Drive device

Abstract

A drive device that can be configured more compactly. The partition wall of the drive device has a first partition wall and a second partition wall. The first partition wall extends in a direction intersecting the axial direction and covers one axial end of the motor housing. The second partition wall extends in a direction intersecting the axial direction and is configured to be closer to the side of the first direction perpendicular to the axial direction than the first partition wall, and covers the other axial end of the gear housing together with the first partition wall. The second partition wall is configured to be closer to the axial side than the first partition wall.

Description

Technical Field

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

[0002] In the past, a drive device is known that reduces the torque of a motor at a predetermined reduction ratio and transmits it to a drive shaft. For example, the drive device is integrally constituted by a motor, a transmission linked to the motor, and a controller. (For example, refer to International Publication No. 2019 / 154155)

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2019 / 154155 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, in recent years, there is a demand for a more compact drive device. For example, when the drive device is arranged at the rear of the electric vehicle, it is required to further reduce the size of the drive device in the vertical direction. In the above drive device, the controller is arranged above the transmission, so it is difficult to reduce the size of the drive device in the vertical direction to meet the above requirements.

[0008] An object of the present invention is to provide a technology capable of configuring a driving device more compactly.

[0009] Technical solutions adopted to solve technical problems

[0010] An exemplary drive device of the present invention includes a motor unit, a gear unit and a housing. The motor unit has a rotor and a stator. The rotor has a motor shaft. The motor shaft can rotate around a first rotating shaft extending in an axial direction. The stator is arranged radially outward from the rotor. The gear unit is located at one axial end of the motor unit. The housing accommodates the motor unit and the gear unit. The gear unit has a first shaft, a first gear, a second gear, a third gear and a fourth gear. The first shaft is connected to the motor shaft. The first gear is located on the radially outer side of the first shaft. The second gear and the third gear are located on the radially outer side of the first shaft extending in the axial direction and can rotate around a second rotating shaft extending in the axial direction. The fourth gear can rotate around a third rotating shaft extending in the axial direction. The second gear is arranged on the other side of the axial direction than the third gear and meshes with the first gear. The third gear meshes with the fourth gear. The pitch circle diameter of the second gear is larger than the pitch circle diameter of the third gear. The third rotating shaft is arranged on one side of the first direction perpendicular to the axial direction than the first rotating shaft. The housing includes a motor housing, a gear housing, a partition wall, and an inverter housing. The motor housing is in the shape of a tube extending in the axial direction and accommodates the motor part. The gear housing is in the shape of a tube extending in the axial direction and accommodates the gear part. The partition wall divides the motor housing and the gear housing. The inverter housing accommodates an inverter unit electrically connected to the stator. The fourth gear is arranged on one side of the axial direction than the inverter housing. The first rotating shaft is arranged on the other side of the first direction than the inverter housing. The third rotating shaft is arranged on one side of the second direction perpendicular to the axial direction and the first direction than the inverter housing. The partition wall includes a first partition wall and a second partition wall. The first partition wall extends in a direction intersecting the axial direction and covers one axial end of the motor housing. The second partition wall extends in a direction intersecting the axial direction and is arranged on one side of the first direction than the first partition wall, and covers the other axial end of the gear housing together with the first partition wall. The second partition wall is arranged on one side of the axial direction than the first partition wall.

[0011] Effects of the Invention

[0012] According to the exemplary driving device of the present invention, it is possible to provide a technique for configuring the driving device more compactly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the drive device as viewed from the Z-axis direction.

[0014] Figure 2 This is a schematic diagram of the drive device as viewed from the X-axis direction.

[0015] Figure 3This is a schematic diagram showing an example of a vehicle including a drive device.

[0016] Figure 4 It is a three-dimensional diagram of the shell.

[0017] Figure 5 It is an exploded perspective view of the housing.

[0018] (Explanation of symbols)

[0019] 100 driving device; 1 motor part; 10 output shaft; 11 rotor; 111 motor shaft; 1111 shaft tube part; 1112 hollow part; 1113 shaft hole part; 112 rotor core; 1121 rotor through hole; 1122 rotor connecting part; 113 magnet; 12 stator; 121 stator core; 122 coil; 1221 coil end; 2 gear part; 21 speed reducer; 211 first gear; 212 second gear; 213 third gear; 214 first shaft; 2141 shaft cylinder; 2142 hollow portion; 215 second shaft; 22 differential device; 221 fourth gear; 2211 tooth; 222 differential device housing; 3 housing; 301 motor housing; 302 gear housing; 303 inverter housing; 31 housing body; 311 motor housing; 312 gear housing; 313 partition wall; 314 inverter housing; 3141 bottom plate; 3142 peripheral wall; 32 first cover; 321 second gear bearing holding portion; 3211 second gear bearing; 322 second intermediate bearing retaining portion; 3221 second intermediate bearing; 323 second drive shaft through hole; 324 receiving disk portion; 3241 supply hole; 325 gear side oil passage; 326 gear side limiting member; 33 second cover portion; 331 second motor bearing retaining portion; 3311 second motor bearing; 34 third cover portion; 4 first partition wall; 41 insertion hole; 42 first motor bearing retaining portion; 421 first motor bearing; 43 first gear bearing retaining portion part; 431 first gear bearing; 44 first intermediate bearing retaining portion; 441 first intermediate bearing; 45 partition wall opening; 5 second partition wall; 51 first drive shaft through hole; 52 differential device accommodating portion; 6 inverter unit; 7 pump; 71 motor side oil circuit; 72 oil supply portion; 721 supply hole; 8 oil cooler; CL oil; Ds drive shaft; J1 rotation axis; J2 intermediate axis; J3 differential axis; P oil storage portion; RE refrigerant; 200 vehicle; 150 battery. DETAILED DESCRIPTION

[0020] Hereinafter, exemplary embodiments will be described with reference to the drawings.

[0021] In the following description, the gravity direction is defined based on the positional relationship when the drive device 100 is installed on the vehicle 200 located on a horizontal road. In addition, in the accompanying drawings, an XYZ coordinate system is appropriately shown 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 (vertically upward in the opposite direction to the gravity direction), and the -Z direction is downward (vertically downward in the same direction as the gravity direction). In addition, the "Z-axis direction" in the following description is an example of the "second direction" of the present invention. In addition, the "-Z direction" is an example of "one side of the second direction" of the present invention, and the "+Z direction" is an example of "the other side of the second direction" of the present invention.

[0022] In addition, the X-axis direction is a direction orthogonal to the Z-axis direction, and indicates the front-rear direction of the vehicle 200 on which the drive device 100 is installed. The +X direction is the front of the vehicle 200, and the -X direction is the rear of the vehicle 200. However, the +X direction may be the rear of the vehicle 200, and the -X direction may be the front of the vehicle 200. In addition, the "X-axis direction" in the following description is an example of the "first direction" of the present invention. In addition, the "+X direction" is an example of the "one side of the first direction" of the present invention, and the "-X direction" is an example of the "other side of the first direction" of the present invention.

[0023] The Y-axis direction is a direction orthogonal 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 side of the vehicle 200, and the +Y direction is the right side of the vehicle 200. However, in the case where the +X direction is the rear side of the vehicle 200, the +Y direction may be the left side of the vehicle 200, and the -Y direction may be the right side of the vehicle 200. That is, regardless of the X-axis direction, it is only recorded that 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 installation method of the drive device 100 relative to the vehicle 200, the X-axis direction may be the width direction (left-right direction) of the vehicle 200, and the Y-axis direction may be the front-rear direction of the vehicle 200. In the following embodiment, the Y-axis direction is parallel to, for example, the rotation axis J1 of the motor unit 1. In addition, the "Y-axis direction" in the following description is an example of the "axial direction" of the present invention. Furthermore, 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.

[0024] In the following description, unless otherwise specified, the direction parallel to a specified axis such as the rotation axis J1 of the motor unit 1 (Y-axis direction) 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 structural element, the radially inner end is referred to as the "radial inner end". In addition, the outer end is referred to as the "radial outer end". In addition, in the side surfaces of each structural element, 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".

[0025] In addition, these names are used only for explanation, and are not intended to limit actual positional relationships, directions, names, etc.

[0026] Moreover, in the following description, in the positional relationship between any one of the orientations, lines and planes and any other one, "parallel" includes not only a state where the two extend to any place and do not intersect at all, but also a state where they are substantially parallel. In addition, "perpendicular" and "orthogonal" include not only a state where the two intersect each other at 90 degrees, but also a state where they are substantially perpendicular and a state where they are substantially orthogonal. In other words, "parallel", "perpendicular" and "orthogonal" include respectively a state where there is an angular deviation in the positional relationship between the two to a degree that does not deviate from the gist of the present invention.

[0027] <1. Driving device 100 >

[0028] Figure 1 This is a schematic structural diagram of the driving device 100 as viewed from the Z-axis direction. Figure 2 This is a schematic structural diagram of the driving device 100 as viewed from the X-axis direction. Figure 3 1 is a schematic diagram showing an example of a vehicle 200 having the drive device 100. Figure 1 and Figure 2 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 100 .

[0029] The driving device 100 is installed in 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 3 ). The drive device 100 is used as a power source of the vehicle 200. The vehicle 200 includes the drive device 100 and a battery 150. The battery 150 stores electric power for supplying to the drive device 100. Taking the vehicle 200 as an example, the drive device 100 drives the left and right front wheels. In addition, the drive device 100 only needs to drive at least any wheel.

[0030] The drive device 100 includes an output shaft 10. The output shaft 10 extends along a rotation axis J1 extending in the Y-axis direction and can rotate around the rotation axis J1. The output shaft 10 is composed of a motor shaft 111 and a first shaft 214. In addition, the drive device 100 includes a motor unit 1, a gear unit 2 and a housing 3. The motor unit 1 has a rotor 11 and a stator 12. The rotor 11 has a motor shaft 111. The motor shaft 111 can rotate around the rotation axis J1 extending in the Y-axis direction. In addition, the rotation axis J1 is an example of the "first rotating shaft" of the present invention. The stator 12 is arranged radially outward of the rotor 11. The gear unit 2 is located at the end of the motor unit 1 on the +Y direction side. The housing 3 accommodates the motor unit 1 and the gear unit 2.

[0031] Furthermore, the drive device 100 further includes an inverter unit 6, a pump 7, and an oil cooler 8. The inverter unit 6 supplies driving power to the motor unit 1. The pump 7 supplies the oil CL accommodated in the housing 3 to the motor unit 1. The oil cooler 8 cools the oil CL.

[0032] Furthermore, a housing space for housing the motor unit 1, the gear unit 2, the pump 7, and the inverter unit 6 is provided inside the housing 3. The housing space is divided into a motor housing portion 301, a gear housing portion 302, and an inverter housing portion 303. In other words, the housing 3 has a motor housing portion 301, a gear housing portion 302, and an inverter housing portion 303. The motor housing portion 301 houses the motor unit 1. The gear housing portion 302 houses the gear unit 2. The gear housing portion 302 has an oil storage portion P for storing oil CL at the lower part in the vertical direction. The motor housing portion 301 and the gear housing portion 302 are divided by a partition wall 313 described later. The inverter housing portion 303 houses the inverter unit 6.

[0033] <1-1. Motor section 1>

[0034] Next, refer to Figure 1 to Figure 2 , the motor unit 1 is described.

[0035] <1-1-1. Rotor 11>

[0036] The rotor 11 rotates about a rotation axis J1 extending in the horizontal direction when power is supplied from a battery (not shown) to the stator 12. In the present embodiment, the rotation axis J1 is disposed on the -X direction side relative to the inverter housing 314.

[0037] As described above, the rotor 11 has a motor shaft 111. The motor shaft 111 extends along the rotation axis J1. The hollow first shaft 214 described later is inserted through and connected to the end of the motor shaft 111 on the +Y direction side. In this embodiment, the two are splined. However, it is not limited to the example of this embodiment, and the two can also be connected by threaded coupling using male and female threads, or can be joined by a fixing method such as welding.

[0038] The motor shaft 111 is a hollow shaft in a cylindrical shape. The motor shaft 111 has a shaft barrel portion 1111, a hollow portion 1112, and a shaft hole portion 1113. The shaft barrel portion 1111 is in a cylindrical shape extending in the Y-axis direction. The hollow portion 1112 is connected to the hollow portion 2142 of the first shaft 214 described later at the end portion on the +Y direction side of the shaft barrel portion 1111, and is connected to the gear side oil passage 325 described later via the hollow portion 2142. The shaft hole portion 1113 penetrates the shaft barrel portion 1111 in the radial direction.

[0039] The rotor 11 also has a rotor core 112 and magnets 113. The rotor core 112 is a cylindrical body extending in the Y-axis direction. The rotor core 112 is fixed to the radially outer side of the motor shaft 111. A plurality of magnets 113 are fixed at the radially outer end of the rotor core 112. The plurality of magnets 113 arrange magnetic poles alternately in the circumferential direction.

[0040] The rotor core 112 has a rotor through hole 1121 and a rotor communicating portion 1122. The rotor through hole 1121 penetrates the rotor core 112 in the Y-axis direction and is connected to the shaft hole 1113. The rotor through hole 1121 is connected to the gear side oil passage 325 via the hollow portion 1112 and the hollow portion 2142. The rotor communicating portion 1122 is a space that penetrates from the radial inner side surface of the rotor core 112 to the rotor through hole 1121, and connects the rotor through hole 1121 to the shaft hole 1113. The rotor through hole 1121 is used as a flow path for the oil CL that cools the rotor 11 from the inside. The oil CL that flows in the hollow portion 1112 of the motor shaft 111 can flow into the rotor through hole 1121 via the shaft hole 1113 and the rotor communicating portion 1122 as described later. In this way, when the rotor 11 rotates, the oil CL flows out from the ends of the rotor through hole 1121 on both sides in the Y-axis direction. The oil CL is supplied to the Y-axis end of the stator 12, particularly to the coil side end 1221, which is arranged at the Y-axis end of the stator 12, by the centrifugal force generated by the rotation of the rotor 11. The Y-axis end of the stator 12, particularly the coil side end 1221 of the stator 12, can be cooled by the oil CL.

[0041] <1-1-2. Stator 12>

[0042] The stator 12 surrounds the rotor 11 from the radially outer side and drives the rotor 11 to rotate. The stator 12 is held by the housing 3. As described above, the stator 12 is arranged radially outward from the rotor 11. That is, the motor unit 1 is an inner rotor type motor in which the rotor 11 is rotatably arranged inside the stator 12.

[0043] The stator 12 has a stator core 121, a coil 122 and an insulating member (not shown in the figure), and the insulating member is arranged between the stator core 121 and the coil 122. The stator core 121 has a plurality of magnetic pole teeth (not shown in the figure) on the radial inner side. Coil wire is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes the coil 122. The coil wire is connected to the inverter unit 6 via a busbar (not shown in the figure). The coil 122 has a coil side end 1221 protruding from the end face of the stator core 121 in the Y-axis direction. In the Y-axis direction, the coil side end 1221 protrudes further outward than the end of the rotor core 112 of the rotor 11.

[0044] <1-2. Gear unit 2>

[0045] Next, refer to Figure 1 to Figure 2 Next, the gear unit 2 will be described. The gear unit 2 transmits the driving force of the motor unit 1 to the drive shaft Ds that drives the wheels of the vehicle 200. The gear unit 2 includes a speed reduction device 21 and a differential device 22.

[0046] <1-2-1. Speed ​​reduction device 21>

[0047] The reduction gear 21 is connected to the end portion on the +Y direction side of the motor shaft 111 , and reduces the rotation speed of the motor unit 1 according to the reduction ratio to increase the torque output from the motor unit 1 , and transmits the torque to the differential device 22 .

[0048] The reduction gear 21 has a first gear (intermediate driving gear) 211, a second gear (intermediate gear) 212, a third gear (final driving gear) 213 and a first shaft 214. In other words, the gear unit 2 has a first shaft 214, a first gear 211, a second gear 212 and a third gear 213. The first shaft 214 is connected to the motor shaft 111. The first gear 211 is located on the radial outer side of the first shaft 214. The second gear 212 and the third gear 213 are located on the radial outer side of the second shaft 215 extending in the Y-axis direction, and can rotate around the intermediate axis J2 extending in the Y-axis direction. In addition, the intermediate axis J2 is an example of the "second rotating shaft" of the present invention. Moreover, the reduction gear 21 also has a second shaft 215. The second shaft 215 extends along the intermediate axis J2. The gear unit 2 also has a second shaft 215. The second gear 212 and the third gear 213 are located on the radial outer side of the second shaft 215.

[0049] The torque output from the motor unit 1 is transmitted to the fourth gear 221 described later of the differential device 22 via the motor shaft 111, the first shaft 214, the first gear 211, the second gear 212, the second shaft 215 and the third gear 213. In this way, the reduction gear 21 transmits the torque output from the motor unit 1 to the differential device 22. The gear ratio of each gear and the number of gears can be changed in various ways according to the required reduction ratio. The reduction gear 21 is a parallel axis gear type reducer in which the axis cores of each gear are arranged in parallel.

[0050] The first shaft 214 extends along the Y-axis direction with the rotation axis J1 as the center, and rotates together with the motor shaft 111 with the rotation axis J1 as the center. The first shaft 214 is a cylindrical hollow shaft. The first shaft 214 has a shaft cylinder portion 2141 and a hollow portion 2142. The shaft cylinder portion 2141 is cylindrical and extends along the Y-axis direction. The hollow portion 2142 is surrounded by the inner side surface of the shaft cylinder portion 2141, and is connected to the gear side oil passage 325 described later at the end on the +Y direction side of the shaft cylinder portion 2141. The end on the -Y direction side of the shaft cylinder portion 2141 is connected to the end on the +Y direction side of the motor shaft 111.

[0051] In addition, the first shaft 214 may be the same member as the motor shaft 111, that is, integral with the motor shaft 111, without being limited to the examples of the present embodiment. In other words, the output shaft 10 may be a single hollow shaft extending across the motor housing portion 301 and the gear housing portion 302. In this case, the end portion of the output shaft 10 on the +Y direction side protrudes toward the gear housing portion 302, and is supported by the second gear bearing retaining portion 321 via the second gear bearing 3211 so as to be rotatable. Moreover, the interior of the output shaft 10 is connected to the second motor bearing retaining portion 331 and the second gear bearing retaining portion 321.

[0052] The first gear 211 is located on the radially outer side of the first shaft 214. The first gear 211 can rotate together with the first shaft 214 around the rotation axis J1. The first gear 211 can be a component that is integral with the first shaft 214, or can be a different component. In the case where the first gear 211 and the first shaft 214 are different components, the first gear 211 and the first shaft 214 are firmly fixed by heat-fitting or the like.

[0053] The second gear 212 and the third gear 213 are connected via the second shaft 215. The second gear 212 and the third gear 213 can rotate around the intermediate axis J2. The second gear 212 is configured to be closer to the -Y direction side than the third gear 213, and meshes with the first gear 211. The third gear 213 meshes with the fourth gear 221 described later. The pitch circle diameter of the second gear 212 is larger than the pitch circle diameter of the third gear 213. The second gear 212 and the third gear 213 can be components that are integral with the second shaft 215, or can be different components. In the case where at least either one of the second gear 212 and the third gear 213 is a component that is different from the second shaft 215, the two are firmly fixed by heat fitting or the like.

[0054] The second shaft 215 extends along the intermediate axis J2. The intermediate axis J2 is parallel to the rotation axis J1 and extends in the Y-axis direction. The end of the second shaft 215 on the -Y direction side is rotatably supported by the partition wall 313 of the housing 3. The end of the second shaft 215 on the +Y direction side is rotatably supported by the first cover 32.

[0055] The intermediate axis J2 is configured to be closer to the -Z direction side than the rotation axis J1. In addition, the intermediate axis J2 is configured to be closer to the -Z direction side than the differential axis J3 described later. In this way, the second gear 212 that can rotate around the intermediate axis J2 can be configured to be closer to the -Z direction side, thereby preventing the second gear 212 from obstructing the configuration of the inverter housing 314 in the Z-axis direction. Therefore, the inverter housing 314 can be configured to be closer to the -Z direction side. Therefore, the size of the drive device 100 in the Z-axis direction can be further reduced, making the drive device 100 more compact.

[0056] Furthermore, by disposing the intermediate axis J2 as described above, the differential axis J3 can be brought closer to the rotation axis J1 in the X-axis direction. Therefore, the size of the drive device 100 in the X-axis direction can be reduced.

[0057] Moreover, the intermediate axis J2 is configured to be closer to the -Z direction side perpendicular to the Y-axis direction and the X-axis direction than the inverter housing 314. In addition, the -Z direction is one side of the Z-axis direction and is perpendicular to the Y-axis direction and the X-axis direction. The intermediate axis J2 of the second shaft 215 is configured to be closer to the -Z direction side than both the rotation axis J1 of the output shaft 10 and the differential axis J3 of the fourth gear 221, so that the interval between the output shaft 10 and the fourth gear 221 can be further shortened in the X-axis direction. Therefore, the gear housing portion 302 that houses the gear portion 2 can be made more compact in the X-axis direction. Therefore, the drive device 100 can be miniaturized.

[0058] <1-2-2. Differential device 22>

[0059] The differential device 22 is mounted on the drive shaft Ds. The gear unit 2 has a drive shaft Ds and a differential device 22. The drive shaft Ds extends from the differential device 22 in the Y-axis direction. The differential device 22 transmits the torque of the motor unit 1 to the drive shaft Ds. The drive shaft Ds is respectively arranged on the +Y direction side and the -Y direction side of the differential device 22. The left and right wheels of the vehicle 200 are mounted on the respective drive shafts Ds. The differential device 22 absorbs the rotation speed difference between the left and right wheels (drive shaft Ds) when the vehicle 200 turns, for example, and transmits torque to the left and right drive shafts Ds.

[0060] The drive shaft Ds is located on the -Z direction side of the inverter housing 314. This prevents the drive shaft Ds from interfering with the arrangement of the inverter housing 314 in the Z-axis direction.

[0061] The differential device 22 includes a fourth gear 221 , a differential device case 222 , a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

[0062] The fourth gear 221 is a ring gear of the differential device 22. The fourth gear 221 has a plurality of teeth 2211. The plurality of teeth 2211 are arranged at the radial outer end of the fourth gear 221 and are arranged in the circumferential direction. The teeth 2211 mesh with the teeth of the third gear 213. The teeth 2211 are located closer to the -Y direction than the end on the +Y direction side of the differential device 22, and are located closer to the +Y direction than the end on the -Y direction side of the differential device 22. In the Y-axis direction, the interval between the end on the -Y direction side of the teeth 2211 of the fourth gear 221 and the end on the -Y direction side of the differential device 22 is greater than the interval between the end on the +Y direction side of the teeth 2211 and the end on the +Y direction side of the differential device 22. In this way, the differential device 22 can be arranged closer to the -Y direction side (i.e., the side opposite to the first cover portion 32 in the Y-axis direction) relative to the fourth gear 221. Therefore, it is possible to further reduce the space occupied by the differential device 22 on the +Y direction side relative to the fourth gear 221. Therefore, it is possible to further reduce the size of the drive device 100 in the Y-axis direction.

[0063] Preferably, when viewed along the X-axis direction, at least a portion of the second gear 212 overlaps with the differential device 22. In this way, the -Y direction side of the differential device 22 can be arranged at the rear of the second gear 212, so that the differential device 22 can be arranged closer to the -Y direction. Therefore, the size of the drive device 100 in the Y-axis direction can be further reduced.

[0064] The fourth gear 221 is configured to be closer to the +Y direction side than the inverter housing 314. The gear unit 2 has a fourth gear 221. The fourth gear 221 can rotate around the differential axis J3 extending along the Y-axis direction. In addition, the differential axis J3 is an example of the "third rotating shaft" of the present invention. The differential axis J3 is configured to be closer to the side of the X-axis direction perpendicular to the Y-axis direction than the rotation axis J1 (the +X direction side in this embodiment). The torque output from the motor unit 1 is transmitted to the fourth gear 221 via the reduction device 21. The differential device 22 transmits the torque of the fourth gear 221 to the drive shaft Ds.

[0065] Moreover, the lower portion of the fourth gear 221 (i.e., the portion on the -Z direction side) is immersed in the lower oil reservoir P in the gear housing portion 302. For example, when the fourth gear 221 of the differential device 22 rotates, the oil CL is lifted up by the tooth surface of the fourth gear 221. A portion of the above oil is supplied to the interior of the gear housing portion 302 to lubricate the gears and bearings of the reduction gear 21 and the differential device 22 in the gear housing portion 302. Moreover, another portion of the lifted oil CL is supplied to the hollow portion 1112 of the motor shaft 111 through the gear side oil passage 325 and the hollow portion 2142 of the first shaft 214 after being accumulated in the receiving tray portion 324 described later, and is used to cool the stator 12.

[0066] The pitch circle diameter of the fourth gear 221 is larger than the pitch circle diameter of the second gear 212. In this way, the pitch circle diameter of the fourth gear 221 can be further increased, and therefore, the reduction ratio of the torque transmitted from the motor unit 1 to the fourth gear 221 via the first gear 211, the second gear 212, and the third gear 213 can be further increased. In addition, when the oil CL is accumulated in the lower part of the gear housing 302, it is easy to configure the fourth gear 221 so that the lower part of the fourth gear 221 is immersed in the oil CL. According to the above configuration, the oil CL is easily lifted up by the tooth surface of the fourth gear 221 through the rotation of the fourth gear 221.

[0067] In the Z-axis direction, the differential axis J3 is arranged between the rotation axis J1 and the intermediate axis J2. Compared with the structure in which the differential axis J3 is arranged closer to the +Z direction side than the rotation axis J1 or closer to the -Z direction side than the intermediate axis J2, by arranging the differential axis J3 closer to the -Z direction side than the rotation axis J1 and closer to the +Z direction side than the intermediate axis J2, the size of the drive device 100 in the Z-axis direction can be further reduced. In particular, the drive shaft Ds that transmits torque by the fourth gear 221 that can rotate around the differential axis J3 can be prevented from obstructing the configuration of the inverter housing 314 in the Z-axis direction. Therefore, the inverter housing 314 can be arranged closer to the -Z direction side, and the size of the drive device 100 in the Z-axis direction can be further reduced. Therefore, the drive device 100 can be made more compact.

[0068] The side gear on the +Y direction side of the differential device 22 is mounted with a drive shaft Ds on the +Y direction side. The side gear on the -Y direction side of the differential device 22 is mounted with a drive shaft Ds on the -Y direction side. The drive shafts Ds are rotatably supported by different bearings (not shown). The bearings are held by the differential device housing 222. The fourth gear 221 is supported by the bearings via the differential device housing 222, the pinion gear, and the side gears.

[0069] <1-3. Housing 3>

[0070] Next, refer to Figure 1 to Figure 2 and Figures 4 to 5 , the structure of the housing 3 is described. Figure 4 It is a perspective view of the housing 3. Figure 5 It is an exploded perspective view of the housing 3.

[0071] The housing 3 includes a housing body 31, a first cover 32, a second cover 33, and a third cover 34. The housing body 31 includes a motor housing 311, a gear housing 312, and an inverter housing 314, which will be described later. The first cover 32 is located on the +Y direction side of the housing body 31. The second cover 33 is located on the -Y direction side of the housing body 31. The third cover 34 is located on the +Z direction side of the housing body 31.

[0072] <1-3-1. Housing body 31>

[0073] The housing body 31 has a motor housing 311, a gear housing 312, a partition wall 313 and an inverter housing 314. In other words, the housing 3 has a motor housing 311 and a gear housing 312. The motor housing 311 is in the shape of a tube extending in the Y-axis direction and accommodates the motor part 1. The gear housing 312 is in the shape of a tube extending in the Y-axis direction and accommodates the gear part 2. The gear housing 312 is arranged on the +Y direction side than the motor housing 311. In addition, the housing 3 has a partition wall 313 and an inverter housing 314. The partition wall 313 divides the motor housing 311 and the gear housing 312. The inverter housing 314 accommodates the inverter unit 6 electrically connected to the stator 12.

[0074] In the present embodiment, the motor housing 311, the gear housing 312 and the partition wall 313 are integrated. In addition, the inverter housing 314 is also integrated with the above-mentioned components. By setting the above-mentioned components as different parts of the same component, the number of components of the housing 3 can be reduced. Therefore, the productivity of the drive device 100 can be improved. However, not limited to the above examples, a part of the motor housing 311, the partition wall 313, the gear housing 312 and the inverter housing 314 may also be a component different from another part.

[0075] <1-3-1-1. Partition wall 313>

[0076] The partition wall 313 covers the end of the motor housing 311 on the +Y direction side, and covers the end of the gear housing 312 on the -Y direction side. The partition wall 313 includes a first partition wall 4 and a second partition wall 5. The first partition wall 4 extends in a direction intersecting the Y-axis direction, and covers the end of the motor housing 311 on the +Y direction side. The second partition wall 5 extends in a direction intersecting the Y-axis direction, and is arranged to be closer to the +X direction side than the first partition wall 4, and covers the end of the gear housing 312 on the -Y direction side together with the first partition wall 4. The second partition wall 5 is arranged to be closer to the +Y direction side than the first partition wall 4.

[0077] By configuring the second partition wall 5 to be closer to the +Y direction side than the first partition wall 4, it is easy to ensure a space for configuring the inverter housing 314 at a location closer to the -Y direction side than the second partition wall 5. Therefore, the inverter housing 314 can be configured closer to the differential axis J3 in the X-axis direction. Therefore, the size of the drive device 100 in the X-axis direction can be further reduced, and the drive device 100 can be configured more compactly.

[0078] In addition, in the present embodiment, as described above, the second gear 212 having a pitch circle radius greater than the third gear 213 is arranged closer to the -Y direction side than the third gear 213. Therefore, the fourth gear 221 meshing with the third gear 213 can be arranged closer to the +Y direction side. Therefore, the second partition wall 5 described later can be arranged closer to the +Y direction side. Therefore, the inverter housing 314 can be arranged closer to the differential axis J3 in the Z direction. Therefore, the size of the drive device 100 in the X-axis direction can be further reduced, so that the drive device 100 can be arranged more compactly.

[0079] Preferably, at least a portion of the second partition wall 5 is arranged on the +Y direction side relative to the second gear 212. In this way, a larger space can be ensured for arranging the inverter housing 314 on the -Y direction side relative to the second partition wall 5. However, the above example does not exclude a structure in which the second partition wall 5 is not arranged on the +Y direction side relative to the second gear 212.

[0080] The first partition wall 4 has an insertion hole 41 , a first motor bearing holding portion 42 , a first gear bearing holding portion 43 , a first intermediate bearing holding portion 44 , and a partition wall opening 45 .

[0081] The insertion hole 41 penetrates the first partition wall 4 along the Y-axis direction. The center of the insertion hole 41 coincides with the rotation axis J1. A first motor bearing retaining portion 42 is arranged on the -Y direction side of the insertion hole 41. A first gear bearing retaining portion 43 is arranged on the +Y direction side of the insertion hole 41. The first motor bearing retaining portion 42 and the first gear bearing retaining portion 43 are connected via the insertion hole 41.

[0082] The first motor bearing retaining portion 42 extends in the -Y direction from the outer edge portion of the -Y direction side of the insertion hole 41 observed along the Y-axis direction. The central axis of the first motor bearing retaining portion 42 coincides with the rotation axis J1. The first motor bearing retaining portion 42 retains the first motor bearing 421, and supports the end portion of the motor shaft 111 on the +Y direction side via the first motor bearing 421 so as to be rotatable. In the present embodiment, the first motor bearing 421 is a ball bearing. The outer ring of the first motor bearing 421 is fixed to the first motor bearing retaining portion 42. The inner ring of the first motor bearing 421 is fixed to the radial outer side surface of the end portion on the +Y direction side of the motor shaft 111.

[0083] The first gear bearing retaining portion 43 extends toward the +Y direction from the outer edge portion of the +Y direction side of the insertion hole 41 observed along the Y-axis direction. The central axis of the first gear bearing retaining portion 43 coincides with the rotation axis J1. The first gear bearing retaining portion 43 retains the first gear bearing 431, and supports the end portion of the -Y direction side of the first shaft 214 to be rotatable via the first gear bearing 431. In the present embodiment, the first gear bearing 431 is a ball bearing. The outer ring of the first gear bearing 431 is fixed to the first gear bearing retaining portion 43. The inner ring of the first gear bearing 431 is fixed to the radial outer side surface of the end portion of the -Y direction side of the first shaft 214.

[0084] The first intermediate bearing retaining portion 44 is arranged on the +Y direction side of the first partition wall 4. The central axis of the first intermediate bearing retaining portion 44 coincides with the intermediate axis J2. The first intermediate bearing retaining portion 44 is arranged to be closer to the -Z direction side than the rotation axis J1 and the differential axis J3. The first intermediate bearing retaining portion 44 retains the first intermediate bearing 441, and supports the end portion of the second shaft 215 on the -Y direction side via the first intermediate bearing 441 so as to be rotatable. In the present embodiment, the first intermediate bearing 441 is a ball bearing. The outer ring of the first intermediate bearing 441 is fixed to the first intermediate bearing retaining portion 44. Moreover, the inner ring of the first intermediate bearing 441 is fixed to the radial outer side surface of the end portion of the second shaft 215 on the -Y direction side.

[0085] The partition wall opening 45 is arranged at the vertical lower part (i.e., the -Z direction side) of the first partition wall 4. The partition wall opening 45 penetrates the first partition wall 4 in the Y-axis direction, connects the motor housing portion 301 and the gear housing portion 302, and particularly connects their vertical lower parts to each other. The partition wall opening 45 allows the oil CL accumulated in the lower part of the motor housing portion 301 to move to the gear housing portion 302. The oil CL moved to the gear housing portion 302 can flow into the oil reservoir P.

[0086] Next, the second partition wall 5 has a first drive shaft through hole 51. The first drive shaft through hole 51 penetrates the second partition wall 5 in the Y-axis direction. The drive shaft Ds installed on the -Y direction side of the differential device 22 passes through the first drive shaft through hole 51 in a rotatable state. An oil seal (not shown) is provided between the drive shaft Ds and the first drive shaft through hole 51 to suppress leakage of the oil CL.

[0087] The second partition wall 5 also has a differential device accommodating portion 52. The differential device accommodating portion 52 is recessed in the -Y direction to accommodate a portion of the differential device 22. By accommodating a portion of the differential device 22 in the differential device accommodating portion 52, the interval between the fourth gear 221 and the second partition wall 5 in the Y-axis direction can be further reduced. Therefore, the size of the drive device 100 in the Y-axis direction can be further reduced.

[0088] At least a portion of the differential device housing portion 52 is located on the -Z direction side of the inverter housing 314. In this way, the differential device housing portion 52 can be arranged without interfering with the inverter housing 314 in the Z-axis direction.

[0089] <1-3-1-2. Inverter housing 314>

[0090] The inverter housing 314 has a bottom plate 3141 and a peripheral wall 3142. The bottom plate 3141 extends from the outer side surface of the motor housing 311 in the +X direction. The peripheral wall 3142 protrudes from the outer edge of the bottom plate 3141 in the Z-axis direction in the +Z direction, and surrounds the bottom plate 3141 when viewed from the Z-axis direction. The inverter housing 314 and the third cover 34 together constitute the inverter housing portion 303.

[0091] The bottom plate 3141 is disposed on the +X direction side relative to the second shaft 215. In this way, for example, the second shaft 215 is unlikely to interfere with the arrangement of the inverter housing 314 in the X-axis direction.

[0092] The portion of the peripheral wall 3142 on the +Y direction side includes the +Z direction end of the second partition wall 5. In this way, a space for arranging at least a part of the inverter housing 314 on the -Z direction side of the second partition wall 5 can be ensured.

[0093] <1-3-2. First Cover 32>

[0094] Next, the first cover 32 is mounted on the end of the gear housing 312 on the +Y direction side, and the end of the gear housing 312 on the +Y direction side is closed and blocked. The shape of the first cover 32 is a concave shape that opens in the -Y direction. The first cover 32, the gear housing 312, and the partition wall 313 together constitute the gear accommodating portion 302. The first cover 32 has a second gear bearing retaining portion 321, a second intermediate bearing retaining portion 322, a second drive shaft through hole 323, a receiving plate portion 324, a gear side oil passage 325, and a gear side limiting member 326.

[0095] The second gear bearing retaining portion 321 is arranged on the -Y direction side of the first cover portion 32. The central axis of the second gear bearing retaining portion 321 is consistent with the rotation axis J1. The second gear bearing retaining portion 321 retains the second gear bearing 3211, and supports the end of the +Y direction side of the first shaft 214 to be rotatable via the second gear bearing 3211. In the present embodiment, the second gear bearing 3211 is a ball bearing. The outer ring of the second gear bearing 3211 is fixed to the second gear bearing retaining portion 321. The inner ring of the second gear bearing 3211 is fixed to the radial outer side surface of the end of the +Y direction side of the first shaft 214.

[0096] The second intermediate bearing retaining portion 322 is arranged on the -Y direction side of the first cover portion 32. The central axis of the second intermediate bearing retaining portion 322 coincides with the intermediate axis J2. The second intermediate bearing retaining portion 322 is arranged on the -Z direction side relative to the rotation axis J1 and the differential axis J3. The second intermediate bearing retaining portion 322 retains the second intermediate bearing 3221, and supports the end portion of the second shaft 215 on the +Y direction side via the second intermediate bearing 3221 so as to be rotatable. In the present embodiment, the second intermediate bearing 3221 is a ball bearing. The outer ring of the second intermediate bearing 3221 is fixed to the second intermediate bearing retaining portion 322. Moreover, the inner ring of the second intermediate bearing 3221 is fixed to the radial outer side surface of the end portion of the second shaft 215 on the +Y direction side.

[0097] The second drive shaft through hole 323 passes through the first cover portion 32 in the axial direction. When viewed from the Y-axis direction, the second drive shaft through hole 323 overlaps with the first drive shaft through hole 51. The drive shaft Ds installed on the +Y direction side of the differential device 22 passes through the second drive shaft through hole 323 in a rotatable state. An oil seal (not shown) is provided between the drive shaft Ds and the second drive shaft through hole 323 to suppress leakage of the oil CL.

[0098] The receiving tray portion 324 is arranged at a radially outer side based on the differential axis J3 as a reference compared to the fourth gear 221, and is open in the +Z direction (i.e., vertically upward). The oil CL lifted by the fourth gear 221 is stored in the receiving tray portion 324. The receiving tray portion 324 extends from the partition wall 313 in the +Y direction. The end of the +Y direction side of the receiving tray portion 324 is connected to the inner surface of the first cover portion 32 facing the -Y direction. The receiving tray portion 324 has a supply hole 3241. A portion of the oil CL accumulated in the receiving tray portion 324 is supplied to the first gear bearing 431, the second gear bearing 3211, the first intermediate bearing 441 and the second intermediate bearing 3221 to lubricate and cool them, and is supplied to the first gear 211, the second gear 212 and the third gear 213 to lubricate their tooth surfaces. The oil CL used to lubricate and cool the gears and bearings of the gear portion 2 as described above returns to the oil storage portion P.

[0099] The gear side oil circuit 325 is formed inside the first cover portion 32. The gear side oil circuit 325 is a flow path for the oil CL that connects the end of the receiving tray portion 324 on the +Y direction side and the second gear bearing retaining portion 321. Moreover, one end of the gear side oil circuit 325 is connected to the end of the receiving tray portion 324 on the +Y direction side to be connected to the receiving tray portion 324. The other end of the gear side oil circuit 325 is connected to the second gear bearing retaining portion 321. The oil CL stored in the receiving tray portion 324 is supplied to the gear side oil circuit 325. Figure 2 As shown, a portion of the oil CL supplied to the gear side oil passage 325 is supplied to the second gear bearing 3211. In addition, another portion of the oil CL supplied to the gear side oil passage 325 flows from the end portion on the +Y direction side of the first shaft 214 into the hollow portion 2142 and flows in the -Y direction, and flows into the hollow portion 1112 of the motor shaft 111.

[0100] The gear-side limiting member 326 limits the amount of oil CL supplied from the gear-side oil passage 325 to the second gear bearing 3211. By the above-mentioned limitation, it is possible to ensure that the oil CL is supplied from the gear-side oil passage 325 through the hollow portion 2142 of the first shaft 214 and to the hollow portion 1112 of the motor shaft 111. The gear-side limiting member 326 includes: an annular portion (symbol omitted) opposite to the second gear bearing 3211 in the Y-axis direction; and a cylindrical portion (symbol omitted) extending from the radial inner end of the annular portion in the -Y direction and inserted into the interior of the first shaft 214. The annular portion has a through hole (symbol omitted) penetrating the annular portion in the Y-axis direction. The oil CL is supplied to the second gear bearing 3211 through the through hole, and is supplied to the interior of the first shaft 214 through the cylindrical portion.

[0101] <1-3-3. Second Cover 33>

[0102] The second cover 33 is attached to the end portion on the −Y direction side of the motor housing 311 to close and seal the end portion on the −Y direction side of the motor housing 311. The second cover 33, the motor housing 311, and the partition wall 313 together constitute the motor housing portion 301.

[0103] The second cover portion 33 has a second motor bearing retaining portion 331. The second motor bearing retaining portion 331 is arranged on the +Y direction side of the second cover portion 33. The central axis of the second motor bearing retaining portion 331 coincides with the rotation axis J1. The second motor bearing retaining portion 331 retains the second motor bearing 3311, and supports the end portion of the motor shaft 111 on the -Y direction side via the second motor bearing 3311 so as to be rotatable. In the present embodiment, the second motor bearing 3311 is a ball bearing. The outer ring of the second motor bearing 3311 is fixed to the second motor bearing retaining portion 331. Moreover, the inner ring of the second motor bearing 3311 is fixed to the radial outer side surface of the end portion of the motor shaft 111 on the -Y direction side.

[0104] <1-3-4. Third Cover 34>

[0105] Furthermore, the housing 3 further includes a third cover 34. The third cover 34 is disposed on the +Z direction side of the motor housing 311. The third cover 34 is attached to the upper side of the housing body 31. The third cover 34 and the inverter housing 314 constitute the inverter housing portion 303.

[0106] <1-4. Pump 7 and oil cooler 8>

[0107] Next, refer to Figure 1 and Figure 2 , the pump 7 and the oil cooler 8 are described.

[0108] The pump 7 is an electrically driven electric pump, and is connected to the inverter unit 6 via a harness cable (not shown). That is, the pump 7 is driven by the inverter unit 6. The pump 7 can be a trochoid pump, a centrifugal pump, or the like. The pump 7 sucks up the oil CL from the oil reservoir P, and supplies it to the oil supply unit 72 described later via the oil cooler 8.

[0109] The oil cooler 8 performs heat exchange between the oil CL sent from the pump 7 and the refrigerant RE supplied by a system different from the motor-side oil passage 71 described later. Thus, the oil cooler 8 cools the oil CL sent from the pump 7. The pump 7 and the oil cooler 8 are fixed to the casing body 31 by bolts (not shown).

[0110] The oil CL circulates in the motor-side oil circuit 71 provided in the housing 3. The motor-side oil circuit 71 is an oil circuit for supplying the oil CL from the oil reservoir P to the motor unit 1. The motor-side oil circuit 71 circulates the oil CL to cool the motor unit 1. The oil CL is used as a lubricating liquid for lubricating the gear unit 2. In addition, the oil CL is used as a refrigerant for cooling the motor unit 1 and the gear unit 2. The oil CL is accumulated in the oil reservoir P at the lower part of the gear housing 312. In order for the oil CL to function as a lubricating liquid and a refrigerant, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) with a lower viscosity.

[0111] The motor-side oil passage 71 is a flow passage for supplying oil CL from the oil reservoir P to the oil supply portion 72. The oil supply portion 72 supplies oil CL to the stator 12. The drive device 100 includes an oil supply portion 72. In the present embodiment, the oil supply portion 72 is in the shape of a cylinder extending in the axial direction, is accommodated in the motor accommodation portion 301, and is arranged radially outward of the stator 12. The oil supply portion 72 has a supply hole 721. The supply hole 721 penetrates the oil supply portion 72 in the radial direction. A portion of the oil CL flowing inside the oil supply portion 72 is supplied to the Y-axis direction end and the radial outer side of the stator 12 through the supply hole 721. Another portion of the above-mentioned oil CL is supplied to the first motor bearing 421 and the second motor bearing 3311 through the supply hole 721 to lubricate and cool them. The oil CL used to lubricate and cool the stator 12 , the first motor bearing 421 , and the second motor bearing 3311 is accumulated in the lower portion of the motor housing portion 301 , passes through the partition wall opening 45 , and returns to the oil reservoir P in the lower portion of the gear housing portion 302 .

[0112] <2. Others>

[0113] The above is a description of the embodiments of the present invention. In addition, the scope of the present invention is not limited by 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 without causing contradictions.

[0114] Industrial Applicability

[0115] The present invention is useful for a driving motor of a vehicle such as a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV).

Claims

1. A driving device, characterized in that: include: a motor unit, the motor unit including a rotor and a stator, the rotor including a motor shaft, the motor shaft being rotatable around a first rotation axis extending in the axial direction, the stator being arranged radially outward of the rotor; a gear portion located at one axial end portion of the motor portion; and a housing, wherein the housing accommodates the motor unit and the gear unit, The gear portion has: a first shaft connected to the motor shaft; a first gear, the first gear being located on a radially outer side of the first shaft; a second shaft, the second shaft extending along a second rotating axis, the second rotating axis extending in an axial direction; a second gear and a third gear, the second gear and the third gear being located on a radially outer side of the second shaft extending in the axial direction and being rotatable around the second rotating shaft; and a fourth gear, the fourth gear being rotatable about a third rotating shaft extending in the axial direction, The second gear is arranged on the other side of the axial direction than the third gear and meshes with the first gear. The third gear meshes with the fourth gear, The pitch circle diameter of the second gear is larger than the pitch circle diameter of the third gear. The third rotating shaft is arranged on one side of the first rotating shaft in a first direction perpendicular to the axial direction, The housing has: a motor housing, the motor housing being in a cylindrical shape extending in the axial direction and accommodating the motor part; a gear housing, the gear housing being in a cylindrical shape extending in the axial direction and accommodating the gear portion; a partition wall, the partition wall dividing the motor housing and the gear housing; as well as an inverter housing, wherein the inverter housing accommodates an inverter unit electrically connected to the stator, The fourth gear is arranged to be closer to one side of the inverter housing in the axial direction. The first rotating shaft is arranged to be closer to the other side of the first direction than the inverter housing. The third rotating shaft is arranged on a side of the inverter housing that is closer to a second direction perpendicular to the axial direction and the first direction. The partition wall has: a first partition wall extending in a direction intersecting the axial direction and covering an axial end portion of the motor housing; as well as a second partition wall extending in a direction intersecting the axial direction and arranged to be closer to one side of the first direction than the first partition wall, and covering the other axial end of the gear housing together with the first partition wall, The second partition wall is arranged on one side of the first partition wall in the axial direction. The inverter housing has: a bottom plate extending from an outer side surface of the motor housing toward one side of the first direction; as well as a peripheral wall, the peripheral wall protruding from an outer edge portion of the bottom plate viewed along the second direction toward the other side of the second direction, surrounding the bottom plate when viewed along the second direction, The portion of the peripheral wall on one axial side includes the other end portion of the second partition wall in the second direction.

2. The driving device according to claim 1, characterized in that: The housing has: A housing body, the housing body comprising the motor housing, the gear housing and the inverter housing; a first cover portion, the first cover portion being located at one axial side of the housing body; a second cover portion, the second cover portion being located at the other axial side of the housing body; as well as a third cover portion, the third cover portion being located on the other side of the housing body in the second direction, The motor housing, the gear housing and the inverter housing are respectively integrated.

3. The driving device according to claim 1 or 2, characterized in that: The second rotation axis is arranged on one side in the second direction than the first rotation axis.

4. The driving device according to claim 1 or 2, characterized in that: In the second direction, the third rotating shaft is disposed between the first rotating shaft and the second rotating shaft.

5. The driving device according to claim 1 or 2, characterized in that: The bottom plate is arranged on the other side of the second direction relative to the second axis.

6. The driving device according to claim 1 or 2, characterized in that: At least a portion of the second partition wall is disposed on one side in the axial direction relative to the second gear.

7. The driving device according to claim 1 or 2, characterized in that: The pitch circle diameter of the fourth gear is greater than the pitch circle diameter of the second gear.

8. The driving device according to claim 1 or 2, characterized in that: The gear unit has a drive shaft and a differential device. The drive shaft extends axially from the differential device, The fourth gear is the ring gear of the differential device, The differential device transmits the torque of the fourth gear to the drive shaft. The drive shaft is located on one side of the inverter housing in the second direction.

9. The driving device according to claim 8, characterized in that: The fourth gear has a plurality of teeth, and the plurality of teeth are disposed at a radially outer end portion of the fourth gear and arranged in a circumferential direction. In the axial direction, a distance between the other axial end of the tooth of the fourth gear and the other axial end of the differential device is greater than a distance between one axial end of the tooth and one axial end of the differential device.

10. The driving device according to claim 8, characterized in that: The second partition wall has a differential device accommodating portion that is recessed toward the other side in the axial direction and accommodates a portion of the differential device.

11. The driving device according to claim 10, characterized in that: At least a portion of the differential device housing portion is located on one side of the inverter housing in the second direction.

12. The driving device according to claim 8, characterized in that: When viewed along the first direction, at least a portion of the second gear overlaps the differential device.

13. A driving device, characterized in that: include: a motor unit, the motor unit including a rotor and a stator, the rotor including a motor shaft, the motor shaft being rotatable around a first rotation axis extending in the axial direction, the stator being arranged radially outward of the rotor; a gear portion located at one axial end portion of the motor portion; and a housing, wherein the housing accommodates the motor unit and the gear unit, The gear portion has: a first shaft connected to the motor shaft; a first gear, the first gear being located on a radially outer side of the first shaft; a second shaft, the second shaft extending along a second rotating axis, the second rotating axis extending in an axial direction; a second gear and a third gear, the second gear and the third gear being located on a radially outer side of the second shaft extending in the axial direction and being rotatable around the second rotating shaft; and a fourth gear, the fourth gear being rotatable about a third rotating shaft extending in the axial direction, The second gear is arranged on the other side of the axial direction than the third gear and meshes with the first gear. The third gear meshes with the fourth gear, The pitch circle diameter of the second gear is larger than the pitch circle diameter of the third gear. The third rotating shaft is arranged on one side of the first rotating shaft in a first direction perpendicular to the axial direction, The housing has: a motor housing, the motor housing being in a cylindrical shape extending in the axial direction and accommodating the motor part; a gear housing, the gear housing being in a cylindrical shape extending in the axial direction and accommodating the gear portion; a partition wall, the partition wall dividing the motor housing and the gear housing; as well as an inverter housing, wherein the inverter housing accommodates an inverter unit electrically connected to the stator, The fourth gear is arranged to be closer to one side of the inverter housing in the axial direction. The first rotating shaft is arranged to be closer to the other side of the first direction than the inverter housing. The third rotating shaft is arranged on a side of the inverter housing that is closer to a second direction perpendicular to the axial direction and the first direction. The partition wall has: a first partition wall extending in a direction intersecting the axial direction and covering an axial end portion of the motor housing; as well as a second partition wall extending in a direction intersecting the axial direction and arranged to be closer to one side of the first direction than the first partition wall, and covering the other axial end of the gear housing together with the first partition wall, The second partition wall is arranged on one side of the first partition wall in the axial direction. The inverter housing has: a bottom plate extending from an outer side surface of the motor housing toward one side of the first direction; as well as a peripheral wall, the peripheral wall protruding from an outer edge portion of the bottom plate viewed along the second direction toward the other side of the second direction, surrounding the bottom plate when viewed along the second direction, The bottom plate is arranged on the other side of the second direction relative to the second axis.

14. The driving device according to claim 13, characterized in that: The housing has: A housing body, the housing body comprising the motor housing, the gear housing and the inverter housing; a first cover portion, the first cover portion being located at one axial side of the housing body; a second cover portion, the second cover portion being located at the other axial side of the housing body; as well as a third cover portion, the third cover portion being located on the other side of the housing body in the second direction, The motor housing, the gear housing and the inverter housing are respectively integrated.

15. The driving device according to claim 13 or 14, characterized in that: The second rotation axis is arranged on one side in the second direction than the first rotation axis.

16. The driving device according to claim 13 or 14, characterized in that: In the second direction, the third rotating shaft is disposed between the first rotating shaft and the second rotating shaft.

17. The driving device according to claim 13 or 14, characterized in that: At least a portion of the second partition wall is disposed on one side in the axial direction relative to the second gear.

18. The driving device according to claim 13 or 14, characterized in that: The pitch circle diameter of the fourth gear is greater than the pitch circle diameter of the second gear.

19. The driving device according to claim 13 or 14, characterized in that: The gear unit has a drive shaft and a differential device. The drive shaft extends axially from the differential device, The fourth gear is the ring gear of the differential device, The differential device transmits the torque of the fourth gear to the drive shaft. The drive shaft is located on one side of the inverter housing in the second direction.

20. The driving device according to claim 19, characterized in that The fourth gear has a plurality of teeth, and the plurality of teeth are disposed at a radially outer end portion of the fourth gear and arranged in a circumferential direction. In the axial direction, a distance between the other axial end of the tooth of the fourth gear and the other axial end of the differential device is greater than a distance between one axial end of the tooth and one axial end of the differential device.

21. The driving device according to claim 19, characterized in that The second partition wall has a differential device accommodating portion that is recessed toward the other side in the axial direction and accommodates a portion of the differential device.

22. The driving device according to claim 21, characterized in that At least a portion of the differential device housing portion is located on one side of the inverter housing in the second direction.

23. The driving device according to claim 19, characterized in that When viewed along the first direction, at least a portion of the second gear overlaps the differential device.

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