CN112075017B

CN112075017B - Motor unit

Info

Publication number: CN112075017B
Application number: CN201980027821.5A
Authority: CN
Inventors: 福永庆介; 宫田阳平
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2018-04-25
Filing date: 2019-04-19
Publication date: 2023-02-03
Anticipated expiration: 2039-04-19
Also published as: CN112075017A; WO2019208448A1

Abstract

One embodiment of a motor unit according to the present invention includes: a motor; an inverter; a bus bar connecting the motor and the inverter, having a portion extending in a 1 st direction; an inverter case having a 1 st opening hole through which a bus bar passes; a housing which houses the motor, and has a 2 nd opening hole opposed to the 1 st opening hole in the 1 st direction, the bus bar passing through the 2 nd opening hole; a 1 st connecting member made of resin, attached to the inverter case, for closing the 1 st opening hole and supporting the bus bar; a 2 nd connecting member made of resin, attached to the housing, and having a guide tube portion inserted into the 2 nd opening hole; a 1 st seal portion that is in contact with the inverter case and the 1 st coupling member in a 1 st direction; a 2 nd sealing part which contacts with the housing and the 2 nd connecting component in the 1 st direction; and a 3 rd seal portion which is in contact with an inner peripheral surface of the guide cylinder portion and an outer peripheral surface of an insertion portion of the 1 st coupling member inserted into the guide cylinder portion.

Description

Motor unit

Technical Field

The present invention relates to a motor unit and a method of manufacturing the motor unit. The present application claims priority based on japanese patent application No. 2018-084485, filed on 25/04/2018, the contents of which are incorporated herein by reference.

Background

Conventionally, a motor unit having a motor, an inverter, a bus bar, a housing, and an inverter case is known. The inverter supplies electric power to the motor. The bus bar connects the motor and the inverter. The housing houses the motor. The inverter case houses the inverter. Patent document 1 describes an electrical connection structure between an inverter that supplies electric power to a motor for driving a wheel and a power train that houses the motor.

Documents of the prior art

Patent literature

Patent document 1: japanese laid-open patent publication No. 2013-97946

Disclosure of Invention

Problems to be solved by the invention

For example, a structure may be considered in which opening holes are provided in the wall portions of the case and the inverter case that face each other, and the bus bar is passed through these opening holes. In this structure, there is room for improvement in terms of ease of assembly of the motor unit and securing of sealing performance of the opening hole.

In view of the above circumstances, an object of the present invention is to provide a motor unit that can be easily assembled and can ensure the sealing property of an opening hole.

Means for solving the problems

One embodiment of a motor unit according to the present invention includes: a motor; an inverter electrically connected to the motor; a bus bar connecting the motor and the inverter, having a portion extending in a 1 st direction; an inverter case which houses the inverter and has a 1 st opening hole through which the bus bar passes; a housing that houses the motor, and has a 2 nd opening hole that is opposed to the 1 st opening hole in the 1 st direction, the bus bar passing through the 2 nd opening hole; a resin 1 st connecting member attached to the inverter case, closing the 1 st opening hole, and supporting the bus bar; a 2 nd connecting member made of resin, attached to the housing, and having a guide tube portion inserted into the 2 nd opening hole; a 1 st seal portion that is disposed between the inverter case and the 1 st coupling member in the 1 st direction and that is in contact with the inverter case and the 1 st coupling member; a 2 nd seal portion that is disposed between the housing and the 2 nd coupling member in the 1 st direction and that is in contact with the housing and the 2 nd coupling member; and a 3 rd seal portion that contacts an inner peripheral surface of the guide cylinder portion and an outer peripheral surface of an insertion portion of the 1 st coupling member inserted into the guide cylinder portion.

Effects of the invention

According to the motor unit of one embodiment of the present invention, assembly is easy, and sealing performance of the opening hole can be ensured.

Drawings

Fig. 1 is a conceptual diagram of a motor unit of embodiment 1.

Fig. 2 is a schematic side view of the motor unit of embodiment 1.

Fig. 3 is an enlarged sectional view of the section III of fig. 2, showing a cross section perpendicular to the motor axis.

Fig. 4 is a perspective view showing the vicinity of the 1 st coupling member fixed to the inverter case.

Fig. 5 is a perspective view showing the vicinity of the working hole of the housing.

Fig. 6 is a perspective view showing the 1 st coupling member and the 2 nd coupling member in an assembled state.

Fig. 7 is a view of the 1 st coupling member and the 2 nd coupling member in an assembled state as viewed in the 1 st direction.

Fig. 8 is a modification of embodiment 1 shown in fig. 7.

Fig. 9 is a sectional view showing a part of the motor unit of embodiment 2, showing a section perpendicular to the motor axis.

Fig. 10 is a perspective view showing the 1 st coupling member and the bus bar according to embodiment 2.

Fig. 11 is a perspective view showing the 1 st coupling member and the bus bar according to embodiment 2.

Fig. 12 is a perspective view showing a 2 nd coupling member according to embodiment 2.

Fig. 13 is a cross-sectional view showing a bus bar and a wiring member according to a modification of embodiment 2.

Detailed Description

< embodiment 1 >

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 based on the positional relationship when the motor unit 1 is mounted on a vehicle on a horizontal road surface. In addition, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the vertical 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 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 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 indicates 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. That is, regardless of the direction of the X-axis, the + Y direction is one side of the vehicle in the left-right direction, and the-Y direction is the other side of the vehicle in the left-right direction.

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 centering on the motor axis J2 is simply referred to as "radial direction", and a circumferential direction centering on the motor axis J2, that is, a direction around the motor axis J2 is simply referred to as "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction.

A motor unit (electric drive device) 1 according to exemplary embodiment 1 of the present invention will be described. Fig. 1 is a conceptual diagram of a motor unit 1 according to embodiment 1. Fig. 2 is a side view schematically showing the motor unit 1 as viewed from the side of the vehicle. In addition, fig. 1 is a conceptual diagram, and the arrangement and the size of each part are not necessarily the same as those of the actual part.

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 used as a power source thereof.

As shown in fig. 1 to 5, the motor unit 1 of the present embodiment includes a motor (main motor) 2, a gear portion 3, a housing 6, an inverter 7, an inverter case 8, a fixing member 6f, a bus bar 9, a wiring screw portion 18, a cover 17, a 1 st coupling member 10, a nut portion 19, a 2 nd coupling member 14, a 1 st seal portion 11, a 2 nd seal portion 12, a 3 rd seal portion 13, a 1 st screw member 15, and a 2 nd screw member 16. The motor axis J2 of the motor 2 extends in a direction perpendicular to a 1 st direction (X-axis direction in the example of the present embodiment) described later. The motor axis J2 extends in the Y-axis direction.

The motor 2 includes a rotor 20 that rotates about a motor axis J2, and a stator 30 that faces the rotor 20. The stator 30 is radially opposed to the rotor 20. The housing 6 is provided with a housing space 80 for housing 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.

The motor 2 is housed in a motor chamber 81 of the housing 6. The motor 2 includes a rotor 20 and a stator 30 opposed to the rotor 20 from the radially outer side. That is, the stator 30 of the present embodiment is located radially outward of the rotor 20. The motor 2 of the present embodiment is an inner rotor type motor including a stator 30 and a rotor 20 rotatably disposed inside the stator 30.

The rotor 20 is rotated by supplying electric power from a battery, not shown, to the stator 30 via the inverter 7. 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 horizontal direction and in the width direction of the vehicle. The shaft 21 rotates about the motor axis J2. The shaft 21 is a hollow shaft having a hollow portion provided therein, the hollow portion having an inner peripheral surface extending along the motor axis J2.

The shaft 21 extends across a motor chamber 81 and a 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 protruding 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. The plurality of rotor magnets 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. The stator 30 includes a stator core 32, a coil 31, an insulator (not shown) interposed between the stator core 32 and the coil 31, and a wiring member 33 connecting the coil 31 and the bus bar 9. That is, the motor 2 has the wiring member 33. The stator 30 is held by the housing 6. Although not shown, the stator core 32 includes an annular yoke and a plurality of magnetic pole teeth extending radially inward from an inner circumferential surface of the yoke. A coil wire (not shown) is wound between the magnetic pole teeth. The coil wire wound on the magnetic pole teeth constitutes the coil 31. The coil wire is connected to the inverter 7 via the wiring member 33 and the bus bar 9. 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 beyond the end of the rotor core 24 of the rotor 20. The coil ends 31a protrude toward both axial sides with respect to the rotor core 24.

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. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear 4.

The reduction gear 4 is connected to the rotor 20 of the motor 2. The reduction gear 4 has the following functions: the rotation speed of the motor 2 is reduced to increase 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 gear 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 a ring gear (gear) 51 of the differential device 5 via the shaft 21 of the motor 2, 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 a 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 to each other.

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 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. 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 (the other side in the axial direction of the motor axis J2) with respect to the 2 nd gear 42.

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

The ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2. 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. Of the plurality of gears of the gear portion 3, the ring gear 51 has the largest outer diameter.

The motor axis J2, the intermediate axis J4, and the differential axis J5 extend in parallel with each other in the horizontal direction. As shown in fig. 2, the intermediate axis J4 and the differential axis J5 are located on the lower side with respect to the motor axis J2 as viewed in the axial direction of the motor axis J2. Therefore, the reduction gear 4 and the differential gear 5 are located below the motor 2. The position in the vertical direction of the intermediate axis J4 is substantially the same as the position in the vertical direction of the differential axis J5.

However, the position of the differential axis J5 in the vertical direction may be located above the position of the intermediate axis J4 in the vertical direction. In this case, the outer shape of the motor unit 1 in the vertical direction can be suppressed to be more compact. The position of the differential axis J5 in the vertical direction may be lower than the position of the intermediate axis J4 in the vertical direction.

The case 6 is made of metal such as aluminum alloy. Although not shown, the housing 6 is formed by combining a plurality of members. Further, the housing 6 may be formed of one member. As shown in fig. 1, the motor 2 and the gear portion 3 are accommodated in an accommodating 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 by a partition wall 61c into a motor chamber 81 and a gear chamber 82. The motor 2 is accommodated in the motor chamber 81. The gear chamber 82 accommodates the gear portion 3 (i.e., the reduction gear 4 and the differential gear 5).

An oil reservoir P for storing oil O is provided in a lower region of the storage 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. Further, a partition wall opening 68 is provided in a partition wall 61c that partitions the motor chamber 81 and the gear chamber 82. The partition wall opening 68 communicates the motor chamber 81 with the gear chamber 82. The partition wall opening 68 allows the oil O stored in the lower region in the motor chamber 81 to move to the gear chamber 82. 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.

A part of the differential unit 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, and a part of the oil O diffuses into the gear chamber 82. The oil O diffused into 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 spreads over the tooth surfaces of the gears. The oil O used in the reduction gear 4 and the differential gear 5 drips down and is collected in the oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is, for example, such that a part of the bearings of the differential device 5 is immersed in the oil O when the operation of the motor unit 1 is stopped.

The oil O circulates in an oil passage (not shown) provided in the casing 6. The oil passage is a path of oil O that supplies oil O from the oil reservoir P to the motor 2. The oil passage circulates the oil O to cool the motor 2.

The oil O is used to lubricate the reduction gear 4 and the differential 5. The oil O is used to cool 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, in order to realize the functions of a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a low viscosity.

In fig. 1 and 2, the housing 6 has a motor housing portion 6a housing the motor 2 and a gear housing portion 6b housing the gear portion 3. That is, the motor 2 is housed in the housing 6. The motor housing portion 6a is substantially cylindrical with the motor axis J2 as the center.

As shown in fig. 3, the motor housing portion 6a includes: a wall portion 6e facing the inverter case 8; a 2 nd opening 6c penetrating the wall 6e in the X-axis direction; a top wall portion 6h covering an upper side of the motor housing portion 6 a; and a working hole 6j penetrating the top wall 6h in the Z-axis direction. That is, the housing 6 has the 2 nd opening 6c and the working hole 6j.

The 2 nd opening hole 6c is disposed in the wall portion 6e and opens in the X axis direction. The 2 nd opening hole 6c penetrates the wall portion 6e in the substantially radial direction. Although not shown, the 2 nd opening 6c has an oblong shape when viewed in the X-axis direction. The 2 nd opening 6c has an oblong shape extending in the Y axis direction. That is, the opening size (inner size) of the 2 nd opening hole 6c in the Y axis direction is larger than the opening size in the Z axis direction when viewed in the X axis direction.

The working hole 6j is disposed in the top wall 6h and opens in the Z-axis direction. Although not shown, the working hole 6j has an oblong shape when viewed in the Z-axis direction. The working hole 6j has an oblong shape extending in the Y-axis direction. That is, the opening dimension (inner dimension) of the working hole 6j in the Y axis direction is larger than the opening dimension in the X axis direction when viewed in the Z axis direction. A work tool or the like is inserted into the work hole 6j from the outside toward the inside of the housing 6.

As shown in fig. 2, 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 in the axial direction. In the present embodiment, the protruding portion 6d protrudes toward the vehicle rear side and the lower side with respect to the motor housing portion 6 a. The protruding portion 6d accommodates a part of the gear portion 3. Specifically, a part of the 2 nd gear 42, a part of the 3 rd gear 43, and a part of the ring gear 51 are accommodated in the extension portion 6d. The projecting portion 6d is provided with an axle passage hole 61e. The axle passage hole 61e penetrates the projecting portion 6d in the Y-axis direction. As shown in fig. 1, the axle passage holes 61e are provided in a pair of wall portions located at both ends of the projecting portion 6d in the Y-axis direction, respectively. The axle 55 is inserted into the axle passage hole 61e.

The inverter 7 is electrically connected to the motor 2. The inverter 7 supplies electric power to the motor 2. The inverter 7 is electrically connected to the stator 30 via a bus bar 9, and supplies electric power to the stator 30. The inverter 7 controls the current supplied to the motor 2. The inverter 7 has a circuit board and a capacitor.

As shown in fig. 2, the inverter case 8 is a substantially rectangular parallelepiped container. The inverter case 8 is made of metal such as aluminum alloy. However, the inverter case 8 may be made of resin. The inverter 7 is housed in the inverter case 8. The inverter case 8 and the motor housing portion 6a are disposed adjacent to each other in the radial direction of the motor axis J2. The inverter case 8 is adjacent to the motor housing portion 6a in the horizontal direction. The inverter case 8 has a bottomed cylindrical case main body 8d and a case lid portion 8e that closes an upper opening of the case main body 8 d.

As shown in fig. 3, the case body 8d includes a wall 8b facing the motor housing portion 6a, a 1 st opening 8c penetrating the wall 8b in the X-axis direction, and a case lid 8a. That is, the inverter case 8 has the 1 st opening hole 8c.

The 1 st opening hole 8c is disposed in the wall portion 8b and opens in the X-axis direction. The 1 st opening hole 8c penetrates the wall portion 8b in the substantially radial direction. Although not shown, the 1 st opening 8c has an oblong shape when viewed in the X-axis direction. The 1 st opening 8c has an oblong shape extending in the Y-axis direction. That is, the opening size (inner size) of the 1 st opening hole 8c in the Y axis direction is larger than the opening size in the Z axis direction when viewed in the X axis direction.

The 1 st aperture 8c is disposed to face the 2 nd aperture 6c in the 1 st direction (X-axis direction in the present embodiment) described later. That is, the 2 nd aperture 6c and the 1 st aperture 8c face each other in the 1 st direction. In the example of the present embodiment, the shape of the cross section perpendicular to the X axis of the 1 st aperture 8c and the shape of the cross section perpendicular to the X axis of the 2 nd aperture 6c are substantially the same as each other. The shape (contour of the inner periphery) of the 1 st aperture 8c and the shape of the 2 nd aperture 6c substantially match each other when viewed in the X-axis direction.

The case brim 8a is plate-shaped and protrudes from the upper end of the wall 8b in the X-axis direction. In the example of the present embodiment, a plurality of case eaves 8a are provided at equal intervals in the Y-axis direction at the upper end of the wall 8b (see fig. 5). The plate surface of the case brim 8a faces in the Z-axis direction. The case flange 8a is provided with a screw insertion hole 8f penetrating the case flange 8a in the Z-axis direction.

The fixing member 6f is inserted into the screw insertion hole 8f. In the present embodiment, the fixing member 6f is a screw member such as a bolt. The fixing member 6f extends in the Z-axis direction. The fixing member 6f is screwed into the screw hole 6i of the top wall portion 6h of the motor housing portion 6 a. The screw hole 6i is provided in the top wall 6h and is open on the upper side. The fixing member 6f is screwed into the housing 6 in the Z-axis direction. The fixing member 6f is provided in plurality. The fixing members 6f are inserted into a plurality of screw insertion holes 8f arranged at equal intervals in the Y-axis direction. The inverter case 8 is fixed to the case 6 using a fixing member 6f or the like. That is, the fixing member 6f fixes the inverter case 8 and the case 6. The inverter case 8 is fixed to an outer peripheral surface of the motor housing portion 6a facing radially outward.

The bus bar 9 connects the motor 2 and the inverter 7. The bus bar 9 electrically connects the stator 30 and the inverter 7. In the present embodiment, the bus bar 9 has a plate shape. The pair of plate surfaces (front and back surfaces) of the bus bar 9 face the Z-axis direction. The bus bar 9 may be, for example, a rod having a circular cross section. As shown in fig. 4, the bus bar 9 is provided in plurality. The plurality of bus bars 9 are arranged at intervals from each other in a direction perpendicular to the 1 st direction (X-axis direction) described later. In the present embodiment, a plurality of (3) bus bars 9 are arranged in the 3 rd direction (Y-axis direction) described later. The phases of the currents flowing in the 3 bus bars 9 are different from each other. The phase of each current flowing through the 3 bus bars 9 is U-phase, V-phase, or W-phase.

The number of the wiring members 33 of the stator 30 is the same as the number of the bus bars 9, and is plural in the present embodiment.

Although not shown, the plurality of wiring members 33 are arranged at intervals in a direction perpendicular to the 1 st direction (X-axis direction). The wiring members 33 are arranged in 3 in the Y-axis direction. The wiring member 33 is a wiring member of the motor 2. The wiring member 33 is a wiring member separate from the bus bar 9. The wiring member 33 is, for example, a plate-like bus bar. That is, the wiring member 33 has a plate shape. The wiring member 33 is electrically connected to the bus bar 9. The plate surface of the wiring member 33 is in contact with the plate surface of the bus bar 9. That is, the wiring member 33 is in contact with the bus bar 9.

In fig. 3, the bus bar 9 has a 1 st extending portion 9a, a 2 nd extending portion 9b, a through hole 9c, and an end portion 9d. The 1 st extending portion 9a is a portion extending in the 1 st direction in the bus bar 9. The 2 nd extending portion 9b is a portion extending in a direction different from the 1 st direction in the bus bar 9. That is, the bus bar 9 has a portion extending in the 1 st direction and a portion extending in a direction different from the 1 st direction. In addition, "a direction different from the 1 st direction" means a direction intersecting the 1 st direction. In the present embodiment, the 1 st extending portion 9a is provided in a pair spaced apart from each other in the bus bar 9. The 2 nd extension portion 9b is disposed between the pair of 1 st extension portions 9a, and connects the pair of 1 st extension portions 9a. In the present embodiment, the 1 st direction is the X-axis direction. The 1 st extension 9a extends in the X-axis direction. The 2 nd extending portion 9b extends obliquely in the Z-axis direction as it goes in the X-axis direction.

In the following description, the direction from the 1 st opening hole 8c toward the 2 nd opening hole 6c in the 1 st direction is referred to as the 1 st direction side. Specifically, the 1 st direction side is the + X direction. The direction from the 2 nd opening 6c toward the 1 st opening 8c in the 1 st direction is referred to as the 1 st direction other side. Specifically, the other side of the 1 st direction is the-X direction. In addition, the up-down direction in the direction perpendicular to the 1 st direction is referred to as the 2 nd direction. That is, the 2 nd direction is perpendicular to the 1 st direction. The 2 nd direction is the Z-axis direction. In addition, the left-right direction among the directions perpendicular to the 1 st direction is referred to as the 3 rd direction. The 3 rd direction is the Y-axis direction. One of the 1 st, 2 nd and 3 rd directions is perpendicular to the other two directions.

The bus bar 9 passes through the 1 st open hole 8c. The bus bar 9 extends to the inside and outside of the inverter case 8 through the 1 st opening hole 8c. The end portion 9d is an end portion on the 1 st direction side of the bus bar 9. The 1 st direction side end 9d of the bus bar 9 protrudes to the 1 st direction side from the 1 st opening hole 8c. That is, the 1 st direction side end portion 9d of the bus bar 9 is located outside the inverter case 8. The end of the bus bar 9 on the other side in the 1 st direction protrudes to the other side in the 1 st direction from the 1 st opening hole 8c. That is, the end of the bus bar 9 on the other side in the 1 st direction is located inside the inverter case 8. The bus bar 9 is supported by a 1 st coupling member 10 described later. The bus bar 9 is fixed to the inverter case 8 via the 1 st coupling member 10.

The bus bar 9 passes through the No. 2 open hole 6c. The bus bar 9 passes through the 2 nd opening hole 6c in a state of being fixed to the inverter case 8. The bus bar 9 is inserted into the 2 nd opening hole 6c. The bus bar 9 extends to the inside and outside of the motor housing portion 6a (the housing 6) via the 2 nd opening hole 6c. The 1 st direction side end 9d of the bus bar 9 protrudes to the 1 st direction side from the 2 nd opening 6c. That is, the 1 st direction side end 9d of the bus bar 9 is located inside the housing 6. The end portion 9d of the bus bar 9 on the 1 st direction side and the end portion 33b of the wiring member 33 on the 1 st direction side overlap each other in the 2 nd direction (Z-axis direction). The plate surface facing the + Z direction at the 1 st direction end 9d of the bus bar 9 and the plate surface facing the-Z direction at the 1 st direction other end 33b of the wiring member 33 are in contact with each other in the 2 nd direction. That is, the plate surface of the 1 st direction one end 9d of the bus bar 9 and the plate surface of the 1 st direction other end 33b of the wiring member 33 are in contact with each other. In the following description, a direction (+ Z direction) from the 1 st direction one side end portion 9d of the bus bar 9 toward the 1 st direction other side end portion 33b of the wiring member 33 in the 2 nd direction is referred to as a 2 nd direction side, and a direction (-Z direction) from the 1 st direction other side end portion 33b of the wiring member 33 toward the 1 st direction one side end portion 9d of the bus bar 9 is referred to as a 2 nd direction. The other end of the bus bar 9 in the 1 st direction protrudes to the other side in the 1 st direction than the 2 nd opening 6c. That is, the end of the bus bar 9 on the other side in the 1 st direction is located outside the housing 6. The bus bar 9 is inserted into the housing 6 through a 2 nd coupling member 14 described later. The bus bar 9 is inserted into a guide tube portion 14a of the 2 nd coupling member 14, which will be described later.

In the example of the present embodiment, when viewed in the direction perpendicular to the 1 st direction, one 1 st extending portion 9a located on the 1 st direction side out of the pair of 1 st extending portions 9a is disposed to overlap the 2 nd opening hole 6c. When viewed in the direction perpendicular to the 1 st direction, the other 1 st extension part 9a and the 2 nd extension part 9b on the other side in the 1 st direction of the pair of 1 st extension parts 9a are disposed to overlap the 1 st opening hole 8c.

The through-hole 9c is formed in the bus bar 9. The through hole 9c penetrates the bus bar 9 in the Z-axis direction, and opens in a pair of plate surfaces of the bus bar 9. The through hole 9c is disposed at the 1 st direction end 9d of the bus bar 9. The through hole 9c is provided in one 1 st extending portion 9a located on the 1 st direction side out of the pair 1 st extending portions 9a.

The through-hole 9c is disposed to overlap with the through-hole 33a of the wiring member 33 when viewed in the Z-axis direction. The wiring screw portion 18 passes through the through hole 9c and the through hole 33a. The wiring screw portion 18 is a screw member extending in the Z-axis direction. The wiring screw portion 18 is screwed into a nut portion 19 described later. The bus bar 9 and the wiring member 33 are sandwiched between the wiring screw portion 18 and the nut portion 19 and fixed to each other in the Z-axis direction. That is, the wiring screw portion 18 connects the bus bar 9 and the wiring member 33 of the motor 2.

The screw axis SA of the wiring screw portion 18 extends in a direction perpendicular to the 1 st direction. Specifically, the screw axis SA extends in the 2 nd direction (Z-axis direction). According to the present embodiment, the bus bar 9 and the wiring member 33 of the motor 2 can be connected without complicating the structure of the bus bar 9. The screw axis SA of the wiring screw portion 18 may extend along the central axis HA of the working hole 6j, which will be described later. In this case, the pair of plate surfaces face the direction of the central axis line HA at the 1 st direction end 9d of the bus bar 9, and the through hole 9c opens in the direction of the central axis line HA. In this case, the wiring screw portion 18 can be stably screwed into the working hole portion 6j by using a working tool or the like.

The fixing member 6f is disposed to overlap the bus bar 9 when viewed in a direction perpendicular to the 1 st direction. Specifically, the fixing member 6f is disposed to overlap the bus bar 9 when viewed in the 2 nd direction (Z-axis direction). One 1 st extending portion 9a located on the 1 st direction side overlaps with the fixing member 6f as viewed in the 2 nd direction.

The working hole 6j of the housing 6 is open toward the bus bar 9. The working hole 6j opens to one 1 st extending portion 9a located on the 1 st direction side of the pair of 1 st extending portions 9a. The working hole 6j opens to the through hole 9c in the housing 6. According to the present embodiment, the wiring screw portion 18 can be inserted from the working hole portion 6j through the through hole 9c of the bus bar 9 and screwed into the nut portion 19 using a working tool or the like, whereby the bus bar 9 and the wiring member 33 can be connected inside the housing 6.

The working hole 6j extends obliquely in the 1 st direction as it extends in a direction perpendicular to the 1 st direction (in the present embodiment, the 2 nd direction). The working hole 6j extends obliquely toward the other side in the 1 st direction as it approaches the bus bar 9 in the direction perpendicular to the 1 st direction (toward the lower side in the present embodiment). That is, the central axis line HA of the working hole 6j extends obliquely in the 1 st direction as it goes in the direction perpendicular to the 1 st direction. The central axis HA extends obliquely toward the other side in the 1 st direction as approaching the bus bar 9 in the direction perpendicular to the 1 st direction.

According to the present embodiment, the inverter case 8 and the housing 6 can be stably fixed by the plurality of fixing members 6f arranged at equal intervals in the 3 rd direction (Y-axis direction). Further, a working tool or the like is inserted into the working hole 6j, and the bus bar 9 and the wiring member 33 of the motor 2 can be connected to each other in the housing 6. That is, since the working hole 6j extends toward the bus bar 9 so as to be inclined with respect to the 2 nd direction, the bus bar 9 and the wiring member 33 can be connected without interfering with the fixed state (fixed strength) of the inverter case 8 and the case 6 by the fixing member 6 f.

Specifically, for example, unlike the present embodiment, when the working hole 6j extends in the 2 nd direction (Z-axis direction), the following problem occurs. The fixing member 6f may not be disposed at a position overlapping the bus bar 9 when viewed in the 2 nd direction. That is, if priority is given to the placement of the working hole 6j, the fixing member 6f cannot be placed at a desired position, and the fixed state between the inverter case 8 and the case 6 may become unstable (fixing strength cannot be secured). Further, if the fixing member 6f is preferentially arranged so as to secure the fixing strength of the inverter case 8 and the housing 6, the work hole 6j and the bus bar 9 have to be arranged so as to be moved to a position not overlapping with the fixing member 6f when viewed in the 2 nd direction. Therefore, the outer shape of the motor unit 1 becomes large in the 3 rd direction (the axial direction of the motor axis J2), and the degree of freedom of component arrangement becomes small. In contrast, according to the present embodiment, the fixing member 6f can be disposed at a desired position, the fixing state of the inverter case 8 and the housing 6 can be stabilized (fixing strength can be secured), the outer shape of the motor unit 1 can be suppressed to be compact, and the degree of freedom in disposing the members can be secured. The bus bar 9 can be connected to the wiring member 33 of the motor 2 through the working hole 6j. In the present embodiment, since the working hole 6j is an inclined hole located on the other side in the 1 st direction as it approaches the bus bar 9 in the 2 nd direction, the working hole 6j is easily disposed in the housing 6.

The lid 17 is plate-shaped. The lid 17 has an oblong shape extending in the 3 rd direction (Y-axis direction) when viewed from the 2 nd direction (Z-axis direction). The lid 17 has an oblong shape with the 3 rd direction as the major axis and the 1 st direction (X-axis direction) as the minor axis when viewed from the 2 nd direction. The lid 17 closes the working hole 6j. The lid 17 is provided on the top wall portion 6h and closes the upper opening of the working hole portion 6j. According to the present embodiment, after the wiring operation of the bus bar 9 is performed through the working hole 6j, the working hole 6j can be closed by the lid 17. The lid 17 can prevent liquid such as water and foreign matter from entering the housing 6 through the working hole 6j and prevent oil O from leaking from the housing 6 to the outside.

The 1 st coupling member 10 is made of resin. The 1 st connecting member 10 is made of PPS resin or the like containing an elastomer component, for example. The 1 st coupling member 10 is constituted by a single member. The 1 st connecting member 10 is made of, for example, a material having substantially the same thermal expansion coefficient (thermal expansion coefficient) as the material of the bus bar 9.

As shown in fig. 3 and 4, the 1 st coupling member 10 is attached to the inverter case 8 and closes the 1 st opening hole 8c. The 1 st coupling member 10 is attached to the wall portion 8b of the case body 8d, and closes the 1 st direction side opening of the 1 st opening hole 8c. The 1 st coupling member 10 is in contact with the inverter case 8 in the 1 st direction. The 1 st coupling member 10 is fixed to the inverter case 8 by a plurality of 1 st screw members 15 described later. That is, the 1 st coupling member 10 is fixed to the inverter case 8 to close the 1 st opening hole 8c. The 1 st coupling member 10 is positioned between the inverter case 8 and the case 6 in the 1 st direction, and is provided in the 1 st opening hole 8c.

As shown in fig. 3, 4, 6, and 7, the 1 st coupling member 10 supports the bus bar 9. In the present embodiment, the 1 st coupling member 10 and a part of the bus bar 9 are insert-molded with resin. The bus bar 9 is fixed to the 1 st coupling member 10. In the 1 st coupling member 10, a plurality of bus bars 9 are provided at intervals from each other in a direction perpendicular to the 1 st direction (the 3 rd direction in the present embodiment). The bus bar 9 is inserted into the 2 nd opening 6c of the housing 6 and connected to the stator 30 of the motor 2.

Here, a method of manufacturing the motor unit 1 of the present embodiment will be described. The method for manufacturing the motor unit 1 includes the steps of: passing the bus bar 9 through the 1 st opening hole 8c of the inverter case 8 housing the inverter 7, and fixing the bus bar 9 to the inverter case 8 in such a manner that a part of the bus bar 9 protrudes from the outer surface of the inverter case 8; inserting a part of the bus bar 9 into the 2 nd opening hole 6c of the housing 6 accommodating the motor 2; and connecting the bus bar 9 and the motor 2 within the housing 6. In the step of fixing the bus bar 9 to the inverter case 8, the 1 st connecting member 10 that supports the bus bar 9 is fixed to the inverter case 8, and the 1 st opening hole 8c is closed by the 1 st connecting member 10. In the present embodiment, in the step of fixing the bus bar 9 to the inverter case 8, a part of the bus bar 9 (a part of the bus bar 9 located on the 1 st direction side) is projected from the wall portion 8b of the case main body 8d to the 1 st direction side. In the step of inserting a part of the bus bar 9, the part of the bus bar 9 is inserted into the 2 nd opening 6c toward the 1 st direction side. In the step of connecting the bus bar 9 and the motor 2, the bus bar 9 and the wiring member 33 of the stator 30 are connected by using a working tool or the like inserted from the working hole 6j. That is, the bus bar 9 and the wiring member 33 are connected by the wiring screw portion 18 and the nut portion 19 through the working hole portion 6j opened in the housing 6.

According to the present embodiment, when assembling the motor unit 1, the inverter case 8 does not need to be opened when connecting the bus bar 9 and the wiring member 33 of the motor 2. That is, the case lid portion 8e does not need to be detached from the case main body 8 d. Therefore, by fixing the bus bar 9 to the inverter case 8 in advance in an environment with little dust such as a clean room, it is possible to suppress foreign matter such as dust from entering the inverter case 8, and to stably maintain the performance of the inverter 7.

The length of the 1 st coupling member 10 in the 2 nd direction is smaller than the length in the 3 rd direction when viewed in the 1 st direction. That is, the 1 st coupling member 10 extends in the 3 rd direction. According to the present embodiment, the plurality of bus bars 9 are arranged in the 3 rd direction, and accordingly, the 1 st coupling member 10 has an outer shape in the 3 rd direction larger than that in the 2 nd direction. Therefore, the 1 st coupling member 10 is suppressed from being excessively enlarged in outer shape (in particular, outer shape in the 2 nd direction). The material cost of the 1 st coupling member 10 can be reduced, and the fixing strength with the inverter case 8 can be easily ensured.

The 1 st connecting member 10 includes a partition wall portion 10d, a mounting cylindrical portion 10a, an insertion portion 10b, a bus bar fixing portion 10c, a 1 st groove portion 10e, a 1 st flange portion 10h, a nut holding portion 10f, and an insulating wall portion 10g.

The partition wall 10d has a plate shape. The partition wall 10d has a plate shape extending in a direction perpendicular to the 1 st direction. The partition wall portion 10d is oblong extending in the 3 rd direction as viewed in the 1 st direction. The partition wall 10d has an oblong shape with the 3 rd direction as the major axis and the 2 nd direction as the minor axis when viewed in the 1 st direction. The outer peripheral portion of the partition wall 10d faces the entire circumferential range around the 1 st opening 8c in the wall 8b from the 1 st direction side. In the present embodiment, the "hole periphery of the 1 st opening hole 8 c" refers to an annular portion of the wall portion 8b that is disposed adjacent to the inner periphery of the 1 st opening hole 8c and extends along the inner periphery of the 1 st opening hole 8c. The partition wall 10d closes the 1 st opening hole 8c. The partition wall 10d closes the opening on the 1 st direction side of the 1 st opening hole 8c. The partition wall 10d overlaps the 1 st aperture 8c as a whole when viewed in the 1 st direction, and covers the 1 st aperture 8c as a whole. The partition wall 10d blocks the communication between the 1 st aperture 8c and the 2 nd aperture 6c.

The mounting tube portion 10a has a tubular shape extending from the partition wall portion 10d toward the other side in the 1 st direction. The installation tube portion 10a has an oblong shape extending in the 3 rd direction when viewed in the 1 st direction. The mounting cylindrical portion 10a has an oblong shape with the 3 rd direction as the major axis and the 2 nd direction as the minor axis when viewed in the 1 st direction. The mounting tube 10a is inserted into the 1 st opening hole 8c. In the present embodiment, the mounting cylindrical portion 10a is fitted in the 1 st opening hole 8c. According to the present embodiment, the mounting tube portion 10a is fitted into the 1 st opening hole 8c, and the 1 st connecting member 10 and the inverter case 8 are positioned and assembled. This also enables accurate positioning of the bus bar 9 and (the terminal block or the like of) the inverter case 8. The alignment can be stably performed when the 1 st coupling member 10 and the 2 nd coupling member 14 are combined, and the bus bar 9 and the wiring member 33 of the motor 2 can be easily connected. The bus bar 9 is disposed inside the mounting tube portion 10a so as to be separated from the mounting tube portion 10a when viewed in the 1 st direction. Insulation between the 1 st opening hole 8c and the bus bar 9 is ensured by the mounting tube portion 10 a.

As shown in fig. 6, the mounting cylindrical portion 10a has a plurality of 1 st crush ribs 10n provided on the outer peripheral surface of the mounting cylindrical portion 10a and extending in the 1 st direction. The 1 st pressing ribs 10n are arranged at intervals along the circumferential direction of the outer peripheral surface of the mounting tube portion 10 a. In the present embodiment, the 1 st pressing rib 10n is disposed on a portion facing the 2 nd direction side (+ Z direction), a portion facing the 2 nd direction other side (-Z direction), a portion facing the one axial side (+ Y direction), and a portion facing the other axial side (-Y direction) of the outer peripheral surface of the mounting cylindrical portion 10a (see fig. 10). The 1 st pressing rib 10n is crushed between the outer peripheral surface of the mounting tube portion 10a and the inner peripheral surface of the 1 st opening hole 8c. The 1 st crush rib 10n is crushed in the direction perpendicular to the 1 st direction between the outer peripheral surface of the mounting tube portion 10a and the inner peripheral surface of the 1 st open hole 8c, and allows the mounting tube portion 10a and the 1 st open hole 8c to move relatively in the 1 st direction. The 1 st crush rib 10n is capable of plastic deformation, e.g., beyond the elastic deformation region. According to the present embodiment, the mounting cylindrical portion 10a is positioned with high accuracy with respect to the 1 st opening hole 8c by the plurality of 1 st pressing ribs 10n. That is, the mounting tube portion 10a is mounted in a centered posture with respect to the 1 st opening hole 8c.

As shown in fig. 3 and 4, in the present embodiment, the insertion portion 10b has a cylindrical shape extending from the partition wall portion 10d toward the 1 st direction side. The insertion portion 10b is oblong extending in the 3 rd direction as viewed in the 1 st direction. The insertion portion 10b has an oblong shape with the 3 rd direction as the major axis and the 2 nd direction as the minor axis when viewed in the 1 st direction. The insertion portion 10b is inserted into a guide tube portion 14a of the 2 nd coupling member 14, which will be described later. The insertion portion 10b has an outer peripheral tapered surface 10i, an inner peripheral tapered surface 10j, and a 3 rd groove portion 10k. In fig. 4, the 3 rd groove portion 10k is not shown.

The outer peripheral tapered surface 10i is disposed at the end portion on the 1 st direction side of the outer peripheral surface of the insertion portion 10 b. The outer peripheral tapered surface 10i is an inclined surface arranged to face the inside of the 2 nd opening 6c when viewed in the 1 st direction as facing the 1 st direction side. That is, as shown in fig. 3, when viewed in cross section along the 1 st direction, the outer peripheral tapered surface 10i extends obliquely toward the inner peripheral surface of the insertion portion 10b as it goes toward the 1 st direction side. According to the present embodiment, since the outer peripheral tapered surface 10i is provided at the 1 st direction side end portion of the insertion portion 10b, the insertion portion 10b can be easily inserted into the guide tube portion 14 a. Therefore, the 1 st coupling member 10 attached to the inverter case 8 and the 2 nd coupling member 14 attached to the case 6 can be easily assembled.

The inner peripheral tapered surface 10j is disposed at the 1 st direction side end portion of the inner peripheral surface of the insertion portion 10 b. When viewed in cross section along the 1 st direction, the inner peripheral tapered surface 10j extends obliquely toward the outer peripheral surface of the insertion portion 10b as it goes toward the 1 st direction side. According to the present embodiment, since the inner peripheral tapered surface 10j is provided at the 1 st direction side end portion of the insertion portion 10b, the insertion portion 10b can be easily fitted to the outside of the inner tubular portion 14c of the 2 nd coupling member 14, which will be described later. Therefore, the 1 st coupling member 10 attached to the inverter case 8 and the 2 nd coupling member 14 attached to the case 6 can be easily assembled.

The 3 rd groove portion 10k is disposed in a portion of the outer peripheral surface of the insertion portion 10b that faces the inner peripheral surface of the guide tube portion 14 a. In the present embodiment, the 3 rd groove portion 10k is disposed in the intermediate portion between the end portion on the 1 st direction side and the end portion on the 1 st direction side in the outer peripheral surface of the insertion portion 10 b. The 3 rd groove portion 10k has an annular shape extending along the outer peripheral surface of the insertion portion 10b when viewed in the 1 st direction. The 3 rd groove portion 10k has an oblong shape extending along the outer peripheral surface of the insertion portion 10b when viewed in the 1 st direction.

The number of the bus bar fixing portions 10c is the same as the number of the bus bars 9, and a plurality (3) of the bus bar fixing portions are provided in the present embodiment. The 3 bus bar fixing portions 10c are arranged in a 3 rd direction. The bus bar fixing portion 10c has a portion extending from the partition wall portion 10d toward the 1 st direction side. The bus bar fixing portion 10c has a portion extending from the partition wall portion 10d toward the 1 st direction other side. The partition wall 10d holds the bus bar fixing portion 10c. The bus bar fixing portion 10c is fixed to the partition wall portion 10d. The partition wall 10d cuts off the communication between the 1 st aperture 8c and the 2 nd aperture 6c via the insertion portion 10 b. A part of the bus bar 9 is buried and fixed in the bus bar fixing portion 10c. Specifically, a part of the bus bar 9 is embedded and fixed to the bus bar fixing portion 10c by insert molding or the like in which the bus bar 9 is an insert member. According to the present embodiment, the bus bar 9 is in close contact with the bus bar fixing portion 10c, and the sealing property between the bus bar 9 and the bus bar fixing portion 10c is ensured. The bus bar 9 is stably supported by the bus bar fixing portion 10c. Further, the partition wall 10d prevents the oil O and the like in the case 6 from entering the inverter case 8 through the 2 nd opening 6c and the 1 st opening 8c. The 1 st opening hole 8c can be sealed with a simple structure.

In the present embodiment, the 2 nd extending portion 9b of the bus bar 9 and the portions of the pair of 1 st extending portions 9a that are continuous with (adjacent to) the 2 nd extending portion 9b are embedded in the bus bar fixing portion 10c. That is, in the bus bar 9, a portion extending in the 1 st direction (the 1 st extending portion 9 a) and a portion extending in a direction different from the 1 st direction (the 2 nd extending portion 9 b) are buried and fixed in the bus bar fixing portion 10c. According to the present embodiment, for example, even when an external force in the 1 st direction is applied to the bus bar 9 at the time of assembling the motor unit 1, the bus bar 9 can be suppressed from moving (i.e., coming off) in the 1 st direction with respect to the bus bar fixing portion 10c. The fixing strength of the bus bar 9 and the bus bar fixing portion 10c is improved, and the sealing property between the bus bar 9 and the bus bar fixing portion 10c is stably ensured.

The 1 st groove portion 10e is provided on a surface of the 1 st coupling member 10 facing the inverter case 8. The 1 st groove portion 10e has a ring shape surrounding the 1 st opening 8c when viewed in the 1 st direction. The 1 st groove portion 10e has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. The 1 st groove portion 10e is disposed on the outer peripheral portion of the partition wall portion 10d. The 1 st groove portion 10e extends along the outer peripheral portion of the partition wall portion 10d. The 1 st groove portion 10e is disposed on the surface facing the other side in the 1 st direction in the outer peripheral portion of the partition wall portion 10d, and is open to the other side in the 1 st direction.

The 1 st flange 10h is located outside the 1 st groove portion 10e as viewed in the 1 st direction. The 1 st flange portion 10h is continuous with the outer peripheral portion of the partition wall portion 10d. The 1 st flange 10h has a plate shape. The 1 st flange 10h spreads in a direction perpendicular to the 1 st direction. The structure of the 1 st flange 10h other than the above will be described later.

The nut holding portion 10f extends along one 1 st extending portion 9a on the 1 st direction side of the pair of 1 st extending portions 9a of the bus bar 9. The nut holding portion 10f holds the nut portion 19. The nut portion 19 is inserted into the nut holding portion 10f toward the 1 st direction other side. When held by the nut holding portion 10f, the nut portion 19 is restrained from moving in the 2 nd and 3 rd directions relative to the nut holding portion 10f. The nut portion 19 is disposed opposite to the through hole 9 c. In the present embodiment, the nut portion 19 is disposed below the bus bar 9 and faces the through hole 9c from below. According to the present embodiment, the bus bar 9 and the wiring member 33 of the motor 2 can be connected by inserting the wiring screw portion 18 through the through hole 9c of the bus bar 9 and screwing the nut portion 19 held by the nut holding portion 10f. The bus bar 9 and the wiring member 33 can be connected by a simple structure using the 1 st connecting member 10 as a terminal block. In addition, the degree of freedom of routing wiring within the housing 6 can be improved.

Insulating wall 10g extends from partition wall 10d toward the 1 st direction side. The insulating wall 10g has a plate shape extending in a direction perpendicular to the 3 rd direction. The insulating wall portion 10g is disposed between the adjacent bus bars 9 and extends in the 1 st direction. A plurality of (2) insulating wall portions 10g are provided in a 3 rd direction. In the present embodiment, the adjacent bus bar fixing portions 10c are connected to each other in the 3 rd direction on the 1 st direction side of the partition wall portion 10d via the insulating wall portion 10g. According to the present embodiment, the insulation between the adjacent bus bars 9 is ensured by the insulating wall portion 10g.

The 2 nd coupling member 14 is made of resin. The 2 nd connecting member 14 is made of, for example, PPS resin containing an elastomer component. The 2 nd coupling member 14 is constituted by one member. The 2 nd coupling member 14 is made of the same material as the 1 st coupling member 10.

The 2 nd connecting member 14 is attached to the housing 6. The 2 nd connecting member 14 is attached to the wall portion 6e of the motor housing portion 6 a. The 2 nd coupling member 14 is in contact with the housing 6 in the 1 st direction. The 2 nd coupling member 14 is fixed to the housing 6 by a plurality of 2 nd screw members 16 described later. That is, the 2 nd coupling member 14 is fixed to the housing 6. The 2 nd coupling member 14 is positioned between the case 6 and the inverter case 8 in the 1 st direction, and is provided in the 2 nd opening hole 6c. The 2 nd coupling member 14 and the 1 st coupling member 10 face each other in the 1 st direction. The bus bar 9 passes through the 2 nd coupling member 14. The bus bar 9 is inserted into the 2 nd coupling member 14 toward the 1 st direction side. The 1 st direction side end 9d of the bus bar 9 protrudes from the 2 nd coupling member 14 toward the 1 st direction side.

The 2 nd connecting member 14 has a length in the 2 nd direction smaller than that in the 3 rd direction when viewed in the 1 st direction. That is, the 2 nd coupling member 14 extends in the 3 rd direction. According to the present embodiment, the plurality of bus bars 9 are arranged in the 3 rd direction, and accordingly, the 2 nd coupling member 14 has an outer shape in the 3 rd direction larger than that in the 2 nd direction. Therefore, the outer shape (particularly, the outer shape in the 2 nd direction) of the 2 nd coupling member 14 is suppressed from being excessively enlarged. The material cost of the 2 nd coupling member 14 can be reduced, and the fixing strength with the housing 6 can be easily ensured.

The 2 nd coupling member 14 includes a mounting wall portion 14b, a guide tube portion 14a, an inner tube portion 14c, a coupling wall portion 14d, a 2 nd groove portion 14e, and a 2 nd flange portion 14f.

The mounting wall portion 14b has a plate shape. The mounting wall portion 14b is formed in a plate shape extending in a direction perpendicular to the 1 st direction. The mounting wall portion 14b is annular extending along the inner periphery of the 2 nd opening hole 6c. The mounting wall portion 14b is oblong extending in the 3 rd direction as viewed in the 1 st direction. The mounting wall portion 14b has an oblong shape with the 3 rd direction as the major axis and the 2 nd direction as the minor axis when viewed in the 1 st direction. The portion other than the inner peripheral portion of the mounting wall portion 14b faces the entire circumferential range around the hole of the 2 nd opening 6c in the wall portion 6e from the 1 st direction other side. In the present embodiment, the "hole periphery of the 2 nd opening 6 c" means an annular portion of the wall portion 6e which is disposed adjacent to the inner periphery of the 2 nd opening 6c and extends along the inner periphery of the 2 nd opening 6c.

The guide cylindrical portion 14a has a cylindrical shape extending from the mounting wall portion 14b toward the 1 st direction side. The guide cylindrical portion 14a extends from the inner peripheral portion of the mounting wall portion 14b toward the 1 st direction side. The guide tube portion 14a has an oblong shape extending in the 3 rd direction when viewed in the 1 st direction. The guide tube portion 14a has an oblong shape with the 3 rd direction as the major axis and the 2 nd direction as the minor axis when viewed in the 1 st direction. The guide tube portion 14a is inserted into the 2 nd opening hole 6c. In the present embodiment, the guide cylindrical portion 14a is fitted in the 2 nd opening hole 6c. According to the present embodiment, the guide cylindrical portion 14a is fitted in the 2 nd opening hole 6c, and the 2 nd connecting member 14 and the housing 6 are positioned and assembled. This enables stable alignment when the 2 nd coupling member 14 and the 1 st coupling member 10 are combined, and facilitates assembly. The bus bar 9 is disposed inside the guide tube portion 14a so as to be separated from the guide tube portion 14a when viewed in the 1 st direction. Insulation between the 2 nd opening hole 6c and the bus bar 9 is ensured by the guide tube portion 14 a.

As shown in fig. 6, the guide cylinder portion 14a has a plurality of 2 nd pressing ribs 14k provided on the outer peripheral surface of the guide cylinder portion 14a and extending in the 1 st direction. The plurality of 2 nd pressing ribs 14k are arranged at intervals from each other along the circumferential direction of the outer peripheral surface of the guide cylindrical portion 14 a. In the present embodiment, the 2 nd pressing rib 14k is disposed on the outer peripheral surface of the guide cylinder portion 14a at a portion facing the 2 nd direction side (+ Z direction), a portion facing the 2 nd direction side (-Z direction), a portion facing the one axial side (+ Y direction), and a portion facing the other axial side (-Y direction), respectively. The 2 nd pressing rib 14k is crushed between the outer peripheral surface of the guide tube portion 14a and the inner peripheral surface of the 2 nd opening hole 6c. The 2 nd pressing rib 14k is crushed in the direction perpendicular to the 1 st direction between the outer peripheral surface of the guide tube portion 14a and the inner peripheral surface of the 2 nd open hole 6c, and allows the guide tube portion 14a and the 2 nd open hole 6c to move relatively in the 1 st direction. The 2 nd pressing rib 14k can be plastically deformed, for example, beyond the elastic deformation region. According to the present embodiment, the guide cylindrical portion 14a is positioned with high accuracy with respect to the 2 nd opening hole 6c by the plurality of 2 nd pressing ribs 14k. That is, the guide tube portion 14a is attached to the 2 nd opening hole 6c in a centered posture.

As shown in fig. 3, the guide cylinder portion 14a has a receiving tapered surface 14h. The receiving tapered surface 14h is disposed in an opening portion of the inner peripheral surface of the guide tube portion 14a located at the other end in the 1 st direction. The receiving tapered surface 14h is an inclined surface disposed outward of the 2 nd opening 6c when viewed in the 1 st direction as facing the 1 st direction second side. That is, as shown in fig. 3, the receiving tapered surface 14h extends obliquely toward the outer peripheral portion of the mounting wall portion 14b as it goes toward the other side in the 1 st direction when viewed in cross section along the 1 st direction. According to the present embodiment, since the receiving tapered surface 14h is provided in the opening portion on the other side in the 1 st direction of the guide tube portion 14a, the insertion portion 10b can be easily inserted into the guide tube portion 14 a. Therefore, the 1 st coupling member 10 attached to the inverter case 8 and the 2 nd coupling member 14 attached to the case 6 can be easily assembled.

The inner tube portion 14c is disposed inside the guide tube portion 14 a. The inner tube portion 14c is disposed so as to be separated inward from the guide tube portion 14a when viewed in the 1 st direction. The shape of the inner tube portion 14c and the shape of the guide tube portion 14a are substantially similar to each other when viewed in the 1 st direction. The bus bar 9 is disposed inside the inner tube portion 14c so as to be separated from the inner tube portion 14c when viewed in the 1 st direction. Insulation between the 2 nd opening hole 6c and the bus bar 9 is ensured by the inner cylindrical portion 14c.

The inner tube portion 14c has a guide tapered surface 14g. The guide tapered surface 14g is disposed at the other end portion in the 1 st direction in the outer peripheral surface of the inner tube portion 14c. The guide tapered surface 14g is an inclined surface arranged to face the inside of the 2 nd opening 6c when viewed in the 1 st direction as facing the 1 st direction other side. That is, the guide tapered surface 14g extends obliquely toward the inner peripheral surface of the inner tube portion 14c as it goes to the other side in the 1 st direction when viewed in cross section along the 1 st direction. According to the present embodiment, since the guide tapered surface 14g is provided at the other end portion in the 1 st direction of the inner tube portion 14c, the insertion portion 10b can be easily fitted to the outside of the inner tube portion 14c.

The 1 st direction side end portion of the inner tube portion 14c and the 1 st direction side end portion of the guide tube portion 14a are connected via a connecting wall portion 14d. The connecting wall portion 14d has a plate shape. The connecting wall portion 14d has a plate shape extending in a direction perpendicular to the 1 st direction. The connecting wall portion 14d has a ring shape extending along the inner periphery of the 2 nd opening 6c. According to the present embodiment, since the inner tubular portion 14c is provided inside the insertion portion 10b and the connection wall portion 14d is provided on the 1 st direction side of the insertion portion 10b, the oil O and the like in the housing 6 does not easily reach between the insertion portion 10b and the guide tubular portion 14 a. Therefore, the oil O and the like can be prevented from leaking from the inside of the housing 6 to the outside through the space between the insertion portion 10b and the guide cylindrical portion 14 a. In addition, deterioration of the 3 rd seal portion 13 described later can be suppressed, and the component life of the 3 rd seal portion 13 can be extended.

The 2 nd groove 14e is provided on a surface of the 2 nd coupling member 14 facing the housing 6. The 2 nd groove portion 14e has an annular shape surrounding the 2 nd opening 6c when viewed in the 1 st direction. The 2 nd groove portion 14e has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. The 2 nd groove portion 14e is disposed in the mounting wall portion 14b. The 2 nd groove 14e has an annular shape extending along the mounting wall 14b. The 2 nd groove portion 14e is disposed on the surface of the mounting wall portion 14b facing the 1 st direction side, and opens to the 1 st direction side.

The 2 nd flange 14f is located outside the 2 nd groove portion 14e as viewed in the 1 st direction. The 2 nd flange portion 14f is continuous with the outer peripheral portion of the mounting wall portion 14b. The 2 nd flange portion 14f has a plate shape. The 2 nd flange portion 14f expands in the direction perpendicular to the 1 st direction. The structure of the 2 nd flange portion 14f other than the above will be described later.

The 1 st seal portion 11 is disposed between the inverter case 8 and the 1 st coupling member 10 in the 1 st direction, and is in contact with the inverter case 8 and the 1 st coupling member 10. The 1 st seal portion 11 is disposed between a surface of the 1 st coupling member 10 facing the other side in the 1 st direction and a surface of the inverter case 8 facing the surface facing the one side in the 1 st direction. The 1 st seal portion 11 is elastically deformable. According to the present embodiment, the 1 st sealing portion 11 seals the gap between the inverter case 8 and the 1 st coupling member 10. Since the 1 st seal portion 11 is sandwiched between the inverter case 8 and the 1 st coupling member 10 in the 1 st direction, the 1 st seal portion 11 as a whole can be equally acted on by the 1 st pressing force of the 1 st screw member 15 in the 1 st direction. Therefore, the sealing function of the 1 st seal portion 11 is stabilized. The first seal portion 11 can be prevented from being twisted or damaged during assembly. The 1 st seal portion 11 suppresses entry of liquid such as water or oil and foreign matter from the outside of the inverter case 8 to the inside. The 1 st sealing portion 11 can ensure the 1 st opening hole 8c in sealing property.

The 1 st seal portion 11 has a ring shape surrounding the 1 st opening hole 8c when viewed in the 1 st direction. The 1 st seal portion 11 has an oblong shape elongated in the 3 rd direction when viewed in the 1 st direction. In the present embodiment, the 1 st sealing portion 11 is an O-ring or the like provided as a separate member from the 1 st coupling member 10. According to the present embodiment, the 1 st sealing portion 11 can stably prevent liquids such as water and oil, and foreign substances from entering the inverter case 8 from the outside through the 1 st opening hole 8c. The 1 st seal portion 11 is maintained in good sealing performance by a plurality of 1 st screw members 15 described later.

The 1 st seal part 11 is disposed in the 1 st groove part 10 e. According to the present embodiment, the 1 st seal part 11 can be easily attached to the 1 st coupling member 10, and the 1 st seal part 11 can be prevented from being positionally displaced when the motor unit 1 is assembled and after the assembly. The 1 st groove portion 10e stably ensures the sealing property of the 1 st seal portion 11.

The 2 nd seal portion 12 is disposed between the housing 6 and the 2 nd coupling member 14 in the 1 st direction, and is in contact with the housing 6 and the 2 nd coupling member 14. The 2 nd seal portion 12 is disposed between a surface of the housing 6 facing the other side in the 1 st direction and a surface of the 2 nd coupling member 14 facing the surface facing the one side in the 1 st direction. The 2 nd seal portion 12 is elastically deformable. According to the present embodiment, the 2 nd sealing portion 12 seals the space between the housing 6 and the 2 nd coupling member 14. Since the 2 nd seal portion 12 is sandwiched between the housing 6 and the 2 nd coupling member 14 in the 1 st direction, the pressing force in the 1 st direction by the 2 nd screw member 16 can be uniformly applied to the entire 2 nd seal portion 12. Therefore, the sealing function of the 2 nd seal portion 12 is stabilized. The 2 nd seal part 12 can be prevented from being twisted or damaged during assembly. The second sealing portion 12 prevents liquid such as water and foreign matter from entering the housing 6 from the outside and prevents oil O from leaking from the inside to the outside of the housing 6. The 2 nd sealing portion 12 can ensure the sealing property of the 2 nd opening hole 6c.

The 2 nd seal portion 12 has a ring shape surrounding the 2 nd opening 6c when viewed in the 1 st direction. The 2 nd seal portion 12 is an oblong shape that is long in the 3 rd direction as viewed in the 1 st direction. In the present embodiment, the 2 nd sealing portion 12 is an O-ring or the like provided as a separate member from the 2 nd coupling member 14. According to the present embodiment, the 2 nd seal portion 12 more stably suppresses entry of liquid such as water and foreign matter into the housing 6 from the outside through the 2 nd opening hole 6c and leakage of oil O from the inside to the outside of the housing 6. The 2 nd seal portion 12 is maintained in good sealing performance by a plurality of 2 nd screw members 16 described later.

The 2 nd seal part 12 is disposed in the 2 nd groove part 14 e. According to the present embodiment, the 2 nd seal part 12 can be easily attached to the 2 nd coupling member 14, and the 2 nd seal part 12 can be prevented from being positionally displaced when and after the motor unit 1 is assembled. The 2 nd groove portion 14e stably ensures the sealing property of the 2 nd seal portion 12. In the example of the present embodiment, the 2 nd seal part 12 and the 1 st seal part 11 are disposed to overlap each other when viewed in the 1 st direction. That is, the 2 nd groove portion 14e and the 1 st groove portion 10e are arranged to overlap each other when viewed in the 1 st direction.

The 3 rd sealing part 13 seals between the 1 st coupling member 10 and the 2 nd coupling member 14. The 3 rd seal portion 13 is disposed between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10b facing the inner peripheral surface. The 3 rd seal portion 13 is in contact with the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10 b. That is, the 3 rd seal portion 13 seals between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10 b. The 3 rd seal portion 13 is elastically deformable. According to the present embodiment, the 1 st coupling member 10 and the 2 nd coupling member 14 are sealed by the 3 rd sealing portion 13. Specifically, when the motor unit 1 is assembled, the insertion portion 10b of the 1 st coupling member 10 is inserted into the guide tube portion 14a of the 2 nd coupling member 14, whereby the 3 rd seal portion 13 is in contact with the outer peripheral surface of the insertion portion 10b and the inner peripheral surface of the guide tube portion 14a, and these peripheral surfaces are sealed with each other. That is, the 3 rd sealing portion 13 seals between the insertion portion 10b and the guide tube portion 14a in a radial direction assuming that a portion of the bus bar 9 extending in the 1 st direction is a central axis. The 3 rd seal portion 13 prevents liquid such as water and foreign matter from entering the inside of the housing 6 from the outside, and prevents oil O from leaking to the outside from the inside of the housing 6. The sealing property of the 2 nd opening hole 6c is ensured by ensuring the sealing property between the 1 st coupling member 10 and the 2 nd coupling member 14 by the 3 rd sealing portion 13.

The 3 rd seal portion 13 has an annular shape extending along the outer peripheral surface of the insertion portion 10b when viewed in the 1 st direction. The 3 rd seal portion 13 has an oblong shape extending along the outer peripheral surface of the insertion portion 10b when viewed in the 1 st direction. In the present embodiment, the 3 rd sealing portion 13 is an O-ring or the like provided as a separate member from the insertion portion 10 b. According to the present embodiment, the 3 rd seal portion 13 more stably suppresses entry of liquid such as water and foreign matter from the outside of the housing 6 into the inside through the insertion portion 10b of the 1 st coupling member 10 and the guide tube portion 14a of the 2 nd coupling member 14 and the 2 nd opening hole 6c, and leakage of oil O from the inside of the housing 6 to the outside.

The 3 rd seal part 13 is disposed in the 3 rd groove part 10k. According to the present embodiment, the 3 rd seal portion 13 can be easily attached to the insertion portion 10b, and the 3 rd seal portion 13 can be prevented from being positionally displaced when the motor unit 1 is assembled and after the assembly. The 3 rd groove portion 10k stably ensures the sealing property of the 3 rd sealing portion 13.

In addition, in the present embodiment, since the 1 st coupling member 10 and the 2 nd coupling member 14 are made of resin, the degree of freedom in the shape of the 1 st coupling member 10 and the 2 nd coupling member 14 is increased, and the 1 st coupling member 10 and the 2 nd coupling member 14 can be easily assembled. Specifically, as in the present embodiment, the outer peripheral tapered surface 10i is provided at the 1 st direction side tip portion of the outer peripheral surface of the insertion portion 10b, so that the insertion portion 10b can be easily inserted into the guide tube portion 14 a. Further, the receiving tapered surface 14h is provided at the opening portion on the other side in the 1 st direction in the inner peripheral surface of the guide tube portion 14a, so that the insertion portion 10b can be easily inserted into the guide tube portion 14 a. The same operational effects as described above can be obtained with respect to the inner peripheral tapered surface 10j and the guide tapered surface 14g. Therefore, the 1 st coupling member 10 and the 2 nd coupling member 14 can be easily aligned (particularly, aligned in the direction perpendicular to the 1 st direction), and the 1 st coupling member 10 and the 2 nd coupling member 14 can be easily assembled.

Further, since the 1 st coupling member 10 and the 2 nd coupling member 14 are made of resin, damage to the 3 rd seal portion 13 and the like can be suppressed. That is, the hard edge or the like to which the 3 rd seal part 13 is hooked is prevented from being provided on the outer peripheral surface of the insertion part 10b and the inner peripheral surface of the guide tube part 14a, and the 3 rd seal part 13 can be prevented from being twisted or damaged. Therefore, the sealing function of the 3 rd seal portion 13 is stabilized.

The 1 st flange portion 10h is located outside the 1 st seal portion 11 as viewed in the 1 st direction. As shown in fig. 6 and 7, the 1 st flange portion 10h includes a 1 st screw hole portion 10l and a 1 st pressing portion 10m. The 1 st screw hole portion 10l penetrates the 1 st flange portion 10h in the 1 st direction, and a plurality of 1 st openings 8c are arranged around the 1 st opening 8c along the inner periphery of the 1 st opening 8c with intervals therebetween. The 1 st screw member 15 passes through the 1 st threaded hole portion 10l. The center axis of the 1 st threaded hole portion 10l and the screw axis of the 1 st screw member 15 substantially coincide with each other. A metal cylindrical member may be fitted to the inner peripheral portion of the 1 st threaded hole 10l.

The 1 st pressing portion 10m has a plate shape. The 1 st pressing portion 10m expands in a direction perpendicular to the 1 st direction. The 1 st pressing portion 10m is located outside the 1 st sealing portion 11 between a pair of 1 st screw hole portions 10l adjacent around the hole of the 1 st open hole 8c when viewed in the 1 st direction. According to the present embodiment, the 1 st pressing portion 10m can efficiently transmit the pressing force in the 1 st direction by the 1 st screw member 15 to the 1 st sealing portion 11.

When viewed in the 1 st direction, a 1 st imaginary line segment L1 connecting a pair of 1 st screw members 15 adjacent to each other around the hole of the 1 st open hole 8c (the screw axes of the 1 st screw members 15) overlaps at least a part of the 1 st seal portion 11. According to the present embodiment, the pressing force in the 1 st direction by the 1 st screw member 15 can be stably applied to the 1 st seal portion 11. Therefore, the sealing function of the 1 st seal portion 11 is more stable.

The 2 nd flange portion 14f is located outside the 2 nd seal portion 12 as viewed in the 1 st direction. The 2 nd flange 14f has a 2 nd screw hole portion 14i and a 2 nd pressing portion 14j. The 2 nd screw hole portion 14i penetrates the 2 nd flange portion 14f in the 1 st direction, and a plurality of 2 nd opening holes 6c are arranged around the 2 nd opening hole 6c along the inner periphery of the 2 nd opening hole 6c with an interval therebetween. The 2 nd screw member 16 passes through the 2 nd threaded hole portion 14i. The center axis of the 2 nd threaded hole portion 14i and the screw axis of the 2 nd screw member 16 substantially coincide with each other. A metal cylindrical member may be fitted to the inner peripheral portion of the 2 nd threaded hole 14i.

The 2 nd pressing portion 14j has a plate shape. The 2 nd pressing portion 14j expands in the direction perpendicular to the 1 st direction. The 2 nd pressing portion 14j is located outside the 2 nd seal portion 12 between a pair of 2 nd screw hole portions 14i adjacent around the hole of the 2 nd open hole 6c when viewed in the 1 st direction. According to the present embodiment, the pressing force in the 1 st direction by the 2 nd screw member 16 can be efficiently transmitted to the 2 nd seal part 12 by the 2 nd pressing part 14j.

When viewed in the 1 st direction, a 2 nd imaginary line segment L2 connecting the pair of 2 nd screw members 16 adjacent to each other around the hole of the 2 nd open hole 6c (the screw axes of the 2 nd screw members 16) overlaps at least a part of the 2 nd seal part 12. According to the present embodiment, the pressing force in the 1 st direction by the 2 nd screw member 16 can be stably applied to the 2 nd seal portion 12. Therefore, the sealing function of the 2 nd seal portion 12 is more stable.

The 1 st screw member 15 extends in the 1 st direction. The 1 st screw member 15 has a screw shaft portion 15a provided with an external thread portion on the outer periphery thereof and a screw head portion 15b having a larger outer diameter than the screw shaft portion 15 a. The 1 st screw member 15 fixes the 1 st coupling member 10 to the inverter case 8. The 1 st screw member 15 is provided in plurality. The 1 st screw members 15 are disposed around the 1 st opening hole 8c along the inner periphery of the 1 st opening hole 8c with a space therebetween.

The 2 nd screw member 16 extends in the 1 st direction. The 2 nd screw member 16 has a screw shaft portion 16a provided with an external thread portion on the outer periphery thereof and a screw head portion 16b having a larger outer diameter than the screw shaft portion 16 a. The 2 nd screw member 16 fixes the 2 nd coupling member 14 to the housing 6. The 2 nd screw member 16 is provided in plurality. The plurality of 2 nd screw members 16 are disposed around the 2 nd aperture 6c along the inner periphery of the 2 nd aperture 6c with a space therebetween.

According to the present embodiment, the 1 st coupling member 10 is stably fixed to the inverter case 8 by the plurality of 1 st screw members 15. The 2 nd coupling member 14 is stably fixed to the housing 6 by a plurality of 2 nd screw members 16. The case 6 and the inverter case 8 are easily assembled by combining the 1 st coupling member 10 fixed to the inverter case 8 and the 2 nd coupling member 14 fixed to the case 6.

The 1 st screw members 15 and the 2 nd screw members 16 are alternately arranged without overlapping when viewed in the 1 st direction. According to the present embodiment, the 1 st screw members 15 are prevented from being spaced apart from each other too much, and the 1 st coupling member 10 is fixed to the inverter case 8 in a stable state (with securing fixing strength). The plurality of 2 nd screw members 16 are prevented from being spaced apart from each other excessively, and the fixed state of the 2 nd coupling member 14 with respect to the housing 6 is stabilized. Since the 1 st screw member 15 and the 2 nd screw member 16 do not overlap when viewed in the 1 st direction, the distance between the inverter case 8 and the case 6 in the 1 st direction can be kept small. That is, as the distance between the inverter case 8 and the case 6, the length in the 1 st direction of the thickness (length in the 1 st direction) of any of the screw heads 15b and 16b that can accommodate the 1 st screw member 15 and the 2 nd screw member 16 may be secured. Therefore, the motor unit 1 can be compactly configured.

The 1 st screw members 15 and the 2 nd screw members 16 are arranged line-symmetrically with respect to a symmetry axis perpendicular to the 1 st direction when viewed in the 1 st direction. Specifically, as shown in fig. 7, the plurality of (4) 1 st screw members 15 and the plurality of (4) 2 nd screw members 16 are arranged line-symmetrically with respect to a Z axis (symmetry axis) passing through the center of the 1 st seal part 11 (or the 2 nd seal part 12) as viewed in the 1 st direction. The 1 st and 2

nd screw members

15 and 16 are arranged in line symmetry with respect to a Y axis (symmetry axis) passing through the center of the 1 st seal portion 11. According to the present embodiment, the 1 st flange portion 10h of the 1 st coupling member 10 and the 2 nd flange portion 14f of the 2 nd coupling member 14 can have line symmetry as viewed in the 1 st direction. Therefore, manufacturing and assembling of the parts become easy.

In the present embodiment, 4 screw members 15 are provided for the 1 st screw member. The shape of the 41 st screw members 15 connected by line segments (1 st imaginary line segment L1) when viewed in the 1 st direction is a parallelogram having the 1 st screw members 15 as corners. The 2 nd screw member 16 is provided with 4. The shape of the 42 nd screw members 16 connected by line segments (2 nd imaginary line segment L2) is a parallelogram having the 2 nd screw members 16 as corners when viewed in the 1 st direction. According to the present embodiment, the respective outer shapes of the 1 st flange portion 10h and the 2 nd flange portion 14f can be suppressed to be compact. The 1 st screw member 15 can be disposed close to the 1 st seal portion 11, and the sealing function of the 1 st seal portion 11 can be stabilized. The 2 nd screw member 16 can be disposed close to the 2 nd seal portion 12, and the sealing function of the 2 nd seal portion 12 can be stabilized. The respective fixing strengths by the 1 st screw member 15 and the 2 nd screw member 16 are more stable.

Fig. 8 shows a modification of the present embodiment. In this modification, 3 screw members are provided for each of the 1 st screw member 15 and the 2 nd screw member 16. When viewed in the 1 st direction, the shape of the 31 st screw members 15 connected by the line segment (1 st virtual line segment L1) is an isosceles triangle having the 1 st screw members 15 as corners, and the shape of the 32 nd screw members 16 connected by the line segment (2 nd virtual line segment L2) is an isosceles triangle having the 2 nd screw members 16 as corners. In this case, the number of the 1 st screw member 15 and the 2 nd screw member 16 can be reduced, and the assembly is easy.

Further, as in the present embodiment, when the inverter case 8 and the motor housing portion 6a are disposed adjacent to each other in the radial direction of the motor axis J2, it is difficult to easily assemble the support structure of the bus bar 9 across these members and to ensure the sealing performance of the 2 nd opening hole 6c and the 1 st opening hole 8c. According to the present embodiment, the support structure of the bus bar 9 is easily assembled, and the sealability of the 2 nd opening hole 6c and the 1 st opening hole 8c is ensured.

In the present embodiment, since the inverter case 8 and the motor housing portion 6a are adjacent to each other in the horizontal direction, the outer dimension of the motor unit 1 in the vertical direction (the direction of gravity) can be kept small. Therefore, the motor unit 1 can be easily stored in a limited installation space of a vehicle or the like.

< embodiment 2 >

Next, a motor unit 100 according to embodiment 2 of the present invention will be described with reference to fig. 9 to 13. In embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted. In embodiment 2, the same steps as those of the method for manufacturing the motor unit 1 described in embodiment 1 are omitted.

The motor unit 100 of the present embodiment differs from the motor unit 1 described in the above embodiment in the structure of the 1 st coupling member 10, the 2 nd coupling member 14, the 3 rd sealing portion 13, the bus bar 9, the wiring member 33, and the like.

As shown in fig. 9 to 11, in the 1 st coupling member 10 according to the present embodiment, the insertion portion 10b and a portion of the bus bar fixing portion 10c extending from the partition wall portion 10d toward the 1 st direction side are connected to each other in a direction perpendicular to the 1 st direction. That is, the portion of the bus bar fixing portion 10c extending from the partition wall portion 10d toward the 1 st direction side and the insertion portion 10b surrounding the portion from the outside when viewed from the 1 st direction are integrally provided so as to form one column extending in the 1 st direction as a whole.

The insertion portion 10b has a plurality of guide ribs 10p provided on the outer peripheral surface of the insertion portion 10b and extending in the 1 st direction. The plurality of guide ribs 10p are arranged at intervals from each other in the circumferential direction of the outer peripheral surface of the insertion portion 10 b. In the present embodiment, the guide ribs 10p are respectively disposed on a portion facing one side in the 2 nd direction (+ Z direction), a portion facing the other side in the 2 nd direction (-Z direction), a portion facing one side in the axial direction (+ Y direction), and a portion facing the other side in the axial direction (-Y direction) in the outer peripheral surface of the insertion portion 10 b. The guide rib 10p has a top surface 10q facing outward (inner peripheral surface side of the 2 nd opening 6 c) when viewed from the 1 st direction. The top surface 10q is planar, for example.

The 2 nd coupling member 14 of the present embodiment does not have the inner tube portion 14c and the coupling wall portion 14d. Therefore, the 2 nd connecting member 14 has a simple structure and can be easily manufactured. As shown in fig. 9 and 12, the guide cylinder portion 14a has a plurality of guide grooves 14m provided on the inner peripheral surface of the guide cylinder portion 14a and extending in the 1 st direction. The guide grooves 14m are arranged at intervals in the circumferential direction of the inner circumferential surface of the guide tube portion 14 a. In the present embodiment, the guide groove 14m is disposed in a portion facing one side in the 2 nd direction (+ Z direction), a portion facing the other side in the 2 nd direction (-Z direction), a portion facing one side in the axial direction (+ Y direction), and a portion facing the other side in the axial direction (-Y direction) in the inner peripheral surface of the guide tube portion 14 a. The guide groove 14m has a bottom surface 14n facing inward (bus bar 9 side) when viewed from the 1 st direction. The bottom surface 14n is, for example, planar.

When the insertion portion 10b is inserted into the guide tube portion 14a, the guide ribs 10p are inserted into the guide grooves 14m from the 1 st direction. That is, each guide rib 10p is disposed in each guide groove 14m. When the insertion portion 10b is inserted into the guide tube portion 14a, the top surface 10q and the bottom surface 14n face each other. The dimension of the gap between the bottom surface 14n of the guide groove 14m and the top surface 10q of the guide rib 10p is smaller than the dimension of the gap between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10 b.

In the present embodiment, the guide rib 10p of the insertion portion 10b is disposed in the guide groove 14m of the guide cylindrical portion 14a, so that the fitting between the guide cylindrical portion 14a and the insertion portion 10b is stabilized, and rattling is suppressed. Further, when the housing 6 and the inverter case 8 are fixed by screwing the fixing member 6f from the direction perpendicular to the 1 st direction, the size of the gap between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10b is maintained constant over the entire circumference by the bottom surface 14n of the guide groove 14m and the top surface 10q of the guide rib 10p being in contact. That is, the size of the gap between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10b can be suppressed from varying at each position in the circumferential direction. Therefore, the sealability of the 3 rd seal part 13 is stabilized over the entire circumference. For example, unlike the present embodiment, in comparison with a high-precision configuration in which the fitting tolerance between the inner peripheral surface of the guide tube portion 14a and the outer peripheral surface of the insertion portion 10b needs to be reduced over the entire circumference, according to the present embodiment, the insertion portion 10b is easily inserted into the guide tube portion 14a, and the 1 st coupling member 10 and the 2 nd coupling member 14 are easily assembled. In addition, the requirement of high precision for each mold for molding the 1 st connecting member 10 and the 2 nd connecting member 14 is suppressed, and the mold cost is reduced.

The 3 rd seal portion 13 of the present embodiment is a D-shaped ring or the like having a D-shaped cross section. Therefore, the 3 rd seal part 13 can be prevented from twisting in the 3 rd groove part 10k, and the sealing property of the 3 rd seal part 13 is more stabilized.

As shown by the two-dot chain line in fig. 9, the end portion 33b on the other side in the 1 st direction of the wiring member 33 is located on the one side in the 2 nd direction (+ Z direction) as it goes to the other side in the 1 st direction (-X direction). In the present embodiment, at least one of the wiring member 33 and the bus bar 9 is elastically deformable, and the plate surface of the end portion 33b of the wiring member 33 is brought into contact with the plate surface of the end portion 9d of the bus bar 9 by screwing the wiring screw portion 18 and the nut portion 19.

According to the present embodiment, when the bus bar 9 is inserted into the 2 nd opening 6c, the end portion 9d of the bus bar 9 on the 1 st direction side can be prevented from being caught by the end portion 33b of the wiring member 33 on the 1 st direction side. That is, the distal end of the 1 st direction one end portion 9d of the bus bar 9 is prevented from coming into contact with the distal end of the 1 st direction other end portion 33b of the wiring member 33, and the bus bar 9 is stably inserted into the predetermined position in the housing 6. Therefore, the assembling workability is good. Further, as described above, since at least one of the wiring member 33 and the bus bar 9 can be elastically deformed while improving the assembling workability, the contact area between the wiring member 33 and the bus bar 9 can be stably secured by screwing the wiring screw portion 18 to the nut portion 19.

Fig. 13 shows a modification of the present embodiment. In this modification, the 1 st direction one end 9d of the bus bar 9 is located on the 2 nd direction other side (-Z direction) toward the 1 st direction one side (+ X direction). According to this modification, as described above, the assembling workability is improved, and the amount of elastic deformation of the wiring member 33 and the bus bar 9 is suppressed to be small. Therefore, stress generated in the wiring member 33, the bus bar 9, and their peripheral members, etc. can be suppressed.

The present invention is not limited to the above-described embodiments, and for example, structural modifications and the like can be made as described below without departing from the scope of the present invention.

In embodiment 1 described above, the 2 nd coupling member 14 has the inner tube portion 14c, but the present invention is not limited thereto. For example, in the case of a configuration in which the inside of the 2 nd opening hole 6c is immersed in the oil O, it is preferable that the 2 nd connecting member 14 does not include the inner cylindrical portion 14c.

The 1 st seal part 11 may not be an O-ring. The 1 st seal part 11 may be in a liquid state or a gel state. The 1 st sealing part 11 may be made of silicone resin. The 1 st seal portion 11 may not be elastically deformable. The 1 st sealing portion 11 and the 1 st coupling member 10 may be portions of one member manufactured by two-color molding.

The 2 nd seal part 12 may not be an O-ring. The 2 nd seal part 12 may be in a liquid state or a gel state. The 2 nd sealing part 12 may be made of silicone resin. The 2 nd seal portion 12 may not be elastically deformable. The 2 nd seal portion 12 and the 2 nd coupling member 14 may be portions of one member manufactured by two-color molding.

The 3 rd sealing part 13 may not be an O-ring. The 3 rd seal part 13 may be in a liquid state or a gel state. The 3 rd sealing part 13 may be made of silicone resin. The 3 rd seal portion 13 may not be elastically deformable. The 3 rd sealing portion 13 and the 1 st coupling member 10 may be portions of one member manufactured by two-color molding.

It is to be noted that the respective configurations (structural elements) described in the above-described embodiment, modification, supplementary description, and the like may be combined with each other, and addition, omission, replacement, or other changes of the configuration may be made without departing from the scope of the present invention. The present invention is not limited to the above-described embodiments, but is limited only by the claims.

Description of the reference symbols

1: a motor unit; 2: a motor; 6: a housing; 6c: 2 nd opening hole; 6f: a fixing member; 6j: a working hole; 7: an inverter; 8: an inverter case; 8c: 1 st opening hole; 9: a bus bar; 9c: a through hole; 9d: an end portion on the 1 st direction side of the bus bar; 10: 1 st connecting member; 10a: an installation cylinder part; 10b: an insertion portion; 10c: a bus bar fixing portion; 10d: a partition wall portion; 10e: a 1 st groove part; 10f: a nut holding portion; 10n: 1 st extrusion rib; 10p: a guide rib; 10q: a top surface; 11: 1 st sealing part; 12: a 2 nd seal part; 13: a 3 rd sealing part; 14: a 2 nd connecting member; 14a: a guide cylinder part; 14k: a 2 nd extrusion rib; 14m, is: a guide groove; 14n: a bottom surface; 15: 1 st screw member; 17: a cover portion; 18: a wiring screw portion; 19: a nut portion; 33: a wiring member of the motor; 33b: an end portion of the other side of the wiring member in the 1 st direction; HA: a central axis of the working hole; and SA: the screw axis of the wiring screw portion.

Claims

1. A motor unit having:

a motor;

an inverter electrically connected to the motor;

a bus bar connecting the motor and the inverter, having a portion extending in a 1 st direction;

an inverter case which houses the inverter and has a 1 st opening hole through which the bus bar passes;

a housing that houses the motor, and has a 2 nd opening hole that is opposed to the 1 st opening hole in the 1 st direction, the bus bar passing through the 2 nd opening hole;

a 1 st connecting member made of resin, attached to the inverter case, for closing the 1 st opening hole and supporting the bus bar;

a 2 nd coupling member made of resin, attached to the housing, and having a guide tube portion inserted into the 2 nd opening hole;

a 1 st seal portion that is disposed between the inverter case and the 1 st coupling member in the 1 st direction and that is in contact with the inverter case and the 1 st coupling member;

a 2 nd seal portion that is disposed between the housing and the 2 nd coupling member in the 1 st direction and that is in contact with the housing and the 2 nd coupling member; and

and a 3 rd seal portion which is in contact with an inner peripheral surface of the guide cylinder portion and an outer peripheral surface of an insertion portion of the 1 st coupling member inserted into the guide cylinder portion.

2. The motor unit according to claim 1,

the 1 st seal portion has a ring shape surrounding the 1 st opening hole when viewed from the 1 st direction.

3. The motor unit according to claim 1 or 2, wherein,

the 2 nd seal portion has a ring shape surrounding the 2 nd opening hole when viewed from the 1 st direction.

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

the 3 rd seal portion has a ring shape extending along an outer peripheral surface of the insertion portion when viewed from the 1 st direction.

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

the direction from the 1 st open hole to the 2 nd open hole in the 1 st direction is defined as the 1 st direction side, the direction from the 2 nd open hole to the 1 st open hole is defined as the 1 st direction side,

the guide cylinder portion has a receiving tapered surface at an opening portion of an end portion of an inner peripheral surface of the guide cylinder portion on the other side in the 1 st direction,

the receiving tapered surface is an inclined surface that faces outward of the 2 nd opening when viewed from the 1 st direction as facing the other side of the 1 st direction.

6. The motor unit according to any one of claims 1 to 5,

regarding the 1 st direction, the direction from the 1 st opening hole to the 2 nd opening hole as the 1 st direction side, and regarding the direction from the 2 nd opening hole to the 1 st opening hole as the 1 st direction side,

the insertion portion has an outer peripheral tapered surface at an end portion on the 1 st direction side in an outer peripheral surface of the insertion portion,

the outer peripheral tapered surface is an inclined surface facing the inside of the 2 nd opening when viewed from the 1 st direction as facing the 1 st direction side.

7. The motor unit according to any one of claims 1 to 6,

the 1 st coupling member includes:

a bus bar fixing part in which a part of the bus bar is buried and fixed; and

and a partition wall portion that holds the bus bar fixing portion, closes the 1 st opening hole, and cuts off communication between the 1 st opening hole and the 2 nd opening hole via the inside of the insertion portion.

8. The motor unit according to claim 7,

the bus bar has a portion extending in a direction different from the 1 st direction,

a portion of the bus bar extending in the 1 st direction and a portion extending in a direction different from the 1 st direction are buried and fixed in the bus bar fixing portion.

9. The motor unit according to any one of claims 1 to 8,

the motor unit includes:

a plurality of 1 st screw members for fixing the 1 st coupling member to the inverter case; and

and a plurality of 2 nd screw members for fixing the 2 nd coupling member to the housing.

10. The motor unit according to any one of claims 1 to 9,

the bus bars are provided in plurality at intervals from each other in a direction perpendicular to the 1 st direction,

the 1 st coupling member has an insulating wall portion that is disposed between the adjacent bus bars and extends in the 1 st direction.

11. The motor unit according to any one of claims 1 to 10,

the bus bar has a through hole penetrating the bus bar,

the 1 st coupling member includes a nut holding portion that holds a nut portion disposed to face the through hole.

12. The motor unit according to any one of claims 1 to 11,

the 1 st coupling member has an annular 1 st groove portion surrounding the 1 st opening hole on a surface of the 1 st coupling member facing the inverter case when viewed from the 1 st direction,

the 1 st seal portion is disposed in the 1 st groove portion.

13. The motor unit according to any one of claims 1 to 12,

the 2 nd coupling member has an annular 2 nd groove portion surrounding the 2 nd opening hole on a surface of the 2 nd coupling member facing the housing when viewed from the 1 st direction,

the 2 nd seal part is disposed in the 2 nd groove part.

14. The motor unit according to any one of claims 1 to 13,

the insertion portion has a 3 rd groove portion in a portion of an outer peripheral surface of the insertion portion that faces an inner peripheral surface of the guide cylinder portion,

the 3 rd groove portion has a ring shape extending along an outer peripheral surface of the insertion portion when viewed from the 1 st direction,

the 3 rd seal part is disposed in the 3 rd groove part.

15. The motor unit according to any one of claims 1 to 14,

the 1 st coupling member has an installation tube portion fitted in the 1 st opening hole.

16. The motor unit according to any one of claims 1 to 15,

the guide cylinder portion is fitted in the 2 nd opening hole.