CN213425978U

CN213425978U - Motor and pump device

Info

Publication number: CN213425978U
Application number: CN201990000623.5U
Authority: CN
Inventors: 姜郑旺; 樋口孔二; 梶田国博
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Tosok Corp
Priority date: 2018-04-13
Filing date: 2019-03-27
Publication date: 2021-06-11
Anticipated expiration: 2029-03-27
Also published as: JPWO2019198517A1; WO2019198517A1

Abstract

The utility model provides a motor and pump unit, this motor has: a rotor having a shaft that rotates about a center axis; a stator facing the rotor with a gap in a radial direction; a circuit board located on one side of the stator in the axial direction, and having a board surface facing the axial direction; an electronic component mounted on one axial surface of the circuit board and electrically connected to the stator; and a housing that houses the rotor, the stator, the circuit board, and the electronic component. The housing has a cover having a cover main body portion covering one axial side of the circuit board. The cover main body portion has: a base portion that covers one axial side of a portion of the circuit board other than a portion on which the electronic component is mounted; and a housing portion that protrudes to one axial side from the base portion and covers one axial side of the electronic component. At least a part of the electronic component is accommodated in the accommodating portion.

Description

Motor and pump device

Technical Field

The utility model relates to a motor and pump unit.

Background

Motors having a circuit board mounted with electronic components electrically connected to a stator are known. For example, patent document 1 describes a motor having a control board on which an inverter circuit is mounted.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-064356

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

In the motor as described above, if the output of the motor is increased, the electronic components may become larger. Therefore, the size of the housing for housing the electronic components may be increased, which may lead to an increase in the size of the entire motor.

In view of the above problems, an object of the present invention is to provide a motor having a structure capable of suppressing an increase in the output of the motor even if the output of the motor is increased, and a pump device having the motor.

Means for solving the problems

The utility model discloses a mode is the motor, its characterized in that, this motor has: a rotor having a shaft that rotates about a center axis; a stator that is opposed to the rotor with a gap therebetween in a radial direction; a circuit board located on one axial side of the stator, and having a board surface facing the axial direction; an electronic component mounted on one axial surface of the circuit board and electrically connected to the stator; and a housing that houses the rotor, the stator, the circuit board, and the electronic component. The housing has a cover having a cover main body portion covering one axial side of the circuit board. The cover main body portion includes: a base portion that covers one axial side of a portion of the circuit board other than a portion on which the electronic component is mounted; and a housing portion that protrudes to one axial side from the base portion and covers one axial side of the electronic component. At least a part of the electronic component is housed inside the housing portion.

Preferably, the motor further includes an inverter mounted on the circuit board and electrically connected to the stator, and the electronic component is a capacitor electrically connected to the inverter.

Preferably, the motor further includes a heat dissipation member provided on the circuit board, the inverter is attached to the other axial surface of the circuit board, and a portion of the heat dissipation member that overlaps the inverter when viewed in the axial direction of the one axial surface of the circuit board and a portion of the heat dissipation member that overlaps the inverter when viewed in the axial direction of the circuit board are in contact with the other axial surface of the base.

Preferably, the cover has a plurality of fins on an axial one-side surface of the base.

Preferably, the plurality of fins includes a fin extending in a direction perpendicular to the axial direction and connected to the housing portion.

Preferably, one axial end of each of the plurality of fins is located at the same position in the axial direction as one axial end of the housing.

The utility model discloses a mode is pump unit, its characterized in that, this pump unit has: the above-mentioned motor; and a pump section driven by the motor.

Preferably, the housing has a case fixed to an attached body, and the attached body has: a recess recessed from one axial side of the mounted body toward the other axial side; and a hole portion that is recessed from a portion of a surface on one axial side of the body to be attached, the portion being located radially outward of the recess portion, to the other axial side, the housing including: a case body portion that houses the pump portion and is housed in the recess; a flange portion that protrudes radially outward from an end portion on one side in the axial direction of the housing main body portion; and a pin portion that protrudes from the other axial surface of the flange portion, the flange portion being fixed to the one axial surface of the body to be attached, the pin portion being fitted in the hole portion.

Effect of the utility model

According to an aspect of the present invention, even if the output of the motor is increased, the motor can be prevented from being increased in size.

Drawings

Fig. 1 is a perspective view showing a pump device of the present embodiment.

Fig. 2 is a view of the pump device of the present embodiment as viewed from above.

Fig. 3 is a diagram showing the pump device of the present embodiment, and is a diagram partially showing a section III-III in fig. 2.

Fig. 4 is a view showing a part of the pump device of the present embodiment, and is a sectional view IV-IV in fig. 2.

Detailed Description

In each figure, the Z-axis direction is a vertical direction in which the positive side is an upper side and the negative side is a lower side. The axial direction of the central axis J, which is an imaginary axis appropriately shown in each drawing, is parallel to the Z-axis direction, i.e., the vertical direction. The X-axis direction is a direction perpendicular to the Z-axis direction. The Y-axis direction is a direction perpendicular to both the Z-axis direction and the X-axis direction. In the following description, a direction parallel to the axial direction of the central axis J is simply referred to as "axial direction Z", a direction parallel to the X-axis direction is referred to as "width direction X", and a direction parallel to the Y-axis direction is referred to as "projecting direction Y". The positive side in the X-axis direction is referred to as "one side in the width direction", and the negative side in the X-axis direction is referred to as "the other side in the width direction". Unless otherwise specified, a radial direction about the central axis J is simply referred to as a "radial direction", and a circumferential direction about the central axis J is simply referred to as a "circumferential direction".

In the present embodiment, the upper side corresponds to one axial side, and the lower side corresponds to the other axial side. The upper side and the lower side are only names for describing the relative positional relationship of the respective parts, and the actual arrangement relationship may be an arrangement relationship other than the arrangement relationship indicated by the names.

The pump device 10 of the present embodiment shown in fig. 1 to 4 is, for example, an electric oil pump that transports oil. As shown in fig. 3, the pump device 10 is attached to the attached body B. The mounted body B is, for example, a housing of a driving unit in a vehicle. The mounted body B has a recess Ba, an inlet Bb, an outlet not shown, a groove Bc, and a hole Bd. The recess Ba is recessed from the upper surface of the mounted body B toward the lower surface. Although not shown, the inner surface of the recess Ba has a circular shape centered on the central axis J when viewed in the axial direction Z. The inlet Bb is open at the bottom surface of the recess Ba. The inlet Bb is located at a position radially offset from the central axis J. Although not shown, the outlet is opened to the inner surface of the recess Ba at a position different from the inlet Bb. The pump device 10 sucks oil from the inlet Bb by the pump section 12 described later and discharges the oil from the outlet.

The groove Bc is recessed downward from a portion of the upper surface of the mounted body B radially outward of the recess Ba. Although not shown, the groove Bc is annular to surround the recess Ba when viewed in the axial direction Z. An annular O-ring Be is fitted into the groove Bc.

The hole Bd is recessed downward from a portion of the upper surface of the mounted body B radially outward of the recess Ba. In the present embodiment, the hole Bd is recessed downward from a portion radially outward of the groove Bc in the upper surface of the mounted body B. In the present embodiment, for example, two holes Bd are provided. The two holes Bd are located on opposite sides of the central axis J in the radial direction.

The pump device 10 includes a motor 11 and a pump section 12 driven by the motor 11. The pump section 12 includes an inner rotor 12a, an outer rotor 12b located radially outward of the inner rotor 12a, and a pump chamber 12c that houses the inner rotor 12a and the outer rotor 12 b. The inner rotor 12a and the outer rotor 12b are pump gears, and mesh with each other.

The motor 11 rotates the inner rotor 12a to drive the pump section 12. As shown in fig. 3 and 4, the motor 11 includes a rotor 13, a stator 14, a housing 20, a bus bar holder 30, a bus bar 70, a breather 50, a circuit board 60, an inverter 61, a capacitor 62, and a cover 40.

As shown in fig. 1, in the present embodiment, the housing 20, a bus bar holder main body portion 31, which will be described later, of the bus bar holder 30, and a cover 40 constitute the outer case 15. That is, the motor 11 has a housing 15, and the housing 15 has a case 20, a bus bar holder body portion 31, and a cover 40. As shown in fig. 3, the housing 15 houses the rotor 13, the stator 14, the circuit board 60, the inverter 61, and the capacitor 62.

The rotor 13 has a shaft 13a and a rotor body 13 b. The shaft 13a rotates about the center axis J. In the present embodiment, the shaft 13a has a cylindrical shape extending in the axial direction Z about the central axis J. An inner rotor 12a is fixed to a lower end of the shaft 13 a. The rotor body 13b is fixed to the outer peripheral surface of the shaft 13 a. Although not shown, the rotor body 13b includes a rotor core and a rotor magnet.

The stator 14 and the rotor 13 are opposed to each other with a gap in the radial direction. The stator 14 is located radially outside the rotor 13. Although not shown, the stator 14 includes a stator core and a plurality of coils mounted on the stator core.

The housing 20 is fixed to the body B to be mounted. The housing 20 includes a housing main body 21, a flange 22, and a pump cover 23. As shown in fig. 1 and 3, the housing body 21 has a tubular shape extending in the axial direction Z. More specifically, the housing body 21 is cylindrical about the central axis J, and is open on both axial sides. As shown in fig. 3, the casing body 21 houses the rotor 13, the stator 14, and the pump unit 12. The case body 21 is accommodated in the recess Ba.

The flange portion 22 protrudes radially outward from the upper end of the housing body 21. The flange 22 is fixed to the upper surface of the body B. The lower surface of the flange 22 contacts the upper surface of the body B. The flange portion 22 has a flange main body 22a and a mounting portion 22 b. As shown in fig. 1, the flange main body 22a has a substantially annular shape centered on the central axis J. As shown in fig. 3, the lower surface of the flange main body 22a closes the upper opening of the groove Bc. The O-ring Be contacts the lower surface of the flange main body 22 a. Thus, the O-ring Be seals between the lower surface of the flange portion 22 and the upper surface of the attached body B.

The mounting portion 22b projects radially outward from the flange main body 22 a. As shown in fig. 2, in the present embodiment, three mounting portions 22b are provided in the circumferential direction. Each mounting portion 22B is fixed to the upper surface of the body B by a screw. In the present embodiment, the case body portion 21 and the flange portion 22 are part of the same single member.

As shown in fig. 3, the pump cover portion 23 is fixed to the lower end of the housing main body portion 21 by screws. The pump cover portion 23 has a pump cover portion main body 23a and a protruding portion 23 b. The pump cover portion main body 23a has a circular plate shape centered on the central axis J. The pump cover portion main body 23a closes the opening on the lower side of the housing main body 21. The protruding portion 23b protrudes downward from the pump cover portion main body 23 a. The protruding portion 23b is cylindrical and open on both sides in the axial direction. The protruding portion 23b is located at a position radially offset from the central axis J.

The projection 23b is inserted into the inlet Bb. The oil is sucked into the pump section 12 from the inlet Bb through the inside of the protruding portion 23 b. An annular O-ring 23c is attached to the outer peripheral surface of the projection 23 b. The O-ring 23c seals between the outer peripheral surface of the protrusion 23b and the inner peripheral surface of the inlet Bb.

The housing 20 also has a pin portion 24. The pin portion 24 protrudes downward from the lower surface of the flange portion 22. In the present embodiment, the pin portion 24 has, for example, a cylindrical shape. In the present embodiment, for example, two pin portions 24 are provided. The two pin portions 24 are located on opposite sides from each other in the radial direction with the center axis J interposed therebetween. The pin portions 24 are fitted in the holes Bd, respectively. This enables the housing 20 to be positioned with high accuracy in the circumferential direction and the radial direction with respect to the body B to be mounted. Therefore, the case main body portion 21 can be suppressed from moving in the circumferential direction and the radial direction within the recess Ba, and the protruding portion 23b can be suppressed from moving in the circumferential direction and the radial direction within the inlet Bb.

The bus bar holder 30 is fixed to the upper side of the case 20. As shown in fig. 4, the bus bar holder 30 holds the bus bar 70. In the present embodiment, the bus bar holder 30 is made of resin. The bus bar holder 30 is manufactured by insert molding in which the bus bar 70 is an insert member, for example. The bus bar holder 30 has a bus bar holder main body portion 31 and a connector portion 32. That is, the motor 11 includes the bus bar holder main body portion 31 and the connector portion 32.

The busbar holder body 31 has a bottom portion 31a, an annular portion 31b, and a support portion 31 c. That is, the bus bar holder 30 has a bottom portion 31a, an annular portion 31b, and a support portion 31 c. The bottom portion 31a has a substantially circular plate shape expanding in the radial direction. Although not shown, the radially outer edge portion of the bottom portion 31a contacts the upper surface of the flange main body 22a via a gasket. The annular portion 31b is annular and projects upward from the radially outer edge of the bottom portion 31 a. The annular portion 31b surrounds the central axis J. The radially outer surface of the annular portion 31b is a part of the radially outer surface of the housing 15. That is, the annular portion 31b constitutes a part of the radially outer surface of the housing 15. The support portion 31c protrudes upward from the bottom portion 31a radially inward of the annular portion 31 b. Although not shown, for example, a plurality of support portions 31c are provided.

An external power supply for supplying electric power to the stator 14, for example, is connected to the connector portion 32. The connector portion 32 is provided on the radially outer surface of the annular portion 31 b. That is, the connector portion 32 is provided on the housing 15. As shown in fig. 2, in the present embodiment, the connector portion 32 is located on the other side in the width direction than the center axis J. As shown in fig. 4, the connector portion 32 has a projecting direction extending portion 32a, an axial direction extending portion 32b, and a terminal fixing portion 32 g. The projecting-direction extending portion 32a extends from the annular portion 31b in a projecting direction Y perpendicular to the axial direction Z. That is, the projecting-direction extending portion 32a extends from the housing 15 in the projecting direction Y.

In the following description, in the relative positional relationship between the bus bar holder main body portion 31 and the connector portion 32 in the projecting direction Y, the connector portion 32 side, i.e., the positive side in the Y-axis direction, is referred to as "projecting direction outer side", and the bus bar holder main body portion 31 side, i.e., the negative side in the Y-axis direction, is referred to as "projecting direction inner side".

The axial extension 32b extends in the axial direction Z. In the present embodiment, the axially extending portion 32b extends upward from the distal end portion of the projecting-direction extending portion 32a, i.e., the end portion on the outer side in the projecting direction. The axial extension 32b has a connecting recess 32 c. The coupling recess 32c is recessed downward from the end of the upper side of the axial extension 32 b. A terminal of an external power supply is inserted into the connection recess 32 c.

The terminal fixing portion 32g is provided on a side surface of the axially extending portion 32 b. More specifically, the terminal fixing portion 32g is provided on the surface on the outer side in the protruding direction of the axially extending portion 32 b. As shown in fig. 1 and 4, the terminal fixing portion 32g has a square tube shape having an opening 32i opened at the upper side. As shown in fig. 4, the terminal fixing portion 32g has a claw portion 32h protruding from the outer side in the protruding direction of the inner side surface of the opening portion 32i toward the inner side in the protruding direction. A fixing claw portion provided on a terminal of an external power supply, not shown, is inserted into the terminal fixing portion 32 g. The fixing claw portion is hooked to the claw portion 32h from the lower side by snap-fitting. This suppresses the terminal of the external power supply from falling off the connector portion 32, and the terminal of the external power supply is fixed to the connector portion 32.

The connector portion 32 further includes a coupling hole portion 32d, a 1 st hole portion 32e, and a 2 nd hole portion 32 f. The coupling hole portion 32d is recessed downward from the bottom surface of the coupling recess portion 32 c. The coupling hole portion 32d is a hole having a bottom. When viewed in the projecting direction Y, the lower end of the coupling hole 32d overlaps the projecting-direction extending portion 32 a. The 1 st hole 32e opens on the outer surface of the connector portion 32. The 1 st hole 32e penetrates the coupling hole 32d from the surface on the outer side in the protruding direction of the lower end of the axially extending portion 32b in the protruding direction Y. The inner diameter of the 1 st hole portion 32e becomes smaller toward the projecting direction inner side. The inner peripheral surface of the 1 st hole portion 32e is a tapered surface.

The 2 nd hole 32f is recessed inward in the protruding direction from the inner surface of the coupling hole 32d, and extends to the radially inner surface of the annular portion 31b in the protruding direction Y through the inside of the protruding direction extending portion 32 a. Thereby, the 2 nd hole 32f is connected to the 1 st hole 32e via the connection hole 32d, and extends into the housing 15.

In the present embodiment, the bus bar 70 is held so as to be partially embedded in the bus bar holder 30. The bus bar 70 is an elongated plate-like member. The bus bar 70 is provided in plurality, for example. The bus bar 70 has a terminal portion 71, and the terminal portion 71 is exposed to the outside of the housing 15 through the connector portion 32. The terminal portion 71 protrudes upward from the bottom surface of the connection recess portion 32c, and is exposed to the outside of the housing 15 through the inside of the connection recess portion 32 c. The terminal portion 71 is an end portion on one side of the bus bar 70. The bus bar 70 is electrically connected to an external power supply connected to the connector portion 32 via a terminal portion 71. Although not shown, the other end of the bus bar 70 is exposed inside the housing 15 and connected to the circuit board 60.

The vent 50 is disposed on the connector portion 32. In more detail, the breather 50 is provided at the side of the axially extending portion 32 b. In the present embodiment, the breather 50 is provided on the surface on the outer side in the protruding direction of the lower end portion of the axially extending portion 32 b. The breather 50 overlaps the projecting-direction extending portion 32a as viewed in the projecting direction Y. The breather 50 is located below the terminal fixing portion 32 g. The breather 50 has a cylindrical portion 51 and a large-diameter portion 52.

The cylindrical portion 51 is cylindrical and extends in the projecting direction Y and is open on both sides in the projecting direction. The cylindrical portion 51 opens into the 1 st hole portion 32 e. The cylindrical portion 51 has a main body portion 51a and a protruding claw portion 51 b. The main body 51a is a portion passing through the 1 st hole 32 e. The end portion of the body portion 51a on the inner side in the protruding direction is inserted into the coupling hole portion 32 d. The protruding claw portion 51b protrudes outward from the end portion of the main body portion 51a on the inner side in the protruding direction in the radial direction of the cylindrical portion 51. The protruding claw portion 51b is hooked on the inner surface of the coupling hole portion 32d from the inside in the protruding direction by snap-fitting. This can prevent the cylindrical portion 51 from coming out of the 1 st hole portion 32e, and can prevent the ventilator 50 from coming off the connector portion 32.

The large diameter portion 52 is connected to an end portion of the cylindrical portion 51 on the outer side in the protruding direction. The large-diameter portion 52 has an outer diameter larger than that of the cylindrical portion 51. The large diameter portion 52 is located outside the housing 15. The large diameter portion 52 is a hollow portion. The inside of the large-diameter portion 52 is connected to the inside of the cylindrical portion 51. As shown in fig. 1, the large diameter portion 52 has a circular shape when viewed in the projecting direction Y. As shown in fig. 4, the large diameter portion 52 includes a bottom wall portion 52a, a peripheral wall portion 52b, and a top wall portion 52 c.

The bottom wall portion 52a has an annular plate shape extending outward from an end portion on the outer side in the protruding direction of the cylindrical portion 51 in the radial direction of the cylindrical portion 51. The bottom wall portion 52a has a breathing hole 52e penetrating the bottom wall portion 52a in the projecting direction Y. Namely, the ventilator 50 has a breathing hole 52 e. Although not shown, a plurality of breathing holes 52e are provided in the circumferential direction.

The peripheral wall portion 52b is an annular wall portion that protrudes outward in the protruding direction from the outer peripheral edge portion of the bottom wall portion 52 a. The peripheral wall portion 52b has a breathing hole 52d penetrating the peripheral wall portion 52b in the radial direction of the cylindrical portion 51. Namely, the ventilator 50 has a breathing hole 52 d. Although not shown, the breathing hole 52d extends in the circumferential direction around the center axis of the cylindrical portion 51. Although not shown, the plurality of breathing holes 52d are provided along the circumferential direction around the center axis of the cylindrical portion 51. The top wall portion 52c is continuous with an end portion of the peripheral wall portion 52b on the outer side in the protruding direction.

The top wall portion 52c has a disc shape with a plate surface facing the projecting direction Y. The end surface on the outer side in the protruding direction of the top wall portion 52c is the end portion on the outer side in the protruding direction of the breather device 50. The end surface of the top wall portion 52c on the outer side in the protruding direction is positioned slightly inward in the protruding direction from the end portion of the terminal fixing portion 32g on the outer side in the protruding direction.

The breathing holes 52d, 52e connect the inside and outside of the housing 15. In the present embodiment, the

breathing holes

52d, 52e are provided in the large diameter portion 52, and the inside and the outside of the housing 15 are connected via the 2 nd hole portion 32f, the coupling hole portion 32d, the inside of the cylindrical portion 51, and the inside of the large diameter portion 52. Since the ventilator 50 having the breathing holes 52d and 52e is provided, the air inside the housing 15 can be discharged to the outside through the breathing holes 52d and 52 e.

Further, for example, when the ventilation device is provided in the bus bar holder main body portion, it is easy to increase the size of the bus bar holder main body portion in the axial direction Z to provide the 1 st hole portion. Therefore, the motor as a whole is easily increased in size. In contrast, according to the present embodiment, since the breather device 50 is provided in the connector portion 32, the bus bar holder main body portion 31 can be prevented from being enlarged in the axial direction Z, and the entire motor 11 can be prevented from being enlarged in the axial direction Z. Further, since the connector portion 32 has the axially extending portion 32b, it is easy to downsize the connector portion 32 in the projecting direction Y, compared with a case where the entire portion extends in the projecting direction Y. This makes it possible to reduce the size of the entire motor 11 in the projecting direction Y. Therefore, the motor 11 having the breather device 50 can be prevented from being enlarged. In addition, the pump device 10 having the motor 11 can be prevented from being large.

Even when the shape of the ventilation device 50 is changed, it is only necessary to change the shape of the connector portion 32 to which the ventilation device 50 is attached, and it is not necessary to change the shape of the housing 15 such as the bus bar holder main body portion 31. Therefore, when the shape or the like of the breather device 50 is changed, the design of the pump device 10 can be easily changed.

In addition, for example, in the case where the cover is made by press working a plate member, the thickness of the cover becomes thin. Therefore, it may be difficult to attach the ventilator having the shape like the ventilator 50 described above simply by providing the hole in the cover. In this way, when the cover has a structure in which the ventilator can be attached, there is a possibility that the range of selection of the shape and the manufacturing method of the cover becomes narrow. In contrast, according to the present embodiment, since the breather 50 is provided in the connector portion 32, the shape and the manufacturing method of the cover 40 are not limited by the breather 50, and the range of selection of the shape and the manufacturing method of the cover 40 can be increased.

In addition, according to the present embodiment, the breather 50 overlaps the projecting-direction extending portion 32a as viewed in the projecting direction Y. Therefore, the 2 nd hole portion 32f can be easily provided in a straight line, and the inside and the outside of the housing 15 can be easily connected via the

breathing holes

52d, 52 e.

In addition, according to the present embodiment, the breather 50 is attached so that the cylindrical portion 51 passes through the 1 st hole portion 32 e. When the ventilation device 50 having such a configuration is provided on the cover 40, the range of selection of the shape and the manufacturing method of the cover 40 is easily narrowed as described above. Therefore, in the configuration in which the ventilator 50 is provided in the 1 st hole portion 32e via the cylindrical portion 51, the effect of providing the ventilator 50 in the connector portion 32 can be more effectively obtained.

In addition, according to the present embodiment, the breather 50 is located below the terminal fixing portion 32 g. In other words, the breather 50 overlaps the terminal fixing portion 32g as viewed in the axial direction Z. Therefore, the space below the terminal fixing portion 32g protruding from the axially extending portion 32b in the protruding direction Y can be used as the arrangement space of the breather device 50, and the motor 11 can be prevented from being increased in size in the protruding direction Y.

In addition, according to the present embodiment, the end portion on the outer side in the protruding direction of the breather 50 is located on the inner side in the protruding direction than the end portion on the outer side in the protruding direction of the terminal fixing portion 32 g. Therefore, even if the air breather 50 is provided to the connector portion 32 having the terminal fixing portion 32g, the dimension in the protruding direction Y of the motor 11 is not increased by providing the air breather 50. Therefore, the motor 11 can be further suppressed from being enlarged.

In addition, according to the present embodiment, the connector portion 32 is provided to the bus bar holder 30 made of resin. Therefore, the connector portion 32 can be easily manufactured by injection molding or the like, and a structure for attaching the breather device 50 can be provided more easily.

An O-ring 53 is attached to the breather 50. In the present embodiment, the O-ring 53 is attached to the end portion of the body portion 51a on the outer side in the protruding direction. The O-ring 53 is annular and surrounds the body 51 a. The O-ring 53 contacts the outer peripheral surface of the body 51a, the inner peripheral surface of the 1 st hole 32e, and the inner surface of the bottom wall 52a in the protruding direction. The O-ring 53 seals between the outer peripheral surface of the cylindrical portion 51 and the inner peripheral surface of the 1 st hole portion 32 e. This can suppress the penetration of moisture and the like into the casing 15 through the 1 st hole 32 e.

As shown in fig. 3, the circuit board 60 has a plate shape with a plate surface facing the axial direction Z. The circuit board 60 is located on the upper side of the stator 14. The circuit board 60 is supported from below by the plurality of support portions 31c, and is fixed to each of the plurality of support portions 31c by a screw. Thereby, the circuit board 60 is held on the bus bar holder 30. The upper surface of the circuit board 60 is located above the annular portion 31 b.

Although not shown, another bus bar different from the bus bar 70 is connected to the circuit board 60. The other bus bars are connected to wires extending from unillustrated coils of the stator 14. Thereby, the bus bar 70 is electrically connected to the stator 14 via the other bus bars and the circuit board 60.

The inverter 61 is mounted on the circuit board 60. In the present embodiment, the inverter 61 is mounted on the lower surface of the circuit board 60. The inverter 61 has a plurality of transistors 61 a. The transistor 61a is, for example, a field effect transistor. The inverter 61 is electrically connected to the stator 14 via another bus bar, not shown, connected to the circuit board 60.

The capacitor 62 is an electronic component mounted on the upper surface of the circuit board 60. The capacitor 62 is electrically connected to the inverter 61 via the circuit board 60. Thereby, the capacitor 62 is electrically connected to the stator 14 via the circuit board 60, the inverter 61, and the other bus bar not shown.

As shown in fig. 2 and 3, the capacitor 62 has a cylindrical shape extending in a direction perpendicular to the axial direction Z. The capacitor 62 protrudes upward from the circuit board 60. As shown in fig. 2, in the present embodiment, the capacitor 62 is provided with two

capacitors

62a and 62 b. The capacitor 62a extends in the width direction X. The capacitor 62b extends in the projecting direction Y. The

capacitors

62a and 62b are arranged in the width direction X. When viewed in the protruding direction Y, the capacitor 62b overlaps the connector portion 32.

As shown in fig. 3, the cover 40 is fixed to the upper side of the bus bar holder 30. In the present embodiment, the cover 40 is manufactured by die casting. The cover 40 has a cover main body portion 40a and a plurality of fins 44. The cover body portion 40a covers the upper side of the circuit board 60. As shown in fig. 2, the cover main body portion 40a has a substantially circular shape when viewed in the axial direction Z. The cover main body portion 40a includes a base portion 41, a housing portion 42, and a fixing portion 43.

The base portion 41 has a substantially rectangular shape with rounded corners that are long in the projecting direction Y. As shown in fig. 3, the base 41 is a portion that covers the upper side of a portion of the circuit board 60 that is different from the portion where the capacitor 62 is mounted. The base portion 41 has a contact portion 41a protruding downward. The contact portion 41a overlaps the inverter 61 as viewed in the axial direction Z.

The housing 42 protrudes upward from the base 41 and covers the upper side of the capacitor 62. The interior of the housing portion 42 is open at the lower side and constitutes a part of the interior of the casing 15. At least a part of capacitor 62 is housed inside housing 42.

In this way, by projecting only a part of the cover main body portion 40a upward to serve as the housing portion 42 and housing at least a part of the capacitor 62, the cover main body portion 40a can be made smaller. Therefore, even when the capacitor 62 is relatively large, the size of the cover 40 can be suppressed from increasing, and the size of the motor 11 can be suppressed from increasing. Therefore, even if the output of the motor 11 is increased, the increase in size of the motor 11 can be suppressed. In addition, this also suppresses an increase in size of the pump device 10.

For example, when the capacitor is mounted on the lower surface of the circuit board, the entire circuit board is easily positioned above the circuit board 60 of the present embodiment, and the entire cover body portion is easily required to be positioned above. Therefore, the motor as a whole is more likely to be large-sized. In contrast, according to the present embodiment, the capacitor 62 is mounted on the upper surface of the circuit board 60. Therefore, the axial position of the circuit board 60 may be positioned further downward, and only the portion of the cover body 40a covering the upper side of the capacitor 62 may be protruded upward. Therefore, the size of the entire motor 11 can be further suppressed.

In addition, according to the present embodiment, the electronic component housed in the housing portion 42 is the capacitor 62. The capacitor 62 is particularly likely to be large in the electronic components mounted on the circuit board 60. Therefore, by housing the capacitor 62 in the housing portion 42, the motor 11 can be further suppressed from being increased in size.

In addition, according to the present embodiment, the cover 40 is manufactured by die casting. Therefore, as compared with the case where the cover 40 is formed by press working a plate member, the housing portion 42 having the minimum volume required for housing the capacitor 62 can be easily formed. This makes it easy to reduce the size of the housing portion 42, and the overall size of the motor 11 can be further suppressed from increasing.

In the present embodiment, the entire capacitor 62 except for the lower end portion thereof is housed inside the housing portion 42. As shown in fig. 2, the housing portion 42 is a portion of the cover main body portion 40a on the connector portion 32 side in the protruding direction Y. The entire housing portion 42 extends in the width direction X. The end portion on one side in the width direction of the housing portion 42 is located at a position separated to the other side in the width direction from the end portion on one side in the width direction of the base portion 41. The end portion on the other side in the width direction of the housing portion 42 is located at the same position in the width direction X as the end portion on the other side in the width direction of the base portion 41.

The housing 42 has a 1 st housing 42a and a 2 nd housing 42 b. The 1 st housing portion 42a is a portion on one side in the width direction of the housing portion 42. The 1 st accommodation portion 42a is substantially rectangular as viewed in the axial direction Z, and is long in the width direction X. The capacitor 62a is housed in the 1 st housing portion 42 a. The 2 nd accommodating portion 42b is a portion on the other side in the width direction of the accommodating portion 42. The 2 nd accommodating portion 42b has a substantially rectangular shape elongated in the projecting direction Y when viewed in the axial direction Z. The 2 nd accommodating portion 42b protrudes on both sides in the protruding direction than the 1 st accommodating portion 42 a. The capacitor 62b is housed in the 2 nd housing portion 42 b.

As shown in fig. 3, the fixing portion 43 is a portion below the base portion 41. The fixing portion 43 is fixed to the upper surface of the annular portion 31b by a screw. Thereby, the cover 40 and the bus bar holder 30 are fixed. The position in the axial direction Z of the fixing portion 43 is substantially the same as the position in the axial direction Z of the circuit board 60. As shown in fig. 2, the fixing portions 43 are provided on both sides in the width direction of the base portion 41 and both sides in the protruding direction of the base portion 41, respectively. The four fixing portions 43 are provided in the circumferential direction. Although not shown, the fixing portions 43 adjacent in the circumferential direction are connected to each other. Thus, the four fixing portions 43 form an annular fixing portion fixed to the upper surface of the annular portion 31 b. The annular fixing portion constituted by the four fixing portions 43 is in contact with the upper surface of the annular portion 31b via a gasket, for example.

The plurality of fins 44 are located on the upper surface of the base 41. Therefore, heat transferred from the circuit board 60 to the base portion 41 is easily released by the plurality of fins 44. This makes it possible to easily release the heat of the circuit board 60 to the outside of the pump device 10. Further, as described above, by projecting only a part of the cover main body portion 40a as the housing portion 42, the area of the base portion 41 on which the fins 44 are provided can be relatively large. Therefore, the number of fins 44 provided on the base 41 can be increased. Therefore, the heat of the circuit board 60 is more easily released to the outside of the pump apparatus 10 by the plurality of fins 44.

The plurality of fins 44 linearly extend in the projecting direction Y. The plurality of fins 44 are plate-shaped with plate surfaces facing in the width direction X. As shown in fig. 3, the upper end portions of the plurality of fins 44 are located at the same positions in the axial direction Z as the upper end portions of the housing portions 42. Therefore, the motor 11 and the pump device 10 can be prevented from being enlarged in the axial direction Z. In the present specification, the phrase "the upper end portions of the plurality of fins are located at the same positions in the axial direction Z as the upper end portions of the housing portion" also includes a case where the upper end portions of the plurality of fins are located at substantially the same positions in the axial direction Z as the upper end portions of the housing portion. As shown in fig. 1 and 2, the plurality of fins 44 includes a fin 44a and a fin 44 b.

The fins 44a are fins 44 extending in the projecting direction Y perpendicular to the axial direction Z and connected to the housing 42. The base 41 and the housing 42 are connected via the fins 44a by the fins 44a being connected to the housing 42. This can improve the strength of the cover 40.

The fin 44a is provided in plurality. The plurality of fins 44a includes 5 sets of a pair of fins 44a in the width direction X with the housing 42 interposed therebetween in the protruding direction Y. The end of the fin 44a opposite to the side connected to the housing portion 42 extends to the end of the cover 40 in the projecting direction Y. Of the pair of fins 44a, the pair of fins 44a closest to the other widthwise side are located at the other widthwise end of the base 41.

The fin 44b is the fin 44 closest to the width direction side. The fin 44b is located at one end in the width direction of the base 41. The fin 44b extends in the projecting direction Y at a position closer to one side in the width direction than the housing portion 42. The fin 44b is not connected to the housing 42, but extends from an end on one side in the protruding direction of the cover 40 to an end on the other side in the protruding direction.

As shown in fig. 3, the pump apparatus 10 also has a heat dissipation member 63 provided on the circuit board 60. The heat dissipation member 63 is, for example, a heat sink. The heat dissipation member 63 is in contact with a portion of the upper surface of the circuit board 60 that overlaps the inverter 61 when viewed in the axial direction Z and a lower surface of the base 41. This allows the heat of the inverter 61 to be released to the base 41 through the heat dissipation member 63. Therefore, heat of the inverter 61 can be appropriately released. As described above, in the present embodiment, the surface of the circuit board 60 on which the inverter 61 is mounted is the surface on the opposite side of the surface of the circuit board 60 on which the capacitor 62 is mounted. Therefore, the heat dissipation member 63 can be disposed on the same surface of the circuit board 60 as the capacitor 62. This enables heat of the inverter 61 to be appropriately released via the base 41. In the present embodiment, since the base portion 41 is provided with the plurality of fins 44, the heat of the inverter 61 can be more favorably released to the outside of the pump device 10.

In the present embodiment, the heat dissipation member 63 is in contact with the contact portion 41a protruding downward in the base portion 41. Therefore, the heat dissipation member 63 can be brought into contact with the base 41 while the position of the portion of the base 41 other than the contact portion 41a is positioned to some extent on the upper side. This makes it possible to easily dissipate heat from the inverter 61 while securing a space for disposing other electronic components mounted on the upper surface of the circuit board 60.

The present invention is not limited to the above embodiment, and other structures may be adopted. The electronic component housed in the housing is not particularly limited as long as it is an electronic component electrically connected to the stator, and may be an electronic component other than a capacitor. The electronic component housed in the housing portion may be an inverter, for example. The inverter may also be mounted on the upper side of the circuit board. The heat radiating member may not be provided.

The shroud may also be devoid of a plurality of fins. The cover may also be made by stamping the plate member. A plurality of the storage portions may be provided. The housing may also have no pin portion. The connector portion may be provided in a portion other than the bus bar holder as long as it is provided in the housing. The connector portion may extend entirely in the projecting direction Y. The end portion of the vent on the outer side in the protruding direction of the terminal fixing portion may be located at the same position as the end portion of the terminal fixing portion on the outer side in the protruding direction Y, or may be located on the outer side in the protruding direction than the end portion of the terminal fixing portion on the outer side in the protruding direction. The vent may be mounted on a portion other than the connector portion. The ventilation device may not be provided.

The pump device according to the above embodiment may be a pump device that conveys a fluid other than oil. The application of the pump device of the above embodiment is not particularly limited. The motor of the above embodiment is not particularly limited in its application, and may be mounted in a device other than the pump device. The respective structures described in this specification may be appropriately combined within a range not contradictory to each other.

The present application claims to be based on the priority of japanese application No. 2018-077974, which is a japanese application filed on 13/4/2018, and the entire contents of the description of the japanese application are cited.

Description of the reference symbols

10: a pump device; 11: a motor; 12: a pump section; 13: a rotor; 13 a: a shaft; 14: a stator; 15: a housing; 20: a housing; 21: a housing main body portion; 22: a flange portion; 24: a pin portion; 40: a cover; 40 a: a cover main body portion; 41: a base; 42: a storage section; 44. 44a, 44 b: a fin; 51 a: a main body portion; 60: a circuit board; 61: an inverter; 62. 62a, 62 b: a capacitor (electronic component); 63: a heat dissipating member; b: an installed body; ba: a recess; bd: a hole portion; j: a central axis; z: and (4) axial direction.

Claims

1. A motor is characterized in that a motor is provided,

the motor has:

a rotor having a shaft that rotates about a center axis;

a stator that is opposed to the rotor with a gap therebetween in a radial direction;

a circuit board located on one axial side of the stator, and having a board surface facing the axial direction;

an electronic component mounted on one axial surface of the circuit board and electrically connected to the stator; and

a housing that houses the rotor, the stator, the circuit board, and the electronic component,

the housing has a cover having a cover main body portion covering one axial side of the circuit board,

the cover main body portion includes:

a base portion that covers one axial side of a portion of the circuit board other than a portion on which the electronic component is mounted; and

a housing portion that protrudes to one axial side from the base portion and covers one axial side of the electronic component,

at least a part of the electronic component is housed inside the housing portion.

2. The motor of claim 1,

the motor further has an inverter mounted on the circuit board and electrically connected to the stator,

the electronic component is a capacitor electrically connected to the inverter.

3. The motor of claim 2,

the motor further has a heat dissipating member disposed on the circuit board,

the inverter is mounted on the other axial side surface of the circuit board,

the heat dissipation member is in contact with a portion of one surface of the circuit board in the axial direction that overlaps the inverter when viewed in the axial direction, and a surface of the other surface of the base in the axial direction.

4. The motor of claim 1,

the cover has a plurality of fins on an axially one-side face of the base.

5. The motor of claim 4,

the plurality of fins include fins extending in a direction perpendicular to the axial direction and connected to the receiving portion.

6. The motor of claim 4,

the end portions of the plurality of fins on one axial side are located at the same positions in the axial direction as the end portions of the housing portions on one axial side.

7. A pump device, characterized in that,

the pump device comprises:

the motor of claim 1; and

a pump section driven by the motor.

8. The pump arrangement according to claim 7,

the housing has a case fixed to an installed body,

the mounted body includes:

a recess recessed from one axial side of the mounted body toward the other axial side; and

a hole portion recessed from a portion of a surface on one axial side of the body to be attached, the portion being radially outward of the recess portion, toward the other axial side,

the housing has:

a case body portion that houses the pump portion and is housed in the recess;

a flange portion that protrudes radially outward from an end portion on one side in the axial direction of the housing main body portion; and

a pin portion projecting from the other axial side surface of the flange portion,

the flange portion is fixed to an axial one-side surface of the body to be mounted,

the pin portion is fitted in the hole portion.