WO2014104121A1 - Electric motor and electric pump - Google Patents

Abstract

This electric motor is provided with a brushless motor (20) and a control device (50) integrally connected to an end portion of a motor case (11) in the axial direction. The control device (50) is provided with a bus bar unit main unit (53) having a base portion (54) with a plurality of wired bus bars on the inside and a connector portion (58) integrally provided on the base portion (54) and led outside a housing (10), a motor drive unit (66) that drives a brushless motor (20), and a motor control unit (71) that controls the motor drive unit (66). The motor drive unit (66) is installed on a first main surface (51) of the base portion (54), and the motor control unit (71) is installed on a second main surface (52) of the base portion (54).

Description

Electric motor and electric pump

The present invention relates to an electric motor and an electric pump.
This application is filed in Japanese Patent Application No. 2012-288316 filed in Japan on December 28, 2012, Japanese Patent Application No. 2012-288315 filed in Japan on December 28, 2012, and in Japan on September 30, 2013. Japanese Patent Application No. 2013-204809 filed, Japanese Patent Application No. 2013-003792 filed in Japan on January 11, 2013, Japanese Patent Application No. 2013-242063 filed in Japan on November 22, 2013, 2013 Claiming priority based on Japanese Patent Application No. 2013-244297 filed in Japan on November 26 and Japanese Patent Application No. 2013-243926 filed in Japan on November 26, 2013, the contents of which are incorporated herein by reference. .

For example, an electric pump provided with an electric motor is used to pump oil to a drive motor of an electric vehicle or a hybrid vehicle, a gear box connected to the drive motor, or the like.
Patent Document 1 discloses an electric pump in which a pump rotor of a pump unit is fixed to one end portion of a rotating shaft that is rotatably supported by a housing, and a rotor of an electric motor is fixed to the other end portion of the rotating shaft. There is described an electric pump in which a driver portion for operating an electric motor is accommodated and covered with a cover in a housing space recessed in an end surface of the housing.

The driver part is formed by attaching a large number of components to the board. Among the components attached to the substrate, the large component of the driver unit such as a capacitor is arranged on the substrate so as to be positioned in the recess of the accommodation space.

The housing is provided with a connector portion for supplying electric power to the driver portion. The connector part passes through the inside and outside of the housing, one end is connected to the driver part inside the housing, and the other end surrounds the connection terminal exposed to the outside through the through hole of the housing and the other end of the connection terminal And a connector main body.
A harness derived from an external power source is connected to the connector portion. Thereby, the external power supply outside the housing and the driver part inside the housing are electrically connected via the connection terminals of the connector part, and power is supplied from the external power source to the driver part.

Patent Document 2 discloses a pump unit, a motor unit that drives the pump unit, a conductive motor housing that houses at least the motor unit, and a driver unit that controls the motor unit (corresponding to “control device” in claims). ).

From the opening formed in the end surface of the motor housing, a terminal (corresponding to the “motor power supply terminal” in the claims) for electrical connection between the coil of the motor unit and the substrate of the driver unit is provided in the driver unit. Protrudes to the side. In addition, a terminal bent in a U-shape is embedded in the pedestal of the driver portion by insert molding. Among the U-shaped terminals, one end portion is configured as a terminal portion connected to the substrate, and the other end portion is configured as a connection portion having a convex portion that comes into contact with the terminal when assembled. Further, a through hole for inserting the terminal is formed in the base of the driver unit. When the driver ASSY is fixed to the motor housing, the terminal is inserted through the through hole and comes into contact with the convex portion of the U-shaped terminal, so that the coil can be energized from the substrate.
Thus, according to Patent Document 2, since the terminal of the motor unit and the U-shaped terminal of the driver unit can be electrically connected only by inserting the terminal into the through hole, the manufacturing process can be simplified. It is supposed to be possible.

By the way, an electric pump may be installed and used in a wet environment, for example, in the engine room of a vehicle or in the vicinity of a gear box. Accordingly, the electric motor and the electric pump may be required to be waterproof.

Further, since the electric pump is mounted, for example, in the engine room of the vehicle or in the vicinity of the gear box, the layout may be restricted. Therefore, further miniaturization is required for the electric motor and the electric pump.
For example, as described in Patent Document 1, a brushless motor may be used as such an electric motor. The control device for operating the brushless motor is roughly composed of a driver unit (corresponding to “motor drive unit” in the claims) and a control unit (corresponding to “motor control unit” in the claims). Therefore, in order to accommodate the control device in the housing space of the limited size, it is necessary to consider the layout of the driver unit and the control unit.

Furthermore, in the configuration of Patent Document 2, in order to further improve the reliability of electrical connection, it is necessary to mechanically connect the terminal of the motor unit and the U-shaped terminal of the driver unit, for example, by welding or the like. Although there are various welding methods, resistance welding such as projection welding or spot welding is generally suitable for connecting overlapping terminals. In resistance welding, from both sides of the overlapping direction of both terminals, the main electrode rod and the sub electrode rod are brought into contact with each terminal and pressurized, and the gap between the main electrode rod and the sub electrode rod is interposed via both terminals. This is done by energizing.

JP 2004-353536 A JP 2012-92742 A

In the prior art, it is only described that a large part such as a capacitor is housed in the recess of the housing space. The motor drive unit that drives the motor unit, the motor control unit that controls the motor drive unit, and the noise prevention There is no specific description of the positional relationship between the components, such as the elements and the connector, that make up the control device. Therefore, it can be said that the conventional electric motor and electric pump have room for further miniaturization.

Further, in the conventional electric motor and electric pump, since the joint between the housing and the cover can serve as a water intrusion path, a desired waterproofing means is required at this part, and is connected to the driver part in advance. Since the connection terminal is configured to penetrate the outside of the housing through the through hole of the connector part, water may enter the inside of the housing from the gap between the connection terminal of the connector part and the housing. Therefore, the waterproofness of the electric motor and the electric pump may not be ensured.

Furthermore, in the prior art, since the component parts of the driver part such as the board are arranged behind the U-shaped terminal when viewed from the overlapping direction of both terminals, the U-shaped terminal It is difficult to abut the main electrode or the sub electrode from behind. It is also conceivable to use a specially shaped electrode bar that can be placed between the U-shaped terminal and the component parts of the driver unit, but the cost is higher than the general-purpose electrode bar and the manufacturing cost is increased. The rod must be inserted into a narrow space, which may affect workability when resistance welding.

The present invention provides an electric motor that can be reduced in size and an electric pump including the electric motor.

Also, the present invention provides an electric motor that can prevent water from entering from the connector portion into the housing and ensure waterproofness, and an electric pump including the electric motor.

Furthermore, the present invention provides an electric motor capable of improving workability when resistance welding is performed, and an electric pump including the electric motor.

According to the first aspect of the present invention, an electric motor includes a stator provided inside a motor case that constitutes a part of a housing, and a rotor that is rotatably supported inside the stator in the radial direction. , And a control device that is integrally connected to an axial end of the motor case. The control device includes a base portion in which a plurality of bus bars are wired, a connector portion integrally provided on the base portion, a bus bar unit main body, a motor drive unit that drives the motor portion, A motor control unit for controlling the motor drive unit. The motor drive unit is attached to one side surface of the base portion in the axial direction, and the motor control unit is attached to the other side surface of the base portion in the axial direction.

According to this configuration, since the motor drive unit is attached to one side surface of the base portion and the motor control unit is attached to the other side surface of the base portion, only the one side surface and the other side surface of the base portion are attached. Compared with the case where the motor drive unit and the motor control unit are attached, the area of the one side surface and the other side surface of the base portion can be reduced, and the outer shape of the base portion can be reduced in size. In addition, since a plurality of bus bars are wired inside the base portion, the base portion has a base portion that is more wired than the case where the bus bars are wired while bypassing the motor drive unit and the motor control unit on one side surface and the other side surface of the base portion. The outer shape can be reduced and the base can be made thinner. Therefore, the electric motor can be downsized in the axial direction and the radial direction.

According to the second aspect of the present invention, the housing is provided with a through hole at a position corresponding to the connector portion. The connector portion is integrally provided on one of the one side surface and the other side surface of the base portion, is erected along the axial direction, and is led out of the housing through the through hole.

According to this configuration, since the connector portion is integrally provided on one of the one side surface and the other side surface of the base portion and is erected along the axial direction, the bus bar unit main body is enlarged in the radial direction. The connector portion can be arranged while suppressing the above. Therefore, the electric motor can be further downsized in the radial direction.

According to the third aspect of the present invention, the base portion is formed with a sealing surface around the base end portion of the connector portion, and the connector portion is led out of the housing through the through hole, Between the sealing surface and the housing, a sealing member arranged in an annular shape around the connector portion is sandwiched.

According to this configuration, the connector portion is led out of the housing through the through hole, and the seal member disposed in an annular shape around the connector portion is sandwiched between the seal surface and the housing. It is possible to prevent water that has entered from the gap between the through hole and the through hole from moving outside the seal member. Accordingly, it is possible to prevent water from entering from the connector portion into the housing, and to secure the waterproof property of the electric motor.

According to a fourth aspect of the present invention, a fixing means for fixing the bus bar unit main body to the housing is provided outside the seal member in the base portion, and the fixing means is arranged around the connector portion. Are evenly arranged.

According to this configuration, since the fixing means for fixing the bus bar unit main body to the housing is evenly arranged around the connector portion, when the bus bar unit main body is fixed to the housing, there is no gap between the housing and the sealing surface of the base portion. The seal member interposed between the housing and the base portion can be clamped between the housing and the base portion in a state where the seal member is uniformly pressed around the connector portion. Therefore, it is possible to reliably prevent water from entering from the connector portion to the inside of the housing, and to ensure high waterproofness of the electric motor.

According to the fifth aspect of the present invention, the electric motor may be provided with a noise preventing element constituting the control device on a surface opposite to the connector portion with the base portion interposed therebetween. .

According to this configuration, since the surface opposite to the connector portion across the base portion is a dead space, it is possible to provide a noise prevention element by effectively utilizing the dead space. Accordingly, it is possible to prevent the electric motor from being enlarged when the noise prevention element is provided in the bus bar unit main body.

According to the sixth aspect of the present invention, a control device mounting portion for attaching the control device is provided at one end of the motor case in the axial direction. A cover member that constitutes a part of the housing and covers the control device arrangement portion from one side in the axial direction is provided. The control device disposition portion is provided with a flange portion that projects outward in the radial direction. The connector portion is erected along the axial direction from the other side surface in the axial direction of the base portion. The through hole is formed in the flange portion, and the connector portion is led out of the housing through the through hole.

According to this configuration, since the connector portion is erected along the axial direction from the other side surface in the axial direction of the base portion, the connector portion is suppressed while preventing the bus bar unit body from being enlarged in the radial direction. Can be arranged. At this time, since the opening of the connector portion faces the other side in the axial direction, the harness led from the external power source can be connected to the connector portion from the other side in the axial direction. Interference can be prevented.

According to the seventh aspect of the present invention, a control device mounting portion for attaching the control device is provided at one end of the motor case in the axial direction. A cover member that constitutes a part of the housing and covers the control device arrangement portion from one side in the axial direction is provided. The connector portion is erected along the axial direction from one axial side surface of the base portion. The through hole is formed in the cover member. The connector portion is led out of the housing through the through hole.

According to this configuration, since the connector portion is erected along the axial direction from one side surface in the axial direction of the base portion, the connector portion is suppressed while suppressing the bus bar unit body from being enlarged in the radial direction. Can be arranged. At this time, since the opening of the connector portion faces one side in the axial direction, a harness derived from an external power source can be connected to the connector portion from one side in the axial direction. Interference can be prevented.

According to the eighth aspect of the present invention, the cover member is made of a metal material, and the motor drive unit is connected to the cover member.

According to this configuration, the cover member can have high thermal conductivity by being formed of a metal material. Moreover, since the motor drive unit is connected to the cover member, the heat generated in the motor drive unit can be conducted to the cover member and radiated from the cover member to the outside of the electric motor. Therefore, an electric motor having excellent heat dissipation can be formed.

According to the ninth aspect of the present invention, an electric pump is formed by integrally connecting a pump portion to the other end portion in the axial direction of the motor case, which is a drive source of the electric pump.

According to the tenth aspect of the present invention, an electric pump includes a stator provided inside a motor case that constitutes a part of a housing, and a rotor that is rotatably supported inside the stator in the radial direction. A control unit that is integrally connected to the axial end of the motor case, and a pump unit that is integrally connected to the other end of the motor case in the axial direction, Is provided. The control device includes a base portion in which a plurality of bus bars are wired, a connector portion integrally provided on the base portion, a bus bar unit main body, a motor drive unit that drives the motor portion, A motor control unit for controlling the motor drive unit. The motor drive unit is attached to one side surface of the base portion in the axial direction, and the motor control unit is attached to the other side surface of the base portion in the axial direction.
According to this configuration, a small electric pump can be formed.

Further, according to this configuration, it is possible to form an electric pump that can prevent water from entering from the connector portion into the housing and ensure waterproofness.

According to the electric motor described above, the motor drive unit is attached to one side surface of the base portion, and the motor control unit is attached to the other side surface of the base portion. The area of the one side surface and the other side surface of the base portion can be reduced compared to the case where only the motor drive unit and the motor control unit are attached, and the outer shape of the base portion can be reduced in size. In addition, since a plurality of bus bars are wired inside the base portion, the base portion has a base portion that is more wired than the case where the bus bars are wired while bypassing the motor drive unit and the motor control unit on one side surface and the other side surface of the base portion. The outer shape can be reduced and the base can be made thinner. Therefore, the electric motor can be downsized in the axial direction and the radial direction.

Further, according to the above-described electric motor, the connector part is led out through the through hole of the housing, and the seal member arranged in an annular shape around the connector part is sandwiched between the seal surface and the housing. It is possible to prevent water that has entered from the gap between the connector portion and the through hole from moving outside the seal member. Therefore, it is possible to prevent water from entering from the connector portion into the housing, and to ensure the waterproofness of the electric motor.

It is a perspective view of the electric pump concerning a first embodiment. It is side surface sectional drawing containing the central axis of an electric pump. It is a disassembled perspective view of a housing. It is an external appearance perspective view when a control apparatus is seen from the inner side of a motor case. It is an external appearance perspective view when a control device is seen from the outside of a motor case. It is a top view when a bus-bar unit main body is seen from the 2nd main surface side. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. It is attachment explanatory drawing of a motor control unit. It is side surface sectional drawing containing the central axis of the electric motor which concerns on 2nd embodiment. FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. It is a perspective view when a control apparatus is attached to a control apparatus arrangement | positioning part. It is explanatory drawing of each terminal when it sees from the width direction (side). It is explanatory drawing of each terminal when it sees from an overlap direction. It is explanatory drawing at the time of welding when it sees from the width direction (side). It is explanatory drawing at the time of welding when it sees from an overlap direction. It is explanatory drawing of each terminal which concerns on the modification of embodiment when it sees from an overlap direction.

(First embodiment)
Hereinafter, an electric motor according to a first embodiment of the present invention and an electric pump using the electric motor as a drive source will be described with reference to the drawings.
FIG. 1 is a perspective view of an electric pump 1 according to the first embodiment.
FIG. 2 is a side cross-sectional view including the central axis O of the electric pump 1.
As shown in FIG. 1, the electric pump 1 is for pumping oil to, for example, a drive motor of a hybrid vehicle or a gear box connected to the drive motor, and includes a housing 10 and FIG. As shown in FIG. 2, an electric motor 70 that is housed in the housing 10 and includes a brushless motor 20 (motor unit) and a control device 50 that controls the brushless motor 20, and is driven by the electric motor 70 that is provided outside the housing 10. The pump part 90 is formed. Here, the electric motor 70 and the pump unit 90 have a common central axis with the central axis O of the electric pump 1. In the following description, a direction along the central axis O is referred to as an axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.

The housing 10 is made of a metal material and is formed by die-casting an aluminum material in this embodiment. The housing 10 includes a bottomed cylindrical motor case 11 having an opening 12 on one side in the axial direction and a bottom 13 on the other side in the axial direction, and a cover attached to the opening 12 side of the motor case 11. And the member 46. A brushless motor 20 is disposed inside the motor case 11, and a controller 50 is disposed so as to be integrally connected to an end portion in the axial direction on the opening 12 side of the motor case 11. A pump portion 90 is disposed so as to be integrally connected to the other end (outer end surface 14) which is the bottom 13 side.

The motor case 11 has a substantially cylindrical tube portion 11a, and a stator 21 is fixed to the inner peripheral surface of the tube portion 11a by fixing means such as adhesion or press fitting. The stator 21 is formed by a substantially cylindrical stator core 21a. The stator core 21a is formed by laminating a plurality of metal plates (electromagnetic steel plates) punched in a substantially annular shape in a state of being divided into a predetermined number in the circumferential direction by pressing, for example, and the coil 26 is wound around the stator core 21a. A plurality of teeth 23 are formed radially. In the present embodiment, the stator core 21a is divided into nine. In the present embodiment, nine teeth 23 are formed.
A slot (not shown) is formed between the teeth 23. Nine slots are formed at equal intervals along the circumferential direction. Each tooth 23 is provided with an insulator 25 that is an insulating material over the entire circumference, and a coil 26 corresponding to the three phases of the U phase, the V phase, and the W phase is wound on the insulator 25. That is, the brushless motor 20 of this embodiment is a three-phase brushless motor provided with a three-phase coil 26 of U phase, V phase, and W phase.

A terminal portion of the coil 26 wound around each tooth 23 is drawn toward the opening 12 side of the motor case 11 and connected to a bus burring unit 28 disposed therein.
The bus burring unit 28 is for supplying electric power from the outside to the coil 26, and is formed by embedding a plurality of metal bus burrings 28b in a substantially annular bus burring holder 28a made of an insulating material. ing. In the present embodiment, four bus bar rings 28b are embedded. A terminal portion of a predetermined coil 26 is electrically connected to each bus bar ring 28b and assigned to each phase bus bar. Specifically, a U-phase bus bar, a V-phase bus bar, and a W-phase bus bar connected to a winding start end (not shown) of each phase coil 26, and a winding end end (not shown) of each phase coil 26. ) And a neutral point bus bar to be connected. Of the bus bar rings 28b, the U to W phase bus bars are each provided with power supply terminals 29 (29a to 29c) erected along the axial direction toward the opening 12 side of the motor case 11. The power supply terminals 29a to 29c are electrically connected to the control device 50.
Among the power supply terminals 29a to 29c, the power supply terminal 29b is provided slightly offset to the center side of the opening 12 of the motor case 11 with respect to the power supply terminals 29a and 29c.

At the end of the motor case 11 on the opening 12 side, a bearing holder 4 formed by press-molding a steel plate material is provided to close the opening 12 of the motor case 11. A cylindrical bearing holding portion 4 a disposed inside the bus burring unit 28 is formed at the center of the bearing holder 4. A bearing 5 is fitted in the bearing holding portion 4a.

The bottom 13 of the motor case 11 has a substantially rectangular cross section along the axial direction, and has a predetermined thickness in the axial direction. A shaft insertion hole 13 a that penetrates the bottom portion 13 along the axial direction is formed in the center portion of the bottom portion 13 of the motor case 11. Also, on the bottom portion 13 of the motor case 11, a bearing holding portion 13b having a diameter smaller than that of the cylinder portion 11a and a seal holding portion 13c having a diameter smaller than that of the bearing holding portion 13b are arranged in this order on the opening 12 side. To the bottom 13 side. The bearing 6 is fitted in the bearing holding portion 13b. In addition, a ring-shaped oil seal 7 for preventing oil from entering the motor case 11 is fitted in the seal holding portion 13c.

A rotor 31 is provided inside the stator 21 in the radial direction. The rotor 31 includes a rotating shaft 35, a rotor core 32 fixed to the outer peripheral surface of the rotating shaft 35, a plurality of magnets 33 disposed on the outer peripheral surface of the rotor core 32 along the circumferential direction, and the magnets 33 to the rotor core 32. A magnet cover 33a for holding and a magnet holder 33b are provided. As with the stator 21, the rotor core 32 is configured by laminating a plurality of metal plates (electromagnetic steel plates) punched in a substantially annular shape by, for example, press working in the axial direction. Each magnet 33 is arranged on the outer side in the radial direction of the rotor core 32 so that the magnetic poles are alternately changed in the circumferential direction.

The rotating shaft 35 is supported by a bearing 5 provided on the bearing holder 4 and a bearing 6 provided on the bottom 13 of the motor case 11. Thereby, the rotor 31 is rotatably supported coaxially with the central axis O on the inner side in the radial direction of the stator 21. One end 35 a of the rotating shaft 35 is disposed at the end of the opening 12 of the motor case 11. The other end 35 b of the rotating shaft 35 is inserted through the bearing 6, the oil seal 7, and the shaft insertion hole 13 a and protrudes outward from the outer end surface 14 of the bottom 13 of the motor case 11.

Further, inside the bottom portion 13 of the motor case 11, a suction port 16 that communicates the outside of the motor case 11 that is one side surface 15 a (see FIG. 1) in the radial direction of the bottom portion 13 and the outer end surface 14 of the bottom portion 13; A discharge port 17 is integrally formed. The suction port 16 and the discharge port 17 communicate with each other in a pump portion 90 provided so as to be integrally connected to the outer end surface 14 of the bottom portion 13 of the motor case 11. Thus, as will be described later, when the electric pump 1 fastened and fixed to a mounted body such as a gear box is driven, even if the oil being pumped itself has heat, the heat is sucked into the suction port 16 and the discharge port 17. To the motor case 11 made of a metal material. In particular, the heat of oil can be effectively diffused by forming the motor case 11 from an aluminum material having good thermal conductivity.

The pump unit 90 is, for example, a trochoid pump, and includes a pump case 91 attached to the outer end surface 14 of the motor case 11, an inner rotor 92 and an outer rotor 93 provided in the pump case 91, and a pump case from the outside in the axial direction. And a pump cover 94 covering 91.
The pump case 91 is formed in a frame shape from a metal material such as iron (carbon steel) or aluminum, for example, and the inside is a circular pump storage portion 91a as viewed in the axial direction. The pump storage portion 91a is eccentric with respect to the central axis O. The pump case 91 is fastened by screwing, for example, a plurality of bolts 96 or the like (see FIG. 1) to the outer end surface 14 of the motor case 11, and between the outer end surface 14 of the motor case 11 and the pump case 91. The O-ring 97 is arranged over the entire circumference in the circumferential direction. Thereby, the sealing performance between the outer end surface 14 of the motor case 11 and the pump cover 94 is ensured.

The inner rotor 92 is made of a metal material such as iron (carbon steel) or aluminum, and has a plurality of external teeth. In the present embodiment, the inner rotor 92 has seven external teeth. The inner rotor 92 is supported on the other end 35b of the rotating shaft 35, for example, by two-way machining on the other end 35b, so that the inner rotor 92 is relatively movable in the axial direction and not relatively movable in the circumferential direction. ing.
The outer rotor 93 is formed of a metal material such as iron (carbon steel) or aluminum, for example, like the inner rotor 92, and can mesh with the outer teeth of the inner rotor 92, and there are a plurality of outer rotors 93 larger than the outer teeth of the inner rotor 92. Have internal teeth. In the present embodiment, the outer rotor 93 has eight internal teeth. The outer rotor 93 is formed such that its outer diameter is slightly smaller than the inner diameter of the pump housing portion 91a. As the inner rotor 92 rotates, the outer rotor 93 rotates while a part of the outer peripheral surface of the outer rotor 93 is supported by the inner peripheral surface of the pump housing portion 91a.

A pump chamber 95 is formed between the outer teeth of the inner rotor 92 and the inner teeth of the outer rotor 93 that mesh with each other. The pump chamber 95 is formed so that its volume increases and decreases as the inner rotor 92 and the outer rotor 93 rotate, and communicates with the suction port 16 and the discharge port 17. When the volume of the pump chamber 95 increases, oil is sucked into the pump chamber 95 from the outside of the pump chamber 95 through the suction port 16, and when the volume decreases, the pump chamber 95 passes through the discharge port 17 from the pump chamber 95. Oil is discharged outside.

The pump cover 94 is formed of, for example, a metal material such as iron (carbon steel) or aluminum, and is fixed to the pump case 91 from the outside in the axial direction with a bolt (not shown) or the like. An O-ring 98 is disposed between the pump case 91 and the pump cover 94 over the entire circumference in the circumferential direction. Thereby, the sealing performance between the pump case 91 and the pump cover 94 is ensured.
When the pump case 91 is fastened to the outer end surface 14 of the motor case 11 with a plurality of bolts 96 (see FIG. 1), the O-ring 97 and the O-ring 98 are compressed in the axial direction to exhibit the sealing performance of each part. It is like that.

As shown in FIG. 1, an electric pump mounting portion 15 that projects outward is formed on one side surface 15 a in the radial direction of the bottom portion 13 of the motor case 11. A plurality of mounting holes 15 b are formed in the electric pump mounting portion 15. The electric pump 1 is attached to the attached body by fastening a bolt (not shown) inserted through the attachment hole 15b to the attached body such as a gear box. Thus, the suction port 16 and the discharge port 17 (see FIG. 2) are configured to communicate with the inside of the mounted body and to be able to pressure-feed oil into the mounted body.

FIG. 3 is an exploded perspective view of the housing 10.
As shown in FIG. 3, a control device disposing portion 40 for attaching the control device 50 is provided at the end of the motor case 11 on the opening 12 side and outside the bearing holder 4 in the axial direction. ing. The controller arrangement portion 40 has a substantially rectangular shape having an arrangement opening 41 communicating with the opening 12 of the motor case 11 when viewed from the axial direction, and is formed integrally with the motor case 11. One end portion in the longitudinal direction of the control device disposing portion 40 is a flange portion 42 that is formed to protrude outward in the radial direction of the motor case 11 when viewed from the axial direction. A through hole 43 penetrating in the axial direction is formed at the center of the flange portion 42.

4 is an external perspective view of the control device 50 viewed from the inside of the motor case 11 (see FIG. 3). FIG. 5 is a view of the control device 50 viewed from the outside of the motor case 11 (see FIG. 3). FIG.
As shown in FIGS. 4 and 5, the control device 50 includes a plate-like bus bar unit main body 53 that mainly constitutes a main body portion, a motor drive unit 66 that drives the brushless motor 20 (see FIG. 2), and a motor drive. The motor control unit 71 that controls the unit 66 and a plurality of anti-noise elements 80 that suppress noise of current supplied from an external power source are formed. In the following description, the outer surface of the motor case 11 (see FIG. 3) in the control device 50 is defined as the first main surface 51 (one side surface in the axial direction), which is the opposite side of the first main surface 51. The inner surface of the motor case 11 (see FIG. 3) will be described as the second main surface 52 (the other side surface in the axial direction).

As shown in FIG. 5, the bus bar unit main body 53 includes a base portion 54 made of an insulating material in which a plurality of bus bars 100 are wired and a base portion at a portion corresponding to the flange portion 42 (see FIG. 3) of the housing 10. 54, and a connector portion 58 provided integrally therewith.
The base portion 54 is formed in a substantially rectangular plate shape in plan view, and a plurality of bus bars 100 are provided therein by molding, for example. In the base portion 54, a first bus bar opening 54a is formed at a position corresponding to the power supply terminals 29a to 29c (see FIG. 3), and a second bus bar opening 54b is formed on the connector portion 58 side of the first bus bar opening 54a. The third bus bar opening 54c is formed on the first bus bar opening 54a side of the connector portion 58. The first bus bar opening 54a, the second bus bar opening 54b, and the third bus bar opening 54c are formed so as to penetrate the base portion 54 in the axial direction.

The plurality of bus bars 100 mainly include signal system terminal bus bars 101a to 101d (see FIG. 4), power terminal bus bars 102a and 102b, power bus bars 103a and 103b, three-phase bus bars 104A to 104C, and a ground terminal 105. Each of which is formed by bending a metal plate material such as copper into a desired shape.
As shown in FIG. 4, the signal system terminal bus bars 101a to 101d are molded from the base portion 54 to the connector portion 58, one end portion is disposed in the connector portion 58, and the other end portion is the bus bar unit main body. 53 is erected from the second main surface 52 side, and electrically connects an external control device (not shown) and the motor control unit 71.

As shown in FIG. 5, the power terminal bus bars 102 a and 102 b are similarly molded from the base portion 54 to the connector portion 58, and one end portion is disposed in the connector portion 58. Further, the power terminal bus bars 102 a and 102 b and the power bus bars 103 a and 103 b electrically connect the external power source and the motor drive unit 66 via the anti-noise element 80. In the present embodiment, the power terminal bus bar 102 b and the power bus bar 103 b on the negative electrode side are formed integrally and embedded in the base portion 54.
Part of the power terminal bus bars 102a and 102b is exposed from the third bus bar opening 54c. Further, a part of the power terminal bus bar 102a is erected from the second main surface 52 side of the bus bar unit main body 53, and is electrically connected to the motor control unit 71 (see FIG. 4).
Part of the power bus bars 103a and 103b is exposed from the second bus bar opening 54b and the third bus bar opening 54c. Further, part of the power bus bars 103a and 103b is erected from the second main surface 52 side of the bus bar unit main body 53, and is electrically connected to the motor control unit 71 (see FIG. 4).

The three-phase bus bars 104A to 104C electrically connect the motor drive unit 66 and the power supply terminals 29a to 29c (see FIG. 3) of the bus bar ring unit 28, respectively.
The drive terminals 104A to 104C are respectively extended from the first bus bar openings 54a (see FIG. 5) along the extending direction of the power supply terminals 29a to 29c (hereinafter simply referred to as “extending direction”). . Of the drive terminals 104A to 104C, the drive terminal 104B is provided slightly offset toward the motor drive unit 66 with respect to the drive terminals 104A and 104C so as to be electrically connected to the power supply terminal 29b. In the present embodiment, the extending direction of each of the power supply terminals 29a to 29c coincides with the axial direction. The drive terminals 104A to 104C and the power supply terminals 29a to 29c are electrically and mechanically connected by, for example, projection welding. The connection between the drive terminals 104A to 104C and the power supply terminals 29a to 29c will be described in detail later.

FIG. 6 is a plan view of the bus bar unit main body 53 as viewed from the second main surface 52 side.
As shown in FIG. 6, the bus bar unit main body 53 includes a base portion 54 made of an insulating material in which a plurality of bus bars 100 are wired and a base portion at a portion corresponding to the flange portion 42 (see FIG. 3) of the housing 10. 54, and a connector portion 58 provided integrally therewith.
The base portion 54 is formed in a substantially rectangular plate shape in plan view, and a plurality of bus bars 100 are provided therein by molding, for example. In the base portion 54, a first bus bar opening 54a is formed at a position corresponding to the power supply terminals 29a to 29c (see FIG. 3), and a second bus bar opening 54b is formed on the connector portion 58 side of the first bus bar opening 54a. The third bus bar opening 54c is formed on the first bus bar opening 54a side of the connector portion 58. The first bus bar opening 54a, the second bus bar opening 54b, and the third bus bar opening 54c are formed so as to penetrate the base portion 54 in the axial direction.

The plurality of bus bars 100 mainly include signal system terminal bus bars 101a to 101d, power terminal bus bars 102a and 102b, power bus bars 103a and 103b, three-phase bus bars 104A to 104C, and a ground terminal 105. Each of them is formed by bending a metal plate material such as copper into a desired shape.

The signal system terminal bus bars 101 a to 101 d are molded from the base portion 54 to the connector portion 58, one end portion is disposed in the connector portion 58, and the other end portion is the second main surface 52 of the bus bar unit main body 53. It is erected from the side and electrically connects an external control device (not shown) and a motor control unit 71 (see FIG. 4).

Similarly, the power terminal bus bars 102 a and 102 b are molded from the base portion 54 to the connector portion 58, and one end portion is disposed in the connector portion 58. The power terminal bus bars 102a and 102b and the power bus bars 103a and 103b are electrically connected to an external power source and the motor drive unit 66 (see FIG. 5) via a noise prevention element 80 (see FIG. 5). Yes. In the present embodiment, the power terminal bus bar 102 b and the power bus bar 103 b on the negative electrode side are formed integrally and embedded in the base portion 54.

Part of the power terminal bus bars 102a and 102b is exposed from the third bus bar opening 54c. Further, a part of the power terminal bus bar 102a is erected from the second main surface 52 side of the bus bar unit main body 53, and is electrically connected to the motor control unit 71 (see FIG. 4).

Part of the power bus bars 103a and 103b is exposed from the second bus bar opening 54b and the third bus bar opening 54c. Further, part of the power bus bars 103a and 103b is erected from the second main surface 52 side of the bus bar unit main body 53, and is electrically connected to the motor control unit 71 (see FIG. 4).

The three-phase bus bars 104A to 104C electrically connect the motor drive unit 66 and the power supply terminals 29a to 29c (see FIG. 3) of the bus bar ring unit 28, respectively.
As shown in FIG. 3, one end portions of the three-phase bus bars 104A to 104C are erected from the first bus bar opening 54a (see FIG. 6) toward the outside of the housing 10 along the power supply terminals 29a to 29c, respectively. Has been. One end portions of the three-phase bus bars 104A to 104C are connected to the power supply terminals 29a to 29c by, for example, welding. As shown in FIG. 6, the other end portions of the three-phase bus bars 104A to 104C are arranged in parallel with the end portions of the power bus bars 103a and 103b and are exposed from the second bus bar opening 54b.

The ground terminal 105 is a terminal for securing the ground of the power circuit, and is connected to the ground terminal from the second main surface 52 of the bus bar unit main body 53 at a position corresponding to the flange portion 42 (see FIG. 3) of the motor case 11. It is exposed to the outside through the opening 54d. The ground terminal 105 includes an annular fixing portion 105a and an extension portion 105b extending from the negative power terminal bus bar 102b toward the fixing portion 105a. For example, the negative power terminal is made of a metal material such as copper. It is integrally formed with the bus bar 102b.

FIG. 7 is a cross-sectional view taken along line AA in FIG. In FIG. 7, a state in which the control device 50 is attached to the motor case 11 is illustrated.
As shown in FIG. 7, the fixing portion 105 a of the ground terminal 105 is fastened and fixed to the flange portion 42 of the motor case 11 by the ground bolt 106. Since the ground terminal 105 made of copper is directly fastened and fixed to the flange portion 42, the ground of the power supply circuit can be secured with a small resistance value.
Further, in the extension portion 105b, the vicinity of the connection portion with the fixed portion 105a is formed in a substantially crank shape in a side sectional view and can be easily elastically deformed. Accordingly, even if the relative position is displaced between the control device 50 and the motor case 11 due to, for example, thermal expansion or vibration, the extension portion 105b is elastically deformed, so that stress concentration on the ground terminal 105 can be avoided. Therefore, the vibration resistance, heat resistance and thermal shock characteristics of the control device 50 can be improved.

As shown in FIG. 5, the motor drive unit 66 is tapped, for example, in a region corresponding to the disposition opening 41 (see FIG. 3) of the control device disposition portion 40 on the first main surface 51 of the base portion 54. It is attached by screws 66a. The motor drive unit 66 is formed in a substantially rectangular shape in plan view, and includes, for example, a switching element such as an FET (Field effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). Built in.

A terminal row 67 is provided on one side surface of the motor drive unit 66 on the first bus bar opening 54a side. Some of the terminals constituting the terminal row 67 are formed in a substantially L shape, and are directed from the first main surface 51 side of the base portion 54 to the second main surface 52 side via the plurality of through holes 54e. The end portion 67 </ b> A protrudes from the second main surface 52. Of the terminals constituting the terminal row 67, the three three- phase terminals 67a, 67b, and 67c are each formed in a substantially crank shape, and the three-phase bus bars 104A to 104C exposed from the second bus bar openings 54b. It is electrically connected to the other end. Of the terminals constituting the terminal row 67, the two power terminals 67d and 67e are connected to the ends of the power bus bars 103a and 103b that are formed in a substantially crank shape and exposed from the second bus bar opening 54b. Is done.
The motor drive unit 66 converts the DC power input from the power terminals 67d and 67e into a three-phase AC and outputs it from the three- phase terminals 67a, 67b and 67c in a desired energization pattern.
On the main surface on the outside of the motor drive unit 66, a heat dissipation sheet 68 made of, for example, silicone rubber is attached.

As shown in FIG. 6, in the second main surface 52 of the base portion 54, a recessed portion 52 a that is recessed by one step is formed in a region corresponding to the opening 41 for placement of the control device placement portion 40 (see FIG. 3). Has been.
As shown in FIG. 4, a motor control unit 71 is disposed at a position corresponding to the recess 52a. The motor control unit 71 is formed by mounting electronic elements (not shown) on a substantially rectangular plate-like multilayer substrate 72 in which wiring is printed on glass epoxy, for example. On the multilayer substrate 72 of the motor control unit 71, the other ends of the signal system terminal bus bars 101a to 101d (see FIG. 6) erected from the second main surface 52, and the power bus bars 103a and 103b (see FIG. 6). A plurality of through-holes 72b into which a part (hereinafter collectively referred to as “projecting terminal 100a of bus bar 100”) and an end 67A of terminal row 67 of motor drive unit 66 are inserted are formed.

Incidentally, when the motor control unit 71 is attached to the base portion 54, it is necessary to insert the protruding terminals 100a of the plurality of bus bars 100 and the end portions 67A of the terminal rows 67 into the through holes 72b while positioning the multilayer substrate 72. Conventionally, for example, a positioning pin is provided on the base portion 54 side, a positioning hole is provided on the motor control unit 71 side, and the protruding terminal 100a and terminal row 67 of the bus bar 100 are inserted into the through hole 72b while the positioning pin is inserted into the positioning hole. The work of inserting the end 67 </ b> A was performed. However, when the motor control unit 71 is attached to the base portion 54, the positioning pin on the base portion 54 side is hidden behind the motor control unit 71. Therefore, it is difficult to insert the positioning pin into the positioning hole, and there is room for improvement in workability. was there.

Therefore, a pair of notches 73 and 73 for positioning are provided on the edge 72a on the first bus bar opening 54a side in the multilayer substrate 72. Further, the base portion 54 is provided with a wall portion 59a at a position corresponding to the edge portion 72a of the multilayer substrate 72 at the periphery of the first bus bar opening 54a, and a pair at a position corresponding to the notch portion 73 of the multilayer substrate 72. Positioning pins 59b and 59c are provided.

The wall 59 a extends along the edge 72 a of the multilayer substrate 72. The wall portion 59a is formed to be higher than the height of the protruding terminals 100a of the plurality of bus bars 100 erected from the second main surface 52 and the end portion 67A of the terminal row 67 of the motor drive unit 66. .
Of the pair of positioning pins 59b and 59c, one positioning pin 59b is provided integrally with the wall 59a, and the other positioning pin 59c is provided on the side of the wall 59a. The pair of positioning pins 59b and 59c are formed to have a height equivalent to that of the wall portion 59a.

FIG. 8 is an explanatory view of attachment of the motor control unit 71.
The motor control unit 71 is attached to the base portion 54 as follows. That is, as shown in FIG. 8, first, the positioning pins 59 b and 59 c are inserted into the notches 73 and 73 of the multilayer substrate 72 in a state where the multilayer substrate 72 is inclined with respect to the second main surface 52 of the base portion 54. Abut.
Next, while moving the multilayer substrate 72 toward the second main surface 52 of the base portion 54, the protruding terminals 100 a of the plurality of bus bars 100 and the terminal rows 67 of the motor drive unit 66 are inserted into the through holes 72 b of the multilayer substrate 72. The end 67A is inserted.

Finally, the protruding terminals 100a of the plurality of bus bars 100 inserted into the respective through holes 72b and the end portions 67A of the terminal rows 67 of the motor drive unit 66 are joined to the multilayer substrate 72 by, for example, soldering, tapping screws, etc. Thus, the motor control unit 71 is fixed to the base portion 54. Thus, the attachment of the motor control unit 71 to the base portion 54 is completed. Thus, while easily positioning the motor control unit 71, the protruding terminals 100a of the plurality of bus bars 100 and the end portions 67A of the terminal row 67 of the motor drive unit 66 can be reliably inserted into the through holes 72b. Therefore, good workability can be secured when the motor control unit 71 is attached to the base portion 54.

As shown in FIG. 2, the connector portion 58 is located on the second main surface 52 of the base portion 54 corresponding to the flange portion 42 of the housing 10 from the second main surface 52 toward the bottom portion 13 of the housing 10. It is erected along the axial direction. As shown in FIG. 6, the connector portion 58 has a substantially rectangular opening, and one end portions of the signal system terminal bus bars 101a to 101d and one end portions of the power terminal bus bars 102a and 102b are arranged inside. ing. As shown in FIG. 3, the connector portion 58 is led out of the housing 10 through the through hole 43 of the flange portion 42 when the control device 50 is attached to the control device arrangement portion 40.

Here, as shown in FIG. 4, a seal surface 55 is formed around the base end portion of the connector portion 58 on the second main surface 52 side of the base portion 54. The seal surface 55 is formed on a flat surface orthogonal to the central axis O (see FIG. 2). As shown in FIG. 3, a seal member 56 disposed in an annular shape around the connector portion 58 is sandwiched between the seal surface 55 of the base portion 54 and the flange portion 42 of the housing 10. The seal member 56 is an annular O-ring. The seal member 56 is fitted into a ring groove 44 formed so as to surround the through hole 43 of the flange portion 42, and is slightly crushed by the seal surface 55 of the base portion 54. As a result, the sealing member 56 ensures sealing performance around the connector portion 58 and prevents water that has entered from the gap between the connector portion 58 and the through hole 43 of the flange portion 42 from moving outside the sealing member 56. is doing.

As shown in FIG. 5, in the control device 50, pipe-shaped collar members 57a to 57d made of a metal material are insert-molded at the four corners of the base portion. Each of the color members 57a to 57d includes a cylindrical color main body 57e and a flange portion 57f provided at one axial end of the color main body 57e. The flange portion 57f is connected to the second main surface 52 side of the base portion 54. It is provided to become. As shown in FIG. 3, the control device 50 inserts the bolts 111 into the respective color members 57a to 57d and fastens them to the control device disposing portion 40, whereby the axial opening 12 in the motor case 11 is obtained. It is integrally connected to the side end. Here, due to the flange portions 57f (see FIG. 4) of the respective color members 57a to 57d, the contact area (seat surface area) between the respective color members 57a to 57d and the control device disposing portion 40 is increased, and the fastening force between the two is determined. Has come to improve.

Here, in the present embodiment, as shown in FIG. 6, among the color members 57a to 57d, the color members 57a and 57b (fixing means) provided on the connector part side are symmetrical with the connector part 58 interposed therebetween. Are provided and arranged around the connector portion 58 evenly. Therefore, as shown in FIG. 3, when the bolts 111 (fixing means) are respectively inserted into the collar members 57a and 57b and fastened to the control device mounting portion 40, a fastening load is evenly generated around the connector portion 58. . As a result, the seal member 56 disposed in an annular shape around the connector portion 58 is crushed substantially uniformly over the entire circumference by the flange portion 42 of the housing 10 and the seal surface 55 of the base portion 54. Therefore, high sealing performance can be secured over the entire circumference around the connector portion 58.
Note that the color members 57a to 57d may be disposed inside the region connecting the four color members 57a to 57d shown in FIG. Also by this, the fastening load of the bolt 111 (see FIG. 3) can be generated substantially uniformly to ensure high sealing performance.

As shown in FIG. 5, a dead space is formed on the first main surface 51 on the opposite side of the connector portion 58 across the base portion 54, and a plurality of noise prevention devices constituting the control device 50 are formed in this portion. An element 80 is provided. Each noise prevention element 80 includes, for example, an X capacitor 87, smoothing capacitors 88 and 88, and a choke coil 81. The X capacitor 87, the smoothing capacitors 88 and 88, and the choke coil 81 are respectively housed in the noise prevention element housing portions 60a to 60d formed in a substantially bathtub shape on the first main surface 51.

The X capacitor 87 is provided mainly for suppressing radio noise. The X capacitor 87 is, for example, a substantially cylindrical electrolytic capacitor, and is provided between the power terminal bus bars 102a and 102b (see FIG. 6). The X capacitor 87 is arranged such that the center axis thereof is along the longitudinal direction of the base portion 54. A pair of lead portions 87a and 87b extend substantially in parallel from the end surface of the X capacitor 87 on the motor drive unit 66 side.
The pair of lead portions 87a and 87b are formed in a substantially crank shape in a side view. The ends of the pair of lead portions 87a and 87b are disposed in the third bus bar opening 54c and connected to the power terminal bus bars 102a and 102b by, for example, projection welding.

A safety valve (not shown) is provided on the end surface 87c of the X capacitor 87 opposite to the motor drive unit 66 side. Specifically, the safety valve of the X capacitor 87 is composed of a groove having a predetermined shape formed on the end face 87c. When the internal pressure of the X capacitor 87 rises to a predetermined value or more due to heat generation, the safety valve It is open to the base point.

The smoothing capacitor 88 is provided to suppress a change in voltage caused by driving the brushless motor 20 (see FIG. 2). As with the X capacitor 87, the smoothing capacitor 88 is, for example, a cylindrical electrolytic capacitor, and a pair of smoothing capacitors 88 are provided between the power bus bars 103a and 103b. As with the X capacitor 87, the smoothing capacitor 88 is arranged so that its central axis is along the longitudinal direction of the base portion 54. A pair of lead portions 88a and 88b extend substantially in parallel from the end surface of the smoothing capacitor 88 on the motor drive unit 66 side. The pair of lead portions 88a and 88b are formed in a substantially crank shape in a side view. The ends of the pair of lead portions 88a and 88b are disposed in the third bus bar opening 54c and connected to the power bus bars 103a and 103b by, for example, projection welding.

On the end surface 88c of the smoothing capacitor 88 opposite to the motor drive unit 66 side, a safety valve (not shown) is provided. The safety valve of the smoothing capacitor 88 is configured in the same manner as the safety valve of the X capacitor 87, and is opened when the internal pressure of the smoothing capacitor 88 rises above a predetermined value due to heat generation or the like.

The choke coil 81 is provided mainly for suppressing radio noise. The choke coil 81 is formed by winding a conducting wire 83 around a cylindrical core 82 made of a magnetic material such as ferrite, and is provided between the power terminal bus bar 102a and the power bus bar 103a. In the core 82, the motor drive unit 66 side is the winding start side of the conducting wire 83, and the opposite side of the motor drive unit 66 is the winding end side of the conducting wire 83.

The conducting wire 83 of the choke coil 81 extends substantially in parallel toward the motor drive unit 66 such that one end 83a and the other end 83b are along the central axis of the core 82, respectively.
One end portion 83a and the other end portion 83b of the conductive wire 83 are formed in a substantially crank shape in a side view, and are disposed in the third bus bar opening 54c. For example, the power terminal bus bar 102a and the power Connected to bus bar 103a.

Incidentally, when the choke coil 81 is formed, the conducting wire 83 is wound around the core 82 from the one end 83a side. The other end portion 83 b of the conducting wire 83 is bent at the winding end side of the core 82, and is drawn out to the motor drive unit 66 side (the winding start side of the core 82) opposite to the winding end side of the core 82. . At this time, since the conducting wire 83 is wound in a coil shape, a springback acts on the other end portion 83 b of the conducting wire 83 in a direction away from the one end portion 83 a of the conducting wire 83. As a result, deviation occurs in the positions of the one end 83a and the other end 83b of the conducting wire 83 of the choke coil 81, and it is difficult to accurately weld the conducting wire 83 to the power terminal bus bar 102a and the power bus bar 103a. There is a risk.

Therefore, a pair of guides is provided between the third bus bar opening 54c and the noise prevention element storage portion 60d so as to extend in the extending direction of the power terminal bus bar 102a and the power bus bar 103a in the third bus bar opening 54c. Grooves 61 and 61 are provided. The pair of guide grooves 61, 61 are formed by standing a pair of walls 61a, 61a, respectively.
One end 83a and the other end 83b of the conducting wire 83 can be arranged in the pair of guide grooves 61, 61, respectively. Since the one end 83a and the other end 83b of the conducting wire 83 are positioned in the pair of guide grooves 61 and 61, respectively, the choke coil 81 is positioned relative to the power terminal bus bar 102a and the power bus bar 103a. The conducting wire 83 can be easily and accurately welded.

As shown in FIG. 3, the cover member 46 is fastened and fixed to, for example, a bolt 112 with respect to the control device arrangement portion 40, and covers the control device arrangement portion 40 and the control device 50 from the outside in the axial direction. Yes.
The cover member 46 is made of a metal material such as iron (carbon steel), aluminum, or copper. In particular, the cover member 46 is preferably formed of aluminum having high thermal conductivity, light weight, and low cost. The cover member 46 is formed in a substantially bathtub shape by a peripheral wall 47 disposed in a rectangular frame around the central axis O corresponding to the control device disposing portion 40 and a bottom wall 48 facing in the axial direction. . Between the peripheral wall 47 of the cover member 46 and the control device disposing portion 40, an O-ring 99 is disposed over the entire circumference in the circumferential direction. The O-ring 99 is fitted into a ring groove 47a (see FIG. 2) formed on the front end surface of the peripheral wall 47 of the cover member 46, and is slightly crushed when the cover member 46 is fastened by the bolt 111, thereby providing a sealing property. Demonstrate. Thereby, the sealing property between the control apparatus arrangement | positioning part 40 and the cover member 46 is ensured.

The bottom wall 48 of the cover member 46 is provided with a breathing hole 45 that communicates the inside and outside of the housing 10. The breathing hole 45 is for releasing the pressure to the outside of the housing 10 when the inside of the housing 10 becomes a pressure higher than the outside of the housing 10 due to, for example, expansion of air accompanying a temperature rise.

In addition, the breathing hole 45 is provided at a position facing the step surface 51a of the first main surface 51 of the control device 50 so as to avoid an obstacle that hinders the breathing function, thereby allowing gas to flow into the control device 50. It has come to be smooth.

A plurality of cooling fins 49 are integrally formed on the outer surface of the bottom wall 48 of the cover member 46. The cooling fins 49 radiate heat generated by the control device 50.
Here, as shown in FIG. 2, the motor drive unit 66 attached to the first main surface 51 side of the control device 50 contacts the inner side surface 48 a of the bottom wall 48 of the cover member 46 via the heat radiation sheet 68. It is supposed to be. Thus, the motor drive unit 66 can dissipate heat from the cooling fins 49 of the cover member 46 efficiently by transferring heat to the cover member 46 via the heat dissipation sheet 68.
Further, since the cover member 46 is fastened and fixed to the control device arrangement portion 40 of the housing 10, the heat generated by the control device 50 is radiated through the cooling fins 49 of the cover member 46 and the cover member 46. Compared with the above, the volume is large, and the aluminum housing 10 having a high thermal conductivity is also drawn by heat and diffused, so that the cooling performance of the control device 50 can be further enhanced.

(Effects of the first embodiment)
According to the first embodiment, the motor drive unit 66 is attached to the first main surface 51 of the base portion 54 and the motor control unit 71 is attached to the second main surface 52 of the base portion 54. The first main surface 51 and the second main surface 52 of the base portion 54 than when the motor drive unit 66 and the motor control unit 71 are attached to only one of the first main surface 51 and the second main surface 52. Can be reduced, and the outer shape of the base portion 54 can be reduced. In addition, since the plurality of bus bars 100 are wired inside the base portion 54, the bus bars are bypassed while bypassing the motor drive unit 66 and the motor control unit 71 on the first main surface 51 and the second main surface 52 of the base portion 54. Compared with the case where 100 is wired, the outer shape of the base portion 54 can be reduced, and the base portion 54 can be made thinner. Therefore, the electric motor 70 can be downsized in the axial direction and the radial direction.

Moreover, since the connector part 58 is integrally provided in the 2nd main surface 52 of the base part 54, and is standingly arranged along the axial direction, it suppresses that the bus-bar unit main body 53 enlarges to radial direction. The connector portion 58 can be disposed while being disposed. Therefore, the electric motor 70 can be further downsized in the radial direction. At this time, since the opening of the connector portion 58 faces the bottom portion 13 side of the motor case 11, a harness (not shown) derived from an external power source (not shown) is connected from the bottom portion 13 side of the motor case 11 to the connector portion 58. Since connection is possible, interference between the connector portion 58 and peripheral devices can be prevented.

Further, since the first main surface 51 on the opposite side of the connector portion 58 across the base portion 54 is a dead space, the dead space is effectively used to make the X capacitor 87, which is the anti-noise element 80, smooth. Capacitors 88 and 88 and a choke coil 81 can be provided.
Therefore, it is possible to prevent the electric motor 70 from being enlarged when the noise prevention element 80 is provided in the bus bar unit main body 53.

Moreover, the cover member 46 can have a high thermal conductivity by being formed of a metal material, particularly an aluminum material. Further, since the motor drive unit 66 is connected to the cover member 46 via the heat radiating sheet 68, the heat generated in the motor drive unit 66 is conducted to the cover member 46, so that the cover member 46 and the outside of the electric motor 70 are transmitted. Can dissipate heat. Therefore, the electric motor 70 having excellent heat dissipation can be formed.
Further, since the cover member 46 is fastened and fixed to the control device arrangement portion 40 of the housing 10, the heat generated by the control device 50 is radiated from the cooling fins 49 of the cover member 46 and compared to the cover member 46. Therefore, the cooling performance of the control device 50 can be further improved because the heat is drawn and diffused to the aluminum housing 10 side having a large volume and high thermal conductivity.

Further, since the electric motor 70 that can be reduced in size is provided as a drive source of the pump unit 90, a small electric pump 1 can be formed.

(Second embodiment)
Next, the electric motor 70 according to the second embodiment will be described.
FIG. 9 is a side sectional view including the central axis O of the electric motor 70 according to the second embodiment.
In the electric motor 70 of the first embodiment, the connector portion 58 is erected from the second main surface 52 of the base portion 54 toward the bottom portion 13 of the motor case 11 (see FIG. 2).
On the other hand, as shown in FIG. 9, in the electric motor 70 of the second embodiment, the connector portion 58 stands from the first main surface 51 of the base portion 54 toward the side opposite to the bottom portion 13 of the motor case 11. This is different from the first embodiment. Detailed description of the same components as those in the first embodiment will be omitted, and only different portions will be described.

As shown in FIG. 9, the electric motor 70 of the second embodiment includes a cover member 46 that covers the control device arrangement portion 40 and the control device 50 from the outside in the axial direction. A through hole 46 a is formed in the cover member 46 at a position corresponding to the connector portion 58 erected from the first main surface 51 of the base portion 54. The connector part 58 is led out of the housing 10 through the through hole 46a. A rotary pump 35 protruding from the bottom 13 of the electric motor 70 is connected to a pump unit (not shown) provided as a separate body. Thereby, the electric motor 70 of 2nd embodiment is used as the drive source of a pump part.

Here, on the first main surface 51 side of the base portion 54, a seal surface 55 is formed around the base end portion of the connector portion 58. A seal member 56 that is annularly arranged around the connector portion 58 is sandwiched between the seal surface 55 of the base portion 54 and the inner side surface 48 a of the bottom wall 48 of the cover member 46. The seal member 56 is fitted into a ring groove 46 b formed so as to surround the through hole 46 a of the cover member 46 and is slightly crushed by the seal surface 55 of the base portion 54. As a result, the sealing member 56 ensures sealing performance around the connector portion 58 and prevents water that has entered from the gap between the connector portion 58 and the through hole 46a of the cover member 46 from moving outside the sealing member 56. is doing.

(Effect of the second embodiment)
According to the second embodiment, since the connector portion 58 is erected along the axial direction from the first main surface 51 of the base portion 54, the bus bar unit main body 53 is prevented from being enlarged in the radial direction. The connector portion 58 can be disposed while being disposed. At this time, since the opening of the connector portion 58 faces the outside of the cover member 46 in the axial direction, the harness (not shown) derived from the external power source (not shown) is connected to the outside of the cover member 46 in the axial direction. It can be connected to the connector part 58.

Therefore, water can enter from the connector portion 58 into the housing 10, and the electric motor 70 can be further reduced in the radial direction.

(Third embodiment)
Next, a third embodiment will be described. Detailed description of the same components as those in the first embodiment and the second embodiment will be omitted, and only different portions will be described.

FIG. 10 is a cross-sectional view taken along line BB in FIG.
As shown in FIG. 10, the X capacitor 87 is fixed to the bottom 62 a of the noise prevention element storage 60 a via an adhesive 89.
The adhesive 89 has, for example, silicone as a main component and high thermal conductivity. Thereby, even if the X capacitor 87 generates heat, excellent heat dissipation characteristics can be exhibited.
The material of the adhesive 89 is not limited to silicone, and is preferably a material having excellent heat dissipation characteristics.
In addition, the adhesive 89 has excellent wet spreading and adhesion to the surface of the insulating material (for example, a resin material such as PBT (polybutylene terephthalate)) and the X capacitor 87 forming the bus bar unit main body 53. ing. Thereby, since it can prevent that the adhesive agent 89 peels from the bottom part 62a and the X capacitor | condenser 87 of the noise prevention element accommodating part 60a, the outstanding vibration resistance and the thermal radiation characteristic are securable.

Here, a concave portion 64a that is recessed in a direction away from the end face 87c (downward in FIG. 10) is formed at a position corresponding to the safety valve of the X-capacitor 87 at the bottom 62a of the noise prevention element storage portion 60a. Note that a wall portion 65 for defining a predetermined application range of the adhesive applied to the bottom portion 62a of the noise prevention element storage portion 60a is provided at a boundary portion between the noise prevention element storage portion 60a and the recess 64a. . The application amount and the application position of the adhesive 89 are controlled in the manufacturing process, but the anti-noise element is accommodated by a slight change in the manner in which the X capacitor 87 is installed in the anti-noise element storage part 60a and its position. Although it may overflow outside the predetermined application range of the portion 60a, the adhesive 89 overflowed by the concave portion 64a is received. The amount of depression (that is, the depth) of the depression 64 a is determined in accordance with the amount of adhesive 89 applied. More specifically, the amount of depression of the recess 64a is determined when the adhesive 89 is applied to the bottom 62a of the noise prevention element storage 60a and the X capacitor 87 is inserted into the noise prevention element storage 60a in the manufacturing process. The volume of the adhesive 89 overflowing from the bottom 62a of the noise prevention element storage 60a is set to be able to be stored. This volume is set so as to be acceptable even when the adhesive 89 overflowing from the bottom 62a reaches the level indicated by the broken line in FIG. As a result, the adhesive 89 can be reliably prevented from adhering to the safety valve of the X capacitor 87, and the function of the safety valve is not hindered.

As shown in FIG. 5, the smoothing capacitor 88 is fixed to the bottoms of the noise prevention element storage portions 60b and 60c via an adhesive 89 (see FIG. 10), similarly to the X capacitor 87. Since the configuration, action, and effect of the adhesive 89 are as described above, description thereof is omitted.
In addition, recesses 64b and 64c that are recessed in the direction away from the end face 87c are formed at the bottoms of the noise prevention element storage portions 60b and 60c, respectively, at positions corresponding to the safety valves of the smoothing capacitor 88. The configuration, operation, and effect of the recesses 64b and 64c are the same as those of the recess 64a described above, and thus description thereof is omitted.

(Effect of the third embodiment)
According to the third embodiment of the present invention, in addition to the effects obtained in the first embodiment and the second embodiment, the following effects can be obtained.
That is, according to the third embodiment, the signal system terminal bus bars 101a to 101d protruding from the connector part 58 and the power terminal bus bars 102a and 102b are molded in the connector part 58 (in the base part 54). On the other hand, the connector portion 58 is led out of the housing 10 through the through-hole 43, and a seal member 56 disposed in an annular shape around the connector portion 58 is sandwiched between the seal surface 55 and the flange portion 42 of the housing 10. Therefore, it is possible to prevent water that has entered from the gap between the connector portion 58 and the through hole 43 from moving outside the seal member 56. Therefore, it is possible to prevent water from entering the housing 10 from the connector portion 58 and to secure the waterproof property of the electric motor 70.

Further, since the collar members 57a and 57b for fixing the bus bar unit main body 53 to the housing 10 with the bolts 111 are evenly arranged around the connector portion 58, the bus bar unit main body 53 is attached to the control device arrangement portion 40 of the housing 10. When fixed, the sealing member 56 interposed between the housing 10 and the sealing surface 55 of the base portion 54 can be sandwiched between the housing 10 and the base portion 54 in a state where the sealing member 56 is pressed evenly around the connector portion 58.
Therefore, it is possible to reliably prevent water from entering the housing 10 from the connector portion 58 and to secure the high waterproof property of the electric motor 70.

Further, since the electric motor 70 capable of preventing the intrusion of water from the connector portion 58 into the housing 10 is provided as a drive source of the pump portion 90, the ingress of water from the connector portion 58 to the inside of the housing 10 is prevented. The electric pump 1 that can ensure waterproofness can be formed.

(Fourth embodiment)
Subsequently, a fourth embodiment of the present invention will be described. Detailed description of the same components as those of the first embodiment, the second embodiment, and the third embodiment will be omitted, and only different portions will be described.

FIG. 11 is a perspective view when the control device 50 is attached to the control device arrangement portion 40. In addition, in FIG. 11, illustration of the cover member 46 (refer FIG. 3) is abbreviate | omitted.
As shown in FIG. 11, when the control device 50 is attached to the control device mounting portion 40, the drive terminals 104A to 104C and the power supply terminals 29a to 29c are arranged so as to overlap each other in the thickness direction. Has been. At this time, the power supply terminals 29a to 29c are arranged on the outer side (the side opposite to the motor drive unit 66), and the drive terminals 104A to 104C are arranged on the inner side (the motor drive unit 66 side). In the following description, the power supply terminals 29a to 29c in the overlapping direction of the drive terminals 104A to 104C and the power supply terminals 29a to 29c are referred to as “front”, and the drive terminals 104A to 104C are referred to as “rear”. . A direction orthogonal to the overlapping direction and the extending direction is referred to as a “width direction”.

FIG. 12 is an explanatory diagram of each terminal (only the power supply terminal 29b and the drive terminal 104B are shown) when viewed from the width direction (side), and FIG. 13 illustrates each terminal (when viewed from the front in the overlapping direction). FIG. 6 is an explanatory diagram of each of the power supply terminals 29a to 29c and each of the drive terminals 104A to 104C). In FIG. 12, only the V-phase power supply terminal 29b and the V-phase drive terminal 104B among the power supply terminals 29a to 29c and the drive terminals 104A to 104C (all refer to FIG. 11) are shown for easy understanding. The other power supply terminals 29a and 29c and the drive terminals 104A and 104C (both see FIG. 11) are not shown. Since the relative positional relationship between each of the power supply terminals 29a to 29c and each of the drive terminals 104A to 104C is the same, only the V-phase power supply terminal 29b and the V-phase drive terminal 104B will be described below. Description of 29a, 29c and drive terminals 104A, 104C is omitted.

As shown in FIG. 12, the tip of the drive terminal 104B protrudes from the tip of the power supply terminal 29b. As a result, as shown in FIG. 13, when the power supply terminal 29b and the drive terminal 104B are viewed from the overlapping direction, the drive terminal 104B is exposed on the distal end side of the power supply terminal 29b.
In other words, when the power supply terminal 29b and the drive terminal 104B are viewed from the overlapping direction, the drive terminal 104B is configured to face the rear of the power supply terminal 29b on the tip side of the power supply terminal 29b.
Further, as shown in FIG. 12, a motor drive unit 66 is provided behind the power supply terminal 29b via a predetermined clearance CL1.

On the surface of the drive terminal 104B on the power supply terminal 29b side, a convex portion 108 that protrudes toward the power supply terminal 29b is formed. The convex portion 108 is provided for projection welding the drive terminal 104B and the power supply terminal 29b.
As shown in FIG. 5, the other end portions of the three-phase bus bars 104A to 104C are arranged in parallel with the end portions of the power bus bars 103a and 103b and exposed from the second bus bar opening 54b.

As shown in FIG. 4, the ground terminal 105 is a terminal for securing the ground of the power supply circuit, and at the position corresponding to the flange portion 42 (see FIG. 3) of the motor case 11, the second of the bus bar unit main body 53. The main surface 52 is exposed to the outside through the ground terminal opening 54d. The ground terminal 105 includes an annular fixing portion 105a and an extension portion 105b extending from the negative power terminal bus bar 102b toward the fixing portion 105a. For example, the negative power terminal is made of a metal material such as copper. It is integrally formed with the bus bar 102b. The fixing portion 105a of the ground terminal 105 is fastened and fixed to the flange portion 42 (see FIG. 2) of the motor case 11 by a ground bolt (not shown). Since the ground terminal 105 made of copper is directly fastened and fixed to the flange portion 42, the ground of the power supply circuit can be secured with a small resistance value.

As shown in FIG. 5, the motor drive unit 66 is tapped, for example, in a region corresponding to the disposition opening 41 (see FIG. 3) of the control device disposition portion 40 on the first main surface 51 of the base portion 54. It is attached by screws 66a. The motor drive unit 66 is formed in a substantially rectangular shape in plan view, and includes, for example, a switching element such as an FET (Field effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). Built in.

A plurality of screws 173 (see FIG. 4) for fixing a multilayer substrate 72 (see FIG. 4) to be described later are provided at the four corners on the outer peripheral side of the motor drive unit 66 on the first main surface 51 of the base portion. A plurality of protrusions 56 a to 56 d for receiving the same are provided integrally with the base portion 54. The protrusions 56a and 56b are provided at a position sandwiching the second bus bar opening 54b, and the protrusions 56c and 56d are provided at a position sandwiching the third bus bar opening 54c.

A terminal row 67 is provided on one side surface of the motor drive unit 66 on the first bus bar opening 54a side. Some of the terminals constituting the terminal row 67 are formed in a substantially L shape, and are directed from the first main surface 51 side of the base portion 54 to the second main surface 52 side via the plurality of through holes 54e. The end 67 </ b> A (see FIG. 4) protrudes from the second main surface 52. Of the terminals constituting the terminal row 67, the three three- phase terminals 67a, 67b, and 67c are each formed in a substantially crank shape, and the three-phase bus bars 104a to 104c exposed from the second bus bar openings 54b. It is electrically connected to the other end. Of the terminals constituting the terminal row 67, the two power terminals 67d and 67e are connected to the ends of the power bus bars 103a and 103b that are formed in a substantially crank shape and exposed from the second bus bar opening 54b. Is done.
The motor drive unit 66 converts the DC power input from the power terminals 67d and 67e into three-phase AC and outputs it from the three- phase terminals 67a, 67b and 67c.
On the main surface on the outside of the motor drive unit 66, a heat dissipation sheet 68 made of, for example, silicone rubber is attached.

As shown in FIG. 4, in the second main surface 52 of the base portion 54, a recessed portion 52 a that is recessed by one step is formed in a region corresponding to the opening 41 for placement of the control device placement portion 40 (see FIG. 3). Has been. A motor control unit 71 is disposed at a position corresponding to the recess 52a. The motor control unit 71 is formed by mounting electronic elements (not shown) on a substantially rectangular plate-like multilayer substrate 72 in which wiring is printed on glass epoxy, for example. On the multilayer substrate 72 of the motor control unit 71, the other end portions of the signal system terminal bus bars 101a to 101d erected from the second main surface 52 and a part of the power bus bars 103a and 103b (see FIG. 5) A plurality of through holes 72b through which the end portions 67A of the terminal rows 67 of the motor drive unit 66 are inserted are formed. The multilayer substrate 72 is screwed and fixed to the second main surface 52 (projections 56a to 56d) of the base body 165 with a plurality of screws 173.

As shown in FIG. 2, the connector portion 58 is located on the second main surface 52 of the base portion 54 corresponding to the flange portion 42 of the housing 10 from the second main surface 52 toward the bottom portion 13 of the housing 10. It is erected along the axial direction. As shown in FIG. 4, the connector portion 58 has a substantially rectangular opening, and inside of the end portions of the signal system terminal bus bars 101a to 101d and the power terminal bus bars 102a and 102b (see FIG. 5). One end is arranged. As shown in FIG. 3, the connector portion 58 is led out of the housing 10 through the through hole 43 of the flange portion 42 when the control device 50 is attached to the control device arrangement portion 40.

As shown in FIG. 4, a seal surface 55 is formed around the base end portion of the connector portion 58 on the second main surface 52 side of the base portion 54. The seal surface 55 is formed on a flat surface orthogonal to the central axis O (see FIG. 2). As shown in FIG. 3, a seal member 56 arranged in an annular shape around the connector portion 58 is sandwiched between the seal surface 55 of the base portion 54 and the flange portion 42 of the housing 10. The seal member 56 is an annular O-ring. The seal member 56 is fitted into a ring groove 44 formed so as to surround the through hole 43 of the flange portion 42, and is slightly crushed by the seal surface 55 of the base portion 54. As a result, the sealing member 56 ensures sealing performance around the connector portion 58 and prevents water that has entered from the gap between the connector portion 58 and the through hole 43 of the flange portion 42 from moving outside the sealing member 56. is doing.

As shown in FIG. 5, in the control device 50, pipe-shaped collar members 57a to 57d made of a metal material are insert-molded at the four corners of the base portion. Each of the collar members 57a to 57d includes a cylindrical collar body 57e and a flange portion 57f provided at one end of the collar body 57e in the axial direction. The flange portion 57f is on the second main surface 52 side of the base portion 54. Is provided. As shown in FIG. 3, the control device 50 inserts the bolts 111 into the respective color members 57a to 57d and fastens them to the control device disposing portion 40, whereby the axial opening 12 in the motor case 11 is obtained. It is integrally connected to the side end. Here, due to the flange portions 57f (see FIG. 4) of the respective color members 57a to 57d, the contact area (seat surface area) between the respective color members 57a to 57d and the control device disposing portion 40 is increased, and the fastening force of the both Has come to improve.
Further, among the color members 57a to 57d, a step surface 51a formed between the color members 57c and 57d provided on the motor drive unit 66 side with a step from the surface on which the color members 57c and 57d are disposed. Is formed.

As shown in FIG. 5, a dead space is formed on the first main surface 51 on the opposite side of the connector portion 58 across the base portion 54, and a plurality of noise prevention devices constituting the control device 50 are formed in this portion. An element 80 is provided. Each noise prevention element 80 includes, for example, an X capacitor 87, smoothing capacitors 88 and 88, and a choke coil 81. The X capacitor 87, the smoothing capacitors 88 and 88, and the choke coil 81 are respectively housed in the noise prevention element housing portions 60a to 60d formed in a substantially bathtub shape on the first main surface 51.

The X capacitor 87 is provided mainly for suppressing radio noise. The X capacitor 87 is, for example, a substantially cylindrical electrolytic capacitor, and is provided between the power terminal bus bars 102a and 102b. The X capacitor 87 is arranged such that the center axis thereof is along the longitudinal direction of the base portion 54. A pair of lead portions 87a and 87b extend substantially in parallel from the end surface of the X capacitor 87 on the motor drive unit 66 side. The pair of lead portions 87a and 87b are formed in a substantially crank shape in a side view. The ends of the pair of lead portions 87a and 87b are disposed in the third bus bar opening 54c and connected to the power terminal bus bars 102a and 102b by, for example, projection welding.

The smoothing capacitor 88 is provided to suppress a change in voltage caused by driving the brushless motor 20 (see FIG. 2). As with the X capacitor 87, the smoothing capacitor 88 is, for example, a cylindrical electrolytic capacitor, and a pair of smoothing capacitors 88 are provided between the power bus bars 103a and 103b. As with the X capacitor 87, the smoothing capacitor 88 is arranged so that its central axis is along the longitudinal direction of the base portion 54. A pair of lead portions 88a and 88b extend substantially in parallel from the end surface of the smoothing capacitor 88 on the motor drive unit 66 side. The pair of lead portions 88a and 88b are formed in a substantially crank shape in a side view. The ends of the pair of lead portions 88a and 88b are disposed in the third bus bar opening 54c and connected to the power bus bars 103a and 103b by, for example, projection welding.

The choke coil 81 is provided mainly for suppressing radio noise. The choke coil 81 is formed by winding a conducting wire 83 around a cylindrical core 82 made of a magnetic material such as ferrite, and is provided between the power terminal bus bar 102a and the power bus bar 103a. In the core 82, the motor drive unit 66 side is the winding start side of the conducting wire 83, and the opposite side of the motor drive unit 66 is the winding end side of the conducting wire 83.

The conducting wire 83 of the choke coil 81 extends substantially in parallel toward the motor drive unit 66 such that one end 83a and the other end 83b are along the central axis of the core 82, respectively.
One end portion 83a and the other end portion 83b of the conductive wire 83 are formed in a substantially crank shape in a side view, and are disposed in the third bus bar opening 54c. For example, the power terminal bus bar 102a and the power Connected to bus bar 103a.

As shown in FIG. 3, the cover member 46 is fastened and fixed to, for example, a bolt 112 with respect to the control device arrangement portion 40, and covers the control device arrangement portion 40 and the control device 50 from the outside in the axial direction. Yes.
The cover member 46 is made of a metal material such as iron (carbon steel), aluminum, or copper. In particular, the cover member 46 is preferably formed of aluminum having high thermal conductivity, light weight, and low cost. The cover member 46 is formed in a substantially bathtub shape by a peripheral wall 47 disposed in a rectangular frame around the central axis O corresponding to the control device disposing portion 40 and a bottom wall 48 facing in the axial direction. . Between the peripheral wall 47 of the cover member 46 and the control device disposing portion 40, an O-ring 99 is disposed over the entire circumference in the circumferential direction. The O-ring 99 is fitted into a ring groove 47a (see FIG. 2) formed on the front end surface of the peripheral wall 47 of the cover member 46, and is slightly crushed when the cover member 46 is fastened by the bolt 112, thereby providing a sealing property. Demonstrate. Thereby, the sealing property between the control apparatus arrangement | positioning part 40 and the cover member 46 is ensured.

The bottom wall 48 of the cover member 46 is provided with a breathing hole 45 that communicates the inside and outside of the housing 10. The breathing hole 45 is for releasing the pressure to the outside of the housing 10 when the inside of the housing 10 becomes a pressure higher than the outside of the housing 10 due to, for example, expansion of air accompanying a temperature rise. In addition, the breathing hole 45 is provided at a position facing the step surface 51a of the first main surface 51 of the control device 50 so as to avoid an obstacle that hinders the breathing function, thereby allowing gas to flow into the control device 50. It has come to be smooth.
A plurality of cooling fins 49 are integrally formed on the outer surface of the bottom wall 48 of the cover member 46. The cooling fins 49 radiate heat generated by the control device 50.
Here, as shown in FIG. 2, the motor drive unit 66 attached to the first main surface 51 side of the control device 50 contacts the inner side surface 48 a of the bottom wall 48 of the cover member 46 via the heat radiation sheet 68. It is supposed to be. Thus, the motor drive unit 66 can dissipate heat from the cooling fins 49 of the cover member 46 efficiently by transferring heat to the cover member 46 via the heat dissipation sheet 68.
Further, since the cover member 46 is fastened and fixed to the control device arrangement portion 40 of the housing 10, the heat generated by the control device 50 is radiated through the cooling fins 49 of the cover member 46 and the cover member 46. Compared with the above, the volume is large, and the aluminum housing 10 having a high thermal conductivity is also drawn by heat and diffused, so that the cooling performance of the control device 50 can be further enhanced.

(Welding method between power supply terminal and drive terminal)
Hereinafter, a welding method for each of the power supply terminals 29a to 29c and each of the drive terminals 104A to 104C will be described with reference to FIGS.
FIG. 14 is an explanatory diagram at the time of welding when viewed from the width direction (side), and FIG. 15 is an explanatory diagram at the time of welding when viewed from the overlapping direction. In FIG. 14, only the V-phase power supply terminal 29b and the V-phase drive terminal 104B among the power supply terminals 29a to 29c and the drive terminals 104A to 104C are shown for the sake of clarity. The terminals 29a and 29c and the drive terminals 104A and 104C are not shown. Further, since the welding methods for the power supply terminals 29a to 29c and the corresponding drive terminals 104A to 104C are the same, the following description will be made on the welding method for the V-phase power supply terminal 29b and the V-phase drive terminal 104B. Only the description will be given, and the description of the welding method of the other power supply terminals 29a and 29c and the drive terminals 104A and 104C will be omitted.

As shown in FIG. 14, the power supply terminal 29b and the drive terminal 104B are welded by projection welding. Projection welding between the power supply terminal 29b and the drive terminal 104B is performed using a pair of electrode rods 120 including a main electrode rod 120a and a sub electrode rod 120b, and a restriction jig 122.

The pair of electrode bars 120 is a round bar-shaped general-purpose electrode bar made of an alloy material of copper and tungsten, for example. The main electrode rod 120a is connected to the positive electrode side of a power source (not shown). The front end of the main electrode rod 120a is in contact with the main surface of the power supply terminal 29b from the front in the overlapping direction (left side in FIG. 14) at a position corresponding to the convex portion 108 of the drive terminal 104B. The sub electrode rod 120b is connected to the negative electrode side of a power source (not shown). The front end of the sub-electrode bar 120b is in contact with the main surface of the drive terminal 104B exposed on the front end side of the power supply terminal 29b from the front in the overlapping direction (left side in FIG. 14).

The restriction jig 122 is a rectangular parallelepiped member, and is formed of a metal material such as stainless steel or a resin material, for example. The restriction jig 122 has a dimension along the overlapping direction that is less than the clearance CL <b> 1 between the power supply terminal 29 b and the terminal row 67 of the motor drive unit 66. Accordingly, the restriction jig 122 can be disposed between the drive terminal 104B and the motor drive unit 66 in a state where the front face 122a in the overlapping direction of the restriction jig 122 is in contact with the drive terminal 104B. Further, as shown in FIG. 15, the restriction jig 122 has a width dimension CL2 between the pair of protrusions 56a, 56b positioned on the first bus bar opening 54a (see FIG. 5) side. Is less than
Although not shown in detail, the shape of the front surface 122a of the restricting jig 122 is such that the central portion is offset by the offset of the drive terminal 104B described above when viewed from the axial direction so as to be able to contact the drive terminals 104A to 104C. It is formed in a stepped shape that is a concave shape, and the front surface 122a of the regulating jig 122 is in contact with the drive terminals 104A to 104C simultaneously. Further, protective walls for preventing spatter during welding from being scattered on the motor drive unit 66 and the like are integrally provided at both ends in the width direction of the front surface 122a of the regulating jig 122.

The welding of the power supply terminal 29b and the drive terminal 104B is performed as follows.
As shown in FIG. 14, first, a restriction jig 122 is disposed between the drive terminal 104B and the motor drive unit 66, and the front surface 122a of the restriction jig 122 is in contact with the drive terminal 104B. The restriction jig 122 is fixed by the fixing jig. The restriction jig 122 restricts the rearward movement of the power supply terminal 29b and the drive terminal 104B in the overlapping direction.

Next, the front end of the main electrode rod 120a is brought into contact with the position corresponding to the convex portion 108 of the drive terminal 104B on the main surface of the power supply terminal 29b from the front in the overlapping direction. Further, the front end of the sub electrode rod 120b is brought into contact with the main surface of the drive terminal 104B exposed on the front end side of the power supply terminal 29b from the front in the overlapping direction (left side in FIG. 14). At this time, the step surface 51a formed between the collar members 57c and 57d of the first main surface 51 in the base portion 54 also functions as an escape portion for preventing the main electrode rod 120a from moving forward and backward. Thus, the main electrode rod 120a can be brought into contact with the main surface of the power supply terminal 29b without contacting the base portion 54.

Next, the main electrode rod 120a is pressed from the front to the rear (from left to right in FIG. 14), and the power supply terminal 29b is pressed toward the drive terminal 104B with a predetermined load, while the main electrode rod 120a and A predetermined voltage is applied between the sub electrode rod 120b. As a result, a large current is passed through the power supply terminal 29b and the drive terminal 104B and they are welded together. This completes the projection welding of the power supply terminal 29b and the drive terminal 104B.
Although not shown in detail, the main electrode rod 120a and the sub-electrode rod 120b are provided with the number of welding locations (three sets in this embodiment), and welding between the power supply terminals 29a and 29c and the drive terminals 104A and 104C. The work is similarly performed.

(Effect of the fourth embodiment)
According to this embodiment, in addition to the effects obtained in the first embodiment to the third embodiment, the following effects can be obtained.
That is, according to the present embodiment, when the power supply terminal 29 and the drive terminal 104 are viewed from the overlapping direction of the power supply terminal 29 and the drive terminal 104, the drive terminal 104 can be seen behind the power supply terminal 29. Therefore, when viewed from the overlapping direction, a part of the drive terminal 104 is exposed from the rear of the power supply terminal 29. Accordingly, when the power feeding terminal 29 and the drive terminal 104 are projection welded, the main electrode rod 120a is brought into contact with the power feeding terminal 29 from the front in the overlapping direction, and the sub electrode rod 120b is placed in the same manner as the main electrode rod 120a. It can be brought into contact with the exposed portion of the drive terminal 104 from the front in the overlapping direction. Then, by applying a voltage between the electrode rods 120a and 120b while pressing the main electrode rod 120a from the front to the rear in the overlapping direction, the power supply terminal 29 is pressed against the drive terminal 104 and the power supply terminal 29 Since current is passed between the electrode rods 120a and 120b via the drive terminal 104, the power supply terminal 29 and the drive terminal 104 can be projection welded. Thus, since each electrode rod 120a, 120b can be brought into contact with the power supply terminal 29 and the drive terminal 104 from the same direction and projection welding can be performed, workability when the power supply terminal 29 and the drive terminal 104 are projection welded can be achieved. Can be improved. Moreover, since it can weld using a general-purpose electrode rod, without using a special-shaped electrode rod, a raise of manufacturing cost can be prevented.

In addition, since the clearance CL1 is provided between the rear side of the drive terminal 104 and the motor drive unit 66 that is a component of the control device 50, the movement of the power supply terminal 29 and the drive terminal 104 is regulated behind the drive terminal 104. The restriction jig 122 can be arranged. In addition, since the thickness of the restriction jig 122 can be ensured corresponding to the clearance CL1 between the rear of the drive terminal 104 and the motor drive unit 66, the strength of the restriction jig 122 can be ensured. Accordingly, a sufficient pressure can be secured when the power feeding terminal 29 and the drive terminal 104 are projection welded, so that the power feed terminal 29 and the drive terminal 104 can be firmly projection welded.

Further, when projection welding the power supply terminal 29 and the drive terminal 104, the main electrode rod 120a is brought into contact with the power supply terminal 29 from the front in the overlap direction, and the sub electrode rod 120b is moved from the front in the overlap direction to the tip side. Can be brought into contact with the exposed portion of the drive terminal 104.

Further, since the electric motor 70 that can improve the workability at the time of projection welding is provided, the low-cost electric pump 1 can be formed.

(Modification of the fourth embodiment)
FIG. 16 is an explanatory diagram of each terminal (each power supply terminal 29a to 29c and each drive terminal 104A to 104C) according to a modification of the fourth embodiment when viewed from the overlapping direction. In FIG. 16, the V-phase power supply terminal 29b and the V-phase drive terminal 104B are welded using a pair of electrode rods 120 (main electrode rod 120a and sub-electrode rod 120b) and a regulating jig 123. The case is illustrated.

Next, each terminal and welding method according to a modification of the fourth embodiment will be described.
In the fourth embodiment, when the power supply terminals 29 (29a to 29c) and the drive terminals 104 (104A to 104C) are viewed from the overlapping direction, the drive terminals 104 are configured to face the front end side of the power supply terminals 29. (See FIG. 15).
On the other hand, in the modification of the fourth embodiment, as shown in FIG. 16, when the power supply terminals 29 (29a to 29c) and the drive terminals 104 (104A to 104C) are viewed from the overlapping direction, the power supply in the width direction is performed. The fourth embodiment is different from the fourth embodiment in that the drive terminal 104 can be exposed outside the terminal 29. Note that detailed description of the same components as in the fourth embodiment is omitted, and only different portions are described.

The driving terminals 104A to 104C each have a bent end. Accordingly, when the power supply terminals 29a to 29c and the drive terminals 104A to 104C are viewed from the overlapping direction, the drive terminals 104A to 104C are respectively outside in the width direction of the corresponding power supply terminals 29a to 29c (right side in FIG. 16). Is exposed.

The front end of the main electrode rod 120a is the main surface of the power supply terminal 29 (29b in FIG. 16) from the front in the overlapping direction, and is at a position corresponding to the convex portion 108 of the drive terminal 104 (104B in FIG. 16). Abutted. The tip of the sub-electrode rod 120b comes into contact with the main surface of the drive terminal 104B exposed outside the power supply terminal 29b from the front in the overlapping direction. At this time, the step surface 51a formed between the collar members 57c and 57d of the first main surface 51 in the base portion 54 can be used as an escape portion for preventing the main electrode rod 120a and the auxiliary electrode rod 120b from moving forward and backward. Thus, the main electrode rod 120a and the sub electrode rod 120b can be brought into contact with the main surface of the power supply terminal 29b and the drive terminal 104B without contacting the base portion 54.

The restriction jig 123 in this modification is arranged between the drive terminal 104B and the motor drive unit 66 with the front surface 123a in the overlapping direction being in contact with the drive terminal 104B. Further, the dimension along the width direction of the regulating jig 123 is equal to or less than the width dimension CL2 between the pair of protrusions 56a and 56b located on the first bus bar opening 54a (see FIG. 5) side, and the driving terminal 104A and The distance from the drive terminal 104C is less than CL3. Accordingly, when the restriction jig 123 is disposed between the drive terminal 104B and the motor drive unit 66, it is possible to prevent the drive terminal 104A and the drive terminal 104C from interfering with the restriction jig 123.
Further, only one set of the main electrode rod 120a and the sub electrode rod 120b is provided, and welding work between the power supply terminals 29a and 29c and the drive terminals 104A and 104C is performed in a predetermined order.

(Effects of Modification of Fourth Embodiment)
According to the modification of the fourth embodiment, when the power feeding terminal 29 and the drive terminal 104 are projection welded, the main electrode rod 120a is brought into contact with the power feeding terminal 29 from the front in the overlapping direction, and the sub electrode rod 120b is attached. It can be brought into contact with the exposed portion of the drive terminal 104 on the outer side in the width direction from the front in the overlapping direction.
In addition, the restriction jig 123 can be made smaller, the shape can be simplified, and the number of electrode bars 120 can be reduced.

As described above, the embodiments of the present invention have been described with reference to FIGS. However, the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The materials, shapes, and the like of the housing 10, the brushless motor 20, the control device 50, the noise prevention element 80, the pump unit 90, the bus bar 100, and the like are not limited to the embodiments. For example, the bus bar 100 may be formed of aluminum. Moreover, you may form the housing 10 with metal materials, such as iron (carbon steel).

In the pump unit 90 of the first embodiment, the suction port 16 and the discharge port 17 are formed inside the bottom portion 13 of the motor case 11, but the suction port 16 and the discharge port 17 are not provided on the motor case 11 side. Alternatively, it may be provided on the pump unit 90 side. Specifically, the suction port 16 and the discharge port 17 may be formed in the pump cover 94 that covers the pump case 91.

Moreover, although the pump part 90 of 1st embodiment was what is called a trochoid pump, the system of a pump is not limited to 1st embodiment. For example, a non-volume regenerative pump having an impeller may be used.

In each embodiment, the connector portion 58 is erected along the axial direction and led out of the housing 10. On the other hand, the connector part 58 may be erected along the radial direction and led out of the housing 10. However, each embodiment has an advantage in that the connector portion 58 can be disposed by effectively utilizing the dead space while suppressing the electric motor 70 from being enlarged in the radial direction.

In each embodiment, an O-ring is adopted as the seal member 56 provided around the connector portion 58, but the seal member 56 is not limited to the O-ring. For example, the seal member 56 may be a sheet-like rubber member or a liquid packing.

In the fourth embodiment and the modification of the fourth embodiment, the power supply terminal 29 and the drive terminal 104 are welded by projection welding, but the welding method is not limited to projection welding. For example, the present invention can be applied to any welding method such as spot welding or seam welding performed by pressurizing an electrode rod to a terminal. In addition, when the power supply terminal 29 and the drive terminal 104 are viewed from the overlapping direction, the drive terminal 104 faces the rear of the power supply terminal 29, but the power supply terminal 29 faces the rear of the drive terminal 104. It may be configured as follows.

In the fourth embodiment and the modified example of the fourth embodiment, of the drive terminals 104A to 104C, the drive terminal 104B can be electrically connected to the power supply terminal 29b, and the motor drive unit 66 is connected to the drive terminals 104A and 104C. However, the drive terminals 104B may be provided side by side without being offset.

The materials, shapes, and the like of the housing 10, the brushless motor 20, the control device 50, the anti-noise element 80, the pump unit 90, the bus bar 100, and the like are not limited to the embodiment. For example, the bus bar 100 may be formed of aluminum. Moreover, you may form the housing 10 with metal materials, such as iron (carbon steel).

The pump unit 90 of the fourth embodiment is a so-called trochoid pump, but the pump system is not limited to the embodiment. For example, a non-volume regenerative pump having an impeller may be used.

In the fourth embodiment, the connector portion 58 is erected along the axial direction and led out to the bottom portion 13 side of the housing 10, but may be led out to the side opposite to the bottom portion 13 of the housing 10.

Further, the case where the suction port 16 and the discharge port 17 are formed inside the bottom portion 13 of the motor case 11 has been described. However, the suction port 16 and the discharge port 17 may be provided on the pump unit 90 side without being provided on the motor case 11 side.
Specifically, the suction port 16 and the discharge port 17 may be formed in the pump cover 94 that covers the pump case 91.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the spirit of the present invention.

According to the electric motor described above, the motor drive unit is attached to one side surface of the base portion, and the motor control unit is attached to the other side surface of the base portion. The area of the one side surface and the other side surface of the base portion can be reduced compared to the case where only the motor drive unit and the motor control unit are attached, and the outer shape of the base portion can be reduced in size. In addition, since a plurality of bus bars are wired inside the base portion, the base portion has a base portion that is more wired than the case where the bus bars are wired while bypassing the motor drive unit and the motor control unit on one side surface and the other side surface of the base portion. The outer shape can be reduced and the base can be made thinner. Therefore, the electric motor can be downsized in the axial direction and the radial direction.

Further, according to the above-described electric motor, the connector part is led out through the through hole of the housing, and the seal member arranged in an annular shape around the connector part is sandwiched between the seal surface and the housing. It is possible to prevent water that has entered from the gap between the connector portion and the through hole from moving outside the seal member. Therefore, it is possible to prevent water from entering from the connector portion into the housing, and to ensure the waterproofness of the electric motor.

Furthermore, according to the above-described electric motor, when the power supply terminal and the drive terminal are viewed from the overlapping direction of the power supply terminal and the drive terminal, the other terminal can face the rear of one of the power supply terminal and the drive terminal. Therefore, when viewed from the overlapping direction, a part of the other terminal is exposed from the rear of one terminal. Thereby, when resistance welding the power feeding terminal and the drive terminal, the first electrode rod is brought into contact with one terminal from the front in the overlapping direction, and the second electrode rod is made the same as the first electrode rod. The exposed portion of the other terminal can be contacted from the front in the overlapping direction. Then, by applying a voltage between both electrode rods while pressing the first electrode rod from the front to the rear in the overlapping direction, one terminal is pressed by the other terminal and both terminals are interposed via both terminals. Since current is passed between the electrode rods, both terminals can be resistance welded. Thus, since each electrode rod can be brought into contact with each terminal from the same direction and both terminals can be resistance-welded, workability when both terminals are resistance-welded can be improved. Moreover, since it can weld using a general-purpose electrode rod, without using a special-shaped electrode rod, a raise of manufacturing cost can be prevented.

DESCRIPTION OF SYMBOLS 1 Electric pump 10 Housing 11 Motor case 20 Brushless motor (motor part)
DESCRIPTION OF SYMBOLS 21 Stator 29, 29a, 29b, 29c Feeding terminal 31 Rotor 40 Control apparatus arrangement | positioning part 42 Flange part 43 Through-hole 46 Cover member 46a Through-hole 50 Control apparatus 51 1st main surface (one side)
52 Second main surface (the other side)
53 Busbar unit main body 54 Base part 55 Seal surface 56 Seal member 57a, 57b Collar member (fixing means)
58 Connector 66 Motor drive unit (component)
70 Electric Motor 71 Motor Control Unit 80 Anti-Miscellaneous Element 81 Choke Coil (Miscellaneous Element)
87 X capacitor (miscellaneous element)
88 Smoothing capacitor (noise prevention element)
90 Pump unit 100 Bus bar 104, 104A, 104B, 104C Drive terminal 111 Bolt (fixing means)
CL1 clearance

Claims (10)

1. A motor unit including a stator provided inside a motor case constituting a part of the housing, and a rotor rotatably supported inside the stator in the radial direction;
   A control unit integrally connected to an axial end of the motor case;
   An electric motor comprising:
   The control device includes:
   A bus bar unit main body having a base portion in which a plurality of bus bars are wired, and a connector portion provided integrally with the base portion;
   A motor drive unit for driving the motor unit;
   A motor control unit for controlling the motor drive unit;
   With
   An electric motor in which the motor drive unit is attached to one side surface in the axial direction of the base portion, and the motor control unit is attached to the other side surface in the axial direction of the base portion.
2. The electric motor according to claim 1,
   The housing is provided with a through hole at a position corresponding to the connector portion,
   The connector portion is integrally provided on one of the one side surface and the other side surface of the base portion, is erected along the axial direction, and is led out of the housing through the through hole. motor.
3. The electric motor according to claim 2,
   A sealing surface is formed around the base end portion of the connector portion in the base portion,
   The connector portion is led out of the housing through the through hole,
   An electric motor in which a seal member disposed in an annular shape around the connector portion is sandwiched between the seal surface and the housing.
4. The electric motor according to claim 3,
   A fixing means for fixing the bus bar unit main body to the housing is provided outside the seal member in the base portion,
   The fixing means is an electric motor that is evenly arranged around the connector portion.
5. The electric motor according to claim 2,
   An electric motor in which a noise prevention element constituting the control device is provided on a surface opposite to the connector portion with the base portion interposed therebetween.
6. The electric motor according to claim 2 or 5,
   At one end of the motor case in the axial direction, a control device disposition unit for attaching the control device is provided,
   Comprising a cover member that forms part of the housing and covers the control device disposition portion from one side in the axial direction;
   The control device disposition portion is provided with a flange portion that projects outward in the radial direction,
   The connector portion is erected along the axial direction from the other side surface in the axial direction of the base portion,
   In the flange portion, the through hole is formed,
   The connector portion is an electric motor led out of the housing through the through hole.
7. The electric motor according to claim 2 or 5,
   At one end of the motor case in the axial direction, a control device disposition unit for attaching the control device is provided,
   Comprising a cover member that forms part of the housing and covers the control device disposition portion from one side in the axial direction;
   The connector portion is erected along the axial direction from one axial side surface of the base portion,
   The cover member is formed with the through hole,
   The connector portion is an electric motor led out of the housing through the through hole.
8. The electric motor according to claim 6 or 7,
   The cover member is formed of a metal material,
   The motor drive unit is an electric motor connected to the cover member.
9. The electric motor according to any one of claims 1 to 8,
   An electric pump is formed by integrally connecting a pump portion to the other axial end of the motor case,
   An electric motor which is a drive source of the electric pump.
10. A motor unit including a stator provided inside a motor case constituting a part of the housing, and a rotor rotatably supported inside the stator in the radial direction;
    A control unit integrally connected to an axial end of the motor case;
    A pump unit integrally connected to the other end of the motor case in the axial direction;
    An electric pump comprising:
    The control device includes:
    A bus bar unit main body having a base portion in which a plurality of bus bars are wired, and a connector portion provided integrally with the base portion;
    A motor drive unit for driving the motor unit;
    A motor control unit for controlling the motor drive unit;
    With
    The motor drive unit is attached to one side surface of the base portion in the axial direction, and the motor control unit is attached to the other side surface of the base portion in the axial direction.

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