Drive device and vehicle

Abstract

To provide a drive device in which an oil passage of oil is arranged in a compact manner.SOLUTION: A gear portion 3 of a drive device 1 is connected to a motor shaft 22. An oil passage through which oil to cool a motor 2 flows includes a first oil passage 551, a second oil passage 552, a third oil passage 553, and a fourth oil passage 554. The first oil passage 551 connects a gear accommodation portion 62 and a pump accommodation portion 64. The second oil passage 552 connects the pump accommodation portion 64 and an oil cooler 8. The third oil passage 553 connects the oil cooler 8 and the fourth oil passage 554. The fourth oil passage 554 connects the third oil passage 553 and a motor accommodation portion 61. Each of the first oil passage 551, the second oil passage 552, and the third oil passage 553 is formed in a first housing member 51. The fourth oil passage 554 is formed in a third housing member 53.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drive device and a vehicle. [Background technology]

[0002] Conventionally, electric motors mounted on vehicles and the like are cooled by supplying a refrigerant such as cooled oil. For example, the refrigerant is supplied from a pump disposed outside the electric motor (see JP 2016-073163 A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-073163 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if piping through which the refrigerant flows is arranged outside the housing of the electric motor, the drive unit becomes larger, which may make it difficult to arrange the drive unit inside the vehicle.

[0005] An object of the present invention is to provide a drive device in which oil passages are arranged compactly. [Means for solving the problem]

[0006] An exemplary drive device of the present invention includes a motor, a gear unit, a housing, a pump, and an oil cooler. The motor includes a rotor having a motor shaft, and a stator located radially outward from the rotor. The motor shaft is rotatable about a rotation axis extending along a horizontal direction. The gear unit is connected to one axial end of the motor shaft. The housing accommodates the motor and the gear unit. The pump supplies oil accommodated in the housing to the motor. The oil cooler cools the oil. The housing includes a first housing member, a second housing member, a third housing member, a motor accommodating portion, a gear accommodating portion, a side plate opening, and an oil passage. The first housing member includes a cylindrical portion extending in an axial direction parallel to the rotation axis, a side plate portion covering one axial end of the cylindrical portion, and a pump accommodating portion accommodating the pump. The second housing member is attached to one axial end of the side plate portion. The third housing member closes the other axial end of the cylindrical portion. The motor accommodating portion is a space surrounded by the cylindrical portion, the side plate portion, and the third housing member, and accommodates the motor. The gear accommodating portion is a space surrounded by the side plate portion and the second housing member, and accommodates the gear portion. The side plate opening penetrates the side plate portion in the axial direction and connects the motor accommodating portion and the gear accommodating portion. The oil flows through the oil passage. The oil passage includes a first oil passage, a second oil passage, a third oil passage, and a fourth oil passage. The first oil passage connects the gear accommodating portion and the pump accommodating portion. The second oil passage connects the pump accommodating portion and the oil cooler. The third oil passage connects the oil cooler and the fourth oil passage. The fourth oil passage connects the third oil passage and the motor accommodating portion. The first oil passage, the second oil passage and the third oil passage are each formed in the first housing member, and the fourth oil passage is formed in the third housing member.

[0007] An exemplary vehicle of the present invention includes the drive device described above. Effect of the Invention

[0008] According to the exemplary drive unit and vehicle of the present invention, it is possible to provide a drive unit in which oil passages are arranged in a compact manner. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of the drive device as viewed from the vertical direction. [Diagram 2] FIG. 2 is a schematic configuration diagram of the drive device as viewed from the X-axis direction. [Diagram 3] FIG. 3 is a schematic configuration diagram of the drive device as viewed from the Y-axis direction. [Figure 4] FIG. 4 is a perspective view of the drive unit. [Diagram 5] FIG. 5 is a perspective view showing a configuration example of a rotor core. [Figure 6] FIG. 6 is a top view of the inverter accommodating section as viewed vertically downward from above. [Figure 7] FIG. 7 is an exploded perspective view of the housing. [Figure 8] FIG. 8 is a schematic diagram showing an example of a vehicle having a drive device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Exemplary embodiments are described below with reference to the drawings.

[0011] In the following description, the direction of gravity is defined based on the positional relationship when the drive unit 1 is mounted on a vehicle located on a horizontal road surface. In addition, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z axis direction indicates the vertical direction (i.e., the up-down direction). The +Z direction is upward (vertical upward in the opposite direction to the direction of gravity), and the -Z direction is downward (vertical downward in the same direction as the direction of gravity). Note that the "vertical direction" in the following description is an example of the "second direction" of the present invention. Also, the "vertical upward" in the following description is an example of the "second direction one side" of the present invention, and the "vertical downward" in the following description is an example of the "second direction other side" of the present invention. In each component, the end at the upper side is called the "upper end", and the position of the upper end in the axial direction is called the "upper end". Furthermore, the end at the lower side is called the "lower end", and the position of the lower end in the axial direction is called the "lower end". Moreover, among the surfaces of each component, the surface facing upward is called the "upper surface" and the surface facing downward is called the "lower surface."

[0012] The X-axis direction is perpendicular to the Z-axis direction and indicates the front-rear direction of the vehicle on which the drive unit 1 is mounted. Note that the "front-rear direction" in the following description is an example of the "third direction" of the present invention. The +X direction is the front of the vehicle, and the -X direction is the rear of the vehicle. However, it is also possible that the +X direction is the rear of the vehicle and the -X direction is the front of the vehicle.

[0013] The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle, with the +Y direction being the left side of the vehicle and the -Y direction being the right side of the vehicle. However, when the +X direction is the rear of the vehicle, the +Y direction may be the right side of the vehicle and the -Y direction may be the left side of the vehicle. That is, regardless of the X-axis direction, the +Y direction is simply one side of the left-right direction of the vehicle, and the -Y direction is the other side of the left-right direction of the vehicle. Also, depending on the method of mounting the drive unit 1 on the vehicle, the X-axis direction may be the width direction (left-right direction) of the vehicle, and the Y-axis direction may be the front-rear direction of the vehicle. In the following embodiment, the Y-axis direction is, for example, parallel to the rotation axis J2 of the motor 2. Therefore, the Y-axis direction may be simply referred to as the "axial direction". The "Y-axis direction" in this embodiment is an example of the "axial direction" in the present invention.

[0014] In the following description, unless otherwise specified, a direction parallel to a specific axis such as the rotation axis J2 of the motor 2 (Y-axis direction) may be simply referred to as the "axial direction". A direction perpendicular to the specific axis is simply referred to as the "radial direction", and a circumferential direction centered on the specific axis is referred to as the "circumferential direction". Within the radial direction, a direction approaching the axis is referred to as the "radial inner direction", and a direction away from the axis is referred to as the "radial outer direction". The end portion on the radial inner side of each component is referred to as the "radial inner end portion". Furthermore, the end portion on the outer side is referred to as the "radial outer end portion". Furthermore, among the side surfaces of each component, a side surface facing radially inward is referred to as the "radial inner side surface", and a side surface facing radially outward is referred to as the "radial outer side surface".

[0015] For each component, the end in the circumferential direction is referred to as the "circumferential end." Additionally, the end in one circumferential direction is referred to as the "one circumferential end." Furthermore, the end in the other circumferential direction is referred to as the "other circumferential end." Additionally, for the side surfaces of each component, the side surface facing the circumferential direction is referred to as the "circumferential side surface." Furthermore, the side surface facing one circumferential direction is referred to as the "one circumferential side surface," and the side surface facing the other circumferential direction is referred to as the "other circumferential side surface."

[0016] In addition, in the positional relationship between any one of a direction, a line, and a plane and any other, "parallel" includes not only a state in which the two do not intersect at all no matter how far they are extended, but also a state in which they are substantially parallel. Furthermore, "perpendicular" and "orthogonal" each include not only a state in which the two intersect at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal, respectively. In other words, "parallel," "perpendicular," and "orthogonal" each include a state in which there is an angle deviation in the positional relationship between the two to an extent that does not deviate from the gist of the present invention.

[0017] Note that these are names used merely for the purpose of explanation, and are not intended to limit the actual positional relationships, directions, names, and the like.

[0018] <1. Drive unit 1> Hereinafter, a driving device 1 according to an exemplary embodiment of the present invention will be described with reference to the drawings. Figs. 1 to 3 are conceptual diagrams of the driving device 1 according to the embodiment. Fig. 1 is a schematic diagram of the driving device 1 as viewed from the vertical direction. Fig. 2 is a schematic diagram of the driving device 1 as viewed from the X-axis direction. Fig. 3 is a schematic diagram of the driving device 1 as viewed from the Y-axis direction. Fig. 4 is a perspective view of the driving device 1. Note that Figs. 1 to 3 are merely conceptual diagrams, and the arrangement and dimensions of each part are not necessarily the same as those of the actual driving device 1.

[0019] In this embodiment, the drive unit 1 is mounted on a vehicle. The vehicle may be a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), or the like, and has at least a motor as a power source. The drive unit 1 is used as a power source for the above-mentioned vehicles.

[0020] As shown in FIG. 1, the drive device 1 includes a motor 2, a gear unit 3, a pump 4, a housing 5, and an oil cooler 8. The motor 2 includes a rotor 21 having a motor shaft 22, and a stator 25 located radially outward from the rotor 21. The motor shaft 22 is rotatable about a rotation axis J2 extending along the axial direction. The gear unit 3 is connected to one axial end (the end on the +Y side) of the motor shaft 22. The housing 5 accommodates the motor 2 and the gear unit 3. The pump 4 supplies the oil CL accommodated in the housing 5 to the motor 2. The oil cooler 8 cools the oil CL. In this embodiment, the oil cooler 8 cools the oil CL supplied from the pump 4 to the motor 2. The drive device 1 further includes an inverter unit 7. The inverter unit 7 supplies driving power to the motor 2. The housing 5 further accommodates the inverter unit 7.

[0021] An accommodating space is provided inside the housing 5 to accommodate the motor 2, the gear unit 3, the pump 4, and the inverter unit 7. As described below, this accommodating space is partitioned into a motor accommodating section 61 that accommodates the motor 2, a gear accommodating section 62 that accommodates the gear unit 3, an inverter accommodating section 63 that accommodates the inverter unit 7, and a pump accommodating section 64 that accommodates the pump 4. The inverter unit 7 is fixed integrally to a fourth housing member 54 that will be described below.

[0022] <1-1.Motor 2> The motor 2 is accommodated in a motor accommodating portion 61 of the housing 5. The motor 2 includes a rotor 21 and a stator 25.

[0023] <1-1-1.Rotor 21> The rotor 21 rotates about a rotation axis J2 extending in the horizontal direction as a result of power being supplied from a battery (not shown) to the stator 25. The rotor 21 has a motor shaft 22, a rotor core 23, and a rotor magnet 24. The rotor core 23 is fixed to the radially outer surface of the motor shaft 22.

[0024] The motor shaft 22 extends about a rotation axis J2 that extends in the Y-axis direction. The motor shaft 22 rotates about the rotation axis J2. The motor shaft 22 is rotatably supported by a first motor bearing 281 and a second motor bearing 282. The first motor bearing 281 is held by a third housing member 53 of the housing 5, which will be described later. The second motor bearing 282 is held by a side plate portion 512 of the housing 5, which will be described later.

[0025] The motor shaft 22 is a cylindrical hollow shaft. The motor shaft 22 has a hollow portion 220, a shaft tube portion 221 extending in the axial direction, and a shaft hole portion 222. The hollow portion 220 is disposed inside the shaft tube portion 221. The shaft hole portion 222 penetrates the shaft tube portion 221 in the radial direction. The motor shaft 22 further has a recess 223. The recess 223 is disposed on the inner peripheral surface of the shaft tube portion 221 at the center of the shaft tube portion 221, recessed radially outward from the inner peripheral surface, and extending in the circumferential direction. The shaft hole portion 222 is disposed on the bottom surface of the recess 223, and penetrates the shaft tube portion 221 radially outward from the bottom surface of the recess 223.

[0026] A hollow transmission shaft 310 (described later) of the gear unit 3 is inserted and connected to one end (+Y side) of the motor shaft 22. A screw coupling using male and female threads can be used to connect the two. Alternatively, the two may be joined by a fixing method such as welding. The hollow portion 220 of the motor shaft 22 communicates with a hollow portion 310a (described later) of the transmission shaft 310 and a first motor bearing holder 531 that houses the first motor bearing 281.

[0027] The rotor core 23 is a cylindrical body extending along the axial direction. The rotor core 23 is fixed to the radially outer surface of the motor shaft 22. As described above, the rotor 21 has the rotor core 23. In addition, a plurality of rotor magnets 24 are fixed to the rotor core 23. The plurality of rotor magnets 24 are arranged along the circumferential direction with their magnetic poles alternating.

[0028] The rotor core 23 also has a rotor through hole 230 and a rotor space 2334. The rotor through hole 230 penetrates the rotor core 23 in the axial direction (i.e., the Y-axis direction). The rotor space 2334 connects the rotor through hole 230 and the shaft hole portion 222 of the motor shaft 22. The rotor through hole 230 is used as a flow path for oil CL that cools the rotor 21 from the inside. The oil CL flowing through the hollow portion 220 of the motor shaft 22 can flow into the rotor through hole 230 via the shaft hole portion 222 and the rotor space 2334, as described below.

[0029] FIG. 5 is a perspective view showing a configuration example of the rotor core 23. The rotor core 23 has a first rotor core 231, a second rotor core 232, and an intermediate core 233. The first rotor core 231 has a first rotor through hole 2310 extending in the axial direction. The second rotor core 232 has a second rotor through hole 2320 extending in the axial direction. The intermediate core 233 is disposed between the first rotor core 231 and the second rotor core 232 in the axial direction. The first rotor core 231 and the second rotor core 232 are laminated bodies formed by laminating silicon steel plates. The intermediate core 233 is a silicon steel plate laminated between the first rotor core 231 and the second rotor core 232.

[0030] The intermediate core 233 has a first annular portion 2331, a second annular portion 2332, and a core opening 2333. The first annular portion 2331 is disposed radially outward from the motor shaft 22. The second annular portion 2332 extends radially outward from a radially outer end portion of the first annular portion 2331. The core opening 2333 penetrates the first annular portion 2331 in the axial direction. In this embodiment, a plurality of core openings 2333 are disposed in the circumferential direction along a radially inner end portion of the first annular portion 2331.

[0031] In the axial direction, the thickness of the second annular portion 2332 is thicker than the thickness of the first annular portion 2331. Therefore, in this embodiment, the rotor space 2334 is disposed between the first annular portion 2331 and the first rotor core 231. However, without being limited to this example, the rotor space 2334 may be disposed between the first annular portion 2331 and the second rotor core 232, or may be disposed both between the first annular portion 2331 and the first rotor core 231 and between the first annular portion 2331 and the second rotor core 232. In other words, the rotor space 2334 is disposed between the first annular portion 2331 and at least one of the first rotor core 231 and the second rotor core 232.

[0032] The rotor through hole 230 includes a first rotor through hole 2310, a second rotor through hole 2320, and a core opening 2333. When viewed from the axial direction, the core opening 2333 overlaps with at least a portion of the first rotor through hole 2310 and at least a portion of the second rotor through hole 2320. In this way, by appropriately adjusting the overlapping area of ​​the core opening 2333 and the first rotor through hole 2310 when viewed from the axial direction and the overlapping area of ​​the core opening 2333 and the second rotor through hole 2320 when viewed from the axial direction, it is possible to adjust the supply amount of oil CL (see FIG. 1) supplied from the axial end of the rotor through hole 230 to the axial end of the stator 25 when the rotor 21 rotates. For example, by preventing an excessive amount of oil CL from being supplied to the axial end of the stator 25, it is possible to make it difficult for the oil CL to enter between the radial outer surface of the rotor 21 and the radial inner surface of the stator 25 from between the axial ends of the rotor 21 and the stator 25. Therefore, it is possible to suppress or prevent a decrease in the rotation efficiency of the rotor 21 due to the friction resistance of the oil CL that has entered between them.

[0033] <1-1-2. Stator 25> The stator 25 drives the rotor 21 to rotate. The stator 25 is disposed radially outward from the rotor 21 and surrounds the rotor 21 from the radially outward direction. In other words, the motor 2 is an inner rotor type motor in which the rotor 21 is rotatably disposed inside the stator 25. The stator 25 has a stator core 26, a coil 27, and an insulator (not shown) interposed between the stator core 26 and the coil 27. The stator 25 is held by the housing 5. The stator core 26 has a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumferential surface of the annular yoke.

[0034] A coil wire is wound between the magnetic pole teeth. On teeth The wound coil wire constitutes the coil 27. The coil wire is connected to the inverter unit 7 via a bus bar (not shown). The coil 27 has a coil end 271 that protrudes from the axial end face of the stator core 26. The coil end 271 protrudes in the axial direction beyond the end of the rotor core 23 of the rotor 21.

[0035] <1-2. Gear section 3> Next, the gear unit 3 transmits the driving force of the motor 2 to a drive shaft Ds of the vehicle. The drive shaft Ds drives the wheels of the vehicle. The details of the gear unit 3 will be described with reference to the drawings. As shown in FIG. 1 etc., the gear unit 3 is accommodated in a gear accommodating portion 62 of the housing 5. The gear unit 3 has a reduction gear 31 and a differential gear 32.

[0036] <1-2-1. Reduction device 31> The reduction gear 31 is connected to the motor shaft 22. The reduction gear 31 reduces the rotational speed of the motor 2, increases the torque output from the motor 2 in accordance with a reduction ratio, and transmits the increased torque to the differential gear 32.

[0037] The reduction gear 31 has a transmission shaft 310, a first gear (intermediate drive gear) 311, a second gear (intermediate gear) 312, a third gear (primary drive gear) 313, and an intermediate shaft 314. The torque output from the motor 2 is transmitted to a fourth gear 321 of the differential gear 32 via the motor shaft 22, the transmission shaft 310, the first gear 311, the second gear 312, the intermediate shaft 314, and the third gear 313. The gear ratio of each gear and the number of gears can be changed according to the required reduction ratio. The reduction gear 31 is a parallel shaft gear type reducer in which the axes of the gears are arranged in parallel. The motor shaft 22 and the transmission shaft 310 are spline-fitted.

[0038] The transmission shaft 310 extends in the Y-axis direction around the rotation axis J2, and rotates together with the motor shaft 22 around the rotation axis J2. The motor shaft 22 is rotatably supported by a first gear bearing 341 and a second gear bearing 342. The first gear bearing 341 is held by a side plate portion 512 of the housing 5, as described below. The second gear bearing 342 is held by a second housing member 52, which will be described below.

[0039] The transmission shaft 310 is a hollow shaft provided with a hollow portion 310a having an inner circumferential surface extending along the rotation axis J2. As described above, the end of the transmission shaft 310 on the -Y direction side is connected to the end of the motor shaft 22 on the +Y direction side. It should be noted that the present embodiment is not limited to the example, and the transmission shaft 310 may be the same member as the motor shaft 22, that is, may be integral with the motor shaft 22. In other words, the motor shaft 22 may be a hollow shaft extending across the motor accommodating portion 61 and the gear accommodating portion 62 of the housing 5. In this case, the end of the motor shaft 22 on the +Y direction side protrudes toward the gear accommodating portion 62 side and is rotatably supported by the second gear bearing 342. The hollow portion 220 of the motor shaft 22 communicates with the first motor bearing holding portion 531 that houses the first motor bearing 281 and the second gear bearing holding portion 521 that houses the second gear bearing 342.

[0040] The first gear 311 is provided on the outer circumferential surface of the transmission shaft 310. The first gear 311 may be the same member as the transmission shaft 310, or may be a different member. When the first gear 311 and the transmission shaft 310 are different members, the first gear 311 and the transmission shaft 310 are firmly fixed to each other by shrink fitting or the like. The first gear 311 is rotatable together with the transmission shaft 310 about the rotation axis J2.

[0041] The intermediate shaft 314 extends along an intermediate axis J4 parallel to the rotation axis J2, and is supported by the housing 5 so as to be rotatable about the intermediate axis J4. Both ends of the intermediate shaft 314 are rotatably supported by a third gear bearing 343 and a fourth gear bearing 344. The third gear bearing 343 is held by a side plate portion 512 of the housing 5. The fourth gear bearing 344 is held by the second housing member 52.

[0042] The second gear 312 and the third gear 313 are provided on the outer circumferential surface of the intermediate shaft 314. The second gear 312 and the third gear 313 may be the same member as the intermediate shaft 314, or may be different members. When the second gear 312 and the intermediate shaft 314 are different members, the two are firmly fixed to each other by shrink fitting or the like. When the third gear 313 and the intermediate shaft 314 are different members, the two are firmly fixed to each other by shrink fitting or the like. The third gear 313 is disposed closer to the side plate portion 512 than the second gear 312 (i.e., in the -Y direction).

[0043] The second gear 312 and the third gear 313 are connected via an intermediate shaft 314. The second gear 312 and the third gear 313 are rotatable about an intermediate shaft J4. The second gear 312 meshes with the first gear 311. The third gear 313 meshes with a fourth gear 321 of the differential device 32.

[0044] The torque of the transmission shaft 310 is transmitted from the first gear 311 to the second gear 312. Then, the torque transmitted to the second gear 312 is transmitted to the third gear 313 via the intermediate shaft 314. Furthermore, the torque transmitted to the third gear 313 is transmitted to the fourth gear 321 of the differential device 32. In this manner, the reduction gear 31 transmits the torque output from the motor 2 to the differential device 32.

[0045] <1-2-2. Differential device 32> The differential gear 32 is attached to the drive shaft Ds. The differential gear 32 transmits the output torque of the motor 2 to the drive shaft Ds. The drive shafts Ds are attached to the left and right sides of the differential gear 32, respectively. The differential gear 32 has a function of transmitting the same torque to the left and right drive shafts Ds while absorbing the speed difference between the left and right wheels (drive shafts Ds) when the vehicle turns, for example. The differential gear 32 has, for example, a fourth gear (ring gear) 321, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

[0046] The fourth gear 321 is rotatable about a differential shaft J5 that is parallel to the rotation shaft J2. The torque output from the motor 2 is transmitted to the fourth gear 321 via the reduction gear 31.

[0047] <1-3. Pump 4 and oil cooler 8> Next, the pump 4 is an electric pump that is driven by electricity, and is connected to the inverter unit 7 via a harness cable (not shown). That is, the pump 4 is driven by the inverter unit 7. A trochoidal pump, a centrifugal pump, or the like can be adopted as the pump 4. The pump 4 is provided in a pump accommodating portion 64 formed in the housing 5. For example, the pump 4 is fixed to the housing 5 with bolts (not shown).

[0048] The suction port 41 of the pump 4 is inserted into the first oil passage 551 so as to block the first oil passage 551. The suction port 41 of the pump 4 is connected to the strainer 42 via the first oil passage 551, which will be described later. The strainer 42 is disposed in the gear accommodating portion 62 of the housing 5. The strainer 42 is located in an oil reservoir P (see FIG. 2, etc.), which will be described later, of the gear accommodating portion 62. The strainer 42 draws oil CL from an inlet (not shown) disposed on its lower surface when the pump 4 is driven, and supplies the oil to the suction port 41 of the pump 4. A filtering structure (not shown), such as a filter, is attached to the strainer 42. The attachment of the filtering structure can suppress the intrusion of foreign matter into the pump 4 and the motor 2.

[0049] The discharge port 43 of the pump 4 opens into the pump housing portion 64. That is, the oil CL protruded from the pump 4 fills the pump housing portion 64. A second oil passage 552, which will be described later, is connected to the pump housing portion 64. The pump 4 discharges the oil CL sucked from the suction port 41 from the discharge port 43, and sends it to the oil cooler 8 via the second oil passage 552.

[0050] The oil cooler 8 exchanges heat between the oil CL delivered from the pump 4 via the second oil passage 552 and the refrigerant RE supplied via a system separate from the oil passage 55 described below, which includes the second oil passage 552. Sending The oil CL cooled by the oil cooler 8 is supplied to the motor 2 via a third oil passage 553 and a fourth oil passage 554 (described later). The refrigerant RE cools the IGBT and SIC elements (not shown) of the inverter unit 7, and is then supplied to the oil cooler 8.

[0051] The pump accommodating portion 64 is formed in the peripheral wall portion 514 that surrounds the inverter accommodating portion 63 (see FIG. 6). For example, the pump accommodating portion 64 can be arranged by utilizing dead space in the inverter accommodating portion 63 other than the space occupied by the inverter unit 7. In this way, the pump 4 can be arranged compactly, which contributes to the miniaturization of the drive device 1.

[0052] Also, preferably, the pump 4 is disposed between the fourth housing member 54 and the drive shaft Ds. For example, in the vertical direction, the pump 4 is disposed closer to the drive shaft Ds in the vertical direction than the fourth housing member 54 (i.e., vertically downward) and closer to the fourth housing member 54 in the vertical direction than the drive shaft Ds (i.e., vertically upward). In this way, the pump 4 can be disposed in the empty space between the drive shaft Ds and the fourth housing member 54 in the vertical direction. This contributes to the miniaturization of the drive unit 1 in the vertical direction. Furthermore, there is no interference with the mounting portion 510 for mounting to the vehicle provided on the first housing member 51.

[0053] In addition, in the front-rear direction (i.e., the X-axis direction) perpendicular to the axial direction, the pump 4 and the oil cooler 8 are disposed at one end of the housing 5 in the front-rear direction. The motor housing 61 is disposed at the other part of the housing 5 in the front-rear direction. For example, in this embodiment, the pump 4 and the oil cooler 8 are disposed at the rear end of the housing 5 (i.e., the end on the -X direction side), and the motor housing 61 is disposed at the front part of the housing 5 (i.e., the +X direction side). In this way, since the pump 4 and the oil cooler 8 are disposed at the end in the front-rear direction, it is possible to suppress an increase in the size of the drive device 1 in the axial direction. In addition, since the pump 4 and the oil cooler 8 are provided on the opposite side of the motor housing 61 of the housing 5 in the front-rear direction, the pump 4 and the oil cooler 8 can be disposed away from the motor housing 61. Therefore, the pump 4 and the oil cooler 8 can be disposed without increasing the size of the drive device 1 in the front-rear direction too much. Furthermore, oil passages and the like can be disposed relatively freely between the pump 4 and the oil cooler 8 and the motor housing 61.

[0054] <1-4. Housing 5> Next, the configuration of the housing 5 will be described. FIG. 7 is an exploded view of the housing 5. As shown in FIG. 7, the housing 5 has a first housing member 51, a second housing member 52, and a third housing member 53. The first housing member 51 has a cylindrical tube portion 511 extending in an axial direction parallel to the rotation axis J2, a side plate portion 512 covering one axial end of the tube portion 511, and a pump accommodating portion 64 accommodating the pump 4. The second housing member 52 has one axial end (the +Y direction side) of the side plate portion 512. end The third housing member 53 is attached to the other axial end (the end on the -Y direction side) of the cylindrical portion 511. In other words, the third housing member 53 is disposed at the other axial end (the end on the -Y direction side) of the first housing member 51. That is, the third housing member 53 closes the opening of the cylindrical first housing member 51. The housing 5 further has a fourth housing member 54. The fourth housing member 54 is disposed vertically above the cylindrical portion 511. Note that the vertically above is perpendicular to the axial direction. The fourth housing member 54 is attached to the upper part of the first housing member 51.

[0055] The housing 5 further has a motor accommodating portion 61 and a gear accommodating portion 62. The motor accommodating portion 61 is a space surrounded by the cylindrical portion 511, the side plate portion 512, and the third housing member 53, and accommodates the motor 2. The gear accommodating portion 62 is a space surrounded by the side plate portion 512 and the second housing member 52, and accommodates the gear portion 3. The motor accommodating portion 61 and the gear accommodating portion 62 are partitioned by the side plate portion 512.

[0056] The housing 5 further has an inverter accommodating portion 63 that accommodates the inverter unit 7. The inverter accommodating portion 63 is a space surrounded by the cylindrical portion 511, a plate portion 513 described later, a peripheral wall portion 514 described later, and the fourth housing member 54. The inverter unit 7 is fixed integrally to the fourth housing member 54. That is, the inverter unit 7 is fixed downward to the inverter accommodating portion 63 by being fixed integrally to the lower side of the fourth housing member 54. The fourth housing member 54 may be provided with an inverter cooling passage (not shown).

[0057] Moreover, the housing 5 further has a pump accommodating portion 64 that accommodates the pump 4. The pump accommodating portion 64 is formed in the first housing member 51. That is, the first housing member 51 has the pump accommodating portion 64.

[0058] The cylindrical portion 511 has a cylindrical shape extending in the axial direction. The motor 2 is accommodated inside the cylindrical portion 511. That is, the space inside the cylindrical portion 511 configures the motor accommodating portion 61. In this embodiment, the cylindrical portion 511 and the side plate portion 512 are the same member. However, this is not limiting, and the cylindrical portion 511 and the side plate portion 512 may be different members.

[0059] The first housing member 51 further has a plate portion 513 and a peripheral wall portion 514 surrounding the inverter accommodating portion 63. The plate portion 513 extends from the tube portion 511 along one of the left-right directions (+Y direction). The left-right direction is perpendicular to the axial direction and intersects with the vertical direction. The peripheral wall portion 514 protrudes upward (+Z direction) from the upper end of the tube portion 511 and the plate portion 513, and surrounds the inverter accommodating portion 63 when viewed from the vertical direction (see FIG. 6).

[0060] The first housing member 51 further has an insertion hole 5120, a first drive shaft passing hole 515, a second motor bearing retaining portion 516, a first gear bearing retaining portion 517, a third gear bearing retaining portion 518, and a side plate opening 519.

[0061] The insertion hole 5120 and the first drive shaft passing hole 515 are disposed in the side plate portion 512 and penetrate the side plate portion 512 in the Y-axis direction. The center of the insertion hole 5120 coincides with the rotation axis J2. The second motor bearing holder 516 is disposed in the insertion hole 5120.

[0062] The drive shaft Ds rotatably passes through the first drive shaft passing hole 515. The second housing member 52 is provided with a second drive shaft passing hole 523. The second drive shaft passing hole 523 is a hole that passes through the second housing member 52 in the axial direction. The drive shaft Ds rotatably passes through the second drive shaft passing hole 523. The second drive shaft passing hole 523 overlaps with the first drive shaft passing hole 515 when viewed from the axial direction. As a result, the drive shafts Ds disposed at both ends of the differential device 32 in the axial direction (Y direction) rotate around the differential axis J5. Between the drive shaft Ds and the first drive shaft passing hole 515 and between the drive shaft Ds and the second drive shaft passing hole 523, oil seals (not shown) are provided to suppress leakage of oil CL. An axle (not shown) that rotates the wheels is connected to the tip of the drive shaft Ds.

[0063] The second motor bearing holder 516 extends in the -Y direction from the edge of the insertion hole 5120. The outer ring of the second motor bearing 282 is fixed to the second motor bearing holder 516. The end of the motor shaft 22 on the +Y direction side is fixed to the inner ring of the second motor bearing 282. The first motor bearing holder 531 is disposed on the +Y direction side of the third housing member 53. The central axes of the first motor bearing holder 531 and the second motor bearing holder 516 respectively coincide with the rotation axis J2. The outer ring of the first motor bearing 281 is fixed to the first motor bearing holder 531. The end of the motor shaft 22 on the -Y direction side is fixed to the inner ring of the first motor bearing 281. As a result, the motor 2 is rotatably supported by the housing 5 via the first motor bearing 281 and the second motor bearing 282 at both ends of the rotor 21 in the Y axis direction.

[0064] The first gear bearing holding portion 517 extends in the +Y direction from the edge of the insertion hole 5120. The outer ring of the first gear bearing 341 is fixed to the first gear bearing holding portion 517. The end of the transmission shaft 310 on the -Y direction side is fixed to the inner ring of the first gear bearing 341. The second gear bearing holding portion 521 is disposed on the -Y direction side of the second housing member 52. The central axes of the second gear bearing holding portion 521 and the first gear bearing holding portion 517 coincide with the rotation axis J2. The outer ring of the second gear bearing 342 is fixed to the second gear bearing holding portion 521. The transmission shaft 310 is fixed to the inner ring of the second gear bearing 342. As a result, the transmission shaft 310 is rotatably supported by the side plate portion 512 of the housing 5 and the second housing member 52 via the first gear bearing 341 and the second gear bearing 342.

[0065] Next, the third gear bearing holding portion 518 is cylindrical and extends in the +Y direction from the side plate portion 512. The third gear bearing holding portion 518 is disposed in the +X direction and the +Z direction from the first gear bearing holding portion 517. The outer ring of the third gear bearing 343 is fixed to the third gear bearing holding portion 518. The intermediate shaft 314 is fixed to the inner ring of the third gear bearing 343. The fourth gear bearing holding portion 522 is disposed on the +Y direction side of the second housing member 52. The fourth gear bearing holding portion 522 is cylindrical and extends in the -Y direction from the second housing member 52. The central axes of the third gear bearing holding portion 518 and the fourth gear bearing holding portion 522 coincide with the intermediate axis J4. The outer ring of the fourth gear bearing 344 is fixed to the fourth gear bearing holding portion 522. Further, an end portion of the intermediate shaft 314 on the +Y direction side is fixed to the inner ring of the fourth gear bearing 344. As a result, the intermediate shaft 314 is rotatably supported by the side plate portion 512 of the housing 5 and the second housing member 52 via the third gear bearing 343 and the fourth gear bearing 344.

[0066] The side plate opening 519 is disposed in the side plate portion 512 that separates the motor accommodating portion 61 and the gear accommodating portion 62. The housing 5 includes the side plate opening 519. The side plate opening 519 axially penetrates the side plate portion 512 and connects the motor accommodating portion 61 and the gear accommodating portion 62. The side plate opening 519 in particular communicates between the lower portion of the motor accommodating portion 61 and the lower portion of the gear accommodating portion 62. The side plate opening 519 allows the oil CL accumulated in the lower portion of the motor accommodating portion 61 to move to the gear accommodating portion 62. The oil CL that has moved to the gear accommodating portion 62 can flow into the oil reservoir P.

[0067] Next, the configuration of the second housing member 52 will be described. The second housing member 52 is attached to the +Y direction side of the side plate portion 512 of the first housing member 51. The second housing member 52 has a concave shape that opens towards the side plate portion 512. The opening of the second housing member 52 is covered by the side plate portion 512. As shown in FIG. 1 etc., the second housing member 52 has a second gear bearing holding portion 521, a fourth gear bearing holding portion 522, and a second drive shaft passing hole 523. Note that these have been described above and will not be described here.

[0068] The second housing member 52 may have an oil reservoir (not shown) for storing oil CL. The oil CL is supplied to the second gear bearing holding portion 521 and the fourth gear bearing holding portion 522 from the oil reservoir (not shown), and the second gear bearing 342 held by the second gear bearing holding portion 521 and the fourth gear bearing 344 held by the fourth gear bearing holding portion 522 are lubricated with the oil CL.

[0069] An oil sump P in which oil CL accumulates is disposed in the lower portion of the gear accommodating portion 62. A part of the differential gear 32 is immersed in the oil sump P. The oil CL accumulated in the oil sump P is scooped up by the operation of the differential gear 32 and supplied to the inside of the gear accommodating portion 62. For example, the oil CL is scooped up by the tooth surface of the fourth gear 321 when the fourth gear 321 of the differential gear 32 rotates. The oil CL diffused in the gear accommodating portion 62 is supplied to each gear of the reduction gear 31 and the differential gear 32 in the gear accommodating portion 62, and the oil CL is spread over the tooth surfaces of the gears, and is used for lubrication. In addition, a part of the oil CL diffused in the gear accommodating portion 62 is supplied to each of the first gear bearing 341 to the fourth gear bearing 344, and is used for lubrication.

[0070] <1-5.Oil road> 1 to 3, the housing 5 further has an oil passage 55 through which the oil CL flows. The oil passage 55 is a flow path through which the oil CL, which has been sucked up from the oil reservoir P in the gear accommodating portion 62 by the pump 4 and cooled by the oil cooler 8, flows toward the motor 2.

[0071] The oil passage 55 includes a first oil passage 551, a second oil passage 552, a third oil passage 553, and a fourth oil passage 554. The first oil passage 551 connects the gear housing 62 and the pump housing 64. In detail, as described above, the first oil passage 551 connects the gear housing 62 and the suction port 41 of the pump 4, and in particular, connects the vertical lower portion of the gear housing 62 and the suction port 41 of the pump 4. For example, in this embodiment, the first oil passage 551 is directly connected to the suction port 41 of the pump 4, but is not limited to this example, and the first oil passage 551 may be indirectly connected to the suction port 41 via a predetermined space such as a part of the pump housing 64. The first oil passage 551 connects the pump housing 64 and the oil cooler 8. In detail, the second oil passage 552 connects the discharge port 43 of the pump 4 and the oil cooler 8, and supplies the oil CL discharged from the pump 4 to the oil cooler 8. For example, in this embodiment, the first oil passage 551 is indirectly connected to the discharge port 43 via another part of the pump accommodating portion 64. However, this is not limited to the example, and the first oil passage 551 may be directly connected to the discharge port 43 of the pump 4. The third oil passage 553 connects the oil cooler 8 and the fourth oil passage 554. The fourth oil passage 554 is formed in the third housing member 53. The fourth oil passage 554 connects the third oil passage 553 and the motor accommodating portion 61.

[0072] The first oil passage 551, the second oil passage 552, and the third oil passage 553 are formed in the first housing member 51. For example, in this embodiment, the first oil passage 551 is formed inside the side plate portion 512, that is, the first oil passage 551 is formed in a different position of the same member as the side plate portion 512. The second oil passage 552 and the third oil passage 553 are formed inside the peripheral wall portion 514, that is, the second oil passage 552 and the third oil passage 553 are formed in a different position of the same member as the peripheral wall portion 514. The fourth oil passage 554 is formed in the third housing member 53. In this way, it is not necessary to arrange a pipe for flowing the oil CL outside the housing 5, so that the drive unit 1 can be prevented from becoming large. Therefore, it is possible to provide the drive unit 1 in which the oil passage 55 of the oil CL is arranged compactly. The first oil passage 551 to the fourth oil passage 554 are each drilled with a drill, an end mill, or the like.

[0073] Incidentally, without being limited to the example of this embodiment, the second oil passage 552 and the third oil passage 553 may be formed inside the plate portion 513. In other words, the second oil passage 552 and the third oil passage 553 may each be the same member as either the plate portion 513 or the peripheral wall portion 514. In this way, since the second oil passage 552 and the third oil passage 553 are not separate members from the first housing member 51, the number of parts of the drive device 1 can be reduced. Therefore, the drive device 1 becomes easier to assemble. Furthermore, the manufacturing cost of the drive device 1 can be reduced, thereby improving its productivity.

[0074] Preferably, the oil passage 55 further includes a connecting pipe 5530. The connecting pipe 5530 is disposed on an inner surface of one of the third oil passage 553 and the fourth oil passage 554 at a connection portion between the third oil passage 553 and the fourth oil passage 554, and is fitted into the other oil passage. By fitting the connecting pipe 5530 at the connection portion, the third oil passage 553 and the fourth oil passage 554 can be easily positioned when the third housing member 53 is attached to the first housing member 51. Furthermore, the connecting pipe 5530 covers the inside of the connection portion between the two, so that leakage of oil CL at the connection portion can be more reliably prevented.

[0075] For example, in the present embodiment, in the above-mentioned connection portion, one end of the connecting pipe 5530 is disposed on the inner surface of the third oil passage 553. The other end of the connecting pipe 5530 is fitted into the inner surface of the fourth oil passage 554. Moreover, the connecting pipe 5530 is the same member as the third oil passage 553. Alternatively, one end of the connecting pipe 5530 may be disposed on the inner surface of the fourth oil passage 554, and the other end may be fitted into the inner surface of the third oil passage 553. Moreover, the connecting pipe 5530 may be the same member as the fourth oil passage 554. However, without being limited to these examples, the connecting pipe 5530 may be a member different from the third oil passage 553 and the fourth oil passage 554.

[0076] Next, the fourth oil passage 554 is connected to the oil supply unit 558 and the hollow portion 220 of the motor shaft 22. The oil supply unit 558 is connected to the fourth oil passage 554 and supplies oil CL to the radial outer surface of the stator 25. The drive device 1 further includes an oil supply unit 558. Specifically, the oil supply unit 558 is a cylindrical member extending in the axial direction. The oil supply unit 558 is accommodated in the motor accommodating unit 61 together with the motor 2 and is disposed above the stator 25. The oil supply unit 558 has a plurality of diffusion holes 5580 penetrating the inner wall. Each diffusion hole 5580 opens toward the stator 25 and diffuses the oil CL supplied from the fourth oil passage 554 toward the stator 25. Therefore, the stator 25 can be cooled from its radial outer surface by the oil CL supplied from the oil supply unit 558.

[0077] On the other hand, the hollow portion 220 of the motor shaft 22 is connected to the rotor through hole 230 of the rotor core 23. For example, the hollow portion 220 of the motor shaft 22 is connected to the rotor through hole 230 via the recess 223, the shaft hole portion 222, and the rotor space 2334 (see FIG. 5). That is, the rotor through hole 230 is connected to the fourth oil passage 554 via the hollow portion 220. Therefore, when the rotor 21 rotates, the oil CL is supplied from the axial end of the rotor through hole 230 to the axial end of the stator 25. Therefore, the oil CL supplied from the rotor through hole 230 can cool the axial end of the stator 25, and in particular the coil end of the stator 25.

[0078] The fourth oil passage 554 has a first supply passage 555, a cylindrical second supply passage 556, and a cylindrical third supply passage 557. The first supply passage 555 is connected to the third oil passage 553. The second supply passage 556 connects the first supply passage 555 and the oil supply section 558. The third supply passage 557 connects the first supply passage 555 and the hollow section 220 of the motor shaft 22. That is, one end of the fourth oil passage 554 is the first supply passage 555, and the other end of the fourth oil passage 554 branches into the second supply passage 556 and the third supply passage 557. Preferably, the inner diameter of the second supply passage 556 is larger than the inner diameter of the third supply passage 557. In particular, the minimum inner diameter of the second supply passage 556 is larger than the minimum inner diameter of the third supply passage 557. In this way, the amount of oil CL supplied to the oil supply portion 558 is greater than the amount of oil CL supplied to the hollow portion 220 of the motor shaft 22. Ku Therefore, more oil CL can be supplied to the radial outer surface of the stator 25 than to the axial end portion of the stator 25, such as the coil end 271. Therefore, the efficiency of cooling the stator 25 by the oil CL cooled by the oil cooler 8 can be improved.

[0079] The oil CL that has cooled the motor 2 accumulates in the lower part of the motor accommodating portion 61, and then flows through the side plate opening 519 to the oil pool P in the lower part of the gear accommodating portion 62. That is, the oil CL that has been supplied from the second supply passage 556 through the oil supply portion 558 to the radial outer surface of the stator 25 and has cooled the stator 25 accumulates in the lower part of the motor accommodating portion 61, and then flows through the side plate opening 519 to the oil pool P in the lower part of the gear accommodating portion 62. The oil CL that has been supplied from the third supply passage 557 through the rotor through-hole 230 to the coil end 271, etc. accumulates in the lower part of the motor accommodating portion 61, and then flows through the side plate opening 519 to the oil pool P in the lower part of the gear accommodating portion 62.

[0080] More preferably, the inner diameter of second supply passage 556 is greater than 1.6 times the inner diameter of third supply passage 557. For example, in this embodiment, the inner diameter of second supply passage 556 is φ7 mm, and the inner diameter of third supply passage 557 is φ5.5 mm.

[0081] It should be noted that the above example does not exclude a configuration in which the inner diameter of second supply passage 556 is equal to or smaller than the inner diameter of third supply passage 557.

[0082] <2. Vehicle 200 having driving device 1> FIG. 8 is a schematic diagram showing an example of a vehicle 200 having a drive unit 1. Note that in FIG. 8, the drive unit 1 is conceptually illustrated. The vehicle 200 has the drive unit 1. In the example of the vehicle 200, the drive unit 1 drives the left and right front wheels. The vehicle 200 also has a battery 150. The battery 150 stores power to be supplied to the drive unit 1. Note that the drive unit 1 only needs to drive at least one of the wheels. Such a vehicle 200 can be equipped with the drive unit 1 in which the oil passage 55 for the oil CL is compactly arranged. This contributes to the miniaturization of the vehicle. Furthermore, since the drive unit 1 can be arranged in a space-saving manner, the interior space available to the vehicle passengers can be made larger.

[0083] <3.Other> The embodiments of the present invention have been described above. Note that the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by adding various modifications to the above-described embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above-described embodiments can be appropriately combined in any manner as long as no contradiction occurs. [Industrial Applicability]

[0084] The present invention is useful for drive motors for vehicles such as hybrid vehicles (HVs), plug-in hybrid vehicles (PHVs), and electric vehicles (EVs). [Explanation of symbols]

[0085] REFERENCE SIGNS LIST 1 Drive device, 2 Motor, 21 Rotor, 22 Motor shaft, 220 Hollow portion, 221 Shaft cylinder portion, 222 Shaft hole portion, 223 Recess, 23 Rotor core, 230 Rotor through hole, 231 First rotor core, 2310 First rotor through hole, 232 Second rotor core, 2320 Second rotor through hole, 233 Intermediate core, 2331 First annular portion, 2332 Second annular portion, 2333 Core opening, 2334 Rotor space, 24 Rotor magnet, 25 Spline stator, 26... stator core, 27... coil, 271... coil end, 281... first motor bearing, 282... second motor bearing, 3... gear portion, 31... reduction gear, 310... transmission shaft, 310a... hollow portion, 311... first gear, 312... second gear, 313... third gear, 314... intermediate shaft, 32... differential device, 321... fourth gear, 33... parking mechanism, 331... parking gear, 332... rotation prevention portion, 333... parking motor, 341... first gear bearing a bearing for supporting the first drive shaft, 342 second gear bearing, 343 third gear bearing, 344 fourth gear bearing, 4 pump, 41 suction port, 42 strainer, 43 discharge port, 5 housing, 51 first housing member, 510 mounting portion, 511 cylindrical portion, 512 side plate portion, 5120 insertion hole, 513 plate portion, 514 peripheral wall portion, 515 first drive shaft passing hole, 516 second motor bearing retaining portion, 517 first gear bearing retaining portion, 518 third gear bearing retaining portion, 519 ···Side plate opening, 52···Second housing member, 521···Second gear bearing retaining portion, 522···Fourth gear bearing retaining portion, 523···Second drive shaft passing hole, 524···First oil reservoir, 525···Second oil reservoir, 526···First wall portion, 527···Second wall portion, 528···Wall portion, 53···Third housing member, 531···First motor bearing retaining portion, 54···Fourth housing member, 55···Oil passage, 551···First oil passage, 552···Second oil passage, 553···Third oil passage, 5530···Connecting pipe, 554···Fourth oil passage,555...first supply passage, 556...second supply passage, 557...third supply passage, 558...oil supply section, 5580...spray hole, 61...motor housing section, 62...gear housing section, 63...inverter housing section, 64...pump housing section, 7...inverter unit, 8...oil cooler, CL...oil, Ds...drive shaft, J2...rotating shaft, J4...intermediate shaft, J5...differential shaft, P...oil reservoir, RE...refrigerant, 200...vehicle, 150...battery,

Claims

1. a motor including a rotor having a motor shaft rotatable about a rotation axis extending along a horizontal direction, and a stator located radially outward from the rotor; a gear portion connected to one axial end of the motor shaft; a housing that accommodates the motor and the gear portion; a pump that supplies oil contained in the housing to the motor; an oil cooler for cooling the oil; Equipped with The housing includes: a first housing member including a cylindrical portion extending in an axial direction parallel to the rotation axis, a side plate portion covering one axial end of the cylindrical portion, and a pump accommodating portion accommodating the pump; a second housing member attached to one axial end of the side plate portion; a third housing member that closes the other axial end of the cylindrical portion; a motor accommodating portion that is a space surrounded by the cylindrical portion, the side plate portion, and the third housing member and that accommodates the motor; a gear accommodating portion that is a space surrounded by the side plate portion and the second housing member and that accommodates the gear portion; a side plate opening that axially penetrates the side plate and connects the motor accommodating portion and the gear accommodating portion; an oil passage through which the oil flows; having The oil passage includes a first oil passage, a second oil passage, a third oil passage, and a fourth oil passage, the first oil passage connects the gear housing portion and the pump housing portion, the second oil passage connects the pump housing portion and the oil cooler, the third oil passage connects the oil cooler and the fourth oil passage, the fourth oil passage connects the third oil passage and the motor accommodating portion, the first oil passage, the second oil passage, and the third oil passage are each formed in the first housing member, The fourth oil passage is formed in the third housing member.

2. An inverter unit is further provided to supply driving power to the motor. The housing includes: a fourth housing member disposed vertically above the cylindrical portion; an inverter accommodating portion that accommodates the inverter unit; and The first housing member includes: A plate portion, a peripheral wall portion surrounding the inverter accommodating portion; and the inverter accommodating portion is a space surrounded by the cylindrical portion, the plate portion, the peripheral wall portion, and the fourth housing member, The drive device according to claim 1 , wherein the second oil passage and the third oil passage are each formed of the same material as one of the plate portion and the peripheral wall portion.

3. the inverter unit is integrally fixed to a fourth housing member, The drive device according to claim 2 , wherein the pump housing portion is formed in a peripheral wall portion surrounding the inverter housing portion.

4. A drive device mounted on a vehicle, the gear portion transmits the driving force of the motor to a drive shaft of the vehicle; The drive device according to claim 2 or 3, wherein the pump is disposed between the fourth housing member and the drive shaft.

5. In the front-back direction perpendicular to the axial direction, the pump and the oil cooler are disposed at one end of the housing in a front-rear direction, The drive unit according to claim 1 , wherein the motor accommodating portion is disposed in a portion on the other side in the front-rear direction of the housing.

6. The oil passage further includes a connecting pipe, 6. The drive device according to claim 1, wherein the connecting pipe is arranged on an inner surface of one of the third oil passage and the fourth oil passage at a connection portion between the third oil passage and the fourth oil passage, and is fitted into the other oil passage.

7. an oil supply unit connected to the fourth oil passage and supplying the oil to a radially outer surface of the stator; The motor shaft a cylindrical shaft portion extending in an axial direction; A hollow portion disposed inside the shaft tube portion; a shaft hole portion that penetrates the shaft tube portion in a radial direction; having The rotor has a rotor core fixed to a radially outer surface of the motor shaft, The rotor core is a rotor through hole that passes through the rotor core in an axial direction; a rotor space connecting the rotor through hole and the shaft hole portion; having the rotor through hole is connected to the fourth oil passage via the hollow portion, The drive device according to claim 1 , wherein when the rotor rotates, the oil is supplied from an axial end of the rotor through hole to an axial end of the stator.

8. The rotor core is a first rotor core having a first rotor through hole extending in an axial direction; a second rotor core having a second rotor through hole extending in the axial direction; an intermediate core disposed between the first rotor core and the second rotor core in the axial direction; having The intermediate core is a first annular portion disposed radially outward from the motor shaft; a second annular portion extending radially outward from a radially outer end of the first annular portion; a core opening extending through the first annular portion; having In an axial direction, a thickness of the second annular portion is greater than a thickness of the first annular portion, the rotor space is disposed between the first annular portion and at least one of the first rotor core and the second rotor core, the rotor through hole includes the first rotor through hole, the second rotor through hole, and the core opening, The drive device according to claim 7 , wherein the core opening overlaps at least a portion of the first rotor through hole and at least a portion of the second rotor through hole when viewed in the axial direction.

9. The fourth oil passage is a first supply passage connected to the third oil passage; a cylindrical second supply passage connecting the first supply passage and the oil supply unit; a third supply passage having a cylindrical shape that connects the first supply passage and the hollow portion of the motor shaft; having The drive device according to claim 7 or 8, wherein an inner diameter of the second supply passage is larger than an inner diameter of the third supply passage.

10. The drive apparatus of claim 9 , wherein an inner diameter of the second supply passage is greater than 1.6 times an inner diameter of the third supply passage.

11. A vehicle comprising the drive device according to any one of claims 1 to 10.

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