WO2012147447A1

WO2012147447A1 - Drive device and mobile object equipped with same

Info

Publication number: WO2012147447A1
Application number: PCT/JP2012/058361
Authority: WO
Inventors: 長尾　健史; 二戸　秀之; 田口　賢治
Original assignee: 三洋電機株式会社
Priority date: 2011-04-28
Filing date: 2012-03-29
Publication date: 2012-11-01

Abstract

In the present invention, a drive device (20) of an electric vehicle (1) is provided with a motor (50) and a drive unit (70) for driving the motor (50). The motor (50) and the drive unit (70) are placed parallel to each other with a space therebetween in the rotational axis direction of the motor (50), and are electrically connected to each other.

Description

Driving device and moving body equipped with the same

The present invention relates to a drive device including a motor as a drive source and a drive unit for driving the motor. Further, the present invention relates to a moving body equipped with this driving device. The “moving body” described here includes an electric vehicle such as an electric bicycle, a motorcycle, an automatic tricycle, and an automatic four-wheel vehicle, and moves using a motor as a drive source.

Conventionally, mobile bodies such as automobiles and motorcycles generally use an engine that obtains driving force using gasoline or light oil as a driving source. However, recently, attention has been focused on the development of an electric vehicle and an electric vehicle using a motor that obtains a driving force using electric power as energy as a countermeasure for environmental protection.

The electric vehicle is equipped with a battery which is a secondary battery, a motor is driven by the electric power supplied from the battery, and the vehicle is driven by the driving force of the motor. In general, a moving body such as an electric vehicle is configured to supply power to a motor after power conversion or AC / DC conversion is performed on battery power by a drive circuit in order to control power of the motor. ing.

In recent years, a driving apparatus in which such a motor and its driving circuit are integrated has been proposed, and an example thereof can be seen in Patent Document 1. The power unit for an electric vehicle described in Patent Document 1 is a motor case that houses an electric motor, and an FET (field effect transistor: switching element) that constitutes a motor drive circuit adjacent to the rotation axis direction of the motor and power supply stability. A capacitor is installed.

Japanese Patent Laid-Open No. 5-95606

A drive device in which the motor and its drive circuit are integrated as described above is integrated with the motor and the drive circuit, which are also heat sources, arranged close to each other, so it is necessary to suppress the temperature rise. More specifically, the power unit for an electric vehicle described in Patent Document 1 has a drive circuit adjacent to the motor and they are densely packed. Therefore, there is a disadvantage that the temperature rises at the crowded portion. There is a concern that such a temperature rise may cause a failure of a motor or a drive circuit or a decrease in life.

The present invention has been made in view of the above points, and can achieve long life and long driving by efficiently radiating the heat generated at the time of driving while having a compact configuration. An object is to provide a highly reliable driving device. It is another object of the present invention to provide a moving body including a highly reliable electric vehicle equipped with such a drive device.

In order to solve the above-described problems, a drive device according to the present invention includes a motor and a drive unit for driving the motor, and the motor and the drive unit are arranged in the direction of the rotation axis of the motor. In addition to being juxtaposed at intervals along the line, they are electrically connected.

This configuration creates a space in the gap between the motor and the drive unit. Therefore, even when the motor and the drive unit each serve as a heat source, the heat transfer between the motor and the drive unit is hindered by the presence of a space between the motor and the drive unit, and the temperature rise is suppressed.

In addition, as the “drive unit” described here, it is possible to use a unit in which components constituting a drive circuit are integrated by a switching element or the like. Therefore, the drive unit of the present invention can be configured by arranging the drive units as individual components with respect to the motor, and arranging the drive units so as to be juxtaposed at intervals along the rotation axis direction of the motor.

Further, in the drive device having the above configuration, the motor includes a stator having a coil for rotating the rotor, and the stator is provided close to a side of the motor facing the drive unit. did.

The motor rotation shaft protrudes on the opposite side to the side facing the motor drive unit. In other words, the drive unit is arranged on the side where the rotating shaft does not protrude with respect to the motor. Here, when a power transmission member such as a wheel is disposed close to the rotating shaft of the motor, a sufficient heat dissipation effect may not be obtained in the direction in which the rotating shaft protrudes, that is, the direction where the drive unit is not disposed. There is sex. However, according to this configuration, since the stator having the coil as the heat generation source is provided close to the side facing the motor drive unit, the stator approaches the space generated between the motor and the drive unit. become. Therefore, the heat generated from the stator, that is, the motor, can be radiated to the space where the drive unit exists and in the gap with the drive unit.

Further, in the drive device having the above configuration, the drive unit includes a heat radiating portion for radiating heat, and the heat radiating portion is provided on a surface of the drive unit opposite to the side facing the motor. It was decided.

¡The side of the drive unit facing the motor may dissipate the heat generated by the motor, so there is a possibility that a large heat dissipation effect cannot be obtained. However, according to this configuration, since the heat radiating portion of the drive unit is provided on the surface on the opposite side to the side facing the motor of the drive unit, the heat radiating portion is farthest from the wheel rotated by the motor in the drive device. It will be arranged outside the drive unit. Therefore, the heat radiating portion can easily touch the outside air, and the heat radiating action of the drive unit is improved.

Further, in the drive device having the above-described configuration, each of the motor and the drive unit includes a power terminal for transferring power, and the power terminal of each of the motor and the drive unit is connected to the motor and the drive unit. It is provided on the side facing the same direction and is electrically connected by a bus bar.

According to this configuration, since it is not necessary to use an electric wire such as a wire harness in connecting the power terminals, the connection work is easy. In addition, the bus bar can be used in a straight line with a minimum length, and the terminals can be connected with a minimum distance. Thereby, use of a bus bar shorter than a wire harness is attained. Therefore, it is expected that power loss and noise are suppressed in the power supply path, and that the number of parts and part weight are reduced.

Further, the drive device having the above-described configuration includes a cover member that covers the periphery of each of the power terminal, the bus bar, and a connection portion between the power terminal and the bus bar.

According to this configuration, inundation is easily prevented at the power terminal, the bus bar, and the connection portion between the power terminal and the bus bar. That is, water resistance is improved. Therefore, the occurrence of an electrical adverse effect due to the flooding in the power supply path is suppressed.

In the present invention, the driving device is mounted on a moving body.

According to this configuration, in a moving body such as an electric vehicle, the air flow generated during traveling is sent into the gap between the motor and the drive unit, so that the heat radiation action of the motor and the drive unit is improved by the wind.

According to the configuration of the present invention, it is possible to realize a long life and a long driving time by efficiently dissipating heat generated during driving in a compact configuration, and a highly reliable driving device. It is possible to provide. Moreover, it is possible to provide a moving body including a highly reliable electric vehicle equipped with such a drive device.

It is a side view which shows the electric vehicle which is an example of the mobile body carrying the drive device which concerns on embodiment of this invention. FIG. 2 is a vertical sectional front view of a rear wheel portion of the electric vehicle shown in FIG. 1. It is a side view of the drive device shown in FIG. It is a bottom view of the drive device shown in FIG. It is a perspective view of the drive device shown in FIG. FIG. 5 is a partial horizontal cross-sectional view showing a front end portion of the drive device of FIG. 4. FIG. 6 is a perspective view of a drive device similar to FIG. 5, showing a state in which the motor and the drive unit are disassembled. FIG. 8 is a perspective view of a motor and bus bar portion shown in FIG. 7. FIG. 9 is a perspective view of a motor and a bus bar portion similar to FIG. 8 and shows a state in which the bus bar portion is disassembled. It is the perspective view which looked at the drive unit shown in FIG. 5 from the opening part side. It is the perspective view seen from the opening part side of the drive unit similar to FIG. 10, and shows the state which removed the cover.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, an electric motorcycle, which is an electric vehicle, will be described as an example of a moving body equipped with the drive device of the present invention. The front and rear, left and right directions and positions in the description are based on the driver riding on the electric vehicle.

First, the structure of an electric vehicle that is a moving body equipped with a drive device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view showing an electric vehicle which is an example of a moving body equipped with a driving device.

The electric vehicle 1 is a motorcycle having a front wheel 2 and a rear wheel 3 as shown in FIG. The electric vehicle 1 includes a main frame 4 and a swing arm 5 as a main frame.

The front end of the main frame 4 is bent upward, and the front wheel 2 and the handle 6 are supported by the front end so as to be steerable. The handle 6 is provided with a throttle 7 (on the right hand side of the driver) used for acceleration / deceleration of the electric vehicle 1 and a brake lever 8 used for braking.

A seat 9 on which a driver sits down and a battery housing portion 10 are provided at the rear end side of the main frame 4 and at a substantially central portion in the front-rear direction of the electric vehicle 1. The battery accommodating portion 10 is provided below the seat 9 and can accommodate the battery 11 therein. The seat 9 also serves as a lid for the battery housing 10 and is attached to the battery housing 10 so as to be openable and closable. A luggage table 12 is provided behind the seat 9 of the main frame 4 and above the rear wheel 3.

The swing arm 5 extends rearward from the lower part of the seat 9 and the battery housing part 10 at the rear part of the main frame 4. The rear wheel 3 is supported at the rear end of the swing arm 5. The swing arm 5 is provided only on the left side of the rear wheel 3 and supports the rear wheel 3 in a cantilever state. The rear wheel 3 is a drive wheel, and a drive device 20 for driving the rear wheel 3 is provided between the rear wheel 3 and the swing arm 5. The swing arm 5 is a support member that is coupled at its rear end to a coupling portion 57 (see FIG. 4 described later) provided on the drive device 20 and supports the rear wheel 3 via the drive device 20.

Further, the suspension unit 13 of the rear wheel 3 extends from the driving device 20 toward the upper luggage platform 12.

Next, the structure of the rear wheel 3 of the electric vehicle 1 will be described with reference to FIG. 2 in addition to FIG. FIG. 2 is a vertical sectional front view of the rear wheel portion of the electric vehicle.

As shown in FIG. 2, a drive device 20, a speed reduction mechanism 30, a braking mechanism 40, and a rear wheel 3 are provided in order from the left side of the rear wheel 3, that is, the right side in FIG. Yes. The drive device 20 includes a motor 50 and a drive unit 70. The motor 50, the braking mechanism 40, and the rear wheel 3 are arranged so as to be coaxial with each other.

The motor 50 is, for example, a three-phase brushless motor, has a cylindrical shape, and is arranged so that its rotation axis is substantially horizontal. The motor 50 includes a stator 51 which is a stator provided with U-phase, V-phase and W-phase coils 51a, and a rotor 52 which is a rotor provided with a permanent magnet. The axis lines of the stator 51 and the rotor 52 coincide with the axle 3 a of the rear wheel 3. The periphery of the stator 51 including the coil 51a is covered with an insulating mold resin 53. The stator 51 is disposed close to the side of the motor 50 that faces the drive unit 70. The rotor 52 is fixed to a motor shaft 54 that is a rotating shaft, and rotates when the motor 50 is driven to transmit the power to the motor shaft 54.

The drive unit 70 is provided on the left outer side with respect to the rear wheel 3 of the motor 50 in order to drive the motor 50. And the drive unit 70 is exposed so that the outer surface may touch external air like the motor 50 (refer FIG.1 and FIG.2). When the electric vehicle 1 is caused to travel, air flows in the front-rear direction and the motor 50 and the drive unit 70 are blown.

The drive unit 70 includes a control unit (not shown) and an inverter circuit unit 71 composed of a switching element 71a and the like. The control unit is configured by a general microcomputer or the like, and functions as a processor that controls a series of operations related to running of the electric vehicle 1 based on programs and data stored and input in the microcomputer. . The drive unit 70 is configured such that components such as the inverter circuit unit 71 are integrally formed separately from the motor 50, and these components are housed in a unit case 72, which will be described in detail later, to be unitized. ing.

When driving the electric vehicle 1, the control unit of the drive unit 70 sets a target torque for the motor 50 according to the degree of opening of the throttle 7 obtained from the throttle 7 operated by the driver. The control unit controls the inverter circuit unit 71 to adjust the current and voltage to be sent to the motor 50 and drive the motor 50.

The speed reduction mechanism 30 is disposed at a position between the motor shaft 54 and the axle 3a. The speed reduction mechanism 30 is composed of, for example, a planetary gear mechanism.

The braking mechanism 40 is a so-called drum type brake disposed near the wheel 3b of the rear wheel 3, and includes a brake shoe 41, a spring and a brake arm (not shown), and a brake cover 42. The brake shoe 41 is disposed inside the wheel 3b. When the brake mechanism 40 is not used, the brake shoe 41 is spaced radially inward from the wheel 3b by the action of a spring. As the brake arm rotates, the brake shoe 41 is pushed outward in the radial direction with respect to the axle 3a against the elastic force of the spring. The brake shoe 41 generates a frictional resistance between the wheel 3b and a drum (not shown) that rotates integrally with the wheel 3b, and brakes the rotation of the wheel 3b, that is, the rear wheel 3.

In addition, a brake cover 42 is attached as a lid to the portion of the wheel 3b where the brake shoe 41 is disposed, and is covered so that dust and the like do not enter the inside. The brake cover 42 has a function of holding a brake member such as a brake shoe 41, a spring, and a brake arm in addition to a dustproof function for the brake mechanism 40.

Subsequently, detailed configurations of the drive device 20, that is, the motor 50 and the drive unit 70 will be described with reference to FIGS. 3 to 11 in addition to FIGS. 3 is a side view of the drive device 20, FIG. 4 is a bottom view of the drive device 20, FIG. 5 is a perspective view of the drive device 20, FIG. 6 is a partial horizontal sectional view showing the front end of the drive device 20, and FIG. 5 is a perspective view of the drive device 20 similar to FIG. 5, showing a state in which the motor and the drive unit are disassembled, FIG. 8 is a perspective view of the motor 50 and bus bar portions, and FIG. 9 is the same motor 50 and bus bar as FIG. FIG. 10 is a perspective view of the drive bar 70 as seen from the opening side, and FIG. 11 is a perspective view of the drive unit 70 similar to FIG. FIG. 2 is a perspective view showing a state where the lid is removed. In the following description, the identification symbols “U”, “V”, and “W” corresponding to the respective phases of the motor 50 may be omitted unless particularly limited.

The motor 50 and the drive unit 70 are juxtaposed with each other at intervals along the rotational axis direction of the motor 50 as shown in FIGS. The motor 50 and the drive unit 70 are mechanically connected by three connecting columns 21 extending along the axial direction of the motor 50 as shown in FIGS. 4, 5, and 7. Each of the motor 50 and the drive unit 70 is fixed to both ends of the connecting column 21. The motor 50 and the drive unit 70 are electrically connected by a bus bar 90 as shown in FIGS. 6 and 7 in order to transfer power.

The motor 50 includes a motor case 55 and a motor terminal portion 56 as shown in FIGS. 6 to 9 in addition to the stator 51, the rotor 52, the mold resin 53, and the motor shaft 54 described above.

Note that the stator 51 includes the U-phase, V-phase, and W-phase coils 51 a for rotating the rotor 52 as described above, and the periphery thereof is covered with the insulating mold resin 53. The mold resin 53 is made of a thermosetting resin containing, for example, glass fiber. The stator 51 is provided on the side facing the drive unit 70 of the motor 50, that is, close to the left outer side (right side in FIG. 2) with respect to the rear wheel 3 of the motor 50.

The motor case 55 is made of a metal such as an aluminum alloy, and is provided in such a manner that a mold resin 53 covering the stator 51 is held inside. The motor case 55 is composed of two plate-like case members arranged so as to sandwich the mold resin 53 inside, that is, an inner case 55a and an outer case 55b. As shown in FIG. 2, the inner case 55 a is disposed on the rear wheel 3 side of the motor 50, and the outer case 55 b is disposed on the side facing the drive unit 70 opposite to the rear wheel 3 side of the motor 50. The inner case 55a and the outer case 55b are coupled with a molding resin 53 covering the stator 51 with three bolts (not shown) sandwiched inside.

In addition, the motor case 55 exposes the mold resin 53 locally to the outside through an opening 55c provided at a place other than a place where the inner case 55a and the outer case 55b are joined. The opening 55c is provided on the side where the motor shaft 54 does not protrude with respect to the motor 50, that is, the side where the drive unit 70 is disposed. As shown in FIG. 3, when viewed from the side where the motor shaft 54 does not protrude with respect to the motor 50, an opening 55c exists in a region where the disk-shaped motor 50 and the drive unit 70 having a substantially rectangular parallelepiped shape do not overlap. is doing.

Further, the motor case 55 is provided with four connecting portions 57 at the peripheral portion thereof as shown in FIGS. The connecting portion 57 is provided with a screw hole 57a for screwing with a bolt and a nut, and the rear end of the swing arm 5 is connected by screwing as shown in FIG. Yes.

Further, as shown in FIGS. 4, 5, 7 and 8, the motor case 55 is provided with three connecting portions 58 at the periphery thereof. The three connecting portions 58 are arranged in the vertical direction on the front side of the motor 50, and two locations are arranged in the vertical center of the rear end portion. The motor 50 supports the drive unit 70 by connecting one end of the connecting column 21 with a screw through a connecting portion 58.

As shown in FIGS. 6 and 9, the motor case 55 is provided with a motor terminal portion 56 on the side surface of the front end portion thereof facing forward. As shown in FIG. 6, the motor terminal portion 56 has an opening portion 56 a communicating in the radial direction between the inner side and the outer side of the motor case 55, and a terminal plate 59 is attached thereto. The terminal plate 59 holds power terminals 60 (60U, 60V, and 60W) that are electrically connected to the U-phase, V-phase, and W-phase coils 51a of the stator 51 and that are used to transfer power. .

As shown in FIG. 9, the power terminal 60 is provided on the terminal plate 59 of the motor terminal portion 56 on the radially outer side surface on the front side of the motor case 55 so as to be exposed from the motor case 55 toward the front. One end of a bus bar 90 for transferring power to the motor 50, that is, the stator 51, is connected to the power terminal 60 (see FIGS. 6 to 9). For this reason, the screw 60a for connecting the bus bar 90 is attached to the power terminal 60.

In addition to the control unit (not shown) and the inverter circuit unit 71 described above, the drive unit 70 includes a unit case 72 and a terminal unit 73 as shown in FIGS. 6, 7, 10, and 11. .

The unit case 72 is made of an aluminum alloy having a relatively high thermal conductivity, and has an appearance as shown in FIG. As shown in FIG. 11, the unit case 72 has an opening 72a provided on one outer surface of the outer shape having a substantially rectangular parallelepiped shape. The unit case 72 includes a storage portion 74 that is recessed in a concave shape from the opening 72 a toward the inside of the unit case 72. The accommodating part 74 accommodates the inverter circuit part 71 and the inverter circuit board 75 provided with a capacitor (not shown) for smoothing the fluctuation of the DC power, and covers the mounting positions of the electronic components on the substrate. Further, as shown in FIG. 11, the inverter circuit board 75 is disposed at a location close to the opening 72 a of the storage portion 74.

In addition, the location of the opening 72a of the unit case 72 is closed by a lid 76 shown in FIG. The lid 76 is screwed to the unit case 72. The lid 76 is fitted into a step provided on the inner periphery of the opening 72a so as not to protrude outward from the outer surface of the unit case 72 corresponding to the opening 72a.

Further, as shown in FIGS. 4, 5, 7, 10, and 11, the unit case 72 is provided with three connecting portions 77 at the peripheral edge thereof. Three connecting portions 77 are arranged in the vertical direction on the front side of the drive unit 70, and two locations are arranged in the vertical center of the rear end portion. The drive unit 70 is supported by the motor 50 by connecting one end of the connecting column 21 with a screw through a connecting portion 77.

As shown in FIG. 2, in the storage portion 74, each switching element 71 a is arranged on the right inner surface in FIG. 2 of the unit case 72 (the lower side in FIGS. 10 and 11) in order to enhance the heat dissipation effect of the switching element 71 a of the inverter circuit portion 71. Attached to the inner surface). In addition, as a countermeasure against insulation, a highly heat conductive silicon resin sheet material or grease may be interposed between the unit case 72 and the switching element 71a.

Further, as shown in FIGS. 2 to 7, the unit case 72 is provided with a plurality of heat radiation fins 78 as heat radiation portions on the outer surface and on the front side thereof. As shown in FIG. 2, the radiating fins 78 are on the surface opposite to the side facing the motor 50 of the drive unit 70, that is, on the left outer side (right side in FIG. 2) with respect to the rear wheel 3 of the drive unit 70. Is provided. The radiating fins 78 are formed as plate-like members that extend outward (to the right in FIG. 2) so as to be separated from the inverter circuit board 75 and extend in the front-rear direction. The plurality of radiating fins 78 are arranged substantially in parallel so that adjacent radiating fins 78 face each other with an interval in the vertical direction.

As described above, the drive unit 70 is provided on the left outer side with respect to the rear wheel 3 of the motor 50 so that the outer surface thereof is exposed to the outside air (see FIGS. 1 and 2). The drive unit 70 is provided such that the heat radiating fins 78 are exposed toward the upstream side in the air flow direction, that is, the front side in the front-rear direction of the electric vehicle 1 so that wind directly hits the heat radiating fins 78.

Further, as shown in FIGS. 6, 7, and 11, the unit case 72 is provided with a unit terminal portion 73 on the side surface of the front end portion thereof facing forward. The unit terminal portion 73 is connected to the three

substrate terminals

80U, 80V, and 80W of the inverter circuit board 75 via a connection member 79 disposed on the opening 72a side of the inverter circuit board 75.

The connecting member 79 is made of a metal such as copper, and has a flat plate shape extending between the unit terminal portion 73 and each board terminal 80. The connection member 79 is fixed to the unit terminal portion 73 and each board terminal 80 by

screws

81a and 80a. In this way, the unit terminal portion 73 has power terminals 81 (81U, 81V, and 81W) that are electrically connected to the inverter circuit section 71 via the

board terminals

80U, 80V, and 80W and that are used to transfer power. I have.

Note that power lines 14 (14H and 14L) extending from the battery 11 are electrically connected to the inverter circuit board 75 with respect to the drive unit 70 via connection members 79 and

board terminals

80H and 80L (see FIG. 11). ).

The power terminal 81 is provided on the unit terminal portion 73 on the side surface on the front side of the unit case 72 so as to protrude forward from the unit case 72. That is, the power terminal 81 of the drive unit 70 and the power terminal 60 of the motor 50 are provided on the side surfaces facing the same direction. In this case, the

power terminals

81 and 60 are both provided on the side faces facing forward. In addition, you may provide the

power terminals

81 and 60 in the side surface which faces back or upper direction.

One end of a bus bar 90 for transmitting and receiving electric power to the motor 50 is connected to the power terminal 81 (see FIG. 6). For this reason, a screw 81 a for connecting the bus bar 90 is attached to the power terminal 81.

The unit terminal portion 73 is provided with a cover member 82 that covers the periphery of the power terminal 81 and is waterproof and electrically insulating. An opening 82a and a lid 83 for opening and closing the opening 82a are provided at the front end of the cover member 82. As shown in FIG. 7, the power terminal 81 can be seen through the opening 82 a by opening the lid 83, and the operation on the screw 81 a for electrically connecting one end of the bus bar 90 to the power terminal 81. Is possible. The opening 83a can be closed by using a screw 83a for the lid 83, and waterproofing is ensured by closing together with a sheet-like packing 84 on the inner surface of the lid 83.

The bus bar 90 is made of a metal such as copper, for example, and has a flat plate shape extending between the motor terminal portion 56 and the unit terminal portion 73 as shown in FIG. As shown in FIGS. 7 to 9, three bus bars 90 (90 U, 90 V, and 90 W) corresponding to the U phase, the V phase, and the W phase of the three-phase motor 50 are provided. Each bus bar 90 is fixed by

screws

60a and 81a corresponding to each phase at the power terminal 60 of the motor terminal portion 56 and the power terminal 81 of the unit terminal portion 73 (see FIG. 6).

Further, the bus bar 90 includes a cover member 91 that covers the periphery thereof as shown in FIGS. The cover member 91 collectively covers the three

bus bars

90U, 90V, and 90W to ensure waterproofness and electrical insulation.

The cover member 91 includes a connecting portion 91a for connecting to the motor case 55 while covering the motor terminal portion 56 on the motor 50 side as shown in FIG. In the connecting part 91a, the motor terminal part 56 can be closed by using a screw 91b, and the peripheral part of the connecting part 91a is closed together with a sheet-like or ring-shaped packing (not shown). This ensures waterproofness.

Further, a lid 92 is provided in front of the connecting portion 91a of the cover member 91. By opening the lid 92, the power terminal 60 of the motor terminal portion 56 can be seen inside, and an operation on the screw 60a for electrically connecting one end of the bus bar 90 to the power terminal 60 is possible. The lid 92 can be closed at the location of the power terminal 60 by using a screw 92a. By closing the lid 92 together with a sheet-like or ring-like packing (not shown) on the periphery of the lid 92, the lid 92 can be closed. Waterproofness is ensured.

On the other hand, as shown in FIGS. 7 to 9, the other end of the bus bar 90 protrudes from the cover member 91 on the drive unit 70 side of the cover member 91. Then, the bus bar 90 and its cover member 91 are connected so as to be inserted into the cover member 82 of the unit terminal portion 73 from the motor 50 side. Therefore, as shown in FIGS. 6, 10, and 11, the slit 82 b for passing the bus bar 90 and the end of the cover member 91 are inserted into the motor 50 side corresponding to the power terminal 81 of the cover member 82. A recess 82c is provided. When one end of the bus bar 90 and the cover member 91 on the drive unit 70 side is inserted into the recess 82c, the tip of the bus bar 90 reaches the surface of the power terminal 81 through the slit 82b. At this time, as shown in FIG. 6, waterproofness is ensured by inserting the sheet-like or ring-like packing 93 at the front end of the cover member 91 and inserting it into the recess 82 c together.

Note that the cover member 91 may be in the form of a case, or may be a resin molded body in which the bus bar 90 that is an inclusion body is integrated. Each packing used for attaching and connecting the

cover members

82 and 91 itself and attaching and connecting the

lids

83 and 92 may use a liquid sealant.

Thus, since the motor 50 and the drive unit 70 are juxtaposed with each other along the rotation axis direction of the motor 50 and are electrically connected to each other, a gap between the motor 50 and the drive unit 70 is obtained. A space is created in Therefore, even when the motor 50 and the drive unit 70 each serve as a heat generation source, it is possible to prevent the mutual heat transfer due to the existence of a gap space between the motor 50 and the drive unit 70 and suppress the temperature rise. It is. Further, since the air flow generated when the electric vehicle 1 that generates heat from the motor 50 and the drive unit 70 travels is sent into the gap, the heat radiation action of the motor 50 and the drive unit 70 can be improved by the wind.

Further, in the motor 50, a stator 51 having U-phase, V-phase, and W-phase coils 51a for rotating the rotor 52 is provided close to the side of the motor 50 facing the drive unit 70. The space generated between the motor 50 and the drive unit 70 is approached. Therefore, the heat generated from the stator 51, that is, the motor 50 can be radiated to the space where the drive unit 70 exists and in the gap with the drive unit 70. That is, when the rear wheel 3 is disposed close to the motor shaft 54 of the motor 50, a sufficient heat dissipation effect may not be obtained in the direction in which the motor shaft 54 protrudes, that is, the direction where the drive unit 70 is not disposed. There is sex, but it can be avoided.

Further, in the drive unit 70, the radiation fins 78 for radiating heat are provided on the surface opposite to the side facing the motor 50 of the drive unit 70, so that the drive unit 20 is farthest from the rear wheel 3. It will be arranged outside the drive unit 70. Therefore, the heat radiation fins 78 can be easily exposed to the outside air, and the heat radiation action of the drive unit 70 can be improved. In other words, the drive unit 70 may not be able to obtain a large heat dissipation effect due to the motor 50 dissipating heat on the side facing the motor 50, but this can be avoided.

Since the

power terminals

60 and 81 of the motor 50 and the drive unit 70 are provided in the same direction of the motor 50 and the drive unit 70, that is, the side facing the front side, and are electrically connected by the bus bar 90, There is no need to use an electric wire such as a wire harness when connecting the terminals, and the connection work is easy. Further, the bus bar 90 can be a straight line and can have a minimum length, and the terminals can be connected with a minimum distance. Thereby, use of the bus bar 90 shorter than a wire harness is attained. Therefore, in addition to improving the heat dissipation effect of the motor 50 and the drive unit 70, it is possible to suppress the generation of power loss and noise in those power supply paths, and to reduce the number of components and the weight of components.

Furthermore, since the

power terminals

60, 81, the bus bar 90, and the

cover members

82, 91 covering the periphery of the connection points between the

power terminals

60, 81 and the bus bar 90 are provided, the

power terminals

60, 81, Inundation can be easily prevented at the connection point between the bus bar 90 and the

power terminals

60 and 81 and the bus bar 90. That is, water resistance is improved. Therefore, in addition to the improvement of the heat dissipation effect of the motor 50 and the drive unit 70, it is possible to suppress the occurrence of electrical adverse effects due to the flooding in those power supply paths.

According to the configuration of the above-described embodiment, it is possible to realize a long life and a long driving time by efficiently radiating the heat generated during driving while being a compact configuration. It is possible to provide a high driving device 20. Moreover, it is possible to provide the electric vehicle 1 which is a highly reliable moving body equipped with such a drive device 20.

The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

For example, in the embodiment of the present invention, the drive device 20, that is, the motor 50 and the drive unit 70 are mounted on the electric vehicle 1 that is a moving body while being exposed to the outside. The mounting form to 1 is not limited to this. For example, a cover that covers the periphery of the drive device 20 may be provided.

The present invention can be used in a drive device including a motor as a drive source and a drive unit for driving the motor.

1 Electric vehicle (moving body)
20 Driving Device 50 Motor 51 Stator 51a Coil 52 Rotor 53 Mold Resin 54 Motor Shaft (Rotating Shaft)
55 Motor case 56 Terminal part 60 Power terminal 70 Drive unit 71 Inverter circuit part 72 Unit case 73 Terminal part 78 Radiation fin (radiation part)
81 Power terminal 82 Cover member 90 Bus bar 91 Cover member

Claims

A motor and a drive unit for driving the motor,
The motor and the drive unit are juxtaposed with each other along the rotation axis direction of the motor, and are electrically connected to each other.
The motor includes a stator having a coil for rotating the rotor,
The drive device according to claim 1, wherein the stator is provided close to a side of the motor facing the drive unit.
The drive unit includes a heat dissipation part for heat dissipation,
The drive unit according to claim 1, wherein the heat dissipating part is provided on a surface of the drive unit opposite to a side facing the motor.
Each of the motor and the drive unit includes a power terminal for transferring power,
The power terminal of each of the motor and the drive unit is provided on a side surface facing the same direction of the motor and the drive unit, and is electrically connected by a bus bar. The drive device according to claim 3.
The drive device according to claim 4, further comprising a cover member that covers the periphery of each of the power terminal, the bus bar, and a connection portion between the power terminal and the bus bar.
A moving body comprising the driving device according to any one of claims 1 to 5.