drive device

Abstract

A drive device includes a first shaft, a gear portion, a lubricating liquid flow path, and a housing. The gear portion having a second shaft is connected at one end portion in an axial direction of the first shaft. A side plate portion of the housing divides a motor cylinder portion that surrounds a motor housing portion in which a rotor and a stator are housed, and a gear cylinder portion that surrounds a gear housing portion in which the gear portion is housed. A first bearing holding portion and a second bearing holding portion provided on the side plate portion rotatably support the first shaft and the second shaft via a first bearing and a second bearing, respectively. A lubricating liquid supply portion provided at a position radially outward of the stator and supplying lubricating liquid to the stator has a lubricating liquid flow path through which lubricating liquid can flow. The lubricating liquid flow path is connected to at least one of the first and second bearing holding portions.

Description

Technical Field

[0001] The present invention relates to a drive device. Background Art

[0002] Conventionally, a motor drive device is known that supplies oil to the stator and bearings to cool both and lubricate the bearings. (For example, see Japanese Patent Publication No. 2019-131175)

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-131175

[0006] However, in this device, lubrication of the bearings is achieved by spraying oil from an oil passage formed by a tubular member. This complicates the oil supply path for cooling the stator and lubricating the bearings. Furthermore, the distance between the oil passage and the bearings can prevent them from being fully lubricated. Summary of the Invention

[0007] An object of the present invention is to perform both cooling of a stator and cooling and lubrication of a bearing using lubricating fluid flowing through a lubricating fluid flow path with a simpler structure.

[0008] An exemplary drive device of the present application includes a first shaft, a rotor, a stator, a gear portion, a lubricating fluid supply portion, and a housing. The first shaft extends along a first rotation axis extending in an axial direction, and is rotatable about the first rotation axis. The rotor is supported on the first shaft, and is rotatable with the first shaft. The stator is disposed at a position radially outward of the rotor. The gear portion is connected to an axial end portion of the first shaft. The lubricating fluid supply portion is disposed at a position radially outward of the stator, and supplies lubricating fluid to the stator. The housing accommodates the rotor, the stator, the lubricating fluid supply portion, and the gear portion. The gear portion has a second shaft extending along a second rotation axis extending in an axial direction. The housing has a motor cylinder portion, a gear cylinder portion, a side plate portion, a motor accommodation portion, and a gear accommodation portion. The motor cylinder portion extends in an axial direction. The gear cylinder portion is disposed at a position axially outward of the motor cylinder portion, and extends in an axial direction. The side plate portion extends in a direction intersecting the axial direction, and divides the motor cylinder portion and the gear cylinder portion. The motor accommodation portion is surrounded by the motor cylinder portion and the side plate portion, and accommodates the rotor and the stator. The gear accommodation portion is surrounded by the gear cylinder portion and the side plate portion, and accommodates the gear portion. The side plate portion has a first bearing holding portion and a second bearing holding portion. The first bearing holding portion supports the first shaft to be rotatable via a first bearing. The second bearing holding portion supports the second shaft to be rotatable via a second bearing. The lubricating fluid supply portion has a lubricating fluid flow path through which the lubricating fluid flows. The lubricating fluid flow path is connected to at least one of the first bearing holding portion and the second bearing holding portion.

[0009] According to the exemplary drive device of the present application, cooling of the stator and cooling and lubrication of the bearings can be performed using the lubricating fluid flowing in the lubricating fluid flow path, with a simpler structure. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic configuration view of the drive device as viewed from the Z-axis direction.

[0011] Figure 2 is a schematic configuration view of the drive device as viewed from the X-axis direction.

[0012] Figure 3 is a schematic configuration view of the drive device as viewed from the Y-axis direction.

[0013] Figure 4 is a perspective view of the drive device.

[0014] Figure 5 is a schematic view showing an example of a vehicle having the drive device.

[0015] Figure 6 is an exploded perspective view of the housing.

[0016] Figure 7A It is a cross-sectional view showing a structural example of a refueling portion according to an embodiment.

[0017] Figure 7B It is a cross-sectional view showing a first modified example of the structure of the refueling portion.

[0018] Figure 7C It is a cross-sectional view showing a second modified example of the structure of the refueling portion.

[0019] Figure 8 This is a schematic structural diagram of the end portion of the refueling portion on the +Y direction side as viewed from the X-axis direction.

[0020] Figure 9 This is a schematic structural diagram of the end portion of the refueling portion on the +Y direction side as viewed from the +Y direction toward the -Y direction.

[0021] Figure 10 This is a conceptual diagram showing another structural example of the hole portion.

[0022] Figure 11 This is a schematic structural diagram of a drive device according to a modified example as viewed from the X-axis direction.

[0023] (Explanation of Symbols)

[0024] 1 Drive unit, 2 Motor unit, 20 Output shaft, 21 Rotor, 22 Motor shaft, 220 Hollow portion, 221 Shaft cylinder portion, 222 Shaft hole portion, 23 Rotor core, 230 Rotor through hole, 231 Rotor communication portion, 24 Rotor magnet, 25 Stator, 26 Stator core, 27 Coil, 271 Coil end, 281 First motor bearing, 282 Second motor bearing, 3 Gear unit, 31 Speed ​​reduction device, 310 Transmission shaft, 3101 Hollow portion, 3102 Cylinder portion, 311 First gear, 312 Second gear, 313 Third gear, 314 Intermediate shaft, 32 Differential unit, 321 Fourth gear, 341 First gear bearing, 342 Second gear bearing, 343 Third gear bearing, 344 Fourth gear bearing, 4 Pump, 41 suction port, 42 filter portion, 43 discharge port, 5 housing, 51 first housing component, 511 motor cylinder, 512 side plate, 5120 insertion hole, 5121 hole portion, 5122 first communication path, 5123 second communication path, 5124 third communication path, 5125 protrusion, 5126 passage, 51261 second guide surface, 51262 groove portion, 513 gear cylinder, 5141 plate portion, 5142 peripheral wall portion, 515 first drive shaft through hole, 516 second motor bearing holding portion, 517 first gear bearing holding portion, 5171 outer annular surface, 5172 inner annular surface, 5173 peripheral wall portion, 518 third gear bearing holding portion, 5181 outer wall surface, 5182 inner wall surface, 5183 peripheral wall portion, 5184 guide portion, 51841 first surface, 51842 second surface, 51843 first guide surface, 519 side plate opening, 52 second housing component, 521 second gear bearing retaining portion, 522 fourth gear bearing retaining portion, 523 second drive shaft through hole, 5231 second output bearing retaining portion, 5232 second output bearing, 524 tray portion, 525 gear side oil passage, 526 gear side restriction component, 53 third housing component, 530 contact portion, 531 first motor bearing retaining portion, 532 first output bearing retaining portion, 5321 first output bearing, 54 fourth housing component, 55 motor side oil passage, 551 first oil passage, 552 second oil passage, 553 third oil passage, 5 530 connecting pipe, 5531 connecting flow path, 5532 cylindrical portion, 554 fourth oil path, 555 first supply path, 556 second supply path, 557 third supply path, 5571 supply limiting member, 558 oil supply portion, 558a first oil supply portion, 558b second oil supply portion, 5580 oil flow path, 5580a first oil flow path, 5580b second oil flow path, 5581 diffusion hole, 5582 supply hole, 61 motor housing portion, 62 gear housing portion, 63 inverter housing portion, 64 pump housing portion, 7 inverter unit, 8 oil cooler, CL oil, Ds drive shaft, J2 rotation axis, J4 intermediate axis, J5 differential axis, P oil reservoir, RE refrigerant, 200 vehicle, 150 battery. DETAILED DESCRIPTION

[0025] Exemplary embodiments will be described below with reference to the accompanying drawings.

[0026] In the following description, the direction of gravity is specified for description based on the positional relationship when the drive device 1 is installed in the vehicle 200 located on a horizontal road. In addition, in the accompanying drawings, the XYZ coordinate system is appropriately represented as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the up and down direction). The +Z direction is upward (toward the vertically upward direction opposite to the direction of gravity), and the -Z direction is downward (toward the vertically downward direction in the same direction as gravity). In addition, the "Z-axis direction" in the following description is an example of the "second direction" of the present invention. In each component, the upper end is referred to as the "upper end", and the position of the upper end in the axial direction is referred to as the "upper end". Furthermore, the lower end is referred to as the "lower end", and the position of the lower end in the axial direction is referred to as the "lower end". In addition, in the surface of each component, the surface facing upward is referred to as the "upper surface", and the surface facing downward is referred to as the "lower surface".

[0027] The X-axis direction is a direction perpendicular to the Z-axis direction and represents the front-to-back direction of vehicle 200 on which drive device 1 is installed. The "X-axis direction" in the following description is an example of the "first direction" of the present invention. The +X direction is the front of vehicle 200, and the -X direction is the rear of vehicle 200. However, the +X direction may be the rear of vehicle 200 and the -X direction may be the front of vehicle 200.

[0028] The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and represents the width direction (left-right direction) of the vehicle 200. The +Y direction is the left direction of the vehicle 200, and the -Y direction is the right direction of the vehicle 200. However, in the case where the +X direction is the rear of the vehicle 200, the +Y direction may be the right direction of the vehicle 200, and the -Y direction may be the left direction of the vehicle 200. That is, regardless of the X-axis direction, only the +Y direction is one side of the left-right direction of the vehicle 200, and the -Y direction is the other side of the left-right direction of the vehicle 200. In addition, depending on the method of installing the drive device 1 on the vehicle 200, the X-axis direction may sometimes be the width direction (left-right direction) of the vehicle 200 and the Y-axis direction may be the front-back direction of the vehicle 200. In the following embodiment, the Y-axis direction is parallel to, for example, the rotation axis J2 of the motor unit 2. In addition, the "Y-axis direction" in the following description is an example of the "axial direction" of the present invention. In addition, the “+Y direction” is an example of the “one side in the axial direction” of the present invention, and the “−Y direction” is an example of the “other side in the axial direction” of the present invention.

[0029] In the following description, unless otherwise specified, the direction (Y-axis direction) parallel to a specified axis such as the rotation axis J2 of the motor unit 2 is sometimes referred to as the "axial direction". In addition, the direction orthogonal to the specified axis is referred to as the "radial direction", and the circumferential direction centered on the specified axis is referred to as the "circumferential direction". The direction close to the axis in the radial direction is referred to as the "radial inside", and the direction away from the axis is referred to as the "radial outside". In each component, the radially inner end is referred to as the "radial inner end". And, the outer end is referred to as the "radial outer end". In addition, in the side surfaces of each component, the side surface facing radially inward is referred to as the "radial inner side surface", and the side surface facing radially outward is referred to as the "radial outer side surface".

[0030] In this specification, the term "annular" includes shapes that are continuously connected without a break throughout the entire circumferential area centered on the central axis CA, as well as shapes that have one or more breaks in a portion of the entire area centered on the central axis CA. Furthermore, it includes shapes that describe a closed curve on a curved surface centered on the central axis CA and intersecting the central axis CA.

[0031] Furthermore, in the positional relationship between any one of an orientation, a line, and a plane and any other, "parallel" encompasses 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" encompass not only a state in which the two intersect at 90 degrees, but also a state in which they are substantially perpendicular and substantially orthogonal. In other words, "parallel," "perpendicular," and "orthogonal" each encompass a state in which the positional relationship between the two has an angular deviation to the extent that does not deviate from the gist of the present invention.

[0032] In addition, these are names used for explanation only and are not intended to limit actual positional relationships, directions, names, etc.

[0033] <1. Drive unit 1>

[0034] Hereinafter, a driving device 1 according to an exemplary embodiment of the present invention will be described with reference to the drawings. Figures 1 to 3 This is a conceptual diagram of the drive device 1 according to the embodiment. Figure 1 This is a schematic structural diagram of the driving device 1 as viewed from the Z-axis direction. Figure 2 This is a schematic structural diagram of the driving device 1 as viewed from the X-axis direction. Figure 3 This is a schematic structural diagram of the driving device 1 as viewed from the Y-axis direction. Figure 4 It is a perspective view of the driving device 1 . Figure 5 1 is a schematic diagram showing an example of a vehicle 200 having the drive device 1. Figures 1 to 5 This is only a conceptual diagram, and the arrangement and dimensions of each part are not necessarily the same as those of the actual driving device 1 .

[0035] The drive device 1 is mounted on a vehicle 200 (see FIG. 1 ) that uses at least a motor as a power source, such as a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV). Figure 5 The drive device 1 serves as a power source for the vehicle 200. The vehicle 200 includes the drive device 1 and a battery 150. The battery 150 stores electric power for supplying the drive device 1. In the example of the vehicle 200, the drive device 1 drives the left and right front wheels. Alternatively, the drive device 1 only needs to drive at least one of the wheels.

[0036] like Figure 1 As shown, the drive device 1 has a motor unit 2. The motor unit 2 has an output shaft 20, a rotor 21, and a stator 25. In other words, the drive 1 includes the output shaft 20, the rotor 21, and the stator 25. The output shaft 20 extends along the rotation axis J2 extending in the Y-axis direction and can rotate around the rotation axis J2. In addition, the output shaft 20 is an example of the "first shaft" of the present invention, and the rotation axis J2 is an example of the "first rotation axis" of the present invention. The rotor 21 is supported on the output shaft 20 and can rotate together with the output shaft 20. The stator 25 is arranged at a position radially outward of the rotor 21.

[0037] The drive device 1 also includes a gear unit 3, an oil supply unit 558, and a housing 5. The gear unit 3 is connected to the end of the motor shaft 22 in the +Y direction. The oil supply unit 558 is located radially outward from the stator 25 and supplies oil CL to the stator 25. The oil supply unit 558 is an example of a "lubricating liquid supply unit" according to the present invention, and the oil CL is an example of a "lubricating liquid" according to the present invention. The housing 5 houses the rotor 21, the stator 25, the oil supply unit 558, and the gear unit 3.

[0038] The drive device 1 also includes a pump 4 and an oil cooler 8. The pump 4 supplies oil CL contained in the housing 5 to the motor unit 2. As described above, the drive device 1 includes the pump 4. 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 unit 2.

[0039] Furthermore, the drive device 1 further includes an inverter unit 7 . The inverter unit 7 supplies driving power to the motor unit 2 .

[0040] A housing space for housing the motor unit 2, the gear unit 3, the pump 4, and the inverter unit 7 is provided within the housing 5. As will be described later, this housing space is divided into a motor housing portion 61 for housing the motor unit 2, a gear housing portion 62 for housing the gear unit 3, an inverter housing portion 63 for housing the inverter unit 7, and a pump housing portion 64 for housing the pump 4. The inverter unit 7 is integrally fixed to a fourth housing member 54, described later.

[0041] <1-1. Motor section 2>

[0042] The motor portion 2 is housed in a motor housing portion 61 of the case 5. As described above, the motor portion 2 has an output shaft 20, a rotor 21, and a stator 25.

[0043] <1-1-1. Output shaft 20>

[0044] The output shaft 20 is a cylinder shape extending in the Y-axis direction. The output shaft 20 has a motor shaft 22 and a transmission shaft 310. The motor shaft 22 and the transmission shaft 310 extend along a rotation axis J2. A hollow transmission shaft 310 described later is connected to an end portion on the +Y direction side of the motor shaft 22. In the present embodiment, the both are spline-fitted. Alternatively, the both can be joined by a fixing method such as welding. Details of the transmission shaft 310 will be described later.

[0045] 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, for example, a ball bearing, and is held on a third case member 53 described later of the case 5. The second motor bearing 282 is, for example, a ball bearing, and is held on a side plate portion 512 described later of the case 5.

[0046] The motor shaft 22 is a hollow shaft of a cylinder shape. The motor shaft 22 has a hollow portion 220 and a shaft cylinder portion 221 extending in the Y-axis direction. The hollow portion 220 is surrounded by an inner side surface of the shaft cylinder portion 221, and is connected to a third supply path 557 described later. Specifically, the hollow portion 220 is communicated with a first motor bearing holding portion 531 housing the first motor bearing 281 at an end portion on the -Y direction side of the shaft cylinder portion 221, and is connected to the third supply path 557. Further, the hollow portion 220 is communicated with a hollow portion 3101 of the transmission shaft 310 described later at an end portion on the +Y direction side of the shaft cylinder portion 221. Further, the motor shaft 22 has a shaft hole portion 222. The shaft hole portion 222 penetrates the shaft cylinder portion 221 in the radial direction.

[0047] <1-1-2. Rotor 21>

[0048] The rotor 21 rotates about the rotation axis J2 extending in the horizontal direction by supplying electric power to the stator 25 from a battery (not shown). The rotor 21 has, in addition to the motor shaft 22, a rotor core 23 and rotor magnets 24.

[0049] The rotor core 23 is a cylinder extending in the Y-axis direction. The rotor core 23 is fixed to a radially outer side surface of the motor shaft 22. As described above, the rotor 21 has the rotor core 23. Further, a plurality of rotor magnets 24 are fixed to the rotor core 23. The plurality of rotor magnets 24 are arranged in the circumferential direction in a manner that magnetic poles alternate.

[0050] The rotor core 23 has a rotor through-hole 230. The rotor through-hole 230 extends through the rotor core 23 in the Y-axis direction and is connected to the shaft hole 222. The rotor through-hole 230 is connected to the third supply path 557 via the hollow portion 220. Specifically, the rotor core 23 has a rotor communication portion 231. The rotor communication portion 231 extends from the radially inner side of the rotor core 23 to the rotor through-hole 230, connecting the rotor through-hole 230 and the shaft hole 222. The rotor through-hole 230 serves as a flow path for oil CL, which cools the rotor 21 from the inside. As will be described later, 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 222 and the rotor communication portion 231. Thus, when the rotor 21 rotates, the oil CL flows out from the axial end of the rotor through-hole 230. This oil CL is supplied to the axial ends of the stator 25, particularly to coil ends 271 (described later) disposed at the axial ends of the stator 25, by the centrifugal force generated by the rotation of the rotor 21. This oil CL cools the axial ends of the stator 25, particularly the coil ends 271 of the stator 25.

[0051] <1-1-3. Stator 25>

[0052] The stator 25 surrounds the rotor 21 from the radial outside and drives the rotor 21 to rotate. As described above, the stator 25 is arranged at a position radially outside the rotor 21. That is, the motor unit 2 is an inner rotor type motor in which the rotor 21 is rotatably arranged inside the stator 25. The stator 25 includes: 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 retained in the housing 5. The stator core 26 has a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumference of the annular yoke.

[0053] Coil wire is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes coil 27. The coil wire is connected to inverter unit 7 via a bus bar (not shown). Coil 27 has coil ends 271 that protrude from the axial end surface of stator core 26. Coil ends 271 protrude axially further than the ends of rotor core 23 of rotor 21.

[0054] <1-2. Gear Unit 3>

[0055] Then, the gear unit 3 transmits the driving force of the motor unit 2 to the drive shaft Ds that drives the wheels of the vehicle 200. The gear unit 3 will be described in detail with reference to the accompanying drawings. Figure 1 As shown in FIG. 5 and FIG. 6 , the gear unit 3 is housed in the gear housing portion 62 of the housing 5 . The gear unit 3 includes a speed reduction device 31 and a differential device 32 .

[0056] <1-2-1. Speed ​​Reducer 31>

[0057] The reduction gear 31 is connected to the motor shaft 22 . The reduction gear 31 reduces the rotational speed of the motor unit 2 , increases the torque output from the motor unit 2 by a reduction ratio, and transmits the increased torque to the differential device 32 .

[0058] The reduction gear 31 includes a transmission shaft 310, a first gear (intermediate drive gear) 311, a second gear (intermediate gear) 312, a third gear (final drive gear) 313, and an intermediate shaft 314. In other words, the gear unit 3 includes a first gear 311 fixed to the radially outer side of the output shaft 20, and a second gear 312 and a third gear 313 fixed to the radially outer side of the intermediate shaft 314. Furthermore, the gear unit 3 includes a transmission shaft 310 and an intermediate shaft 314. The torque output from the motor unit 2 is transmitted to the fourth gear 321 of the differential unit 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 ratios and number of gears can be varied depending on the desired reduction ratio. The reduction gear 31 is a parallel-axis gear-type speed reducer in which the axes of the gears are arranged in parallel. The motor shaft 22 and the transmission shaft 310 are spline-engaged.

[0059] The transmission shaft 310 extends in the Y-axis direction about the rotation axis J2 and rotates along the rotation axis J2 along with the motor shaft 22. 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, for example, a ball bearing and, as described below, is held by the side plate 512 of the housing 5. The second gear bearing 342 is, for example, a ball bearing and is held by the second housing member 52, described below.

[0060] The transmission shaft 310 is a cylindrical hollow shaft. The transmission shaft 310 has a hollow portion 3101 and a cylindrical transmission shaft cylinder portion 3102 extending in the Y-axis direction. The hollow portion 3101 is surrounded by the inner side surface of the transmission shaft cylinder portion 3102 and is connected to the gear side oil circuit 525 described later at the end portion on the +Y direction side of the transmission shaft cylinder portion 3102. The end portion on the -Y direction side of the transmission shaft cylinder portion 3102 is connected to the end portion on the +Y direction side of the motor shaft 22. In addition, the end portion on the +Y direction side of the transmission shaft cylinder portion 3102 is rotatably held by the second gear bearing retaining portion 521 via the second gear bearing 342.

[0061] Furthermore, not limited to the example of this embodiment, the transmission shaft 310 may be the same component as the motor shaft 22, that is, may be integral therewith. In other words, the motor shaft 22 may be a hollow shaft extending across the motor housing 61 and the gear housing 62 of the housing 5. In this case, the end of the motor shaft 22 on the +Y direction side protrudes toward the gear housing 62 and is rotatably supported by the second gear bearing 342. Furthermore, the hollow portion 220 of the motor shaft 22 communicates with the first motor bearing retaining portion 531, which houses the first motor bearing 281, and the second gear bearing retaining portion 521, which houses the second gear bearing 342.

[0062] The first gear 311 is disposed on the outer circumferential surface of the transmission shaft 310. The first gear 311 can be the same component as the transmission shaft 310 or a different component. If the first gear 311 and the transmission shaft 310 are different components, the first gear 311 and the transmission shaft 310 are securely fixed by shrink fit or other means. The first gear 311 is rotatable along with the transmission shaft 310 about the rotation axis J2.

[0063] The intermediate shaft 314 extends along the intermediate axis J4 extending in the Y-axis direction. In addition, the intermediate shaft 314 is an example of the "second shaft" of the present invention, and the intermediate axis J4 is an example of the "second rotation axis" of the present invention. The gear portion 3 has an intermediate shaft 314. The intermediate shaft 314 is supported by the housing 5 so as to be rotatable around the intermediate axis J4 parallel to the rotation axis J2. Both ends of the intermediate shaft 314 are supported by the third gear bearing 343 and the fourth gear bearing 344 so as to be rotatable. The third gear bearing 343 is, for example, a ball bearing, and is retained on the side plate portion 512 of the housing 5. The fourth gear bearing 344 is, for example, a ball bearing, and is retained on the second housing component 52.

[0064] As described above, the second gear 312 and the third gear 313 are disposed on the outer circumferential surface of the intermediate shaft 314. The second gear 312 and the third gear 313 can be the same component as the intermediate shaft 314 or different components. If the second gear 312 and the intermediate shaft 314 are different components, they are securely fastened together by shrink fit or other means. If the third gear 313 and the intermediate shaft 314 are different components, they are securely fastened together by shrink fit or other means. The third gear 313 is positioned closer to the side plate 512 (i.e., in the -Y direction) than the second gear 312.

[0065] 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 the intermediate axis J4. The second gear 312 meshes with the first gear 311. The third gear 313 meshes with the fourth gear 321 of the differential device 32.

[0066] The intermediate axis J4 is arranged closer to the +Z direction (for example, see Figure 2 ) position. Because the intermediate axis J4 of the intermediate shaft 314 is positioned closer to the +Z direction than both the rotation axis J2 of the output shaft 20 and the differential axis J5 of the fourth gear 321, the distance between the output shaft 20 and the fourth gear 321 can be further shortened in the X-axis direction. Consequently, the gear housing 62 housing the gear unit 3 can be made more compact in the X-axis direction. Consequently, the drive device 1 can be miniaturized.

[0067] The torque of the transmission shaft 310 is transmitted from the first gear 311 to the second gear 312. 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 way, the reduction gear 31 transmits the torque output from the motor unit 2 to the differential device 32.

[0068] <1-2-2. Differential Device 32>

[0069] The differential device 32 is mounted on the drive shaft Ds. The differential device 32 transmits the output torque of the motor unit 2 to the drive shaft Ds. The drive shaft Ds is respectively mounted on the left and right sides of the differential device 32. The drive shaft Ds extends along the differential axis J5 extending in the Y-axis direction and can rotate around the differential axis J5. The differential device 32 has, for example, the following functions: when the vehicle 200 turns, it absorbs the speed difference between the left and right wheels (drive shaft Ds) and transmits the same torque to the left and right drive shafts Ds. The differential device 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).

[0070] The fourth gear 321 can rotate around the differential axis J5 extending in the Y-axis direction. In addition, the differential axis J5 is an example of the "third rotation axis" of the present invention and is parallel to the rotation axis J2. The gear portion 3 has a fourth gear 321. The torque output from the motor portion 2 is transmitted to the fourth gear 321 via the reduction gear 31. The differential device 32 transmits the torque of the fourth gear 321 to the drive shaft Ds. In addition, the lower portion of the fourth gear 321 (i.e., the portion on the -Z direction side) is immersed in the lower oil reservoir P in the gear housing 62. For example, when the fourth gear 321 of the differential device 32 rotates, the oil CL is lifted by the tooth surface of the fourth gear 321. A portion of the oil is supplied to the interior of the gear housing 62 for lubrication of the gears and bearings of the reduction gear 31 and the differential device 32 in the gear housing 62. In addition, another part of the raised oil CL is accumulated in the tray portion 524 described later, and then supplied to the hollow portion 220 of the motor shaft 22 through the gear side oil passage 525 described later and the hollow portion 3101 of the transmission shaft 310 to be used for cooling the stator 25.

[0071] <1-3. Pump 4 and Oil Cooler 8>

[0072] Next, the pump 4 is an electrically driven electric pump connected to the inverter unit 7 via a wiring harness (not shown). Specifically, the pump 4 is driven by the inverter unit 7. A DC pump, a centrifugal pump, or the like can be employed as the pump 4. The pump 4 is housed in a pump housing 64 formed in the housing 5. For example, the pump 4 is secured to the housing 5 using bolts (not shown).

[0073] 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 described later. The suction port 41 of the pump 4 is connected to the filter 42 via the first oil passage 551 described later. The filter 42 is arranged in the gear housing 62 of the housing 5. The filter 42 is arranged in the oil reservoir P (see the oil reservoir P) of the gear housing 62 described later. Figure 2 The filter unit 42 is driven by the pump 4 to draw in oil CL from an inlet (not shown) located on its lower surface and supplies it to the suction port 41 of the pump 4. A filtering structure, such as a filter (not shown), is attached to the filter unit 42. The attachment of the filtering structure prevents foreign matter from entering the pump 4 and the motor unit 2.

[0074] The discharge port 43 of the pump 4 opens into the pump housing 64. In other words, the oil CL protruding from the pump 4 fills the pump housing 64. The pump housing 64 is connected to the second oil passage 552, described later. The pump 4 discharges the oil CL drawn in through the suction port 41 from the discharge port 43 and delivers it to the oil cooler 8 via the second oil passage 552.

[0075] The oil cooler 8 performs heat exchange between the oil CL delivered from the pump 4 via the second oil passage 552 and the refrigerant RE supplied from a system separate from the motor-side oil passage 55 (described later) that includes the second oil passage 552. Thus, the oil cooler 8 cools the oil CL delivered from the pump 4. The oil CL cooled by the oil cooler 8 is supplied to the motor unit 2 via the third oil passage 553 and the fourth oil passage 554 (described later). The refrigerant RE cools the IGBTs and SIC elements (not shown) of the inverter unit 7 before being supplied to the oil cooler 8.

[0076] The pump housing portion 64 is formed on the peripheral wall portion 5142 surrounding the inverter housing portion 63 (see, for example, Figure 3 For example, the pump housing portion 64 can be arranged using a dead space other than the space occupied by the inverter unit 7 in the inverter housing portion 63. In this way, since the pump 4 can be arranged compactly, it can contribute to the miniaturization of the drive device 1.

[0077] <1-4. Housing 5>

[0078] Next, refer to Figures 1 to 4 and Figure 6 The structure of the housing 5 will be described. Figure 6 It is an exploded view of the housing 5. Figure 6 As shown, the housing 5 has a first housing part 51 , a second housing part 52 and a third housing part 53 .

[0079] The first housing component 51 includes a cylindrical motor barrel portion 511, a side plate portion 512, and a gear barrel portion 513 that surround the stator 25. That is, the housing 5 includes a motor barrel portion 511, a side plate portion 512, and a gear barrel portion 513. The motor barrel portion 511 extends in the Y-axis direction. The gear barrel portion 513 is arranged at a position closer to the +Y direction than the motor barrel portion 111 and extends in the Y-axis direction. The side plate portion 512 extends in a direction intersecting the Y-axis direction, dividing the motor barrel portion 511 and the gear barrel portion 513. The side plate portion 512 covers the end portion of the motor barrel portion 511 on the +Y direction side and covers the end portion of the motor barrel portion 511 on the -Y direction side. In this embodiment, the motor barrel portion 511, the side plate portion 512, and the gear barrel portion 513 are integrated. However, this is not limited to this example, and a part of the motor barrel portion 511, the side plate portion 512, and the gear barrel portion 513 may also be a component different from the other parts.

[0080] The side plate 512 includes a second motor bearing retaining portion 516, a first gear bearing retaining portion 517, and a third gear bearing retaining portion 518. The second motor bearing retaining portion 516 and the first gear bearing retaining portion 517 are examples of the "first bearing retaining portion" of the present invention. The third gear bearing retaining portion 518 is an example of the "second bearing retaining portion" of the present invention. The second motor bearing retaining portion 516 and the first gear bearing retaining portion 517 rotatably support the output shaft 20 via the second motor bearing 282 and the first gear bearing 341. The second motor bearing 282 and the first gear bearing 341 are examples of the "first bearing" of the present invention. Specifically, the second motor bearing retaining portion 516 rotatably supports the motor shaft 22 via the second motor bearing 282. The first gear bearing retaining portion 517 rotatably supports the transmission shaft 310 via the first gear bearing 341. The third gear bearing retaining portion 518 rotatably supports the intermediate shaft 314 via the third gear bearing 343. In addition, the third gear bearing 343 is an example of the "second bearing" of the present invention.

[0081] In addition, the side plate portion 512 also has a hole portion 5121 (see, for example, Figure 2 The hole 5121 extends through the side plate 512 along the Y-axis and is connected to the third gear bearing retaining portion 518. Specifically, the hole 5121 is a space disposed within the side plate 512, extending from the end surface on the -Y-direction side to the end surface on the +Y-direction side of the side plate 512. In this embodiment, the hole 5121 extends along the Y-axis.

[0082] The second housing member 52 is attached to the +Y-direction end of the gear cylinder 513. The second housing member 52 closes and obstructs the +Y-direction end of the gear cylinder 513. The second housing member 52, the side plate 512, and the gear cylinder 513 constitute the gear housing 62, which will be described later.

[0083] The third housing member 53 is attached to the -Y-side end of the motor barrel 511. The third housing member 53 closes and obstructs the -Y-side end of the motor barrel 511. The third housing member 53, the motor barrel 511, and the side plate 512 constitute the motor housing portion 61, which will be described later.

[0084] like Figure 3As shown, the contact portion 530 where the third housing member 53 contacts the motor barrel 511 is annular when viewed in the Y-axis direction. The housing 5 includes a series of contact portions 530 where the motor barrel 511 contacts the third housing member 53. The third housing member 53 includes a first motor bearing 281 that rotatably supports the shaft barrel 221. Furthermore, the third housing member 53 includes a first motor bearing retaining portion 531 that retains the first motor bearing 281. The first motor bearing retaining portion 531 rotatably supports the end portion of the motor shaft 22 on the -Y direction side via the first motor bearing 281.

[0085] The housing 5 further includes a fourth housing member 54 . The fourth housing member 54 is disposed closer in the +Z direction than the motor cylinder 511 . The fourth housing member 54 is attached to an upper portion of the first housing member 51 .

[0086] The housing 5 also includes a motor housing 61 and a gear housing 62. The motor housing 61 is surrounded by the motor barrel 511 and the side plate 512 and houses the rotor 21 and the stator 25. The gear housing 62 is surrounded by the gear barrel 513 and the side plate 512 and houses the gear unit 3. Specifically, the motor housing 61 is a space enclosed by the motor barrel 511, the side plate 512, and the third housing member 53. The gear housing 62 is a space enclosed by the side plate 512, the gear barrel 513, and the second housing member 52. An oil reservoir P for storing oil CL is provided at the vertical lower portion of the gear housing 62. The motor housing 61 and the gear housing 62 are divided by the side plate 512.

[0087] In addition, the housing 5 also has an inverter storage portion 63 for storing the inverter unit 7. The inverter storage portion 63 is a space surrounded by the motor barrel portion 511, the plate portion 5141 described later, and the peripheral wall portion 5142 described later. The inverter storage portion 63 is open in the +Z direction. This opening is covered by the fourth housing member 54. In addition, the inverter unit 7 is integrally fixed to the fourth housing member 54. That is, by integrally fixing the inverter unit 7 to the lower side of the fourth housing member 54, the inverter unit 7 is fixed downward in the inverter storage portion 63. In addition, an inverter cooling path (not shown) may also be provided on the fourth housing member 54.

[0088] The housing 5 also includes a pump housing portion 64 . The pump housing portion 64 houses the pump 4 . The pump housing portion 64 is formed in the first housing member 51 . That is, the first housing member 51 also includes the pump housing portion 64 .

[0089] Next, the first shell member 51 also has a plate portion 5141 and a peripheral wall portion 5142. That is, the shell 5 has a plate portion 5141 and a peripheral wall portion 5142. The plate portion 5141 extends from the motor barrel portion 511 in the X-axis direction perpendicular to the Y-axis direction. The peripheral wall portion 5142 surrounds the inverter storage portion 63 when viewed from the Z-axis direction perpendicular to the Y-axis direction and the X-axis direction. In detail, the plate portion 5141 extends from the outer surface of the motor barrel portion 511 in the -X direction. The peripheral wall portion 5142 protrudes from the upper end portion of the motor barrel portion 511 and the plate portion 5141 in the +Z direction, and surrounds the inverter storage portion 63 when viewed from the vertical direction (refer to Figure 1 ).

[0090] The first housing member 51 further includes an insertion hole 5120 , a first drive shaft through 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 .

[0091] The insertion hole 5120 and the first drive shaft through-hole 515 are disposed in the side plate portion 512, extending through the side plate portion 512 in the Y-axis direction. The center of the insertion hole 5120 is aligned with the rotation axis J2. A second motor bearing retaining portion 516 is disposed on the -Y-direction side of the insertion hole 5120. A first gear bearing retaining portion 517 is disposed on the +Y-direction side of the insertion hole 5120. The second motor bearing retaining portion 516 and the first gear bearing retaining portion 517 are connected through the insertion hole 5120.

[0092] The drive shaft Ds passes through the first drive shaft through-hole 515 in a rotatable state. In addition, a second drive shaft through-hole 523 is arranged on the second housing component 52. The second drive shaft through-hole 523 is a hole that passes through the second housing component 52 in the Y-axis direction. The drive shaft Ds passes through the second drive shaft through-hole 523 in a rotatable manner. When viewed from the Y-axis direction, the second drive shaft through-hole 523 overlaps with the first drive shaft through-hole 515. Thus, the drive shaft Ds arranged at both ends of the differential device 32 in the Y-axis direction rotates around the differential axis J5. In order to suppress leakage of oil CL, oil seals (not shown) are provided between the drive shaft Ds and the first drive shaft through-hole 515, and between the drive shaft Ds and the second drive shaft through-hole 523. An axle (not shown) that rotates the wheel is connected to the front end of the drive shaft Ds.

[0093] The second motor bearing retaining portion 516 extends from the edge of the insertion hole 5120 in the -Y direction. The outer ring of the second motor bearing 282 is fixed to the second motor bearing retaining portion 516. The +Y-side end of the motor shaft 22 is fixed to the inner ring of the second motor bearing 282. Furthermore, the first motor bearing retaining portion 531 is disposed on the +Y-side of the third housing member 53. The center axes of the first motor bearing retaining portion 531 and the second motor bearing retaining portion 516 are aligned with the rotation axis J2. The outer ring of the first motor bearing 281 is fixed to the first motor bearing retaining portion 531. The -Y-side end of the motor shaft 22 is fixed to the inner ring of the first motor bearing 281. Thus, the motor unit 2 rotatably supports both ends of the rotor 21 in the Y-axis direction on the housing 5 via the first motor bearing 281 and the second motor bearing 282.

[0094] The first gear bearing retaining portion 517 extends from the edge of the insertion hole 5120 in the +Y direction. The outer ring of the first gear bearing 341 is fixed to the first gear bearing retaining 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. In addition, the second gear bearing retaining portion 521 is arranged on the -Y direction side of the second housing member 52. The center axis of the second gear bearing retaining portion 521 and the first gear bearing retaining portion 517 is consistent with the rotation axis J2. The outer ring of the second gear bearing 342 is fixed to the second gear bearing retaining 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.

[0095] Next, the third gear bearing retaining portion 518 is cylindrical and extends from the side plate portion 512 in the +Y direction. The third gear bearing retaining portion 518 is positioned closer to the first gear bearing retaining portion 517 in the -X and +Z directions. The outer ring of the third gear bearing 343 is fixed to the third gear bearing retaining portion 518. The intermediate shaft 314 is fixed to the inner ring of the third gear bearing 343. Furthermore, the fourth gear bearing retaining portion 522 is located on the -Y side of the second housing member 52. The fourth gear bearing retaining portion 522 is cylindrical and extends from the second housing member 52 in the -Y direction. The center axes of the third gear bearing retaining portion 518 and the fourth gear bearing retaining portion 522 coincide with the intermediate axis J4. The outer ring of the fourth gear bearing 344 is fixed to the fourth gear bearing retaining portion 522. Furthermore, the +Y end of the intermediate shaft 314 is fixed to the inner ring of the fourth gear bearing 344. Thus, 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 .

[0096] The side plate opening 519 is disposed on the side plate portion 512 that divides the motor housing portion 61 and the gear housing portion 62. The housing 5 includes the side plate opening 519. The side plate opening 519 extends through the side plate portion 512 in the Y-axis direction, connecting the motor housing portion 61 and the gear housing portion 62. In particular, the side plate opening 519 connects the lower portion of the motor housing portion 61 with the lower portion of the gear housing portion 62. The side plate opening 519 allows the oil CL accumulated in the lower portion of the motor housing portion 61 to move to the gear housing portion 62. The oil CL that has moved to the gear housing portion 62 can flow into the oil reservoir P.

[0097] Next, the structure of the second housing member 52 will be described. The second housing member 52 is mounted on the +Y direction side of the gear cylinder portion 513 of the first housing member 51. The second housing member 52 is concave and opens toward the side plate portion 512. Figure 1 As shown in FIG. 5 , the second housing member 52 includes a second gear bearing holding portion 521, a fourth gear bearing holding portion 522, and a second drive shaft through hole 523. Since these are already described above, their description is omitted here.

[0098] The second housing member 52 includes a tray portion 524 , a gear-side oil passage 525 , and a gear-side restricting member 526 . In other words, the housing 5 includes the tray portion 524 , the gear-side oil passage 525 , and the gear-side restricting member 526 .

[0099] The tray portion 524 is positioned radially outward of the fourth gear 321 relative to the differential axis J5 and opens in the +Z direction (i.e., vertically upward). Oil CL lifted by the fourth gear 321 is stored in the tray portion 524. The tray portion 524 extends from the side plate portion 512 in the +Y direction. The end of the tray portion 524 in the +Y direction is connected to the inner surface of the second housing member 52 facing the -Y direction.

[0100] The gear side oil circuit 525 is formed inside the second housing member 52. The gear side oil circuit 525 is a flow path for the oil CL that connects the end portion of the tray portion 524 on the +Y direction side and the second gear bearing retaining portion 521. In addition, one end of the gear side oil circuit 525 is connected to the end portion of the tray portion 524 on the +Y direction side and is connected to the tray portion 524. The other end of the gear side oil circuit 525 is connected to the second gear bearing retaining portion 521. The oil CL stored in the tray portion 524 is supplied to the gear side oil circuit 525. Figure 2 As shown, a portion of the oil CL supplied to the gear-side oil passage 525 is supplied to the second gear bearing 342. Furthermore, another portion of the oil CL supplied to the gear-side oil passage 525 flows from the end portion on the +Y direction side of the transmission shaft 310 into the hollow portion 3101, flows in the -Y direction, and flows into the hollow portion 220 of the motor shaft 22.

[0101] The gear-side limiting component 526 limits the amount of oil CL supplied from the gear-side oil passage 525 to the second gear bearing 342. This limitation ensures that the oil CL is supplied from the gear-side oil passage 525 to the hollow portion 3101 of the transmission shaft 310 to the hollow portion 220 of the motor shaft 22. The gear-side limiting component 526 includes: an annular portion (reference numerals omitted) that is opposite to the second gear bearing 342 in the Y-axis direction; and a cylindrical portion (reference numerals omitted) that extends from the radial inner end portion of the annular portion in the -Y direction and is inserted into the interior of the transmission shaft 310. The annular portion has a through hole (reference numerals omitted) that passes through the annular portion in the Y-axis direction. The oil CL is supplied to the second gear bearing 342 through the through hole and is supplied to the interior of the transmission shaft 310 through the cylindrical portion.

[0102] <1-5. Motor side oil circuit>

[0103] Then, for example Figures 1 to 3 As shown, the housing 5 further includes a motor-side oil passage 55 through which oil CL flows. A portion of the motor-side oil passage 55 is disposed in the first housing member 51, and the remaining portion is disposed in the third housing member 53. The motor-side oil passage 55 is a passage through which oil CL, which is drawn up from the oil reservoir P of the gear housing 62 by the pump 4 and cooled by the oil cooler 8, flows to the motor unit 2.

[0104] The motor-side 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 , the second oil passage 552 , and the third oil passage 553 are formed in the first housing member 51 .

[0105] As described above, the first oil passage 551 connects the gear housing 62 and the suction port 41 of the pump 4 , particularly the vertically lower portion of the gear housing 62 and the suction port 41 of the pump 4 . In this embodiment, the first oil passage 551 is formed inside the side plate 512 .

[0106] The oil CL delivered from the pump 4 flows through the second oil passage 552 and the third oil passage 553. As described above, the motor-side oil passage 55 includes the second oil passage 552 and the third oil passage 553. The second oil passage 552 connects the discharge port 43 of the pump 4 and the oil cooler 8, supplying the oil CL discharged from the pump 4 to the oil cooler 8. The third oil passage 553 connects to the fourth oil passage 554 via a connecting flow passage 5531, described later. The second oil passage 552 and the third oil passage 553 are disposed on either the plate portion 5141 or the peripheral wall portion 5142.

[0107] The fourth oil passage 554 connects the third oil passage 553 and the motor housing 61. The fourth oil passage 554 is disposed within the third housing member 53. In other words, the fourth oil passage 554 is a through-hole formed in the third housing member 53. This allows the fourth oil passage 554 to be disposed without increasing the number of components in the drive device 1.

[0108] The motor-side oil passage 55 further includes a connecting flow passage 5531 . The connecting flow passage 5531 connects the second oil passage 552 , the third oil passage 553 , and the fourth oil passage 554 .

[0109] Next, the fourth oil passage 554 includes a first supply path 555, a second supply path 556, and a third supply path 557. The first supply path 555 is connected to the third oil passage 553 via a connecting flow path 5531. The second supply path 556 connects the first supply path 555 to the oil supply portion 558. The third supply path 557 connects the first supply path 555 to the hollow portion 220 of the motor shaft 22. Specifically, one end of the fourth oil passage 554 forms the first supply path 555, and the other end branches into the second supply path 556 and the third supply path 557.

[0110] In other words, the motor-side oil passage 55 includes a first supply path 555 . The oil CL supplied to the motor unit 2 flows through the first supply path 555 .

[0111] The motor-side oil passage 55 also includes a second supply path 556 and a third supply path 557. The second supply path 556 is connected to the oil supply portion 558 and supplies a portion of the oil CL flowing through the first supply path 555 to the outer surface of the stator 25. The third supply path 557 supplies the remaining portion of the oil CL flowing through the first supply path 555 to the hollow portion 220 of the motor shaft 22. The third supply path 557 also supplies oil CL to the first motor bearing 281.

[0112] The first supply path 555, the second supply path 556, and the third supply path 557 are provided in the third housing member 53. In this way, the first supply path 555, the second supply path 556, and the third supply path 557 can be arranged without increasing the number of parts of the drive device 1.

[0113] The second supply path 556 and the third supply path 557 extend in a direction intersecting the Y-axis direction. This can suppress an increase in the size of the third housing member 53 in the Y-axis direction due to the arrangement of the second supply path 556 and the third supply path 557.

[0114] The minimum flow path cross-sectional area of ​​the third supply path 557 is preferably smaller than the minimum flow path cross-sectional area of ​​the second supply path 556. This allows the oil CL flowing in the first supply path 555 to flow more easily into the second supply path 556 than into the third supply path 557. Therefore, even if the fluid pressure of the oil CL flowing in the motor-side oil passage 55 is not too high, a sufficient amount of oil CL can flow through the second supply path 556 and be supplied to the outer surface of the stator 25.

[0115] Next, the third supply path 557 is connected to the hollow portion 220 of the motor shaft 22 via the first motor bearing holding portion 531. As described above, 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 via the shaft hole portion 222 and the rotor communicating portion 231 (see Figure 5 ) is connected to the rotor through-hole 230. Specifically, the rotor through-hole 230 is connected to the third supply path 557 via the first motor bearing retaining portion 531 and the hollow portion 220. Therefore, when the rotor 21 rotates, 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, particularly the coil side end 271 of the stator 25.

[0116] Furthermore, the oil CL that has cooled the motor unit 2 accumulates in the lower portion of the motor housing 61 and then flows through the side plate opening 519 into the oil reservoir P in the lower portion of the gear housing 62. Specifically, the oil CL that is supplied from the second supply path 556 via the oil supply portion 558 to the radially outer surface of the stator 25 to cool the stator 25 accumulates in the lower portion of the motor housing 61 and then flows through the side plate opening 519 into the oil reservoir P in the lower portion of the gear housing 62. Furthermore, the oil CL that is supplied from the third supply path 557 via the rotor through-hole 230 to the coil end 271 and the like accumulates in the lower portion of the motor housing 61 and then flows through the side plate opening 519 into the oil reservoir P in the lower portion of the gear housing 62.

[0117] The third supply path 557 is provided with a supply limiting member 5571 (see Figure 1 and Figure 2 ). In the first motor bearing holding portion 531, the supply limiting member 5571 is arranged at the end portion on the -Y direction side of the shaft cylinder portion 221. The drive device 1 includes the supply limiting member 5571.

[0118] In this embodiment, the minimum flow path cross-sectional area of ​​the supply restriction member 5571 is smaller than the minimum flow path cross-sectional area of ​​the second supply path 556. This allows adjustment of the fluid pressure and flow rate of the oil CL supplied to the hollow portion 220 of the motor shaft 22.

[0119] <1-6. Oil supply unit 558>

[0120] Next, refer to Figures 7A to 9 Next, the oil supply portion 558 will be described. The oil supply portion 558 is arranged radially outward from the stator 25 and in the +Z direction relative to the rotation axis J2. Figure 7A It is a cross-sectional view showing a structural example of refueling portion 558 according to the embodiment. Figure 7BIt is a cross-sectional view showing a first modified example of the structure of refueling portion 558 . Figure 7C It is a cross-sectional view showing a second modified example of the structure of refueling portion 558 . Figure 8 This is a schematic structural diagram of the end portion on the +Y direction side of the oil supply portion 558 as viewed from the X-axis direction. Figure 9 This is a schematic structural diagram of the end portion of the oil supply portion 558 on the +Y direction side as viewed from the +Y direction to the -Y direction. Figures 7A to 7C The cross-sectional structure when the motor housing portion 61 is cut along a virtual plane perpendicular to the Y-axis direction is shown.

[0121] In this embodiment, if Figure 7A As shown, the oil supply portion 558 is in a tubular shape extending in the Y-axis direction and is housed in the motor housing portion 61 together with the motor portion 2. In this way, the oil supply portion 558 can be realized with a simple structure.

[0122] In addition, it is not limited to the examples of this embodiment. Figure 7B As shown, the oil supply portion 558 is a tray extending in the Y-axis direction, and can also be extended vertically upward (in Figure 7B The tray is stored in the motor storage portion 61 together with the motor portion 2. Even in this manner, the oil supply portion 558 can be realized with a simple structure.

[0123] Or, as Figure 7C As shown, the oil supply portion 558 may also be a part of the motor barrel 511. In this case, the oil flow path 5580 described later may also be arranged in the motor barrel 511. For example, the oil flow path 5580 may be a through hole formed inside the motor barrel 511 and extending in the Y-axis direction (see Figure 7C ), or a groove formed on the inner side of the motor barrel 511 and extending in the Y-axis direction. This eliminates the space occupied by the oil supply portion 558 within the motor housing 61 or reduces its size. This saves space within the motor housing 61 and allows the oil supply portion 558 to be implemented with a simple structure.

[0124] The oil supply portion 558 includes an oil flow path 5580 through which oil CL can flow. The oil flow path 5580 is an example of a "lubricating fluid flow path" according to the present invention. The end of the oil flow path 5580 on the -Y direction side is connected to the second supply path 556. In this embodiment, the end of the oil flow path 5580 on the +Y direction side is connected to the third gear bearing holder 518, and further connected to the insertion hole 5120 via the third gear bearing holder 518. In other words, the oil flow path 5580 is also connected to the second motor bearing holder 516 and the first gear bearing holder 517. This is not limited to the example of this embodiment; the oil flow path 5580 may be connected only to the third gear bearing holder 518 or directly to the second motor bearing holder 516 and the first gear bearing holder 517. In other words, the oil flow path 5580 only needs to be connected to at least one of the third gear bearing holder 518, the second motor bearing holder 516, and the first gear bearing holder 517.

[0125] The oil flow path 5580, through which oil CL supplied to the stator 25 flows, is connected to at least one of the third gear bearing retaining portion 518 that retains the third gear bearing 343, the first gear bearing retaining portion 517 that retains the first gear bearing 341, and the second motor bearing retaining portion 516 that retains the second motor bearing 282. Therefore, a portion of the oil CL flowing through the oil flow path 5580 is supplied to the stator 25, thereby cooling it. Furthermore, the remaining portion of the oil CL is used to cool and lubricate at least one of the third gear bearing 343, the first gear bearing 341, and the second motor bearing 282. Thus, with a simpler structure, the oil CL flowing through the oil flow path 5580 can be used to both cool the stator 25 and cool and lubricate at least one of the aforementioned bearings.

[0126] Preferably, the oil supply portion 558 includes a first oil supply portion 558a having a first oil flow path 5580a, and a second oil supply portion 558b having a second oil flow path 5580b. The oil flow path 5580 includes the first oil flow path 5580a and the second oil flow path 5580b. The first oil flow path 5580a is positioned closer to the +Y direction than the second oil flow path 5580b and is located on the +Y side of the oil supply portion 558. The -Y end of the second oil flow path 5580b is connected to the second supply path 556. The +Y end of the second oil flow path 5580b is connected to the -Y end of the first oil flow path 5580a. In this embodiment, the +Y end of the first oil flow path 5580a is connected to the third gear bearing retaining portion 518, and further connected to the insertion hole 5120 via the third gear bearing retaining portion 518. The cross-sectional area of ​​the first oil flow path 5580a is smaller than that of the second oil flow path 5580b. By making the cross-sectional area of ​​the first oil flow path 5580a, which is closer to the third gear bearing retaining portion 518 than the second oil flow path 5580b, smaller than that of the second oil flow path 5580b, the amount of oil CL supplied from the oil flow path 5580 to the third gear bearing retaining portion 518 can be adjusted. Therefore, a sufficient amount of oil CL supplied from the oil flow path 5580 to the stator 25 can be ensured, and oil CL can be supplied from the oil flow path 5580 to the third gear bearing retaining portion 518. Furthermore, the above example does not exclude a configuration in which the oil supply portion 558 does not include the first oil supply portion 558a and the second oil supply portion 558b, and in particular, a configuration in which the oil flow path 5580 does not include the first oil flow path 5580a and the second oil flow path 5580b.

[0127] The oil supply portion 558 also has a diffusion hole 5581. The diffusion hole 5581 is an example of a "first supply hole" according to the present invention. It extends from the oil flow path 5580 and opens toward the stator 25. Specifically, the diffusion hole 5581 radially penetrates the oil supply portion 558. The diffusion hole 5581 extends from the oil flow path 5580 to the exterior of the oil supply portion 558 and opens toward the outer side of the stator 25. This allows the oil CL flowing in the oil flow path 5580 to flow out of the diffusion hole 5581 toward the stator 25. Consequently, the stator 25 can be more reliably cooled by the oil CL.

[0128] The oil flow path 5580 and the intermediate axis J4 are positioned closer to the +Z direction than the rotation axis J2. When viewed in the Y-axis direction, the +Y-direction end of the oil flow path 5580 overlaps with the third gear bearing retaining portion 518. This allows the oil flow path 5580 to be positioned closer to the third gear bearing retaining portion 518, which rotatably supports the intermediate shaft 314 along the intermediate axis J4, when viewed in the Y-axis direction.

[0129] In addition, in this embodiment, the oil supply portion 558 further includes a supply hole 5582. The supply hole 5582 is an example of the "second supply hole" of the present invention. The supply hole 5582 is arranged at the end portion on the +Y direction side of the oil supply portion 558 and penetrates the oil supply portion 558. In this embodiment, the hole portion 5121 extends in the Y-axis direction, and the end portion on the +Y direction side of the oil supply portion 558 is inserted into the hole portion 5121 extending in the Y-axis direction (see Figure 1 (e.g., etc.) Furthermore, the +Y-side end of oil supply portion 558 is positioned closer in the +Y direction than the +Y-side end of supply hole 5582. Oil flow path 5580 is connected to third gear bearing holder 518 through supply hole 5582. This allows oil flow path 5580 to be connected to third gear bearing holder 518 with a simple structure.

[0130] However, this is not limited to the above example. The end of the oil supply portion 558 on the +Y direction side can be arranged at the same Y-axis direction position (i.e., coplanar) as the end of the supply hole 5582 on the +Y direction side, or can be arranged at a position closer to the -Y direction than the end of the supply hole 5582 on the +Y direction side.

[0131] In addition, the hole portion 5121 does not have to be a through hole extending in the Y-axis direction. Figure 10 This is a conceptual diagram showing another structural example of the hole portion 5121. Figure 10 In the embodiment, the hole portion 5121 is disposed within the side plate portion 512. The hole portion 5121 includes a first communication path 5122, a second communication path 5123, and a third communication path 5124. The first communication path 5122 is a space extending in the +Y direction from the end surface of the side plate portion 512 on the -Y direction side and is connected to the oil flow path 5580. The second communication path 5123 is a space extending in the -Y direction from the end surface of the side plate portion 512 on the +Y direction side and is connected to the third gear bearing retaining portion 518. The third communication path 5124 is a space extending in a direction intersecting the Y-axis direction and connects the +Y-side end of the first communication path 5122 with the -Y-side end of the second communication path 5123. This allows the oil flow path 5580 to be connected via the hole portion 5121 even if the +Y-side end is away from the third gear bearing retaining portion 518 in a direction intersecting the Y-axis direction when viewed from the Y-axis direction. This structure is particularly effective in a structure in which the oil flow path 5580 is directly connected to the insertion hole 5120 .

[0132] It is preferable that the +Y direction side of the oil supply portion 558 is fitted with the hole portion 5121. That is, the +Y direction side of the oil supply portion 558 is fitted with at least the -Y direction side of the hole portion 5121. For example, Figure 8In the case of the oil supply portion 558, the end portion on the +Y direction side is inserted through the hole portion 5121 and protrudes from the hole portion 5121 in the +Y direction. Alternatively, the end portion on the +Y direction side of the oil supply portion 558 may be closer to the -Y direction than the end portion on the +Y direction side of the hole portion 5121. Figure 10 , and engage with the first communication path 5122. At the engaging portion, the radially outer side of the oil supply portion 558 contacts the inner side of the hole 5121. This engagement secures the -Y-direction side of the oil supply portion 558 to the side plate 512. However, this example does not exclude configurations where the +Y-direction side of the oil supply portion 558 is not engaged with the hole 5121. For example, the oil flow path 5580 only needs to be connected to the hole 5121.

[0133] Here, it is preferred that the side plate portion 512 further includes a protrusion 5125 extending in the -Y direction. Specifically, the protrusion 5125 extends in the -Y direction on the end face of the side plate portion 512 on the -Y direction side. The hole portion 5121 penetrates the protrusion 5125 along the Y-axis direction. The protrusion 5125 is connected to the oil supply portion 558. For example, the oil supply portion 558 is inserted through or fitted into the hole portion 5121 at the end portion on the -Y direction side of the protrusion 5125, or is fixed to the end portion on the -Y direction side of the protrusion 5125 by welding, brazing, or the like. In this way, the portion on the +Y direction side of the oil supply portion 558 is easily connected to the hole portion 5121. In addition, when the portion on the +Y direction side of the oil supply portion 558 is inserted into or fitted into the hole portion 5121, the insertion or fitting becomes easy.

[0134] <1-7. Third Gear Bearing Retaining Portion 518>

[0135] Next, refer to Figure 8 and Figure 9 , describing the structure of the third gear bearing retaining portion 518.

[0136] The third gear bearing holding portion 518 has an annular outer side wall surface 5181 and an inner side wall surface 5182. The outer side wall surface 5181 and the inner side wall surface 5182 are surfaces facing the +Y direction. The -Y direction side end portion of the third gear bearing 343 is in contact with the outer side wall surface 5181. The inner side wall surface 5182 is disposed at a position inside the outer side wall surface 5181 when viewed in the Y axis direction, and is disposed at a position further in the -Y direction than the outer side wall surface 5181. At least a portion of the +Y direction side end portion of the oil flow path 5580 overlaps the inner side wall surface 5182 when viewed in the Y axis direction. In this way, by disposing the inner side wall surface 5182 at a position inside the outer side wall surface 5181, a gap can be formed between the -Y direction side end portion of the third gear bearing 343 and the inner side wall surface 5182. Therefore, by this gap, the oil CL flowing out from the oil flow path 5580 toward the third gear bearing holding portion 518 can be supplied to the -Y direction side end portion of the third gear bearing 343. Therefore, the third gear bearing 343 is easily and well lubricated.

[0137] In addition, the third gear bearing holding portion 518 also has a peripheral wall portion 5183. The peripheral wall portion 5183 is annular and surrounds the intermediate axis J4. The outer side surface of the third gear bearing 343 is in contact with the peripheral wall portion 5183. In addition, one end portion of the passage 5126 is connected to the peripheral wall portion 5183. That is, the passage 5126 penetrates the peripheral wall portion 5183 in the radial direction with the rotation axis J2 as a reference. In detail, the side plate portion 512 has the passage 5126. The passage 5126 is connected from the third gear bearing holder 51 to the first gear bearing holding portion 517 and the second motor bearing holding portion 516. In this way, a portion of the oil CL supplied to the third gear bearing holding portion 518 can be supplied to the first gear bearing holding portion 517 and the second motor bearing holding portion 516 through the passage 5126. Therefore, the first gear bearing 341 and the second motor bearing 282 can be cooled and lubricated by the oil CL supplied.

[0138] The third gear bearing retaining portion 518 also includes a guide portion 5184. The guide portion 5184 guides a portion of the oil CL supplied to the third gear bearing retaining portion 518 to the passage 5126. The guide portion 5184 is a step disposed on the inner wall surface 5182 of the third gear bearing retaining portion 518. The guide portion 5184 includes a first surface 51841, a second surface 51842, and a first guide surface 51843. The first surface 51841 and the second surface 51842 are each a portion of the inner wall surface 5182 and face the +Y direction. The first surface 51841 is positioned closer to the -Y direction than the second surface 51842 and closer to the +X direction than the second surface 51842. The +X direction is an example of "one direction" in the present invention and is the direction perpendicular to the Y-axis and Z-axis directions (i.e., the X-axis direction) from the intermediate axis J4 toward the rotation axis J2. The first guide surface 51843 connects the end of the first surface 51841 on the side of the second surface 51842 with the end of the second surface 51842 on the side of the first surface 51841. Furthermore, the first guide surface 51843 is connected to the passage 5126. In this embodiment, the vertically lower end of the first guide surface 51843 (i.e., the end on the -Z direction) is connected to the inner surface of the passage 5126. The first guide surface 51843 faces in at least one of the +X and +Z directions. By configuring the guide portion 5184 on the inner wall surface 5182, a portion of the oil CL supplied to the third gear bearing retaining portion 518 is guided by the first guide surface 51843 into the passage 5126, and then can be supplied through the passage 5126 to the first gear bearing retaining portion 517 and the second motor bearing retaining portion 516. Therefore, the oil CL can be efficiently supplied to the first gear bearing 341 and the second motor bearing 282.

[0139] At least a portion of the +Y-side end of the hole 5121 is disposed on the first surface 51841. In this embodiment, a portion of the +Y-side end of the hole 5121 is disposed on the first surface 51841, while the remaining portion is disposed on the outer wall surface 5181. Preferably, the remaining portion of the +Y-side end of the hole 5121 is not disposed on the second surface 51842. More preferably, the entire +Y-side end of the hole 5121 is disposed on the first surface 51841. This facilitates guiding a portion of the oil CL supplied to the third gear bearing retaining portion 518 to the first guide surface 51843.

[0140] Meanwhile, the other end of the passage 5126 is connected to the insertion hole 5120, and in this embodiment, is connected to the first gear bearing retaining portion 517. The first gear bearing retaining portion 517 includes a peripheral wall portion 5173. The peripheral wall portion 5173 is annular and surrounds the rotation axis J2. The outer surface of the first gear bearing 341 contacts the peripheral wall portion 5173. The passage 5126 penetrates the peripheral wall portion 5173 in a radial direction relative to the rotation axis J2.

[0141] The first gear bearing retaining portion 517 further includes an annular outer annular surface 5171 and an annular inner annular surface 5172. The outer annular surface 5171 and the inner annular surface 5172 each face the +Y direction and form an annular shape surrounding the rotation axis J2. The -Y-side end of the first gear bearing 341 contacts the outer annular surface 5171. The inner annular surface 5172 is positioned inward of the outer annular surface 5171 when viewed from the Y-axis direction and closer to the -Y direction than the outer annular surface 5171. Positioning the inner annular surface 5172 closer to the -Y direction than the outer annular surface 5171 creates a gap between the -Y-side end of the first gear bearing 341 and the inner annular surface 5172. This gap allows the oil CL supplied to the first gear bearing retaining portion 517 to be delivered to the -Y-side end of the first gear bearing 341. Therefore, the first gear bearing 341 can be easily and satisfactorily lubricated.

[0142] In addition, it is preferred that the passage 5126 has a second guide surface 51261. The second guide surface 51261 is a part of the inner surface of the passage 5126. In other words, the inner surface of the passage 5126 includes the second guide surface 51261. The second guide surface 51261 is arranged at a position closer to the -Y direction than the third gear bearing retaining portion 518, for example, closer to the -Y direction than the first surface 51841 of the inner wall surface 5182. In detail, the second guide surface 51261 is the inner side surface of the groove portion 51262 that is recessed in the -Y direction. The groove portion 51262 is arranged at least on the inner surface of the path 5126. In this embodiment, one end of the groove portion 51262 is arranged on the inner wall surface 5182 of the third gear bearing retaining portion 518. The other end of the groove portion 51262 is arranged on at least the outer annular surface 5171 of the first gear bearing retaining portion 517. Furthermore, the other end of groove portion 51262 may be further disposed on inner wall surface 5182. Second guide surface 51261 allows oil CL to be efficiently guided from first guide surface 51843 to the inner side surface of passage 5126. However, this example does not exclude a configuration in which passage 5126 does not include second guide surface 51261.

[0143] Further, it is preferable that the passage 5126 extends in a direction from one of the rotation axis J2 and the intermediate axis J4 toward the other, as viewed in the Y-axis direction. For example, the passage 5126 extends linearly in the above direction. In this way, the length of the passage 5126 can be further shortened, and thus the oil CL can be efficiently supplied from the third gear bearing holding portion 518 to the first gear bearing holding portion 517 through the passage 5126.

[0144] <2. Modification of the Embodiment>

[0145] Next, a modification of the embodiment will be described with reference to Figure 11 to the modification of the embodiment. Figure 11 is a schematic configuration view of the drive device 1 of the modification as viewed in the X-axis direction. Further, Figure 11 is a conceptual view, and the arrangement and size of each portion are not limited to be the same as those of the actual drive device 1. Hereinafter, a structure different from that of the above embodiment will be described. Further, the same reference numerals are attached to the same constituent elements as those of the above embodiment, and the description thereof will be omitted.

[0146] In the modification, the drive shaft Ds is inserted into the inside of the cylindrical output shaft 20 extending in the Y-axis direction and extends along the rotation axis J2. In detail, a portion of the drive shaft Ds, that is, a central portion in the Y-axis direction is arranged inside the output shaft 20. An end portion of the drive shaft Ds on the -Y direction side is arranged at a position on the -Y direction side from the output shaft 20. An end portion of the drive shaft Ds on the +Y direction side and the differential device 32 are arranged at positions on the +Y direction side from the output shaft 20. The drive shaft Ds is rotatable about the rotation axis J2. That is, the differential axis J5 coincides with the rotation axis J2. The drive device 1 includes the drive shaft Ds. As viewed in the Y-axis direction, the drive shaft Ds and the output shaft 20 are arranged in a concentric circular shape.

[0147] In detail, the portion of the drive shaft Ds on the -Y direction side is inserted into the inside of the motor shaft 22 and is arranged in a concentric circular shape with the shaft cylinder portion 221 as viewed in the Y-axis direction. Further, the first drive shaft through-hole 515 is provided to the third housing member 53. The third housing member 53 further has a first output bearing holding portion 532 and a first output bearing 5321. The first output bearing holding portion 532 is arranged to the first drive shaft through-hole 515 and rotatably supports the drive shaft Ds on the -Y direction side via the first output bearing 5321. The first output bearing holding portion 532 is connected to the third supply passage 557. Thus, the first output bearing 5321 is lubricated and cooled by the oil CL flowing in the third supply passage 557. Further, an oil seal (omitted from illustration) is arranged on the -Y direction side of the first output bearing holding portion 532.

[0148] The portion on the +Y direction side of the drive shaft Ds is inserted into the interior of the transmission shaft 310 and is arranged concentrically with the transmission shaft cylinder portion 3102 when viewed from the Y-axis direction. In addition, the differential device 32 is arranged at a position closer to the +Y direction than the transmission shaft 310. The second housing member 52 also has a second output bearing retaining portion 5231 and a second output bearing 5232. The second output bearing retaining portion 5231 is arranged in the second drive shaft through-hole 523 and supports the +Y direction side of the drive shaft Ds via the second output bearing 5232 so as to be rotatable. In addition, an oil seal (not shown) is arranged on the +Y direction side of the second output bearing retaining portion 5231.

[0149] The second gear bearing holding portion 521 rotatably holding the +Y direction end of the output shaft 20 is disposed closer to the −Y direction side than the differential device 32 and is supported by the side plate portion 512 or the gear cylinder portion 513 .

[0150] In the modification described above, the drive device 1 also includes a drive shaft Ds. The drive shaft Ds extends along the differential axis J5 extending in the Y-axis direction and can rotate around the differential axis J5. The gear portion 3 also has a differential device 32. The differential device 32 is mounted on the drive shaft Ds and transmits the torque of the fourth gear 321 to the drive shaft Ds. The output shaft 20 is cylindrical and extends in the Y-axis direction. A portion of the drive shaft Ds is arranged inside the output shaft 20. The end of the drive shaft Ds on the -Y direction side is arranged at a position closer to the -Y direction than the output shaft 20. The end of the drive shaft Ds on the +Y direction side and the differential device 32 are arranged at a position closer to the +Y direction than the output shaft 20.

[0151] This eliminates the need to secure space for arranging the drive shaft Ds and the differential device 32 radially outward from the output shaft 20. Consequently, the size of the drive device 1 in the direction perpendicular to the Y-axis direction can be further reduced. Consequently, the drive device 1 can be miniaturized.

[0152] Furthermore, when viewed from the Y-axis direction, the drive shaft Ds and the output shaft 20 are arranged concentrically. This provides a gap between the drive shaft Ds and the output shaft 20 in the radial direction relative to the rotation axis J2. This gap can be utilized as a flow path for the oil CL.

[0153] Furthermore, the differential axis J5 coincides with the rotation axis J2. By aligning the rotation centers of the drive shaft Ds and the output shaft 20, the gap between them in the radial direction relative to the rotation axis J2 can be kept constant. Consequently, the oil CL can flow through this gap without changing the flow rate or flow resistance.

[0154] <3. Other>

[0155] The above describes the embodiments of the present invention. In addition, the scope of the present invention is not limited to the above embodiments. The present invention can be implemented by adding various changes to the above embodiments without departing from the scope of the invention. In addition, the matters described in the above embodiments can be appropriately combined in any manner within the scope that does not cause contradictions.

[0156] The present invention is useful in drive motors for vehicles such as hybrid vehicles (HVs), plug-in hybrid vehicles (PHVs), and electric vehicles (EVs).

Claims

1. A driving device, wherein: The driving device comprises: a first shaft extending along a first rotation axis extending in an axial direction and rotatable about the first rotation axis; a rotor supported on the first shaft and rotatable together with the first shaft; a stator, the stator being arranged radially outward of the rotor; a gear portion connected to one axial end portion of the first shaft; a lubricating liquid supply portion, the lubricating liquid supply portion being arranged radially outward of the stator and supplying lubricating liquid to the stator; and a housing that houses the rotor, the stator, the lubricating fluid supply unit, and the gear unit; The gear portion has a second shaft extending along a second rotation axis extending in the axial direction, The housing has: a motor barrel portion, the motor barrel portion extending in the axial direction; a gear cylinder portion, the gear cylinder portion being arranged at a position closer to one side in the axial direction than the motor cylinder portion and extending in the axial direction; a side plate portion extending in a direction intersecting the axial direction and dividing the motor cylinder portion and the gear cylinder portion; a motor housing portion, the motor housing portion being surrounded by the motor cylinder portion and the side plate portion and housing the rotor and the stator; and a gear housing portion, the gear housing portion being surrounded by the gear cylinder portion and the side plate portion and housing the gear portion; The side plate portion has a first bearing holding portion and a second bearing holding portion, The first bearing holding portion rotatably supports the first shaft via a first bearing. The second bearing holding portion rotatably supports the second shaft via the second bearing. The lubricating liquid supply portion has a lubricating liquid flow path through which the lubricating liquid can flow. The lubricating fluid flow path is connected to at least one of the first bearing holding portion and the second bearing holding portion. The side plate portion further has a hole portion that penetrates the side plate portion in the axial direction and is connected to the second bearing holding portion. The lubricating liquid supply portion and the hole portion overlap in the axial direction, The lubricating liquid supply portion has a second supply hole, which is arranged at one axial end portion of the lubricating liquid supply portion and penetrates the lubricating liquid supply portion. The lubricating fluid flow path is connected to the second bearing holding portion through the second supply hole.

2. The driving device according to claim 1, wherein: The lubricating liquid supply portion further has a first supply hole; The first supply hole extends from the lubricating fluid flow path and opens toward the stator.

3. The driving device according to claim 1 or 2, wherein: The lubricating fluid flow path is arranged in the motor cylinder.

4. The driving device according to claim 1 or 2, wherein: The lubricating liquid supply portion is a tray extending in the axial direction and opening vertically upward.

5. The driving device according to claim 2, wherein: The lubricating liquid supply portion is in a tubular shape extending in the axial direction.

6. The driving device according to claim 1 or 2, wherein: The gear unit further comprises: a first gear fixed to a radially outer surface of the first shaft; a second gear and a third gear fixed to a radially outer side of the second shaft; and a fourth gear rotatable about a third rotation axis extending in the axial direction, The second gear meshes with the first gear, The third gear is meshed with the fourth gear, The second rotation axis is arranged vertically above the first rotation axis and the third rotation axis.

7. The driving device according to claim 1 or 2, wherein: The lubricating fluid flow path and the second rotation axis are arranged vertically above the first rotation axis. When viewed in the axial direction, one axial end portion of the lubricating fluid flow path overlaps with the second bearing holding portion.

8. The driving device according to claim 1 or 2, wherein: One axial end portion of the lubricating liquid supply portion is inserted into the hole portion.

9. The driving device according to claim 1 or 2, wherein: The side plate portion further includes a hole portion disposed inside the side plate portion. The hole portion includes a first communication path, a second communication path, and a third communication path, The first communication path is a space extending from the other axial end surface of the side plate portion to one axial side and is connected to the lubricating fluid flow path. The second communication path is a space extending from one axial end surface of the side plate portion to the other axial side and connected to the second bearing holding portion. The third communication path is a space extending in a direction intersecting the axial direction, and connects one axial end portion of the first communication path and the other axial end portion of the second communication path.

10. The driving device according to claim 8, wherein One axial side of the lubricating liquid supply portion is fitted into the hole portion.

11. The driving device according to claim 8, wherein: The side plate portion also has a protrusion extending toward the other side in the axial direction. The hole portion penetrates the protrusion portion in the axial direction, The protrusion is connected to the lubricating liquid supply portion.

12. The driving device according to claim 1 or 2, wherein: The second bearing holding portion has an annular outer wall surface and an inner wall surface. The outer wall surface and the inner wall surface are surfaces facing one side in the axial direction, The other axial end portion of the second bearing contacts the outer wall surface. The inner wall surface is arranged at a position inward of the outer wall surface when viewed from the axial direction, and is arranged at a position on the other side of the axial direction than the outer wall surface. When viewed in the axial direction, at least a portion of one axial end portion of the lubricating fluid flow path overlaps with the inner wall surface.

13. The driving device according to claim 1 or 2, wherein: The side plate portion further includes a passage connecting the second bearing holding portion to the first bearing holding portion.

14. The driving device according to claim 12, wherein: The side plate portion further has a passage connecting the second bearing holding portion with the first bearing holding portion. The second bearing holding portion further includes a guide portion that guides a portion of the lubricating fluid supplied to the second bearing holding portion to the passage. The guide portion has a first surface, a second surface and a first guide surface, The first surface and the second surface are respectively part of the inner wall surface, The first surface is arranged at a position closer to the other side of the axial direction than the second surface, and is arranged closer to the second surface in one direction. The one direction is a direction perpendicular to the axial direction and the vertical direction, from the second rotation axis toward the first rotation axis. The first guide surface connects an end portion of the first surface on the second surface side and an end portion of the second surface on the first surface side, and is connected to the passage.

15. The driving device according to claim 14, wherein: At least a portion of one axial end portion of the hole is arranged on the first surface.

16. The driving device according to claim 13, wherein: The first bearing holding portion has an annular outer annular surface and an annular inner annular surface. The outer annular surface and the inner annular surface are surfaces facing one side in the axial direction, The other axial end portion of the first bearing contacts the outer annular surface. The inner annular surface is arranged inward of the annular outer annular surface when viewed in the axial direction, and is arranged on the other axial side of the outer annular surface.

17. The driving device according to claim 13, wherein: The inner side surface of the passage includes a second guide surface disposed on the other side in the axial direction relative to the second bearing holding portion.

18. The driving device according to claim 13, wherein: The passage extends in a direction from one toward the other of the first rotation axis and the second rotation axis when viewed in the axial direction.

19. The driving device according to claim 1 or 2, wherein: The lubricating fluid flow path includes a first lubricating fluid flow path and a second lubricating fluid flow path. The first lubricating fluid flow path is arranged at a position closer to one side in the axial direction than the second lubricating fluid flow path, and is arranged at one side in the axial direction of the lubricating fluid supply portion. A flow path cross-sectional area of ​​the first lubricating fluid flow path is smaller than a flow path cross-sectional area of ​​the second lubricating fluid flow path.

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