Drive unit

Abstract

To provide a drive device provided with a channel that keeps the hardness of a housing and is hard to limit the layout of the other structure.SOLUTION: A housing 6 of a drive device 1 has a first side wall portion 6a, a second side wall portion 6b, and a motor peripheral wall portion 6d surrounding an outer periphery of the motor. The channel has a first side wall inner channel 93 provided in a wall of the first side wall portion, a first housing inner channel 94 connected to the first side wall inner channel and extending inside a motor storage portion in an axial direction, a second side wall inner channel 95 connected to the first housing inner channel and provided in a wall of the second side wall portion, and a second housing inner channel 96 connected to the second wall inner channel and extending inside the motor storage portion in an axial direction. In the first housing inner channel and the second housing inner channel, supply holes 94a and 96a supplying the fluid to the motor are provided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, there has been active development of drive units to be installed in electric vehicles and the like. Such drive units are equipped with a cooling structure for cooling the stator of a rotating electric machine. For example, Patent Document 1 discloses a structure in which a coolant is supplied to a stator core body from two coolant supply pipes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-9967 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional structure, two pipes are connected to a branched flow path within a side wall located on one axial side of the motor. In this structure, a flow path extending from another flow path to supply refrigerant to the pipes and a flow path extending across the two pipes are concentrated within one side wall. As a result, the flow paths within one side wall are long and complex, which can reduce the strength and rigidity of the housing and limit the placement of other components attached to the side wall.

[0005] In view of the above circumstances, one object of the present invention is to provide a drive device in which a flow path is provided that maintains the strength of the housing and does not restrict the placement of other components. [Means for solving the problem]

[0006] One embodiment of a drive device of the present invention includes a motor having a rotor rotating about a motor axis and a stator surrounding the rotor, a housing having a motor accommodating portion that accommodates the motor, a fluid stored in the housing, and a flow path through which the fluid flows. The housing has a first sidewall portion located on one axial side of the motor and extending along a plane perpendicular to the motor axis, a second sidewall portion located on the other axial side of the motor and extending along a plane perpendicular to the motor axis, and a motor peripheral wall portion that surrounds the outer periphery of the motor. The flow path includes a first sidewall flow path provided in the wall of the first sidewall portion, a first housing flow path that connects to the first sidewall flow path and extends axially inside the motor accommodating portion, a second sidewall flow path that connects to the first housing flow path and is provided in the wall of the second sidewall portion, and a second housing flow path that connects to the second sidewall flow path and extends axially inside the motor accommodating portion. The first housing internal flow path and the second housing internal flow path are provided with supply holes for supplying the fluid to the motor. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to provide a drive device in which a flow path is provided that maintains the strength of the housing and does not restrict the arrangement of other components. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a conceptual diagram of a drive device according to one embodiment. [Figure 2] FIG. 2 is a perspective view of a bearing and a bearing holder arranged around the output axis J3 in the drive device of one embodiment. [Figure 3] FIG. 3 is a front view of the gear cover of one embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a drive device according to one embodiment. [Figure 5] FIG. 5 is a partial cross-sectional view of a modified driving device. [Figure 6] FIG. 6 is a front view of the housing body of the embodiment as seen from the gear accommodating portion side. [Figure 7] 7 is a cross-sectional view of the housing main body taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a perspective view of a flow path member according to one embodiment. [Figure 9] FIG. 9 is a schematic diagram of a flow path member according to a modified example. [Figure 10] FIG. 10 is a schematic cross-sectional view of a driving device 101 according to the first modification. [Figure 11] FIG. 11 is a cross-sectional view of a driving device 201 according to the second modification. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following explanation, the direction of gravity is defined based on the positional relationship when the drive unit 1 is mounted on a vehicle positioned on a horizontal road surface. In addition, in the drawings, an XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate.

[0010] In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (that is, the up-down direction), with the +Z direction being the upper side (opposite the direction of gravity) and the -Z direction being the lower side (the direction of gravity). The X-axis direction is perpendicular to the Z-axis direction and indicates the front-to-rear direction of the vehicle on which the drive unit 1 is mounted, with the -X direction being the front of the vehicle (one side in the front-to-rear direction) and the +X direction being the rear of the vehicle (the other side in the front-to-rear direction). However, it is also possible for the +X direction to be the front of the vehicle and the -X direction to be the rear of the vehicle. The Y-axis direction is perpendicular to both the X-axis and Z-axis directions and indicates the width direction (left-to-right direction) of the vehicle.

[0011] In the following description, unless otherwise specified, the direction parallel to the motor axis J1 (Y-axis direction) will be referred to simply as the "axial direction," the radial direction about the motor axis J1 will be referred to simply as the "radial direction," and the circumferential direction about the motor axis J1, i.e., around the axis of the motor axis J1, will be referred to simply as the "circumferential direction." However, the above "parallel direction" also includes a direction that is approximately parallel.

[0012] <Drive unit> Fig. 1 is a conceptual diagram of a drive unit 1 according to this embodiment. Note that, due to the schematic illustration in Fig. 1, the relative positional relationship of each component in the up-down direction (Z-axis direction) may differ from the actual positional relationship. In particular, in Fig. 1, the intermediate axis J2 and the output axis J3 are illustrated with their up-down positions reversed relative to each other.

[0013] The drive device 1 of this embodiment is mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV), and is used as the power source thereof.

[0014] The drive device 1 includes a motor 2, a transmission mechanism 3, an inverter 7, a housing 6, a fluid O stored in the housing 6, a pump 8, a cooler 9, and a plurality of bearings 5A, 5B, 5C, 5D, 5E, 5F, 5G, and 5H. , flow The cooling device includes a passage 90, a coolant L, and a coolant flow path 70.

[0015] The housing 6 has a motor accommodating portion 81 that accommodates the motor 2, a gear accommodating portion 82 that accommodates the transmission mechanism 3, and an inverter accommodating portion 89 that accommodates the inverter 7. The gear accommodating portion 82 is located on the other axial side (-Y side) of the motor accommodating portion 81. The inverter accommodating portion 89 is located above the motor accommodating portion 81.

[0016] <Motor> The motor 2 of this embodiment is an inner rotor type three-phase AC motor, and functions as both an electric motor and a generator.

[0017] The motor 2 includes a rotor 20 that rotates about a motor axis J1 that extends horizontally, and a stator 30 that is located radially outside the rotor 20. The motor 2 of this embodiment is an inner rotor type motor in which the rotor 20 is located inside the stator 30.

[0018] The stator 30 surrounds the rotor 20 from the radial outside. The stator 30 has a stator core 32, a coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator 30 is held in the housing 6.

[0019] The rotor 20 rotates about a motor axis J1 extending horizontally. The rotor 20 has a motor shaft 21A, a rotor core 24 fixed to the outer peripheral surface of the motor shaft 21A, and a rotor magnet (not shown) fixed to the rotor core. Torque of the rotor 20 is transmitted to a transmission mechanism 3.

[0020] The motor shaft 21A extends axially around the motor axis J1. The motor shaft 21A rotates around the motor axis J1. The motor shaft 21A is a hollow shaft with an axially extending hollow portion inside. The motor shaft 21A is rotatably supported by the housing 6 via bearings 5C and 5D.

[0021] The stator 30 is held in the housing 6. The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 has an annular stator core 32 centered on the motor axis J1, a coil 31 attached to the stator core 32, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator core 32 has a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumferential surface of the annular yoke. Coil wire is arranged between the magnetic pole teeth. The coil wire located in the gap between adjacent magnetic pole teeth constitutes the coil 31. The insulator is made of an insulating material.

[0022] <Transmission mechanism> The transmission mechanism 3 transmits the power of the motor 2 and outputs it to the output shaft 55. The transmission mechanism 3 has a reduction gear 3a and a differential gear 3b. The torque output from the motor 2 is transmitted to the differential gear 3b via the reduction gear 3a. The reduction gear 3a is a parallel-shaft gear type reducer in which the axes of the gears are arranged in parallel. When the vehicle turns, the differential gear 3b transmits the same torque to both the left and right wheels while absorbing the speed difference between the left and right wheels.

[0023] The transmission mechanism 3 has a first shaft (shaft) 21B, a second shaft (shaft) 45, a first gear 41, a second gear 42, and a third gear 43. The differential device 3b has a ring gear 51, a differential case 50, and a differential mechanism section 50c disposed inside the differential case 50. That is, the transmission mechanism 3 has the first shaft 21B, the second shaft 45, the multiple gears 41, 42, 43, 51, the differential case 50, and the differential mechanism section 50c.

[0024] The first shaft 21B extends in the axial direction around the motor axis J1. The first shaft 21B is arranged coaxially with the motor shaft 21A. The first shaft 21B is coupled at an end on one axial side (+Y side) to an end on the other axial side (-Y side) of the motor shaft 21A. As a result, the first shaft 21B is coupled to the rotor 20 from the other axial side.

[0025] The outer diameter of the end of first shaft 21B on one axial side (+Y side) is smaller than the inner diameter of the end of motor shaft 21A on the other axial side (-Y side). The outer peripheral surface of the end of first shaft 21B on one axial side (+Y side) and the inner peripheral surface of the end of motor shaft 21A on the other axial side (-Y side) are provided with splines that mesh with each other.

[0026] In this embodiment, the shafts are coupled by inserting the end of the first shaft 21B into the hollow portion at the end of the motor shaft 21A. However, a configuration in which the end of the motor shaft 21A is coupled by inserting the end of the first shaft 21B into the hollow portion at the end of the motor shaft 21A may also be adopted. In this case, splines that mesh with each other are provided on the outer circumferential surface of the end of the motor shaft 21A and the inner circumferential surface of the end of the first shaft 21B.

[0027] The first shaft 21B rotates around the motor axis J1 together with the motor shaft 21A. The first shaft 21B is a hollow shaft having a hollow portion inside. First shaft 21B is rotatably supported by the housing 6 via bearings 5A and 5B.

[0028] The first gear 41 is provided on the outer peripheral surface of the first shaft 21B. The first gear 41 rotates together with the first shaft 21B around the motor axis J1. The second shaft 45 rotates around an intermediate axis J2 that is parallel to the motor axis J1. The second gear 42 and the third gear 43 are arranged side by side in the axial direction. The second gear 42 and the third gear 43 are provided on the outer peripheral surface of the second shaft 45. The second gear 42 and the third gear 43 are connected via the second shaft 45. The second gear 42 and the third gear 43 rotate around the intermediate axis J2. The second gear 42 meshes with the first gear 41. The third gear 43 meshes with a ring gear 51 of the differential device 3b.

[0029] The ring gear 51 rotates about an output axis J3 that is parallel to the motor axis J1. Torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear device 3a. The ring gear 51 is fixed to the differential case 50.

[0030] The differential case 50 has a case portion 50b that houses the differential mechanism portion 50c therein, and a differential case shaft (shaft) 50a that protrudes from the case portion 50b on one axial side and the other axial side. That is, the transmission mechanism 3 has the differential case shaft 50a. The differential case shaft 50a is cylindrical and extends axially around the output axis J3. The ring gear 51 is provided on the outer peripheral surface of the differential case shaft 50a. The differential case shaft 50a rotates together with the ring gear 51 around the output axis J3.

[0031] The pair of output shafts 55 are connected to the differential device 3b. The pair of output shafts 55 protrude from the differential case 50 of the differential device 3b to one side and the other side in the axial direction. The output shafts 55 are disposed inside the differential case shafts 50a. The output shafts 55 are rotatably supported on the inner circumferential surface of the differential case shafts 50a via bearings (not shown).

[0032] The torque output from motor 2 is Transmission mechanism 3 The power is transmitted to a ring gear 51 of the differential device 3b via the first shaft 21B, the first gear 41, the second gear 42, the second shaft 45, and the third gear 43, and is output to an output shaft 55 via a differential mechanism portion 50c of the differential device 3b. The multiple gears (41, 42, 43, 51) of the transmission mechanism 3 transmit the power of the motor 2 in the order of the first shaft 21B, the second shaft 45, and the differential case shaft 50a.

[0033] <Housing> The housing 6 has a housing main body 6B, a motor cover 6A, a gear cover 6C, and an inverter cover 6D. The housing main body 6B, motor cover 6A, gear cover 6C, and inverter cover 6D are each separate members. The motor cover 6A is located on one axial side (+Y side) of the housing main body 6B. The gear cover 6C is located on the other axial side (-Y side) of the housing main body 6B. The inverter cover 6D is located on the upper side of the housing main body 6B.

[0034] The housing 6 has a motor accommodating portion 81, a gear accommodating portion 82, and an inverter accommodating portion 89. The motor accommodating portion 81, the gear accommodating portion 82, and the inverter accommodating portion 89 are formed by the housing main body 6B, the motor cover 6A, the gear cover 6C, and the inverter cover 6D.

[0035] The motor accommodating section 81 is composed of a cylindrical section of the housing main body 6B and a motor cover 6A that covers an opening on one axial side (+Y side) of the cylindrical section. The motor 2 is disposed in a space surrounded by the housing main body 6B and the motor cover 6A.

[0036] The gear accommodating portion 82 is configured by a recessed portion that opens to the other axial side (-Y side) of the housing main body 6B and a gear cover 6C that covers the opening of the recessed portion. The transmission mechanism 3 is disposed in the space surrounded by the housing main body 6B and the gear cover.

[0037] The inverter accommodating section 89 is composed of a box-shaped section that opens to the upper side of the housing main body 6B and an inverter cover 6D that covers the opening of the box-shaped section. The inverter 7 is disposed in the space surrounded by the housing main body 6B and the inverter cover 6D.

[0038] The housing 6 has a first side wall portion 6a, a second side wall portion (side wall portion) 6b, and a third side wall portion 6c extending along a plane perpendicular to the motor axis J1, a motor peripheral wall portion 6d surrounding the motor 2 from the radial outside, and a gear peripheral wall portion 6e surrounding the transmission mechanism 3 from the radial outside.

[0039] The first side wall 6a is provided on the motor cover 6A. The first side wall 6a constitutes a part of the motor accommodating portion 81. The first side wall 6a is located on one axial side (+Y side) of the motor 2.

[0040] The second side wall 6b is provided on the housing main body 6B. The second side wall 6b is located on the other axial side (-Y side) of the motor 2. The second side wall 6b separates the internal space of the motor accommodating portion 81 from the internal space of the gear accommodating portion 82. The second side wall 6b constitutes a part of the motor accommodating portion 81 and the gear accommodating portion 82.

[0041] The second side wall portion 6b has a vertical wall region 6k extending along the axial direction. The vertical wall region 6k faces radially inward from the output axis J3. The second side wall portion 6b is configured in a stepped shape with the vertical wall region 6k as a boundary, with the region closer to the output axis J3 positioned further axially than the region further away. The vertical wall region 6k expands the internal space of the gear accommodating portion 82 around the output axis J3 to one axial side (+Y side). By providing the vertical wall region 6k on the second side wall portion 6b, it is possible to ensure a space for arranging the differential device 3b within the gear accommodating portion 82 that is wider in the axial direction than other regions.

[0042] The second side wall portion 6b is provided with a shaft passing hole 6s and a through hole 6h. The shaft passing hole 6s connects the internal spaces of the motor accommodating portion 81 and the gear accommodating portion 82. The shaft passing hole 6s accommodates a bearing 5C that supports the motor shaft 21A and a through hole 6h that supports the first shaft 21B. Bearing 5B The motor shaft 21A and the first shaft 21B are connected to each other inside the shaft passing hole 6s.

[0043] The through-hole 6h is provided in the vertical wall region 6k of the second side wall portion 6b. Therefore, the through-hole 6h penetrates the second side wall portion 6b in the radial direction of the output axis J3. The through-hole 6h communicates the internal space of the motor accommodating portion 81 with the internal space of the gear accommodating portion 82.

[0044] The third side wall portion 6c is provided on the gear cover 6C. The third side wall portion 6c constitutes a part of the gear accommodating portion 82. The third side wall portion 6c is disposed on the other axial side (-Y side) of the transmission mechanism 3.

[0045] The motor peripheral wall 6d is provided on the housing main body 6B. The motor peripheral wall 6d constitutes a part of the motor accommodating portion 81. The motor peripheral wall 6d is cylindrical and extends axially with the motor axis J1 as its center. The motor peripheral wall 6d connects the second side wall 6b and the first side wall 6a. The motor peripheral wall 6d surrounds the outer periphery of the motor 2 from the radial outside of the motor axis J1.

[0046] The gear peripheral wall portion 6e is formed by a portion of the housing main body 6B and a portion of the gear cover 6C. The gear peripheral wall portion 6e forms a portion of the gear accommodating portion 82. The gear peripheral wall portion 6e extends along the axial direction. The gear peripheral wall portion 6e connects the third side wall portion 6c and the second side wall portion 6b. The gear peripheral wall portion 6e surrounds the gears 41, 42, 43, and 51 from the radial outside of the motor axis J1, the intermediate axis J2, and the output axis J3.

[0047] <Bearings> A plurality of bearings 5A, 5B, 5C, 5D, 5E, 5F, 5G, and 5H are held in the housing 6 and rotatably support any one of the motor shaft 21A, the first shaft 21B, the second shaft 45, and the differential case shaft 50a.

[0048] The motor shaft 21A is supported by bearings 5C and 5D. The bearing 5C is disposed inside a shaft passage hole 6s provided in the second side wall portion 6b and is held by the second side wall portion 6b. The bearing 5D is held by the first side wall portion 6a. A bearing holder 60D that holds the bearing 5D is provided on the first side wall portion 6a.

[0049] The first shaft 21B is supported by bearings 5A and 5B. The bearing (second bearing) 5A is held by the third side wall portion 6c. A bearing holder (second bearing holder) 60A that holds the bearing 5A is provided on the third side wall portion 6c. That is, the bearing holder 60A supports the shaft (first shaft 21B) of the transmission mechanism 3 via the bearing 5A. The bearing 5B is disposed inside a shaft passing hole 6s provided in the second side wall portion 6b and is held by the second side wall portion 6b.

[0050] The second shaft 45 is supported by bearings 5E and 5F. The bearing 5E is held by the third side wall portion 6c. A bearing holder 60E that holds the bearing 5E is provided on the third side wall portion 6c. A bearing (first bearing) 5F is held by the second side wall portion 6b. A bearing holder (first bearing holder) 60F that holds the bearing 5F is provided on the second side wall portion 6b. In other words, the bearing holder 60F supports the shaft (second shaft 45) of the transmission mechanism 3 via the bearing 5F.

[0051] The differential case shaft 50a is supported by bearings 5G and 5H. The bearing 5G is held by the third side wall portion 6c. A bearing holder 60G that holds the bearing 5G is provided on the third side wall portion 6c. The bearing 5H is held by the second side wall portion 6b. A bearing holder 60H that holds the bearing 5H is provided on the second side wall portion 6b. The bearing holder 60H is provided on a first gear-opposing surface (gear-opposing surface) 6p of the second side wall portion 6b that faces the transmission mechanism 3. The bearing 5H is Bearing holder 60H The differential case shaft 50a is supported via the

[0052] FIG. 2 is a perspective view of the bearing 5H and the bearing holder 60H. 2, the bearing holder 60H has a cylindrical portion 6f that surrounds the bearing 5H. The cylindrical portion 6f is cylindrical and has its center on the output axis J3. The cylindrical portion 6f protrudes in the axial direction from the surface of the second side wall portion 6b that faces the other axial side (-Y side).

[0053] The cylindrical portion 6f is provided with a cutout portion (opening) 6g extending axially from the tip. Therefore, the bearing 5H is exposed at the cutout portion 6g radially outward from the output axis J3. The cutout portion 6g is provided in a portion of the cylindrical portion 6f that is disposed on the vehicle front side (-X side, one side in the front-to-rear direction) with respect to the output axis J3. The portion of the cylindrical portion 6f where the cutout portion 6g is provided faces the vertical wall region 6k of the second side wall portion 6b. As described above, the vertical wall region 6k is provided with a through hole (opening) 6h. The cutout portion 6g and the through hole 6h are arranged side by side in the radial direction of the output axis J3.

[0054] <Fluid> The fluid O accumulates in the housing 6. The fluid O circulates in a flow path 90, which will be described later. In this embodiment, the fluid O is oil. The fluid O is used not only to cool the motor 2 but also to lubricate the transmission mechanism 3. It is preferable to use, as the fluid O, an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid), which has a relatively low viscosity, in order to function as a lubricating oil and a cooling oil.

[0055] A fluid reservoir P in which the fluid O accumulates is provided in a lower region within the housing 6. In this embodiment, the fluid reservoir is provided in the gear accommodating portion 82. The fluid O accumulated in the fluid reservoir P is scooped up by the operation of the transmission mechanism 3 and dispersed within the gear accommodating portion 82.

[0056] The fluid O diffused within the gear accommodating portion 82 is supplied to each gear of the transmission mechanism 3 within the gear accommodating portion 82, and the fluid O is distributed over the gear tooth surfaces. The fluid O supplied to the transmission mechanism 3 and used for lubrication drips and is collected in a fluid reservoir P within the gear accommodating portion 82.

[0057] FIG. 3 is a front view of the gear cover 6C. 3, a second gear-opposing surface 6q that faces the transmission mechanism 3 is provided on the third side wall portion 6c of the housing 6. The above-mentioned bearing holder 60G is provided on the second gear-opposing surface 6q. The bearing holder 60G has a cylindrical portion 6t that is centered on the output axis J3.

[0058] The second gear opposing surface 6q is provided with a guide rib 6w located directly above the cylindrical portion 6t of the bearing holder 60G, and a guide groove portion 6u extending along the guide rib 6w. The guide rib 6w protrudes from the second gear opposing surface 6q to one axial side (+Y side). The guide rib 6w extends in the up-down direction. The lower end of the guide rib 6w is connected to the outer peripheral surface of the cylindrical portion 6t. The guide groove portion 6u is located on the other front-rear direction side (+X side, vehicle rear side) of the guide rib 6w. The guide groove portion 6u penetrates the cylindrical portion 6t from the inside to the outside.

[0059] The ring gear 51, which rotates about the output axis J3, scoops up the fluid O that accumulates inside the gear accommodating portion 82. When the vehicle travels forward (-X side), the ring gear 51 scoops up the fluid O on the vehicle rear side (+X side) of the ring gear 51. The fluid O scooped up by the ring gear 51 splashes up onto the ring gear 51 and hits the surface of the guide rib 6w that faces the vehicle rear side (+X side). The fluid O that hits the guide rib 6w flows into the guide groove portion 6u, flows along the inner surface of the guide groove portion 6u, and is guided inside the bearing holder 60G. In this way, the fluid O lubricates the bearing 5G.

[0060] <Flow path> 1 is provided in the housing 6. The flow path 90 is a circulation path through which the fluid O flows. That is, the fluid O flows through the flow path 90 provided in the housing 6. The flow path 90 is a path for the fluid O that supplies the fluid O from the fluid reservoir P to the motor 2 and the transmission mechanism 3.

[0061] The flow path 90 is provided with a pump 8 and a cooler 9. The pump 8 and the cooler 9 are fixed to the outer surface of the housing 6, respectively.

[0062] The pump 8 pumps the fluid O in the flow path 90. The pump 8 is an electric pump that is driven by electricity. The pump 8 may also be a mechanical pump that operates in conjunction with the driving of the transmission mechanism 3. When the pump 8 is a mechanical pump, the pump 8 is connected to the output shaft 55 or the differential case shaft 50a via a gear or the like, and is driven by the power of the transmission mechanism 3.

[0063] The cooler 9 cools the fluid O in the flow path 90. An internal flow path (not shown) through which the fluid O flows and an internal refrigerant flow path (not shown) through which the refrigerant L flows are provided inside the cooler 9. The cooler 9 is a heat exchanger that cools the fluid O by transferring heat from the fluid O to the refrigerant L.

[0064] The flow path 90 of this embodiment has an intake flow path 91, a discharge flow path 92, a first side wall internal flow path 93, a first housing internal flow path (housing internal flow path) 94, a second side wall internal flow path 95, a second housing internal flow path 96, a first shaft internal flow path 97A, a third housing internal flow path 98, a third side wall internal flow path 99, and a second shaft internal flow path 97B.

[0065] The intake passage 91, a portion of the discharge passage 92, the first sidewall inner passage 93, the second sidewall inner passage 95, and the third sidewall inner passage 99 are holes provided in the housing 6. The intake passage 91, a portion of the discharge passage 92, the first sidewall inner passage 93, the second sidewall inner passage 95, and the third sidewall inner passage 99 are formed by drilling holes in the wall of the housing 6.

[0066] A portion of the discharge flow path 92, the first housing internal flow path 94, the second housing internal flow path 96, and the third housing internal flow path 98 are pipe members arranged inside the housing 6. A portion of the discharge flow path 92, the first housing internal flow path 94, and the second housing internal flow path 96 are arranged inside the motor accommodating portion 81. On the other hand, the third housing internal flow path 98 is arranged inside the gear accommodating portion 82.

[0067] The first shaft in-flow path 97A and the second shaft in-flow path 97B are provided in hollow portions of the motor shaft 21A and the first shaft 21B, respectively. The hollow portions of the motor shaft 21A and the first shaft 21B are connected to each other. Therefore, the fluid O in the first shaft in-flow path 97A and the fluid O in the second shaft in-flow path 97B merge inside the motor shaft 21A or the first shaft 21B.

[0068] (Suction flow path) The suction passage 91 connects the fluid reservoir P of the housing 6 with the pump 8. The upstream end of the suction passage 91 opens into the fluid reservoir P. The suction passage 91 penetrates inside the wall of the gear accommodating portion 82. The suction passage 91 guides the fluid O from the fluid reservoir P to the pump 8.

[0069] (Discharge flow path) The discharge flow path 92 connects the pump 8 and the first side-wall inner flow path 93. A cooler 9 is disposed in the path of the discharge flow path 92. The discharge flow path 92 has a pipe portion 92a, a first hole portion (hole portion) 92b, and a second hole portion (hole portion) 92c. The pipe portion 92a is shaped like a pipe and is disposed in the internal space of the motor accommodating portion 81. Meanwhile, the first hole portion 92b and the second hole portion 92c are formed in the wall portion of the housing 6 by drilling. The fluid O flows through the discharge flow path 92 in the order of the second hole portion 92c, the first hole portion 92b, and the pipe portion 92a.

[0070] The second hole 92c connects the discharge port of the pump 8 and the inlet of the cooler 9. The second hole 92c supplies the fluid O from the pump 8 to the cooler 9. The first hole 92b Outlet and the internal space of the motor accommodating portion 81. A stepped surface 81d facing one axial side (+Y side) is provided on the inner surface of the motor peripheral wall portion 6d. The first hole portion 92b opens to the stepped surface 81d.

[0071] The pipe portion 92a extends along the axial direction. An end portion on the other axial side (-Y side) of the pipe portion 92a is inserted into an opening of a first hole portion 92b provided in the step surface 81d. Meanwhile, an end portion on one axial side (+Y side) of the pipe portion 92a is inserted into an opening of a first side-wall inner flow path 93 provided in the first side wall portion 6a. In this way, the pipe portion 92a connects the opening of the first hole portion 92b and the first side-wall inner flow path 93. The fluid O in the pipe portion 92a flows from the other axial side (-Y side) to one axial side (+Y side). The pipe portion 92a is disposed inside the motor accommodating portion 81 and relays between the pump 8 and the first housing inner flow path 94.

[0072] According to this embodiment, the discharge flow path 92 has not only holes (first hole 92b and second hole 92c) provided in the wall of the housing 6, but also a pipe portion 92a. If the entire length of the discharge flow path 92 were to be holes, it would be necessary to increase the thickness of the housing where the holes are provided, which would increase the weight of the housing. According to this embodiment, by providing a portion of the discharge flow path 92 as the pipe portion 92a, the weight of the housing 6 can be reduced.

[0073] According to this embodiment, the pipe portion 92a is disposed in the internal space of the motor accommodating portion 81, so that the pipe portion 92a does not protrude from the outer surface of the housing 6. According to this embodiment, the pipe portion 92a is disposed in the dead space within the motor accommodating portion 81, so that the drive unit 1 can be made smaller than when the pipe portion 92a is disposed externally.

[0074] (First side wall flow passage) The first side-wall internal flow passage 93 is provided within the wall of the first side wall portion 6a. That is, the first side-wall internal flow passage 93 is provided in the wall portion of the housing. The first side-wall internal flow passage 93 extends along a plane perpendicular to the motor axis J1. The first side-wall internal flow passage 93 connects to the discharge flow passage 92 at its upstream end. The first side-wall internal flow passage 93 connects to the interior of the bearing holder 60D at its downstream end. The first side-wall internal flow passage 93 connects to the first housing internal flow passage 94 in the region between the upstream end and the downstream end. The first side-wall internal flow passage 93 connects the pipe portion 92a, the first housing internal flow passage 94, and the interior of the bearing holder 60D.

[0075] The hollow portion of the motor shaft 21A opens into the interior of the bearing holder 60D. The fluid O flowing from the first sidewall internal flow path 93 into the interior of the bearing holder 60D lubricates the bearing 5D held in the bearing holder 60D and also flows into the interior of the motor shaft 21A. Therefore, the first sidewall internal flow path 93 is connected to the first shaft internal flow path 97A at its downstream end.

[0076] The first side-wall flow path 93 has a first region 93a and a second region 93b. The first region 93a connects the discharge flow path 92 and the first-housing flow path 94. The second region 93b connects the first-housing flow path 94 and the first-shaft flow path 97A. A portion of the fluid O that flows from the discharge flow path 92 into the first side-wall flow path 93 and through the first region 93a flows into the first-housing flow path 94 and the other portion flows into the second region 93b. Furthermore, the fluid O that flows into the second region 93b flows into the first-shaft flow path 97A.

[0077] 4 is a cross-sectional view of the drive unit 1 taken along a plane perpendicular to the motor axis J1. In FIG. 4, the first sidewall inner flow passage 93 is indicated by a virtual line (two-dot chain line). As shown in FIG. 4, the first region 93a is disposed radially outward of the motor 2 when viewed from the axial direction. On the other hand, the second region 93b at least partially overlaps with the motor 2 when viewed from the axial direction.

[0078] In this embodiment, the first sidewall flow path 93 is connected to the first housing flow path 94 in a path extending from the discharge flow path 92 to the first shaft flow path 97A. This allows the first sidewall flow path 93 to be a continuous flow path that does not branch off along the way. According to this embodiment, there is no need to provide complex holes in the first sidewall 6a. As a result, not only can a decrease in the strength of the first sidewall 6a be suppressed, but restrictions on the placement of other components attached to the first sidewall 6a can also be suppressed. In addition, First side wall inner flow passage 93 Alternatively, the first passage 97A may be branched into two branches inside the first side wall portion 6a, and the branched branches may be connected to the first shaft internal flow path 97A and the first housing internal flow path 94, respectively.

[0079] (First housing internal flow path) As shown in FIG. 1 , the first housing internal flow path 94 is connected to the first side-wall internal flow path 93. The first housing internal flow path 94 extends axially inside the motor accommodating portion 81. An end portion on one axial side (+Y side) of the first housing internal flow path 94 is inserted into an opening of the first side-wall internal flow path 93 provided in the first side wall portion 6a. Meanwhile, an end portion on the other axial side (-Y side) of the first housing internal flow path 94 is inserted into an opening of the second side-wall internal flow path 95 provided in the second side wall portion 6b. The fluid O in the first housing internal flow path 94 flows from one axial side (+Y side) to the other axial side (-Y side).

[0080] The first housing flow path 94 is provided with a first supply hole (supply hole) 94a that supplies fluid O to the motor 2 and a second supply hole (supply hole) 94b that supplies fluid O to the bearing 5H. The first supply hole 94a and the second supply hole 94b are holes that penetrate the pipe that constitutes the first housing flow path 94 in the thickness direction.

[0081] The opening direction of the first supply hole 94a and the opening direction of the second supply hole 94b are opposite to each other in the front-to-rear direction of the vehicle. More specifically, the opening direction of the first supply hole 94a faces one side in the front-to-rear direction (-X side, front side of the vehicle). On the other hand, the opening direction of the second supply hole 94b faces the other side in the front-to-rear direction (+X side, rear side of the vehicle).

[0082] The first supply hole 94a ejects the fluid O toward the motor 2 due to the pressure inside the first housing flow path 94. Similarly, the second supply hole 94b ejects the fluid O toward the bearing 5H due to the pressure inside the first housing flow path 94.

[0083] 4, the first housing internal flow path 94 is disposed on the side of the stator core 32. In this embodiment, the first housing internal flow path 94 is disposed on the other side in the front-to-rear direction (+X side, vehicle rear side) of the stator core 32.

[0084] The first housing flow path 94 in this embodiment is disposed below one fixed portion 32a of the stator core 32. The stator core 32 has a plurality of fixed portions 32a that protrude radially outward. The fixed portions 32a are provided with insertion holes 32b that axially penetrate the fixed portions 32a. Bolts 32c extending in the axial direction are passed through the insertion holes 32b. The bolts 32c are fastened to threaded holes (not shown) provided on the inner surface of the housing 6. Fastening the bolts 32c to the threaded holes fixes the fixed portions 32a to the inner surface of the housing 6. That is, the stator core 32 is fixed to the housing 6 at the fixed portions 32a. The stator core 32 in this embodiment has four fixed portions 32a. The multiple fixed portions 32a are arranged at equal intervals along the circumferential direction. The first supply hole 94a of the first housing internal flow path 94 jets the fluid O toward the outer circumferential surface of the stator core 32 below one of the fixed portions 32a.

[0085] In the present embodiment, the radial position of the first housing internal flow passage 94 overlaps with the radial position of the fixed portion 32a. According to the present embodiment, the first housing internal flow passage 94 can be disposed close to the outer peripheral surface of the stator core 32, and the fluid O can be efficiently supplied to the stator 30 from the first supply holes 94a.

[0086] As shown in FIG. 1 , the first housing flow path 94 of this embodiment is provided with a plurality of first supply holes 94a. The plurality of first supply holes 94a are aligned along the axial direction. As described above, some of the plurality of first supply holes 94a supply fluid O to the outer peripheral surface of the stator core 32. The other of the plurality of first supply holes 94a supply fluid O to the coil ends of the coils 31 protruding from one axial side and the other axial side of the stator core 32. The fluid O supplied to the stator core 32 and the coils 31 absorbs heat from the stator 30 as it flows along the surfaces of the stator core 32 and the coils 31, thereby cooling the stator 30. Furthermore, the fluid O drips from the stator 30, reaches a lower region of the internal space of the motor accommodating portion 81, and returns to the fluid reservoir P via a through-hole (not shown) provided in the second side wall portion 6b.

[0087] The first housing internal flow path 94 and the pipe portion 92a of the discharge flow path 92 are connected to each other by a connecting portion 4a. The first housing internal flow path 94, the pipe portion 92a, and the connecting portion 4a are composed of a single member, the flow path member 4. The configuration of the flow path member 4 will be described in detail later.

[0088] The first housing flow path 94 is disposed along the vertical wall region 6k of the second side wall portion 6b. As described above, the vertical wall region 6k is provided with a through hole 6h. The through hole 6h is provided in a portion of the vertical wall region 6k that faces the first housing flow path 94. The second supply hole 94b of the first housing flow path 94 faces the internal space of the gear accommodating portion 82 via the through hole 6h.

[0089] As shown in Fig. 2, the second supply hole 94b, the through hole 6h, and the cutout 6g of the bearing holder 60H are aligned radially about the output axis J3. That is, the second supply hole 94b faces the outer peripheral surface of the bearing 5H via the through hole 6h and the bearing holder 60H. The fluid O ejected from the second supply hole 94b passes through the through hole 6h and the cutout 6g and is supplied to the bearing 5H. This allows the fluid O to lubricate the bearing 5H.

[0090] According to this embodiment, the first housing flow path 94 in the form of a pipe disposed inside the motor housing portion 81 flows into the gear housing portion 82. Distributed to The fluid O can be supplied to the bearing 5H placed therein. Therefore, it is not necessary to provide a reservoir (for example, a catch tank) inside the gear accommodating portion 82 for supplying the fluid O to the bearing 5H. This simplifies the structure of the gear accommodating portion 82, and the entire drive device 1 can be made smaller.

[0091] According to the first housing flow path 94 of this embodiment, the fluid O can be supplied to the interiors of the different housing portions (the motor housing portion 81 and the gear housing portion 82). This simplifies the structure of the flow path 90 compared to when a flow path is provided inside each housing portion. As a result, the pressure loss within the flow path 90 can be reduced, and the power consumption of the pump 8 can be suppressed. Furthermore, the arrangement space for the flow path 90 can be reduced, and the drive unit 1 can be made more compact.

[0092] According to this embodiment, the vertical wall region 6k is provided with a through-hole 6h, and the cylindrical portion 6f is provided with a notch 6g as an opening through which the fluid O passes. As a result, even if the direction in which the first housing internal flow path 94 extends and the output axis J3, which is the center of the bearing 5H, are arranged parallel to each other, the fluid O can be supplied to the bearing 5H without being obstructed by the vertical wall region 6k and the cylindrical portion 6f. In other words, a configuration can be adopted in which the direction in which the first housing internal flow path 94 extends is arranged parallel to the output axis J3, which increases the degree of freedom in the arrangement of the first housing internal flow path 94.

[0093] In the present embodiment, the second side wall 6b is provided with two openings, the through hole 6h and the notch 6g, as openings through which the fluid O passes. However, the openings through which the fluid O passes are not limited to this embodiment. That is, the second supply hole 94b only needs to face the bearing 5H via openings (the through hole 6h and the notch 6g in this embodiment) provided in the second side wall 6b. That is, the openings are not limited to a specific configuration (shape, posture, direction, number, etc.), as long as they open a portion of the second side wall 6b that blocks the passage of the fluid O between the second supply hole 94b and the bearing 5H.

[0094] In this embodiment, the opening area H1 of the through hole 6h is larger than the opening area H2 of the notch 6g. When the drive unit 1 is subjected to large vibrations, the direction of the fluid O ejected from the second supply hole 94b oscillates in the direction of the vibrations. By making the opening area H1 of the through hole 6h sufficiently large, the fluid O can be delivered to the inside of the gear accommodating portion 82 even when the direction of the fluid O ejected from the second supply hole 94b is unstable. In other words, even if the fluid O ejected from the second supply hole 94b cannot be supplied to the bearing 5H, it can at least be delivered to the inside of the gear accommodating portion 82, thereby preventing an increase in the amount of fluid discharged into the motor accommodating portion 81. If the fluid O were to be discharged from the second supply hole 94b into the motor accommodating portion 81, the level of the fluid O temporarily accumulated inside the motor accommodating portion 81 would be higher than the lower end of the rotor 20, which could increase the stirring resistance of the rotor 20. According to this embodiment, an increase in the level of the fluid O inside the motor accommodating portion 81 can be prevented. On the other hand, if the opening area H2 of the cutout portion 6g is made too large, the rigidity of the bearing holder 60H may decrease, causing the bearing 5H to be held unstable. For this reason, there is a limit to the opening area H2 of the cutout portion 6g, and it is difficult to make it larger than the opening area H1 of the through hole 6h. According to this embodiment, by making the opening areas H1 and H2 have the above-mentioned relationship, it is possible to stabilize the holding of the bearing 5H by the bearing holder 60H while suppressing an increase in the liquid level of the fluid O inside the motor housing portion 81.

[0095] In this specification, the opening area H2 of the cutout portion 6g is the area of ​​the region surrounded by the inner edge of the cutout portion 6g and the extension line of the tip edge of the bearing holder 60H when viewing the cutout portion 6g from the radial direction of the output axis J3.

[0096] In this embodiment, the second supply hole 94b, the opening of the second side wall portion 6b (in this embodiment, the through hole 6h and the notch 6g), and the bearing 5H are aligned in a direction intersecting the axial direction of the motor axis J1. Therefore, when the first housing internal flow path 94 is arranged parallel to the motor axis J1, the fluid O can be directly supplied from the first housing internal flow path 94 to the bearing 5H, allowing the bearing 5H to be efficiently lubricated.

[0097] As shown in Fig. 4, the first housing flow path 94 is disposed between the motor axis J1 and the output axis J3, which are parallel to each other, in the vehicle longitudinal direction (X-axis direction). That is, the first housing flow path 94 is disposed between the motor axis J1 and the output axis J3 when viewed from the top-bottom direction. According to this embodiment, the first housing flow path 94 can be disposed between the motor 2 and the bearing 5H in the vehicle longitudinal direction, thereby being close to both the motor 2 and the bearing 5H. As a result, the fluid O can be efficiently supplied from the first housing flow path 94 to the motor 2 and the bearing 5H.

[0098] As shown in FIG. 4, when viewed in the axial direction of the motor axis J1, a first common tangent L1 and a second common tangent L2 are assumed to contact the outer contour of the motor 2 and the outer contour of the bearing 5H, respectively. In this embodiment, the first common tangent L1 and the second common tangent L2 each contact a different fixed portion 32a of the stator core 32. The first housing flow path 94 is preferably disposed in an area surrounded by the motor 2, the bearing 5H, the first common tangent L1, and the second common tangent L2. This allows the first housing flow path 94 to be located close to both the motor 2 and the bearing 5H, allowing the fluid O to be efficiently supplied from the first housing flow path 94 to the motor 2 and the bearing 5H.

[0099] In the present embodiment, the second supply holes 94b, the through holes 6h, the cutouts 6g, and the bearings 5H are aligned linearly in the radial direction of the output axis J3. However, as shown in a modified driving device 1A in FIG. 5, the second supply holes 94b, the through holes 6h, the cutouts 6g, and the bearings 5H may be aligned linearly inclined toward the axial direction as they extend radially outward. Even in this case, the fluid O can be supplied to the bearing 5H by providing the second supply holes 94b so that the ejection direction of the fluid O faces the bearing 5H.

[0100] (Second side wall flow passage) As shown in FIG. 1 , the second sidewall flow passage 95 connects to the first housing flow passage 94. The second sidewall flow passage 95 is provided within the wall of the second sidewall portion 6b. The second sidewall flow passage 95 extends along a plane perpendicular to the motor axis J1. The second sidewall flow passage 95 connects to the first housing flow passage 94 at its upstream end. The second sidewall flow passage 95 connects to the second housing flow passage 96 and the third housing flow passage 98 at its downstream end. The second sidewall flow passage 95 connects the first housing flow passage 94 with the second housing flow passage 96 and the third housing flow passage 98.

[0101] The second sidewall inner flow path 95 has a supply portion 95a that connects to the inside of the bearing holder 60F. The supply portion 95a supplies the fluid O flowing through the second sidewall inner flow path 95 to the inside of the bearing holder 60F, thereby lubricating the bearing 5F held in the bearing holder 60F. According to this embodiment, the bearing 5F can be lubricated without providing a reservoir or the like inside the gear accommodating portion 82 for supplying fluid to the bearing 5F.

[0102] Fig. 6 is a front view of the housing main body 6B seen from the side of the gear accommodating portion 82. Fig. 7 is a cross-sectional view of the housing main body 6B taken along line VII-VII in Fig. 6. 6, the second side-wall internal flow passage 95 overlaps with the bearing holder 60F when viewed in the axial direction of the motor axis J1. The supply portion 95a is a hole that connects the second side-wall internal flow passage 95 to the bearing holder 60F. The supply portion 95a extends from the second side-wall internal flow passage 95 to the other axial side (-Y side). The supply portion 95a is located in a region where the second side-wall internal flow passage 95 and the bearing holder 60F overlap when viewed in the axial direction.

[0103] According to this embodiment, the second sidewall internal flow path 95 and the bearing holder 60F overlap when viewed in the axial direction. This allows the flow path of the supply portion 95a connecting the second sidewall internal flow path 95 and the bearing holder 60F to be shortened. This not only reduces pressure loss within the supply portion 95a, but also suppresses a decrease in strength of the second sidewall portion 6b due to the provision of the supply portion 95a.

[0104] A recessed groove 6m is provided in the first gear facing surface 6p of the second side wall portion 6b. The recessed groove 6m connects the bearing holder 60F, which is centered on the intermediate axis J2, to the shaft passing hole 6s, which is centered on the motor axis J1. In this embodiment, the intermediate axis J2 is located above the motor axis J1. Therefore, the second side wall inner flow passage 95 can be easily passed through the bearing holder 60F. supply The fluid O is supplied to the shaft passing hole 6s through the recessed groove 6m, thereby lubricating the bearings 5B and 5C arranged inside the shaft passing hole 6s.

[0105] 7, the downstream end of the second side-wall flow path 95 is connected to a second-housing flow path 96 and a third-housing flow path 98. The second-housing flow path 96 is disposed in the internal space of the motor accommodating portion 81, which extends to one axial side (+Y side) of the second side wall portion 6b. On the other hand, the third-housing flow path 98 is disposed in the internal space of the gear accommodating portion 82, which extends to the other axial side (-Y side) of the second side wall portion 6b. Therefore, the second-housing flow path 96 and the third-housing flow path 98 extend on opposite sides of the second side-wall flow path 95 in the axial direction.

[0106] A first insertion hole 95p that opens to one axial side (+Y side) and a second insertion hole 95q that opens to the other axial side (-Y side) are provided at the downstream end of the second side-wall inner flow passage 95. The first insertion hole 95p and the second insertion hole 95q overlap each other when viewed in the axial direction of the motor axis J1. The first insertion hole 95p and the second insertion hole 95q are arranged coaxially.

[0107] A pipe constituting the second housing flow path 96 is inserted into the first insertion hole 95p, and a pipe constituting the third housing flow path 98 is inserted into the second insertion hole 95q. The cross-sectional area of ​​the first insertion hole 95p is generally uniform. On the other hand, the second insertion hole 95q is provided with a reduced diameter portion 95r where the cross-sectional area is partially narrowed.

[0108] A first boundary 95b is provided in the first insertion hole 95p of the second side-wall flow path 95. The first boundary 95b is an axially extending region located between the tip of the second-housing flow path 96 inserted into the first insertion hole 95p and a portion of the second-side-wall flow path 95 extending perpendicular to the axial direction. Similarly, a second boundary 95c is provided in the second insertion hole 95q of the second side-wall flow path 95. The second boundary 95c is an axially extending region located between the tip of the third-housing flow path 98 inserted into the second insertion hole 95q and a portion of the second-side-wall flow path 95 extending perpendicular to the axial direction. That is, the second side-wall flow path 95 has the first boundary 95b at the boundary with the second-housing flow path 96 and the second boundary 95c at the boundary with the third-housing flow path 98. Further, a reduced diameter portion 95r is provided at the second boundary portion 95c.

[0109] According to this embodiment, the cross-sectional area of ​​the first boundary 95b is larger than the cross-sectional area of ​​the second boundary 95c. Therefore, more of the fluid O flowing through the second side-wall passage 95 flows into the second-housing passage 96 than into the third-housing passage 98. As will be described later, the fluid O supplied to the second-housing passage 96 is supplied mainly to the motor 2 to cool it. On the other hand, the fluid O supplied to the third-housing passage 98 is supplied mainly to the transmission mechanism 3 to lubricate it. According to this embodiment, when cooling the motor 2 takes priority over lubrication of the transmission mechanism 3, it is possible to supply more fluid O to the motor 2 than to the transmission mechanism 3.

[0110] According to this embodiment, the first boundary 95b and the second boundary 95c overlap each other when viewed in the axial direction of the motor axis J1. Therefore, the second housing internal flow path 96 and the third housing internal flow path 98 can be disposed in the same position when viewed in the axial direction, thereby reducing the axial projection area of ​​the housing 6. According to this embodiment, the drive unit 1 can be made more compact.

[0111] (Second housing internal flow path) As shown in FIG. 1, the second housing internal flow path 96 is connected to the second side wall internal flow path 95. The second housing internal flow path 96 extends axially inside the motor accommodating portion 81. An end portion on one axial side (+Y side) of the second housing internal flow path 96 is fixed to the inner surface of the housing 6. Meanwhile, an end portion on the other axial side (-Y side) of the second housing internal flow path 96 is inserted into an opening of the second side wall internal flow path 95 provided in the second side wall portion 6b. The fluid O in the second housing internal flow path 96 flows from the other axial side (-Y side) to one side (+Y side)

[0112] A gap is provided between the end of the second housing internal flow path 96 on one axial side (+Y side) and the first side wall 6a. A stepped surface 81e facing the one axial side (+Y side) is provided on the inner surface of the motor peripheral wall 6d. The second housing internal flow path 96 is fixed to the stepped surface 81e from the one axial side (+Y side) by screws at a mounting portion 81f at the end on the one axial side (+Y side). The second housing internal flow path 96 of this embodiment can be fixed to the housing main body 6B with the motor cover 6A open. According to this embodiment, the second housing internal flow path 96 can be assembled more easily than when both ends of the second housing internal flow path 96 are fixed to the first side wall 6a and the second side wall 6b, respectively.

[0113] The second housing flow path 96 is provided with a third supply hole (supply hole) 96a that supplies the fluid O to the motor 2. The third supply hole 96a is a hole that penetrates in the thickness direction of the pipe that constitutes the second housing flow path 96. The third supply hole 96a ejects the fluid O toward the motor 2 due to the pressure within the second housing flow path 96.

[0114] 4, the second housing internal flow path 96 is disposed on the side of the stator core 32. In this embodiment, the second housing internal flow path 96 is disposed directly above the stator core 32. In this specification, "directly above" means disposed above and overlapping when viewed in the vertical direction.

[0115] As described above, the stator core 32 has the fixed portion 32a that protrudes radially outward. In this embodiment, the radial position of the second housing internal flow path 96 overlaps with the radial position of the fixed portion 32a. According to this embodiment, the second housing internal flow path 96 can be disposed close to the outer circumferential surface of the stator core 32, and the fluid O can be efficiently supplied to the stator 30 from the third supply holes 96a.

[0116] According to this embodiment, the fluid O is supplied to the outer peripheral surface of the motor 2 from the first supply hole 94a of the first housing flow path 94 and the third supply hole 96a of the second housing flow path 96. This allows the fluid O to be supplied to the entire outer peripheral surface of the motor 2, and prevents localized high-temperature areas from being formed on the surface of the motor 2.

[0117] In this embodiment, the first housing flow passage 94 and the second housing flow passage 96 are disposed on both circumferential sides of one fixed portion 32a and extend parallel to each other along the axial direction of the motor axis J1. According to this embodiment, the fluid O can be supplied from the first housing flow passage 94 and the second housing flow passage 96 to the outer circumferential surface of the stator core 32 on both sides of one fixed portion 32a, respectively.

[0118] According to the present embodiment, the flow path (first sidewall flow path 93) that supplies the fluid O to the first housing flow path 94 and the flow path (second sidewall flow path 95) that supplies the fluid O to the second housing flow path 96 are provided in side walls (first sidewall 6a and second sidewall 6b) that are arranged on opposite sides of each other in the axial direction. Therefore, the fluid O flows in opposite directions in the first housing flow path 94 and the second housing flow path 96.

[0119] When two housing internal flow paths are connected to a sidewall internal flow path on one axial side of the motor, the sidewall internal flow path tends to be long and complex. According to this embodiment, the first housing internal flow path 94 is connected to the first sidewall internal flow path 93 on one axial side (+Y side) of the motor 2, and the second housing internal flow path 96 is connected to the second sidewall internal flow path 95 on the other axial side (-Y side) of the motor 2. This allows each sidewall internal flow path (the first sidewall internal flow path 93 and the second sidewall internal flow path 95) to be short and simple. As a result, a decrease in the strength and rigidity of the first sidewall 6a and the second sidewall 6b can be suppressed. Additionally, compared to a case in which complex sidewall internal flow paths are concentrated on either the first sidewall 6a or the second sidewall 6b, restrictions on the placement of other components attached to the first sidewall 6a and the second sidewall 6b can be suppressed.

[0120] (3rd housing internal flow path) As shown in FIG. 1, the third housing internal flow path 98 is connected to the second side wall internal flow path 95. The third housing internal flow path 98 extends along the axial direction inside the gear accommodating portion 82. The fluid O in the third housing internal flow path 98 flows from one axial side (+Y side) to the other axial side (-Y side). The end of the third housing internal flow path 98 on the one axial side (+Y side) is inserted into the opening of the second side wall internal flow path 95 provided in the second side wall portion 6b.

[0121] The third housing flow path 98 is provided with a fourth supply hole (supply hole) 98a that supplies the fluid O to the transmission mechanism 3. The fourth supply hole 98a is a hole that penetrates in the thickness direction of the pipe that constitutes the third housing flow path 98. The fourth supply hole 98a ejects the fluid O toward the transmission mechanism 3 by the pressure inside the third housing flow path 98. According to this embodiment, the fluid O can be supplied from the flow path 90 to the transmission mechanism 3 to lubricate the transmission mechanism 3 without providing a configuration for supplying the fluid O, such as a reservoir, inside the gear accommodating portion 82.

[0122] In this embodiment, the opening of the fourth supply hole 98a faces the first gear 41 or the second gear. Therefore, the fluid O ejected from the fourth supply hole 98a is supplied to the first gear 41 or the second gear 42. In this embodiment, the first gear 41 and the second gear mesh with each other. Therefore, by supplying fluid O from the fourth supply hole 98a to either the first gear 41 or the second gear 42, the tooth surfaces of both gears can be lubricated with the fluid O. Also, as in this embodiment, the transmission mechanism 3 is provided with a ring gear 51 that rotates about the output axis J3. The ring gear 51 generally has a larger diameter than the other gears and is therefore more likely to be immersed in the fluid reservoir P. Therefore, it is not necessarily necessary to supply fluid O to the ring gear 51 and the third gear 43 that meshes with the ring gear 51. As in this embodiment, if the fluid O is supplied to the first gear 41 or the second gear 42, all gears of the transmission mechanism 3 can be kept lubricated, and the operation of the transmission mechanism 3 can be made smooth.

[0123] (3rd side wall internal flow passage) As shown in FIG. 1 , the third side-wall internal flow passage 99 is connected to the third housing internal flow passage 98. The third side-wall internal flow passage 99 is provided within the wall of the third side wall portion 6c. The third side-wall internal flow passage 99 extends along a plane perpendicular to the motor axis J1. The third side-wall internal flow passage 99 has a first flow passage portion 99A and a second flow passage portion 99B. The first flow passage portion 99A is an upstream region of the third side-wall internal flow passage 99, and the second flow passage portion 99B is a downstream region of the third side-wall internal flow passage 99.

[0124] The first flow path portion 99A is connected at its upstream end to the third housing internal flow path 98. The first flow path portion 99A is connected at its downstream end to the interior of the bearing holder 60E. The second flow path portion 99B is connected at its upstream end to the interior of the bearing holder 60E. The second flow path portion 99B is connected at its downstream end to the interior of the bearing holder 60A.

[0125] 3, the first flow path portion 99A is a recessed groove provided in the second gear opposing surface 6q of the third side wall portion 6c that faces the transmission mechanism 3. The fluid O discharged from the end of the third in-housing flow path 98 flows into the first flow path portion 99A. The fluid O in the first flow path portion 99A flows into the bearing holder 60E due to gravity.

[0126] 1, the hollow portion of the second shaft 45 opens into the interior of the bearing holder 60E. The fluid O flowing from the first flow path portion 99A of the third intra-side-wall flow path 99 into the interior of the bearing holder 60E lubricates the bearing 5E held in the bearing holder 60E, and also flows into the interior of the second shaft 45 and the second flow path portion 99B. A portion of the fluid O flowing into the interior of the second shaft 45 reaches one axial side (+Y side) of the second shaft 45 and lubricates the bearing 5F.

[0127] As shown in Fig. 3, the second flow path portion 99B is a through-hole that penetrates a cylindrical portion of the bearing holder 60E centered on the intermediate axis J2 and a cylindrical portion of the bearing holder 60A centered on the motor axis J1. The second flow path portion 99B extends in the vertical direction. In this embodiment, the intermediate axis J2 is located above the motor axis J1. Therefore, a portion of the fluid O inside the bearing holder 60E flows through the second flow path portion 99B due to gravity and into the bearing holder 60A.

[0128] 1, the hollow portion of the first shaft 21B opens into the interior of the bearing holder 60A. The fluid O that flows from the second flow path portion 99B of the third sidewall internal flow path 99 into the interior of the bearing holder 60A lubricates the bearing 5A held in the bearing holder 60A and also flows into the interior of the first shaft 21B. Therefore, the downstream end of the third sidewall internal flow path 99 is connected to the second shaft internal flow path 97B.

[0129] According to this embodiment, the third sidewall inner flow path 99 supplies the fluid O to the bearings 5A, 5E held in the third sidewall portion 6c. According to this embodiment, the bearings 5A, 5E can be lubricated without providing a reservoir or the like inside the gear accommodating portion 82 for supplying the fluid to the bearings 5A, 5E.

[0130] (First shaft internal flow path) The first shaft internal flow path 97A is connected to the first side-wall internal flow path 93 and is provided in the hollow portion of the motor shaft 21A. That is, the first shaft internal flow path 97A is a path for the fluid O that passes through the hollow portion of the motor shaft 21A. In the first shaft internal flow path 97A, the fluid O flows from one axial side (+Y side) to the other axial side (-Y side).

[0131] The motor shaft 21A is provided with a communication hole 21p that extends radially and provides communication between the inside and outside of the motor shaft 21A. Fluid O in the first shaft internal flow path 97A passes through the communication hole 21p and is scattered radially outward by centrifugal force caused by the rotation of the motor shaft 21A, and is then supplied to the stator 30.

[0132] In this embodiment, the shaft connecting member constituting the first shaft flow path 97A extends between the first sidewall 6a and the third sidewall 6c. Therefore, to supply fluid O to the first shaft flow path 97A, it is necessary to send fluid O into the shaft from either the first sidewall 6a or the third sidewall 6c. The flow path 90 of this embodiment supplies fluid O to the first shaft flow path 97A from the first sidewall 6a on one axial side (+Y side) of the motor 2. Therefore, compared to supplying fluid O to the first shaft flow path 97A from the third sidewall 6c, it is easier to shorten the distance between the pump 8 disposed on the outer periphery of the motor housing 81 and the first shaft flow path 97A. As a result, the pipeline resistance of the flow path connecting the pump 8 and the first shaft flow path 97A is reduced, allowing a larger amount of fluid O to be supplied to the first shaft flow path 97A.

[0133] As shown in FIG. 4, when viewed in the axial direction of the motor axis J1, the first housing internal flow path 94 and First shaft flow passage 97A The distance D1 between the first housing flow path 94 and Second housing internal flow path 96 The distance D2 is shorter than the distance D2 between the first shaft flow path 97A and the first housing flow path 94. According to this embodiment, the first shaft flow path 97A is relatively close to the first housing flow path 94. Therefore, even if the first housing flow path 94 and the first shaft flow path 97A are connected by the first side wall flow path 93, problems such as the first side wall flow path 93 becoming long and complicated are unlikely to occur.

[0134] (Second shaft internal flow path) 1, the second shaft internal flow path 97B is connected to the third sidewall internal flow path 99 and is provided in the hollow portion of the first shaft 21B. That is, the second shaft internal flow path 97B is a path for the fluid O passing through the hollow portion of the first shaft 21B. In the second shaft internal flow path 97B, the fluid O flows from the other axial side (-Y side) to one side (+Y side).

[0135] The fluid O flowing through the second shaft internal flow path 97B merges with the fluid flowing through the first shaft internal flow path 97A. The merged fluid O leaks out from the connection between the motor shaft 21A and the first shaft 21B and is supplied to the bearings 5B and 5C held in the second side wall portion 6b, lubricating the bearings 5B and 5C.

[0136] (flow path components) FIG. 8 is a perspective view of the flow path member 4 of this embodiment. The flow path member 4 has a first housing internal flow path 94, a pipe portion 92a, a connecting portion 4a that connects the first housing internal flow path 94 and the pipe portion 92a, and a plurality of ribs 4b that reinforce the connecting portion 4a.

[0137] According to the present embodiment, the pipe portion 92a, which relays between the pump 8 and the first housing internal flow path 94, is connected to the first housing internal flow path 94. This simplifies the assembly process compared to when the first housing internal flow path 94 and the pipe portion 92a are separately assembled to the housing 6. In particular, in the present embodiment, the first housing internal flow path 94 and the pipe portion 92a are configured from a single member (flow path member 4), which reduces the number of parts and thus the cost.

[0138] According to this embodiment, the pipe portion 92a and the first housing internal flow path 94 extend parallel to each other. Furthermore, the connecting portion 4a of this embodiment is plate-shaped and extends in the same direction as the pipe portion 92a and the first housing internal flow path 94. A through hole 4h is provided in the connecting portion 4a. The through hole 4h penetrates the connecting portion 4a in the thickness direction.

[0139] The flow path member 4 is disposed along the outer peripheral surface of the motor 2. The motor 2 is supplied with fluid O from the supply holes (first supply hole 94a, third supply hole 96a) of the first housing flow path 94 and the second housing flow path 96. Therefore, the flow path member 4 is exposed to fluid O that bounces off the outer peripheral surface of the motor 2. According to this embodiment, the connecting portion 4a is provided with a through hole 4h, which allows the fluid O that has splashed on the connecting portion 4a to drip downward, thereby preventing the fluid O from accumulating above the connecting portion 4a.

[0140] In this embodiment, the rib 4b is plate-shaped and extends along a plane perpendicular to the extension direction of the pipe portion 92a and the first housing internal flow path 94. The multiple ribs 4b are arranged at equal intervals along the extension direction of the pipe portion 92a and the first housing internal flow path 94. Each rib 4b is connected to the outer periphery of the pipe portion 92a, the outer periphery of the first housing internal flow path 94, and the connecting portion 4a.

[0141] The flow path member 4 is provided with a recess 4c surrounded by the pipe portion 92a, the first housing internal flow path 94, the connecting portion 4a, and the rib 4b. The flow path member 4 of this embodiment is provided with three recesses 4c. The fluid O that splashes into the flow path member 4 is likely to accumulate in the three recesses 4c. The through holes 4h of this embodiment are arranged in the connecting portions 4a that form the respective recesses 4c. For this reason, the through holes 4h are Recess 4c The through-holes 4h can discharge the fluid O that accumulates in the recesses 4c. If the through-holes 4h are arranged on any of the surfaces that constitute the recesses 4c, the fluid O that accumulates in the recesses 4c can be discharged. Therefore, it is sufficient that the through-holes 4h are provided on at least one of the connecting portions 4a and the ribs 4b.

[0142] 4, when viewed from the direction in which the pipe portion 92a and the first housing internal flow path 94 extend (in the axial direction of the motor axis J1 in this embodiment), the first housing internal flow path 94 is disposed below the pipe portion 92a. By disposing either the pipe portion 92a or the first housing internal flow path below the other in this manner, the flow path member 4 can be disposed at an angle, and the fluid O splashing toward the flow path member 4 can be prevented from accumulating in the flow path member 4.

[0143] In the present embodiment, the first housing flow path 94 is disposed above the motor axis J1 and the output axis J3. As described above, the first housing flow path 94 supplies fluid O to the motor 2 disposed around the motor axis J1 and the bearing 5H disposed around the output axis J3. According to the present embodiment, since the first housing flow path 94 is disposed above the motor axis J1 and the output axis J3, gravity can be used to supply fluid O to the motor 2 and the bearing 5H. Furthermore, in the present embodiment, the first housing flow path 94 is disposed below the pipe portion 92a. According to the present embodiment, by using the pipe disposed on the lower side of the pipe portion 92a and the first housing flow path 94 as the first housing flow path 94, the first housing flow path 94 can be disposed close to the motor 2 and the bearing 5H, thereby efficiently supplying fluid O.

[0144] In this embodiment, the distance between the first housing internal flow path 94 and the motor axis J1 is shorter than the distance between the pipe portion 92a and the motor axis J1. In this manner, by arranging the pipe portion 92a and the first housing internal flow path 94, which supplies the fluid O to the motor 2, close to the motor axis J1, the fluid O can be efficiently supplied to the motor 2.

[0145] 1, in this embodiment, the flow direction of the fluid O flowing through the pipe portion 92a is opposite to the flow direction of the fluid O flowing through the first housing internal flow path 94. According to this embodiment, the fluid O can be supplied to the first housing internal flow path 94 using the pipe portion 92a.

[0146] In the present embodiment, the ribs 4b extend along a plane perpendicular to the extension direction of the pipe portion 92a and the first housing internal flow path 94. However, the configuration of the ribs 4b is not limited to this embodiment. As shown in a modified flow path member 104 in FIG. 9, the ribs 104b may extend in the same direction as the extension direction of the pipe portion 92a and the first housing internal flow path 94.

[0147] <Refrigerant flow path> 1 is a flow path through which a refrigerant L flows. The refrigerant L flowing through the refrigerant flow path 70 is, for example, water. The refrigerant flow path 70 is provided in the housing 6. The refrigerant flow path 70 has an external refrigerant pipe 71 passing through the outside of the housing 6 and an internal refrigerant flow path 72 passing through the inside of the housing 6. In addition, an inverter 7 and a cooler 9 are arranged in the path of the refrigerant flow path 70.

[0148] The external refrigerant piping 71 is a pipe connected to the housing 6. In this embodiment, the external refrigerant piping 71 is connected to the inverter accommodating portion 89 and a side portion of the motor accommodating portion 81. The internal refrigerant flow path 72 is a hole extending inside the housing 6. The internal refrigerant flow path 72 connects the external refrigerant piping 71 and the cooler 9. A radiator (not shown) is disposed in the path of the external refrigerant piping 71. The radiator cools the refrigerant L flowing through the refrigerant flow path 70.

[0149] The refrigerant flow path 70 runs from a radiator (not shown), passes through the inverter 7 and the cooler 9 in this order, and returns to the radiator. In the cooler 9, the refrigerant L exchanges heat with the fluid O flowing through the flow path 90 to cool the fluid O. The refrigerant L also cools the inverter 7 as it passes through the inverter 7.

[0150] In this embodiment, a case will be described in which oil is used as the fluid O and cooling water is used as the refrigerant L, but the present invention is not limited to this. For example, both the fluid O and the refrigerant L may be oil. Even in this case, it is sufficient that the flow path 90 and the refrigerant flow path 70 are provided as paths independent of each other, and the oils flowing therethrough do not mix with each other.

[0151] <Modification> Next, various modifications that can be adopted in the above-described embodiment will be described. In the following description of each modification, the same components as those in the already described embodiment and modification will be assigned the same reference numerals, and the description thereof will be omitted.

[0152] (Variation 1) FIG. 10 is a schematic cross-sectional view of a driving device 101 according to the first modification. The driving device 101 of this modified example differs from the above-described embodiment mainly in the configurations of the first sidewall internal flow path 193, the first housing internal flow path 194, and the second sidewall internal flow path 195.

[0153] Similar to the above-described embodiment, the housing 106 of this modified example has a motor accommodating portion 181 and a gear accommodating portion 182. The gear accommodating portion 182 is provided with a fluid reservoir P that stores fluid O. The housing 106 of this modified example also has a first side wall portion 106a, a second side wall portion 106b, and a third side wall portion 106c that extend along a plane perpendicular to the motor axis J1.

[0154] In this modification, first side wall portion 106a is located on the other axial side (-Y side) of motor 2, and separates the internal space of motor accommodating portion 181 from the internal space of gear accommodating portion 182. Second side wall portion 106b is located on one axial side (+Y side) of motor 2. Third side wall portion 106c is disposed on the other axial side (-Y side) of transmission mechanism 3.

[0155] Flow path 190 of this modified example includes suction flow path 191, discharge flow path 192, first sidewall flow path 193, first housing flow path 194, second sidewall flow path 195, second housing flow path 196, first shaft flow path 197A, and third housing flow path 198. Flow path 190 of this modified example may further include third sidewall flow path 99 and second shaft flow path 97B similar to the above-described embodiment. In this case, third sidewall flow path 99 is connected to third housing flow path 198, and second shaft flow path 97B is connected to third sidewall flow path 99.

[0156] The intake flow path 191 connects the fluid reservoir P and the pump 8. The discharge flow path 192 extends from the pump 8 to the first side wall portion 106a. The discharge flow path 192 connects the pump 8 and a first side wall inner flow path 193. The first side wall inner flow path 193 First housing internal flow path 194 and is provided inside the wall of the first side wall portion 106a.

[0157] The first housing internal flow path 194 extends along the axial direction inside the motor accommodating portion 181. The fluid O in the first housing internal flow path 194 flows from the other axial side (-Y side) to one side (+Y side).

[0158] The third housing internal flow path 198 is connected to the first sidewall internal flow path 193 and extends along the axial direction inside the gear accommodating portion 182. The fluid O in the third housing internal flow path 198 flows from one axial side (+Y side) to the other axial side (-Y side).

[0159] The second sidewall flow passage 195 is connected to the first housing flow passage 194 and is provided within the wall of the second sidewall portion 106b.

[0160] The first shaft inner flow passage 197A is connected to the second sidewall inner flow passage 195 and is provided in the hollow portion of the motor shaft 21A.

[0161] The second housing internal flow path 196 is connected to the second side wall internal flow path 195, and extends along the axial direction inside the motor accommodating portion 181. The fluid O in the second housing internal flow path 196 flows from one axial side (+Y side) to the other axial side (-Y side).

[0162] According to this modification, the side wall portion (first side wall portion 106a) that supplies fluid O to the first housing internal flow path 194 and the side wall portion (second side wall portion 106b) that supplies fluid O to the second housing internal flow path 196 are arranged on opposite sides in the axial direction across the motor 2. Therefore, compared to a case in which fluid O is supplied from a single side wall internal flow path to the first housing internal flow path 194 and the second housing internal flow path 196, each of the side wall internal flow paths 193, 195 can be made shorter and simpler, and a decrease in the strength and rigidity of the first side wall portion 106a and the second side wall portion 106b can be suppressed. In addition, compared to a case in which a complex side wall internal flow path is arranged in either the first side wall portion 106a or the second side wall portion 106b, restrictions on the arrangement of other components attached to the first side wall portion 106a and the second side wall portion 106b can be suppressed.

[0163] (Variation 2) FIG. 11 is a cross-sectional view of a driving device 201 according to the second modification. The driving device 201 of this modified example differs from the above-described embodiment mainly in the configuration of the first housing internal flow path 294.

[0164] Similar to the above-described embodiment, the housing 206 of this modified example has a motor accommodating portion 281 and a gear accommodating portion 282. The housing 206 of this modified example also has a side wall portion 206b that separates the internal space of the motor accommodating portion 281 from the internal space of the gear accommodating portion 282.

[0165] The side wall portion 206b is provided with a first gear opposing surface (gear opposing surface) 206p that faces the transmission mechanism 3 (omitted in FIG. 11). A bearing holder 60H that supports the differential case shaft 50a of the transmission mechanism 3 via a bearing 5H is provided on the first gear opposing surface 206p.

[0166] The bearing holder 60H has a cylindrical portion 206f that protrudes from the first gear-opposing surface 206p and surrounds the bearing 5H. The side wall portion 206b has a bottom region 206s that is surrounded by the cylindrical portion 206f. A through hole (opening) 206h that penetrates the side wall portion 206b in the thickness direction is provided in the bottom region 206s. When viewed in the axial direction of the output axis J3, the through hole 206h overlaps the bearing 5H. Therefore, the through hole 206h exposes the bearing 5H to the internal space of the motor accommodating portion 281. The second supply hole 294b of the first internal housing flow path 294 opens toward the through hole 206h and the bearing 5H.

[0167] The flow path 290 of this modification is provided inside the motor housing portion 281. Extend The first housing internal flow path 294 extends along a plane perpendicular to the motor axis J1. The first housing internal flow path 294 is provided with a first supply hole 294a and a second supply hole 294b. The first supply hole 294a supplies fluid O to the motor 2. Meanwhile, the second supply hole 294b supplies fluid O to the bearing 5H.

[0168] The fluid O ejected from the second supply hole 294b passes through the through hole 206h and is supplied to the bearing 5H. As a result, the fluid O lubricates the bearing 5H. According to this modification, the fluid O is supplied from the pipe-shaped first inner-housing flow path 294 disposed inside the motor accommodating portion 281 to the inside of the gear accommodating portion 282. Distributed to The bearing 5H placed therein can be lubricated.

[0169] In this modified example, a case has been described in which through-holes 206h are provided in the bottom region 206s as openings through which the fluid O from the second supply holes 294b passes. Even with this configuration, the fluid O ejected from the second supply holes 294b can be supplied to the bearing 5H, as in the above-described embodiment.

[0170] Although various embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in each embodiment and modification are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments. [Explanation of symbols]

[0171] DESCRIPTION OF SYMBOLS 1, 1A, 101, 201... Drive device, 2... Motor, 3... Transmission mechanism, 4, 104... Flow path member, 4a... Connection portion, 4b, 104b... Rib, 4c... Recess, 4h, 6h, 206h... Through hole, 5A... Bearing (second bearing), 5B, 5C, 5D, 5E, 5G, 5H... Bearing, 5F... Bearing (first bearing), 6, 106, 206... Housing, 6a, 106a... First side wall portion, 6b, 106b, 206b... Second side wall portion (side wall portion), 6c, 106c... Third side wall portion, 6d... Motor peripheral wall portion, 6f, 6t, 206f ...Cylindrical portion, 6g...Notched portion (opening), 6h, 206h...Through hole (opening), 6k...Vertical wall region, 6p, 206p...First gear opposing surface (gear opposing surface), 8...Pump, 20...Rotor, 21A...Motor shaft, 21B...First shaft (shaft), 30...Stator, 31...Coil, 32...Stator core, 32a...Fixed portion, 41...First gear (gear), 42...Second gear (gear), 43...Third gear (gear), 45...Second shaft (shaft), 50a...Differential case shaft (shaft), 51...Ring gear (gear), 60A...B Bearing holder (second bearing holder), 60D, 60E, 60G, 60H... bearing holder, 60F... bearing holder (first bearing holder), 81, 181, 281... motor accommodating section, 82, 182, 282... gear accommodating section, 90, 190, 290... flow passage, 91, 191... intake passage, 92, 192... discharge passage, 92a... pipe section, 92b... first hole section (hole section), 92c... second hole section (hole section), 93, 193... first side wall inner passage, 94, 194, 294... first housing inner passage (housing inner passage), 94a... First supply hole (supply hole), 94b...second supply hole (supply hole), 95, 195...second side wall internal passage, 95a...supply portion, 95b...first boundary portion, 95c...second boundary portion, 96, 196...second housing internal passage, 96a...third supply hole (supply hole), 97A, 197A...first shaft internal passage, 97B...second shaft internal passage, 98, 198...third housing internal passage, 98a...fourth supply hole (supply hole), 99...third side wall internal passage, 206s...bottom area, D1, D2...distance, H1, H2...opening area, J1...motor axis, O...fluid, P...fluid reservoir

Claims

1. a motor having a rotor that rotates about a motor axis and a stator that surrounds the rotor; a housing having a motor accommodating portion for accommodating the motor; a fluid contained within the housing; a flow path through which the fluid flows, The housing includes: a first sidewall portion located on one axial side of the motor and extending along a plane perpendicular to the motor axis; a second side wall portion located on the other axial side of the motor and extending along a plane perpendicular to the motor axis; a motor peripheral wall portion surrounding an outer periphery of the motor, The flow path is a first sidewall flow path provided within the first sidewall portion; a first housing flow path that is connected to the first sidewall flow path and extends inside the motor accommodating portion along the axial direction; a second sidewall flow path connected to the first housing flow path and provided within the second sidewall portion; a second housing flow path that is connected to the second sidewall flow path and extends inside the motor accommodating portion along the axial direction, The first housing internal flow path and the second housing internal flow path are provided with supply holes for supplying the fluid to the motor. Drive unit.

2. the stator has an annular stator core centered on the motor axis, the stator core has a fixing portion that protrudes radially outward and is fixed to the housing, The first housing internal flow path and the second housing internal flow path extend in parallel along the axial direction of the motor axis, with the fixed portion sandwiched between them. The drive device according to claim 1 .

3. the rotor has a hollow motor shaft centered on the motor axis, the flow path includes a first inner-shaft flow path that is connected to the first inner-side-wall flow path and is provided in a hollow portion of the motor shaft.

3. The drive device according to claim 1 or 2.

4. When viewed in the axial direction of the motor axis, the distance between the first housing internal flow path and the first shaft internal flow path is shorter than the distance between the first housing internal flow path and the second housing internal flow path. The drive device according to claim 3 .

5. a transmission mechanism having a plurality of gears and transmitting power from the motor; a pump that pumps the fluid in the flow path, the housing has a gear accommodating portion that is located on the other axial side of the motor accommodating portion, has a fluid reservoir that accumulates the fluid, and accommodates the transmission mechanism; the second side wall portion partitions an internal space of the motor accommodating portion from an internal space of the gear accommodating portion, The flow path is an intake flow path connecting the fluid reservoir and the pump; The drive device according to claim 1 , further comprising: a discharge flow path connecting the pump and the first sidewall internal flow path.

6. The discharge flow path is a hole provided in a wall of the housing; The drive device according to claim 5 , further comprising a pipe portion connecting an opening of the hole portion and the first sidewall internal flow path.

7. a first bearing holder that supports a shaft of the transmission mechanism via a first bearing is provided on the second side wall portion; The drive device according to claim 5 or 6, wherein the second sidewall inner flow passage has a supply portion that is connected to the inside of the first bearing holder.

8. the second sidewall inner flow passage overlaps the first bearing holder when viewed in the axial direction of the motor axis, the supply portion is located in a region where the second sidewall inner flow path and the first bearing holder overlap when viewed in the axial direction. The drive device according to claim 7.

9. the flow path includes a third housing flow path that is connected to the second sidewall flow path and extends inside the gear accommodating portion along the axial direction, a supply hole that supplies the fluid to the transmission mechanism is provided in the third housing flow path; The drive device according to any one of claims 5 to 8.

10. The transmission mechanism includes: a first shaft extending along the axial direction around the motor axis and connected to the rotor from the other axial side; a first gear provided on an outer circumferential surface of the first shaft; a second gear that meshes with the first gear, an opening of the supply hole of the third housing flow path faces the first gear or the second gear; The drive device according to claim 9.

11. The second sidewall inner flow path is a first boundary portion at a boundary portion with the second housing internal flow path; a second boundary portion at a boundary portion with the third housing internal flow path, The drive device according to claim 9 or 10, wherein a cross-sectional area of ​​the first boundary portion is larger than a cross-sectional area of ​​the second boundary portion.

12. The second sidewall inner flow path is a first boundary portion at a boundary portion with the second housing internal flow path; a second boundary portion at a boundary portion with the third housing internal flow path, When viewed in the axial direction of the motor axis, the first boundary portion and the second boundary portion overlap each other. The drive device according to any one of claims 9 to 11.

13. the housing has a third side wall portion located on the other axial side of the transmission mechanism and extending along a plane perpendicular to the motor axis, a second bearing holder that supports a shaft of the transmission mechanism via a second bearing is provided on the third side wall portion; the flow path includes a third sidewall flow path that is connected to the third housing flow path and is provided within the wall of the third sidewall portion, The drive device according to any one of claims 9 to 12, wherein the third sidewall inner flow passage is connected to an interior of the second bearing holder.

14. the transmission mechanism includes a hollow first shaft that extends in the axial direction around the motor axis and is connected to the rotor from the other axial side; the second bearing holder supports the first shaft via the second bearing, the flow path includes a second inner-shaft flow path that is connected to the third inner-side-wall flow path and is provided in a hollow portion of the first shaft.

14. The drive device according to claim 13.

15. a transmission mechanism having a plurality of gears and transmitting power from the motor; a pump that pumps the fluid in the flow path, the housing has a gear accommodating portion that is located on one axial side of the motor accommodating portion, has a fluid reservoir that accumulates the fluid, and accommodates the transmission mechanism; the first side wall portion partitions an internal space of the motor accommodating portion from an internal space of the gear accommodating portion, The flow path is an intake flow path connecting the fluid reservoir and the pump; The drive device according to claim 1 , further comprising: a discharge flow path connecting the pump and the first sidewall internal flow path.

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