WO2019198517A1

WO2019198517A1 - Motor and pump device

Info

Publication number: WO2019198517A1
Application number: PCT/JP2019/013421
Authority: WO
Inventors: 鄭旺姜; 孔二樋口; 国博梶田
Original assignee: 日本電産トーソク株式会社
Priority date: 2018-04-13
Filing date: 2019-03-27
Publication date: 2019-10-17
Also published as: CN213425978U; JPWO2019198517A1

Abstract

One embodiment of the motor of the present invention is provided with: a rotor having a shaft rotating about a center axis; a stator radially facing the rotor across a gap; a circuit board located on one axial side of the stator and having an axially facing board surface; an electronic component mounted on the surface of the circuit board, which is located on one axial side of the circuit board, the electronic component being connected electrically to the stator; and a case which contains the rotor, the stator, the circuit board, and the electronic component. The case has a cover having a cover body which covers the one axial side of the circuit board. The cover body has: a base section which covers one axial side of the portion of the circuit board, which is different from the portion of the circuit board, on which the electronic component is mounted; and a containing section which protrudes further toward one axial side than the base section and which covers one axial side of the electronic component. At least part of the electronic component is contained in the containing section.

Description

Motor and pump device

The present invention relates to a motor and a pump device.

A motor having a circuit board on which electronic components electrically connected to a stator are attached is known. For example, Patent Document 1 describes a motor including a control board on which an inverter circuit is mounted.

JP 2013-064356 A

In the motor as described above, when the motor output is increased, the electronic parts may be enlarged. For this reason, the case for housing the electronic component is increased in size, and the entire motor may be increased in size.

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 size even if the output of the motor is increased, and a pump device including such a motor. .

One aspect of the motor of the present invention includes a rotor having a shaft that rotates about a central axis, a stator that is opposed to the rotor via a gap in a radial direction, and a plate that is positioned on one side in the axial direction of the stator. A circuit board whose surface is directed in the axial direction, an electronic component that is attached to a surface on one side of the circuit board in the axial direction and is electrically connected to the stator, the rotor, the stator, the circuit board, and the electronic A case for housing the component. The case includes a cover having a cover main body that covers one side in the axial direction of the circuit board. The cover main body includes a base that covers one side in the axial direction of a portion of the circuit board that is different from the portion to which the electronic component is mounted, and one axial side of the electronic component that protrudes from the base in one axial direction. And a housing portion for covering. At least a part of the electronic component is accommodated in the accommodating portion.

One aspect of the pump device of the present invention includes the above motor and a pump unit driven by the motor.

According to one aspect of the present invention, an increase in the size of the motor can be suppressed even if the output of the motor is increased.

FIG. 1 is a perspective view showing a pump device of the present embodiment. FIG. 2 is a view of the pump device of this embodiment as viewed from above. FIG. 3 is a view showing the pump device of the present embodiment, and is a view partially showing a III-III cross section in FIG. FIG. 4 is a view showing a part of the pump device of the present embodiment, and is a cross-sectional view taken along the line IV-IV in FIG.

In each figure, the Z-axis direction is a vertical direction in which the positive side is the upper side and the negative side is the lower side. The axial direction of the central axis J, which is an imaginary axis as shown in each drawing, is parallel to the Z-axis direction, that is, the vertical direction. The X-axis direction is a direction orthogonal to the Z-axis direction. The Y-axis direction is a direction orthogonal 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 axial direction is referred to as “width direction X”, and a direction parallel to the Y axial direction is referred to as “axial direction Z”. This is called “projection 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, the radial direction centered on the central axis J is simply referred to as “radial direction”, and the circumferential direction centered on the central axis J is simply referred to as “circumferential direction”.

In this embodiment, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction. Here, the upper side and the lower side are simply names for explaining the relative positional relationship between the respective parts, and the actual positional relationship or the like may be a positional relationship other than the positional relationship indicated by these names. .

1 to FIG. 4 is an electric oil pump for sending oil, for example. 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 drive unit in a vehicle. The mounted body B includes a recess Ba, an import Bb, an outport (not shown), a groove Bc, and a hole Bd. The recessed portion Ba is recessed downward from the upper surface of the mounted body B. Although illustration is omitted, the inner surface of the recess Ba has a circular shape centered on the central axis J as viewed along the axial direction Z, for example. The import Bb opens at the bottom surface of the recess Ba. The import Bb is located at a position shifted in the radial direction with respect to the central axis J. Although not shown, the outport opens on the inner surface of the recess Ba at a position different from the import Bb. The pump device 10 sucks oil from the import Bb by a pump unit 12 described later, and discharges oil from the outport.

The groove Bc is recessed downward from a portion on the upper side of the attachment body B on the outer side in the radial direction with respect to the recess Ba. Although not shown, the groove Bc is an annular shape that surrounds the recess Ba when viewed along 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 attachment body B that is radially outer than the recess Ba. In the present embodiment, the hole Bd is recessed downward from a portion on the upper side of the body B to be attached to the outer side in the radial direction from the groove Bc. 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 unit 12 driven by the motor 11. The pump unit 12 includes an inner rotor 12a, an outer rotor 12b positioned on the radially outer side of the inner rotor 12a, and a pump chamber 12c that houses the inner rotor 12a and the outer rotor 12b. The inner rotor 12a and the outer rotor 12b are pump gears and mesh with each other.

The motor 11 drives the pump unit 12 by rotating the inner rotor 12a. As shown in FIGS. 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, and a capacitor 62. And a cover 40.

As shown in FIG. 1, in this embodiment, a case 15 is configured by a bus bar holder main body 31 and a cover 40 described later in the housing 20 and the bus bar holder 30. That is, the motor 11 includes a case 15 having a housing 20, a bus bar holder main body portion 31, and a cover 40. As shown in FIG. 3, the case 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 main body 13b. The shaft 13a rotates about the central axis J. In the present embodiment, the shaft 13a has a cylindrical shape extending in the axial direction Z with the central axis J as the center. The inner rotor 12a is fixed to the lower end of the shaft 13a. The rotor main body 13b is fixed to the outer peripheral surface of the shaft 13a. Although illustration is omitted, the rotor main body 13b has a rotor core and a rotor magnet.

The stator 14 is opposed to the rotor 13 via a gap in the radial direction. The stator 14 is located on the radially outer side of the rotor 13. Although illustration is omitted, the stator 14 includes a stator core and a plurality of coils attached to the stator core.

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

The flange portion 22 protrudes radially outward from the upper end portion of the housing body portion 21. The flange portion 22 is fixed to the upper surface of the attached body B. The lower surface of the flange portion 22 is in contact with the upper surface of the mounted body B. The flange portion 22 includes a flange portion main body 22a and an attachment portion 22b. As shown in FIG. 1, the flange portion main body 22 a has a substantially annular shape with the central axis J as the center. As shown in FIG. 3, the lower surface of the flange portion main body 22a closes the upper opening of the groove portion Bc. The O-ring Be is in contact with the lower surface of the flange portion main body 22a. Thereby, O-ring Be seals between the lower surface of the flange part 22, and the upper surface of the to-be-attached body B. As shown in FIG.

The mounting portion 22b protrudes radially outward from the flange portion main body 22a. As shown in FIG. 2, in the present embodiment, three attachment portions 22b are provided along the circumferential direction. Each mounting portion 22b is fixed to the upper surface of the body to be mounted B by screws. In the present embodiment, the housing body 21 and the flange 22 are part of the same single member.

As shown in FIG. 3, the pump cover portion 23 is fixed to the lower end portion of the housing main body portion 21 with a screw. The pump cover part 23 includes a pump cover part main body 23a and a protruding part 23b. The pump cover main body 23a has a disk shape centered on the central axis J. The pump cover main body 23a closes the lower opening of the housing main body 21. The protrusion 23b protrudes downward from the pump cover body 23a. The protruding portion 23b has a cylindrical shape that opens on both sides in the axial direction. The protruding portion 23b is located at a position shifted in the radial direction with respect to the central axis J.

Projection 23b is inserted into import Bb. Oil is sucked into the pump unit 12 from the import Bb through the inside of the protrusion 23b. An annular O-ring 23c is attached to the outer peripheral surface of the protrusion 23b. The O-ring 23c seals between the outer peripheral surface of the protrusion 23b and the inner peripheral surface of the import Bb.

The housing 20 further has a pin portion 24. The pin portion 24 projects 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 of the central axis J in the radial direction. The pin portions 24 are fitted into the hole portions Bd, respectively. Thereby, the housing 20 can be accurately positioned with respect to the mounted body B in the circumferential direction and the radial direction. Therefore, it can suppress that the housing main-body part 21 moves to the circumferential direction and radial direction in recessed part Ba, and the protrusion part 23b can move to the circumferential direction and radial direction in import Bb.

The bus bar holder 30 is fixed to the upper side of the housing 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 made, for example, by insert molding using the bus bar 70 as an insert member. The bus bar holder 30 includes a bus bar holder main body portion 31 and a connector portion 32. That is, the motor 11 includes a bus bar holder main body portion 31 and a connector portion 32.

The bus bar holder body 31 has a bottom 31a, an annular portion 31b, and a support 31c. That is, the bus bar holder 30 has a bottom portion 31a, an annular portion 31b, and a support portion 31c. The bottom 31a has a substantially disk shape that expands in the radial direction. Although illustration is omitted, the radially outer edge portion of the bottom portion 31a is in contact with the upper surface of the flange portion main body 22a via a gasket. The annular portion 31b is an annular shape that protrudes upward from the radially outer edge portion of the bottom portion 31a. The annular portion 31b surrounds the central axis J. The radially outer surface of the annular portion 31 b is a part of the radially outer surface of the case 15. That is, the annular portion 31 b constitutes a part of the radially outer surface of the case 15. The support portion 31c protrudes upward from the bottom portion 31a on the radially inner side of the annular portion 31b. Although illustration is omitted, a plurality of support portions 31c are provided, for example.

For example, an external power supply that supplies power to the stator 14 is connected to the connector portion 32. The connector part 32 is provided in the radial direction outer surface of the annular part 31b. That is, the connector part 32 is provided in the case 15. As shown in FIG. 2, in the present embodiment, the connector portion 32 is located on the other side in the width direction with respect to the central axis J. As shown in FIG. 4, the connector part 32 has the protrusion direction extending | stretching part 32a, the axial direction extension part 32b, and the terminal fixing | fixed part 32g. The protruding direction extending portion 32a extends from the annular portion 31b in the protruding direction Y orthogonal to the axial direction Z. That is, the protruding direction extending portion 32 a extends from the case 15 in the protruding direction Y.

In the following description, in the relative positional relationship of the bus bar holder main body 31 and the connector part 32 in the protruding direction Y, the connector part 32 side, that is, the positive side in the Y-axis direction is referred to as “the protruding direction outer side”. The holder body 31 side, that is, the negative side in the Y-axis direction is referred to as “inner side in the protruding direction”.

The axially extending portion 32b extends in the axial direction Z. In the present embodiment, the axially extending portion 32b extends upward from the tip end portion of the protruding direction extending portion 32a, that is, the end portion on the outer side in the protruding direction. The axially extending portion 32b has a connection recess 32c. The connection recess 32c is recessed downward from the upper end of the axially extending portion 32b. A terminal of an external power source is inserted into the connection recess 32c.

The terminal fixing portion 32g is provided on the side surface of the axially extending portion 32b. More specifically, the terminal fixing portion 32g is provided on the outer surface in the protruding direction of the axially extending portion 32b. As shown in FIGS. 1 and 4, the terminal fixing portion 32g has a rectangular tube shape having an opening 32i that opens upward. As illustrated in FIG. 4, the terminal fixing portion 32g includes a claw portion 32h that protrudes inward in the protruding direction from the outer surface in the protruding direction among the inner surface of the opening 32i. A fixing claw portion provided at a terminal of an external power source (not shown) is inserted into the terminal fixing portion 32g. The fixed claw portion is hooked on the claw portion 32h from below by a snap fit. As a result, the terminal of the external power source is prevented from coming off from the connector part 32, and the terminal of the external power source is fixed to the connector part 32.

The connector part 32 further has a connection hole part 32d, a first hole part 32e, and a second hole part 32f. The coupling hole 32d is recessed downward from the bottom surface of the connection recess 32c. The connection hole 32d is a hole having a bottom. The lower end of the coupling hole 32d overlaps the protruding direction extending portion 32a when viewed along the protruding direction Y. The first hole portion 32 e opens on the outer surface of the connector portion 32. The first hole 32e penetrates in the protruding direction Y from the outer surface in the protruding direction to the connecting hole 32d at the lower end of the axially extending portion 32b. The inner diameter of the first hole portion 32e becomes smaller toward the inner side in the protruding direction. The inner peripheral surface of the first hole portion 32e is a tapered surface.

The second hole 32f is recessed inward in the protruding direction from the inner surface of the coupling hole 32d, and extends in the protruding direction Y to the radial inner surface of the annular portion 31b through the protruding direction extending portion 32a. As a result, the second hole 32 f is connected to the first hole 32 e via the connection hole 32 d and extends to the inside of the case 15.

In this embodiment, a part of the bus bar 70 is embedded and held in the bus bar holder 30. The bus bar 70 is an elongated plate-like member. For example, a plurality of bus bars 70 are provided. The bus bar 70 has a terminal portion 71 exposed to the outside of the case 15 via the connector portion 32. The terminal portion 71 protrudes upward from the bottom surface of the connection recess 32c and is exposed to the outside of the case 15 through the connection recess 32c. 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 source connected to the connector portion 32 via the terminal portion 71. Although not shown, the other end of the bus bar 70 is exposed inside the case 15 and connected to the circuit board 60.

The breather 50 is provided in the connector portion 32. More specifically, the breather 50 is provided on the side surface of the axially extending portion 32b. In the present embodiment, the breather 50 is provided on the outer surface in the protruding direction at the lower end of the axially extending portion 32b. The breather 50 overlaps the protruding direction extending portion 32a when viewed along the protruding direction Y. The breather 50 is located below the terminal fixing portion 32g. The breather 50 has a cylindrical part 51 and a large diameter part 52.

The cylindrical portion 51 has a cylindrical shape that extends in the protruding direction Y and opens on both sides of the protruding direction. The cylindrical part 51 is passed through the first hole part 32e. The cylindrical part 51 has a main body part 51a and a protruding claw part 51b. The main body 51a is a part that passes through the first hole 32e. The end of the main body 51a on the inner side in the protruding direction is inserted into the coupling hole 32d. The protruding claw portion 51 b protrudes outward from the inner end portion of the main body portion 51 a in the radial direction of the tubular portion 51. The protruding claw portion 51b is hooked on the inner side surface of the connecting hole portion 32d from the inner side in the protruding direction by snap fit. Thereby, it can suppress that the cylindrical part 51 comes off from the 1st hole 32e, and can suppress that the breather 50 remove | deviates from the connector part 32. FIG.

The large diameter portion 52 is connected to the 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 case 15. The large diameter part 52 is a hollow part. 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 along the protruding direction Y. As shown in FIG. 4, the large diameter portion 52 has a bottom wall portion 52a, a peripheral wall portion 52b, and a top wall portion 52c.

The bottom wall portion 52a is in the shape of an annular plate that extends outward from the outer end of the tubular portion 51 in the projecting direction in the radial direction of the tubular portion 51. The bottom wall 52a has a breathing hole 52e that penetrates the bottom wall 52a in the protruding direction Y. That is, the breather 50 has a breathing hole 52e. Although illustration is omitted, a plurality of breathing holes 52e are provided along the circumferential direction.

The peripheral wall 52b is an annular wall that protrudes outward in the protruding direction from the outer peripheral edge of the bottom wall 52a. The peripheral wall portion 52 b has a breathing hole 52 d that penetrates the peripheral wall portion 52 b in the radial direction of the tubular portion 51. That is, the breather 50 has a breathing hole 52d. Although not shown, the breathing hole 52d extends in the circumferential direction around the central axis of the cylindrical portion 51. Although illustration is omitted, a plurality of breathing holes 52d are provided along the circumferential direction with the central axis of the cylindrical portion 51 as the center. The top wall 52c is connected to the end of the peripheral wall 52b on the outer side in the protruding direction.

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

The breathing holes 52d and 52e connect the inside of the case 15 to the outside. In the present embodiment, the breathing holes 52d and 52e are provided in the large diameter portion 52, and the second hole 32f, the connecting hole 32d, the inside of the cylindrical portion 51, and the inside of the large diameter portion 52 are provided in the case 15. Connect the inside and the outside. Since the breather 50 having

such breathing holes

52d and 52e is provided, the air inside the case 15 can be extracted to the outside through the breathing holes 52d and 52e.

Also, for example, when a breather is provided in the bus bar holder main body, the bus bar holder main body tends to be enlarged in the axial direction Z because the first hole is provided. Therefore, the whole motor tends to be large. On the other hand, according to this embodiment, since the breather 50 is provided in the connector part 32, it can suppress that the bus-bar holder main-body part 31 enlarges in the axial direction Z, and the motor 11 whole is large in the axial direction Z. Can be suppressed. Moreover, since the connector part 32 has the axial direction extension part 32b, compared with the case where the whole extends in the protrusion direction Y, it is easy to miniaturize the connector part 32 in the protrusion direction Y. Thereby, the motor 11 whole can be reduced in size in the protrusion direction Y. Therefore, it can suppress that the motor 11 provided with the breather 50 enlarges. Moreover, it can suppress that the pump apparatus 10 provided with the motor 11 enlarges.

Even if the shape or the like of the breather 50 is changed, it is only necessary to change the shape of the connector portion 32 to which the breather 50 is attached, and it is necessary to change the shape of the case 15 such as the bus bar holder main body portion 31 or the like. Absent. Therefore, when the shape or the like of the breather 50 is changed, the design of the pump device 10 can be easily changed.

Also, for example, when the cover is made by pressing a plate member, the cover becomes thin. Therefore, it may be difficult to attach a breather having a shape like the above-described breather 50 only by simply providing a hole in the cover. As described above, when the cover is provided with a structure for attaching the breather, the range of selection of the shape of the cover and the manufacturing method may be reduced. On the other hand, according to this embodiment, since the breather 50 is provided in the connector part 32, the shape and manufacturing method of the cover 40 are not limited by the breather 50, and the shape and manufacturing method of the cover 40 are selected. The width of can be increased.

Further, according to the present embodiment, the breather 50 overlaps the protruding direction extending portion 32a as viewed along the protruding direction Y. Therefore, it is easy to provide the second hole portion 32f in a straight line, and it is easy to connect the inside and the outside of the case 15 via the breathing holes 52d and 52e.

Further, according to the present embodiment, the breather 50 is attached by passing the cylindrical portion 51 through the first hole portion 32e. When the breather 50 having such a configuration is provided on the cover 40, as described above, the range of selection of the shape of the cover 40 and the manufacturing method tends to be particularly narrow. Therefore, in the configuration in which the breather 50 is provided in the first hole portion 32e via the cylindrical portion 51, the effect obtained by providing the breather 50 in the connector portion 32 can be obtained more usefully.

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

Further, according to the present embodiment, the end portion on the outer side in the projecting direction of the breather 50 is located on the inner side in the projecting direction than the end portion on the outer side in the projecting direction of the terminal fixing portion 32g. Therefore, even if the breather 50 is provided for the connector portion 32 having the terminal fixing portion 32g, the provision of the breather 50 does not increase the dimension in the protruding direction Y of the motor 11. Therefore, it can suppress more that the motor 11 enlarges.

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

The O-ring 53 is attached to the breather 50. In the present embodiment, the O-ring 53 is attached to the end portion on the outer side in the protruding direction of the main body 51a. The O-ring 53 has an annular shape surrounding the main body 51a. The O-ring 53 is in contact with the outer peripheral surface of the main body 51a, the inner peripheral surface of the first hole 32e, and the inner surface in the protruding direction of the bottom wall portion 52a. The O-ring 53 seals between the outer peripheral surface of the cylindrical portion 51 and the inner peripheral surface of the first hole portion 32e. Thereby, it can suppress that a water | moisture content etc. permeate the inside of the case 15 through the 1st hole 32e.

As shown in FIG. 3, the circuit board 60 has a plate shape whose plate surface faces the axial direction Z. The circuit board 60 is located above the stator 14. The circuit board 60 is supported from below by the plurality of support portions 31c, and is fixed to the plurality of support portions 31c by screws. Thereby, the circuit board 60 is held by the bus bar holder 30. The upper surface of the circuit board 60 is positioned above the annular portion 31b.

Although illustration is omitted, the circuit board 60 is connected to another bus bar different from the bus bar 70. The other bus bar is connected to a conductive wire extending from a coil (not shown) of the stator 14. As a result, the bus bar 70 is electrically connected to the stator 14 via the other bus bar and the circuit board 60.

The inverter 61 is attached to the circuit board 60. In the present embodiment, the inverter 61 is attached to the lower surface of the circuit board 60. The inverter 61 includes a plurality of transistors 61a. 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 described above.

The capacitor 62 is an electronic component attached to the upper surface of the circuit board 60. Capacitor 62 is electrically connected to inverter 61 through circuit board 60. Thus, 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) described above.

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

capacitors

62a and 62b are provided as the capacitor 62. The capacitor 62a extends in the width direction X. The capacitor 62b extends in the protruding direction Y. The

capacitors

62a and 62b are arranged side by side in the width direction X. The capacitor 62 b overlaps with the connector portion 32 when viewed along the protruding direction Y.

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

The base 41 has a substantially rectangular shape with rounded corners that are long in the protruding 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 to which the capacitor 62 is attached. The base 41 has a contact portion 41a that protrudes downward. The contact portion 41 a overlaps the inverter 61 when viewed along the axial direction Z.

The accommodating portion 42 is a portion that protrudes above the base portion 41 and covers the upper side of the capacitor 62. The interior of the accommodating portion 42 opens downward and constitutes a part of the interior of the case 15. At least a part of the capacitor 62 is accommodated in the accommodating portion 42.

As described above, only a part of the cover body 40a protrudes upward to form the housing part 42, and at least a part of the capacitor 62 is housed, so that the cover body 40a can be downsized. Therefore, even when the capacitor 62 is relatively large, the cover 40 can be prevented from increasing in size, and the motor 11 can be prevented from increasing in size. Therefore, even if the output of the motor 11 is increased, the motor 11 can be prevented from increasing in size. Moreover, it can also suppress that the pump apparatus 10 enlarges.

Further, for example, when the capacitor is attached to the lower surface of the circuit board, the entire circuit board is likely to be positioned above the circuit board 60 of the present embodiment, and the entire cover main body is positioned above. Necessary. Therefore, the whole motor is likely to be larger. On the other hand, according to the present embodiment, the capacitor 62 is attached to the upper surface of the circuit board 60. Therefore, the axial position of the circuit board 60 can be positioned on the lower side, and only the portion of the cover main body 40a that covers the upper side of the capacitor 62 needs to protrude upward. Therefore, it can suppress more that the motor 11 whole enlarges.

Further, according to the present embodiment, the electronic component housed in the housing portion 42 is the capacitor 62. The capacitor 62 tends to be particularly large among electronic components mounted on the circuit board 60. Therefore, housing the capacitor 62 in the housing portion 42 can further suppress the motor 11 from becoming large.

Further, according to the present embodiment, the cover 40 is made by die casting. Therefore, compared with the case where the cover 40 is made by pressing the plate member, it is easier to make the housing portion 42 having the minimum volume necessary for housing the capacitor 62. Thereby, the magnitude | size of the accommodating part 42 can be made small easily and it can suppress more that the motor 11 whole enlarges.

In the present embodiment, the entire portion excluding the lower end portion of the capacitor 62 is accommodated in the accommodating portion 42. As shown in FIG. 2, the accommodating part 42 is a part near the connector part 32 side in the protruding direction Y in the cover main body part 40a. The accommodating part 42 extends in the width direction X as a whole. The end portion on one side in the width direction of the accommodating portion 42 is located at a position farther to the other side in the width direction than 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 accommodating 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 accommodating part 42 has a first accommodating part 42a and a second accommodating part 42b. The first accommodating portion 42 a is a portion on one side in the width direction of the accommodating portion 42. The first accommodating portion 42 a has a substantially rectangular shape that is long in the width direction X when viewed along the axial direction Z. A capacitor 62a is accommodated in the first accommodating portion 42a. The second accommodating portion 42 b is a portion on the other side in the width direction of the accommodating portion 42. The second housing portion 42b has a substantially rectangular shape that is long in the protruding direction Y when viewed along the axial direction Z. The 2nd accommodating part 42b protrudes in the protrusion direction both sides rather than the 1st accommodating part 42a. The capacitor 62b is accommodated in the second accommodating portion 42b.

As shown in FIG. 3, the fixing portion 43 is a portion positioned below the base portion 41. The fixing portion 43 is fixed to the upper surface of the annular portion 31b with a screw. Thereby, the cover 40 and the bus bar holder 30 are fixed. The position of the fixing portion 43 in the axial direction Z is substantially the same as the position of the circuit board 60 in the axial direction Z. As shown in FIG. 2, the fixing portions 43 are provided on both sides in the width direction of the base portion 41 and on both sides in the protruding direction of the base portion 41. The four fixing portions 43 are provided along the circumferential direction. Although illustration is omitted, the fixing portions 43 adjacent to each other in the circumferential direction are connected to each other. As a result, an annular fixing portion that is fixed to the upper surface of the annular portion 31b by the four fixing portions 43 is configured. The annular fixing part constituted by the four fixing parts 43 comes into contact with the upper surface of the annular part 31b via a gasket, for example.

The plurality of fins 44 are located on the upper surface of the base 41. Therefore, the heat transmitted from the circuit board 60 to the base 41 is easily released by the plurality of fins 44. Thereby, the heat of the circuit board 60 can be easily released 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 accommodating portion 42, a relatively large area of the base portion 41 on which the fins 44 are provided can be secured. 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 device 10 by the plurality of fins 44.

The plurality of fins 44 extend linearly in the protruding direction Y. The plurality of fins 44 have a plate shape whose plate surface faces the width direction X. As shown in FIG. 3, the upper end portions of the plurality of fins 44 are located at the same position in the axial direction Z as the upper end portion of the accommodating portion 42. Therefore, it is possible to prevent the motor 11 and the pump device 10 from increasing in size in the axial direction Z. In the present specification, “the upper end portions of the plurality of fins are positioned at the same position in the axial direction Z as the upper end portion of the housing portion” means that the upper end portions of the plurality of fins are the housing portion. It also includes being located at substantially the same position in the axial direction Z as the upper end of the. As shown in FIGS. 1 and 2, the plurality of fins 44 include fins 44a and fins 44b.

The fins 44 a are fins 44 that extend in the protruding direction Y orthogonal to the axial direction Z and are connected to the accommodating portion 42. As the fins 44a are connected to the accommodating portion 42, the base 41 and the accommodating portion 42 are connected via the fins 44a. Thereby, the intensity | strength of the cover 40 can be improved.

A plurality of fins 44a are provided. The plurality of fins 44 a includes five pairs of fins 44 a that sandwich the accommodating portion 42 in the protruding direction Y along the width direction X. The end of the fin 44 a opposite to the side connected to the accommodating portion 42 extends to the end of the cover 40 in the protruding direction Y. The pair of fins 44 a located on the other side in the width direction among the pair of fins 44 a is located at the end of the base 41 on the other side in the width direction.

The fins 44b are the fins 44 that are located on one side in the width direction. The fin 44b is located at the end of the base 41 on one side in the width direction. The fins 44b extend in the protruding direction Y on one side in the width direction from the accommodating portion 42. The fins 44 b are not connected to the accommodating portion 42 and extend from the end on one side in the protruding direction of the cover 40 to the end on the other side in the protruding direction.

As shown in FIG. 3, the pump device 10 further includes a heat radiating member 63 provided on the circuit board 60. The heat dissipation member 63 is, for example, a heat dissipation sheet. The heat dissipating member 63 contacts a portion of the upper surface of the circuit board 60 that overlaps with the inverter 61 when viewed along the axial direction Z and a lower surface of the base 41. Thereby, the heat of the inverter 61 can be released to the base 41 via the heat dissipation member 63. Therefore, the heat of the inverter 61 can be suitably released. Thus, in this embodiment, since the surface of the circuit board 60 to which the inverter 61 is attached is the surface opposite to the surface of the circuit board 60 to which the capacitor 62 is attached, the heat dissipation member 63 is disposed on the same side as the capacitor 62. It can be arranged on the surface of the circuit board 60. Thereby, the heat of the inverter 61 can be suitably discharged via the base 41. In the present embodiment, since the plurality of fins 44 are provided in the base portion 41, the heat of the inverter 61 can be more appropriately released to the outside of the pump device 10.

In the present embodiment, the heat dissipation member 63 comes into contact with the contact portion 41a protruding downward from the base portion 41. Therefore, the heat radiating member 63 can be brought into contact with the base 41 while positioning the portion of the base 41 other than the contact portion 41a to some extent on the upper side. Accordingly, it is possible to easily release the heat of the inverter 61 while securing a space for arranging other electronic components attached to the upper surface of the circuit board 60.

The present invention is not limited to the above-described embodiment, and other configurations can be adopted. The electronic component housed in the housing portion 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 be attached to the upper surface of the circuit board. The heat dissipation member may not be provided.

The cover may not have a plurality of fins. The cover may be made by pressing a plate member. A plurality of accommodating portions may be provided. The housing may not have a pin portion. If the connector part is provided in the case, it may be provided in a part other than the bus bar holder. The entire connector portion may extend in the protruding direction Y. The outer end of the breather in the protruding direction may be located at the same position in the protruding direction Y as the protruding end of the terminal fixing portion, or the outer end of the terminal fixing portion in the protruding direction. May be located. The breather may be attached to a portion other than the connector portion. The breather may not be provided.

The pump device of the above-described embodiment may be a pump device that sends fluid other than oil. The use of the pump device of the embodiment described above is not particularly limited. The application of the motor of the above-described embodiment is not particularly limited, and may be mounted on equipment other than the pump device. Each structure demonstrated in this specification can be combined suitably in the range which does not contradict each other.

This application claims priority based on Japanese Patent Application No. 2018-079774, which was filed on April 13, 2018, and uses all the contents described in the Japanese application.

DESCRIPTION OF SYMBOLS 10 ... Pump apparatus, 11 ... Motor, 12 ... Pump part, 13 ... Rotor, 13a ... Shaft, 14 ... Stator, 15 ... Case, 20 ... Housing, 21 ... Housing main-body part, 22 ... Flange part, 24 ... Pin part, DESCRIPTION OF SYMBOLS 40 ... Cover, 40a ... Cover main-body part, 41 ... Base part, 42 ... Accommodating part, 44, 44a, 44b ... Fin, 51a ... Main-body part, 60 ... Circuit board, 61 ... Inverter, 62, 62a, 62b ... Capacitor (electronic Parts), 63 ... radiation member, B ... attached body, Ba ... concave, Bd ... hole, J ... center axis, Z ... axial direction

Claims

A rotor having a shaft that rotates about a central axis;
A stator facing the rotor via a gap in the radial direction;
A circuit board located on one side in the axial direction of the stator, the plate surface facing the axial direction;
An electronic component that is attached to the surface on one side in the axial direction of the circuit board and is electrically connected to the stator;
A case for housing the rotor, the stator, the circuit board, and the electronic component;
With
The case has a cover having a cover main body that covers one side in the axial direction of the circuit board,
The cover body is
A base that covers one side in the axial direction of a portion different from a portion to which the electronic component is attached in the circuit board;
A housing portion that protrudes in the axial direction from the base and covers the electronic component in the axial direction;
Have
A motor in which at least a part of the electronic component is housed in the housing portion.
An inverter attached to the circuit board and electrically connected to the stator;
The motor according to claim 1, wherein the electronic component is a capacitor electrically connected to the inverter.
A heat dissipating member provided on the circuit board;
The inverter is attached to the surface on the other axial side of the circuit board,
The heat dissipation member is in contact with a portion of the surface on one side in the axial direction of the circuit board that overlaps with the inverter as viewed along the axial direction and a surface on the other side in the axial direction of the base. The motor described.
The motor according to any one of claims 1 to 3, wherein the cover has a plurality of fins located on a surface on one axial side of the base.
The motor according to claim 4, wherein the plurality of fins include fins extending in a direction orthogonal to an axial direction and connected to the housing portion.
6. The motor according to claim 4, wherein an end portion on one side in the axial direction of the plurality of fins is located at the same position in the axial direction as an end portion on the one side in the axial direction of the housing portion.
The motor according to any one of claims 1 to 6,
A pump unit driven by the motor;
A pump device comprising:
The case has a housing fixed to the attached body,
The attached body is
A recess recessed from the surface on one side in the axial direction of the attached body to the other side in the axial direction;
Of the surface on the one side in the axial direction of the attached body, a hole that is recessed from the portion on the outer side in the radial direction than the concave portion to the other side in the axial direction;
Have
The housing is
A housing body that houses the pump and is housed in the recess;
A flange portion projecting radially outward from an end portion on one axial side of the housing body portion;
A pin portion projecting from the surface on the other axial side of the flange portion to the other axial side;
Have
The flange portion is fixed to a surface on one side in the axial direction of the attached body,
The pump device according to claim 7, wherein the pin portion is fitted into the hole portion.