WO2019131420A1

WO2019131420A1 - Motor unit and motor unit manufacturing method

Info

Publication number: WO2019131420A1
Application number: PCT/JP2018/046953
Authority: WO
Inventors: 慶介福永; 勇樹石川; 修平中松
Original assignee: 日本電産株式会社
Priority date: 2017-12-28
Filing date: 2018-12-20
Publication date: 2019-07-04
Also published as: CN111527678B; CN111527678A

Abstract

In an embodiment of this motor unit, an inverter case comprises an inverter case body having a second hole, which opens toward another side in a second direction and opposes a first hole in the second direction, and a hood part protruding from the inverter case body toward the other side in the second direction. A busbar has a first extension part extending from the inside of a housing to the inside of the inverter case via the first hole and second hole. The housing has a first support part that comes into contact with and supports the hood part from one side in a third direction orthogonal to the first direction and second direction and a second support part that, in a view from the third direction, is disposed on one side of the first support part in the first direction. The second support part is capable of supporting, from one side in the first direction, a positioning member capable of positioning the hood part in the first direction. In a view from the third direction, there is a gap in the first direction between the end of the hood part on one side thereof in the first direction and the second support part.

Description

Motor unit and method of manufacturing motor unit

The present invention relates to a motor unit and a method of manufacturing the motor unit.

A motor drive unit is known in which an inverter case is fixed to a housing. For example, Japanese Patent Laid-Open Publication No. 2011-10383 describes a motor drive unit in which an inverter case and a housing are fixed by fastening pins.

Japanese Published Gazette: Japanese Patent Laid-Open No. 2011-10383

In the motor drive unit as described above, a conductor electrically connecting the motor and the inverter is passed through a conductor through hole penetrating the housing and the inverter case. In such a configuration, for example, after the inverter case is fixed to the housing, the conductor connected to the motor is connected to the inverter. In this case, when the inverter case is fixed to the housing, the conductor or a member supporting the conductor may come in contact with the conductor through hole, and the position of the conductor may be displaced or the conductor may be deformed. Therefore, there is a problem that it is difficult to connect the conductor to the inverter after the inverter case is fixed to the housing.

An object of the present invention is to provide a motor unit having a structure in which a bus bar can be easily connected to an inverter, and a method of manufacturing a motor unit in which the bus bar can be easily connected to the inverter.

One aspect of the motor unit of the present invention is a motor having a motor shaft extending in a first direction and a stator disposed radially outward of the motor shaft, an inverter for supplying electric power to the motor, and the first direction A housing having a first opening opening in one side in a second direction orthogonal to the housing, the housing accommodating the motor, an inverter case fixed to the one side in the second direction of the housing, and accommodating the inverter; And a bus bar electrically connecting the stator and the inverter. The inverter case has an inverter case main body having an opening on the other side in the second direction and a second opening facing the first opening and the second direction, and an inverter case main body on the other side in the second direction And protruding ridges. The bus bar has a first extension portion extending from the inside of the housing to the inside of the inverter case via the first opening and the second opening. The housing supports the flange portion from one side in a third direction orthogonal to both the first direction and the second direction, and a first support portion that contacts and supports the flange portion, and the third direction as viewed from the third direction. And a second support portion disposed on one side in the first direction of the first support portion. The second support portion can support a positioning member capable of positioning the collar portion in the first direction from one side in the first direction. When viewed from the third direction, a gap is provided between the first direction of the one end of the ridge in the first direction and the first direction of the second support.

One aspect of a method of manufacturing a motor unit according to the present invention includes a motor having a motor shaft extending in a first direction and a stator disposed radially outward of the motor shaft, an inverter for supplying power to the motor, and An inverter case having a first opening that opens to one side in a second direction orthogonal to the first direction, a housing that accommodates the motor, and one side fixed to the second direction of the housing and accommodating the inverter A method of manufacturing a motor unit, comprising: a bus bar electrically connecting the stator and the inverter, including a fixing step of fixing the inverter case to the housing. The inverter case has an inverter case main body having an opening on the other side in the second direction and a second opening facing the first opening and the second direction, and an inverter case main body on the other side in the second direction And protruding ridges. The bus bar has a first extension portion extending from the inside of the housing to the inside of the inverter case via the first opening and the second opening. The housing supports the flange portion from one side in a third direction orthogonal to both the first direction and the second direction, and a first support portion that contacts and supports the flange portion, and the third direction as viewed from the third direction. And a second support portion disposed on one side in the first direction of the first support portion. In the fixing step, the positioning member is supported on the second support portion from the one side in the first direction and attached to the housing, and the flange portion is in contact with the first support portion from the other side in the third direction. Positioning in the third direction, positioning the collar in contact with the positioning member from the other side in the first direction, and positioning the collar in the third direction and the third direction. After positioning in the first direction, the inverter case is moved to the other side in the second direction to be brought into contact with the housing and positioned in the second direction, and after positioning the inverter case in the second direction Fixing the inverter case and the housing and removing the positioning member after fixing the inverter case and the housing , Including the.

According to one aspect of the present invention, a motor unit having a structure in which a bus bar can be easily connected to an inverter, and a method of manufacturing a motor unit in which a bus bar can be easily connected to an inverter are provided.

FIG. 1 is a conceptual view of a motor unit according to one embodiment. FIG. 2 is a perspective view of a motor unit according to an embodiment. FIG. 3 is a schematic side view of a motor unit according to an embodiment. FIG. 4 is an exploded view of the housing of one embodiment. FIG. 5 is a side view of the motor unit of one embodiment. FIG. 6 is a bottom view of the motor unit according to the embodiment as viewed from below. 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 one embodiment. FIG. 9 is a cross-sectional view showing a part of a motor unit according to an embodiment. FIG. 10 is a schematic view showing a part of the mounting procedure of the inverter unit of one embodiment. FIG. 11 is a schematic view showing a part of the attachment procedure of the inverter unit of one embodiment. FIG. 12 is a schematic view showing a part of the attachment procedure of the inverter unit according to one embodiment.

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 and described based on the positional relationship when the motor unit 1 is mounted on a vehicle located on a horizontal road surface. In the drawings, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (that is, the vertical direction), the + Z direction is the upper side (opposite the gravity direction), and the -Z direction is the lower side (gravity direction). The X-axis direction is a direction orthogonal to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted. The + X direction is the vehicle front, and the −X direction is the vehicle rear. However, the + X direction may be the rear of the vehicle and the −X direction may be the front of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle, the + Y direction is the vehicle left, and the -Y direction is the vehicle right It is. However, when the + X direction is the rear of the vehicle, the + Y direction may be the right of the vehicle and the −Y direction may be the left of the vehicle.

Unless otherwise noted in the following description, the direction (Y-axis direction) parallel to the motor axis J2 of the motor 2 is simply referred to as “axial direction”, and the radial direction centered on the motor axis J2 is simply referred to as “radial direction”. The circumferential direction around the motor axis J2, that is, around the axis of the motor axis J2, is simply referred to as "circumferential direction". However, the above-mentioned "parallel direction" also includes a substantially parallel direction. In addition, a direction parallel to the X-axis direction is referred to as “front-rear direction”. The positive side in the X-axis direction is called "front side", and the negative side in the X-axis direction is called "rear side". The positive side in the Y-axis direction is called "left side", and the negative side in the Y-axis direction is called "right side".

In the present embodiment, the axial direction, that is, the width direction of the vehicle corresponds to the first direction. The front-rear direction corresponds to the second direction. The vertical direction corresponds to the third direction. The left side corresponds to one side in the first direction, and the right side corresponds to the other side in the first direction. The rear side corresponds to one side in the second direction, and the front side corresponds to the other side in the second direction. The lower side corresponds to one side in the third direction, and the upper side corresponds to the other side in the third direction.

Hereinafter, a motor unit (electric drive device) 1 according to an exemplary embodiment of the present invention will be described based on the drawings.
FIG. 1 is a conceptual view of a motor unit 1 according to an embodiment. FIG. 2 is a perspective view of the motor unit 1. In addition, FIG. 1 is a conceptual diagram to the last, and arrangement | positioning and the dimension of each part are not necessarily the same as actual.

The motor unit 1 is mounted on a vehicle having a motor as a power source such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and used as the power source.

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

As shown in FIG. 1, the motor 2 includes a rotor 20 rotating around a motor axis J 2 extending in the horizontal direction, and a stator 30 located radially outward of the rotor 20. An interior of the housing 6 is provided with an accommodation space 80 for accommodating the motor 2 and the gear portion 3. That is, the housing 6 accommodates the motor 2 and the gear portion 3. The housing space 80 is divided into a motor chamber 81 for housing the motor 2 and a gear chamber 82 for housing the gear portion 3.

<Motor>
The motor 2 is accommodated in a motor chamber 81 of the housing 6. The motor 2 includes a rotor 20 rotating around a motor axis J 2 extending in the horizontal direction, and a stator 30 located radially outward of the rotor 20. The motor 2 is an inner rotor type motor including a stator 30 and a rotor 20 rotatably disposed inside the stator 30.

The rotor 20 rotates by supplying power to the stator 30 from a battery (not shown). The rotor 20 has 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 horizontally extending motor axis J2. The torque of the rotor 20 is transmitted to the gear portion 3.

The shaft 21 extends around a motor axis J2 extending in the horizontal direction and the width direction of the vehicle. The shaft 21 rotates about the motor axis J2. The shaft 21 is a hollow shaft provided with a hollow portion 22 having an inner circumferential surface extending along the motor axis J2.

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. A first gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.

The rotor core 24 is configured by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending along the axial direction. A plurality of rotor magnets (not shown) are fixed to the rotor core 24. The plurality of rotor magnets are arranged along the circumferential direction with the magnetic poles alternately.

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 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 by the housing 6. The stator core 32 has a plurality of magnetic pole teeth (not shown) radially inward from the inner circumferential surface of the annular yoke. A coil wire is wound around the pole teeth. The coil wire wound around the pole teeth constitutes a 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 31 a protruding from the axial end surface of the stator core 32. The coil end 31 a protrudes in the axial direction more than the end of the rotor core 24 of the rotor 20. The coil end 31 a protrudes on both sides in the axial direction with respect to the rotor core 24.

<Gear part>
The gear portion 3 is accommodated in a gear chamber 82 of the housing 6. The gear portion 3 is connected to the shaft 21 on one side in the axial direction of the motor shaft J2. The gear portion 3 has a reduction gear 4 and a differential device 5. That is, the motor unit 1 includes the reduction gear 4 and the differential device 5. The torque output from the motor 2 is transmitted to the differential 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 has a function of reducing the rotational speed of the motor 2 and 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 5.

The reduction gear 4 has a first gear (intermediate drive gear) 41, a second gear (intermediate gear) 42, a third gear (filed 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 5 via the shaft 21 of the motor 2, the first gear 41, the second gear 42, the intermediate shaft 45 and the third gear 43. . The gear ratio of each gear, the number of gears, etc. can be variously changed according to the required reduction ratio. The reduction gear 4 is a reduction gear of a parallel axis gear type in which axes of the respective gears are arranged in parallel.

The first gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The first gear 41 rotates with the shaft 21 about the motor axis J2. 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 middle shaft 45 rotates around the middle axis J4. The second gear 42 and the third gear 43 are provided on the outer peripheral surface of the intermediate shaft 45. The second gear 42 and the third gear 43 are connected via an intermediate shaft 45. The second gear 42 and the third gear 43 rotate around the intermediate shaft J4. The second gear 42 meshes with the first gear 41. Thus, the second gear 42 is connected to the motor 2 via the first gear 41. The third gear 43 meshes with the ring gear 51 of the differential device 5. The third gear 43 is located on the side of the partition wall 61 c with respect to the second gear 42. In the present embodiment, the second gear 42 corresponds to an intermediate gear.

<Differential device>
The differential 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 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 transmitting the same torque to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle is turning. The differential 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 extends in the axial direction of the motor axis J2 and rotates around a differential axis J5 parallel to the motor axis J2. Ring gear 51 is connected to 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 through another gear.

(Arrangement of each axis)
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 parallel to one another along the horizontal direction. The intermediate shaft J4 and the differential shaft J5 are located below the motor shaft J2. Therefore, the reduction gear 4 and the differential 5 are located below the motor 2.

A line segment virtually connecting the motor axis J2 and the intermediate axis J4 is a first line segment L1 when viewed from the axial direction of the motor axis J2, and a line segment virtually connecting the intermediate axis J4 and the differential axis J5 Is a second line segment L2, and a line segment that virtually connects the motor axis J2 and the differential axis J5 is a third line segment L3.

The second line segment L2 extends along the substantially horizontal direction. That is, the intermediate shaft J4 and the differential shaft J5 are aligned substantially in the horizontal direction. In the present embodiment, the substantially horizontal direction of the second line segment L2 is a direction within ± 10 ° with respect to the horizontal direction.
An angle α between the second line segment L2 and the third line segment L3 is 30 ° ± 5 °.
The first line segment L1 extends substantially in the vertical direction. That is, the motor shaft J2 and the intermediate shaft J4 are aligned along the substantially vertical direction. In the present embodiment, the substantially vertical direction of the first line segment L1 is a direction within ± 10 ° with respect to the vertical direction.

The length L1 of the first line segment, the length L2 of the second line segment, and the length L3 of the third line segment satisfy the following relationship.
L1: L2: L3 = 1: 1.4 to 1.7: 1.8 to 2.0
Further, the reduction ratio in the reduction mechanism from the motor 2 to the differential 5 is 8 or more and 11 or less. According to this embodiment, a desired gear ratio (8 or more and 11 or less) can be realized while maintaining the positional relationship between the motor shaft J2, the intermediate shaft J4, and the differential shaft J5 as described above.

<Housing>
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 divided into a motor chamber 81 and a gear chamber 82 by a partition wall 61 c. The motor 2 is accommodated in the motor chamber 81. The gear chamber 3 accommodates the gear portion 3 (i.e., the reduction gear 4 and the differential 5).

An oil reservoir P in which oil O is accumulated is provided in a lower region in the accommodation space 80. In the present embodiment, the bottom 81 a of the motor chamber 81 is located above the bottom 82 a of the gear chamber 82. Further, a partition wall opening 68 is provided in the partition wall 61 c that divides the motor chamber 81 and the gear chamber 82. The partition opening 68 brings the motor chamber 81 and the gear chamber 82 into communication with each other. The partition opening 68 moves the oil O accumulated in the lower region in the motor chamber 81 to the gear chamber 82.

A part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is scooped up by the operation of the differential device 5 and a portion is supplied to the first oil passage 91 and a portion is diffused into the gear chamber 82. The oil O diffused to 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 spreads the oil O on the tooth surfaces of the gears. The oil O used in the reduction gear 4 and the differential device 5 drips and is collected in an oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is such that part of the bearing of the differential gear 5 is immersed in the oil O when the motor unit 1 is stopped.

As shown in FIG. 2, the housing 6 has a first housing member 61, a second housing member 62, and a closing portion 63. The second housing member 62 is located on the left side (+ Y direction) of the first housing member 61. The closing portion 63 is located on the right side (−Y direction) with respect to the first housing member 61. The housing 6 may be composed of three or more members.

FIG. 4 is an exploded view of the housing 6.
The first housing member 61 has a cylindrical peripheral wall portion 61 a surrounding the motor 2 from the radial outer side, and a side plate portion 61 b located on one side in the axial direction of the peripheral wall portion 61 a. A space inside the peripheral wall portion 61 a constitutes a motor chamber 81. As shown in FIG. 4, the peripheral wall 61 a has a shoulder 61 j that protrudes rearward on the upper side. The shoulder 61 j is in the form of a substantially rectangular parallelepiped extending in the axial direction. The upper surface of the shoulder 61 j is orthogonal to the vertical direction. The upper end of the shoulder 61 j is part of the upper end of the peripheral wall 61 a.

The shoulder 61 j has a first opening 61 i on the rear surface. That is, the housing 6 has the first opening 61i. The first opening 61i penetrates the rear wall of the shoulder 61j in the front-rear direction, and opens in the rear. When viewed from the rear side, the first opening hole 61i has an elongated circular shape that is long in the axial direction.

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

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

The second housing member 62 is fixed to the side plate portion 61 b of the first housing member 61. The shape of the second housing member 62 is a concave shape that opens to the side plate portion 61 b side. The opening of the second housing member 62 is covered by the side plate portion 61 b. A space between the second housing member 62 and the side plate portion 61 b constitutes a gear chamber 82 accommodating the gear portion 3. That is, the second housing member 62 accommodates the reduction gear 4 and the differential device 5. The second housing member 62 is provided with a second axle passage hole 62e. The second axle passage hole 62e overlaps the first axle passage hole 61e when viewed in the axial direction.

The peripheral wall portion 61 a of the first housing member 61 and the closing portion 63 constitute a motor chamber 81, surround the motor 2, and accommodate the motor 2. That is, the peripheral wall portion 61a and the closing portion 63 constitute the motor housing portion 6a shown in FIG.
Similarly, the side plate portion 61 b of the first housing member 61 and the second housing member 62 constitute a gear chamber 82, surround the gear portion 3, and accommodate the gear portion 3. That is, the side plate portion 61b and the second housing member 62 constitute the gear housing portion 6b shown in FIG.
As described above, the housing 6 has the motor housing portion 6 a in which the motor chamber 81 housing the motor 2 is provided, and the gear housing portion 6 b in which the 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 FIG. 6, the illustration of the inverter unit 8 is omitted.

As shown in FIGS. 5 and 6, the gear housing portion 6b has a protruding portion 6d that protrudes in the radial direction with respect to the motor housing portion 6a when viewed from the axial direction. In the present embodiment, the overhanging portion 6d projects rearward and downward with respect to the motor housing portion 6a. The overhanging portion 6 d accommodates a part of the gear portion 3. More specifically, a part of the second gear 42 and a part of the ring gear 51 are accommodated inside the overhanging part 6 d.

As shown in FIG. 7, the housing 6 has a first support 61 g and a second support 63 d. In the present embodiment, the first support portion 61 g is provided on the first housing member 61. More specifically, the first support portion 61g is provided on the shoulder portion 61j. The first support 61g is an upper end of the rear end of the shoulder 61j. The upper surface of the first support portion 61g is a first support surface 61h. The first support surface 61 h is a flat surface extending in the axial direction. The first support surface 61 h is orthogonal to the vertical direction. The first support surface 61 h is recessed below the portion of the upper surface of the shoulder 61 j which is located on the front side of the first support surface 61 h. The first support surface 61h extends from the left end of the shoulder 61j to the right end of the shoulder 61j. The right end of the first support surface 61 h is connected to the left surface of the closing portion 63.

The first support portion 61g has a female screw hole 61k which is recessed downward from the first support surface 61h. A plurality of female screw holes 61k are provided along the axial direction. In FIG. 7, three female screw holes 61k are provided, for example.

In the present embodiment, the second support portion 63 d is provided at the closing portion 63. The second support portion 63 d is an upper end portion at the rear end portion of the closing portion main body 63 a. The second support portion 63d protrudes upward beyond the first support portion 61g. The second support portion 63 d is a portion that protrudes to the upper side of the peripheral wall portion 61 a when viewed from the left side. The second support portion 63d is disposed on the right side of the first support portion 61g when viewed in the vertical direction. The left side surface of the second support portion 63d is a second support surface 63e. The second support surface 63e is a flat surface. The second support surface 63e is orthogonal to the axial direction. The right end of the first support surface 61h is connected to the second support surface 63e. The second support portion 63d can support the positioning member MP described later from the right side by the second support surface 63e.

<Oil>
As shown in FIG. 1, the oil O circulates in an oil passage 90 provided in the housing 6. The oil path 90 is a path of oil O which supplies the oil O from the oil reservoir P to the motor 2.
The oil O is used to lubricate the reduction gear 4 and the differential gear 5. The oil O is also used for cooling the motor 2. The oil O accumulates in the lower region (i.e., oil reservoir P) in the gear chamber 82. Since the oil O exhibits the functions of a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to a low viscosity lubricating oil for automatic transmission (ATF: Automatic Transmission Fluid).

<Oil path>
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 straddle the motor chamber 81 and the gear chamber 82 of the accommodation space 80. The oil passage 90 is a path of oil O that guides the oil O from the oil reservoir P on the lower side of the motor 2 (that is, the lower region in the accommodation space 80) through the motor 2 to the oil reservoir P on the lower side of the motor 2 again. It is.

In the present specification, the “oil passage” means a passage of oil O circulating in the storage space 80. Therefore, the "oil path" is not only a "flow path" that forms a steady flow of oil in one direction in a steady manner, but also a path (for example, a reservoir) for temporarily retaining oil and dripping oil It is a concept that also includes the route.

The oil passage 90 has a first oil passage 91 passing through the inside of the motor 2 and a second 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 first oil passage 91 and the second oil passage 92.

The first oil passage 91 and the second oil passage 92 are paths for supplying the oil O from the oil reservoir P to the motor 2 and recovering the oil O in the oil reservoir P again. In the first oil passage 91 and the second oil passage 92, the oil O drips from the motor 2 and accumulates in the lower region in the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68. That is, the first oil passage 91 and the second oil passage 92 include paths for moving the oil O from the lower region in the motor chamber 81 to the lower region in the gear chamber 82.

(First oil path)
As shown in FIG. 1, in the first oil passage 91, the oil O is scooped up from the oil reservoir P by the differential device 5 and guided to the inside of the rotor 20. The oil O is given a centrifugal force associated with the rotation of the rotor 20 inside the rotor 20. Thus, the oil O is uniformly diffused toward the stator 30 surrounding the rotor 20 from the radial outer side, and cools the stator 30.

The first oil passage 91 has a scraping path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. In addition, in the path of the first oil passage 91, a first reservoir 93 is provided. The first reservoir 93 is provided in the gear chamber 82.

The scraping path 91 a is a path for scraping 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 in the first reservoir 93. As shown in FIG. 3, the first reservoir 93 is disposed between the intermediate shaft J4 and the differential shaft J5. The first reservoir 93 opens upward. The first reservoir 93 receives the oil O picked up by the ring gear 51. Further, when the liquid level of the oil reservoir P is high immediately after the motor 2 is driven, etc., the oil stored in the first reservoir 93 is scraped up by the second gear 42 and the third gear 43 in addition to the ring gear 51. O also receive.

The shaft supply path 91 b guides the oil O from the first reservoir 93 to the motor 2. The shaft supply path 91 b is constituted by a hole 94 provided in the second housing member 62. The shaft inner path 91 c is a path through which the oil O passes in the hollow portion 22 of the shaft 21. The rotor inner path 91 d is a path that passes through the inside of the rotor core 24 from the communication hole 23 of the shaft 21 and scatters to the stator 30.

In the shaft inner path 91 c, centrifugal force is applied to the oil O inside the rotor 20 as the rotor 20 rotates. As a result, the oil O continuously splashes radially outward from the rotor 20. Further, as the oil O scatters, the path inside the rotor 20 becomes negative pressure, and the oil O accumulated in the first reservoir 93 is drawn into the rotor 20 and the path inside the rotor 20 is filled with the oil O.

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

(Second oil path)
As shown in FIG. 1, the oil O is pulled up from the oil reservoir P to the upper side of the motor 2 in the second oil passage 92 and supplied to the motor 2. The oil O supplied to the motor 2 takes heat from the stator 30 while cooling along the outer peripheral surface of the stator 30 to cool the motor 2. The oil O transmitted along the outer peripheral surface of the stator 30 drips downward and accumulates in the lower region in the motor chamber 81. The oil O of the second oil passage 92 merges with the oil O of the first oil passage 91 in the lower region of the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68.

The second oil passage 92 has a first flow passage 92a, a second flow passage 92b, and a third flow passage 92c. In the path of the second oil passage 92, a pump 96, a cooler 97, and a second reservoir 98 are provided. The pump 96 supplies oil O to the motor 2. The cooler 97 also cools the oil O passing through the second oil passage 92. In the second oil passage 92, the oil O passes through each portion in the order of the first passage 92a, the pump 96, the second passage 92b, the cooler 97, the third passage 92c, and the second reservoir 98. And supplied to the motor 2.

The first flow passage 92 a, the second flow passage 92 b and the third flow passage 92 c pass through the wall of the housing 6 surrounding the accommodation space 80. The first flow path 92 a connects the oil reservoir P and the pump 96. The second flow path 92 b connects the pump 96 and the cooler 97. The third flow path 92 c connects the cooler 97 and the storage space 80.

In the present embodiment, the first flow passage 92 a, the second flow passage 92 b, and the third flow passage 92 c pass through the inside of the wall portion of the housing 6 surrounding the accommodation space 80. Therefore, it is not necessary to prepare a pipe separately, which can contribute to the reduction in the number of parts.

The pump 96 is an electric pump driven by electricity. The pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98. Supply to

As shown in FIG. 6, the pump 96 has a pump mechanism 96p, a pump motor 96m, an inlet 96a and an outlet 96b. In the present embodiment, the pump mechanism portion 96p is a trochoidal pump in which an external gear (not shown) and an internal gear mesh with each other and rotate. The internal gear of the pump mechanism 96p is rotated by the pump motor 96m. The gap between the internal gear and the external gear of the pump mechanism portion 96p leads to the suction port 96a and the discharge port 96b.

The suction port 96a of the pump 96 is connected to the first flow passage 92a. Further, the discharge port 96 b of the pump 96 is connected to the second flow path 92 b. The pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98. Supply to

The pump motor 96m rotates the internal gear of the pump mechanism 96p. The rotation axis J6 of the pump motor 96m is parallel to the motor axis J2. The pump 96 having the pump motor 96m tends to be long in the direction of the rotation axis J6. According to the present embodiment, by making the rotation axis J6 of the pump motor 96m parallel to the motor axis J2, it is possible to reduce the size of the motor unit 1 in the radial direction. In addition, by reducing the radial dimension of the motor unit 1, the pump 96 can be easily disposed so as to overlap the overhanging portion 6 d of the housing 6 as viewed from the axial direction. As a result, it is possible to realize a structure in which the motor unit 1 can be easily miniaturized by suppressing an increase in the projected area in the axial direction of the motor unit 1.

The pump 96 is located below the motor chamber 81. The pump 96 is fixed to the surface of the overhang 6 d facing the motor housing 6 a. The suction port 96a of the pump 96 is disposed to face the overhang 6d. The first flow passage 92 a connected to the suction port 96 a of the pump 96 linearly penetrates the wall surface of the overhang portion 6 d in the axial direction and opens in the lower region in the gear chamber 82. That is, the overhanging portion 6 d is provided with a first flow passage 92 a which extends along the axial direction and is connected to the pump 96 from the lower region (i.e., 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 can be easily disposed near the oil reservoir P. As a result, the first flow path 92a connecting the oil reservoir P and the suction port 96a can be shortened. Further, since the distance between the oil reservoir P and the suction port 96a is short, the first flow path 92a can be made a linear flow path. By setting the first flow path 92a as a linear short flow path, pressure loss in the path from the oil reservoir P to the pump 96 can be reduced, and efficient oil O circulation can be realized.

As shown in FIG. 1, the cooler 97 is connected to a first flow passage 92 a and a second flow passage 92 b. The first flow path 92 a and the second flow path 92 b are connected via the internal flow path of the cooler 97. Connected to the cooler 97 is a cooling water pipe 97j that allows the cooling water cooled by a radiator (not shown) to pass. The oil O passing through the inside of the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe 97j. An inverter unit 8 is provided in the 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 portion 6 a facing the radially outer side on the lower side of 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 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 motor chamber 81 from the installation surface of the cooler 97 via the wall surface of the motor housing 6a. The oil O accumulated in the lower region of the inside can be cooled.

As shown in FIG. 5, the cooler 97 and the pump 96 at least partially overlap the overhanging portion 6 d of the gear housing portion 6 b when viewed in the axial direction. The gear portion 3 is accommodated inside the overhang portion 6 d. The projected area in the axial direction of the overhang portion 6 d is determined depending on 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. For this reason, it is difficult to reduce the projected area in the axial direction of the overhang portion 6d. According to the present embodiment, by arranging the cooler 97 and the pump 96 in the axial direction so as to overlap the overhang portion 6 d, the axial projection area of the motor unit 1 is prevented from being increased by the cooler 97 and the pump 96. it can. As a result, the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.

According to this embodiment, the cooler 97 and the pump 96 at least partially overlap the second gear 42 of the gear portion 3 as viewed in the axial direction. Therefore, even if the projected area of the overhang 6d as viewed in the axial direction is as small as possible along the outline of each gear of the gear portion 3, the cooler 97 and the pump 96 overhang as viewed from the axial direction A configuration overlapping with 6d can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.

According to the present embodiment, the cooler 97 and the pump 96 are located above the lower end of the overhang 6 d. That is, the cooler 97 and the pump 96 do not protrude further downward from the lower end of the overhang 6 d. For this reason, the motor unit 1 can be miniaturized in the vertical direction.

The cooler 97 and the pump 96 are located below the motor chamber 81. The motor unit 1 is disposed, for example, in a hood of a vehicle. Further, in the motor unit 1, the cooler 97 and the pump 96 are projections that project relative to the housing 6. According to the present embodiment, by arranging the cooler 97 and the pump 96 below the motor chamber 81, even if the vehicle collides with the object due to an accident or the like, the cooler 97 and the pump 96, which are protrusions, can be provided. However, it is possible to suppress sticking to 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. For this reason, as compared with the case where the pump 96 and the cooler 97 are fixed to a structure outside the housing 6, the motor unit 1 can be reduced in size. In addition, the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6, whereby the first flow passage 92a, the second flow passage 92b and the third flow passage 92c passing through the wall of the housing 6 Thus, a flow path connecting the housing space 80, the pump 96 and the cooler 97 can be configured.

As shown in FIG. 6, according to the present embodiment, the position of the pump 96 in the axial direction and the position of the cooler 97 overlap each other. The cooler 97 and the pump 96 are connected via the second flow path 92b. That is, the second oil passage 92 is provided with a second flow passage 92 b connecting the pump 96 and the cooler 97. According to the present embodiment, the axial positions of the pump 96 and the cooler 97 overlap with each other, so that it is possible to realize a structure in which the second flow path 92b linearly extends in the direction orthogonal to the axial direction. That is, the second flow path 92b can be made a linear short flow path, pressure loss in the path from the pump 96 to the cooler 97 can be reduced, and efficient oil O circulation can be realized.

As shown in FIG. 1, the second reservoir 98 is located in the motor chamber 81 of the accommodation space 80. The second reservoir 98 is located above the motor 2. The second reservoir 98 stores the oil O supplied to the motor chamber 81 via the third flow path 92c. The second reservoir 98 has a plurality of outlets 98a. The oil O accumulated in the second reservoir 98 is supplied to the motor 2 from each outlet 98 a. The oil O flowing out from the outlet 98 a of the second reservoir 98 flows from the upper side to the lower side along the outer peripheral surface of the motor 2 to remove the heat of the motor 2. Thereby, the whole motor 2 can be cooled.

The second reservoir 98 extends along the axial direction. Also, the outlets 98 a of the second reservoir 98 are provided at both axial ends of the second reservoir 98. The outlet 98a is located above the coil end 31a. As a result, it is possible to apply oil O to the coil ends 31 a located at both axial ends of the stator 30 to directly cool the coils 31.

The oil O which has cooled the coil 31 is dropped downward, and is accumulated in the lower region in the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the gear chamber 82 through the partition opening 68 provided in the partition 61 c.

According to the present embodiment, a cooler 97 for cooling the oil O is provided in the path of the second oil passage 92. The oil O passing through the second oil passage 92 and cooled by the cooler 97 merges with the oil O passing through the first oil passage 91 in the oil reservoir P. In the oil reservoir P, the oil O which has passed through the first oil passage 91 and the second oil passage 92 is mixed with each other to perform heat exchange. For this reason, the oil O which is disposed in the path of the second oil passage 92 and has the effect of cooling the cooler 97 can also be exerted on the oil O passing through the first oil passage 91.

<Inverter unit>
Inverter unit 8 is electrically connected to 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, inverter unit 8 is fixed to the outer peripheral surface facing the radially outer side of motor housing 6a.

When viewed in the axial direction, at least a portion of the inverter unit 8 overlaps the overhanging portion 6 d of the gear housing portion 6 b. According to the present embodiment, by arranging the inverter unit 8 so as to overlap the overhang portion 6 d when viewed from the axial direction, it is possible to suppress the increase in the projection area in the axial direction of the motor unit 1 due to the inverter unit 8. . As a result, the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.

According to the present embodiment, at least a portion of the inverter unit 8 overlaps the ring gear 51 of the gear portion 3 when viewed in the axial direction. Therefore, even if the projected area of the overhang 6d viewed in the axial direction is made as small as possible along the outer shape of each gear of the gear portion 3, the inverter unit 8 is not An overlapping configuration can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.

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. For this reason, it is possible to reduce the dimension along the horizontal direction of the motor unit 1 by effectively utilizing the region overlapping with the overhanging portion 6 d when viewed from the axial direction, thereby achieving downsizing of the motor unit 1. it can.

As shown in FIG. 1, a cooling water pipe 97 j extending from a radiator (not shown) is connected to the inverter unit 8. Thereby, the inverter unit 8 can be cooled efficiently. Further, the cooling water flowing through the cooling water pipe 97 j also cools the motor housing portion 6 a which contacts the housing portion via the housing portion of the inverter unit 8.

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

As shown in FIG. 9, the inverter case 110 accommodates the inverter 140. The inverter case 110 is fixed to the rear side of the housing 6. The inverter case 110 is fixed to the housing 6 by, for example, a screw. In the present embodiment, the inverter case 110 is fixed to only the first housing member 61 of the housing 6.

As shown in FIG. 8, the inverter case 110 has an inverter case main body 111, a lid 112, and a collar portion 113. The inverter case main body 111 has a substantially rectangular parallelepiped shape that is long in the axial direction, and has a box shape that opens upward. As shown in FIG. 3, the inverter case main 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 where wasteful space is likely to occur is the arrangement of the inverter unit 8. It can be effectively used as space. Therefore, the entire motor unit 1 can be easily miniaturized.

As shown in FIG. 8, the inverter case main body 111 has a second opening hole 111 a on the front surface. The second opening 111a penetrates the front wall of the inverter case main body 111 in the front-rear direction, and opens in the front. The second opening 111a is in the form of an oval long in the axial direction, as viewed from the front side. As shown in FIG. 9, the second opening hole 111 a faces the first opening hole 61 i in the front-rear direction. In the present embodiment, the first opening hole 61i and the second opening hole 111a entirely overlap with each other when viewed from the axial direction. As shown in FIG. 8, the lid 112 is attached to the upper side of the inverter case main body 111. The lid 112 closes the upper opening of the inverter case main body 111.

The collar portion 113 protrudes from the inverter case main body 111 to the front side. More specifically, the collar portion 113 protrudes forward from a portion on the left side of the upper end portion of the inverter case main body 111. The ridge portion 113 has a plate shape whose plate surface is orthogonal to the vertical direction. The collar 113 extends in the axial direction. As shown in FIG. 10, the dimension W1 in the front-rear direction of the collar 113 is the distance W2 in the front-rear direction from the rear end of the first support 61g to the rear end of the bus bar support member 120 described later. Too big. The distance W2 corresponds to the protrusion length of the bus bar support member 120 from the housing 6 to the rear side.

As shown in FIG. 8, the collar portion 113 has a fixing hole 113 a penetrating the collar portion 113 in the vertical direction. A plurality of fixing holes 113a are provided along the axial direction. For example, three fixing holes 113a are provided in FIG.

As shown in FIG. 2, the collar portion 113 contacts the first support portion 61 g from the upper side. That is, in the vertical direction, the first support 61g contacts and supports the hook 113 from the lower side. The collar portion 113 is fixed to the first support portion 61g by screwing a screw, which is passed through the fixing hole 113a from the upper side, into the female screw hole 61k. The collar portion 113 is disposed on the left side of the second support portion 63 d so as to face the second support portion 63 d via a gap. That is, the second support surface 63 e is axially opposed to the right end of the collar portion 113 with a gap. Thus, a gap is provided between the end portion on the right side of the collar portion 113 and the axial direction of the second support portion 63 d when viewed from the vertical direction.

The collar 113 is disposed on the right side of the second housing member 62. The right end of the collar 113 is located more to the left than the right end of the first housing member 61. The range of the axial position of the collar portion 113 is included in the range of the axial position of the first housing member 61. In the present embodiment, the collar 113 entirely overlaps the first housing member 61 when viewed from the vertical direction.

As shown in FIG. 9, the inverter 140 has a terminal portion 140 a and a circuit board (not shown) on which the terminal portion 140 a is provided. An inverter circuit is provided on the circuit board. The terminal portion 140a has a plate shape in which the plate surface is orthogonal to the vertical direction and extends in the front-rear direction. The terminal portion 140 a is fixed to the upper surface of the base portion 141 inside the inverter case 110.

Motor unit 1 further includes bus bar support member 120, a first O-ring 151, a second O-ring 152, and a bus bar 130. The bus bar support member 120 is a member made of resin that supports the bus bar 130. The bus bar support member 120 is inserted across the first opening hole 61i and the second opening hole 111a, and is fitted to the first opening hole 61i and the second 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 has a columnar shape extending in the front-rear direction. The bus bar support member main body 121 has an oval shape that is long in the axial direction 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 first 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 second opening 111a in the front-rear direction.

The bus bar support member main body 121 has a through hole 121 a penetrating the bus bar support member main body 121 in the front-rear direction. The through hole 121 a is disposed at the center of the bus bar support member main body 121 in the vertical direction. Although illustration is omitted, the through hole 121a has a rectangular shape which is long in the axial direction when viewed from the front and rear direction. The bus bar 130 is passed through the through hole 121a. Although illustration is omitted, a plurality of through holes 121a are provided along the axial direction. In the present embodiment, for example, three through holes 121 a are provided.

The bus bar support member main body 121 has

grooves

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

grooves

123 a and 123 b are annular and provided along one circumference of 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 which is inserted into the first opening 61i. The groove 123 b is provided in a portion of the bus bar support member main body 121 to be inserted into the second opening 111 a.

As shown in FIGS. 7 and 9, the convex portion 122 protrudes from the bus bar support member main body 121 in the vertical direction. The convex portion 122 has a substantially rectangular parallelepiped shape. The convex portion 122 includes a plurality of convex portions 122 projecting upward from the bus bar supporting member main body 121 and a plurality of convex portions 122 projecting downward from the bus bar supporting member main body 121. In the present embodiment, the projections 122 are three projections 122 axially spaced from each other at the upper end of the bus bar support member main body 121 and the lower end of the bus bar support member main body 121. A total of six of the three convex portions 122 spaced apart in the axial direction are provided.

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

As shown in FIG. 9, the convex portion 122 is disposed between the housing 6 and the inverter case 110 in the front-rear direction. The convex portion 122 is sandwiched in a state of being in contact with the housing 6 and the inverter case 110. An end surface of the convex portion 122 facing the front side contacts the housing 6. More specifically, the end surface of the convex portion 122 facing the front side is in contact with the peripheral portion of the first opening 61i in the rear surface of the peripheral wall 61a. Thus, the bus bar support member 120 can be positioned in the front-rear direction with respect to the housing 6.

The rib 122 a contacts the inverter case 110. More specifically, the rib 122 a is in contact with the peripheral portion of the second opening 111 a in the front surface of the inverter case main body 111. The rib 122 a is in a state in which at least one of plastic deformation and elastic deformation has occurred in a state where the convex portion 122 is sandwiched between the housing 6 and the inverter case 110. Therefore, even if an error occurs between the dimensions of the inverter case 110 and the dimensions of the housing 6, the error can be absorbed by the deformation of the rib 122a. Thus, the bus bar support member 120 can be suitably held by the housing 6 and the inverter case 110. Therefore, in the state where inverter case 110 is fixed to housing 6, it is possible to suppress that bus bar support member 120 moves in the front-rear direction.

The first O-ring 151 has an annular shape surrounding the bus bar support member 120 as viewed in the front-rear direction. The first O-ring 151 is disposed between the inner circumferential surface of the first opening 61 i and the portion of the outer circumferential surface of the bus bar support member 120 facing the inner circumferential surface of the first opening 61 i. The first O-ring 151 is in contact with the inner peripheral surface of the first opening 61i and the outer peripheral surface of the bus bar support member 120, and seals between the inner peripheral surface of the first open hole 61i and the outer peripheral surface of the bus bar support 120 Stop. In the present embodiment, the first O-ring 151 is fitted into the groove 123 a and held on the outer peripheral surface of the bus bar support member 120.

The second O-ring 152 has an annular shape surrounding the bus bar support member 120 as viewed in the front-rear direction. The second O-ring 152 is disposed between the inner circumferential surface of the second opening 111 a and the portion of the outer circumferential surface of the bus bar support member 120 facing the inner circumferential surface of the second opening 111 a. The second O-ring 152 contacts the inner peripheral surface of the second opening hole 111 a and the outer peripheral surface of the bus bar support member 120, and seals between the inner peripheral surface of the second opening hole 111 a and the outer peripheral surface of the bus bar support member 120. Stop. In the present embodiment, the second O-ring 152 is fitted in the groove 123 b and held on the outer peripheral surface of the bus bar support member 120. In the present embodiment, the second O-ring 152 corresponds to a seal member.

According to the present embodiment, as described above, since the bus bar support member 120 can be suppressed from moving in the front-rear direction, the first O-ring 151 and the second O-ring 152 may be rubbed against the inner peripheral surfaces of the respective opening holes to be damaged. It can be suppressed.

The bus bar 130 is a plate-like metal member. The bus bar 130 has a first extending portion 131 and a second extending portion 132. The first extending portion 131 extends in the front-rear direction. The first extending portion 131 has a plate shape whose plate surface is orthogonal to the vertical direction. The first extending portion 131 extends from the inside of the housing 6 to the inside of the inverter case 110 via the first opening hole 61i and the second opening hole 111a. More specifically, the first extending portion 131 extends from the inside of the shoulder 61 j to the inside of the inverter case 110 via the first opening 61 i and the second opening 111 a. The distance in the front-rear direction between the rear end of the first extending portion 131 and the rear end of the first support portion 61g is larger than the dimension W1 of the collar 113 in the front-rear direction.

The first extending portion 131 passes through the through hole 121 a and penetrates the bus bar support member 120 in the front-rear direction. Thus, the bus bar 130 can be prevented from being in contact with the inner peripheral surface of the first opening 61i and the inner peripheral surface of the second opening 111 a by the bus bar support member 120. Therefore, bus bar 130 can be arranged so as to be insulated from housing 6 and inverter case 110. The first extending portion 131 is fitted in the through hole 121 a. The first extending portion 131 is fixed to the inside of the through hole 121 a by the sealing material filled in the inside of the through hole 121 a. Thereby, the first 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, the movement of the bus bar support member 120 in the front-rear direction can be suppressed, so that the fixation between the first extension portion 131 and the bus bar support member 120 can be suppressed.

As shown in FIG. 7, the first extending portion 131 has a fixing hole 131 a penetrating the first extending portion 131 in the vertical direction. The fixing hole 131 a is provided at the rear end of the first extending portion 131. As shown in FIG. 9, the rear end of the first extending portion 131 is fixed to the terminal portion 140 a inside the inverter case 110. More specifically, the rear end portion of the first extension portion 131 is screwed into the female screw hole provided in the base portion 141 by the screw member 160 passing from the upper side to the fixing hole 131 a and the terminal portion 140 a It is fixed to The first extending portion 131 and the terminal portion 140 a are collectively fixed to the base portion 141 by the screw member 160. The lower surface of the first extending portion 131 is in contact with the upper surface of the terminal portion 140a. Thus, the bus bar 130 is electrically connected to the inverter 140.

The second extending portion 132 extends upward from the front end of the first extending portion 131 in the housing 6. The second extending portion 132 has a plate shape whose plate surface is orthogonal to the front-rear direction. The second extending portion 132 extends above the first opening 61i. Although not shown, the second extension portion 132 is electrically connected to the coil 31. Thus, the bus bar 130 electrically connects the stator 30 and the inverter 140. A current is supplied to stator 30 from inverter 140 via bus bar 130. Thus, the inverter 140 supplies power to the motor 2.

<Parking mechanism>
In the electric vehicle, there is no braking mechanism for applying a brake to the vehicle other than the side brakes, so the motor unit 1 needs the parking mechanism 7.

As shown in FIG. 1, the parking mechanism 7 moves between the teeth of the parking gear 71 fixed to the intermediate shaft 45 and rotating around the intermediate shaft J4 with the intermediate shaft 45 and rotates the parking gear 71. It has the rotation prevention part 72 to block, and the parking motor 73 which drives the rotation prevention part 72. FIG. During the operation of motor 2, rotation prevention unit 72 retracts from parking gear 71. On the other hand, when the shift lever is at the parking position, the parking motor 73 moves the rotation preventing portion 72 between the teeth of the parking gear 71 to prevent 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 worker passes the first extending portion 131 projecting to the outside of the housing 6 through the first opening hole 61i to the through hole 121a, and the bus bar support member 120 from the outside of the housing 6 the first opening hole. Insert in 61i and fit. At this time, the bus bar support member 120 is in a state where the first O-ring 151 and the second O-ring 152 are attached. The operator pushes the bus bar support member 120 into the first opening 61i until the front end surface of the convex portion 122 contacts the housing 6. Thus, the bus bar support member 120 is attached to the housing 6 in the front-rear direction.

Next, in the fixing step, as shown in FIG. 10, the operator roughly positions the vertical direction position and the axial direction position of the inverter unit 8 with respect to the housing 6 and brings the inverter unit 8 closer to the housing 6 from the rear side. At this time, the worker sets the position of the inverter unit 8 in the vertical direction to a position where the vertical position of the flange portion 113 is above the first support portion 61g. The worker moves the inverter unit 8 to the front side until the front end of the collar portion 113 is located above the first support 61g. At this time, since the distance from the rear end of the first support 61g to the front end of the first extending portion 131 is larger than the dimension W1 of the collar 113 in the front-rear direction, the first extending portion 131 is The front end of the is inserted into the second opening 111a.

Next, in the fixing step, the worker moves the inverter unit 8 downward until the collar portion 113 contacts the first support surface 61 h of the first support portion 61 g. Thereby, the collar portion 113 is positioned in the vertical direction, and the inverter unit 8 can be positioned in the vertical direction with respect to the housing 6. That is, the fixing step includes positioning the collar 113 in contact with the first support 61g from the upper side and positioning in the vertical direction.

Next, as shown in FIG. 11, the operator moves the inverter unit 8 to the right while sliding the collar portion 113 on the first support surface 61h. Here, the operator attaches the positioning member MP to the housing 6 before moving the inverter unit 8 to the right. The positioning member MP has a plate shape whose plate surface is orthogonal to the axial direction. The operator brings the positioning member MP into contact with the second support surface 63e of the second support portion 63d, and places the positioning member MP on the upper side of the first support portion 61g. That is, the fixing step includes attaching the positioning member MP to the housing 6 with the second support portion 63 d supported from the right side.

With the positioning member MP attached to the housing 6, the operator moves the collar 113 to the right until the right end of the collar 113 contacts the positioning member MP. Thus, the collar portion 113 can be positioned in the axial direction, and the inverter unit 8 can be positioned in the axial direction with respect to the housing 6. That is, the positioning member MP can position the collar portion 113 in the axial direction. Further, the fixing step includes positioning the collar portion 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 to the front side until the inverter case main body 111 and the first housing member 61 contact in the front-rear direction. Thus, the inverter unit 8 can be positioned in the front-rear direction with respect to the housing 6. That is, after the flange portion 113 is positioned in the vertical direction and the axial direction, the fixing step includes moving the inverter case 110 to the front side to contact the housing 6 and positioning 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 that protrudes rearward from the housing 6 is fitted in the second opening 111a. Further, the convex portion 122 described above is sandwiched between the inverter case main body 111 and the first housing member 61, and the rib 122a is plastically or elastically deformed, or plastically deformed and elastically deformed.

As described above, the operator can position the inverter unit 8 in the vertical direction, the axial direction, and the front-rear direction with respect to the housing 6. After positioning the inverter unit 8, the operator fixes the inverter case 110 to the housing 6 with a screw. More specifically, the operator passes a screw from the upper side to the fixing hole 113a and tightens the female screw hole 61k to fix the collar 113 to the first support 61g. Although not shown, the operator fixes the inverter case 110 to the housing 6 by tightening a screw in the front-rear direction. As described above, the fixing step includes fixing the inverter case 110 and the housing 6 after the inverter case 110 is positioned in the front-rear direction.

Thereafter, 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 housing 6. Thereby, a gap is provided between the second support portion 63 d and the collar 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 collar 113. Therefore, even when the inverter unit 8 is disposed at a position adjacent to the housing 6 in the front-rear direction, when the inverter case 110 is fixed to the housing 6, the flange portion 113 is used as the first support portion of the housing 6 It can be hooked from the top to 61 g. Thus, the inverter case 110 can be positioned in the vertical direction with respect to the housing 6, and the inverter case 110 can be supported by the housing 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 miniaturized in the vertical direction.

Further, as described above, since the inverter case main body 111 is disposed on the upper side of the differential shaft J5 when viewed from the axial direction, the inverter case 110 can be disposed space efficiently with respect to the housing 6, and the motor unit 1 is further miniaturized. It is easy to As described above, according to the present embodiment, it is possible to obtain the motor unit 1 that can be miniaturized and has a structure that facilitates fixing the inverter case 110 to the housing 6.

Further, according to the present embodiment, the second support portion 63 d capable of supporting the positioning member MP from the right side is disposed on the right side of the collar portion 113. Therefore, by supporting the positioning member MP on the second support portion 63d, the flange portion 113 can be brought into contact with the positioning member MP, and the inverter case 110 can be positioned in the axial direction. Thereby, the inverter case 110 can be closely approached with respect to the housing 6 in the front-rear direction in the state positioned in the vertical direction and in both the axial directions. Therefore, when the inverter case 110 is fixed to the housing 6, the attitude of the inverter case 110 can be stabilized, and the bus bar passes through the first opening 61i of the housing 6 and the second opening 111a of the inverter case 110. It can suppress that 130 touches the inner skin of each opening. Therefore, deformation of bus bar 130 can be suppressed, and inverter case 110 can be accurately positioned on housing 6. As a result, the bus bar 130 and the inverter 140 can be arranged with relative position accuracy. As described above, according to the present embodiment, the motor unit 1 having a structure in which the bus bar 130 can be easily connected to the inverter 140 can be obtained.

Further, according to the present embodiment, after fixing the inverter case 110 to the housing 6, the flange portion 113 and the second support portion 63d can be removed by removing the positioning member MP used when positioning the inverter case 110 in the axial direction. A gap can be provided between the As described above, by arranging the collar portion 113 and the second support portion 63 d with a gap, when the motor unit 1 is vibrated, the collar portion 113 and the second support portion 63 d rub against each other. Can be suppressed.

Further, according to the present embodiment, the second support portion 63d has a second support surface 63e axially opposed to the right end portion of the collar portion 113 with a gap. Therefore, it is easy to support the positioning member MP on the second support surface 63e. Further, since the second support surface 63e is a flat surface, the positioning member MP can be accurately disposed with respect to the second support portion 63d, and the positioning accuracy of the inverter case 110 can be improved.

Further, according to the present embodiment, the first support surface 61 h which is the upper surface of the first support portion 61 g is a flat surface extending in the axial direction. Therefore, after bringing the collar portion 113 into contact with the first support surface 61 h, it is easy to move the inverter case 110 while sliding it in the axial direction. Thus, the inverter case 110 can be easily positioned in the axial direction.

Further, in the present embodiment, the bus bar support member 120 inserted across the first opening hole 61i and the second opening hole 111a is provided. In such a case, when the inverter case 110 is fixed to the housing 6, it is necessary to insert the bus bar support member 120 attached to the inverter case 110 or the housing 6 into the first opening 61i or the second opening 111a. . For example, in the embodiment described above, the rear end of the bus bar support member 120 attached to the housing 6 needs to be inserted into the second opening 111a.

On the other hand, according to the present embodiment, the dimension W1 in the front-rear direction of the collar portion 113 is the front-rear direction from the rear end of the first support 61g to the rear end of the bus bar support member 120. It is larger than the distance W2. Therefore, the flange portion 113 can be brought into contact with the first support portion 61g in a state where the rear end of the bus bar support member 120 is not inserted into the second opening 111a. Thus, as described above, the bus bar support member 120 can be inserted into the second opening 111 a in a state where the inverter case 110 is positioned in the vertical direction and in the axial direction. Therefore, it can be suppressed that the bus bar support member 120 contacts the inner peripheral surface of the second opening 111a. Thereby, deformation of bus bar support member 120 can be suppressed, and displacement of the position of bus bar 130 supported by bus bar support member 120 can be suppressed. Therefore, the bus bar 130 can be easily connected to the inverter 140 while the bus bar 130 is insulated from the housing 6 and the inverter case 110 by the bus bar support member 120.

Further, according to the present embodiment, the second O-ring 152 as a seal member disposed between the inner peripheral surface of the second opening hole 111 a and the outer peripheral surface of the bus bar support member 120 is provided. In this case, if the bus bar support member 120 is inserted into the second opening 111a with a gap, the second O-ring 152 may be strongly rubbed against the inner peripheral surface of the second opening 111a and may be damaged. On the other hand, according to the present embodiment, as described above, the bus bar support member 120 can be inserted into the second opening 111 a in a state where the inverter case 110 is positioned in the vertical direction and in the axial direction. Therefore, the second O-ring 152 is not easily rubbed against the inner peripheral surface of the second opening 111a, and the breakage of the second O-ring 152 can be suppressed.

Further, according to the present embodiment, the peripheral wall 61a has a shoulder 61j protruding to the rear side, and the first support 61g is provided on the shoulder 61j. Therefore, it is easy to provide the first support portion 61 g at the rear end of the housing 6. Thereby, the dimension W1 of the front-back direction of the collar part 113 can be shortened. Therefore, the portion fixed to the housing 6 in the collar 113 can be brought closer to the inverter case 110, and the moment due to the weight of the inverter unit 8 applied to the portion fixed to the housing 6 in the collar 113 can be reduced. Therefore, the load applied to the inverter case 110 can be reduced, and the inverter unit 8 can be fixed to the housing 6 more stably. In the present embodiment, the portion fixed to the housing 6 in the collar portion 113 is a portion of the collar portion 113 where the fixing hole 113 a is provided.

Further, according to the present embodiment, the shoulder 61j has the first opening 61i, and the first extension 131 extends from the inside of the shoulder 61j to the inside of the inverter case 110. Therefore, the portion of the housing 6 in which a part of the bus bar 130 is accommodated can be effectively used for positioning of the inverter case 110.

Further, according to the present embodiment, the first support portion 61 g is provided to the first housing member 61 disposed on the right side of the second housing member 62. In addition, the collar portion 113 is disposed on the right side of the second housing member 62, and the right end is disposed on the left side of the right end of the first housing member 61. Therefore, the collar portion 113 can be easily fixed only to the first housing member 61, and the inverter case 110 can be easily fixed to only the first housing member 61. Thus, the positioning accuracy of the inverter case 110 by the collar portion 113 can be improved as compared to the case where the collar portion 113 is fixed across the first housing member 61 and the second housing member 62. Further, since it is not necessary to fix the inverter case 110 to the second housing member 62, the number of screws and the like for fixing can be reduced, and the number of parts of the motor unit 1 can be reduced.

The present invention is not limited to the above-described embodiment, and other configurations can be adopted. The second support is not particularly limited as long as the positioning member can be supported from the right side. The second support may be, for example, a screw hole recessed downward from the upper surface of the housing. In this case, the positioning member is a screw member screwed into the screw hole, and the inverter case can be positioned in the axial direction by bringing the flange into contact with the screw member. The motor shaft, the intermediate shaft and the differential shaft may extend in different directions. The position where the inverter case main body is disposed when viewed in the axial direction may not be on the upper side of the differential shaft. The vertical positioning of the barb with respect to the housing may occur after axial positioning of the barb with respect to the housing. That is, after the collar portion is in contact with the positioning member, it may be in contact with the first support portion. The first direction, the second direction, and the third direction may have the same relative relationship with each other, and in the actual arrangement and posture of the motor unit, the vertical direction, the front-rear direction, the left-right direction, and It may be a direction other than the direction indicated by the name such as the width direction.

Each above-mentioned composition can be combined suitably, as long as it does not contradiction mutually.

DESCRIPTION OF SYMBOLS 1 ... Motor unit, 2 ... Motor, 4 ... Decelerator, 5 ... Differential, 6 ... Housing, 21 ... Shaft (motor shaft), 30 ... Stator, 42 ... 2nd gear (intermediate gear), 51 ... Ring gear , 61: first housing member, 61a: peripheral wall portion, 61g: first support portion, 61i: first opening hole, 61j: shoulder portion, 62: second housing member, 63d: second support portion, 110: 110 Inverter case 111 Inverter body main body 111a Second opening hole 113 Flange portion 120 Busbar supporting member 130 Busbar 131 first extending portion 140 Inverter 152 second O-ring (seal member ), J4 ... intermediate shaft, J5 ... differential shaft, MP ... positioning member

Claims

A motor having a motor shaft extending in a first direction and a stator disposed radially outward of the motor shaft;
An inverter for supplying power to the motor;
A housing having a first opening that opens to one side in a second direction orthogonal to the first direction, the housing accommodating the motor;
An inverter case fixed to one side in the second direction of the housing and accommodating the inverter;
A bus bar electrically connecting the stator and the inverter;
Equipped with
The inverter case is
An inverter case main body having a second opening that opens to the other side in the second direction and that faces the first opening and the second direction;
A ridge projecting from the inverter case main body to the other side in the second direction;
Have
The bus bar has a first extending portion extending from the inside of the housing to the inside of the inverter case through the first opening and the second opening.
The housing is
A first support portion configured to contact and support the flange portion from one side in a third direction orthogonal to both the first direction and the second direction;
A second support portion disposed on one side in the first direction of the first support portion when viewed from the third direction;
Have
The second support portion can support a positioning member capable of positioning the collar portion in the first direction from one side in the first direction,
A motor unit, wherein a gap is provided between the first direction of the one end of the flange in the first direction and the second support as viewed from the third direction.
The second support portion protrudes to the other side in the third direction with respect to the first support portion,
The surface on the other side in the first direction of the second support portion is a flat surface, and faces the end portion on the one side in the first direction of the flange portion in the first direction via a gap. The motor unit according to claim 1.
The motor unit according to claim 1, wherein the surface on the other side in the third direction of the first support portion is a flat surface extending in the first direction.
And a bus bar support member supporting the bus bar,
The bus bar support member is inserted across the first opening and the second opening.
The first extending portion penetrates the bus bar support member in the second direction and is fixed to the bus bar support member.
The dimension of the flange portion in the second direction is the distance in the second direction from the end of the first support portion on one side in the second direction to the end of the bus bar support member on one side in the second direction The motor unit according to any one of claims 1 to 3, which is larger.
A seal member disposed between an inner peripheral surface of the second opening and a portion of the outer peripheral surface of the bus bar support member facing the inner peripheral surface of the second opening;
The motor unit according to claim 4, wherein the seal member has an annular shape surrounding the bus bar support member when viewed from the second direction.
The housing has a cylindrical peripheral wall surrounding the motor from the outside in the radial direction of the motor shaft,
The peripheral wall portion has a shoulder portion projecting to one side in the second direction,
The motor unit according to any one of claims 1 to 5, wherein the first support portion is provided on the shoulder portion.
The shoulder has the first opening,
The motor unit according to claim 6, wherein the first extending portion extends from the inside of the shoulder portion to the inside of the inverter case through the first opening and the second opening.
A reduction gear having an intermediate gear connected to the motor and rotating about an intermediate shaft;
A differential gear having a ring gear connected to the reduction gear and rotating about a differential shaft;
And further
The intermediate shaft and the differential shaft extend in the first direction,
The motor unit according to any one of claims 1 to 7, wherein the inverter case main body is disposed on the other side in the third direction of the differential shaft when viewed from the first direction.
The housing is
A first housing member for housing the motor;
A second housing member for housing the reduction gear and the differential device;
Have
The first housing member is disposed on one side of the second housing member in the first direction,
The first support portion is provided on the first housing member,
The flange portion is disposed on one side in the first direction relative to the second housing member,
9. The motor according to claim 8, wherein an end of the flange in the first direction on one side is positioned on the other side in the first direction than an end of the first housing on the first direction. 10. unit.
A motor having a motor shaft extending in a first direction and a stator disposed radially outward of the motor shaft;
An inverter for supplying power to the motor;
A housing having a first opening that opens to one side in a second direction orthogonal to the first direction, the housing accommodating the motor;
An inverter case fixed to one side in the second direction of the housing and accommodating the inverter;
A bus bar electrically connecting the stator and the inverter;
A method of manufacturing a motor unit comprising
Including a fixing step of fixing the inverter case to the housing;
The inverter case is
An inverter case main body having a second opening that opens to the other side in the second direction and that faces the first opening and the second direction;
A ridge projecting from the inverter case main body to the other side in the second direction;
Have
The bus bar has a first extending portion extending from the inside of the housing to the inside of the inverter case through the first opening and the second opening.
The housing is
A first support portion configured to contact and support the flange portion from one side in a third direction orthogonal to both the first direction and the second direction;
A second support portion disposed on one side in the first direction of the first support portion when viewed from the third direction;
Have
The fixing step is
Supporting the positioning member on the second support portion from the one side in the first direction and attaching the positioning member to the housing;
Positioning the collar in the third direction by bringing the collar into contact with the first support from the other side in the third direction;
Bringing the collar into contact with the positioning member from the other side in the first direction and positioning in the first direction;
After positioning the flange portion in the third direction and the first direction, the inverter case is moved to the other side in the second direction to be in contact with the housing and positioned in the second direction.
Fixing the inverter case and the housing after positioning the inverter case in the second direction;
Removing the positioning member after fixing the inverter case and the housing;
A method of manufacturing a motor unit, including: