Drive device

Abstract

The drive device includes: a motor including a rotor rotatable about a central axis and a stator facing the rotor with a gap therebetween; the gear mechanism is connected with the rotor; a housing having a motor housing in which the motor is housed, a gear housing in which the gear mechanism is housed, and a reservoir in which a fluid is stored; and a pump that is attached to the housing and conveys the fluid in the reservoir to the inside of the motor housing. The shell is provided with a mounting part, and the mounting part is provided with a mounting hole. The mounting hole has an opening that opens upward on the outer surface of the housing. At least a portion of the pump is inserted into the mounting hole from the opening.

Description

Technical Field

[0001] The invention relates to a drive device.

[0002] This application claims priority based on Japanese Patent Application No. 2022-209837 filed in Japan on December 27, 2022, the contents of which are cited here. Background Art

[0003] Conventionally, there is known a power transmission device having a pump structure for supplying oil to a motor (for example, Patent Document 1). In this structure, the motor can be directly cooled by the oil.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-91001 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The power transmission device as described above has a pump for delivering oil. Regarding the pump, it is assumed that the pump is removed for filter replacement or the like, but in this case, it may be difficult to perform maintenance of the pump depending on the arrangement of the pump or the like.

[0009] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a drive device having a structure that allows easy maintenance of a pump.

[0010] Means for solving problems

[0011] A driving device according to one embodiment of the present invention comprises: a motor having a rotor capable of rotating about a central axis and a stator opposed to the rotor with a gap therebetween; a gear mechanism connected to the rotor; a housing having a motor housing for accommodating the motor, a gear housing for accommodating the gear mechanism, and a storage portion for storing a fluid therein; and a pump mounted on the housing to transport the fluid in the storage portion to the inside of the motor housing. The housing has a mounting portion having a mounting hole. The mounting hole has an opening portion that opens upward on the outer surface of the housing. At least a portion of the pump is inserted into the mounting hole from the opening portion.

[0012] Effects of the Invention

[0013] According to one aspect of the present invention, in the driving device, maintenance of the pump can be easily performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing the driving device in the first embodiment.

[0015] Figure 2 It is a cross-sectional view schematically showing the driving device in the first embodiment.

[0016] Figure 3 This is a diagram of the drive device in the first embodiment as viewed from one axial side.

[0017] Figure 4 This is a diagram showing the driving device in the first embodiment as viewed from above.

[0018] Figure 5 This is a partial cross-sectional view showing a part of the driving device in the first embodiment.

[0019] Figure 6 This is a diagram of the drive device in the second embodiment as viewed from one axial side. DETAILED DESCRIPTION

[0020] In the accompanying drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the up-down direction. The +Z side is the upper side, and the -Z side is the lower side. The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of a vehicle equipped with a drive device. In the following embodiments, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-to-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle.

[0021] In addition, the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. In addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "vertical direction" also includes a substantially vertical direction.

[0022] The center axis J1 shown appropriately in the figure is an imaginary axis extending in a direction intersecting the up-down direction. More specifically, the center axis J1 extends in a Y-axis direction perpendicular to the up-down direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the center axis J1 is referred to as the "axial direction", the radial direction centered on the center axis J1 is referred to as the "radial direction", and the circumferential direction centered on the center axis J1, that is, the direction around the center axis J1, is referred to as the "circumferential direction".

[0023] In the following description, the left side in the axial direction (+Y side) is referred to as "one side in the axial direction", and the right side in the axial direction (-Y side) is referred to as "the other side in the axial direction". The up and down direction is, for example, the vertical direction, and the front and back directions and the left and right directions are, for example, horizontal directions perpendicular to the vertical direction. In addition, in the following embodiments, the front and back directions (X-axis direction) are equivalent to the "prescribed direction" perpendicular to the axial direction. In the following embodiments, the rear side (-X side) is one side of the prescribed direction, and the front side (+X side) is the other side of the prescribed direction.

[0024] <First embodiment>

[0025] Figures 1 to 4 The drive device 100 of the present embodiment shown in FIG. 1 is a drive device mounted on a vehicle and rotates the axle DS. The vehicle equipped with the drive device 100 is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). Figure 2 As shown, the driving device 100 includes a motor 10 , a gear mechanism 20 , and a housing 30 . The housing 30 includes a motor housing 31 that accommodates the motor 10 therein and a gear housing 32 that accommodates the gear mechanism 20 therein.

[0026] The motor 10 has a rotor 40 that can rotate around a central axis J1 and a stator 50 that is opposed to the rotor 40 with a gap therebetween. The rotor 40 has a motor shaft 41 that is arranged along the central axis J1 and a rotor core 42 that is fixed to the motor shaft 41. In the present embodiment, the motor shaft 41 is a hollow shaft that extends axially around the central axis J1 and is open on both sides of the axial direction. The motor shaft 41 is supported by a pair of bearings 43a and 43b so as to be rotatable around the central axis J1. The pair of bearings 43a and 43b are, for example, ball bearings. A hole portion 41a is provided in the motor shaft 41, and the hole portion 41a connects the inside of the motor shaft 41 and the outside of the motor shaft 41. A plurality of hole portions 41a are provided at intervals in the circumferential direction. Although not shown in the figure, a magnet is retained on the rotor core 42.

[0027] The stator 50 is radially opposed to the rotor 40 with a gap therebetween. In the present embodiment, the stator 50 is located radially outside the rotor 40. The stator 50 is in a ring shape surrounding the rotor 40. The stator 50 includes a stator core 51 and a coil assembly 54. The stator core 51 is located radially outside the rotor core 42 and is arranged to be opposed to the rotor core 42 with a gap therebetween. The stator core 51 is formed by stacking a plurality of plate members such as electromagnetic steel plates in the axial direction, for example.

[0028] The coil assembly 54 has a plurality of coils 54c mounted on the stator core 51. Although not shown in the figure, the coil assembly 54 may have a binding member for binding the coils 54c, or may have a jumper connecting the coils 54c to each other. The coil assembly 54 has coil ends 54a and 54b protruding from the stator core 51 in the axial direction.

[0029] The gear mechanism 20 is connected to the rotor 40. More specifically, the gear mechanism 20 is connected to the end of one axial side (+Y side) of the motor shaft 41. The gear mechanism 20 transmits the rotation of the rotor 40 to the axle DS of the vehicle. The gear mechanism 20 includes a reduction gear 21 connected to the rotor 40 and a differential device 22 connected to the reduction gear 21.

[0030] The reduction gear 21 includes a first gear shaft 23a, a second gear shaft 23b, a first gear 24a, a second gear 24b and a third gear 24c. The first gear shaft 23a extends in the axial direction. In the present embodiment, the first gear shaft 23a is a hollow shaft centered on the central axis J1 and open on both sides in the axial direction. The first gear shaft 23a is supported by a pair of bearings 25a and 25b so as to be rotatable around the central axis J1. The pair of bearings 25a and 25b are, for example, ball bearings. The end of the other axial side (-Y side) of the first gear shaft 23a is connected to the end of the one axial side (+Y side) of the motor shaft 41.

[0031] The second gear shaft 23b is rotatable about the intermediate axis J2. In the present embodiment, the intermediate axis J2 is a virtual axis extending parallel to the central axis J1. Figure 3 As shown in FIG. 1 , the intermediate axis J2 is located below the central axis J1 and is located on the rear side (-X side) of the central axis J1. Figure 2 As shown, the first gear 24a is provided on the outer peripheral surface of the first gear shaft 23a. The second gear 24b and the third gear 24c are provided on the outer peripheral surface of the second gear shaft 23b. The second gear 24b meshes with the first gear 24a. In the present embodiment, the second gear 24b is a gear at least partly located in a storage portion 39 described later. In the present embodiment, the lower end of the second gear 24b is located in the storage portion 39 and is immersed in the oil O stored in the storage portion 39. The oil O is lifted up by the rotation of the second gear 24b. The lifted oil O is provided to the reduction gear 21 and the differential device 22 as lubricating oil, for example. The third gear 24c is located at a position closer to the other axial side (-Y side) than the first gear 24a and the second gear 24b.

[0032] The differential device 22 has a differential case 22a and a ring gear 22b. The differential case 22a and the ring gear 22b are rotatable around the output axis J3. That is, in the present embodiment, the differential device 22 has the ring gear 22b as a gear rotatable around the output axis J3. In the present embodiment, the output axis J3 is an imaginary axis extending parallel to the center axis J1. Figure 3 As shown, the output axis J3 is located at a position lower than the center axis J1 and at a position higher than the intermediate axis J2. The output axis J3 is located at a position rearward (-X side) than the center axis J1 and the intermediate axis J2. The vehicle axle DS is connected to the differential case 22a. The ring gear 22b is provided on the differential case 22a. The ring gear 22b meshes with the third gear 24c.

[0033] like Figure 2 As shown, in the housing 30 of the present embodiment, the motor housing 31 and the gear housing 32 are arranged in the axial direction. A part of the motor housing 31 overlaps with the gear housing 32 in the axial direction. The gear housing 32 is located on one axial side (+Y side) of the motor housing 31. The gear housing 32 is connected to one axial side of the motor housing 31. The motor housing 31 protrudes upward from the gear housing 32. The portion of the motor housing 31 located above the gear housing 32 is the housing protrusion 31d.

[0034] like Figure 1 As shown, the gear housing 32 protrudes to the rear side (-X side) than the motor housing 31. The portion of the gear housing 32 that protrudes to the rear side than the motor housing 31 is a first protrusion 32e that protrudes to one side (-X side) than the motor housing 31 in the front-to-back direction (X-axis direction) perpendicular to the axial direction. That is, the gear housing 32 has the first protrusion 32e. The gear housing 32 protrudes downward than the motor housing 31.

[0035] like Figure 2 As shown, in this embodiment, the motor housing 31 has a cylindrical first peripheral wall portion 31c opened on the other axial side (-Y side) and a motor cover 31b that closes the opening on the other axial side of the first peripheral wall portion 31c. A bearing retaining portion 34b that retains the bearing 43b is provided on the surface of the motor cover 31b on one axial side (+Y side). The bearing retaining portion 34b is in a substantially annular shape that surrounds the bearing 43b with the central axis J1 as the center.

[0036] In the present embodiment, the gear housing 32 includes a cylindrical second peripheral wall portion 32c opened on one axial side (+Y side) and a gear cover 32b that closes the opening on one axial side of the second peripheral wall portion 32c. A bearing retaining portion 35a that retains the bearing 25a is provided on the surface of the gear cover 32b on the other axial side (-Y side). The bearing retaining portion 35a is in a substantially annular shape that surrounds the bearing 25a with the central axis J1 as the center.

[0037] The housing 30 has a partition wall portion 33 that divides the interior of the motor housing 31 and the interior of the gear housing 32. The partition wall portion 33 is a wall portion that axially separates the interior of the motor housing 31 from the interior of the gear housing 32. The partition wall portion 33 has a partition wall opening 33a that connects the interior of the motor housing 31 and the interior of the gear housing 32. In the present embodiment, the partition wall opening 33a penetrates the lower end of the partition wall portion 33 in the axial direction.

[0038] A bearing holding portion 34a for holding the bearing 43a is provided on a portion of the partition wall portion 33 that constitutes a portion of the inner surface of the motor housing 31, that is, on the surface of the partition wall portion 33 on the other axial side (-Y side). A bearing holding portion 35b for holding the bearing 25b is provided on a portion of the partition wall portion 33 that constitutes a portion of the inner surface of the gear housing 32, that is, on the surface of the partition wall portion 33 on the one axial side (+Y side). Each of the bearing holding portions 34a, 35b is in a substantially annular shape surrounding each of the bearings 43a, 25b. The interior of the bearing holding portion 34a and the interior of the bearing holding portion 35b are connected to each other in the axial direction, forming a hole that penetrates the partition wall portion 33 in the axial direction.

[0039] In the present embodiment, the housing 30 has a storage portion 39 in which oil O as a fluid is stored. The oil O is used as a refrigerant for cooling the motor 10. In addition, the oil O is used as a lubricating oil in the reduction gear 21 and the differential gear 22. As the oil O, for example, in order to exert the functions of a refrigerant and a lubricating oil, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) having a relatively low viscosity.

[0040] At least a portion of the storage portion 39 is provided in the gear housing 32. In the present embodiment, the entire storage portion 39 is provided in the gear housing 32. The storage portion 39 is provided in the lower portion of the gear housing 32. The storage portion 39 is composed of a bottom wall portion 32a located at the lower side among the wall portions constituting the gear housing 32 and a plurality of wall portions protruding upward from the bottom wall portion 32a. In the present embodiment, the bottom wall portion 32a is located at a lower side than the bottom wall portion 31a located at the lower side among the wall portions constituting the motor housing 31.

[0041] In this embodiment, the motor unit 90 is composed of the motor 10 and the motor housing 31. That is, the motor unit 90 includes the motor 10 and the motor housing 31. Figure 3 As shown, the motor unit 90 has a second protrusion 91 that protrudes radially outward from the gear housing 32 when viewed in the axial direction. In the present embodiment, the second protrusion 91 is formed by the housing protrusion 31d of the motor housing 31. In the present embodiment, the second protrusion 91 protrudes upward from the gear housing 32 when viewed in the axial direction.

[0042] like Figure 1 and Figure 4 As shown, the housing 30 has a mounting portion 36. In the present embodiment, the mounting portion 36 is located at the first protrusion 32e. In addition, "the mounting portion 36 is located at the first protrusion 32e" means that at least a portion of the mounting portion 36 is in contact with the first protrusion 32e, or is connected to the first protrusion 32e. The mounting portion 36 protrudes to the other axial side (-Y side) than the first protrusion 32e. In the present embodiment, the mounting portion 36 is connected to the first protrusion 32e, and protrudes to the other axial side from the surface on the other axial side of the first protrusion 32e. In the present embodiment, the mounting portion 36 is arranged on the upper side portion of the housing 30. In more detail, the mounting portion 36 is arranged on the upper side portion of the first protrusion 32e. The mounting portion 36 is arranged on the rear side portion of the housing 30.

[0043] The mounting portion 36 is located on the rear side (-X side) of the motor housing 31. In the present embodiment, the mounting portion 36 is connected to the motor housing 31. That is, in the present embodiment, the mounting portion 36 is connected to the motor housing 31 over the first protrusion 32e of the gear housing 32. The mounting portion 36 is connected to the rear surface of the motor housing 31. At least a portion of the mounting portion 36 overlaps with the motor housing 31 in the front-to-back direction (X-axis direction). In the present embodiment, the entire mounting portion 36 overlaps with the motor housing 31 in the front-to-back direction.

[0044] In addition, in this specification, "a certain object overlaps with other objects in a certain direction" means that a certain object is arranged at a position overlapping with other objects when viewed along a certain direction. In this embodiment, when viewed along the front-back direction (X-axis direction), the entire mounting portion 36 is arranged at a position overlapping with the motor housing 31.

[0045] The upper surface 36f of the mounting portion 36 is connected to the upper surface 32f of the gear housing 32. In more detail, the upper surface 36f of the mounting portion 36 is arranged at the same position as the upper surface 32f in the up-down direction in the portion of the gear housing 32 connected to the mounting portion 36, and is connected to the other axial side (-Y side) of the upper surface 32f. The mounting portion 36 extends downward from the upper surface 32f of the gear housing 32. The upper surface 36f of the mounting portion 36 is located at a position lower than the upper end of the motor housing 31. As shown in FIG. Figure 1 As shown in FIG. 1 , the lower surface 36g of the mounting portion 36 is located above the output axis J3. In the present embodiment, the mounting portion 36 is arranged at a position overlapping the output axis J3 when viewed in the up-down direction.

[0046] The mounting portion 36 has a mounting hole 36a that is recessed downward from an upper surface 36f of the mounting portion 36. In the present embodiment, the mounting hole 36a is a circular hole centered on a pump axis J4 described later when viewed in the vertical direction. Figure 5 As shown, the mounting hole 36a has an opening portion 36b that opens toward the upper side on the outer surface of the housing 30. The mounting hole 36a is a hole having a bottom 36e on the lower side. The upper surface of the bottom 36e is a bottom surface 36c facing the upper side of the inner surface of the mounting hole 36a. The inner surface of the mounting hole 36a has a peripheral wall surface 36d that surrounds the pump 71 described later. In the present embodiment, the peripheral wall surface 36d is a cylindrical surface centered on the pump axis J4 described later. The lower end of the peripheral wall surface 36d is connected to the outer edge of the bottom surface 36c.

[0047] In addition, in this specification, "the mounting hole opens toward the upper side" includes not only the case where the mounting hole opens toward the upper side, but also the case where the mounting hole opens in a direction obliquely inclined to a direction perpendicular to the up-down direction relative to the upper side. In this embodiment, the mounting hole 36a opens toward the upper side. In addition, the mounting hole 36a may open in a direction obliquely inclined to at least one of the front-rear direction and the axial direction relative to the upper side.

[0048] The drive device 100 has a pump 71 that delivers the oil O in the storage portion 39 to the inside of the motor housing 31. In the present embodiment, the pump 71 is an electric pump. The pump 71 is mounted on the housing 30 in a detachable manner. At least a portion of the pump 71 is inserted into the mounting hole 36a from the opening portion 36b. In the present embodiment, the opening portion 36b of the mounting hole 36a for the pump 71 to be inserted is open on the outer surface of the housing 30, so the pump 71 can be removed from the outside of the housing 30. As a result, it is easier to remove the pump 71 from the housing 30 than when the pump 71 is accommodated inside the housing 30. In addition, the opening portion 36b opens toward the upper side, so even if the pump 71 is pulled out from the mounting hole 36a to the upper side and removed from the housing 30, it is possible to suppress the oil O from leaking from the mounting hole 36a to the outside. As a result, it is not necessary to discharge the oil O in the housing 30 before removing the pump 71 from the housing 30, and the pump 71 can be removed from the housing 30 more easily. This makes it easy to attach and detach the pump 71 to and from the housing 30, and makes it easy to maintain the pump 71. Furthermore, when the pump 71 is to be replaced, the replacement work of the pump 71 can also be easily performed.

[0049] As described above, in the present embodiment, the mounting portion 36 having the mounting hole 36a is located at the first protrusion 32e, and at least a portion of the mounting portion 36 overlaps with the motor housing 31 in the front-rear direction (X-axis direction). Therefore, the mounting portion 36 for mounting the pump 71 can be arranged on the step portion formed by the motor housing 31 and the gear housing 32. Thus, it is possible to suppress the mounting portion 36 and the pump 71 from protruding in the drive device 100, and the drive device 100 can be miniaturized. In addition, it is possible to suppress the mounting portion 36 and the pump 71 from contacting other components at the place where the drive device 100 is arranged, and the drive device 100 can be easily arranged regardless of the positions of the mounting portion 36 and the pump 71. Therefore, it is possible to suppress the position where the drive device 100 is arranged from being restricted.

[0050] In addition, as described above, in the present embodiment, the upper surface 36f of the mounting portion 36 is connected to the upper surface 32f of the gear housing 32, and the mounting portion 36 extends downward from the upper surface 32f of the gear housing 32. Therefore, it is possible to prevent the mounting portion 36 from protruding upward beyond the first protrusion 32e. Thus, it is possible to prevent the housing 30 from becoming larger in the vertical direction. In addition, by providing the opening portion 36b of the mounting hole 36a on the upper surface 36f of the mounting portion 36, it is possible to prevent the pump 71 from contacting the gear housing 32 when the pump 71 is inserted from the opening portion 36b into the mounting hole 36a. Therefore, it is easy to insert the pump 71 into the mounting hole 36a.

[0051] In addition, as described above, in the present embodiment, the mounting portion 36 is connected to the motor housing 31. Therefore, it is possible to improve the strength of the mounting portion 36. In particular, when the mounting portion 36 is connected across the motor housing 31 and the gear housing 32 as in the present embodiment, it is possible to more appropriately improve the strength of the mounting portion 36. Thus, the pump 71 can be stably mounted on the housing 30.

[0052] In addition, as described above, in the present embodiment, the lower surface 36g of the mounting portion 36 is located above the output axis J3. Therefore, it is possible to suppress the wiring (not shown) extending from the pump 71 from contacting the axle DS arranged along the output axis J3. Thus, it is possible to easily handle the wiring (not shown) extending from the pump 71, and to easily perform connection work on the wiring.

[0053] In the present embodiment, a portion of the pump 71 is inserted into the mounting hole 36a. More specifically, the entire pump 71 except for the upper end is inserted into the mounting hole 36a. The pump 71 has a pump housing 73, a pump motor 74, and a pump mechanism 75. The pump housing 73 has a pump housing body 73a, a pump fixing portion 73b, a suction port 73c, and a discharge port 73d. In the present embodiment, the pump body 71a is composed of the portion of the pump 71 except for the suction port 73c. ​​That is, the pump 71 has a pump body 71a and a suction port 73c.

[0054] The pump housing body 73a accommodates the pump motor 74 and the pump mechanism 75 inside. In the present embodiment, the pump housing body 73a is cylindrical with the pump axis J4 as the center. In the present embodiment, the pump axis J4 is an imaginary axis extending in the up-down direction. The pump axis J4 extends in a direction perpendicular to the axial direction. In addition, in the following description, the radial direction with the pump axis J4 as the center is sometimes referred to as the "pump radial direction".

[0055] The upper end of the pump housing body 73a protrudes upward from the mounting hole 36a. The lower end of the pump housing body 73a is located above the bottom surface 36c and is disposed opposite to the bottom surface 36c in the vertical direction with a gap therebetween. A pump chamber 75c is provided inside the lower portion of the pump housing body 73a to accommodate the pump mechanism 75.

[0056] The outer peripheral surface of the pump housing main body 73a and the peripheral wall surface 36d of the mounting hole 36a are arranged opposite to each other with a gap in the pump radial direction. The outer peripheral surface of the pump housing main body 73a and the peripheral wall surface 36d of the mounting hole 36a are sealed by the second sealing portion 77b in the pump radial direction. In the present embodiment, the second sealing portion 77b is an annular O-ring surrounding the pump 71 around the pump axis J4. The second sealing portion 77b is embedded in a groove, which is provided on the outer peripheral surface of the upper end of the portion of the pump housing main body 73a inserted into the mounting hole 36a. The inner edge of the second sealing portion 77b contacts the pump housing main body 73a. The outer edge of the second sealing portion 77b contacts the peripheral wall surface 36d in the opening 36b.

[0057] The pump fixing portion 73b protrudes radially outward from a portion of the pump housing main body 73a that protrudes upward from the mounting hole 36a, centered on the pump axis J4. The pump fixing portion 73b contacts the upper surface 36f of the mounting portion 36. The pump fixing portion 73b is fixed to the mounting portion 36 by bolts or the like. Thus, the pump 71 is fixed to the housing 30 in a manner that allows for loading and unloading. In the present embodiment, a plurality of pump fixing portions 73b are provided at intervals around the pump axis J4.

[0058] The suction port portion 73c protrudes downward from the pump body 71a. In the present embodiment, the suction port portion 73c protrudes downward from the pump housing body portion 73a. The suction port portion 73c is substantially cylindrical and opens downward. In the present embodiment, the suction port portion 73c is staggered in the pump radial direction relative to the pump axis J4. The suction port portion 73c is inserted into the suction flow path portion 61g described later.

[0059] The first sealing portion 77a is installed on the outer peripheral surface of the suction port portion 73c. ​​In the present embodiment, the first sealing portion 77a is an annular O-ring surrounding the suction port portion 73c. ​​The first sealing portion 77a is embedded in a groove provided on the outer peripheral surface of the suction port portion 73c. ​​The first sealing portion 77a contacts the outer peripheral surface of the suction port portion 73c and the inner surface of the suction flow path portion 61g, and seals between the outer peripheral surface of the suction port portion 73c and the inner surface of the suction flow path portion 61g. In this way, in the present embodiment, the suction port portion 73c is inserted into the suction flow path portion 61g via the first sealing portion 77a. The inside of the suction flow path portion 61g and the inside of the mounting hole 36a are sealed by the first sealing portion 77a.

[0060] In the present embodiment, the discharge port 73d is provided in a portion of the pump housing 73 located below the pump chamber 75c. The discharge port 73d extends downward from the pump chamber 75c and opens downward to be connected to the inside of the mounting hole 36a. Thus, the discharge port 73d connects the inside of the pump chamber 75c and the inside of the mounting hole 36a.

[0061] The pump motor 74 includes a pump rotor 74a that can rotate around a pump axis J4 and a pump stator 74b located outside the pump rotor 74a in the pump radial direction. The pump rotor 74a includes a pump shaft 74c that extends axially along the pump axis J4 and a pump rotor core 74d fixed to the outer peripheral surface of the pump shaft 74c. The lower end of the pump shaft 74c is located in the pump chamber 75c.

[0062] The pump mechanism 75 is housed in the pump chamber 75c. The pump mechanism 75 is connected to the lower end of the pump rotor 74a. The pump mechanism 75 has an inner rotor 75a connected to the lower end of the pump shaft 74c and an annular outer rotor 75b surrounding the inner rotor 75a. Although not shown in the figure, the inner rotor 75a and the outer rotor 75b have teeth that mesh with each other. The inner rotor 75a rotates around the pump axis J4 by the pump rotor 74a rotating around the pump axis J4. The outer rotor 75b also rotates by the rotation of the inner rotor 75a. In this way, the pump mechanism 75 is driven by the pump motor 74, and the oil O is sucked into the pump chamber 75c from the suction port 73c, and the oil O sucked into the pump chamber 75c is discharged from the discharge port 73d into the mounting hole 36a. Thus, the oil O flows in the flow path 60 described later through the pump 71.

[0063] like Figure 1As shown, the drive device 100 has a cooler 72 for cooling the oil O delivered by the pump 71. The cooler 72 is, for example, in the shape of a roughly rectangular parallelepiped that is longer in the front-to-back direction (X-axis direction). In the present embodiment, the cooler 72 is an oil cooler that cools the oil O by exchanging heat with a refrigerant that flows in a flow path (not shown) provided in the cooler 72. The refrigerant is, for example, water. The cooler 72 is, for example, a stacked oil cooler having a plurality of plates stacked at intervals inside, and flow paths for the oil O to flow and flow paths for the water as a refrigerant to flow alternately provided between the plates. In the present embodiment, the plurality of plates provided in the cooler 72 are, for example, stacked in the up-down direction.

[0064] The cooler 72 is located on the upper side of the gear housing 32. That is, at least a portion of the cooler 72 overlaps with the gear housing 32 in the up-down direction (Z-axis direction) perpendicular to the axial direction. In the present embodiment, the entire cooler 72 overlaps with the gear housing 32 in the up-down direction. In the present embodiment, the cooler 72 is fixed to the gear housing 32. More specifically, the cooler 72 is fixed to the upper surface 32f of the upper wall portion 32d located on the upper side of the wall portion constituting the gear housing 32. Figure 2 As shown in FIG. 1 , the cooler 72 is fixed to the upper portion of the second peripheral wall portion 32c. Figure 1 As shown, the cooler 72 is located above the front portion of the gear housing 32. The end of the cooler 72 on one axial side (+Y side) is located closer to the other axial side (-Y side) than the end of the gear housing 32 on one axial side.

[0065] The cooler 72 is located on one axial side (+Y side) of the second protrusion 91. That is, at least a portion of the cooler 72 overlaps with the second protrusion 91 in the axial direction. In the present embodiment, the entire cooler 72 overlaps with the second protrusion 91 in the axial direction. Thus, in the present embodiment, at least a portion of the cooler 72 is located on the upper side of the gear housing 32 and overlaps with the second protrusion 91 in the axial direction. Therefore, the cooler 72 can be arranged on the step portion formed by the motor unit 90 and the gear housing 32. Thus, the cooler 72 can be prevented from extending out in the drive device 100, and the drive device 100 can be miniaturized. In addition, the cooler 72 can be prevented from contacting other components in the place where the drive device 100 is arranged, and the drive device 100 can be easily arranged regardless of the position of the cooler 72. Therefore, it is possible to prevent the position where the drive device 100 is arranged from being restricted.

[0066] In the present embodiment, the upper end of the cooler 72 is located below the upper end of the housing protrusion 31d, that is, the upper end of the second protrusion 91. The upper end of the cooler 72 may be located at the same position as the upper end of the housing protrusion 31d in the vertical direction, or may be located above the upper end of the housing protrusion 31d. The cooler 72 is arranged to be separated from the housing protrusion 31d to one side (+Y side) in the axial direction.

[0067] like Figure 2 As shown, the cooler 72 has an inlet 72a for the oil O to flow in and an outlet 72b for the oil O to flow out. In the present embodiment, the inlet 72a and the outlet 72b are arranged on the lower surface of the cooler 72 and open toward the lower side. That is, in the present embodiment, the inlet 72a and the outlet 72b open in the same direction as each other. Therefore, the inlet 72a and the outlet 72b can be opened on the same surface of the cooler 72. Thus, by fixing the surfaces of the inlet 72a and the outlet 72b openings in the cooler 72 to the housing 30, the inlet 72a and the outlet 72b can be connected to the flow path portion of the flow path 60 described later that is arranged in the housing 30. Therefore, the cooler 72 can be easily installed. In addition, the direction in which the inlet 72a opens and the direction in which the outlet 72b opens are not particularly limited, and they can also be in different directions.

[0068] The drive device 100 includes a flow path 60 through which the oil O as a fluid delivered by the pump 71 flows. In the following description, the upstream side in the flow direction of the oil O in the flow path 60 is sometimes referred to as the "upstream side", and the downstream side in the flow direction of the oil O in the flow path 60 is sometimes referred to as the "downstream side". In the present embodiment, the flow path 60 includes a first flow path portion 61 and a second flow path portion 62.

[0069] The first flow path portion 61 includes a first connection flow path portion 61a, a second connection flow path portion 61b, a third connection flow path portion 61c, a fluid supply portion 61d, and a fourth connection flow path portion 61e. The first connection flow path portion 61a connects the interior of the storage portion 39 and the pump 71. In the present embodiment, at least a portion of the first connection flow path portion 61a is disposed at the partition wall portion 33. Therefore, it is easy to transport the oil O in the storage portion 39 upward through the portion of the first connection flow path portion 61a disposed at the partition wall portion 33, and it is easy to transport the oil O to the pump 71 inserted into the mounting hole 36a opened at the upper side. In the present embodiment, the first connection flow path portion 61a is disposed in a manner that straddles the portion of the gear housing 32 that protrudes downward from the motor housing 31 and the partition wall portion 33. In this way, in the present embodiment, the housing 30 includes the first connection flow path portion 61a.

[0070] like Figure 5As shown, the first connecting flow path portion 61a has an intake flow path portion 61g located at the lower side of the mounting hole 36a. The intake flow path portion 61g is provided at the bottom 36e. The end portion on the downstream side of the intake flow path portion 61g is the end portion on the downstream side of the first connecting flow path portion 61a. The end portion on the downstream side of the intake flow path portion 61g opens toward the upper side on the bottom surface 36c and opens in the mounting hole 36a. The intake port portion 73c is inserted into the intake flow path portion 61g from the upper side. Thus, the pump 71 and the first connecting flow path portion 61a can be properly connected. In addition, by inserting the pump 71 into the mounting hole 36a from the upper side, the intake port portion 73c can be easily inserted into the intake flow path portion 61g, and the pump 71 and the first connecting flow path portion 61a can be easily connected.

[0071] like Figure 2 As shown, the second connecting flow path portion 61b connects the interior of the mounting hole 36a and the cooler 72. Figure 5 As shown in FIG. 1 , the second connecting flow path portion 61b opens at the peripheral wall surface 36d surrounding the pump 71 in the inner surface of the mounting hole 36a. Therefore, the oil O discharged from the discharge port 73d of the pump 71 into the mounting hole 36a can be appropriately flowed into the second connecting flow path portion 61b. In the present embodiment, the end portion on the upstream side of the second connecting flow path portion 61b opens at a portion located on one axial side (+Y side) of the peripheral wall surface 36d.

[0072] like Figure 2 As shown, the downstream end of the second connecting flow path portion 61b is connected to the inlet 72a of the cooler 72. The second connecting flow path portion 61b is provided on the wall portion constituting the gear housing 32. That is, in the present embodiment, the housing 30 has the second connecting flow path portion 61b. In the present embodiment, the second connecting flow path portion 61b is provided on the upper wall portion 32d.

[0073] The third connecting flow path 61c connects the cooler 72 and the fluid supply part 61d. The third connecting flow path 61c is connected to the outlet 72b of the cooler 72. The third connecting flow path 61c is provided, for example, across the wall forming the gear housing 32 and the wall forming the motor housing 31.

[0074] In the present embodiment, the fluid supply portion 61d is a tube extending in the axial direction. The fluid supply portion 61d is located inside the motor housing 31. The fluid supply portion 61d is located, for example, on the upper side of the stator 50. The fluid supply portion 61d has a supply port 61f for supplying oil O to the stator 50. That is, the first flow path portion 61 has a supply port 61f. The supply port 61f opens inside the motor housing 31. Thus, the first flow path portion 61 connects the pump 71 and the inside of the motor housing 31. That is, the flow path 60 connects at least between the pump 71 and the inside of the motor housing 31. The supply port 61f opens toward the stator core 51. A plurality of supply ports 61f are provided at intervals along the axial direction.

[0075] like Figure 4 As shown, in the present embodiment, two fluid supply parts 61d are provided. The two fluid supply parts 61d are separately arranged along the front-back direction (X-axis direction). In the present embodiment, the third connecting flow path part 61c is branched into two branches, and is respectively connected to the ends of the other axial side (-Y side) of the two fluid supply parts 61d.

[0076] like Figure 2 As shown, the fourth connecting flow path portion 61e connects the fluid supply portion 61d and the second flow path portion 62. The downstream end of the fourth connecting flow path portion 61e includes the interior of the bearing holding portion 34b. The downstream end of the fourth connecting flow path portion 61e is the downstream end of the first flow path portion 61. The fourth connecting flow path portion 61e is provided, for example, at the motor cover 31b.

[0077] The second flow path portion 62 includes a motor shaft inner flow path portion 62a, a gear shaft inner flow path portion 62b, and a rotor core inner flow path portion 62c. The motor shaft inner flow path portion 62a is disposed inside the motor shaft 41. The motor shaft inner flow path portion 62a and the gear shaft inner flow path portion 62b extend in the axial direction. The motor shaft inner flow path portion 62a and the gear shaft inner flow path portion 62b are connected to each other in the axial direction. The gear shaft inner flow path portion 62b is connected to one axial side (+Y side) of the motor shaft inner flow path portion 62a. Therefore, the oil O can flow between the motor shaft inner flow path portion 62a and the gear shaft inner flow path portion 62b, and it is easy for the oil O to flow appropriately between the inside of the motor housing 31 and the inside of the gear housing 32.

[0078] The end of the motor shaft inner flow path portion 62a on the other axial side (-Y side) is the end of the motor shaft inner flow path portion 62a on the upstream side, and is connected to the inside of the bearing holding portion 34b, that is, the end of the downstream side of the fourth connecting flow path portion 61e. That is, in the present embodiment, the second flow path portion 62 extends from the downstream end of the first flow path portion 61. Therefore, the first flow path portion 61 and the second flow path portion 62 can be connected in sequence, and the oil O can flow to the first flow path portion 61 and the second flow path portion 62 in sequence. As a result, compared with the case where the oil O flows in a branched manner in the flow path 60, it is possible to suppress the flow of the oil O from becoming complicated. Therefore, the oil O can flow more appropriately in the flow path 60.

[0079] The rotor core inner flow path portion 62c is provided in the rotor core 42. Thus, in the present embodiment, the motor shaft inner flow path portion 62a and the rotor core inner flow path portion 62c in the second flow path portion 62 are provided inside the rotor 40. That is, in the present embodiment, a part of the second flow path portion 62 is provided inside the rotor 40. The upstream end of the rotor core inner flow path portion 62c is connected to the motor shaft inner flow path portion 62a via the hole portion 41a. The downstream end of the rotor core inner flow path portion 62c opens inside the motor housing 31. The downstream end of the rotor core inner flow path portion 62c opens, for example, at the axial end of the rotor core 42.

[0080] When the pump 71 is driven, the oil O in the storage portion 39 flows in the first connection flow path portion 61a and flows into the pump chamber 75c from the suction port portion 73c. ​​The oil O that has flowed into the pump chamber 75c is discharged from the discharge port portion 73d into the mounting hole 36a and flows into the second connection flow path portion 61b. The oil O that has flowed into the second connection flow path portion 61b flows into the cooler 72 from the inlet port 72a. The oil O that has flowed into the cooler 72 is cooled by the water flowing in the cooler 72 and flows out from the outlet port 72b to the third connection flow path portion 61c. The oil O that has flowed out into the third connection flow path portion 61c flows into the fluid supply portion 61d and flows from one axial side (+Y side) to the other axial side (-Y side) in the fluid supply portion 61d.

[0081] A portion of the oil O that has flowed into the fluid supply portion 61d is ejected from the supply port 61f into the motor housing 31 and supplied to the stator 50. In this way, a portion of the oil O sucked up from the reservoir 39 by the pump 71 flows into the motor housing 31 after passing through the cooler 72. That is, the cooler 72 is disposed in the portion of the flow path 60 from the pump 71 to the portion where the oil O is delivered to the motor housing 31.

[0082] The remaining portion of the oil O that has flowed into the fluid supply portion 61d flows into the fourth connection flow path portion 61e from the end portion on the other axial side (-Y side) of the fluid supply portion 61d. The oil O that has flowed into the fourth connection flow path portion 61e flows in the fourth connection flow path portion 61e and flows into the bearing holding portion 34b. A portion of the oil O that has flowed into the bearing holding portion 34b is supplied as lubricating oil to the bearing 43b held by the bearing holding portion 34b. The remaining portion of the oil O that has flowed into the bearing holding portion 34b flows into the motor shaft inner flow path portion 62a from the end portion on the other axial side of the motor shaft inner flow path portion 62a and flows toward one axial side (+Y side).

[0083] A portion of the oil O that has flowed into the motor shaft inner flow path portion 62a flows into the rotor core inner flow path portion 62c from the hole portion 41a, and flows out from the rotor core inner flow path portion 62c to the inside of the motor housing 31. The oil O that has flowed out from the rotor core inner flow path portion 62c to the inside of the motor housing 31 is scattered radially outward by the centrifugal force generated by the rotation of the rotor 40, and is supplied to the coil ends 54a and 54b of the stator 50. Another portion of the oil O that has flowed into the motor shaft inner flow path portion 62a flows into the bearing holding portions 34a and 35b from the gap at the connection portion between the first gear shaft 23a and the motor shaft 41, and is supplied to the bearings 43a and 25b. The remaining portion of the oil O that has flowed into the motor shaft inner flow path portion 62a flows into the gear shaft inner flow path portion 62b. That is, in the second flow path portion 62 of the present embodiment, the oil O flows from the motor shaft inner flow path portion 62a to the gear shaft inner flow path portion 62b. The oil O that has flowed into the gear shaft inner flow path portion 62b flows toward one axial direction (+Y side), flows into the bearing holding portion 35a, and is supplied to the bearing 25a.

[0084] The oil O supplied from the fluid supply portion 61d to the stator 50, the oil O supplied from the fourth connection flow path portion 61e to the bearing 43b, the oil O supplied from the rotor core inner flow path portion 62c to the stator 50, and the oil O supplied from the motor shaft inner flow path portion 62a to the bearing 43a fall downward and are accumulated in the lower region of the motor housing 31. The oil O accumulated in the lower region of the motor housing 31 is returned to the reservoir 39 in the gear housing 32 via the partition wall opening 33a provided in the partition wall portion 33. The oil O supplied from the motor shaft inner flow path portion 62a to the bearing 25b and the oil O supplied from the gear shaft inner flow path portion 62b to the bearing 25a fall downward and are returned to the reservoir 39.

[0085] According to the present embodiment, as described above, the flow path 60 includes the first flow path portion 61 and the second flow path portion 62, the first flow path portion 61 having the supply port 61f for supplying the oil O to the stator 50, and at least a portion of the second flow path portion 62 being provided inside the rotor 40. Therefore, the oil O flowing in the flow path 60 can be appropriately supplied to the motor 10. Thus, the motor 10 can be appropriately cooled.

[0086] <Second embodiment>

[0087] Hereinafter, a second embodiment different from the first embodiment described above will be described. In the following description of this embodiment, regarding the same structure as that described in the first embodiment, the description is sometimes omitted by appropriately marking the same reference numerals. In addition, regarding the parts corresponding to the parts of the structure described in the first embodiment, the same names are marked and different reference numerals are marked, and the points different from the above structure are described, and the description of the same points as the above structure is sometimes omitted. In addition, in the following embodiment, as the structure whose description is omitted, the same structure as that described in the first embodiment can be adopted within the range that does not cause contradiction.

[0088] like Figure 6 As shown, the drive device 200 of the present embodiment has a control device 280 electrically connected to a wiring 292 extending from the pump 71. The control device 280 is located on the upper side of the housing 30. Therefore, by leading the wiring 292, for example, upward from the pump 71 inserted into the mounting hole 36a opened on the upper side, the pump 71 and the control device 280 can be easily connected through the wiring 292. Thus, the wiring operation of connecting the control device 280 and the pump 71 can be easily performed. The wiring 292 connects the connector portion 71b protruding upward from the pump body 71a in the pump 71 and the control device 280.

[0089] In the present embodiment, the control device 280 is located on the upper side of the motor housing 31. The control device 280 is mounted on the motor housing 31. In more detail, the control device 280 is located on the upper side of the housing protrusion 31d and is mounted on the housing protrusion 31d. The housing of the control device 280 may be separate from the motor housing 31, or a part thereof may be a part of a single component constituting the first circumferential wall portion 31c of the motor housing 31. The control device 280 is electrically connected to the stator 50. Thus, the control device 280 is electrically connected to the motor 10. Although not shown in the figure, the control device 280 has an inverter circuit that supplies power to the coil 54c. When viewed in the axial direction, the control device 280 is located radially outward of the gear housing 32. In the present embodiment, the control device 280 is located on the upper side of the gear housing 32.

[0090] In the present embodiment, the motor unit 290 is constituted by the motor 10, the motor housing 31, and the control device 280. That is, in the present embodiment, the motor unit 290 includes the motor 10, the motor housing 31, and the control device 280. In the present embodiment, at least a part of the second protrusion 291 is constituted by the control device 280. Therefore, compared with the case where the second protrusion 291 is constituted by only the housing protrusion 31d, it is easy to increase the size of the second protrusion 291 in the direction in which the second protrusion 291 protrudes. In the present embodiment, the second protrusion 291 is constituted by the housing protrusion 31d of the motor housing 31 and the control device 280.

[0091] A pipe P1 extending from a radiator (not shown) is connected to the control device 280. A flow path 281 connected to the pipe P1 is provided inside the control device 280. Water W as a refrigerant flows from the pipe P1 into the flow path 281. The water W flowing in the flow path 281 cools various parts of the control device 280 including the inverter circuit.

[0092] The drive device 200 has a pipe 293 connecting the control device 280 and the cooler 72. The pipe 293 is connected to the end of the downstream side of the flow path portion 281. The water W flowing in the flow path portion 281 flows into the cooler 72 via the pipe 293. The oil O flowing in the cooler 72 is cooled by heat exchange with the water W flowing in the cooler 72. The cooler 72 is connected to a pipe P2 extending from a radiator not shown. The water W flowing from the pipe 293 into the cooler 72 flows into the pipe P2 and returns to the radiator. In the present embodiment, the cooler 72 is located on the upper side of the gear housing 32, and the control device 280 is located on the upper side of the motor housing 31, so it is easy to connect the control device 280 and the cooler 72 through the pipe 293. In addition, the refrigerant flowing in the flow path portion 281 and the cooler 72 can also be a refrigerant other than water W such as oil.

[0093] The present invention is not limited to the above-mentioned embodiments, and other structures and other methods can also be adopted within the scope of the technical concept of the present invention. The mounting portion can be arranged at any part of the housing as long as it has a mounting hole. The mounting portion can be connected only to the gear housing or only to the motor housing. The mounting portion can also be arranged at the lower part of the housing. The mounting hole can be of any shape as long as it has an opening portion that opens toward the upper side on the outer surface of the housing. The entire pump can also be inserted into the mounting hole.

[0094] The pump can be any type of pump or any structure as long as it can convey the fluid. The flow path for the fluid conveyed by the pump can be set arbitrarily. The fluid flowing in the flow path can be any fluid as long as it is a fluid, for example, it can be a fluid other than oil such as water.

[0095] The predetermined direction in which the first protrusion of the gear housing protrudes is any direction as long as it is a direction perpendicular to the axial direction. The second protrusion of the motor unit only needs to be constituted by a part of the motor unit, and can be constituted by any part of the motor unit. The second protrusion may also be constituted only by the control device. In addition, for example, in a case where the motor unit has other parts besides the motor, the motor housing, and the control device, the second protrusion may also be constituted by at least a part of the other parts. The second protrusion only needs to protrude radially outward relative to the gear housing when viewed in the axial direction, and may protrude in directions other than the up and down directions. For example, in a case where the second protrusion protrudes in the horizontal direction, the cooler may also be installed on the horizontal side of the gear housing.

[0096] The cooler can be arranged arbitrarily. The cooler may not be located on the upper side of the gear housing. At least a part of the cooler may not overlap with the second protrusion in the axial direction. The cooler may be any type of cooler and may be a cooler of any structure as long as it can cool the fluid.

[0097] The use of the drive device of the present invention is not particularly limited. The drive device can be mounted on a vehicle for purposes other than rotating an axle, for example, or mounted on equipment other than a vehicle. The posture when using the drive device is not particularly limited. The central axis of the motor body of the drive device can be inclined relative to the horizontal direction, or can extend in the vertical direction.

[0098] In addition, the present technology can adopt the following structures.

[0099] (1) A drive device comprising: a motor having a rotor capable of rotating about a central axis and a stator opposed to the rotor with a gap therebetween; a gear mechanism connected to the rotor; a housing having a motor housing for accommodating the motor, a gear housing for accommodating the gear mechanism, and a storage portion for storing a fluid therein; and a pump mounted on the housing for transporting the fluid in the storage portion to the interior of the motor housing, the housing having a mounting portion having a mounting hole, the mounting hole having an opening portion opening upward on an outer surface of the housing, and at least a portion of the pump being inserted into the mounting hole from the opening portion.

[0100] (2) A drive device according to (1), wherein the gear housing has a first protrusion, the first protrusion is connected to one axial side of the motor housing and protrudes to one side than the motor housing in a specified direction perpendicular to the axial direction, and a mounting portion is provided on the first protrusion, which protrudes to the other axial side than the first protrusion, and at least a portion of the mounting portion overlaps with the motor housing in the specified direction.

[0101] (3) The driving device according to (2), wherein an upper surface of the mounting portion is connected to an upper surface of the gear housing, and the mounting portion extends downward from the upper surface of the gear housing.

[0102] (4) The driving device according to any one of (1) to (3), wherein the mounting portion is connected to the motor housing.

[0103] (5) A drive device according to any one of (1) to (4), wherein the gear mechanism comprises: a reduction device connected to the rotor; and a differential device connected to the reduction device, the differential device having a gear that can rotate around an output axis, and the lower surface of the mounting portion is located above the output axis.

[0104] (6) A drive device according to any one of (1) to (5), wherein the housing has: a partition wall portion that divides the interior of the motor housing and the interior of the gear housing; and a first connecting flow path portion that connects the interior of the storage portion and the pump, the storage portion is arranged on the lower side portion of the gear housing, and at least a portion of the first connecting flow path portion is arranged on the partition wall portion.

[0105] (7) The driving device according to (6), wherein the first connecting flow path portion has a suction flow path portion located below the mounting hole, and the pump has a suction port portion protruding downward, and the suction port portion is inserted into the suction flow path portion.

[0106] (8) A drive device according to (7), wherein the drive device has a cooler, which is arranged in a portion of a flow path for the flow of the fluid from the pump to the portion where the fluid is transported to the interior of the motor housing, and the housing has a second connecting flow path portion connecting the interior of the mounting hole and the cooler, and the second connecting flow path portion opens on a peripheral wall surface surrounding the pump in the inner surface of the mounting hole.

[0107] (9) A drive device according to (8), wherein a motor unit is formed having the motor and the motor housing, the motor unit having a second protrusion that protrudes radially outward relative to the gear housing when viewed in the axial direction, and at least a portion of the cooler is located on the upper side of the gear housing and overlaps with the second protrusion in the axial direction.

[0108] (10) The driving device according to (9), wherein the motor unit includes a control device electrically connected to the motor, and wherein at least a part of the second protrusion is constituted by the control device.

[0109] (11) The drive device according to any one of (1) to (9), wherein the drive device has a control device electrically connected to the wiring extending from the pump, and the control device is located on the upper side of the housing.

[0110] (12) A drive device according to any one of (1) to (11), wherein the drive device has a flow path for the fluid delivered by the pump to flow, and the flow path has: a first flow path portion having a supply port for providing the fluid to the stator; and a second flow path portion, at least a portion of which is arranged inside the rotor.

[0111] (13) The driving device according to (12), wherein the second flow path portion extends from an end portion on a downstream side of the first flow path portion.

[0112] The structures and methods described above in this specification can be appropriately combined within a range that does not contradict each other.

[0113] Description of symbols

[0114] 10: Motor; 20: Gear mechanism; 21: Speed ​​reduction device; 22: Differential device; 22b: Ring gear (gear); 30: Housing; 31: Motor housing; 32: Gear housing; 32e: First protrusion; 32f: Upper surface of gear housing; 33: Partition wall; 36: Mounting portion; 36a: Mounting hole; 36b: Opening; 36d: Peripheral wall surface; 36f: Upper surface of mounting portion; 36g: Lower surface of mounting portion; 39: Storage portion; 40: Rotor; 50: Stator Sub; 60: flow path; 61: first flow path portion; 61a: first connecting flow path portion; 61b: second connecting flow path portion; 61f: supply port; 61g: suction flow path portion; 62: second flow path portion; 71: pump; 72: cooler; 73c: suction port portion; 90, 290: motor unit; 91, 291: second protrusion; 100, 200: drive device; 280: control device; 292: wiring; J1: center axis; J3: output axis; O: oil (fluid).

Claims

1. A driving device, comprising: A motor having a rotor rotatable about a central axis and a stator opposed to the rotor with a gap therebetween; a gear mechanism connected to the rotor; a housing having a motor housing accommodating the motor therein, a gear housing accommodating the gear mechanism therein, and a storage portion storing a fluid therein; and a pump mounted on the housing to transport the fluid in the storage portion to the interior of the motor housing, The housing has a mounting portion, and the mounting portion has a mounting hole. The mounting hole has an opening portion that opens upward on the outer surface of the housing. At least a portion of the pump is inserted into the mounting hole from the opening.

2. The driving device according to claim 1, wherein: The gear housing has a first protrusion, which is connected to one side of the motor housing in the axial direction and protrudes to one side than the motor housing in a predetermined direction perpendicular to the axial direction. The first protrusion is provided with a mounting portion that protrudes toward the other side in the axial direction from the first protrusion. At least a portion of the mounting portion overlaps with the motor housing in the predetermined direction.

3. The driving device according to claim 2, wherein: The upper surface of the mounting portion is connected to the upper surface of the gear housing, The mounting portion extends from an upper surface of the gear housing toward a lower side.

4. The driving device according to claim 2, wherein: The mounting portion is connected to the motor housing.

5. The driving device according to claim 1, wherein: The gear mechanism has: a reduction gear connected to the rotor; and a differential device connected to the reduction gear, The differential device has a gear that can rotate about an output axis, The lower surface of the mounting portion is located above the output axis.

6. The driving device according to any one of claims 1 to 5, wherein: The housing has: a partition wall portion that divides the interior of the motor housing and the interior of the gear housing; as well as a first connecting flow path portion connecting the interior of the storage portion and the pump, The storage portion is disposed on the lower side of the gear housing. At least a portion of the first connecting flow path portion is provided in the partition wall portion.

7. The driving device according to claim 6, wherein: The first connecting flow path portion has a suction flow path portion located below the mounting hole, The pump has a suction port protruding downward. The suction port portion is inserted into the suction flow path portion.

8. The driving device according to claim 7, wherein: The drive device includes a cooler disposed in a portion of a flow path through which the fluid flows, from the pump to a portion where the fluid is delivered to the inside of the motor housing. The housing has a second connecting flow path portion connecting the interior of the mounting hole and the cooler. The second connecting flow path portion opens at a peripheral wall surface surrounding the pump in the inner surface of the mounting hole.

9. The driving device according to claim 8, wherein: A motor unit including the motor and the motor housing is formed. The motor unit has a second protrusion that protrudes radially outward from the gear housing when viewed in the axial direction. At least a portion of the cooler is located on the upper side of the gear housing and overlaps with the second protrusion in the axial direction.

10. The driving device according to claim 9, wherein: The motor unit has a control device electrically connected to the motor, At least a part of the second protrusion is constituted by the control device.

11. The driving device according to any one of claims 1 to 5, wherein: The drive device has a control device electrically connected to the wiring extending from the pump, The control device is located on the upper side of the housing.

12. The driving device according to any one of claims 1 to 5, wherein: The drive device has a flow path through which the fluid delivered by the pump flows. The flow path has: a first flow path portion having a supply port for supplying the fluid to the stator; and The second flow path portion is at least partially provided inside the rotor.

13. The driving device according to claim 12, wherein: The second flow path portion extends from an end portion on a downstream side of the first flow path portion.

Images