WO2020067277A1

WO2020067277A1 - Motor unit

Info

Publication number: WO2020067277A1
Application number: PCT/JP2019/037831
Authority: WO
Inventors: 大輔村田; 真澄水谷; 慶介福永
Original assignee: 日本電産株式会社; 日本電産トーソク株式会社
Priority date: 2018-09-28
Filing date: 2019-09-26
Publication date: 2020-04-02
Also published as: CN112840535B; JP7389045B2; JPWO2020067277A1; CN112840535A

Abstract

One embodiment of the motor unit according to the present invention is a motor unit which is mounted to a vehicle and drives the vehicle. The motor unit comprises: a body portion having a motor and a housing that houses the motor; and an inverter unit having an inverter that supplies electric power to the motor and an inverter case that houses the inverter. The body portion has a first busbar connected to a coil in the motor. The inverter unit has a second busbar connected to the inverter and connected, in a connection section, to the first busbar. The first busbar has: a terminal connection section connected to the coil at an end on one side of the motor in the axial direction; a radial-direction extension section extending from the terminal connection section to the outside of the motor in the radial direction; and an axial-direction extension section extending, from an end of the radial-direction extension section on the outside in the radial direction, along an outside surface of the motor in the axial direction of the motor. The first busbar has a plate shape wherein, in the axial-direction extension section, the radial direction of the motor serves as the plate thickness direction.

Description

Motor unit

The present invention relates to a motor unit. This application is based on Japanese Patent Application No. 2018-185590 filed on September 28, 2018. This application claims the benefit of priority to the application. The entire contents are hereby incorporated by reference into the present application.

駆動 In recent years, drive devices mounted on electric vehicles have been actively developed. Patent Literature 1 describes a motor unit connected to a PDU (power drive unit) having an inverter.

JP 2010-268633 A

The motor and the inverter are connected to each other via a conductive member called a bus bar. The busbar is connected to the motor and the inverter, respectively, and these busbars are connected to each other at the final stage of the assembly process. The conventional structure has a problem in workability when connecting the bus bars.

In view of the above circumstances, an object of the present invention is to provide a motor unit capable of facilitating a process of connecting bus bars respectively connected to a motor and an inverter.

One aspect of the motor unit of the present invention is a motor unit mounted on a vehicle and driving the vehicle. The motor unit includes a main body having a motor and a housing for housing the motor, and an inverter for supplying power to the motor and an inverter unit having an inverter case for housing the inverter. The main body has a first bus bar connected to a coil of the motor. The inverter unit has a second bus bar connected to the inverter and connected to the first bus bar at a connection portion. A terminal connecting portion connected to the coil at one axial end of the motor; a radially extending portion extending radially outward from the terminal connecting portion from the terminal connecting portion; An axially extending portion extending in the axial direction of the motor along an outer surface of the motor from a radially outer end of the radially extending portion. The first bus bar has a plate shape in which the radial direction of the motor has a thickness direction in the axially extending portion.

According to one aspect of the present invention, there is provided a motor unit capable of facilitating a connection process between bus bars connected to a motor and an inverter.

FIG. 1 is a conceptual diagram of a motor unit according to one embodiment. FIG. 2 is a perspective view of the motor unit according to the embodiment. FIG. 3 is an exploded perspective view of the motor unit according to the embodiment. FIG. 4 is an exploded perspective view of the motor unit according to the embodiment. FIG. 5 is a perspective view of the motor unit according to the embodiment, in which a housing is not shown.

Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiment, and can be arbitrarily changed within the technical idea of the present invention. In the following drawings, the scale and number of the actual structure may be different from those of the actual structure in order to make each structure easy to understand.

In the following description, the gravity direction is defined based on the positional relationship when the motor unit 10 is mounted on a vehicle located on a horizontal road surface. 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 indicates the vertical direction (that is, the vertical direction), the + Z direction is the upper side (opposite to the direction of gravity), and the -Z direction is the lower side (the direction of gravity). The X-axis direction is a direction orthogonal to the Z-axis direction and indicates the front-back direction of the vehicle on which the motor unit 10 is mounted. The + X direction is the front of the vehicle, and the -X direction is the rear of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle. The + Y direction is the left side of the vehicle, and the −Y direction is the right side of the vehicle. It is.

In the following description, each direction will be described with the motor axis J1 of the motor 1 as the center. That is, the axial direction of the motor 1 about the motor axis J1 is simply called “axial direction”, the radial direction of the motor 1 about the motor axis J1 is simply called “radial direction”, and the motor axis J1 is The circumferential direction of the motor 1 is simply referred to as “circumferential direction”.

FIG. 1 is a conceptual diagram of a motor unit 10 according to one embodiment. FIG. 2 is a perspective view of the motor unit 10.
Note that a motor axis J1, a counter axis J3, an output axis J4, and a rotation axis J6, which will be described later, are virtual axes that do not actually exist.

The motor unit 10 is mounted on the vehicle and drives the vehicle by rotating the wheels H. The motor unit 10 is mounted on, for example, an electric vehicle (EV). The motor unit 10 may be mounted on a vehicle using a motor as a power source, such as a hybrid vehicle (HEV) or a plug-in hybrid vehicle (PHV).

As shown in FIG. 1, the motor unit 10 includes a main body 9 and an inverter unit 8. The main body 9 includes the motor 1, a transmission mechanism (transaxle) 5, and a housing 6 that houses the motor 1 and the transmission mechanism 5.

(housing)
The housing 6 is made of, for example, aluminum die casting. The housing 6 is configured by connecting a plurality of members arranged along the vehicle width direction. Inside the housing 6, an accommodation space 6S for accommodating the motor 1 and the transmission mechanism 5 is provided. The housing 6 holds the motor 1 and the transmission mechanism 5 in the accommodation space 6S. The accommodation space 6S is divided into a motor chamber 6A that accommodates the motor 1 and a gear chamber 6B that accommodates the transmission mechanism 5.

The housing 6 includes a motor housing 62 having a motor chamber 6A therein and housing the motor 1, a gear housing 63 having a gear chamber 6B therein and housing the transmission mechanism 5, a motor chamber 6A and a gear chamber 6B. And a partition part 61 for partitioning the above. The partition 61 is located between the motor housing 62 and the gear housing 63 in the axial direction.

(motor)
The motor 1 is a motor generator having both a function as a motor and a function as a generator. The motor 1 mainly functions as an electric motor to drive the vehicle, and functions as a generator during regeneration.

The motor 1 has a rotor 31 and a stator 32 surrounding the rotor 31. The rotor 31 is rotatable around a motor axis J1. Stator 32 is annular. The stator 32 surrounds the rotor 31 from the radial outside of the motor shaft J1.

The rotor 31 is fixed to the motor drive shaft 11 described later. The rotor 31 rotates around the motor axis J1. The rotor 31 has a rotor core and a rotor magnet held by the rotor core.

The stator 32 has a stator core and a coil 32a. The stator core has a plurality of teeth projecting radially inward of the motor shaft J1. The coil 32a is wound around teeth of the stator core.

The motor 1 is connected to the inverter 8a. The inverter 8 a converts a DC current supplied from a battery (not shown) into an AC current and supplies the AC current to the motor 1. Each rotation speed of the motor 1 is controlled by controlling the inverter 8a.

(Transmission mechanism)
The transmission mechanism 5 transmits the power of the motor 1 and outputs the power from the output shaft 55. The transmission mechanism 5 includes a plurality of mechanisms for transmitting power between the driving source and the driven device.

The transmission mechanism 5 includes a motor drive shaft 11, a motor drive gear 21, a counter shaft 13, a counter gear (large gear) 23, a drive gear (small gear) 24, a ring gear 51, and an output shaft (axle). ) 55 and a differential device (differential gear) 50.

ギヤ Each gear and each shaft of the transmission mechanism 5 can rotate around any one of the motor shaft J1, the counter shaft J3, and the output shaft J4. In the present embodiment, the motor shaft J1, the counter shaft J3, and the output shaft J4 extend in parallel with each other. The motor shaft J1, the counter shaft J3, and the output shaft J4 are parallel to the width direction of the vehicle. In the following description, the axial direction means the axial direction of the motor shaft J1. That is, the axial direction is a direction parallel to the motor shaft J1 and means the vehicle width direction.

The motor drive shaft 11 extends along the motor axis J1. The motor drive shaft 11 is fixed to the rotor 31. The motor drive shaft 11 is rotated by the motor 1. A motor drive gear 21 is fixed to the motor drive shaft 11.

The motor drive shaft 11 extends in the axial direction about the motor shaft J1. The motor drive shaft 11 is a hollow shaft opened on both axial sides of the motor shaft J1. The external shape of the motor drive shaft 11 as viewed along the axial direction is a cylindrical shape centered on the motor shaft J1. The motor drive shaft 11 is rotatably supported around a motor axis J1 by bearings. An output shaft 55 passes through the inside of the motor drive shaft 11.

The motor drive gear 21 is fixed to the motor drive shaft 11. The motor drive gear 21 rotates around the motor axis J1 together with the motor drive shaft 11.

The counter shaft 13 extends along the counter axis J3. The counter shaft 13 rotates around the counter axis J3. The counter shaft 13 is rotatably held via, for example, a bearing (not shown) in a case (not shown) that accommodates the transmission mechanism 5. A counter gear 23 and a drive gear 24 are fixed to the counter shaft 13.

The counter gear 23 is fixed to the counter shaft 13. The counter gear 23 rotates around the counter axis J3 together with the counter shaft 13. The counter gear 23 meshes with the motor drive gear 21.

The drive gear 24 is fixed to the counter shaft 13. The drive gear 24 rotates around the counter axis J3 together with the counter shaft 13 and the counter gear 23. The drive gear 24 is arranged on the opposite side of the motor 1 with respect to the counter gear 23 in the axial direction.

The ring gear 51 is fixed to the differential device 50. The ring gear 51 rotates around the output shaft J4. The ring gear 51 meshes with the drive gear 24. Ring gear 51 transmits the power of motor 1 transmitted via drive gear 24 to differential device 50.

The differential device 50 is a device for transmitting the torque output from the motor 1 to the wheels H of the vehicle. The differential device 50 has a function of transmitting the same torque to the output shafts 55 of the left and right wheels while absorbing a speed difference between the left and right wheels H when the vehicle turns.

The differential device 50 includes a gear housing (not shown) fixed to the ring gear 51, a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown). The gear housing rotates with the ring gear 51 about the output shaft J4. The gear housing houses a pair of pinion gears, a pinion shaft, and a pair of side gears. The pair of pinion gears are bevel gears facing each other. The pair of pinion gears are supported on a pinion shaft. The pair of side gears are bevel gears that mesh with the pair of pinion gears at right angles. Each of the pair of side gears is fixed to the output shaft 55.

The output shaft 55 rotates around the output axis J4. The motor unit 10 is provided with a pair of output shafts 55. Each of the pair of output shafts 55 is connected to a side gear of the differential device 50 at one end. That is, the output shaft 55 is connected to the ring gear 51 via the differential device 50. The power of the motor 1 is transmitted to the output shaft 55 via each gear. Further, the pair of output shafts 55 protrude outside the housing 6 at the other ends. A wheel H is attached to the other end of the output shaft 55. The output shaft 55 outputs power to the outside (road surface via the wheels H).

において In the present embodiment, the output shaft J4 coincides with the motor shaft J1. One of the pair of output shafts 55 passes through the inside of the motor drive shaft 11 which is a hollow shaft. Therefore, the motor unit 10 of the present embodiment can be downsized in the radial direction of the motor shaft J1 as compared with a motor unit having a structure in which the motor shaft J1 and the output shaft J4 are not arranged coaxially.

(Inverter unit)
As shown in FIG. 2, the inverter unit 8 has an inverter 8a and an inverter case 8b that houses the inverter 8a. Inverter 8a supplies electric power to motor 1. Although not shown, the inverter unit 8 further includes a circuit board and a capacitor.

FIGS. 3 and 4 are exploded perspective views of the motor unit 10, in which the inverter unit 8 is separated from the main body 9. 3 and 4 are different from each other in the perspective direction of the motor unit 10.

The inverter unit 8 has a substantially rectangular shape when viewed from above and below. The inverter unit 8 is fixed to the upper surface 6a of the housing 6. More specifically, inverter unit 8 is fixed to upper surface 6a of motor accommodating portion 62 of housing 6 in inverter case 8b. It should be noted that a cutout surface cut out along the lower surface of the inverter unit 8 is provided substantially at the center of the upper surface 6a. The upper surface 6a vertically opposes the lower surface of the inverter unit 8 with a gap at the cutout surface. Thereby, it is possible to suppress the vibration of the housing 6 from being transmitted to the inverter unit 8 and the inverter unit 8 being excited.
In this specification, the upper surface 6a of the housing 6 means the entire upper surface of the outer surface of the housing 6. The housing 6 faces the lower surface of the inverter unit 8 on the upper surface 6a.

The inverter unit 8 is located immediately above the motor 1. That is, the inverter unit 8 is located above the motor 1 and overlaps the motor 1 when viewed from above and below. This makes it possible to reduce the size of the motor unit 10 in the vehicle front-rear direction as compared with the case where the inverter unit 8 is disposed in the vehicle front-rear direction with respect to the motor 1.

Generally, the projected area of the motor housing 62 in the axial direction is smaller than the projected area of the gear housing 63 in the axial direction. According to the present embodiment, since the inverter unit 8 is arranged radially outside the motor accommodating portion 62, the inverter unit 8 can be easily arranged to overlap the gear accommodating portion 63 when viewed from the axial direction. Thereby, the projected area of the entire motor unit 10 in the axial direction can be reduced, and the size of the motor unit 10 can be reduced.

少なくとも At least a part of the inverter unit 8 overlaps the counter gear 23 when viewed from the axial direction. By arranging the inverter unit 8 on the counter gear 23, the projected area of the motor unit 10 in the axial direction can be reduced, and the size of the motor unit 10 can be reduced.

As shown in FIGS. 3 and 4, the inverter unit 8 is fixed to the housing 6 of the motor unit 10 at a plurality of fixing portions 40 and 45. The plurality of fixing portions 40 and 45 are classified into a first fixing portion 40 (see FIG. 3) and a second fixing portion 45 (see FIG. 4). The first fixing portion 40 is located on the vehicle front side with respect to the motor shaft J1, and the second fixing portion 45 is located on the vehicle rear side with respect to the motor shaft J1.

As shown in FIG. 3, the first fixing portion 40 has an eave portion 42 provided on the inverter unit 8, an opposing surface 43 provided on the housing 6, and a fixing bolt 41.

庇 The eaves 42 of the first fixing portion 40 project horizontally in the outer surface of the inverter case 8 b of the inverter unit 8. The eave portion 42 is provided with a through hole 42a penetrating in the up-down direction.

対向 The facing surface 43 of the first fixing portion 40 faces the eaves portion 42 in the vertical direction. In the present embodiment, the facing surface 43 is provided on the housing 6 located below the inverter unit 8. Therefore, in the present embodiment, the facing surface 43 of the first fixing portion 40 faces upward. The opposing surface 43 is provided with a screw hole 43a that extends in the up-down direction and opens on the eaves 42 side (that is, on the upper side).

固定 The fixing bolt 41 of the first fixing portion 40 is screwed into the screw hole 43 a of the facing surface 43 via the through hole 42 a of the eave portion 42. Thereby, the lower surface of the eaves portion 42 and the opposing surface 43 come into contact with each other, and the inverter unit 8 and the housing 6 are fixed to each other.

As shown in FIG. 4, the second fixing portion 45 has an eave portion 47 provided on the housing 6, an opposing surface 48 provided on the inverter unit 8, and a fixing bolt 46.

庇 The eave portion 47 of the second fixing portion 45 projects horizontally on the outer surface of the motor housing portion 62 of the housing 6. The eave portion 47 is provided with a through hole 47a penetrating vertically.

対向 The facing surface 48 of the second fixing portion 45 faces the eaves portion 47 in the vertical direction. In the present embodiment, the facing surface 48 is provided on the inverter unit 8 located above the housing 6. Therefore, in the present embodiment, the facing surface 48 of the second fixing portion 45 faces downward. The opposing surface 48 is provided with a screw hole 48a extending along the up-down direction and opening to the eaves portion 47 side (that is, the lower side).

固定 The fixing bolt 46 of the second fixing portion 45 is screwed into the screw hole 48 a of the facing surface 48 via the through hole 47 a of the eave portion 47. As a result, the upper surface of the eaves portion 47 comes into contact with the facing surface 48, and the inverter unit 8 and the housing 6 are fixed to each other.

１ The first fixing portion 40 and the second fixing portion 45 are arranged on opposite sides of the motor shaft J1 when viewed from the up-down direction. Further, the eaves 42 and 47 of the first fixing portion 40 and the second fixing portion 45 project from the motor shaft J1 in a direction away from the motor shaft J1 when viewed from above and below.

According to the present embodiment, the eave portion 42 of the first fixed portion 40 and the eave portion 47 of the second fixed portion 45 located on the opposite sides to the motor shaft J1 are connected to the inverter unit 8 and the housing 6 respectively. And are provided separately. Therefore, the size of the motor unit 10 in the vehicle front-rear direction can be reduced as compared with the case where all the eaves are provided on one of the inverter unit 8 and the housing 6.

(Connection structure between motor and inverter)
Next, an electrical connection structure between the motor 1 and the inverter 8a will be described. The motor 1 and the inverter 8a are connected via bus bars 71 and 72.

FIG. 5 is a perspective view of the motor unit 10 in which the illustration of the housing 6 is omitted.
The main body 9 has three first bus bars 71 and a first bus bar holder 76. In FIG. 5, the first bus bar holder 76 is indicated by a broken line.
On the other hand, inverter unit 8 has three second bus bars 72 and second bus bar holder 77.

１The first bus bar 71 and the second bus bar 72 are plate-shaped. The first bus bar 71 is connected to the coil 32a of the motor 1. On the other hand, the second bus bar 72 is connected to the inverter 8a. The first bus bar 71 and the second bus bar 72 are connected to each other at a connection portion 79. The connection part 79 is located inside the housing 6. The motor 1 and the inverter 8a are electrically connected via a first bus bar 71 and a second bus bar 72.

#The three first bus bars 71 are held by the first bus bar holder 76. The three first busbars 71 are embedded in the first busbar holder 76 by insert molding. The first bus bar 71 and the first bus bar holder 76 are arranged in the motor chamber 6A inside the housing 6 (see FIG. 1).

The first bus bar 71 has a terminal connecting portion 71a, a radially extending portion 71b, an axially extending portion 71c, and a circumferentially extending portion 71d.

The terminal connection portion 71a is located on one side (+ Y side) in the axial direction of the motor 1. The terminal connection part 71a is connected to the coil 32a of the motor 1. The coil 32a has a pair of coil ends 32b projecting from the stator core to one side in the axial direction. From the coil end 32b on one side in the axial direction of the pair of coil ends 32b, a coil end 32c that bundles conductive wires corresponding to U-phase, V-phase and W-phase extends. A crimp terminal is attached to the tip of the coil end 32c.
The terminal connection portion 71a is connected to a crimp terminal at the coil end 32c. That is, the terminal connection portion 71a is connected to the coil 32a at one axial end of the motor 1. The terminal connection portion 71a and the crimp terminal of the coil end 32c are fastened by screws 78.

The terminal connection portion 71a extends along the axial direction. The coil end 32c extends from the coil end 32b to one side in the axial direction. Since the terminal connection portion 71a extends in the axial direction, it is not necessary to curve the coil end 32c when connecting the coil end 32c and the terminal connection portion 71a. For this reason, the connection process of the coil end 32c and the terminal connection part 71a becomes easy. Further, it is possible to suppress a load from being applied to the coil end 32c in a state where the coil end 32c is connected to the terminal connection portion 71a.

The first bus bar 71 has a radial direction at the terminal connecting portion 71a as a thickness direction. More specifically, a direction parallel to a direction orthogonal to the tangential direction is defined as a thickness direction. For this reason, the terminal connection portion 71a can extend along the coil end 32c from the radial outside. This facilitates the connection process between the coil end 32c and the terminal connection portion 71a.

#The terminal connection portions 71a of the three first bus bars 71 are arranged in the circumferential direction. Therefore, the three terminal connection portions 71a do not overlap each other when viewed from the radial direction. Therefore, by performing the operation of connecting the terminal connection portion 71a to the coil end 32c from the outside in the radial direction, the connection operation can be simplified.

The radially extending portion 71b is located on one side of the motor 1 in the axial direction. The radially extending portion 71b extends radially outward from the terminal connection portion 71a. That is, the radially extending portion 71b is connected to the terminal connecting portion 71a. The first bus bar 71 is bent in the thickness direction at the boundary between the terminal connection portion 71a and the radially extending portion 71b. The radially outer end of the radially extending portion 71b is located radially outward of the stator 32 when viewed from the axial direction.

軸 The first bus bar 71 has the axial direction as the thickness direction in the radially extending portion 71b. Therefore, the dimension of the radially extending portion 71b along the axial direction can be reduced. As a result, the size along the axial direction of the region where the radially extending portion 71b is accommodated in the motor chamber 6A of the housing 6 can be reduced, and the housing 6 can be reduced in size.

The axially extending portion 71c extends axially along the outer surface of the motor 1 from the radially outer end of the radially extending portion 71b. The axially extending portion 71c is located radially outside the stator 32. The axial position of the axially extending portion 71c overlaps the axial position of the stator 32.

The axially extending portion 71c has a first end 71ca located on one side in the axial direction, and a second end 71cb located on the side opposite to the first end (ie, the other side in the axial direction). . The axial extension 71c is connected to the radial extension 71b at the first end 71ca. The first bus bar 71 is bent in the thickness direction at a boundary between the radially extending portion 71b and the axially extending portion 71c.

The first bus bar 71 has the radial direction as the thickness direction in the axially extending portion 71c. Therefore, the dimension of the axially extending portion 71c along the radial direction can be reduced. As a result, the size along the radial direction of the region where the axially extending portion 71c is accommodated in the motor chamber 6A of the housing 6 can be reduced, and the housing 6 can be reduced in size.

The circumferentially extending portion 71d extends in the circumferential direction from the second end 71cb of the axially extending portion 71c. In the present embodiment, the circumferentially extending portion 71d extends upward (ie, in the direction toward the inverter unit 8) from the axially extending portion 71c. In the first bus bar 71, the radial direction is defined as the thickness direction in the circumferentially extending portion 71d. The thickness direction of the circumferentially extending portion 71d coincides with the thickness direction of the axially extending portion 71c. The first bus bar 71 is curved along a direction orthogonal to the thickness direction at a boundary between the circumferentially extending portion 71d and the axially extending portion 71c.

The circumferential extension 71d has a first connection end 71da located on the opposite side of the axial extension 71c. The first bus bar 71 is connected to the second bus bar 72 at a first connection end 71da of the circumferentially extending portion 71d. That is, the connecting portion 79 is located at the circumferentially extending portion 71d. The first connection ends 71da of the three first bus bars 71 are arranged in the axial direction.

According to the present embodiment, the first bus bar 71 has the terminal connecting portion 71a, the radially extending portion 71b, and the axially extending portion 71c. The first bus bar 71 is routed from one axial side of the motor 1 to a position along the outer surface of the motor 1. Thereby, the first bus bar 71 can be routed to the vicinity of the inverter unit 8 arranged around the motor 1. As a result, connection between the first bus bar 71 and the second bus bar 72 can be facilitated.

According to this embodiment, since the first bus bar 71 has the circumferentially extending portion 71d, the first connection end 71da connected to the second bus bar 72 can be arranged on one side in the circumferential direction. . That is, according to the present embodiment, the first connection end 71da of the first bus bar 71 can be arranged closer to the inverter unit 8. As described later, the second bus bar 72 protrudes from the lower surface of the inverter case 8b and extends. By arranging the first connection end 71da of the first bus bar 71 close to the inverter unit 8, the protruding length of the second bus bar 72 can be reduced. If the projecting length of the second bus bar 72 is too long, the second bus bar 72 may interfere with other members and be deformed in a process of assembling the inverter unit 8 and the main body 9. According to the present embodiment, by shortening the protruding length of the second bus bar 72, it is possible to facilitate the handling of the bus bar unit in the assembling process.

The three second bus bars 72 are held by the second bus bar holder 77. The second busbar holder 77 has a rectangular shape in which the axial direction is the longitudinal direction and the corners are curved when viewed from the axial direction. The second bus bar holder 77 is provided with a through hole (not shown) through which the second bus bar 72 is inserted so as to penetrate vertically. The lower end (second connection end 72b) of the second busbar holder 77 projects from the second busbar holder 77 and is exposed.

A packing (not shown) is provided on the outer peripheral surface of the second bus bar holder 77 in the horizontal direction. As described later, the second busbar holder 77 is inserted into an opening 6h provided in the housing 6. The packing suppresses intrusion of moisture between the outer peripheral surface of the second bus bar holder 77 and the inner peripheral surface of the opening 6h.

The second bus bar 72 projects downward from the lower surface of the inverter case 8b. The second bus bar 72 extends to the inside of the housing 6 and is connected to the first bus bar 71 at a connection portion 79. The second bus bar 72 has a plate shape. The second bus bar 72 has a radial direction as a plate thickness direction. The thickness direction of the second bus bar 72 coincides with the thickness direction of the circumferentially extending portion 71d of the first bus bar 71. The three second bus bars 72 are arranged along the axial direction.

には A second connection end 72b is provided at the lower end of the second bus bar 72. The second bus bar 72 is connected to the first bus bar 71 at a second connection end 72b. The three second connection ends 72b are arranged in the axial direction.

The connecting portion 79 has three connecting bolts 79a. The first connection end 71da of the first bus bar 71 and the second connection end 72b of the second bus bar 72 are fixed to each other at a connection portion 79 by a connection bolt 79a. A cross-shaped groove is provided in the head of the connection bolt 79a. The connection bolt 79a is rotated by a tool (for example, a Phillips screwdriver) to fasten the first bus bar 71 and the second bus bar 72.

開口 As shown in FIG. 3, an opening 6h is provided in the upper surface 6a of the housing 6 to allow the inside and outside of the housing 6 to communicate with each other. The opening hole 6h vertically penetrates the outer surface of the housing 6 and opens upward.

#The three second bus bars 72 and the second bus bar holder 77 are inserted into the opening 6h of the housing 6. The second busbar holder 77 extends from the lower surface of the inverter unit 8 to the inside of the housing 6.

A window 6w is provided on the outer surface facing the radial direction of the housing 6 to communicate the inside and the outside of the housing 6. The window 6w penetrates the motor housing 62 of the housing 6 in the radial direction and opens in the radial direction. The window 6w is located immediately below the opening 6h. That is, the axial position of the window 6w overlaps the axial position of the opening 6h. The opening direction of the window 6w is orthogonal to the opening direction of the opening 6h. The window portion 6w is located radially outward with respect to the connection portion 79. As viewed from the radial direction, the window portion 6w overlaps with the connection portion 79. Therefore, the window portion 6w exposes the connection portion 79.

The window 6w is covered by the lid member 6c. That is, the housing 6 has the lid member 6c that covers the window 6w. The lid member 6c is screwed to the outer surface of the housing 6 using screws (not shown). The lid member 6c has a plate shape in which the opening direction of the window 6w is the plate thickness direction.

According to the present embodiment, the window 6w that exposes the connection portion 79 is provided on the outer surface of the housing 6. For this reason, the operator inserts a tool (a Phillips screwdriver in this embodiment) into the inside of the housing 6 from the window portion 6w, and connects the first bus bar 71 and the second bus bar 72 to each other at the connection portion 79. be able to. That is, according to the present embodiment, the step of connecting the first bus bar 71 and the second bus bar 72 can be easily performed.

According to the present embodiment, the window 6w opens radially on the outer surface of the housing 6. For this reason, the window 6w can be arranged close to the connecting portion 79. As a result, it is possible to easily access the connection portion 79 from the window portion 6w, and it is possible to further facilitate the connection work between the first bus bar 71 and the second bus bar 72 by the operator. .

According to this embodiment, the first bus bar 71 and the second bus bar 72 extend in the connecting portion 79 in the circumferential direction along the outer surface of the motor 1. As a result, the connecting portion 79 can be arranged close to the window 6w that opens in the radial direction, and the access to the connecting portion 79 from the window 6w can be facilitated.

According to the present embodiment, in the first bus bar 71 and the second bus bar 72, the thickness direction of the connecting portion 79 matches the opening direction of the window 6w. Therefore, when the first bus bar 71 and the second bus bar 72 are fastened from the plate thickness direction and fixed to each other, the work of fixing the first bus bar 71 and the second bus bar 72 can be facilitated. More specifically, in the present embodiment, the connection bolt 79a of the connection portion 79 extends along the opening direction of the window 6w. Therefore, the operator can easily fasten the first bus bar 71 and the second bus bar 72 by inserting a tool from the window 6w.

As described above, the embodiments and the modified examples of the present invention have been described. However, each configuration and the combination thereof in the embodiments and the modified examples are merely examples, and additions and omissions of the configurations may be made without departing from the gist of the present invention. , Substitutions and other changes are possible. The present invention is not limited by the embodiments.

For example, in the present embodiment, the case where the first bus bar is formed of a single member has been described. However, the first bus bar may be composed of a plurality of members. As an example, the first bus bar includes a first member having a terminal connection portion, a radially extending portion, and an axially extending portion 71c, and a second member having a circumferentially extending portion 71d. A structure in which the member and the second member are connected to each other may be employed.

DESCRIPTION OF SYMBOLS 1 ... motor, 5 ... transmission mechanism, 6 ... housing, 6a ... upper surface, 6c ... lid member, 6h ... opening hole, 6w ... window part, 8 ... inverter unit, 8a ... inverter, 8b ... inverter case, 9 ... body part 10, motor unit, 11 motor drive shaft, 13 counter shaft, 21 motor drive gear, 23 counter gear, 24 drive gear, 32a coil, 51 ring gear, 55 output shaft, 71 first , A terminal connection portion, 71b ... a radially extending portion, 71c ... an axially extending portion, 71ca ... a first end, 71cb ... a second end, 71d ... a circumferentially extending portion, 72 ... No. 2 bus bar, 79 ... connection part, 79a ... connection bolt, J1 ... motor shaft, J3 ... counter shaft, J4 ... output shaft

Claims

A motor unit mounted on a vehicle to drive the vehicle,
A body having a motor and a housing that houses the motor;
An inverter unit that has an inverter that supplies power to the motor and an inverter case that houses the inverter,
The main body is
A first bus bar connected to a coil of the motor,
The inverter unit includes:
A second bus bar connected to the inverter and connected to the first bus bar at a connection portion;
The first bus bar includes:
A terminal connection portion connected to the coil at one axial end of the motor;
A radially extending portion extending radially outward of the motor from the terminal connection portion;
An axially extending portion extending in an axial direction of the motor along an outer surface of the motor from a radially outer end of the radially extending portion,
The first bus bar has a plate shape in which a radial direction of the motor is a thickness direction in the axially extending portion.
Motor unit.
The axial extension has a first end connected to the radial extension, and a second end located on the opposite side of the first end,
The first bus bar includes:
A circumferentially extending portion extending along a circumferential direction of the motor from a second end of the axially extending portion;
The connection portion is located at the circumferentially extending portion,
The motor unit according to claim 1.
The connection portion is located inside the housing,
The housing is provided with a window portion that opens in a radial direction of the motor and exposes the connection portion.
The motor unit according to claim 1.
The housing is provided with an opening hole communicating the inside and outside of the housing,
The second bus bar protrudes from the inverter case and is inserted into the opening.
The motor unit according to claim 3.
The main body has a transmission mechanism that is housed in the housing, transmits power of the motor, and outputs the power from an output shaft,
The transmission mechanism,
A motor drive shaft extending along a motor axis and rotated by the motor;
A motor drive gear fixed to the motor drive shaft and rotating around the motor axis;
A counter shaft extending along the counter axis;
A counter gear fixed to the counter shaft, meshing with the motor drive gear, and rotating around the counter shaft;
A drive gear fixed to the counter shaft and rotating around the counter axis;
A ring gear that meshes with the drive gear and rotates around an output shaft;
The output shaft connected to the ring gear and rotating around the output shaft,
The motor shaft, the counter shaft, and the output shaft extend parallel to each other,
The motor drive shaft is a hollow shaft that opens on both axial sides of the motor shaft,
The output shaft is passed through the inside of the motor drive shaft,
The motor unit according to any one of claims 1 to 4.
The inverter unit is located immediately above the motor,
When viewed from the axial direction of the motor shaft, at least a part of the inverter unit overlaps a counter gear,
The motor unit according to claim 5.