Drive device

Abstract

The purpose of the present invention is to reduce the size of a drive device. In the drive device, a first flow path of a fluid flow path through which a fluid flows connects a gear housing portion and a first inlet of a pump. The second flow path connects the first outlet of the pump to one end of the third flow path via the cooler. The third flow path is disposed inside the partition wall of the housing and extends in a direction intersecting the rotational axis of the first shaft. The fourth flow path connects the other end of the third flow path and one end of the fifth flow path. The fifth flow path is disposed inside the gear-side cover portion of the housing. The other end of the fifth flow path is connected to one axial end of the second shaft. One end of the sixth flow path is connected to the other end of the third flow path. The other end portion of the sixth flow path is disposed in the housing cylinder portion of the housing.

Description

This invention is a divisional application of the invention patent application with application number 202210302280.6, application date March 25, 2022, and invention name “Driving Device”. Technical Field

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

[0002] Conventionally, drive devices are known that have a flow path for oil drawn from a pump. For example, the flow path branches into a lubrication circuit that supplies oil drawn from a mechanical oil pump to the power transmission mechanism, and a cooling circuit that supplies oil drawn from an electric oil pump to the electric motor. (See, for example, Japanese Patent Application Laid-Open No. 2019-129608.) [Prior art literature] [Patent Document]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-129608 Summary of the Invention

[0004] However, the above-mentioned drive device is equipped with both a mechanical oil pump and an electric oil pump, which may increase the size of the drive device.

[0005] An object of the present invention is to further reduce the size of a driving device.

[0006] An exemplary drive device according to the present invention includes a motor unit, a gear unit, a housing, a pump, a cooler, and a fluid flow path. The motor unit includes a rotor and a stator. The rotor includes a first shaft. The first shaft is rotatable about an axially extending rotation axis. The stator is positioned radially outward of the rotor. The gear unit is mounted on one axial side of the first shaft. The housing accommodates the motor unit and the gear unit. The pump pumps fluid within the housing. The cooler cools the fluid. The fluid flows in the fluid flow path. The first shaft is cylindrical and extends axially, having a shaft through-hole. The shaft through-hole extends radially. The gear unit includes a second shaft. The second shaft is cylindrical and extends axially, connected to one axial end of the first shaft. The housing includes a housing cylindrical portion, a partition wall, and a gear side cover portion. The housing cylindrical portion extends axially and accommodates the motor unit. The partition wall closes one axial end of the housing cylindrical portion. The gear side cover portion and the partition wall together constitute a gear storage portion. The gear storage portion is arranged at one axial end of the partition wall and accommodates the gear unit. The fluid flow path includes a first flow path, a second flow path, a third flow path, a fourth flow path, a fifth flow path and a sixth flow path. The first flow path connects the gear housing and the first inlet of the pump. The second flow path connects the first outlet of the pump to one end of the third flow path via the cooler. The third flow path is arranged inside the partition wall and extends in a direction intersecting the axis of rotation. The fourth flow path connects the other end of the third flow path and one end of the fifth flow path. The fifth flow path is arranged inside the gear side cover. The other end of the fifth flow path is connected to one axial end of the second shaft. One end of the sixth flow path is connected to the other end of the third flow path. The other end of the sixth flow path is arranged inside the housing cylinder.

[0007] According to the exemplary driving device of the present invention, the driving device can be further miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram showing a configuration example of the driving device viewed from the X-axis direction. Figure 2 This is a schematic diagram of the drive device viewed from the Z-axis direction. Figure 3 This is a schematic diagram of the bottom surface of the drive device. Figure 4 This is a cross-sectional view of the drive device viewed from the Y-axis direction. Figure 5 This is a perspective cross-sectional view of the drive device viewed from the Y-axis direction. Figure 6 This is a schematic diagram showing an example of a vehicle equipped with a drive device. Figure 7 It is a conceptual diagram showing an example of arrangement of an intermediate shaft. Figure 8 It is an enlarged view of the second flow path. Figure 9 This is a schematic diagram showing a modified example of the drive device as viewed from the X-axis direction. Figure 10 It is a conceptual diagram showing the arrangement of the tank. Figure 11 It is an enlarged cross-sectional view showing a structural example of a tank. Figure 12A It is an enlarged cross-sectional view showing a first modified example of the tank. Figure 12B It is an enlarged cross-sectional view showing a second modified example of the tank. Figure 13 It is an enlarged cross-sectional view showing a modified example of the third outflow port. (Explanation of Symbols) 100, 100a drive device; 200 battery; 300 vehicle; 1 motor shaft; 2 motor unit; 21 rotor; 210 first shaft; 2101 first shaft cylinder; 2102 first hollow portion; 2103 shaft through-hole; 211 rotor core; 2111 rotor through-hole; 212 magnet; 22 stator; 221 stator core; 222 coil unit; 2221 coil end portion; 223 protrusion; 3 gear unit; 31 reduction gear; 310 second shaft; 3101 second shaft cylinder; 3102 second hollow portion; 311 main drive gear; 312 intermediate driven gear; 313 final drive gear; 314 intermediate shaft; 32 differential; 321 ring gear; 4 housing; 4 01 Motor housing portion; 402 Gear housing portion; 41 Housing cylinder portion; 411 Recess; 42 Partition wall; 4201 Partition wall through hole; 4202 First output shaft through hole; 4203 Opening; 421 First motor bearing retaining portion; 4211 First motor bearing; 422 First gear bearing retaining portion; 4221 First gear bearing; 423 First intermediate bearing retaining portion; 4231 First intermediate bearing; 424 First output bearing retaining portion; 4241 First output bearing; 43 Gear side cover portion; 4301 Second output shaft through hole; 431 Second gear bearing retaining portion; 4311 Second gear bearing; 432 Second intermediate bearing retaining portion; 4321 Second intermediate bearing intermediate bearing; 433 second output bearing retaining portion; 4331 second output bearing; 434 tray portion; 4341 hole portion; 44 motor side cover portion; 441 second motor bearing retaining portion; 4411 second motor bearing; 5 pump; 50 fixing portion; 51 first inlet; 52 first outlet; 6 cooler; 61 second inlet; 62 second outlet; 7, 7a fluid flow path; 71 first flow path; 72 second flow path; 721 first fluid path; 722 second fluid path; 7221 sealing plug; 723 third fluid path; 724 fourth fluid path; 725 fifth fluid path; 73 third flow path; 74 fourth flow path; 741 third inlet; 742 third Outlet; 75 fifth flow path; 751 providing a restriction component; 76 sixth flow path; 761 internal flow path; 762 fluid providing component; 763 providing hole; 77 seventh flow path; 771 providing a restriction component; 8 tank; 81 first tank component; 82 second tank component; 83 sealing component; 84 bottom surface; 85 inclined surface; F fluid; P fluid storage part; Ds output shaft; J1 rotation axis; J2 intermediate axis; J3 differential axis; Cp1, Cp2 connecting part; Lv1 first imaginary line; Lv2 second imaginary line; L1 first line segment; L2 second line segment; L3 third line segment; L4 fourth line segment; L5 fifth line segment; L6 sixth line segment; Cv imaginary circle; Pv imaginary plane. DETAILED DESCRIPTION

[0009] Exemplary embodiments will be described below with reference to the accompanying drawings.

[0010] In the following description, the direction of gravity is specified for description based on the positional relationship when the drive device 100 is mounted on the vehicle 300 located on a horizontal road. In addition, in the accompanying drawings, the XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction shows the vertical direction (i.e., the up and down direction). The +Z direction is upward (toward the vertical upward direction opposite to the direction of gravity), and the -Z direction is downward (toward the vertical downward direction identical to the direction of gravity). In addition, the "Z-axis direction" in the following description is an example of the "second direction" of the present invention. 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.

[0011] The X-axis direction is a direction perpendicular to the Z-axis direction and represents the front-to-back direction of the vehicle 300 equipped with the drive device 100. The +X direction is the front of the vehicle 300, and the -X direction is the rear of the vehicle 300. However, the +X direction may also be the rear of the vehicle 300, and the -X direction may also be the front of the vehicle 300. In the following description, the "X-axis direction" is an example of the "first direction" of the present invention. The "-X direction" is an example of "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.

[0012] 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 300. The +Y direction is the left direction of the vehicle 300, and the -Y direction is the right direction of the vehicle 300. However, in the case where the +X direction is the rear of the vehicle 300, the +Y direction may be the right direction of the vehicle 300, and the -Y direction may be the left direction of the vehicle 300. That is, regardless of the X-axis direction, only the +Y direction becomes one side of the left-right direction of the vehicle 300, and the -Y direction becomes the other side of the left-right direction of the vehicle 300. In addition, depending on the method of mounting the drive device 100 on the vehicle 300, there is also a case where the X-axis direction is the width direction (left-right direction) of the vehicle 300 and the Y-axis direction is the front-back direction of the vehicle 300. In the following embodiment, the Y-axis direction is parallel to, for example, the rotation axis J1 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. Furthermore, the “+Y direction” is an example of “one axial direction” in the present invention, and the “−Y direction” is an example of “the other axial direction” in the present invention.

[0013] In the following description, unless otherwise specified, the direction parallel to a specified axis such as the rotation axis J1 of the motor unit 2 (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". 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".

[0014] The direction of rotation about a predetermined axis is referred to as the “circumferential direction Dr.” When viewed from the −Y direction to the +Y direction, the counterclockwise direction is referred to as the “one circumferential direction Dr1 ,” and the clockwise direction is referred to as the “other circumferential direction Dr2 .”

[0015] In this specification, the term "annular" includes shapes that are continuously connected without a break throughout the entire area in the circumferential direction Dr centered on a predetermined axis, as well as shapes that have one or more breaks in a portion of the entire area centered on the predetermined axis. Furthermore, it includes shapes that describe a closed curve centered on the predetermined axis on a curved surface that intersects the predetermined axis.

[0016] Furthermore, in the positional relationship between any one of an orientation, a line, and a plane and any other, "parallel" includes not only a state in which the two do not intersect at all, no matter how far they are extended, but also a state in which they are substantially parallel. Furthermore, "perpendicular" and "orthogonal" include not only a state in which the two intersect at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal. In other words, "parallel," "perpendicular," and "orthogonal" each include 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.

[0017] In addition, these names are merely for explanation and are not intended to limit actual positional relationships, directions, names, etc.

[0018] 1. Implementation Method Figure 1 1 is a schematic diagram showing a configuration example of the drive device 100 as viewed from the X-axis direction. Figure 2 This is a schematic diagram of the driving device 100 viewed from the Z-axis direction. Figure 3 It is a schematic diagram of the bottom surface of the driving device 100 . Figure 4 It is a cross-sectional view of the driving device 100 as viewed from the Y-axis direction. Figure 5 It is a perspective cross-sectional view of the driving device 100 as viewed from the Y-axis direction. Figure 6 1 is a schematic diagram showing an example of a vehicle 300 equipped with the drive device 100. Figure 3The driving device 100 is viewed from the −Z direction toward the +Z direction. Figure 4 and Figure 5 Shown to include Figure 3 The cross-sectional structure of the driving device 100 is shown when a virtual plane cuts the driving device 100 along the dot-dash line BB and perpendicular to the Y-axis direction. Figure 4 This is a diagram of the cross-sectional structure viewed from the -Y direction toward the +Y direction. Figure 5 When viewed from the -Y direction to the +Y direction Figure 4 FIG. 1 is a diagram showing a cross-sectional structure of the driving device 100. Figures 1 to 5 This is just a conceptual diagram, and the configuration and size of each part are not limited to the same as those of the actual driving device 100. Figure 6 A vehicle 300 is conceptually illustrated.

[0019] <1-1. Driving device 100> In this embodiment, if Figure 6 As shown, the drive device 100 is mounted on a vehicle 300 that uses at least a motor as a power source. The vehicle 300 is, for example, a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), etc. The drive device 100 is used as a power source for the vehicle 300. The vehicle 300 includes the drive device 100 and a battery 200. The battery 200 stores electric power for supplying to the drive device 100. In the example of the vehicle 300, the drive device 100 drives the left and right front wheels. Alternatively, the drive device 100 only needs to drive at least one wheel.

[0020] like Figures 1 to 5 As shown, the drive device 100 includes a motor shaft 1 , a motor unit 2 , a gear unit 3 , a housing 4 , a pump 5 , a cooler 6 , and a fluid flow path 7 .

[0021] The motor shaft 1 extends in the Y-axis direction along a rotation axis J1 parallel to the horizontal direction and is rotatable about the rotation axis J1. In this embodiment, the motor shaft 1 is divided in the center of the Y-axis direction to include a first shaft 210 and a second shaft 310, described later. However, this is not limiting; the motor shaft 1 may not be divided in the center of the Y-axis direction, for example, it may include only the first shaft 210. In this case, the end of the first shaft 210 on the +Y direction side is rotatably supported by the second gear bearing retaining portion 431 via a second gear bearing 4311, described later.

[0022] <1-2. Motor Section 2> Next, refer to Figures 1 to 5 The motor unit 2 is described. The motor unit 2 is a driving source of the driving device 100 and is driven by electric power from an inverter unit (not shown). Figure 1As shown, the motor unit 2 includes a rotor 21 and a stator 22. As described above, the drive device 100 includes the motor unit 2. The rotor 21 includes a first shaft 210. The first shaft 210 is rotatable about a rotation axis J1 extending in the Y-axis direction. The stator 22 is positioned radially outward from the rotor 21. In other words, the motor unit 2 is an inner rotor type motor. The rotor 21 rotates when power is supplied to the stator 22 from a power supply unit (not shown) of the drive device 100.

[0023] The first shaft 210 is cylindrical and extends in the Y-axis direction. It includes a first cylindrical portion 2101 and a first hollow portion 2102. The first cylindrical portion 2101 extends in the Y-axis direction along the rotation axis J1. The first hollow portion 2102 is the space enclosed by the first cylindrical portion 2101 and is disposed within the first cylindrical portion 2101.

[0024] In addition, the first shaft 210 also has a shaft through-hole 2103 that penetrates in the radial direction. The shaft through-hole 2103 is arranged on the first shaft cylinder portion 2101 and penetrates the first shaft cylinder portion 2101 in the radial direction. Fluid F flows on the inner side of the first shaft 210. Fluid F is used as a lubricating liquid for lubricating the gear portion 3. In addition, fluid F is also used as a refrigerant for cooling the motor portion 2 and the gear portion 3. In order to have the functions of lubrication and refrigerant, it is preferred that fluid F use an oil equivalent to a low-viscosity automatic transmission lubricant (ATF: Automatic Transmission Fluid). When the motor shaft 1 rotates, the fluid F in the first shaft 210 flows out from the first hollow portion 2102 to the outside of the first shaft 210 through the shaft through-hole 2103 due to centrifugal force. In this embodiment, as Figure 1 As shown, the shaft through hole 2103 is arranged closer to the -Y direction than the end of the rotor 21 on the +Y direction side and closer to the +Y direction than the end of the rotor 21 on the -Y direction side, and is connected to the rotor through hole 2111 described below.

[0025] However, this is not limited to the above example. The shaft through-hole 2103 may be located closer to the +Y direction than the end of the rotor 21 on the +Y direction, or closer to the -Y direction than the end of the rotor 21 on the -Y direction. In other words, at least a portion of the shaft through-hole 2103 may be located at at least one of these locations. Furthermore, the shaft through-hole 2103 may be single or multiple in the circumferential direction Dr or in the Y-axis direction.

[0026] The rotor 21 also includes a rotor core 211 and magnets 212. In this embodiment, the rotor core 211 is a laminated structure composed of multiple plate-shaped electromagnetic steel sheets. The rotor core 211 is a cylindrical body extending in the Y-axis direction and is fixed to the radially outer surface of the first shaft 210. Multiple magnets 212 are fixed to the rotor core 211. The magnetic poles of the multiple magnets 212 are arranged alternately in the circumferential direction Dr.

[0027] The rotor core 211 also has a rotor through-hole 2111. The rotor through-hole 2111 extends through the rotor core 211 in the Y-axis direction and is connected to the shaft through-hole 2103. The rotor through-hole 2111 serves as a flow path for fluid F, which also functions as a refrigerant. When the rotor 21 rotates, the fluid F flowing through the first hollow portion 2102 of the first shaft 210 flows into the rotor through-hole 2111 via the shaft through-hole 2103. Furthermore, the fluid F flowing into the rotor through-hole 2111 flows outward from the ends on both sides of the rotor through-hole 2111 in the Y-axis direction. A portion of the outflowing fluid F splashes onto the stator 22, for example, cooling the coil portion 222 (particularly the coil end portion 2221). Furthermore, a portion of the outflowing fluid F splashes onto the first motor bearing 4211 and the second motor bearing 4411, which rotatably support the first shaft 210, lubricating and cooling them.

[0028] The stator 22 includes a stator core 221 and a coil portion 222. The stator 22 is held by a housing cylindrical portion 41, described later. The stator core 221 includes a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumference of an annular magnetic yoke. The coil portion 222 is formed by winding a conductive wire around the magnetic pole teeth via an insulator (not shown). The coil portion 222 includes a coil end 2221 that protrudes from an axial end surface of the stator core 221.

[0029] The stator 22 also has a protrusion 223 (see, for example, Figure 4 ). The protrusion 223 protrudes radially outward at the radial outer end of the stator 22 and extends in the Y-axis direction. In the present embodiment, the protrusion 223 is a portion for fixing the stator 22 relative to the housing 4. The protrusion 223 is arranged at the radial outer end of the stator core 221. There are multiple protrusions 223 of the stator 22, which are arranged in the circumferential direction. A through hole (symbol omitted) extending in the Y-axis direction is formed on the protrusion 223. A bolt extending in the Y-axis direction is inserted into the through hole. The stator 22 is fixed to the housing 4 by screwing the bolt with the partition wall 42 of the housing 4, for example, which will be described later. In addition, a recess 411 is arranged on the inner side surface of the housing cylinder 41 (for example, refer to Figure 4 The recess 411 is recessed radially outward and extends in the Y-axis direction. At least a portion of the protrusion 223 is accommodated in the recess 411. This more reliably prevents the stator 22 from rotating circumferentially relative to the housing cylindrical portion 41.

[0030] <1-3. Gear Unit 3> Next, refer to Figure 1 and Figure 2 The gear unit 3 will now be described in detail. The gear unit 3 is mounted on the +Y-axis side of the motor shaft 1. As described above, the drive device 100 includes the gear unit 3. Specifically, the gear unit 3 is mounted on the +Y-axis side of the first shaft 210 and transmits the power of the motor unit 2 to the output shaft Ds. The gear unit 3 includes a reduction gear 31 and a differential gear 32.

[0031] <1-3-1. Speed Reducer 31> The reduction gear 31 is connected to the motor shaft 1, specifically, to the +Y-axis side of the first shaft 210. The reduction gear 31 reduces the rotational speed of the motor shaft 1, thereby increasing the torque output from the motor unit 2 in accordance with the reduction ratio. The reduction gear 31 transmits the torque output from the motor unit 2 to the differential device 32.

[0032] The reduction gear 31 has a second shaft 310. The second shaft 310 is cylindrical and extends in the Y-axis direction, and is connected to the end of the first shaft 210 on the +Y-direction side. As described above, the gear portion 3 has a second shaft 310. The second shaft 310 can rotate together with the first shaft 210 around the rotation axis J1. In this embodiment, the second shaft 310 is inserted into the end of the first shaft 210 on the +Y-direction side and is connected by spline fitting. However, this is not limited to this example, and the two can be connected by, for example, a threaded coupling using a male thread and a female thread, or can be joined by a fixing method such as pressing in or welding. In the case of a fixing method such as pressing in or welding, a serration of a concave portion and a convex portion extending in the Y-axis direction can also be used. By adopting this structure, rotation can be reliably transmitted.

[0033] The second shaft 310 includes a second cylindrical portion 3101 and a second hollow portion 3102. The second cylindrical portion 3101 extends in the Y-axis direction along the rotation axis J1. The end of the second cylindrical portion 3101 on the -Y direction side is inserted and connected to the end of the first cylindrical portion 2101 on the +Y direction side. The second hollow portion 3102 is a space enclosed by the second cylindrical portion 3101, disposed within the second cylindrical portion 3101, and connected to the first hollow portion 2102.

[0034] The reduction gear 31 also includes a main drive gear 311, an intermediate driven gear 312, and a final drive gear 313. The main drive gear 311 is rotatable together with the motor shaft 1 about the rotation axis J1. The intermediate driven gear 312 meshes with the main drive gear 311. The final drive gear 313 meshes with a ring gear 321 of the differential device 32, which will be described later. The reduction gear 31 also includes an intermediate shaft 314. The torque output from the motor unit 2 is transmitted to the ring gear 321 of the differential device 32 via the second shaft 310, the main drive gear 311, the intermediate driven gear 312, the intermediate shaft 314, and the final drive gear 313.

[0035] The main drive gear 311 is disposed on the outer circumferential surface of the motor shaft 1, specifically, on the radially outer side of the second shaft-tube portion 3101. The main drive gear 311 may be the same component as the second shaft-tube portion 3101, or a different component. In the latter case, the main drive gear 311 is securely fixed to the second shaft-tube portion 3101 by shrink fit or other means.

[0036] The intermediate driven gear 312 and the final drive gear 313 are rotatable together with the intermediate shaft 314 about an intermediate axis J2 extending in the Y-axis direction.

[0037] The intermediate axis J2 is preferably located closer to the −X direction than the rotation axis J1 and closer to the +X direction than the differential axis J3 , and closer to the −Z direction than the rotation axis J1 and the differential axis J3 . Figure 7 : is a conceptual diagram showing an example of the configuration of the intermediate axis J2. Figure 7 Observe the configuration of the intermediate axis J2 from the +Y direction toward the -Y direction. Observe from the Y-axis direction, the minimum fourth angle θd formed by the fifth line segment L5 and the sixth line segment L6 is an obtuse angle. In addition, the fifth line segment L5 is an imaginary line segment connecting the intermediate axis J2 and the rotation axis J1. The sixth line segment L6 is an imaginary line segment connecting the intermediate axis J2 and the differential axis J3. By configuring the intermediate axis J2 between the rotation axis J1 and the differential axis J3 in the X-axis direction and at a position closer to the -Z direction side than the differential axis J3, and making the fourth angle θd an obtuse angle, the intermediate axis J2 can be made closer to the rotation axis J1 and the differential axis J3 in the Z-axis direction. Therefore, the interval between the rotation axis J1 and the differential axis J3 and the intermediate axis J2 in the Z-axis direction can be made narrower. As a result, the size of the gear portion 3 in the Z-axis direction can be further reduced, and thus the drive device 100 can be further miniaturized in the Z-axis direction. However, Figure 7 The examples do not exclude a structure in which the intermediate axis J2 is arranged on the +X direction side relative to the rotation axis J1, a structure in which the intermediate axis J2 is arranged on the -X direction side relative to the differential axis J3, or a structure in which the intermediate axis J2 is not arranged on the -Z direction side relative to the differential axis J3.

[0038] The intermediate shaft 314 extends along an intermediate axis J2 extending in the Y-axis direction and is rotatable about the intermediate axis J2. The intermediate axis J2 is parallel to the rotation axis J1. The intermediate driven gear 312 and the final drive gear 313 are arranged on the outer circumference of the intermediate shaft 314. At least one of the intermediate driven gear 312 and the final drive gear 313 may be the same component as the intermediate shaft 314 or a separate component. In the latter case, at least one of the intermediate driven gear 312 and the final drive gear 313 is securely fixed to the intermediate shaft 314 by shrink fit or the like.

[0039] The torque of the first shaft 210 is transmitted to the main drive gear 311 via the second shaft 310, and then from the main drive gear 311 to the counter driven gear 312. Furthermore, the torque transmitted to the counter driven gear 312 is transmitted to the final drive gear 313 via the intermediate shaft 314. Furthermore, the torque is transmitted from the final drive gear 313 to the ring gear 321 of the differential device 32.

[0040] <1-3-2. Differential Gear 32> The differential device 32 is mounted on the output shaft Ds. As described above, the gear unit 3 includes the differential device 32. The differential device 32 includes a ring gear 321. The ring gear 321 is rotatable about the differential axis J3 extending in the Y-axis direction. In this embodiment, the differential axis J3 is located closer to the -X direction and the -Z direction than the rotation axis J1. Furthermore, the X-axis is perpendicular to the Y-axis. The Z-axis is perpendicular to both the Y-axis and the X-axis. The ring gear 321 transmits the torque transmitted from the motor unit 2 to the differential device 32 via the reduction gear 31 to the output shaft Ds. The output shafts Ds are mounted on the +Y direction and -Y direction sides of the differential device 32, respectively. A drive wheel of the vehicle 300 is mounted on each output shaft Ds. For example, when the vehicle 300 turns, the differential device 32 absorbs the speed difference between the output shafts Ds on the +Y direction and -Y direction sides and transmits torque to each output shaft Ds.

[0041] <1-4. Housing 4> Below, refer to Figures 1 to 5 The housing 4 will be described in detail. The housing 4 houses the motor shaft 1. In addition, the housing 4 also houses the motor unit 2 and the gear unit 3. As described above, the drive device 100 includes the housing 4. Specifically, the housing 4 includes a motor housing portion 401 for housing the motor unit 2 and a gear housing portion 402 for housing the gear unit 3. The motor housing portion 401 is a space surrounded by the housing cylinder portion 41, the partition wall 42, and the motor side cover portion 44, and houses the rotor 21, the stator 22, and the like. The gear housing portion 402 is a space surrounded by the partition wall 42 and the gear side cover portion 43 described later, and houses the reduction gear 31, the differential device 32, and the like.

[0042] A fluid reservoir P for accumulating fluid F is disposed at the lower portion of the gear housing 402. A portion of the differential device 32 is immersed in the fluid reservoir P. The fluid F accumulated in the fluid reservoir P is stirred by the operation of the differential device 32 and supplied to the interior of the gear housing 402. For example, in this embodiment, a portion of the ring gear 321 on the -Z direction side is disposed inside the fluid reservoir P on the -Z direction side of the gear housing 402 (see FIG. 1 ). Figure 1 When the ring gear 321 of the differential device 32 rotates, the fluid F is stirred by the tooth surfaces of the ring gear 321. The stirred fluid F is supplied to the gears and bearings of the reduction gear 31 and the differential device 32 within the gear housing 402, providing lubrication and cooling to the target locations.

[0043] The housing 4 includes a cylindrical housing portion 41, a partition wall 42, a motor-side cover portion 44, and a gear-side cover portion 43. In this embodiment, these components are formed using a metal material such as iron, aluminum, or alloys thereof. Furthermore, to prevent contact corrosion between dissimilar metals at contact points, they are preferably formed using the same material. However, this is not limiting; they may be formed using materials other than metal, and at least some of them may be formed using different materials.

[0044] <1-4-1. Housing Tubular Portion 41> The housing cylindrical portion 41 extends in the Y-axis direction and houses the motor unit 2. As described above, the housing 4 includes the housing cylindrical portion 41. The motor unit 2, the fluid supply component 762 (described later), and the like are arranged inside the housing cylindrical portion 41. Furthermore, the stator core 221 is fixed to the inner side surface of the housing cylindrical portion 41.

[0045] <1-4-2. Partition wall 42> The partition wall 42 extends in a direction intersecting the rotation axis J1. As described above, the shell 4 has a partition wall 42. The partition wall 42 closes the end of the shell cylinder 41 on the +Y direction side. In this embodiment, the partition wall 42 extends in a direction perpendicular to the Y-axis direction. In addition, the shell cylinder 41 and the partition wall 42 are different parts of the same component. By forming the two into one piece, their rigidity can be improved. However, this is not limited to this example, and the shell cylinder 41 and the partition wall 42 can also be separate.

[0046] The partition wall 42 includes a partition wall through-hole 4201, through which the motor shaft 1 is inserted, a first output shaft through-hole 4202, and an opening 4203. The partition wall through-hole 4201, the first output shaft through-hole 4202, and the opening 4203 extend through the partition wall 42 in the Y-axis direction. The center of the partition wall through-hole 4201 coincides with the rotation axis J1. The motor shaft 1 is inserted through the partition wall through-hole 4201. The center of the first output shaft through-hole 4202 coincides with the differential axis J3. The output shaft Ds on the -Y direction side is inserted through the first output shaft through-hole 4202. An oil seal (not shown) is arranged in the gap between the output shaft Ds and the first output shaft through-hole 4202 to seal the gap between them. The term "sealing" refers to the close contact between different components to prevent, for example, leakage of fluid F from within the components to the outside and to prevent intrusion of foreign matter such as water, dust, and dirt from the outside. The same applies to the following regarding sealing. Opening 4203 is located on the -Z side of partition wall 42, connecting motor housing 401 and gear housing 402. Fluid F that has flowed onto the -Z side of motor housing 401 flows from opening 4203 into gear housing 402, lubricates and cools a portion of gear unit 3, and then accumulates in fluid reservoir P.

[0047] The partition wall 42 further includes a first motor bearing retaining portion 421 , a first gear bearing retaining portion 422 , a first intermediate bearing retaining portion 423 , and a first output bearing retaining portion 424 .

[0048] The first motor bearing retaining portion 421 is disposed on the end surface on the -Y direction side of the partition wall 42. The first motor bearing retaining portion 421 is disposed along the outer edge of the -Y direction end of the partition wall through-hole 4201. The housing 4 includes the first motor bearing retaining portion 421. The first motor bearing retaining portion 421 rotatably retains the +Y direction end of the first shaft 210 via the first motor bearing 4211. The first motor bearing retaining portion 421 is an example of a "bearing retaining portion" in the present invention, and the first motor bearing 4211 is an example of a "bearing" in the present invention.

[0049] The first gear bearing retaining portion 422, the first intermediate bearing retaining portion 423, and the first output bearing retaining portion 424 are arranged on the +Y-side end surface of the partition wall 42. The first gear bearing retaining portion 422 is arranged along the outer edge of the +Y-side end of the partition wall through-hole 4201 and rotatably retains the -Y-side end of the second shaft 310 via a first gear bearing 4221. The first intermediate bearing retaining portion 423 rotatably retains the -Y-side end of the intermediate shaft 314 via a first intermediate bearing 4231. The first output bearing retaining portion 424 is arranged along the outer edge of the +Y-side end of the first output shaft through-hole 4202 and rotatably retains the -Y-side output shaft Ds via a first output bearing 4241.

[0050] Furthermore, the partition wall 42 includes a third flow path 73, which will be described later, of the fluid flow path 7. The third flow path 73 will be described later.

[0051] <1-4-3. Gear side cover 43> The gear-side cover 43 is a covered, cylindrical component. The cover portion (reference numeral omitted) of the gear-side cover 43 extends in a direction intersecting the rotation axis J1. The cylindrical portion (reference numeral omitted) of the gear-side cover 43 extends in the Y-axis direction. As described above, the housing 4 includes the gear-side cover 43. The gear-side cover 43 is positioned at the +Y-direction end of the partition wall 42 and, together with the partition wall 42, forms the gear storage portion 402 that houses the gear unit 3.

[0052] The gear side cover 43 is detachably mounted on the end portion of the partition wall 42 on the +Y direction side. The gear side cover 43 can be fixed to the partition wall 42 using screws, for example, but is not limited to this method. A wide range of methods, such as screwing or press-fitting, can be used to securely secure the gear side cover 43 to the partition wall 42. This allows the gear side cover 43 to adhere tightly to the partition wall 42. Tight adhesion refers to a degree of sealing that prevents leakage of the fluid F within the component and prevents intrusion of foreign matter such as water, dust, and dirt. The same applies to the following regarding tight adhesion.

[0053] The gear-side cover 43 has a second output shaft through-hole 4301. The center of the second output shaft through-hole 4301 is aligned with the differential axis J3. The +Y-direction output shaft Ds is inserted through the second output shaft through-hole 4301. An oil seal (not shown) is positioned in the gap between the output shaft Ds and the second output shaft through-hole 4301 to seal the gap.

[0054] The gear-side cover 43 also includes a second gear bearing retaining portion 431, a second intermediate bearing retaining portion 432, and a second output bearing retaining portion 433. The second gear bearing retaining portion 431, the second intermediate bearing retaining portion 432, and the second output bearing retaining portion 433 are arranged on the -Y direction side of the gear-side cover 43. The second gear bearing retaining portion 431 rotatably retains the +Y direction end of the second shaft 310 via a second gear bearing 4311. The second intermediate bearing retaining portion 432 rotatably retains the +Y direction end of the intermediate shaft 314 via a second intermediate bearing 4321. The second output bearing retaining portion 433 is arranged along the outer edge of the -Y direction end of the second output shaft through-hole 4301 and rotatably retains the +Y direction end of the output shaft Ds via the second output bearing 4331.

[0055] In addition, the gear side cover portion 43 has a tray portion 434 (see, for example, Figure 1The tray portion 434 is disposed on the -Y side of the gear side cover portion 43 and includes a recess (noted) that is recessed in the -Z direction (vertically downward) and one or more holes 4341. The holes 4341 extend through the tray portion 434. The fluid F stirred up by the ring gear 321 accumulates in the tray portion 434 and then flows out through the holes 4341 to be supplied to the various gears, bearings, etc. within the gear housing 402, thereby lubricating or cooling them.

[0056] Furthermore, the gear-side cover portion 43 includes a fifth flow path 75, which will be described later, of the fluid flow path 7. The fifth flow path 75 will be described later.

[0057] <1-4-4. Motor side cover 44> The motor-side cover 44 is detachably attached to the -Y-side end of the housing tube 41, sealing and obstructing the -Y-side end of the housing tube 41. The motor-side cover 44 can be secured to the housing tube 41 using screws, for example, but is not limited to this method. A wide variety of secure securing methods, such as screwing or press-fitting, can be employed. This ensures that the motor-side cover 44 adheres tightly to the housing tube 41.

[0058] The motor-side cover 44 includes a second motor bearing retaining portion 441. The second motor bearing retaining portion 441 is located on the +Y direction side of the motor-side cover 44. The housing 4 includes the second motor bearing retaining portion 441. The second motor bearing retaining portion 441 rotatably retains the -Y direction end portion of the first shaft 210 via a second motor bearing 4411. The second motor bearing retaining portion 441 is another example of a "bearing retaining portion" according to the present invention, and the second motor bearing 4411 is another example of a "bearing" according to the present invention.

[0059] <1-5. Pump 5, Cooler 6, and Fluid Flow Path 7> Next, refer to Figures 1 to 5 , the pump 5 , cooler 6 , and fluid flow path 7 are described. As described above, the drive device 100 includes the pump 5 , cooler 6 , and fluid flow path 7 . The pump 5 pumps the fluid F in the housing 4 . The cooler 6 cools the fluid F. The fluid F flows in the fluid flow path 7 .

[0060] The pump 5 is an electric pump driven by an inverter unit (not shown). The pump 5 can be a DC pump, a centrifugal pump, etc. The pump 5 is fixed to the housing cylinder 41. For example, Figure 4As shown, the pump 5 has a plurality of fixing portions 50 fixed to the housing cylinder 41. The fixing portions 50 are arranged along the outer edge of the pump 5 as viewed from the Y-axis direction. A through hole (symbol omitted) extending in the Y-axis direction is formed on the fixing portion 50. A bolt extending in the Y-axis direction is inserted into the through hole. The pump 5 is fixed to the housing 4 by screwing the bolt with, for example, the housing cylinder 41 of the housing 4. Here, the third line segment L3 is an imaginary line segment connecting the two protrusions 223 arranged at the position closest to the pump 5 when viewed from the Y-axis direction. The fourth line segment L4 is an imaginary line segment connecting the two fixing portions 50 arranged at the position closest to the stator 22 when viewed from the Y-axis direction. At this time, it is preferred that the third line segment L3 is parallel to the fourth line segment L4 when viewed from the Y-axis direction. Thus, since the protrusion 223 of the stator 22 and the fixing portion 50 of the pump 5 are not arranged between the third line segment L3 and the fourth line segment L4 when viewed in the Y-axis direction, the radial distance between the stator 22 and the pump 5 can be further reduced. Consequently, the drive device 100 can be further miniaturized.

[0061] In addition, if Figure 4 As shown, the pump 5 is arranged at a position closer to the -X direction side than the rotation axis J1 and closer to the +X direction side than the differential axis J3. In addition, in this embodiment, the pump 5 is arranged at a position closer to the -Z direction side than the differential axis J3. By arranging the pump 5 between the rotation axis J1 of the motor shaft 1 and the differential axis J3 of the ring gear 321 (or the output shaft Ds) in the X-axis direction, it is easy to arrange the inlet of the filter of the pump 5 (that is, one end of the first flow path 71 described later) in the center of the gear storage portion 402 in the X-axis direction of the gear storage portion 3. Therefore, for example, even if the drive device 100 is tilted about the Y-axis direction, the inlet of the filter of the pump 5 (one end of the first flow path 71) is difficult to leave the liquid surface of the fluid storage portion P on the -Z direction side of the gear storage portion 402. Therefore, even if the drive device 100 is tilted, the pump 5 can continue to draw fluid F from the fluid storage portion P.

[0062] The fluid flow path 7 supplies a portion of the fluid F accumulated in the fluid reservoir P of the gear housing 402 into the motor shaft 1 and supplies the remaining portion to the exterior of the motor unit 2. The pump 5 and the cooler 6 are disposed midway along the fluid flow path 7. That is, the fluid F drawn by the pump 5 passes through the cooler 6 and is then supplied to the interior of the motor shaft 1 and the exterior of the motor unit 2.

[0063] The fluid flow path 7 includes a first flow path 71, a second flow path 72, a third flow path 73, a fourth flow path 74, a fifth flow path 75, and a sixth flow path 76. The first flow path 71 connects the gear housing 402 and the first inlet 51 of the pump 5. The second flow path 72 connects the first outlet 52 of the pump 5 and one end of the third flow path 73 via the cooler 6. The third flow path 73 is arranged inside the partition wall 42 and extends in a direction intersecting the rotation axis J1. The fourth flow path 74 connects the other end of the third flow path 73 and one end of the fifth flow path 75. The fifth flow path 75 is arranged inside the gear side cover 43. The other end of the fifth flow path 75 is connected to the end of the second shaft 310 on the +Y direction side. One end of the sixth flow path 76 is connected to the other end of the third flow path 73. The other end of the sixth flow path 76 is arranged inside the housing cylindrical portion 41.

[0064] In this way, the fluid F sent out from the pump 5 and flowing in the third flow path 73 can be provided to the interior of the motor unit 2 through the fourth flow path 74, the fifth flow path 75, the interior of the second shaft 310, and the interior of the first shaft 210, and can be provided to the outside of the motor unit 2 (for example, the stator 22) through the sixth flow path 76. That is, the same pump 5 can be used to provide fluid F to the inside and outside of the motor unit 2 through different flow paths such as the fourth flow path 74, the fifth flow path 75, and the sixth flow path 76. Therefore, since there is no need to carry multiple pumps 5, the drive device 100 can be further miniaturized. Furthermore, since the manufacturing cost and the number of manufacturing processes can be reduced, the productivity of the drive device 100 can be improved. In addition, the fourth flow path 74 and the sixth flow path 76 that supply fluid F to the inside and outside of the motor unit 2 branch at the other end of the third flow path 73, so that the fluid flow path 7 can be simplified. Furthermore, by connecting the second flow path 72 passing through the cooler 6 to one end of the third flow path 73 inside the partition wall 42 , the cooled fluid F can be supplied to the inside and outside of the motor unit 2 via a shorter route.

[0065] The first inlet 51 of the pump 5 is inserted into one end of the first flow path 71. A filter is connected to the other end of the first flow path 71. The filter is arranged at a position closer to the -Z direction than the differential axis J3, and is arranged at a position closer to the -Z direction than the liquid level of the fluid accumulation part P. In this embodiment, it is arranged in the fluid accumulation part P of the gear storage part 402. In detail, the inlet of the filter (not shown) is arranged at a position closer to the -Z direction (i.e., vertically below) than the liquid level of the fluid accumulation part P. As a result, air can be prevented from flowing into the first flow path 71. In addition, by arranging the filter closer to the -Z direction than the differential axis J3, the first flow path 71 can be made shorter, thereby reducing the flow path resistance acting on the fluid F flowing in the first flow path 71. The fluid F is sucked in from the inlet of the filter by the drive of the pump 5, and is provided to the first inlet 51 of the pump 5 through the first flow path 71, and is sucked by the pump 5. A filtering structure such as filter paper (not shown) is installed on the filter. By installing the filter structure, it is possible to suppress the mixing of foreign matter into the pump 5 and the motor unit 2 .

[0066] The second flow path 72 is arranged radially outside the motor housing portion 401 and connects the pump 5 and the cooler 6 .

[0067] Figure 8 It is an enlarged view of the second flow path 72. In addition, Figure 8 Enlarged view of Figure 4 One end of the second flow path 72 is connected to the first outlet 52 of the pump 5. The pump 5 delivers the fluid F sucked from the first inlet 51 from the first outlet 52 to the cooler 6 via the second flow path 72.

[0068] The second flow path 72 is connected to the third flow path 73 through the interior of the cooler 6. A refrigerant RE, such as water, supplied from the outside is supplied to the cooler 6 via a path different from the second flow path 72. The cooler 6 performs heat exchange between the fluid F and the refrigerant RE, thereby reducing the temperature of the fluid F flowing in the second flow path 72.

[0069] Here, the pump 5 and the cooler 6 are respectively arranged on the radially outer side of the housing cylindrical portion 41 and arranged along the circumferential direction Dr. The cooler 6 is arranged at a position closer to one circumferential direction Dr1 than the pump 5. This allows the flow path between the pump 5 and the cooler 6 to be further shortened. In this embodiment, when viewed from the Y-axis direction, the pump 5 is arranged at a position closer to the other circumferential direction Dr2 than the first imaginary line Lv1 passing through the rotation axis J1 and the radial outer end of the protrusion 223. When viewed from the Y-axis direction, the cooler 6 is arranged at a position closer to one circumferential direction Dr1 than the first imaginary line Lv1. In this way, since the pump 5 and the cooler 6 are not arranged on the first imaginary line Lv1 in the Y-direction, the radial distance between the pump 5 and the cooler 6 and the rotation axis J1 can be further reduced. Therefore, the drive device 100 can be further miniaturized. However, the circumferential arrangement of the pump 5 and the cooler 6 is not limited to this example. For example, the cooler 6 can also be arranged closer to the other circumferential direction Dr2 than the pump 5.

[0070] More preferably, when viewed from the Y-axis direction, the first imaginary line Lv1 intersects a second imaginary line Lv2 extending from the rotation axis J1 toward a connection portion Cp1, described later. Furthermore, the connection portion Cp1, as described later, is the portion connecting the first fluid path 721 and the second fluid path 722. This allows the connection portion Cp1 to be radially closer to the rotation axis J1, further reducing the radial dimension of the housing cylindrical portion 41. Consequently, the drive device 100 can be further miniaturized.

[0071] In addition, preferably Figure 3 As shown, the first inlet 51 of the pump 5 is arranged on the +Y direction side of the pump 5. The first outlet 52 of the pump 5 is arranged on the -Y direction side of the pump 5. The second inlet 61 of the cooler 6 is arranged on the -Y direction side of the cooler 6 and is connected to the first outlet 52 of the pump 5. The second outlet 62 of the cooler 6 is arranged on the +Y direction side of the cooler 6 and is connected to the third flow path 73.

[0072] By configuring the first inlet 51 on the +Y direction side of the pump 5 and the first outlet 52 on the -Y direction side, the width of the pump 5 in the circumferential direction Dr can be further reduced. In addition, by configuring the second inlet 61 on the -Y direction side of the cooler 6 and the second outlet 62 on the +Y direction side, the width of the cooler 6 in the circumferential direction Dr can be further reduced. Therefore, the pump 5 and the cooler 6 can be configured more compactly. In addition, by connecting the first outlet 52 and the second inlet 61 on the -Y direction side, the portion connecting the first outlet 52 and the second inlet 61 in the second flow path 72 can be made shorter. Therefore, the flow path connecting the first outlet 52 of the pump 5 and the second inlet 61 of the cooler 6 can be further shortened.

[0073] However, the arrangement of the first inlet 51 and first outlet 52 of the pump 5 and the second inlet 61 and second outlet 62 of the cooler 6 is not limited to the above example. That is, the above example does not exclude a configuration in which the first inlet 51 is not arranged on the +Y direction side of the pump 5, the first outlet 52 is not arranged on the -Y direction side of the pump 5, the second inlet 61 is not arranged on the -Y direction side of the cooler 6, and the second outlet 62 is not arranged on the +Y direction side of the cooler 6.

[0074] In addition, preferably Figure 3 As shown, the second inlet 61 of the cooler 6 is arranged on the -Y direction side of the cooler 6 and the circumferential side of the other side Dr2. The second outlet 62 of the cooler 6 is arranged on the +Y direction side of the cooler 6 and the circumferential side Dr1. In this way, in the cooler 6, the second inlet 61 and the second outlet 62 can be arranged on a diagonal line, for example, in a top view observed from the radial direction. Therefore, since the interval between the second inlet 61 and the second outlet 62 can be made longer, the portion of the second flow path 72 arranged in the cooler 6 can be made longer. Therefore, the fluid F can be fully cooled by the cooler 6. However, the configuration of the second inlet 61 and the second outlet 62 of the cooler 6 is not limited to the above-mentioned example. That is, the above-mentioned example does not exclude the structure in which the second inlet 61 is not arranged on the -Y direction side of the cooler 6 and the circumferential side Dr2, and the structure in which the second outlet 62 is not arranged on the +Y direction side of the cooler 6 and the circumferential side Dr1.

[0075] Next, as described above, the third flow path 73 is formed within the partition wall 42. The other end of the third flow path 73 is positioned closer to the +Z direction than the one end of the third flow path 73. Preferably, the third flow path 73 extends linearly from the one end toward the other end when viewed axially. This further shortens the flow path length of the third flow path 73.

[0076] As described above, the fourth flow path 74 connects the other end of the third flow path 73 with one end of the fifth flow path 75. The fourth flow path 74 has a third inlet 741. The third inlet 741 is disposed on the partition wall 42. In other words, the partition wall 42 has the third inlet 741. The third inlet 741 is a hole extending in the -Y direction from the end surface of the partition wall 42 on the +Y direction side, and connects the other end of the third flow path 73 with one end of the fourth flow path 74.

[0077] The fourth flow path 74 has a third outlet 742. The third outlet 742 of the fourth flow path 74 is disposed in the gear side cover 43. In other words, the gear side cover 43 has the third outlet 742. The third outlet 742 connects the other end of the fourth flow path 74 and one end of the fifth flow path 75.

[0078] In addition, the fourth flow path 74 includes a tank 8. The tank 8 will be described later.

[0079] Next, as described above, the fifth flow path 75 is formed inside the gear-side cover 43. The other end of the fifth flow path 75 is connected to the second gear bearing retaining portion 431. A portion of the fluid F that flows into the second gear bearing retaining portion 431 through the fifth flow path 75 lubricates and cools the second gear bearing 4311. Furthermore, another portion of the fluid F that flows into the second gear bearing retaining portion 431 through the fifth flow path 75 flows into the interior of the motor shaft 1 from the end portion on the +Y direction side of the second shaft 310 and is supplied to the motor unit 2.

[0080] Here, a supply limiting component 751 is arranged on the second gear bearing retaining portion 431. In other words, the housing 4 includes a supply limiting component 751. The supply limiting component 751 limits the amount of fluid F provided from the fifth flow path 75 to the second gear bearing 4311. Through this restriction, it is possible to ensure that the fluid F is provided from the fifth flow path 75 to the motor part 2 side through the second hollow portion 3102 of the second shaft 310. The supply limiting component 751 has an annular portion (symbol omitted) opposite to the second gear bearing 4311 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 through the end of the +Y direction side of the second shaft 310. The annular portion has a through hole (symbol omitted) that penetrates the annular portion in the Y-axis direction. The fluid F is provided to the second gear bearing 4311 through the through hole, and is provided to the inside of the second shaft 310 through the cylindrical portion.

[0081] Next, the sixth flow path 76 includes an internal flow path 761. Internal flow path 761 is a flow path for the fluid F formed inside the partition wall 42. One end of internal flow path 761 is connected to the other end of the third flow path 73. The other end of internal flow path 761 opens at the end surface on the -Y direction side of the partition wall 42. In this embodiment, internal flow path 761 is a portion on the one end side of the sixth flow path 76.

[0082] The sixth flow path 76 also includes a fluid supply component 762. The fluid supply component 762 is arranged radially outward from the stator 22 and supplies fluid F to the stator 22. In this embodiment, the fluid supply component 762 is a portion on the other end side of the sixth flow path 76. The fluid supply component 762 is housed in the motor housing 401. The end of the fluid supply component 762 on the +Y direction side is connected to the other end of the internal flow path 761. The end of the fluid supply component 762 on the -Y direction side is fixed to the motor-side cover 44.

[0083] In this embodiment, the fluid supply member 762 is cylindrical and extends in the Y-axis direction. However, this is not limiting. The fluid supply member 762 may also be in the shape of a tray, having a recessed portion in the -Z direction (vertically downward) and open in the +Z direction (vertically upward). The fluid F supplied from the third flow path 73 to the sixth flow path 76 flows within the fluid supply member 762.

[0084] The fluid supply component 762 has at least one supply hole 763. The supply hole 763 opens toward at least one of the stator 22, the first motor bearing 4211, and the second motor bearing 4411. The supply hole 763 is a hole that passes through the fluid supply component 762. For example, in this embodiment, multiple supply holes 763 are arranged side by side along the Y-axis direction. The supply hole 763 arranged closest to the +Y direction side opens toward the first motor bearing 4211. The supply hole 763 arranged closest to the -Y direction side opens toward the second motor bearing 4411. In the Y-axis direction, the supply holes 763 arranged between them open toward the radially outer surface of the stator 22 or the Y-axis end of the stator 22 (e.g., the coil end 2221). In this way, the supply hole 763 can supply the fluid F flowing out of the supply hole 763 to at least one of the stator 22, the first motor bearing 4211, and the second motor bearing 4411. Therefore, these components can be cooled and lubricated.

[0085] Here, the fluid flow path 7 branches into a fourth flow path 74 and a sixth flow path 76 at the other end of the third flow path 73. It is preferred that the minimum flow path cross-sectional area in the fourth flow path 74 is narrower than the minimum flow path cross-sectional area in the sixth flow path 76. In addition, the minimum flow path cross-sectional area in the third flow path 73 is wider than the minimum flow path cross-sectional area in the sixth flow path 76. For example, the diameter of the third inlet 741 of the fourth flow path 74 is smaller than the smaller of the inner diameter of the internal flow path 761 in the sixth flow path 76 and the inner diameter of the fluid supply component 762. In addition, the inner diameter of the third flow path 73 is larger than the smaller of the inner diameter of the internal flow path 761 in the sixth flow path 76 and the inner diameter of the fluid supply component 762. By making the minimum flow path cross-sectional area in the fourth flow path 74 narrower than the sixth flow path 76, the fluid pressure drop of the fluid F flowing in the third flow path 73 can be reduced. Therefore, for example, even if the fluid supply member 762 is located in the +Z direction (vertically above) relative to the third inlet 741 of the fourth flow path 74 or the viscosity of the fluid F is higher, the fluid F can be sufficiently supplied to the fluid supply member 762 through the sixth flow path 76. However, this example does not exclude a configuration in which the minimum flow path cross-sectional area in the fourth flow path 74 is not narrower than the minimum flow path cross-sectional area in the sixth flow path 76, or a configuration in which the minimum flow path cross-sectional area in the third flow path 73 is not wider than the minimum flow path cross-sectional area in the sixth flow path 76.

[0086] In addition to this, the fluid flow path 7 may further include a flow path that supplies the fluid F flowing in the sixth flow path 76 to the end portion on the −Y direction side of the motor shaft 1 . Figure 9 : is a schematic diagram showing a modified example of the drive device 100 viewed from the X-axis direction. Figure 9 The structure of the driving device 100a of the modified example is observed from the -X direction to the +X direction. Figure 1 This is only a conceptual diagram, and the arrangement and dimensions of each component are not necessarily the same as those of the actual driving device 100 a .

[0087] exist Figure 9 In the embodiment, the fluid flow path 7a further includes a seventh flow path 77. One end of the seventh flow path 77 is connected to the -Y end of the sixth flow path 76. The other end of the seventh flow path 77 is connected to the -Y end of the first shaft 210. Specifically, the seventh flow path 77 is disposed within the motor-side cover 44 and connected to the second motor bearing retaining portion 441. In other words, the motor-side cover 44 includes the seventh flow path 77. A portion of the fluid F flowing from the sixth flow path 76 into the seventh flow path 77 is supplied to the second motor bearing 4411, lubricating and cooling the second motor bearing 4411. Furthermore, the other end of the seventh flow path 77 is connected to the -Y end of the first shaft 210 via the second motor bearing retaining portion 441. Another portion of the fluid F flowing from the sixth flow path 76 to the seventh flow path 77 is supplied to the interior of the motor unit 2 via the second motor bearing retaining portion 441. This allows the fluid F to be supplied to the -Y direction of the first shaft 210 via the sixth and seventh flow paths 76 and 77. Therefore, a sufficiently large amount of fluid F can be supplied to the interior of the motor unit 2 .

[0088] In addition, Figure 9 In the embodiment, a supply limiting member 771 is disposed in the second motor bearing retaining portion 441. In other words, the housing 4 includes the supply limiting member 771. The supply limiting member 771 limits the amount of fluid F supplied from the seventh flow path 77 to the second motor bearing 4411. This restriction ensures that the fluid F is supplied from the seventh flow path 77 to the interior of the motor unit 2 through the first hollow portion 2102 of the first shaft 210. The supply limiting member 771 includes an annular portion (symbol omitted) that is opposed to the second motor bearing 4411 in the Y-axis direction, and a cylindrical portion (symbol omitted) that extends from the radially inner end of the annular portion in the -Y direction and is inserted into the -Y-side end of the first shaft 210. The annular portion includes a through-hole (symbol omitted) that extends through the annular portion in the Y-axis direction. The fluid F is supplied to the second motor bearing 4411 through the through-hole and is supplied to the interior of the first shaft 210 through the cylindrical portion.

[0089] <1-6. Second Flow Path 72> Next, refer to Figures 4 and 5 and Figure 8, a more detailed structure of the second flow path 72 is described.

[0090] The second flow path 72 includes a first fluid path 721 and a second fluid path 722. The first fluid path 721 and the second fluid path 722 extend in a straight line respectively. One end of the first fluid path 721 is connected to the pump 5. The other end of the first fluid path 721 is connected to the second fluid path 722, and is connected to the cooler 6 via the second fluid path 722. In detail, the first fluid path 721 and the second fluid path 722 are arranged inside the shell cylinder 41. The other end of the first fluid path 721 is connected to the portion between the two ends of the second fluid path 722. The other end of the second fluid path 722 is open to the radial outer side surface of the shell cylinder 41. In order to prevent leakage of the fluid F, one end of the second fluid path 722 is blocked by a sealing plug 7221.

[0091] In addition, the second flow path 72 includes a third fluid path 723, a fourth fluid path 724 and a fifth fluid path 725. The third fluid path 723 is arranged inside the shell cylinder 41, connecting one end of the second fluid path 722 and the second inlet 61 of the cooler 6. The fourth fluid path 724 is arranged inside the cooler 6, connecting the third fluid path 723 and the fifth fluid path 725. In this embodiment, one end of the fourth fluid path 724 is the second inlet 61, and the other end of the fourth fluid path 724 is the second outlet 62. The fluid F flowing in the fourth fluid path 724 is cooled by heat exchange with the refrigerant RE of other piping. The fifth fluid path 725 is arranged inside the shell cylinder 41, connecting the second outlet 62 of the cooler 6 and one end of the third flow path 73.

[0092] When viewed from the Y-axis direction, the direction in which the first fluid path 721 extends intersects the direction in which the second fluid path 722 extends. Figure 8 As shown, the first line segment L1 is a virtual line segment connecting the connection portion Cp1 of the first fluid path 721 and the second fluid path 722 and one end of the first fluid path 721. The second line segment L2 is a virtual line segment connecting the connection portion Cp1 and the end of the second fluid path 722 on the cooler 6 side. When viewed from the Y-axis direction, the minimum first angle θa formed between the first line segment L1 and the second line segment L2 is oriented toward the rotation axis J1.

[0093] Since the direction in which the first fluid path 721 extends intersects the direction in which the second fluid path 722 extends, the minimum first angle θa formed by the first line segment L1 and the second line segment L2 is greater than 0 degrees and less than 180 degrees. Furthermore, when viewed from the Y-axis direction, the first angle θa is directed toward the rotation axis J1. As a result, the width between the radially inner end and the radially outer end of the space occupied by the first fluid path 721 and the second fluid path 722 can be further reduced. Therefore, the radial dimension of the housing cylindrical portion 41 can be further reduced. In addition, the pump 5 and the cooler 6 arranged in the circumferential direction can be arranged at a position closer to the radial inside. Therefore, the drive device 100 can be further miniaturized.

[0094] Preferably, the first angle θa is an obtuse angle (see Figure 8 ). By making the first angle θa an obtuse angle, the first fluid path 721 and the second fluid path 722 can be made closer to the motor housing portion 401 in the radial direction. In addition, when the first fluid path 721 and the second fluid path 722 are formed in the shell cylinder 41, if the first angle θa is an acute angle, it is necessary to make the connection portion Cp1 of the first fluid path 721 and the second fluid path 722 farther away from the motor housing portion 401 in the radial direction. Therefore, the radial dimension of the shell cylinder 41 can be reduced, so that the drive device 100 can be further miniaturized. In addition, a sealing plug 7221 for preventing leakage of the fluid F is arranged at the radially outer end of the second fluid path 722. By making the first angle θa an obtuse angle, it is easy to make the radially outer end of the second fluid path 722 leave the cooler 6 in the circumferential direction. Therefore, it is possible to prevent the sealing plug 7221 from interfering with the cooler 6 and hindering the configuration of the cooler 6. Furthermore, since the radially outer end of the second fluid path 722 can be positioned further radially inward, an increase in the radial dimension of the housing cylindrical portion 41 can be suppressed. Consequently, an increase in the size of the drive device 100 can be suppressed. However, the above example does not exclude a configuration in which the first angle θa is a right angle or an acute angle when viewed in the Y-axis direction.

[0095] In addition, it is preferred that, when viewed from the Y-axis direction, the minimum second angle θb formed between the direction in which the first fluid path 721 extends and the direction in which the second fluid path 722 extends is smaller than the minimum third angle θc formed between the tangent direction Dt and the direction in which the first fluid path 721 extends (see FIG. Figure 8). Here, the tangent direction Dt is the direction in which the tangent Lt at the end of the second fluid path 722 on the cooler 6 side extends. The tangent Lt is tangent to the imaginary circle Cv when viewed from the Y-axis direction. The imaginary circle Cv is centered on the rotation axis J1 and passes through the end of the second fluid path 722 on the cooler 6 side. In other words, the imaginary circle Cv passes through the connecting portion Cp2 between the second fluid path 722 and the third fluid path 723. The tangent Lt touches the imaginary circle Cv at the connecting portion Cp2 between the second fluid path 722 and the third fluid path 723. By setting θb<θc, the sealing plug 7221 arranged at the radially outer end of the second fluid path 722 can be more easily separated from the cooler 6, so that the radially outer end of the second fluid path 722 can be more reliably prevented from becoming an obstacle to the configuration of the cooler 6. In addition, since the radially outer end of the second fluid path 722 can be arranged at a position closer to the radial inside, the increase in the radial dimension of the shell cylinder 41 can be suppressed. Therefore, it is possible to suppress an increase in size of the driving device 100. However, this example does not exclude a configuration in which θb≥θc is satisfied.

[0096] In addition, it is preferred that at least one of the first fluid path 721 and the second fluid path 722 extends in a direction perpendicular to the Y-axis direction. In other words, at least one of the extending direction of the first fluid path 721 and the extending direction of the second fluid path 722 is parallel to the imaginary plane Pv perpendicular to the Y-axis direction. For example, in this embodiment, Figure 5 As shown, both the direction in which the first fluid path 721 and the direction in which the second fluid path 722 extends are parallel to the imaginary plane Pv. By extending at least one of the first fluid path 721 and the second fluid path 722 in a direction perpendicular to the Y-axis direction, it is easier to form the at least one of the two within the housing cylindrical portion 41. However, this example does not exclude a configuration in which both the direction in which the first fluid path 721 and the direction in which the second fluid path 722 extends intersect the imaginary plane Pv.

[0097] <1-7. Can 8> Next, refer to Figure 1 、 Figure 3 and Figures 10 to 13 etc., description tank 8. Figure 10 It is a conceptual diagram showing the arrangement of the tank 8 . Figure 11 It is an enlarged cross-sectional view showing a structural example of the tank 8 . Figure 12A It is an enlarged cross-sectional view showing a first modified example of the tank 8 . Figure 12B It is an enlarged cross-sectional view showing a second modified example of the tank 8 . Figure 13 : is an enlarged cross-sectional view showing a modified example of the third outflow port 742. Figure 10 Shown schematically with Figure 3The cross-sectional structure of the driving device 100 is cut along the double-dashed line CC and an imaginary plane perpendicular to the Y-axis direction. Figure 10 In the figure, the gear portion 3 and the like are omitted for ease of observation. Figure 11 Enlarged view Figure 1 Part A is surrounded by the dotted line. FIG. 12A to FIG. 13 Corresponding to Figure 1 Part A is surrounded by the dotted line.

[0098] As described above, the fourth flow path 74 has a tank 8. The tank 8 is connected to the other end of the third flow path 73 through the third inlet 741, and is connected to one end of the fifth flow path 75 through the third outlet 742. The flow path cross-sectional area of the tank 8 is wider than the flow path cross-sectional area of the third inlet 741. In the tank 8, the fluid F flows in the +Y direction. The "flow path cross-sectional area" is the cross-sectional area of the internal space of the tank 8 when the tank 8 is cut with an imaginary plane perpendicular to the direction of flow of the fluid F. In this way, since the volume of the internal space of the tank 8 can be ensured to be large, the fluid F flowing from the third flow path 73 into the fourth flow path 74 can be accumulated in the tank 8. Therefore, by configuring the tank 8, the fluid F can be smoothly supplied from the fourth flow path 74 to the fifth flow path 75 without interruption.

[0099] The tank 8 includes a cylindrical first tank member 81 and a cylindrical second tank member 82. The first tank member 81 extends in the +Y direction from the +Y direction side of the partition wall 42. The second tank member 82 extends in the -Y direction from the -Y direction side of the gear side cover portion 43 and is connected to the +Y direction side end of the first tank member 81. In other words, the partition wall 42 includes the first tank member 81, and the gear side cover portion 43 includes the second tank member 82. In this way, the tank 8 can be formed by the first tank member 81 on the partition wall 42 side and the second tank member 82 on the gear side cover portion 43 side.

[0100] In this embodiment, the tank 8 further includes a sealing member 83. The end of the first tank member 81 on the +Y direction side is connected to the end of the second tank member 82 on the -Y direction side via the sealing member 83. The sealing member 83 can be, for example, an annular gasket disposed between the two. For example, Figure 11 As shown, the tank 8 can be formed by fixing the gear-side cover portion 43 to the partition wall 42 with the sealing member 83 interposed therebetween. In this manner, the connection between the end portion on the +Y direction side of the first tank member 81 and the end portion on the -Y direction side of the second tank member 82 can be sealed by the sealing member 83. Therefore, leakage of the fluid F at the connection portion between the two can be more reliably prevented.

[0101] In addition, the structure of the tank 8 is not limited to the example of this embodiment. Figure 12A and Figure 12BAs shown, one of the end portion on the +Y direction side of the first tank member 81 and the end portion on the −Y direction side of the second tank member 82 may be fitted with the other.

[0102] For example, in Figure 12A In the embodiment, the outer diameter of the end portion of the first tank member 81 on the +Y direction side and the inner diameter of the end portion of the second tank member 82 on the -Y direction side as viewed from the Y axis are the same to such an extent that a fitting structure can be formed between the two. Figure 12A In the embodiment, the end portion of the first tank member 81 on the +Y direction side is fitted into the end portion of the second tank member 82 on the −Y direction side.

[0103] In addition, Figure 12B In the embodiment, the inner diameter of the end portion on the +Y direction side of the first tank member 81 and the outer diameter of the end portion on the -Y direction side of the second tank member 82 as viewed in the Y-axis direction are the same to such an extent that a fitting structure can be formed between the two. Figure 12B In the embodiment, the end portion of the second tank member 82 on the −Y direction side is fitted into the end portion of the first tank member 81 on the +Y direction side.

[0104] In this way, the tank 8 can be formed by fitting the end portion of the first tank member 81 on the +Y direction side and the end portion of the second tank member 82 on the -Y direction side. Figure 11 The structure of the two butt-jointed parts is less susceptible to the influence of the dimensional tolerances of the two. Therefore, the tank 8 can be easily constructed. In addition, for example, even if the sealing member 83 is not used, leakage of the fluid F at the joint portion between the two can be prevented.

[0105] In addition, the tank 8 has a third outflow port 742 and a bottom surface 84. The X-axis direction is a direction perpendicular to the Y-axis direction and the Z-axis direction (vertical direction). The third outflow port 742 is arranged on the -Z direction side (vertically downward side) and the -X direction side of the tank 8 as viewed from the Y-axis direction, and is connected to the fifth flow path 75. Preferably, the bottom surface 84 extends along the -Z direction (vertically downward) as it moves toward the -X direction. In addition, the inclination of the bottom surface 84 is set according to the inclination of the drive device 100 caused when the vehicle 300 equipped with the drive device 100 turns to the left or right, for example. In this way, even if the drive device 100 tilts, such as when the vehicle 300 equipped with the drive device 100 turns right or left, the fluid F can be concentrated on the -X direction side of the tank 8 where the third outflow port 742 is arranged. Therefore, the fluid F in the tank 8 can be supplied to the fifth flow path 75 without interruption. Therefore, even if the drive device 100 tilts, the fluid F can be stably supplied to the second shaft 310. However, this example does not exclude a configuration in which the bottom surface 84 extends in the -X direction rather than in the -Z direction (vertically downward). For example, the bottom surface 84 may be parallel to the X-axis when viewed axially, or it may extend in the +Z direction (vertically upward) as it extends in the -X direction. In the latter case, the fluid F is appropriately stored in the tank 8.

[0106] The third outlet 742 is the other end of the fourth flow path 74. Figure 11 As shown in FIG. 1 and FIG. 2 , the third outflow port 742 is disposed at the end portion on the +Y direction side of the tank 8 .

[0107] However, the arrangement of the third outlet 742 is not limited to Figure 11 For example, Figure 13 As shown, the third outflow port 742 may be arranged away from the end portion on the +Y direction side of the tank 8 in the −Y direction. In this way, the fluid F can be supplied to the fifth flow path 75 while being appropriately accumulated in the tank 8 .

[0108] In addition, as in this embodiment, it is preferable that the tank 8 further has an inclined surface 85. The inclined surface 85 is arranged opposite to the third inlet 741 and extends in the +Y direction as it goes toward the -Z direction (vertically downward) (for example, see Figure 10 Thus, the fluid F that flows into the tank 8 from the third inlet 741 and contacts the inclined surface 85 can be easily guided in the −Z direction (vertically downward).

[0109] At this time, the inner surface of one end of the fifth flow path 75 is connected to the inclined surface 85. The direction in which the one end of the fifth flow path 75 extends is parallel to the inclined surface 85. In this way, the fluid F flowing along the inclined surface 85 can flow smoothly to the one end of the fifth flow path 75.

[0110] However, the example of this embodiment does not exclude a configuration in which the tank 8 does not have the inclined surface 85. Alternatively, even if the tank 8 has the inclined surface 85, the example of this embodiment does not exclude a configuration in which the inner surface of one end portion of the fifth flow path 75 is not directly connected to the inclined surface 85, or a configuration in which the direction in which the one end portion of the fifth flow path 75 extends is not parallel to the inclined surface 85.

[0111] <2. Other> 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.

[0112] The present invention can be used in an apparatus for supplying fluid in a housing to a motor portion.

Claims

1. A driving device, characterized in that: include: a motor unit including a rotor and a stator, the rotor including a first shaft rotatable about an axially extending rotation axis, the stator being arranged radially outside the rotor; a gear portion, the gear portion being mounted on one axial side of the first shaft; a housing for housing the motor unit and the gear unit; and A fluid flow path capable of allowing fluid to flow, The housing has: A housing cylindrical portion extending in the axial direction and accommodating the motor portion; a partition wall closing one axial end portion of the housing cylindrical portion; and a gear side cover portion, the gear side cover portion being arranged at one axial end portion of the partition wall and constituting a gear storage portion for storing the gear portion together with the partition wall; The fluid flow path includes a first flow path, a third flow path, a fourth flow path and a sixth flow path, One end of the first flow path is connected to the gear housing portion. The third flow path is arranged inside the partition wall and extends in a direction intersecting the rotation axis. One end of the third flow path is connected to the gear housing portion via the first flow path. The fourth flow path is connected to the other end of the third flow path and extends toward the gear side cover. One end of the sixth flow path is connected to the other end of the third flow path, The other end portion of the sixth flow path is disposed within the housing cylindrical portion.

2. The driving device according to claim 1, characterized in that A pump is provided in the fluid flow path. The gear portion includes a differential device rotatable about a differential axis extending in the axial direction. The pump is arranged between the rotation axis and the differential axis in a first direction perpendicular to the axial direction and the up-down direction.

3. The driving device according to claim 2, characterized in that A cooler is provided in the fluid flow path. The fluid flow path includes a second flow path connecting the pump and one end portion of the third flow path via the cooler.

4. The driving device according to claim 3, characterized in that The gear unit has an output shaft mounted on the differential device. The cooler, the pump, and the output shaft are arranged in the first direction when viewed from the top and bottom.

5. The driving device according to any one of claims 1 to 4, characterized in that A pump and a cooler are provided in the fluid flow path. The sixth flow path has a fluid supply portion extending in the axial direction, The fluid supply portion is provided between the pump and the cooler in a first direction perpendicular to the axial direction and the up-down direction.

6. The driving device according to any one of claims 1 to 4, characterized in that A pump and a cooler are provided in the fluid flow path. The pump and the cooler are respectively arranged on the radially outer side surface of the casing cylindrical portion and are arranged in the circumferential direction.

7. The driving device according to any one of claims 1 to 4, characterized in that A pump and a cooler are provided in the fluid flow path. The first inlet of the pump is arranged on one axial side of the pump. The first outlet of the pump is arranged on the other axial side of the pump. The second inlet of the cooler is arranged on the other axial side of the cooler and is connected to the first outlet. The second outlet of the cooler is arranged on one axial side of the cooler and is connected to the third flow path.

8. The driving device according to claim 7, characterized in that The cooler is arranged on one side of the pump in the circumferential direction. The second inlet is arranged on the other axial side and the other circumferential side of the cooler. The second outflow port is arranged on one axial side and one circumferential side of the cooler.

9. The driving device according to any one of claims 1 to 4, characterized in that The gear portion includes a second shaft connected to one axial end portion of the first shaft. The fluid flow path further includes a fifth flow path disposed inside the gear side cover portion. The other end of the fifth flow path is connected to one axial end portion of the second shaft.

10. The driving device according to any one of claims 1 to 4, characterized in that The housing further includes a bearing holding portion for rotatably holding the first shaft via a bearing. The sixth flow path includes at least one providing portion that opens toward at least one of the stator and the bearing.

11. The driving device according to any one of claims 1 to 4, characterized in that The fourth flow path has a third inlet and a tank, The tank is connected to the other end of the third flow path through the third inlet. The tank is provided on one side of the rotation axis in a first direction perpendicular to the axial direction and the up-down direction.

12. The driving device according to claim 11, characterized in that The fourth flow path also has a third flow outlet, The third outflow port is arranged at one axial end portion of the tank.

13. The driving device according to claim 11, characterized in that The tank comprises: a cylindrical first tank member extending from one axial side of the partition wall to one axial direction; and The second tank member is cylindrical and extends from the other axial side of the gear-side cover portion to the other axial direction, and is connected to one axial end portion of the first tank member.

14. The driving device according to any one of claims 1 to 4, characterized in that The fluid flow path further includes a seventh flow path, One end of the seventh flow path is connected to the other axial end of the sixth flow path. The other end of the seventh flow path is connected to the other axial end of the first shaft.

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