91c of the first oil passage 91 and the second oil passage 92. The third oil passage 93 is provided along the first wall portion 31 arranged on the first axial side L1 with respect to the second rotating electric machine MG2 in the case 30. That is, at least a part of the third oil passage 93 is provided along the first wall portion 31, and in the present embodiment, the portion of the third oil passage 93 except the upstream end and the downstream end is the third oil passage 93. It is provided along one wall portion 31. By providing the third oil passage 93 along the first wall portion 31 in this manner, the vehicle drive device 1 in a portion where the third oil passage 93 is provided (that is, a portion where the second rotary electric machine MG2 is disposed). It is possible to provide a third oil passage 93 for supplying oil discharged from the first oil pump OP1 to the second oil passage 92 while suppressing an increase in size in the axial direction L.

  In the present embodiment, as shown in FIGS. 1 and 2, the connecting portion 90 a, which is a portion connected to the first supplied portion 91 a in the supply oil passage 90, is connected to the second rotating electrical machine MG 2 in the case 30. And is provided along the second wall portion 32 disposed on the second axial side L2. The connection portion 90a is a portion including the downstream end portion of the supply oil passage 90 (in this embodiment, the downstream oil passage 84), and at least a part of the connection portion 90a is provided along the second wall portion 32. Have been.

  As shown in FIG. 1, in the present embodiment, the third oil passage 93 is formed inside the first wall 31. Note that at least a portion of the third oil passage 93 is formed outside the first wall portion 31 (for example, inside a tubular member attached to the first wall portion 31 from the second axial side L2). Formed). Further, in the present embodiment, the first wall portion 31 is formed in a cylindrical shape protruding toward the second axial side L2, and the opening of the second axial side L2 is disposed inside the second rotor shaft 26. A second end of the third oil passage 93 is defined by a space surrounded by an inner peripheral surface of the second connection portion 33b. Thereby, the downstream end of the third oil passage 93 and the upstream end of the second oil passage 92 are connected at the second connection portion 33b.

  In the present embodiment, the cooling structure of the rotating electric machine further includes a fourth oil passage 94 through which oil for cooling the first rotating electric machine MG1 flows. As shown in FIG. 5, the fourth oil passage 94 is formed so as to branch from a portion of the supply oil passage 90 downstream of the oil cooler OC. This makes it possible to supply the oil cooled by the oil cooler OC not only to the first oil passage 91 and the second oil passage 92 but also to the fourth oil passage 94.

  As shown in FIG. 2, the fourth oil passage 94 is disposed above the first stator 11 in the vertical direction V (see FIG. 4). The fourth oil passage 94 is connected to an intermediate portion of the supply oil passage 90 (in the present embodiment, a downstream end of the merge oil passage 83, in other words, an upstream end of the downstream oil passage 84). It has a second supplied portion 94a and a second discharge hole 94b formed on the first side L1 in the axial direction with respect to the second supplied portion 94a and discharging oil toward the first stator 11. . Thus, the oil supplied from the supply oil passage 90 to the fourth oil passage 94 is discharged from the second discharge hole 94b toward the first stator 11, and the first stator 11 can be cooled. .

  The fourth oil passage 94 is disposed so as to overlap the first stator 11 when viewed in the vertical direction V. As shown in FIG. 2, in the present embodiment, the fourth oil passage 94 is a second discharge hole provided at a position overlapping with the first coil end portion 13 on the first axial side L1 in the vertical direction V. 94b, a second discharge hole 94b provided at a position overlapping the first coil end portion 13 on the second axial side L2 in the vertical direction V, and a second discharge hole 94b provided at a position overlapping the first stator core 12 as viewed in the vertical direction V. A second discharge hole 94b. Thus, the oil discharged from the second discharge hole 94b can be supplied to the first stator 11 with a relatively simple configuration using gravity.

  As shown in FIGS. 2 and 5, in the present embodiment, the cooling structure of the rotating electric machine further includes a fifth oil passage 95. As shown in FIG. 2, the fifth oil passage 95 is an oil passage formed inside the second pump drive shaft 53b. The second pump drive shaft 53b is formed of a tubular member extending in the axial direction L, and a space surrounded by the inner peripheral surface of the second pump drive shaft 53b forms a fifth oil passage 95 extending in the axial direction L. Have been. As shown in FIG. 5, the fifth oil passage 95 is formed so as to branch from a portion of the second discharge oil passage 82 upstream of the second check valve 51b. The amount of oil flowing from the second discharge oil passage 82 to the fifth oil passage 95 is controlled by the second orifice 50b.

  In the fifth oil passage 95, a flow of oil toward the second axial side L2 is formed. Then, as shown in FIG. 5, the oil in the fifth oil passage 95 is supplied to the first rotating electric machine MG1 (first rotor 14) for cooling, and lubricates the planetary gear mechanism PG. Supplied for Specifically, as shown in FIG. 2, the first rotor shaft 16 is formed of a cylindrical member extending in the axial direction L, and the second pump drive shaft 53 b is formed on the inner peripheral surface of the first rotor shaft 16. It is arranged in the space surrounded by. The second pump drive shaft 53b has a third oil hole 73 that connects the inner peripheral surface and the outer peripheral surface of the second pump drive shaft 53b. The third oil hole 73 is formed so as to penetrate the cylindrical portion of the second pump drive shaft 53b in a radial direction (a radial direction based on the first axis A1; hereinafter, the same in this paragraph). Further, the first rotor shaft 16 has a first oil hole 71 that connects the inner peripheral surface and the outer peripheral surface of the first rotor shaft 16. The first oil hole 71 is formed so as to penetrate the cylindrical portion of the first rotor shaft 16 in the radial direction. A first rotor oil passage 15 is formed inside the first rotor 14 (the rotor core of the first rotor 14). Although not described in detail, the first rotor oil passage 15 communicates between the axial oil passage extending in the axial direction L, the inner circumferential surface of the first rotor 14 (rotor core) extending in the radial direction, and the axial oil passage. And a radial oil passage.

  Thereby, the oil in the fifth oil passage 95 is supplied from the third oil hole 73 to the inner peripheral surface of the first rotor shaft 16, and the oil supplied to the inner peripheral surface of the first rotor shaft 16 is The first rotor 14 can be cooled by supplying the oil to the first rotor oil passage 15 from the hole 71. In the present embodiment, the axial oil passage of the first rotor oil passage 15 is formed so as to open at both ends in the axial direction L of the first rotor 14 (rotor core). It is also possible to supply oil after cooling the first coil end portion 13 to the first coil end portion 13 from inside in the radial direction (radial direction based on the first axis A1) to cool the first coil end portion 13. Has become. Further, the oil in the fifth oil passage 95 flows into an oil passage formed inside the input member 3 and then flows through a fourth oil hole 74 (see FIGS. 1 and 2) formed in the input member 3. It is supplied for lubrication to the planetary gear mechanism PG and the like.

  As shown in FIG. 5, in the present embodiment, the cooling structure of the rotating electric machine further includes a sixth oil passage 96. The sixth oil passage 96 is formed so as to branch from a portion of the first discharge oil passage 81 upstream of the first check valve 51a. The oil in the sixth oil passage 96 is supplied to the counter gear mechanism CG and the output differential gear device DF for lubrication. The amount of oil flowing from the first discharge oil passage 81 to the sixth oil passage 96 is controlled by the first orifice 50a.

  As shown in FIGS. 1 and 2, in the present embodiment, the vehicle drive device 1 includes a tubular first oil circulation pipe 41, a tubular second oil circulation pipe 42, and a tubular third oil circulation pipe 43. Have. A fourth oil passage 94 is formed inside the first oil circulation pipe 41, a first oil passage 91 is formed inside the second oil circulation pipe 42, and a downstream oil is formed inside the third oil circulation pipe 43. A passage 84 is formed. That is, in the present embodiment, the supply oil passage 90 is formed using the third oil circulation pipe 43 that is a tubular member. Specifically, the downstream oil passage 84 provided in the supply oil passage 90 is formed using the third oil circulation pipe 43 that is a tubular member. As shown in FIG. 1, in the present embodiment, the first wall portion 31 has a first connection portion 33a formed in a cylindrical shape and protruding on the second axial side L2. An upstream end of the third oil passage 93 is formed by a space surrounded by the inner peripheral surface of the third oil passage 33a. The second oil flow pipe 42 is disposed such that the discharge portion 91c is connected to the first connection portion 33a, whereby the downstream end (discharge portion 91c) of the first oil passage 91 and the second oil flow pipe 42 are connected to each other. The upstream end of the three oil passages 93 is connected to the first connection portion 33a. The second oil flow pipe 42 is disposed such that both ends are disposed at different positions in the axial direction L (for example, along the axial direction L). The discharge portion 91c of the first oil passage 91 is formed by the opening on the first side L1. Further, the above-described first discharge hole 91b is formed so as to penetrate the cylindrical portion of the second oil flow pipe 42.

  As shown in FIG. 2, in the present embodiment, the second wall portion 32 includes a third connecting portion 33c formed in a cylindrical shape extending in the axial direction L. Then, the end of the second oil flow pipe 42 on the second axial side L2 is fitted to the inner peripheral surface of the third connection portion 33c from the first axial side L1. The end is fitted to the inner peripheral surface of the third connection portion 33c from the second axial side L2. Thus, the downstream end of the downstream oil passage 84 and the upstream end (first supplied portion 91a) of the first oil passage 91 are connected at the third connection portion 33c. The first supply portion 91a of the first oil passage 91 is formed by an opening on the second axial side L2 of the second oil flow pipe 42.

  As shown in FIG. 2, in the present embodiment, the second wall portion 32 includes a fourth connection portion 33d formed in a cylindrical shape extending in the axial direction L. The end of the first oil flow pipe 41 on the second axial side L2 is fitted to the inner peripheral surface of the fourth connection portion 33d from the first axial side L1. The end (the end opposite to the side connected to the third connection portion 33c) is fitted to the inner peripheral surface of the fourth connection portion 33d from the second axial side L2. The downstream end of the joining oil passage 83 is formed so as to open to the inner peripheral surface of the fourth connection portion 33d. Thereby, the downstream end of the merging oil passage 83, the upstream end of the downstream oil passage 84, and the upstream end (the second supplied portion 94a) of the fourth oil passage 94 are connected by the fourth connection. The connection is made at the section 33d. The first oil flow pipe 41 is disposed such that both ends are disposed at different positions in the axial direction L (for example, along the axial direction L). The second supply portion 94a of the fourth oil passage 94 is formed by the opening on the second side L2. Further, the above-mentioned second discharge hole 94b is formed so as to penetrate the cylindrical portion of the first oil flow pipe 41.

[Other embodiments]
Next, other embodiments of the cooling structure of the rotating electric machine and the vehicle drive device will be described.

(1) The configuration of the hydraulic circuit (see FIG. 5) shown in the above embodiment is an example, and the configuration of the hydraulic circuit can be changed as appropriate. For example, in the above embodiment, the configuration in which the fourth oil passage 94 is formed so as to branch off from the supply oil passage 90 has been described as an example, but the fourth oil passage 94 does not pass through the supply oil passage 90. It is configured to be connected to the second discharge oil passage 82, that is, the oil discharged by the first oil pump OP1 is supplied only to the second rotary electric machine MG2 of the first rotary electric machine MG1 and the second rotary electric machine MG2. It is also possible to adopt a configuration in which In this case, it is also possible to adopt a configuration in which the second discharge oil passage 82 does not merge with the supply oil passage 90. Further, in the above-described embodiment, the configuration in which the vehicle drive device 1 includes the second oil pump OP2 in addition to the first oil pump OP1 has been described as an example. However, the vehicle drive device 1 includes the first oil pump OP1. Alternatively, only the first oil pump OP1 of the second oil pump OP2 may be provided.

(2) In the above-described embodiment, the configuration in which the connecting portion 90a, which is a portion connected to the first supplied portion 91a in the supply oil passage 90, is provided along the second wall portion 32 has been described as an example. However, without being limited to such a configuration, a configuration in which the connection portion 90a is not provided along the second wall portion 32 is also possible.

(3) In the above-described embodiment, the configuration in which the second rotating electrical machine MG2 is disposed so as to overlap the drive transmission mechanism 2 (specifically, the counter gear mechanism CG) when viewed in the axial direction L has been described as an example. . However, without being limited to such a configuration, for example, the second rotating electric machine MG2 is located at a position different from the counter gear mechanism CG in the axial direction L so as not to overlap with the counter gear mechanism CG in the axial direction L. May be arranged. Further, in the above embodiment, the configuration in which the drive transmission mechanism 2 is disposed on the second axial side L2 with respect to the second rotary electric machine MG2 has been described as an example. However, without being limited to such a configuration, a configuration in which at least a part (for example, the counter gear mechanism CG) of the drive transmission mechanism 2 is disposed on the first axial side L1 with respect to the second rotary electric machine MG2. It can also be.

(4) The configuration of the vehicle drive device 1 shown in the above embodiment is an example, and the configuration of the vehicle drive device 1 can be appropriately changed. For example, the vehicle drive device 1 may be configured not to include the counter gear mechanism CG, and the distribution output gear 64 and the output gear 60 of the second rotating electrical machine MG2 may be configured to mesh with the differential input gear 65. In this case, unlike the above embodiment, the drive transmission mechanism 2 does not include the counter gear mechanism CG. Further, the vehicle drive device 1 does not include the output differential gear device DF, and the vehicle drive device 1 outputs the driving force of the driving force source of the wheel W to one output instead of the pair of left and right output members 4. A configuration for transmitting to the member 4 (that is, a configuration for transmitting to only one wheel W instead of the pair of left and right wheels W) can be adopted. In this case, unlike the above embodiment, the drive transmission mechanism 2 does not include the output differential gear device DF.

(5) In the above-described embodiment, the configuration in which the vehicle driving device 1 is a driving device for driving a vehicle including both the internal combustion engine EG and the rotating electric machine as a driving force source for the wheels W has been described as an example. However, without being limited to such a configuration, the vehicle driving device 1 may be a driving device for driving a vehicle that does not include the internal combustion engine EG as a driving force source for the wheels W. For example, the vehicle drive device 1 can be a drive device for driving an electric vehicle (electric vehicle) including only one or a plurality of rotating electric machines as a driving force source for the wheels W.

(6) In the above embodiment, the vehicle drive device 1 includes the first rotating electric machine MG1 and the second rotating electric machine MG2, and the cooling structure of the rotating electric machine included in the vehicle driving device 1 includes the first rotating electric machine MG1 and the first rotating electric machine MG1. The configuration that is the cooling structure of the second rotating electrical machine MG2 has been described as an example. However, without being limited to such a configuration, the vehicle driving device 1 includes only the second rotating electric machine MG2 of the first rotating electric machine MG1 and the second rotating electric machine MG2, and the rotation included in the vehicle driving device 1 is provided. The cooling structure of the electric machine may be a cooling structure of the second rotating electric machine MG2.

(7) In the above embodiment, the configuration in which the cooling structure of the rotating electric machine is provided in the vehicle drive device 1 has been described as an example. However, without being limited to such a configuration, the cooling structure of the rotating electric machine according to the present disclosure may be provided in a device or equipment other than the vehicle drive device.

(8) The configurations disclosed in the above embodiments may be applied in combination with the configurations disclosed in other embodiments (unless there is a contradiction). (Including combinations) are also possible. Regarding other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be appropriately made without departing from the spirit of the present disclosure.

[Overview of the above embodiment]
Hereinafter, an outline of the cooling structure of the rotating electric machine and the vehicle drive device described above will be described.

  A cooling structure for a rotating electric machine (MG2) housed in a case (30), comprising: an oil pump (OP1); and a supply oil passage (90) connected to a discharge port (52a) of the oil pump (OP1). An oil passage disposed above the stator (21) of the rotary electric machine (MG2) in the vertical direction (V), and a supply target (91a) connected to the supply oil passage (90); Is formed on the first side (L1) in the axial direction (L) of the rotating electric machine (MG2) with respect to the supplied portion (91a), and supplies oil toward the stator (21). A first oil passage (91) having a discharge hole (91b) for discharging, and a discharge portion (91c) formed on the first axial side (L1) of the discharge hole (91b); A rotor shaft (26) to which the rotor (24) of the electric machine (MG2) is fixed A second oil passage (92) formed therein; a third oil passage (93) connecting the discharge portion (91c) of the first oil passage (91) with the second oil passage (92); The third oil passage (93) is provided on a first wall portion (31) disposed on the first axial side (L1) with respect to the rotary electric machine (MG2) in the case (30). It is provided along.

According to this configuration, the oil in the first oil passage (91) can be discharged from the discharge hole (91b) toward the stator (21) to cool the stator (21). Further, the rotor (24) can be cooled by flowing oil through the second oil passage (92) formed inside the rotor shaft (26).
And according to the said structure, since the 3rd oil path (93) which connects the discharge part (91c) of a 1st oil path (91) and a 2nd oil path (92) is provided, a supply oil path ( 90), a part of the oil supplied to the first oil passage (91) is supplied to the second oil passage (92) via the third oil passage (93), and the rotor (24) is appropriately cooled. can do. Further, as described above, the oil passage for supplying oil to the second oil passage (92) is partially shared with the oil passage for supplying oil to the first oil passage (91). Complexity of the road configuration can be suppressed.
As described above, according to the above configuration, it is possible to realize a cooling structure of the rotating electric machine (MG2) that can appropriately cool not only the stator (21) but also the rotor (24).

  Here, a side opposite to the first axial direction (L1) in the axial direction (L) is defined as a second axial direction side (L2), and the second axial direction side (L2) of the rotor shaft (26). Of the case (30) with respect to the rotating electric machine (MG2) in the axial direction second side (L2) than the second wall portion (32) arranged in the axial direction second side (L2). It is preferable to be arranged in L2).

  When the end of the rotor shaft (26) on the second axial side (L2) is disposed closer to the second axial side (L2) than the second wall (32) as in this configuration, for example, the second wall Even if an oil passage is provided inside the portion (32), the oil passage cannot be directly connected to the end on the second axial side (L2) of the rotor shaft (26), and the rotor shaft (26) ) In order to supply oil from the end on the second axial side (L2) to the second oil passage (92), an oil passage provided inside the second wall portion (32) and the rotor shaft (26). ), It is necessary to form a connection oil passage connecting the end of the second side (L2) in the axial direction. Therefore, the configuration of the oil passage is likely to be complicated, and the connection is made by avoiding a member (for example, the drive transmission mechanism (2)) disposed on the second axial side (L2) with respect to the second wall (32). Since it is necessary to arrange the oil passage, the whole configuration is easily increased in size. On the other hand, in the cooling structure of the rotary electric machine (MG2) according to the present disclosure, as described above, the supply oil passage (90) is connected to the first oil passage (91) and the third oil passage (93) through the third oil passage (93). Since oil can be supplied to the second oil passage (92), the end of the rotor shaft (26) on the second axial side (L2) is more axially than the second wall (32) as in this configuration. Even in the case of being disposed on the second side (L2), it is possible to suppress the complexity of the oil passage configuration and the increase in the size of the entire configuration.

  Further, a side opposite to the first axial direction (L1) in the axial direction (L) is defined as a second axial direction side (L2), and is connected to the supply target portion (91a) in the supply oil passage (90). A connection portion (90a), which is a portion to be connected, is along a second wall portion (32) arranged on the second axial side (L2) with respect to the rotating electric machine (MG2) in the case (30). Preferably, it is provided.

  According to this configuration, in addition to providing the third oil passage (93) along the first wall portion (31) as described above, the connection portion (90a) of the supply oil passage (90) is provided on the second wall portion. Since these oil passages are provided along the portion (32), it is easy to appropriately provide these oil passages by utilizing the arrangement space of the wall of the case (30). Therefore, an increase in the size of the entire configuration can be suppressed.

  It is preferable that the supply oil passage (90) is formed using a tubular member (43).

  If an attempt is made to directly connect the supply oil passage (90) and the second oil passage (92), it is necessary to form a branch from the supply oil passage (90) to the second oil passage (92). The connection between the supply oil passage (90) and another oil passage increases. In general, as the number of connections between the supply oil passage (90) and other oil passages increases, the processing accuracy and assembly accuracy required for the supply oil passage (90) increase, and dimensional tolerances for facilitating assembly. If the assembly tolerance is increased, the oil tends to leak at the connection portion. This problem is likely to be remarkable when the supply oil passage (90) is formed using the tubular member (43) as in the present configuration. However, in the cooling structure of the rotating electric machine (MG2) according to the present disclosure, the supply oil is not supplied. Since there is no need to form a branch from the passage (90) to the second oil passage (92), such a problem can be easily avoided.

  The case (30) accommodates a first rotating electric machine (MG1) and a second rotating electric machine (MG2), which is the rotating electric machine (MG2), and is provided in the supply oil passage (90). An oil cooler (OC) and an oil passage branched from a portion of the supply oil passage (90) downstream of the oil cooler (OC), the oil being used to cool the first rotating electric machine (MG1). And a cooling oil passage (94) through which the fluid flows.

  According to this configuration, oil can be supplied from the supply oil passage (90) not only to the first oil passage (91) but also to the cooling oil passage (94). An oil passage for cooling the (MG1) and the second rotary electric machine (MG2) is partially shared, thereby preventing the oil passage configuration from becoming complicated. Further, according to the above configuration, the cooling oil passage (94) is formed so as to branch from a portion of the supply oil passage (90) downstream of the oil cooler (OC), so that the first rotating electric machine ( The oil cooled by the oil cooler (OC) is supplied to both the MG1) and the second rotary electric machine (MG2) to appropriately cool the first rotary electric machine (MG1) and the second rotary electric machine (MG2). be able to.

  Further, it is preferable that the oil pump (OP1) is arranged on a separate shaft from the rotating electric machine (MG2).

  In the cooling structure of the rotating electric machine (MG2) according to the present disclosure, as in the present configuration, the oil pump (OP1) is on a different axis from the rotating electric machine (MG2) (that is, on a different axis from the second oil passage (92)). ) Even if it is arranged, the second oil passage from the supply oil passage (90) via the first oil passage (91) and the third oil passage (93) while suppressing the complexity of the oil passage configuration. Oil can be supplied to (92).

  The vehicle drive device (1) includes a cooling structure for the rotating electric machine (MG2), and outputs an output member (4) that is drivingly connected to wheels (W) and a driving force of the rotating electric machine (MG2). And a drive transmission mechanism (2) for transmitting the oil to the oil pump (OP1). The oil pump (OP1) is driven by rotation of the drive transmission mechanism (2).

  According to this configuration, the oil pump (OP1) is always driven while the vehicle is traveling, regardless of the traveling mode executed in the vehicle equipped with the vehicle drive device (1). Becomes possible. Therefore, regardless of the traveling mode, oil is supplied to the first oil passage (91) and the second oil passage (92) to cool the stator (21) and the rotor (24) of the rotating electric machine (MG2). It becomes possible.

  Here, it is preferable that the rotating electric machine (MG2) is disposed so as to overlap with the drive transmission mechanism (2) when viewed in the axial direction (L) along the axial direction (L).

  When the rotating electric machine (MG2) is disposed so as to overlap with the drive transmission mechanism (2) in the axial direction (L) as described above, the vehicle driving device (1) is provided at a portion where the rotating electric machine (MG2) is disposed. Becomes easy to increase in the axial direction (L). In this regard, in the technology according to the present disclosure, by providing the third oil passage (93) along the first wall portion (31), the vehicle drive device (1) in the portion where the rotating electric machine (MG2) is arranged is provided. ) Can be suppressed from increasing in size in the axial direction (L), and therefore the present disclosure is applied to a case where the rotating electric machine (MG2) is arranged to overlap the drive transmission mechanism (2) in the axial direction (L). Technology is easy to apply.

  In the configuration in which the rotating electric machine (MG2) is disposed so as to overlap with the drive transmitting mechanism (2) as viewed in the axial direction (L) as described above, the drive transmitting mechanism (2) includes the rotating electric machine (MG). MG2) is preferably arranged on the side opposite to the first axial direction side (L1) in the axial direction (L).

  According to this configuration, since the drive transmission mechanism (2) can be disposed at a position that has little effect on the configuration of the third oil passage (93), the third oil passage (93) is connected to the first wall portion ( 31).

  The cooling structure of the rotating electric machine and the vehicle drive device according to the present disclosure may be able to exhibit at least one of the effects described above.

1: vehicle drive device 2: drive transmission mechanism 4: output member 21: second stator (stator)
24: 2nd rotor (rotor)
26: 2nd rotor shaft (rotor shaft)
30: case 31: first wall 32: second wall 43: third oil flow pipe (tubular member)
52a: first discharge port (discharge port)
90: supply oil passage 90a: connection portion 91: first oil passage 91a: first supplied portion (supplied portion)
91b: 1st discharge hole (discharge hole)
91c: discharge part 92: second oil passage 93: third oil passage 94: fourth oil passage (cooling oil passage)
L: axial direction L1: axial direction first side L2: axial direction second side MG1: first rotating electrical machine MG2: second rotating electrical machine (rotating electrical machine)
OC: Oil cooler OP1: First oil pump (oil pump)
V: Vertical direction W: Wheel

Claims (9)

A cooling structure for a rotating electric machine housed in a case,
An oil pump,
A supply oil passage connected to a discharge port of the oil pump,
An oil passage disposed vertically above the stator of the rotating electric machine, a supplied portion connected to the supply oil passage, and one side of the rotating electric machine in the axial direction relative to the supplied portion. A first oil passage having a discharge hole formed on the first axial side to discharge oil toward the stator, and a discharge portion formed on the first axial side with respect to the discharge hole. When,
A second oil passage formed inside a rotor shaft to which a rotor of the rotating electric machine is fixed,
A third oil passage connecting the discharge portion of the first oil passage and the second oil passage,
The cooling structure for a rotating electric machine, wherein the third oil passage is provided along a first wall portion disposed on the first axial side with respect to the rotating electric machine in the case. A side opposite to the first side in the axial direction is defined as a second side in the axial direction,
The end of the rotor shaft on the second side in the axial direction is disposed on the second side in the axial direction relative to the second wall portion disposed on the second side in the axial direction with respect to the rotating electric machine in the case. The rotating electrical machine cooling structure according to claim 1, wherein A side opposite to the first side in the axial direction is defined as a second side in the axial direction,
A connection portion that is a portion of the supply oil passage that is connected to the supply target portion is provided along a second wall portion disposed on the second axial side with respect to the rotary electric machine in the case. The cooling structure for a rotating electric machine according to claim 1 or 2.   The cooling structure for a rotating electrical machine according to any one of claims 1 to 3, wherein the supply oil passage is formed using a tubular member. A first rotating electric machine and a second rotating electric machine that is the rotating electric machine are housed in the case,
An oil cooler provided in the supply oil passage,
The cooling oil passage, which is an oil passage branched from a portion of the supply oil passage downstream of the oil cooler and through which oil for cooling the first rotary electric machine flows, is further provided. The cooling structure for a rotating electric machine according to any one of the above.   The cooling structure for a rotating electric machine according to any one of claims 1 to 5, wherein the oil pump is arranged on a separate shaft from the rotating electric machine. A rotating electrical machine cooling structure according to any one of claims 1 to 6,
An output member that is drivingly connected to the wheel;
A drive transmission mechanism for transmitting the driving force of the rotating electric machine to the output member,
The vehicle drive device, wherein the oil pump is driven by rotation of the drive transmission mechanism.   The vehicle drive device according to claim 7, wherein the rotating electric machine is arranged so as to overlap with the drive transmission mechanism when viewed in an axial direction along the axial direction.   The vehicle drive device according to claim 8, wherein the drive transmission mechanism is disposed on a side of the rotary electric machine opposite to the first axial side in the axial direction.

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