CN111527673B

CN111527673B - Motor unit

Info

Publication number: CN111527673B
Application number: CN201880084241.5A
Authority: CN
Inventors: 福永庆介; 石川勇树; 中间隼人; 中松修平
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2017-12-28
Filing date: 2018-12-20
Publication date: 2022-12-06
Anticipated expiration: 2038-12-20
Also published as: CN111527673A; WO2019131421A1

Abstract

One embodiment of a motor unit according to the present invention includes: a motor having a motor shaft extending in a 1 st direction perpendicular to the vertical direction; an inverter that supplies electric power to the motor; a housing that houses the motor; and an inverter case fixed to one side of the housing in a 2 nd direction perpendicular to both the vertical direction and the 1 st direction, and housing the inverter. The inverter case has: an inverter case main body; and a brim portion protruding from the inverter case main body to the other side in the 2 nd direction. The housing has a 1 st support part which contacts with the brim part from the lower side in the vertical direction and supports the brim part.

Description

Motor unit

Technical Field

The present invention relates to a motor unit.

Background

A motor drive unit in which an inverter case is fixed to a housing is known. For example, in japanese laid-open gazette: japanese patent application laid-open publication No. 2011-10383 describes a motor drive unit in which an inverter case and a housing are fixed by fastening pins.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open gazette: japanese patent laid-open publication No. 2011-10383

Disclosure of Invention

Problems to be solved by the invention

In the motor drive unit as described above, since the inverter case is disposed on the upper side of the housing in the vertical direction, there is a problem that the motor drive unit becomes large in the vertical direction. In contrast, it is conceivable to fix the inverter case to one side of the case in a horizontal direction perpendicular to the vertical direction. However, in this case, since it is necessary to fix the inverter case to the case while supporting the inverter case, there is a problem in that it is difficult to fix the inverter case to the case. Further, if only the inverter case is disposed on one side of the housing in the horizontal direction, it may be difficult to sufficiently reduce the size of the entire motor drive unit.

In view of the above circumstances, an object of the present invention is to provide a motor unit having a structure in which an inverter case can be easily fixed to a housing while being downsized.

Means for solving the problems

One embodiment of the motor unit of the present invention includes: a motor having a motor shaft extending in a 1 st direction perpendicular to the vertical direction; an inverter that supplies electric power to the motor; a housing that houses the motor; and an inverter case fixed to one side of the case in a 2 nd direction perpendicular to both a vertical direction and the 1 st direction, and housing the inverter. The inverter case has: an inverter case main body; and a brim portion protruding from the inverter case main body to the other side in the 2 nd direction. The housing has a 1 st support portion that contacts the brim from a vertically lower side and supports the brim.

Effects of the invention

According to one embodiment of the present invention, a motor unit having a structure in which an inverter case can be easily fixed to a housing while being downsized is provided.

Drawings

Fig. 1 is a conceptual diagram of a motor unit according to an embodiment.

Fig. 2 is a perspective view of a motor unit according to an embodiment.

FIG. 3 is a side schematic view of a motor unit of one embodiment.

FIG. 4 is an exploded view of an embodiment of a housing.

FIG. 5 is a side view of one embodiment of a motor unit.

Fig. 6 is a bottom view of the motor unit of the embodiment as viewed from the lower side.

Fig. 7 is a perspective view showing a part of a motor unit according to an embodiment.

Fig. 8 is a perspective view of an inverter unit according to an embodiment.

Fig. 9 is a sectional view showing a part of a motor unit of one embodiment.

Fig. 10 is a schematic diagram showing a part of a mounting step of an inverter unit of one embodiment.

Fig. 11 is a schematic diagram showing a part of a mounting step of an inverter unit of an embodiment.

Fig. 12 is a schematic diagram showing a part of a mounting step of an inverter unit of one embodiment.

Detailed Description

Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

In the following description, the direction of gravity is defined according to the positional relationship when the motor unit is mounted on a vehicle on a horizontal road surface. In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system. In the XYZ coordinate system, the Z-axis direction shows a vertical direction (i.e., the up-down direction), + Z direction is the upper side (the opposite side to the direction of gravity), and-Z direction is the lower side (the direction of gravity). The X-axis direction is a direction perpendicular to the Z-axis direction, and shows the front-rear direction of the vehicle on which the motor unit 1 is mounted, + X direction is the vehicle front direction, and-X direction is the vehicle rear direction. However, the + X direction may be the vehicle rear direction and the-X direction may be the vehicle front direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and shows the width direction (left-right direction) of the vehicle, + Y direction is the left side of the vehicle, and-Y direction is the right side of the vehicle. However, when the + X direction is the rear of the vehicle, the + Y direction may be the right side of the vehicle and the-Y direction may be the left side of the vehicle.

In the following description, unless otherwise specified, a direction (Y-axis direction) parallel to the motor axis J2 of the motor 2 is simply referred to as "axial direction", a radial direction about the motor axis J2 is simply referred to as "radial direction", and a circumferential direction about the motor axis J2 (i.e., a direction around the motor axis J2) is simply referred to as "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction. The direction parallel to the X-axis direction is referred to as the "front-rear direction". The positive side in the X-axis direction is referred to as "front side", and the negative side in the X-axis direction is referred to as "rear side". The positive side in the Y-axis direction is referred to as the "left side", and the negative side in the Y-axis direction is referred to as the "right side".

In the present embodiment, the axial direction, that is, the vehicle width direction corresponds to the 1 st direction. The front-rear direction corresponds to the 2 nd direction. The left side corresponds to the 1 st direction side, and the right side corresponds to the 1 st direction side. The rear side corresponds to one side in the 2 nd direction, and the front side corresponds to the other side in the 2 nd direction. The lower side corresponds to the lower side in the vertical direction, and the upper side corresponds to the upper side in the vertical direction.

Hereinafter, a motor unit (electric drive device) 1 according to an exemplary embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a conceptual diagram of a motor unit 1 according to an embodiment. Fig. 2 is a perspective view of the motor unit 1. Fig. 1 is a conceptual diagram, and the arrangement and size of each portion are not necessarily the same as those of the actual portion.

The motor unit 1 is mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as a power source for these vehicles.

As shown in fig. 1, the motor unit 1 includes a motor (main motor) 2, a gear portion 3, a housing 6, oil O contained in the housing 6, an inverter unit 8, and a parking mechanism 7.

As shown in fig. 1, the motor 2 includes: a rotor 20 that rotates about a motor axis J2 extending in the horizontal direction; and a stator 30 located radially outside the rotor 20. The housing 6 is provided with a housing space 80 for housing the motor 2 and the gear portion 3. That is, the housing 6 houses the motor 2 and the gear portion 3. The housing space 80 is divided into a motor chamber 81 housing the motor 2 and a gear chamber 82 housing the gear portion 3.

< Motor >

The motor 2 is housed in a motor chamber 81 of the housing 6. The motor 2 includes a rotor 20 that rotates about a motor axis J2 extending in a horizontal direction, and a stator 30 located radially outward of the rotor 20. The motor 2 is an inner rotor type motor having a stator 30 and a rotor 20 rotatably disposed inside the stator 30.

The rotor 20 is rotated by supplying electric power to the stator 30 from a battery, not shown. The rotor 20 includes a shaft (motor shaft) 21, a rotor core 24, and a rotor magnet (not shown). The rotor 20 (i.e., the shaft 21, the rotor core 24, and the rotor magnet) rotates about a motor axis J2 extending in the horizontal direction. The torque of the rotor 20 is transmitted to the gear portion 3.

The shaft 21 extends centering on a motor axis J2 extending in the width direction of the vehicle in the horizontal direction. The shaft 21 rotates about the motor axis J2. The shaft 21 is a hollow shaft provided with a hollow portion 22, and the hollow portion 22 has an inner peripheral surface extending along the motor axis J2 inside.

The shaft 21 extends across the motor chamber 81 and the gear chamber 82 of the housing 6. One end of the shaft 21 protrudes toward the gear chamber 82 side. The 1 st gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.

The rotor core 24 is formed by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending in the axial direction. A plurality of rotor magnets, not shown, are fixed to the rotor core 24. The plurality of rotor magnets are arranged in the circumferential direction such that the magnetic poles alternate.

The stator 30 surrounds the rotor 20 from the radially outer side. That is, the stator 30 is disposed radially outward of the shaft 21. The stator 30 includes 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 by the housing 6. 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. The coil wire is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes the coil 31. The coil wire is connected to the inverter unit 8 via a bus bar, not shown. The coil 31 has a coil end 31a protruding from an axial end face of the stator core 32. The coil end 31a protrudes in the axial direction from the end of the rotor core 24 of the rotor 20. The coil end 31a protrudes to both axial sides with respect to the rotor core 24.

< gear part >

The gear portion 3 is housed in a gear chamber 82 of the housing 6. The gear portion 3 is connected to the shaft 21 on one axial side of the motor axis J2. The gear portion 3 has a reduction gear 4 and a differential gear 5. That is, the motor unit 1 has a reduction gear 4 and a differential gear 5. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear 4.

< reduction gear >

The reduction gear 4 is connected to the rotor 20 of the motor 2. The reduction gear 4 reduces the rotation speed of the motor 2, and has a function of increasing the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5.

The reduction gear unit 4 has a 1 st gear (intermediate drive gear) 41, a 2 nd gear (intermediate gear) 42, a 3 rd gear (final drive gear) 43, and an intermediate shaft 45. The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the motor 2 shaft 21, the 1 st gear 41, the 2 nd gear 42, the counter shaft 45, and the 3 rd gear 43. The gear ratio of each gear, the number of gears, and the like can be variously changed according to the required reduction ratio. The reduction gear 4 is a parallel-axis gear type reduction gear in which the axes of the gears are arranged in parallel.

The 1 st gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The 1 st gear 41 rotates about the motor axis J2 together with the shaft 21. The intermediate shaft 45 extends in the axial direction of the motor axis J2 and extends along an intermediate axis J4 parallel to the motor axis J2. The intermediate shaft 45 rotates about the intermediate axis J4. The 2 nd gear 42 and the 3 rd gear 43 are provided on the outer peripheral surface of the intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 are connected via an intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 rotate about the intermediate axis J4. The 2 nd gear 42 meshes with the 1 st gear 41. Thereby, the 2 nd gear 42 is connected to the motor 2 via the 1 st gear 41. The 3 rd gear 43 meshes with the ring gear 51 of the differential device 5. The 3 rd gear 43 is located on the partition wall 61c side with respect to the 2 nd gear 42. In the present embodiment, the 2 nd gear 42 corresponds to an intermediate gear.

< differential device >

The differential device 5 is connected to the reduction gear 4. The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has a function of absorbing a speed difference between the left and right wheels and transmitting the same torque to the axles 55 of the left and right wheels when the vehicle turns. The differential device 5 has a ring gear 51, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

The ring gear 51 rotates about a differential axis J5 extending in the axial direction of the motor axis J2 and parallel to the motor axis J2. The ring gear 51 is connected to the reduction gear 4. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. That is, the ring gear 51 is connected to the motor 2 via another gear.

(arrangement of axes)

Fig. 3 is a schematic side view of the motor unit 1.

The motor axis J2, the intermediate axis J4, and the differential axis J5 extend in parallel with each other in the horizontal direction. The intermediate axis J4 and the differential axis J5 are located on the lower side with respect to the motor axis J2. Therefore, the reduction gear 4 and the differential gear 5 are located below the motor 2.

When viewed from the axial direction of the motor axis J2, a line segment virtually connecting the motor axis J2 and the intermediate axis J4 is defined as a 1 st line segment L1, a line segment virtually connecting the intermediate axis J4 and the differential axis J5 is defined as a 2 nd line segment L2, and a line segment virtually connecting the motor axis J2 and the differential axis J5 is defined as a 3 rd line segment L3.

The 2 nd line segment L2 extends substantially in the horizontal direction. That is, the intermediate axis J4 and the differential axis J5 are substantially horizontally aligned. In the present embodiment, the substantially horizontal direction in which the 2 nd line segment L2 extends is a direction within ± 10 ° from the horizontal direction.

The angle α formed by the 2 nd line segment L2 and the 3 rd line segment L3 is 30 ° ± 5 °.

The 1 st line segment L1 extends substantially in the vertical direction. That is, the motor axis J2 and the intermediate axis J4 are substantially aligned in the vertical direction. In the present embodiment, the substantially vertical direction in which the 1 st line segment L1 extends is a direction within ± 10 ° with respect to the vertical direction.

The length L1 of the 1 st line segment, the length L2 of the 2 nd line segment, and the length L3 of the 3 rd line segment satisfy the following relationship.

L1：L2：L3＝1：1.4～1.7：1.8～2.0

The reduction ratio from the motor 2 to the reduction mechanism of the differential device 5 is 8 or more and 11 or less. According to the present embodiment, the positional relationship among the motor axis J2, the intermediate axis J4, and the differential axis J5 as described above can be maintained, and a desired gear ratio (8 or more and 11 or less) can be achieved.

< outer case >

As shown in fig. 1, the motor 2 and the gear portion 3 are housed in a housing space 80 provided inside the housing 6. The housing 6 holds the motor 2 and the gear portion 3 in the housing space 80. The housing 6 has a partition wall 61c. The housing space 80 of the housing 6 is partitioned by a partition wall 61c into a motor chamber 81 and a gear chamber 82. The motor chamber 81 houses the motor 2. The gear chamber 82 houses the gear portion 3 (i.e., the reduction gear 4 and the differential gear 5).

An oil reservoir P in which the oil supply O is stored is provided in a lower region in the housing space 80. In the present embodiment, the bottom 81a of the motor chamber 81 is located above the bottom 82a of the gear chamber 82. A partition wall 61c that partitions the motor chamber 81 and the gear chamber 82 is provided with a partition wall opening 68. The partition wall opening 68 communicates the motor chamber 81 with the gear chamber 82. The partition wall opening 68 moves the oil O accumulated in the lower region of the motor chamber 81 to the gear chamber 82.

Part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is lifted by the operation of the differential device 5, a part of the oil is supplied to the 1 st oil passage 91, and a part of the oil is diffused in the gear chamber 82. The oil O diffused in the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82, and the oil O is distributed over the tooth surfaces of the gears. The oil O for the reduction gear 4 and the differential gear 5 drops and is collected by the oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is such that a part of the bearings of the differential device 5 is immersed in the oil O when the motor unit 1 is stopped.

As shown in fig. 2, the housing 6 has a 1 st housing part 61, a 2 nd housing part 62, and a closing part 63. The 2 nd housing part 62 is located on the left side (+ Y direction) of the 1 st housing part 61. The closed portion 63 is located on the right side (-Y direction) with respect to the 1 st housing part 61. The housing 6 may be formed of three or more members.

Fig. 4 is an exploded view of the housing 6.

The 1 st housing part 61 has: a cylindrical peripheral wall portion 61a surrounding the motor 2 from the outside in the radial direction; and a side plate portion 61b located on one axial side of the peripheral wall portion 61a. The space inside the peripheral wall portion 61a constitutes a motor chamber 81. As shown in fig. 4, the peripheral wall portion 61a has a shoulder portion 61j protruding rearward at an upper portion. The shoulder portion 61j has a substantially rectangular parallelepiped shape extending in the axial direction. The upper surface of the shoulder 61j is perpendicular to the vertical direction. The upper end of the shoulder 61j is a part of the upper end of the peripheral wall 61a.

The shoulder portion 61j has a 1 st opening hole 61i on the rear side face. That is, the housing 6 has the 1 st opening hole 61i. The 1 st opening hole 61i penetrates a wall portion on the rear side of the shoulder portion 61j in the front-rear direction, and is opened on the rear side. The 1 st opening hole 61i is an elongated circle that is long in the axial direction when viewed from the rear side.

The side plate portion 61b includes a partition wall 61c and a protruding plate portion 61d. The partition wall 61c covers the opening of the circumferential wall 61a on one axial side. The partition wall 61c is provided with a through-insertion hole 61f through which the shaft 21 of the motor 2 is inserted, in addition to the partition wall opening 68 described above. The side plate portion 61b includes a partition wall 61c and a protruding plate portion 61d that protrudes outward in the radial direction with respect to the peripheral wall portion 61a. The projecting plate portion 61d is provided with a 1 st axle passage hole 61e through which a drive shaft (not shown) for supporting a wheel passes.

The closing portion 63 is fixed to the peripheral wall portion 61a of the 1 st housing member 61. The closing portion 63 closes the opening of the cylindrical 1 st case member 61. The closing portion 63 has a closing portion body 63a and a cover member 63b. The closing portion body 63a is provided with a window portion 63c penetrating in the axial direction. The cover member 63b closes the window 63c from the outside of the housing space 80.

The 2 nd housing member 62 is fixed to the side plate portion 61b of the 1 st housing member 61. The 2 nd housing member 62 has a concave shape that opens toward the side plate portion 61b. The opening of the 2 nd housing member 62 is covered with the side plate portion 61b. The space between the 2 nd housing member 62 and the side plate portion 61b constitutes a gear chamber 82 in which the gear portion 3 is housed. That is, the 2 nd housing member 62 houses the reduction gear 4 and the differential gear 5. The 2 nd housing part 62 is provided with a 2 nd axle passage hole 62e. The 2 nd axle passage hole 62e overlaps the 1 st axle passage hole 61e as viewed in the axial direction.

The peripheral wall portion 61a of the 1 st housing member 61 and the closing portion 63 constitute a motor chamber 81, surround the motor 2, and house the motor 2. That is, the peripheral wall portion 61a and the closing portion 63 constitute the motor housing portion 6a shown in fig. 1.

Similarly, the side plate portion 61b of the 1 st housing member 61 and the 2 nd housing member 62 form a gear chamber 82, surround the gear portion 3, and house the gear portion 3. That is, the side plate portion 61b and the 2 nd housing member 62 constitute the gear housing portion 6b shown in fig. 1.

Thus, the housing 6 has: a motor housing section 6a in which a motor chamber 81 housing the motor 2 is provided; and a gear housing portion 6b in which a gear chamber 82 housing the gear portion 3 is provided.

Fig. 5 is a side view of the motor unit 1. Fig. 6 is a bottom view of the motor unit 1 as viewed from below. In fig. 5 and 6, the inverter unit 8 is not shown.

As shown in fig. 5 and 6, the gear housing portion 6b has a protruding portion 6d that protrudes radially with respect to the motor housing portion 6a when viewed from the axial direction. In the present embodiment, the protruding portion 6d protrudes rearward and downward with respect to the motor housing portion 6a. The protruding portion 6d receives a part of the gear portion 3. More specifically, a part of the 2 nd gear 42 and a part of the ring gear 51 are housed inside the extension portion 6d.

As shown in fig. 7, the housing 6 has a 1 st support portion 61g and a 2 nd support portion 63d. In the present embodiment, the 1 st supporting portion 61g is provided on the 1 st housing part 61. More specifically, the 1 st support portion 61g is provided on the shoulder portion 61j. The 1 st support portion 61g is an upper end portion of the rear end portions of the shoulder portions 61j. The upper surface of the 1 st supporting portion 61g is a 1 st supporting surface 61h. The 1 st bearing surface 61h is a flat surface extending in the axial direction. The 1 st support surface 61h is perpendicular to the vertical direction. The 1 st support surface 61h is recessed downward from a portion of the surface above the shoulder 61j, the portion being located forward of the 1 st support surface 61h. The 1 st bearing surface 61h extends from the end on the left side of the shoulder 61j to the end on the right side of the shoulder 61j. The right end of the 1 st support surface 61h is connected to the left surface of the closing portion 63.

The 1 st supporting portion 61g has a female screw hole 61k recessed downward from the 1 st supporting surface 61h. The female screw hole 61k is provided in plurality in the axial direction. In fig. 7, for example, 3 female screw holes 61k are provided.

In the present embodiment, the 2 nd support portion 63d is provided in the closing portion 63. The 2 nd support portion 63d is an upper side end portion of the rear side end portions in the closed portion main body 63 a. The 2 nd supporting portion 63d protrudes upward from the 1 st supporting portion 61g. The 2 nd support portion 63d is a portion that protrudes upward of the peripheral wall portion 61a when viewed from the left side. The 2 nd supporting portion 63d is disposed on the right side of the 1 st supporting portion 61g as viewed in the vertical direction. The left surface of the 2 nd support portion 63d is a 2 nd support surface 63e. The 2 nd bearing surface 63e is a flat surface. The 2 nd bearing surface 63e is perpendicular to the axial direction. The end portion on the right side of the 1 st bearing surface 61h is connected to the 2 nd bearing surface 63e. The 2 nd support portion 63d can support the positioning member MP, which will be described later, from the right side via the 2 nd support surface 63e.

< oil >)

As shown in fig. 1, the oil O circulates in an oil passage 90 provided in the casing 6. The oil passage 90 is a path of the oil O that supplies the oil O from the oil reservoir P to the motor 2.

The oil O is used for lubrication of the reduction gear 4 and the differential 5. In addition, the oil O is used for cooling the motor 2. The oil O is accumulated in a lower region (i.e., the oil reservoir P) in the gear chamber 82. As the oil O, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a relatively low viscosity so as to realize the functions of a lubricating oil and a cooling oil.

< oil circuit >

As shown in fig. 1, an oil passage 90 is provided in the housing 6. The oil passage 90 is located in the housing space 80 in the housing 6. The oil passage 90 is configured to span the motor chamber 81 and the gear chamber 82 of the housing space 80. The oil passage 90 is a path of the oil O that passes through the motor 2 from the oil reservoir P on the lower side of the motor 2 (i.e., the lower region in the housing space 80) and is guided again to the oil reservoir P on the lower side of the motor 2.

In the present specification, the "oil passage" refers to a path of the oil O circulating in the housing space 80. Thus, "oil passage" is a concept as follows: the "flow path" for stably flowing the oil in one direction at all times is not limited to the formation, and a path (for example, a reserve tank) for temporarily retaining the oil and a path for dropping the oil are also included.

The oil passage 90 has a 1 st oil passage 91 that passes through the inside of the motor 2; and a 2 nd oil passage 92 passing through the outside of the motor 2. The oil O cools the motor 2 from the inside and the outside in the 1 st oil passage 91 and the 2 nd oil passage 92.

Both the 1 st oil passage 91 and the 2 nd oil passage 92 are paths for supplying the oil O from the oil reservoir P to the motor 2 and for recovering the oil O from the oil reservoir P again. In the 1 st oil passage 91 and the 2 nd oil passage 92, the oil O drops from the motor 2 and is accumulated in a lower region in the motor chamber 81. The oil O accumulated in the lower region of the motor chamber 81 moves to the lower region of the gear chamber 82 (i.e., the oil reservoir P) through the partition wall opening 68. That is, the 1 st oil passage 91 and the 2 nd oil passage 92 include a path for moving the oil O from a lower region in the motor chamber 81 to a lower region in the gear chamber 82.

(1 st oil path)

As shown in fig. 1, in the 1 st oil passage 91, the oil O is lifted from the oil reservoir P by the differential device 5 and is guided to the inside of the rotor 20. Inside the rotor 20, a centrifugal force based on the rotation of the rotor 20 is applied to the oil O. Thereby, the oil O is uniformly diffused toward the stator 30 surrounding the rotor 20 from the radial outside, and cools the stator 30.

The 1 st oil passage 91 has a lift path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. Further, a 1 st reservoir 93 is provided in the path of the 1 st oil passage 91. The 1 st storage tank 93 is provided in the gear chamber 82.

The lift path 91a is a path for lifting the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O from the 1 st reserve tank 93. As shown in fig. 3, the 1 st reserve tank 93 is disposed between the intermediate axis J4 and the differential axis J5. The 1 st storage tank 93 is open to the upper side. The 1 st storage tank 93 receives the oil O lifted by the ring gear 51. Further, the 1 st storage tank 93 receives the oil O lifted by the 2 nd gear 42 and the 3 rd gear 43 in addition to the oil lifted by the ring gear 51, such as in a case where the liquid level of the oil reservoir P is high immediately after the motor 2 is driven.

The shaft supply path 91b guides the oil O from the 1 st reservoir 93 to the motor 2. The shaft supply path 91b is formed by a hole portion 94 provided in the 2 nd housing part 62. The in-shaft path 91c is a path through which the oil O passes through the hollow portion 22 of the shaft 21. The rotor inner path 91d is a path through which the oil O passes from the communication hole 23 of the shaft 21 to the inside of the rotor core 24 and splashes toward the stator 30.

In the in-shaft path 91c, a centrifugal force based on the rotation of the rotor 20 is applied to the oil O inside the rotor 20. Thereby, the oil O continuously splashes outward in the radial direction from the rotor 20. The path inside the rotor 20 becomes negative pressure due to the splashing of the oil O, and the oil O stored in the 1 st reservoir 93 is sucked into the rotor 20 to fill the path inside the rotor 20 with the oil O.

The oil O that has reached the stator 30 takes heat from the stator 30. The oil O that has cooled the stator 30 drops downward and is accumulated in the lower region in the motor chamber 81. The oil O accumulated in the lower region of the motor chamber 81 moves to the gear chamber 82 through the partition wall opening 68 provided in the partition wall 61c.

(2 nd oil path)

As shown in fig. 1, in the 2 nd oil passage 92, the oil O is drawn up to the upper side of the motor 2 from the oil reservoir P and supplied to the motor 2. The oil O supplied to the motor 2 is transferred to the outer peripheral surface of the stator 30, and takes heat from the stator 30 to cool the motor 2. The oil O transferred to the outer peripheral surface of the stator 30 drops downward and is accumulated in the lower region in the motor chamber 81. The oil O in the 2 nd oil passage 92 and the oil O in the 1 st oil passage 91 merge in a lower region in the motor chamber 81. The oil O accumulated in the lower region of the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) of the gear chamber 82 via the partition wall opening 68.

The 2 nd oil passage 92 has a 1 st flow passage 92a, a 2 nd flow passage 92b, and a 3 rd flow passage 92c. A pump 96, a cooler 97, and a 2 nd reservoir tank 98 are provided in the path of the 2 nd oil passage 92. The pump 96 supplies the oil O to the motor 2. Cooler 97 cools oil O passing through 2 nd oil passage 92. In the 2 nd oil passage 92, the oil O passes through the 1 st flow passage 92a, the pump 96, the 2 nd flow passage 92b, the cooler 97, the 3 rd flow passage 92c, and the 2 nd reservoir tank 98 in this order, and is supplied to the motor 2.

The 1 st flow path 92a, the 2 nd flow path 92b, and the 3 rd flow path 92c pass through a wall portion of the casing 6 surrounding the housing space 80. The 1 st flow path 92a connects the oil reservoir P to the pump 96. The 2 nd flow path 92b connects the pump 96 and the cooler 97. The 3 rd flow path 92c connects the cooler 97 to the housing space 80.

In the present embodiment, the 1 st flow path 92a, the 2 nd flow path 92b, and the 3 rd flow path 92c pass through the inside of the wall portion of the casing 6 surrounding the housing space 80. Therefore, it is not necessary to separately prepare a pipe material, which contributes to reduction in the number of components.

The pump 96 is an electrically driven electric pump. The pump 96 sucks up the oil O from the oil reservoir P through the 1 st flow path 92a, and supplies the oil O to the motor 2 through the 2 nd flow path 92b, the cooler 97, the 3 rd flow path 92c, and the 2 nd reservoir tank 98.

As shown in fig. 6, the pump 96 includes a pump mechanism portion 96p, a pump motor 96m, a suction port 96a, and a discharge port 96b. In the present embodiment, the pump mechanism portion 96p is a trochoidal pump (not shown) in which an external gear and an internal gear are meshed with each other and rotate. The pump motor 96m rotates the internal gear of the pump mechanism portion 96 p. A gap between the internal gear and the external gear of the pump mechanism portion 96p is connected to the suction port 96a and the discharge port 96b.

The suction port 96a of the pump 96 is connected to the 1 st flow path 92a. Further, the discharge port 96b of the pump 96 is connected to the 2 nd flow path 92b. The pump 96 sucks up the oil O from the oil reservoir P through the 1 st passage 92a, and supplies the oil O to the motor 2 through the 2 nd passage 92b, the cooler 97, the 3 rd passage 92c, and the 2 nd reservoir tank 98.

The pump motor 96m rotates the internal gear of the pump mechanism portion 96 p. The rotation axis J6 of the pump motor 96m is parallel to the motor axis J2. The pump 96 having the pump motor 96m is easily formed into a long shape in the rotation axis J6 direction. According to the present embodiment, the radial dimension of the motor unit 1 can be reduced by making the rotation axis J6 of the pump motor 96m parallel to the motor axis J2. Further, by reducing the radial dimension of the motor unit 1, the pump 96 can be easily disposed to overlap the extension portion 6d of the housing 6 when viewed from the axial direction. As a result, the projection area in the axial direction of the motor unit 1 is suppressed from increasing, and a structure that facilitates downsizing of the motor unit 1 can be realized.

The pump 96 is located on the lower side of the motor chamber 81. The pump 96 is fixed to a surface of the extension portion 6d facing the motor housing portion 6a. The suction port 96a of the pump 96 is disposed opposite to the extension portion 6d. The 1 st flow path 92a connected to the suction port 96a of the pump 96 linearly penetrates the wall surface of the extension portion 6d in the axial direction, and opens to a lower region in the gear chamber 82. That is, the 1 st flow path 92a is provided in the extension portion 6d, and the 1 st flow path 92a extends in the axial direction and is connected to the pump 96 from a lower region (i.e., the oil reservoir P) in the gear chamber 82.

According to the present embodiment, since the pump 96 is disposed below the motor chamber 81, the suction port 96a is easily disposed in the vicinity of the oil reservoir P. As a result, the 1 st flow path 92a connecting the oil reservoir P and the suction port 96a can be shortened. Further, since the oil reservoir P is located at a short distance from the suction port 96a, the 1 st flow path 92a can be a straight flow path. By making the 1 st flow path 92a straight and short flow path, the pressure loss in the path from the oil reservoir P to the pump 96 can be reduced, and efficient circulation of the oil O can be achieved.

As shown in fig. 1, the cooler 97 is connected to a 1 st flow path 92a and a 2 nd flow path 92b. The 1 st flow path 92a and the 2 nd flow path 92b are connected via an internal flow path of the cooler 97. A cooling water pipe 97j through which cooling water cooled by a radiator (not shown) passes is connected to the cooler 97. The oil O passing through the cooler 97 and the cooling water passing through the cooling water pipe 97j are cooled by heat exchange. Further, an inverter unit 8 is provided in a path of the cooling water pipe 97j. The cooling water passing through the cooling water pipe 97j cools the inverter unit 8.

As shown in fig. 5, the cooler 97 is fixed to the outer peripheral surface of the motor housing 6a facing radially outward below the motor chamber 81. As shown in fig. 1, the oil O supplied to the motor 2 temporarily accumulates in the lower region in the motor chamber 81, and then moves to the lower region in the gear chamber 82 through the partition wall opening 68. According to the present embodiment, since the cooler 97 is fixed to the outer peripheral surface of the motor housing 6a below the motor chamber 81, the oil O accumulated in the lower region in the motor chamber 81 can be cooled from the installation surface of the cooler 97 through the wall surface of the motor housing 6a.

As shown in fig. 5, the cooler 97 and the pump 96 at least partially overlap the protruding portion 6d of the gear housing portion 6b when viewed from the axial direction. The gear portion 3 is housed inside the protruding portion 6d. The projection area of the projecting portion 6d in the axial direction is determined according to the size of each gear of the gear portion 3. The size of each gear constituting the gear portion 3 is set to satisfy a desired gear ratio. Therefore, it is difficult to reduce the projection area of the extension portion 6d in the axial direction. According to the present embodiment, the cooler 97 and the pump 96 are disposed so as to overlap the extension portion 6d in the axial direction, so that the cooler 97 and the pump 96 can be prevented from increasing the projection area of the motor unit 1 in the axial direction. This suppresses an increase in the projection area of the motor unit 1 in the axial direction, and the motor unit 1 can be downsized.

According to the present embodiment, the cooler 97 and the pump 96 at least partially overlap with the 2 nd gear 42 of the gear portion 3 when viewed from the axial direction. Therefore, even when the projected area as viewed in the axial direction of the projecting portion 6d is made as small as possible along the outer shape of each gear of the gear portion 3, the cooler 97 and the pump 96 can be configured to overlap the projecting portion 6d as viewed in the axial direction. As a result, the projection area in the axial direction of the motor unit 1 is suppressed from increasing, and the motor unit 1 can be downsized.

According to the present embodiment, the cooler 97 and the pump 96 are located above the lower end of the extension portion 6d. That is, the cooler 97 and the pump 96 do not protrude further downward from the lower end of the protruding portion 6d. Therefore, the motor unit 1 can be downsized in the vertical direction.

The cooler 97 and the pump 96 are located on the lower side of the motor chamber 81. The motor unit 1 is disposed in a hood of a vehicle, for example. In the motor unit 1, the cooler 97 and the pump 96 are projections projecting from the housing 6. According to the present embodiment, by disposing the cooler 97 and the pump 96 below the motor chamber 81, even when the vehicle collides with the object due to an accident or the like, the cooler 97 and the pump 96, which are projections, can be prevented from colliding with the object.

According to the present embodiment, the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6. Therefore, it is possible to contribute to downsizing of the motor unit 1, compared to a case where the pump 96 and the cooler 97 are fixed to a structure outside the housing 6. Further, by fixing the pump 96 and the cooler 97 to the outer peripheral surface of the casing 6, the flow path connecting the housing space 80 to the pump 96 and the cooler 97 can be configured by the 1 st flow path 92a, the 2 nd flow path 92b, and the 3 rd flow path 92c passing through the wall portion of the casing 6.

As shown in fig. 6, according to the present embodiment, the position of the pump 96 and the position of the cooler 97 in the axial direction overlap each other. The cooler 97 is connected to the pump 96 via the 2 nd flow path 92b. That is, 2 nd flow path 92b connecting pump 96 and cooler 97 is provided in 2 nd oil path 92. According to the present embodiment, the axial positions of the pump 96 and the cooler 97 are overlapped with each other, so that the 2 nd flow path 92b can be linearly extended in the direction perpendicular to the axial direction. That is, the 2 nd flow path 92b can be a straight and short flow path, and the pressure loss in the path from the pump 96 to the cooler 97 can be reduced, thereby achieving efficient oil O circulation.

As shown in fig. 1, the 2 nd storage tank 98 is located in the motor chamber 81 of the storage space 80. The 2 nd storage tank 98 is located at the upper side of the motor. The 2 nd reservoir tank 98 stores the oil O supplied to the motor chamber 81 through the 3 rd flow path 92c. The 2 nd storage tank 98 has a plurality of outflow ports 98a. The oil O accumulated in the 2 nd reservoir 98 is supplied to the motor 2 through the respective outflow ports 98a. The oil O flowing out of the outflow port 98a of the 2 nd reserve tank 98 flows along the outer peripheral surface of the motor 2 from the upper side toward the lower side, and takes heat from the motor 2. This enables the entire motor 2 to be cooled.

The 2 nd storage tank 98 extends in the axial direction. The outlet 98a of the 2 nd reserve tank 98 is provided at both axial ends of the 2 nd reserve tank 98. The outflow port 98a is located on the upper side of the coil end 31a. This allows the oil O to be poured onto the coil ends 31a located at both ends of the stator 30 in the axial direction, thereby directly cooling the coils 31.

After cooling the coil 31, the oil O drops downward and is accumulated in a lower region in the motor chamber 81. The oil O accumulated in the lower region of the motor chamber 81 moves to the gear chamber 82 through the partition wall opening 68 provided in the partition wall 61c.

According to the present embodiment, a cooler 97 for cooling oil O is provided in the path of 2 nd oil passage 92. The oil O cooled by the cooler 97 through the 2 nd oil passage 92 merges with the oil O through the 1 st oil passage 91 in the oil reservoir P. In the oil reservoir P, the oil O passing through the 1 st oil passage 91 and the 2 nd oil passage 92 are mixed with each other to perform heat exchange. Therefore, the cooling effect of cooler 97 disposed in the path of 2 nd oil passage 92 can be also applied to oil O passing through 1 st oil passage 91.

< inverter unit >

The inverter unit 8 is electrically connected to the motor 2. The inverter unit 8 controls the current supplied to the motor 2. As shown in fig. 5, the inverter unit 8 is fixed to the housing 6. More specifically, the inverter unit 8 is fixed to the outer peripheral surface of the motor housing portion 6a facing radially outward.

The inverter unit 8 overlaps at least a part of the protruding portion 6d of the gear housing portion 6b when viewed from the axial direction. According to the present embodiment, when viewed from the axial direction, the inverter unit 8 is disposed so as to overlap the extension portion 6d, whereby the inverter unit 8 can be prevented from increasing the projection area of the motor unit 1 in the axial direction. This suppresses an increase in the projection area of the motor unit 1 in the axial direction, and the motor unit 1 can be downsized.

According to the present embodiment, the inverter unit 8 at least partially overlaps with the ring gear 51 of the gear portion 3 when viewed from the axial direction. Therefore, even when the projected area of the projecting portion 6d as viewed in the axial direction is as small as possible along the outer shape of each gear of the gear portion 3, the inverter unit 8 can be configured to overlap the projecting portion 6d in the axial direction. As a result, the projection area in the axial direction of the motor unit 1 is suppressed from increasing, and the motor unit 1 can be downsized.

According to the present embodiment, the inverter unit 8 is located on the opposite side of the cooler 97 with respect to the motor axis J2 when viewed from the vertical direction. Therefore, when viewed from the axial direction, the region overlapping the protruding portion 6d is effectively used, the size of the motor unit 1 in the horizontal direction can be reduced, and the motor unit 1 can be downsized.

As shown in fig. 1, a coolant pipe 97j extending from an unillustrated radiator is connected to the inverter unit 8. This enables the inverter unit 8 to be efficiently cooled. The cooling water flowing through the cooling water pipe 97j also cools the motor housing portion 6a in contact with the housing portion via the housing portion of the inverter unit 8.

As shown in fig. 8 and 9, the inverter unit 8 includes an inverter case 110 and an inverter 140. That is, the motor unit 1 has the inverter case 110 and the inverter 140.

As shown in fig. 9, the inverter case 110 houses an inverter 140. The inverter case 110 is fixed to the rear side of the case 6. The inverter case 110 is fixed to the housing 6 by, for example, screws. In the present embodiment, the inverter case 110 is fixed only to the 1 st shell member 61 in the shell 6.

As shown in fig. 8, the inverter case 110 has an inverter case main body 111, a cover 112, and a brim 113. The inverter case body 111 has a substantially rectangular parallelepiped shape elongated in the axial direction and has a box shape with an upper side opened. As shown in fig. 3, the inverter case body 111 is disposed above the differential axis J5. Therefore, in the configuration in which the motor axis J2, the intermediate axis J4, and the differential axis J5 extend in the same direction as in the present embodiment, the space above the differential axis J5, in which the dead space is easily generated, can be effectively used as the arrangement space of the inverter unit 8. Therefore, the motor unit 1 can be easily miniaturized as a whole.

As shown in fig. 8, the inverter case body 111 has a 2 nd opening hole 111a on a front surface. The 2 nd opening hole 111a penetrates a front wall portion of the inverter case body 111 in the front-rear direction and opens to the front side. The 2 nd opening hole 111a is formed in an axially long and oblong shape when viewed from the front side. As shown in fig. 9, the 2 nd aperture 111a faces the 1 st aperture 61i in the front-rear direction. In the present embodiment, the 1 st aperture 61i and the 2 nd aperture 111a overlap each other as a whole when viewed in the axial direction. As shown in fig. 8, the cover 112 is attached to the upper side of the inverter case main body 111. The cover 112 closes the opening on the upper side of the inverter case main body 111.

The eaves 113 protrudes forward from the inverter case main body 111. More specifically, the eaves 113 protrude forward from the left-side portion of the upper end of the inverter case body 111. The eaves 113 is a plate whose plate surface is perpendicular to the vertical direction. The eaves 113 extend in the axial direction. As shown in fig. 10, a dimension W1 of the eave portion 113 in the front-rear direction is larger than a distance W2 in the front-rear direction from the rear end of the 1 st supporting portion 61g to the rear end of the bus bar supporting member 120 described later. The distance W2 corresponds to a protruding length of the bus bar support member 120 protruding from the housing 6 to the rear side.

As shown in fig. 8, the brim 113 has a fixing hole 113a penetrating the brim 113 in the vertical direction. The fixing hole 113a is provided in plurality in the axial direction. In fig. 8, three fixing holes 113a are provided, for example.

As shown in fig. 2, the eave portion 113 contacts the 1 st support portion 61g from above. That is, the 1 st support portion 61g contacts the eave portion 113 from below in the vertical direction to support the eave portion 113. The eaves 113 is fixed to the 1 st supporting portion 61g by screwing a screw, which passes through the fixing hole 113a from above, into the female screw hole 61k. The eaves 113 is disposed on the left side of the 2 nd support 63d so as to face each other with a gap therebetween. That is, the 2 nd support surface 63e is axially opposed to the right end of the brim 113 with a gap therebetween. Thus, a gap is provided between the right end of the brim 113 and the axial direction of the 2 nd support portion 63d when viewed in the vertical direction.

The brim 113 is disposed on the right side of the 2 nd housing part 62. The right end of the eave 113 is located on the left side of the right end of the 1 st outer shell member 61. The range of the axial position of the brim 113 is included in the range of the axial position of the 1 st outer shell member 61. In the present embodiment, the brim 113 entirely overlaps the 1 st jacket member 61 when viewed in the vertical direction.

As shown in fig. 9, the inverter 140 includes a terminal portion 140a and a circuit board, not shown, provided with the terminal portion 140 a. An inverter circuit is provided on the circuit board. The terminal portion 140a has a plate shape whose plate surface is perpendicular to the vertical direction and extends in the front-rear direction. The terminal portion 140a is fixed to an upper surface of the base portion 141 inside the inverter case 110.

The motor unit 1 also has a bus bar support member 120, a 1 st O-ring 151, a 2 nd O-ring 152, and a bus bar 130. The bus bar support member 120 is a resin member that supports the bus bar 130. The bus bar support member 120 is inserted across the 1 st opening hole 61i and the 2 nd opening hole 111a, and fitted into the 1 st opening hole 61i and the 2 nd opening hole 111a. The bus bar support member 120 has a bus bar support member main body 121 and a convex portion 122. As shown in fig. 7, the bus bar support member main body 121 is a columnar shape extending in the front-rear direction. The busbar support member main body 121 has an axially long oblong shape when viewed from the front-rear direction.

As shown in fig. 9, the front end of the bus bar support member main body 121 is disposed at substantially the same position as the front end of the 1 st opening 61i in the front-rear direction. The rear end of the bus bar support member main body 121 is disposed at substantially the same position as the rear end of the 2 nd opening 111a in the front-rear direction.

The bus bar support member main body 121 has a through hole 121a penetrating the bus bar support member main body 121 in the front-rear direction. The through-hole 121a is disposed at the center of the bus bar support member main body 121 in the vertical direction. Although not shown, the through-hole 121a is formed in a rectangular shape that is axially long when viewed from the front-rear direction. The bus bar 130 passes through the through-hole 121a. Although not shown, a plurality of through holes 121a are provided in the axial direction. In the present embodiment, for example, 3 through holes 121a are provided.

The bus bar support member main body 121 has

grooves

123a, 123b recessed from the outer peripheral surface of the bus bar support member main body 121. The

grooves

123a and 123b are annular grooves provided around the outer peripheral surface of the bus bar support member main body 121. The groove 123a is provided in a portion of the bus bar support member main body 121 into which the 1 st opening hole 61i is inserted. The groove 123b is provided in a portion of the bus bar support member main body 121 that is inserted into the 2 nd opening hole 111a.

As shown in fig. 7 and 9, the convex portion 122 protrudes in the vertical direction from the bus bar supporting member main body 121. The convex portion 122 has a substantially rectangular parallelepiped shape. The convex portions 122 include a plurality of convex portions 122 protruding upward from the bus bar support member main body 121 and a plurality of convex portions 122 protruding downward from the bus bar support member main body 121. In the present embodiment, the protruding portions 122 are provided with a total of six protruding portions 122 arranged at intervals in the axial direction at the upper end portion of the bus bar support member main body 121 and three protruding portions 122 arranged at intervals in the axial direction at the lower end portion of the bus bar support member main body 121.

The convex portion 122 has a rib 122a. The rib 122a protrudes rearward from the end surface of the convex portion 122 facing rearward. The rib 122a is disposed at the center in the axial direction of each convex portion 122. The rib 122a extends from an upper end of the convex portion 122 to a lower end of the convex portion 122 in the vertical direction. The dimension of the rib 122a in the axial direction becomes smaller from the front side toward the rear side.

As shown in fig. 9, the convex portion 122 is disposed between the case 6 and the inverter case 110 in the front-rear direction. The convex portion 122 is held in contact with the case 6 and the inverter case 110. The end surface of the projection 122 facing the front side contacts the housing 6. More specifically, the end surface of the convex portion 122 facing the front side contacts the peripheral edge portion of the 1 st opening hole 61i in the rear side surface of the peripheral wall portion 61a. Thereby, the bus bar support member 120 can be positioned in the front-rear direction with respect to the housing 6.

The rib 122a contacts the inverter case 110. More specifically, the rib 122a contacts the peripheral edge of the 2 nd opening hole 111a in the front surface of the inverter case body 111. In a state where the convex portion 122 is sandwiched between the case 6 and the inverter case 110, the rib 122a is in a state where at least one of plastic deformation and elastic deformation is generated. Therefore, even if an error occurs in the dimension of the inverter case 110 and the dimension of the case 6, the error can be absorbed by the deformation of the rib 122a. Thereby, the bus bar support member 120 can be appropriately sandwiched by the case 6 and the inverter case 110. Therefore, in a state where the inverter case 110 is fixed to the case 6, the bus bar support member 120 can be suppressed from moving in the front-rear direction.

The 1 st O-ring 151 has a ring shape surrounding the bus bar support member 120 when viewed from the front-rear direction. The 1 st O-ring 151 is disposed between the inner peripheral surface of the 1 st opening hole 61i and a portion of the outer peripheral surface of the bus bar support member 120 that faces the inner peripheral surface of the 1 st opening hole 61i. The 1 st O-ring 151 contacts the inner peripheral surface of the 1 st opening hole 61i and the outer peripheral surface of the bus bar support member 120, and seals between the inner peripheral surface of the 1 st opening hole 61i and the outer peripheral surface of the bus bar support member 120. In the present embodiment, the 1 st O-ring 151 is fitted into the groove 123a and held on the outer peripheral surface of the bus bar support member 120.

The 2 nd O-ring 152 is annular to surround the bus bar support member 120 when viewed from the front-rear direction. The 2 nd O-ring 152 is disposed between the inner peripheral surface of the 2 nd opening hole 111a and a portion of the outer peripheral surface of the bus bar support member 120 that faces the inner peripheral surface of the 2 nd opening hole 111a. The 2 nd O-ring 152 contacts the inner circumferential surface of the 2 nd open hole 111a and the outer circumferential surface of the bus bar support member 120, and seals between the inner circumferential surface of the 2 nd open hole 111a and the outer circumferential surface of the bus bar support member 120. In the present embodiment, the 2 nd O-ring 152 is fitted into the groove 123b and held on the outer peripheral surface of the bus bar holding member 120. In the present embodiment, the 2 nd O-ring 152 corresponds to a seal member.

According to the present embodiment, as described above, since the movement of the bus bar support member 120 in the front-rear direction can be suppressed, the 1 st O-ring 151 and the 2 nd O-ring 152 can be suppressed from being broken by rubbing against the inner peripheral surface of each opening hole.

The bus bar 130 is a plate-shaped metal member. The bus bar 130 has a 1 st extension 131 and a 2 nd extension 132. The 1 st extending portion 131 extends in the front-rear direction. The 1 st extending part 131 is a plate shape whose plate surface is perpendicular to the vertical direction. The 1 st extending portion 131 extends from the inside of the case 6 to the inside of the inverter case 110 via the 1 st opening hole 61i and the 2 nd opening hole 111a. More specifically, the 1 st extending portion 131 extends from the inside of the shoulder portion 61j to the inside of the inverter case 110 via the 1 st opening hole 61i and the 2 nd opening hole 111a. The distance in the front-rear direction between the rear end of the 1 st extending portion 131 and the rear end of the 1 st supporting portion 61g is greater than the dimension W1 in the front-rear direction of the eave portion 113.

The 1 st extending portion 131 penetrates the through hole 121a and penetrates the bus bar support member 120 in the front-rear direction. Thus, the bus bar 130 can be prevented from contacting the inner peripheral surface of the 1 st opening hole 61i and the inner peripheral surface of the 2 nd opening hole 111a by the bus bar support member 120. Therefore, the bus bar 130 can be arranged to be insulated from the case 6 and the inverter case 110. The 1 st extending portion 131 is fitted in the through hole 121a. The 1 st extending portion 131 is fixed inside the through hole 121a by a sealing material filled inside the through hole 121a. Thereby, the 1 st extending portion 131 is fixed to the bus bar support member 120. The sealing material is, for example, an adhesive. According to the present embodiment, as described above, since the movement of the bus bar support member 120 in the front-rear direction can be suppressed, the fixation and detachment of the 1 st extending portion 131 to the bus bar support member 120 can be suppressed.

As shown in fig. 7, the 1 st extending portion 131 has a fixing hole 131a penetrating the 1 st extending portion 131 in the vertical direction. The fixing hole 131a is provided at an end of the 1 st extension 131 on the rear side. As shown in fig. 9, the rear end of the 1 st extending portion 131 is fixed to the terminal portion 140a inside the inverter case 110. More specifically, the rear end of the 1 st extending portion 131 is fixed to the terminal portion 140a by screwing a screw member 160, which passes through the fixing hole 131a from above, into a female screw hole provided in the base portion 141. The 1 st extending portion 131 and the terminal portion 140a are integrally fixed to the base portion 141 by a screw member 160. The lower surface of the 1 st extending portion 131 contacts the upper surface of the terminal portion 140 a. Thereby, the bus bar 130 is electrically connected to the inverter 140.

The 2 nd extending portion 132 extends from the end portion of the 1 st extending portion 131 on the front side to the upper side inside the housing 6. The 2 nd extending portion 132 is plate-shaped with a plate surface perpendicular to the front-rear direction. The 2 nd extending portion 132 extends upward from the 1 st opening hole 61i. Although not shown, the 2 nd extension 132 is electrically connected to the coil 31. Thereby, the bus bar 130 electrically connects the stator 30 and the inverter 140. Current is supplied from inverter 140 to stator 30 via bus bar 130. Thereby, the inverter 140 supplies electric power to the motor 2.

Parking mechanism

In an electric vehicle, since a brake mechanism for applying a brake is not provided in the vehicle except for a side brake, the parking mechanism 7 is required in the motor unit 1.

As shown in fig. 1, the parking mechanism 7 includes: a parking gear 71 fixed to the intermediate shaft 45 and rotating about an intermediate axis J4 together with the intermediate shaft 45; a rotation preventing portion 72 that moves between the teeth of the parking gear 71 and prevents rotation of the parking gear 71; and a parking motor 73 that drives the rotation blocking portion 72. When the motor 2 is operated, the rotation preventing portion 72 is retracted from the parking gear 71. On the other hand, when the shift lever is in the parking position, the parking motor 73 moves the rotation preventing portion 72 to the space between the teeth of the parking gear 71, and prevents the parking gear 71 from rotating.

The method of manufacturing the motor unit 1 of the present embodiment described above includes an attaching step of attaching the bus bar support member 120 to the housing 6 and a fixing step of fixing the inverter case 110 to the housing 6. In the mounting step, the operator inserts the bus bar support member 120 from the outside of the housing 6 into the 1 st opening hole 61i and fits the bus bar support member into the 1 st extending portion 131 protruding to the outside of the housing 6 through the 1 st opening hole 61i while passing through the through hole 121a. At this time, the bus bar support member 120 is in a state where the 1 st O-ring 151 and the 2 nd O-ring 152 are attached. The operator pushes the busbar support member 120 into the 1 st opening hole 61i until the front end surface of the convex portion 122 comes into contact with the housing 6. Thereby, the bus bar support member 120 is mounted in a state of being positioned in the front-rear direction with respect to the housing 6.

Next, in the fixing step, as shown in fig. 10, the worker positions the inverter unit 8 substantially in the vertical direction and the axial direction with respect to the housing 6, and brings the inverter unit 8 close to the housing 6 from the rear side. At this time, the operator sets the vertical position of the inverter unit 8 to a position above the 1 st support portion 61g with respect to the vertical position of the eaves portion 113. The operator moves the inverter unit 8 forward until the front end of the eaves 113 is positioned above the 1 st support portion 61g. At this time, since the distance from the rear end of the 1 st supporting portion 61g to the front end of the 1 st extending portion 131 is greater than the dimension W1 of the eave portion 113 in the front-rear direction, the front end of the 1 st extending portion 131 is inserted into the 2 nd opening hole 111a.

Next, in the fixing step, the operator moves the inverter unit 8 downward until the brim 113 comes into contact with the 1 st supporting surface 61h of the 1 st supporting portion 61g. Thereby, the eaves 113 is positioned in the vertical direction, and the inverter unit 8 can be positioned in the vertical direction with respect to the case 6. That is, the fixing step includes positioning the brim 113 in the vertical direction by contacting the 1 st support portion 61g from above.

Next, as shown in fig. 11, the operator moves the inverter unit 8 to the right side while sliding the eaves portion 113 on the 1 st support surface 61h. Here, the operator mounts the positioning member MP on the housing 6 before moving the inverter unit 8 to the right. The positioning member MP is a plate whose plate surface is perpendicular to the axial direction. The operator brings the positioning member MP into contact with the 2 nd supporting surface 63e of the 2 nd supporting portion 63d, and arranges it above the 1 st supporting portion 61g. That is, the fixing step includes a step of supporting the positioning member MP from the right side by the 2 nd support portion 63d and attaching it to the housing 6.

In a state where the positioning member MP is attached to the housing 6, the worker moves the eaves portion 113 to the right side until the right end of the eaves portion 113 comes into contact with the positioning member MP. This enables the flange 113 to be positioned in the axial direction, and the inverter unit 8 to be positioned in the axial direction with respect to the housing 6. That is, the positioning member MP can position the brim 113 in the axial direction. The fixing step includes positioning the brim 113 in the axial direction by contacting the positioning member MP from the left side.

Next, as shown in fig. 12, the operator moves the inverter unit 8 forward until the inverter case main body 111 and the 1 st case member 61 come into contact in the front-rear direction. Thereby, the inverter unit 8 can be positioned in the front-rear direction with respect to the housing 6. That is, the fixing step includes positioning the flange 113 in the vertical direction and the axial direction, and then moving the inverter case 110 forward to contact the case 6 to position the inverter case in the front-rear direction.

When the inverter unit 8 is positioned in the front-rear direction, a portion of the bus bar support member 120 protruding from the housing 6 toward the rear side is fitted into the 2 nd opening hole 111a. The convex portion 122 is sandwiched between the inverter case body 111 and the 1 st case member 61, and the rib 122a is plastically deformed or elastically deformed, or plastically deformed or elastically deformed.

As described above, the operator can position the inverter unit 8 with respect to the housing 6 in the vertical direction, the axial direction, and the front-rear direction. After positioning the inverter unit 8, the operator fixes the inverter case 110 to the case 6 with screws. More specifically, the operator screws a screw into the female screw hole 61k through the fixing hole 113a from above, and fixes the brim 113 to the 1 st supporting portion 61g. Although not shown, the operator screws the screws in the front-rear direction to fix the inverter case 110 to the case 6. In this way, the fixing step includes fixing the inverter case 110 and the housing 6 after positioning the inverter case 110 in the front-rear direction.

Then, the operator removes the positioning member MP from the housing 6. That is, the fixing step includes removing the positioning member MP after fixing the inverter case 110 and the case 6. Thereby, a gap is provided between the 2 nd support portion 63d and the brim portion 113. As described above, the operator can fix the inverter unit 8 to the housing 6.

According to the present embodiment, the inverter case 110 has the eaves 113. Therefore, even when the inverter unit 8 is disposed at a position adjacent to the housing 6 in the front-rear direction, the eaves portion 113 can be hooked on the 1 st supporting portion 61g of the housing 6 from above when the inverter case 110 is fixed to the housing 6. This allows the inverter case 110 to be positioned in the vertical direction with respect to the case 6, and the inverter case 110 to be supported by the case 6. Therefore, the inverter case 110 can be easily fixed at a position adjacent to the housing 6 in the front-rear direction, and the motor unit 1 can be easily downsized in the vertical direction.

Further, as described above, since the inverter case main body 111 is disposed above the differential axis J5 as viewed in the axial direction, the inverter case 110 can be disposed in a space-efficient manner with respect to the case 6, and further downsizing of the motor unit 1 is facilitated. As described above, according to the present embodiment, the motor unit 1 having a structure in which the inverter case 110 can be easily fixed to the case 6 while being downsized can be obtained.

In addition, according to the present embodiment, the 2 nd support portion 63d capable of supporting the positioning member MP from the right side is disposed on the right side of the brim portion 113. Therefore, by supporting the positioning member MP on the 2 nd support portion 63d, the flange 113 can be brought into contact with the positioning member MP, and the inverter case 110 can be positioned in the axial direction. Thus, the inverter case 110 can be moved closer to the case 6 in the front-rear direction while being positioned in both the vertical direction and the axial direction. Therefore, when the inverter case 110 is fixed to the case 6, the posture of the inverter case 110 can be stabilized, and the bus bar 130 passing through the 1 st opening 61i of the case 6 and the 2 nd opening 111a of the inverter case 110 can be suppressed from contacting the inner peripheral surface of each opening. Therefore, the bus bar 130 can be suppressed from being deformed, and the inverter case 110 can be positioned on the housing 6 with high accuracy. This allows bus bar 130 and inverter 140 to be arranged with high relative positional accuracy. As described above, according to the present embodiment, the motor unit 1 having the structure in which the bus bar 130 and the inverter 140 are easily connected can be obtained.

Further, according to the present embodiment, after the inverter case 110 is fixed to the case 6, the positioning member MP used when the inverter case 110 is positioned in the axial direction is removed, whereby a gap can be provided between the brim portion 113 and the 2 nd support portion 63d. By disposing the brim 113 and the 2 nd support portion 63d with a gap therebetween in this way, when vibration is applied to the motor unit 1, the brim 113 and the 2 nd support portion 63d can be prevented from rubbing against each other and being worn.

Further, according to the present embodiment, the 2 nd supporting portion 63d has the 2 nd supporting surface 63e, and the 2 nd supporting surface 63e is axially opposed to the right end portion of the brim portion 113 with a gap therebetween. Therefore, the positioning member MP is easily supported by the 2 nd supporting surface 63e. Further, since the 2 nd support surface 63e is a flat surface, the positioning member MP can be disposed with high accuracy with respect to the 2 nd support portion 63d, and the positioning accuracy of the inverter case 110 can be improved.

In addition, according to the present embodiment, the 1 st supporting surface 61h, which is the upper surface of the 1 st supporting portion 61g, is a flat surface extending in the axial direction. Therefore, after the brim 113 is brought into contact with the 1 st support surface 61h, the inverter case 110 is easily moved while sliding in the axial direction. This facilitates positioning of the inverter case 110 in the axial direction.

In the present embodiment, the bus bar support member 120 is provided to be inserted across the 1 st opening 61i and the 2 nd opening 111a. In this case, when the inverter case 110 is fixed to the case 6, the bus bar support member 120 attached to the inverter case 110 or the case 6 needs to be inserted into the 1 st opening hole 61i or the 2 nd opening hole 111a. For example, in the above embodiment, it is necessary to insert the rear-side end portion of the bus bar support member 120 mounted on the housing 6 into the 2 nd opening hole 111a.

On the other hand, according to the present embodiment, the dimension W1 of the eave portion 113 in the front-rear direction is larger than the distance W2 in the front-rear direction from the end portion on the rear side of the 1 st supporting portion 61g to the end portion on the rear side of the bus bar supporting member 120. Therefore, the eaves 113 can be brought into contact with the 1 st supporting portion 61g in a state where the rear end of the bus bar supporting member 120 is not inserted into the 2 nd opening hole 111a. Thus, as described above, the bus bar support member 120 can be inserted into the 2 nd opening hole 111a in a state where the inverter case 110 is positioned in the vertical direction and the axial direction. Therefore, the bus bar support member 120 can be suppressed from contacting the inner peripheral surface of the 2 nd opening hole 111a. This can suppress deformation of the bus bar support member 120, and can suppress positional displacement of the bus bar 130 supported by the bus bar support member 120. Therefore, the bus bar 130 is insulated from the case 6 and the inverter case 110 by the bus bar support member 120, and the bus bar 130 is easily connected to the inverter 140.

In addition, according to the present embodiment, the 2 nd O-ring 152 as a sealing member disposed between the inner circumferential surface of the 2 nd opening hole 111a and the outer circumferential surface of the bus bar support member 120 is provided. In this case, when the bus bar support member 120 is inserted in a state of being offset from the 2 nd opening hole 111a, the 2 nd O-ring 152 may strongly rub against the inner circumferential surface of the 2 nd opening hole 111a and be damaged. In contrast, according to the present embodiment, as described above, the bus bar support member 120 can be inserted into the No. 2 opening hole 111a in a state where the inverter case 110 is positioned in the vertical direction and the axial direction. Therefore, the 2 nd O-ring 152 is less likely to rub against the inner peripheral surface of the 2 nd opening hole 111a, and breakage of the 2 nd O-ring 152 can be suppressed.

Further, according to the present embodiment, the peripheral wall portion 61a has a shoulder portion 61j protruding rearward, and the 1 st supporting portion 61g is provided on the shoulder portion 61j. Therefore, the 1 st support portion 61g is easily provided at the rear end of the housing 6. This can shorten the dimension W1 of the brim 113 in the front-rear direction. Therefore, the fixing portion of the eave portion 113 to the case 6 can be brought close to the inverter case 110, and the moment due to the self weight of the inverter unit 8 applied to the fixing portion of the eave portion 113 to the case 6 can be reduced. Therefore, the load applied to the inverter case 110 can be reduced, and the inverter unit 8 can be more stably fixed to the case 6. In the present embodiment, the fixing portion of the brim 113 to the housing 6 is a portion of the brim 113 provided with a fixing hole 113a.

In addition, according to the present embodiment, the shoulder portion 61j has the 1 st opening hole 61i, and the 1 st extending portion 131 extends from the inside of the shoulder portion 61j to the inside of the inverter case 110. Therefore, the portion of the housing 6 that accommodates a part of the bus bar 130 therein can be effectively used for positioning the inverter case 110.

In addition, according to the present embodiment, the 1 st supporting portion 61g is provided in the 1 st case member 61 disposed on the right side of the 2 nd case member 62. The eaves 113 is disposed on the right side of the 2 nd case member 62, and the right end is disposed on the left side of the right end of the 1 st case member 61. Therefore, the eaves 113 and the inverter case 110 are easily fixed to only the 1 st case member 61 and the 1 st case member 61, respectively. This can improve the accuracy of positioning the inverter case 110 by the eaves 113, compared to a case where the eaves 113 is fixed across the 1 st and 2

nd case members

61 and 62. Further, since it is not necessary to fix the inverter case 110 to the 2 nd housing member 62, the number of screws or the like for fixing can be reduced, and the number of components of the motor unit 1 can be reduced.

The present invention is not limited to the above embodiment, and other configurations may be adopted. The 2 nd support portion is not particularly limited as long as it can support the positioning member from the right side. The 2 nd support portion may be, for example, a screw hole recessed from the upper surface of the housing toward the lower surface. In this case, the positioning member is a screw member screwed into the screw hole, and the flange portion is brought into contact with the screw member, whereby the inverter case can be positioned in the axial direction. The 2 nd support portion may not be provided. The positioning of the eave in the vertical direction relative to the casing may be performed after the positioning of the eave in the axial direction relative to the casing. That is, the flange may be brought into contact with the positioning member and then brought into contact with the 1 st supporting portion. The 1 st direction and the 2 nd direction may be the same as each other as long as the relative relationship therebetween is the same, and may be directions other than the directions indicated by the names such as the front-back direction, the left-right direction, and the width direction described in the above embodiments in the arrangement and the posture of the actual motor unit.

The above-described structures may be appropriately combined within a range not contradictory to each other.

Description of the reference symbols

1: a motor unit; 2: a motor; 4: a reduction gear; 5: a differential device; 6: a housing; 21: a shaft (motor shaft); 30: a stator; 42: 2 nd gear (intermediate gear); 51: a ring gear; 61: a 1 st housing part; 61a: a peripheral wall portion; 61g: 1 st support part; 61i: 1 st open pore; 61j: a shoulder portion; 62: a 2 nd housing part; 110: an inverter case; 111: an inverter case main body; 111a: 2 nd opening hole; 113: an eave portion; 130: a bus bar; 131: 1 st extension part; 140: an inverter; j4: a medial axis; j5: a differential axis.

Claims

1. A motor unit having:

a motor having a motor shaft extending in a 1 st direction perpendicular to a vertical direction and a stator disposed radially outward of the motor shaft;

a reduction gear connected to the motor and having an intermediate gear that rotates about an intermediate axis;

a differential device connected to the reduction gear device and having a ring gear that rotates about a differential axis;

an inverter that supplies electric power to the motor;

a housing that houses the motor; and

an inverter case fixed to one side of the case in a 2 nd direction perpendicular to both a vertical direction and the 1 st direction, and housing the inverter,

said intermediate axis and said differential axis extending in said 1 st direction,

the inverter case has:

an inverter case body disposed on an upper side of the differential axis in a vertical direction when viewed from the 1 st direction; and

a brim portion protruding from the inverter case main body to the other side in the 2 nd direction,

the housing has a 1 st support part which is contacted with the brim part from the lower side in the vertical direction and supports the brim part,

the end portion of the inverter case on the upper side is located on the lower side in the vertical direction than the end portion of the case on the upper side.

2. The motor unit according to claim 1,

the housing has a cylindrical peripheral wall portion surrounding the motor from outside in a radial direction of the motor shaft,

the peripheral wall portion has a shoulder portion protruding toward the 2 nd direction side,

the 1 st support portion is provided to the shoulder portion.

3. The motor unit according to claim 2,

the motor unit further has a bus bar electrically connecting the stator and the inverter,

the shoulder portion has a 1 st opening hole opened to the 2 nd direction side,

the inverter case main body has a 2 nd opening hole that opens to the other side in the 2 nd direction,

the 2 nd aperture is opposed to the 1 st aperture in the 2 nd direction,

the bus bar has a 1 st extension portion that extends from an interior of the shoulder portion to an interior of the inverter case via the 1 st opening hole and the 2 nd opening hole.

4. The motor unit according to any one of claims 1 to 3,

the housing has:

a 1 st housing member that houses the motor; and

a 2 nd housing member that houses the reduction gear and the differential gear,

the 1 st housing part is disposed on the 1 st direction side of the 2 nd housing part,

the 1 st supporting portion is provided on the 1 st housing part,

the brim is disposed on the 1 st direction side of the 2 nd shell member,

an end of the eave portion on one side in the 1 st direction is located on the other side in the 1 st direction than an end of the 1 st shell member on one side in the 1 st direction.