JP2022155506A - electric pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric pump capable of reducing size in the radial direction.

SOLUTION: An electric pump includes: a motor having a shaft rotatable around a central axis; a pump mechanism connected to one side in the axial direction of the shaft; a circuit board 40 positioned outside in the radial direction orthogonal to the axial direction of the shaft; and a housing body capable of storing the motor and the circuit board. The circuit board has a plate surface opposing to the shaft and along the axial direction. The housing body includes a motor housing 211, a substrate housing 213, a pump housing 212, and a mounting plate part positioned outside in the radial direction orthogonal to the axial direction of the shaft. The mounting plate part includes a mounting surface opposing to the shaft and along the axial direction. The motor and the pump mechanism are positioned on the inner angle side of a corner where a third surface containing the plate surface crosses a fourth surface containing the mounting surface.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to electric pumps.

Conventionally, a configuration is known in which a heat sink is provided outside a motor unit, a power system circuit component such as an FET is fixed to the heat sink with screws, and heat generated in the power system circuit component is dissipated.

JP 2004-159392 A

In the motor unit of Patent Document 1, the heat generated from the motor cannot be dissipated quickly, and there is a risk that the motor will break when it reaches a high temperature. There is a risk that the size of the motor will be increased.

According to one aspect of the present invention , a motor having a shaft rotatable around a central axis, a pump mechanism connected to one axial side of the shaft, and a pump mechanism positioned radially outward perpendicular to the axial direction of the shaft A circuit board and a housing body capable of accommodating the motor and the circuit board are provided. The circuit board faces the shaft and has a plate surface along the axial direction, which is a first surface having electronic components and a second surface on the opposite side of the first surface, and the housing body accommodates the motor. It has a housing portion, a substrate housing portion that accommodates the circuit board, a pump housing portion that accommodates the pump mechanism, and a mounting plate portion positioned radially outward perpendicular to the axial direction of the shaft. The motor and the pump mechanism are located on the inner corner side of the intersection between the third plane including the plate surface and the fourth plane including the mounting surface.

According to one aspect of the present invention, an electric pump that can be made radially compact is provided.

FIG. 1 is a cross-sectional view of the electric pump of this embodiment. FIG. 2 is a perspective view showing the internal structure of the electric pump of this embodiment. FIG. 3 is a perspective view showing the busbar unit of this embodiment. FIG. 4 is a cross-sectional view of the electric pump along the first connecting portion. FIG. 5 is a partial cross-sectional view of the housing and motor. FIG. 6 is a perspective view showing the inside of the third housing recess. FIG. 7 is a view of the inside of the third accommodation recess viewed from the − side in the Z direction to the + side. FIG. 8 is a cross-sectional view of a portion of the electric pump of the present embodiment taken in a direction crossing the axial direction on the rear side of the second connecting portion. FIG. 9 is a cross-sectional view of a portion of the electric pump of the present embodiment taken in a direction crossing the axial direction on the front side of the second connecting portion. FIG. 10 is a schematic diagram of the electric pump of this embodiment viewed from the axial direction. FIG. 11 is a perspective view showing the external structure of the electric pump of this embodiment. FIG. 12 is a perspective view schematically showing each channel of this embodiment.

An electric oil pump will be described below as an example of an electric motor and an electric pump according to the present embodiment. The electric oil pump of the embodiment is used to supply oil to equipment mounted on a vehicle or the like.

In each drawing referred to below, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. In the XYZ coordinate system, the X-axis direction is parallel to the axial direction of the central axis J shown in FIGS. The central axis J is the central axis of the shaft 21 of the motor 220, which will be described later. The Y-axis direction is a direction parallel to the depth direction in FIGS. 1 and 5 among the directions perpendicular to the X-axis. The Z-axis direction is a direction orthogonal to both the X-axis direction and the Y-axis direction, and is a direction parallel to the vertical direction in FIGS. In any of the X-axis direction, Y-axis direction, and Z-axis direction, the side to which the arrow shown in the drawing points is the + side, and the opposite side is the - side.

In the following description, the direction parallel to the central axis J (X-axis direction) is simply referred to as the "axial direction" unless otherwise specified. A radial direction centered on the central axis J is simply referred to as a “radial direction”. The circumferential direction centered on the central axis J, that is, the circumference of the central axis J (the direction of θ) is simply referred to as the “circumferential direction”.

Also, the positive side (+X side) in the X-axis direction may be referred to as the "front side". Similarly, the negative side (-X side) in the X-axis direction may be referred to as the "rear side". The front side (+X side) corresponds to one axial side in the present invention. The rear side (−X side) corresponds to the other axial side in the present invention.

An electric oil pump 200 according to the present embodiment will be described below with reference to FIGS. 1 to 12. FIG.

The electric oil pump 200 of this embodiment includes a housing 210, a motor 220, a pump mechanism 30, and a circuit board 40, as shown in FIGS.
The housing 210 includes a motor housing 211 (motor housing) that houses the motor 220, a pump housing 212 that houses the pump mechanism 30, a board housing 213 (circuit board housing) that houses the circuit board 40, and a motor housing 211. It has a partition wall portion 330 that separates the (motor accommodating portion) and the board housing 213 (circuit board accommodating portion), a convex portion 300 that protrudes from the partition wall portion 330 , a connecting portion 310 , and a board cover 241 . The housing 210 is a housing body having a motor housing 211, a pump housing 212, a substrate housing 213, and the like. In this embodiment, the motor housing 211, the pump housing 212, the circuit board housing 213, the partition wall 330, and the projection 300 are part of a single member. is.

A motor housing 211, which is a motor accommodating portion, is located on the rear side (−X side) of the housing 210. As shown in FIG. The motor housing 211 has a cylindrical shape extending in the axial direction. The motor housing 211 has a first housing recess 211a which is a recess opening to the rear side. The first housing recess 211a is closed from the rear side by a bearing holder 226, which will be described later.

The pump housing 212 is located on the front side (+X side) of the housing 210 . The pump housing 212 has a second housing recess 212a which is a recess opening to the front side. The electric oil pump 200 has a pump cover 212b that closes the second housing recess 212a from the front side.

A board housing 213, which is a circuit board accommodating portion, is positioned on the side surface of the motor housing 211 (motor accommodating portion) and the pump housing 212 which are aligned in the axial direction. The substrate housing 213 is located below the motor housing 211 and the pump housing 212 (-Z side) in the drawing. The substrate housing 213 has a substantially rectangular shape when viewed from the radially outer side. The substrate housing 213 has a long side in the axial direction and a short side in a direction crossing the axial direction. The substrate housing 213 has a third housing recess 213a that opens toward the lower side of the housing 210 in the drawing.

The housing 210 has a first through hole 210a that axially connects a first housing recess 211a of a motor housing 211 and a second housing recess 212a of a pump housing 212, which are motor housing sections. The housing 210 has a first accommodation recess 211a and a second through hole 210b that radially connects the third accommodation recess 213a of the board housing 213, which is a circuit board accommodation portion. That is, the second through-hole 210b is a housing portion that extends radially between the motor housing 211 and the substrate housing 213 and houses joint bus bars 251a to 251c, which will be described later. The accommodating portion may be a groove that opens in the axial direction and extends in the radial direction.

Motor 220 includes rotor 22 having shaft 21 , stator 23 having windings, busbar assembly 224 , busbar cover 225 , bearing holder 226 , first bearing 27 and second bearing 28 . A front end of the shaft 21 is connected to a pump mechanism 30 .

The stator 23 of the motor 220 is assembled to the housing 210 from the rear side (−X side) of the housing 210 by, for example, shrink fitting, press fitting, or insertion. Shrink fitting is easy to assemble, and since the housing 210 holds the stator 23 over the entire outer circumference after assembly, the holding property is good. That is, the motor housing 211, which is the motor accommodating portion of the housing 210, and the stator 23 are in contact with each other.

When assembling by insertion (clearance fit), a through hole is provided on the radially outer side of the stator 23 and a screw hole is provided in the axial direction of the housing 210, the stator 23 is inserted into the housing 210 (motor housing 211), and bolts are inserted. It may be screwed with In this case, the radial gap between the stator 23 and the housing 210 (motor housing 211) may be filled with the adhesive to increase the radial retention of the stator 23. FIG. That is, the motor housing 211, which is the motor accommodating portion of the housing 210, and the stator 23 are connected via an adhesive.

Further, when assembling by insertion, the stator 23 may be screwed in a state where the stator 23 is moved toward the circuit board 40 side (+Z side) (a state in which the housing 210 is in contact with the motor housing 211) using a jig in advance.

The circuit board 40 is a control board including, for example, a motor drive circuit 451, a control unit 452 for controlling the drive of the motor, a reverse connection prevention circuit 453, and the like. The circuit board 40 also includes a power input section 454 and a motor power output section 455 . The circuit board 40 has a plurality of heat generating components 43 . The board surface of the circuit board 40 has a first surface 411 having the heat generating component 43 and a second surface 412 opposite to the first surface 411 .

In this embodiment, the circuit board 40 has a rectangular plate shape extending in the axial direction. In this embodiment, the circuit board 40 has a rectangular shape with rounded corners, having long sides in the axial direction and short sides in the direction intersecting the axial direction (Y-axis direction). The circuit board 40 is located radially outside the motor 220 and the pump mechanism 30 , and the board surface of the circuit board 40 faces the motor 220 and the pump mechanism 30 . In this embodiment, the circuit board 40 has a power input section 454 at the front end in the axial direction, and a motor power output section 455 at the rear end in the axial direction.

The heat-generating components 43 are, for example, a plurality of transistors 431, a microcomputer 432, and the like. A plurality of transistors 431 form, for example, a motor drive circuit 451 , and a microcomputer 432 controls energization of the motor drive circuit 451 .

The heat generating component 43 is soldered to the first surface 411 of the circuit board 40, for example. The heat-generating component 43 has a metal surface 434 made of a metal plate soldered to the first surface 411 of the circuit board 40 and a resin surface 435 not soldered to the first surface 411 of the circuit board 40 . When the metal surface 434 of the heat-generating component 43 is soldered facing the first surface 411 of the circuit board 40 , the resin surface 435 opposite to the metal surface 434 faces the same direction as the first surface 411 of the circuit board 40 . turn to

The circuit board 40 has a board through-hole 413 that penetrates from the first surface 411 to the second surface 412 opposite to the first surface 411 ( through-hole). The substrate through-hole 413 has a copper foil on the inner surface of the hole and around the opening of the substrate through-hole 413 on the first surface 411 and the second surface 412 . The copper foil is continuous and connected on the first surface 411 side and the second surface 412 side. The open portions of the substrate through holes 413 on the first surface 411 , the inner surface of the substrate through holes 413 , and the open portions of the substrate through holes 413 on the second surface 412 are provided with a continuous copper foil to transfer the heat of the heat-generating component 43 to the first surface 411 . can be transmitted from to the second surface 412 . With this configuration, the circuit board 40 can radiate the heat of the heat generating component 43 from the first surface 411 side (from the heat generating component 43 itself) and also from the second surface 412 side.

The circuit board 40 is mounted on a board housing 213, which is a circuit board accommodating portion of the housing 210, so that the heat-generating component 43 overlaps a protrusion 300 of the housing 210, which will be described later. The second surface 412 is attached so as to face the convex portion 300 side (motor 220 side). That is, the heat-generating component 43 is arranged so as to overlap with the convex portion 300 . When the first surface 411 faces the convex portion 300 side and is attached, the heat of the heat generating component 43 can be transferred to the convex portion 300 by assembling the heat generating component 43 so that the resin surface 435 is in contact with the convex portion 300 . That is, the heat of the heat-generating component 43 can be radiated to the convex portion 300 .

Further, when the second surface 412 faces the convex portion 300 side and is attached, the circuit board 40 is assembled to the board housing 213 which is the circuit board accommodating portion of the housing 210 so that the heat generating component 43 and the convex portion 300 overlap. Since the heat-generating component 43 and the protrusion 300 overlap each other, the board through-hole 413 in the area where the heat-generating component 43 is soldered is also assembled so as to overlap the protrusion 300 . A heat dissipation member 51 may be sandwiched between the second surface 412 of the circuit board 40 and the projection 300 for assembly.

As shown in FIG. 6, the busbar assembly 224 has three busbars 224a, 224b, 224c and a resin busbar holder 224d that holds the busbars 224a to 224c. The busbar holder 224d has an annular shape when viewed from the axial direction. The three busbars 224a to 224c are screwed to the surface facing the rear side of the busbar holder 224d.

Busbar assembly 224 is located on the rear side of stator 23 . The busbar assembly 224 is inserted into the first housing recess 211a of the motor housing 211 from the rear side.
One end of each of the three bus bars 224a to 224c is connected to a coil wire 23d extending rearward from the coil 23c. The three bus bars 224a-224c extend toward the board housing 213 from the connection position with the coil wire 23d. The other end portions of the three busbars 224a to 224c are arranged at the end portion of the busbar holder 224d on the substrate housing 213 side (lower side in the drawing). The other ends of the three bus bars 224a, 224b, 224c are connected to three joint bus bars 251a, 251b, 251c, which will be described later.

The busbar cover 225 is positioned on the rear side of the busbar assembly 224, as shown in FIG. The busbar cover 225 is inserted into the first housing recess 211a from the rear side. The busbar cover 225 has an annular shape when viewed from the axial direction. The busbar cover 225 covers the busbar assembly 224 from the rear side. A bearing holder 226 is covered from the rear side of the busbar cover 225 . The bearing holder 226 closes the first housing recess 211a from the rear side.

The busbar cover 225 has a stepped portion 225a at the outer peripheral end of the surface facing the rear side. The stepped portion 225a has a surface facing the rear side and a surface facing radially outward. An elastic member 225b made of an O-ring is arranged inside the stepped portion 225a. The elastic member 225b is sandwiched between the bearing holder 226 and the busbar cover 225 in the axial direction. The bearing holder 226 pushes the busbar cover 225 to the front side via the elastic member 225b.

Busbar cover 225 functions as a spacer inserted between busbar assembly 224 and bearing holder 226 . The busbar cover 225 pushes the busbar assembly 224 frontward by being pushed frontward by the elastic member 225b. With this configuration, the busbar cover 225 fixes the busbar assembly 224 in the axial direction. Busbar cover 225 and busbar assembly 224 may be part of a single member.

The bearing holder 226 is a disk-shaped member that covers the busbar cover 225 from the rear side. The bearing holder 226 has a cylindrical portion 226a extending along the central axis J and a holder body 226b extending radially outward from the outer peripheral surface of the cylindrical portion 226a. The cylindrical portion 226a is open on both sides in the axial direction. The first bearing 27 is inserted into the opening on the front side of the cylindrical portion 226a. The first bearing 27 is supported from the rear side by a bearing support surface 226c located inside the cylindrical portion 226a.

The bearing holder 226 extends to the outside of the busbar cover 225 in the radial direction. The bearing holder 226 is screwed to the housing 210 on the radially outer side of the busbar cover 225 . The breather 26b is inserted into the rear end of the cylindrical portion 226a.

The second bearing 28 is inserted from the rear side into the first through hole 210a that connects the first accommodation recess 211a and the second accommodation recess 212a. Inside the first through hole 210a, the oil seal 15, the fixing ring 16, the wave washer 17, and the second bearing 28 are arranged in this order from the front side.

The shaft 21 is passed through the inner holes of the second bearing 28 , the wave washer 17 , the fixing ring 16 and the oil seal 15 . A pump mechanism 30 is connected to the front end of the shaft 21 .

Bus bar unit 250 connects motor 220 and circuit board 40 . The busbar unit 250 is connected to the rear end of the circuit board 40 . The busbar unit 250 is housed inside the second through hole 210b that connects the third housing recess 213a and the first housing recess 211a. Also, without using the bus bar unit 250, the motor 220 and the circuit board 40 may be directly connected by the three bus bars 224a to 224c. For example, the three busbars 224a to 224c and a member that serves as a fixture may be integrally molded with resin and screwed to the housing 210 at the fixing points of the fixture. At this time, one end of the three busbars 224a to 224c is connected to the coil wire 23d, and the other end of the three busbars 224a to 224c passes through the second through-hole 210b to the circuit board 40. should be connected to With such a configuration, the busbar holder 224d does not need to be annular when viewed from the axial direction. 224d to separate the housing 210 from the busbars 224a-224c.

One end of joint busbars 251 a - 251 c extends from joint busbar holder 252 toward motor 220 . The other ends of joint busbars 251 a to 251 c extend from joint busbar holder 252 toward circuit board 40 .

The other ends of the three joint bus bars 251a to 251c pass through the circuit board 40 in the thickness direction. The other ends of the three joint bus bars 251a to 251c are soldered to the wiring pattern on the circuit board 40. As shown in FIG. Similarly, even when the motor 220 and the circuit board 40 are directly connected by the three bus bars 224a to 224c without using the three joint bus bars 251a to 251c, the other of the three bus bars 224a to 224c may pass through the circuit board 40 in the thickness direction and be soldered to the wiring pattern on the circuit board 40 .

The housing 210 further has a plate-shaped mounting plate portion 70 for mounting the electric oil pump 200 to an object to which the electric oil pump 200 is mounted, such as an automobile oil pan. The mounting plate portion 70 has a mounting surface 71 that spreads in the axial direction, and the electric oil pump 200 is fixed to the mounting body by a fixing member while the mounting surface 71 is in contact with the mounting body. That is, the housing 210 has an attachment surface 71 that spreads in the axial direction and contacts the attached body. The housing 210 also includes a mounting plate portion 70 extending in the axial direction and having a mounting surface 71 . The mounting surface 71 does not need to extend continuously along the entire axial direction of the mounting plate portion 70, and may be divided into a plurality of portions. Bolts, press-fit pins, rivets, and the like, for example, can be used as fixing members. In this embodiment, a bolt is adopted as the fixing member in consideration of ease of disassembly.

The mounting plate portion 70 is located on the side surface of the motor housing 211 (motor accommodating portion) and the pump housing 212 which are aligned in the axial direction. The mounting plate portion 70 is positioned radially outside the motor housing 211 and the pump housing 212 which are axially aligned. Mounting plate portion 70 has a thickness in a direction away from motor housing 211 and pump housing 212 . A mounting surface 71 of the mounting plate portion 70 is farthest in the +Y-axis direction through the thickness of the mounting plate portion 70 from the motor 220 and the pump mechanism 30 side (center axis J side). The mounting surface 71 is not limited to the +Y-axis direction through the thickness of the mounting plate portion 70 from the side of the motor 220 and the pump mechanism 30 (the side of the central axis J). For example, the mounting surface 71 may be provided on the mounting plate portion 70 in the −Y-axis direction (see FIG. 2) on the side of the motor 220 and the pump mechanism 30 (the side of the central axis J). By arranging the mounting surface 71 in contact with the object to be mounted on the side of the central axis J, the electric oil pump 200 can be mounted to the object to be mounted in such a state that the mounting plate portion 70 is arranged outside the electric oil pump 200. The mounting plate portion 70 can serve to protect the motor and pump mechanism from adverse external influences. By providing a columnar boss or the like from the mounting body, the mounting plate portion 70 can be mounted to the mounting body even if the mounting surface 71 is on the -Y axis direction, which is the central axis J side.

The mounting plate portion 70 is positioned such that the mounting surface 71 and the plate surfaces 411 and 412 of the circuit board 40 intersect each other. In other words, the mounting plate portion 70 and the mounting surface 71, and the plate surfaces (411 or 412) of the substrate housing 213 and the circuit substrate 40, which are the circuit substrate accommodating portions, are located on the side surfaces of the motor housing 211 and the pump housing 212 which are aligned in the axial direction. The mounting plate portion 70 and the mounting surface 71 and the plate surfaces of the board housing 213 and the circuit board 40 are in a positional relationship in which they intersect each other. Therefore, the extended surface of the mounting surface 71 and the extended surface of the plate surface of the circuit board 40 intersect. In this embodiment, as shown in FIGS. 10 and 2, the mounting plate portion 70 extends in the +Z direction, and the circuit board 40 extends in the -Y direction. When the mounting surface 71 and the plate surface (411 or 412) of the circuit board 40 mutually or one of them virtually extends, they abut each other in the Z and Y directions, forming corners in the Z and Y directions. The motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are corners formed by the attachment surface 71 and the plate surface (411 or 412) of the circuit board 40, or by virtually extending one of them. is located on the interior angle β side of In other words, the motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are located on the inner corner side of the intersection between the third surface obtained by virtually extending the mounting surface 71 and the fourth surface obtained by virtually extending the board surface of the circuit board 40. ) is located. Alternatively, the inner corner side of the corner where the board surface of the circuit board 40 intersects with the third plane obtained by virtually extending the mounting surface 71, or the inner corner side of the corner where the mounting surface 71 and the fourth surface obtained by virtually extending the board surface of the circuit board 40 intersect. The motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are located at the .

With this configuration, compared to the case where the mounting plate portion 70 , the motor 220 and the pump mechanism 30 , and the circuit board 40 are arranged in this order in the direction away from the mounting surface 71 along the mounting surface 71 , the size can be reduced in the radial direction. In addition, the circuit board 40 can be made smaller than when the board surface is arranged in the direction intersecting the axial direction. For example, in a configuration in which the board surface of the circuit board 40, which is a control board, is arranged in a direction intersecting the axial direction, the long side of the circuit board 40 may be longer than the radial direction of the motor 220 and the pump mechanism 30. It cannot be made smaller in the direction. If the size cannot be reduced in the radial direction, the electric oil pump 200 attached to an oil pan or the like of an automobile may interfere with a nearby member related to the transmission or body of the automobile.

In this embodiment, the circuit board 40 has a power input section 454 at the front end in the axial direction, and a motor power output section 455 at the rear end in the axial direction. The power input to the power input unit 454 arranged at the end of the circuit board 40 on the front side in the axial direction passes through the board wiring pattern provided on the circuit board 40 and is supplied to the rear side of the circuit board 40 in the axial direction. It is output from the motor power supply output section 455 arranged at the end. That is, the power is input to the board wiring pattern at the front end of the circuit board 40 in the axial direction, and then output from the rear end of the circuit board 40 in the axial direction toward the busbar of the motor 220 . In such a configuration, it is possible to employ the following board wiring pattern for the circuit board 40 . That is, for the flow of the power input to the power input unit 454 in the circuit board 40, in the process up to the motor power output unit 455, it is necessary to provide a route that reverses from the rear side to the front side in the axial direction. Alternatively, it is a board wiring pattern that minimizes the route. Therefore, according to the electric oil pump 200, the total extension of the board wiring pattern can be shortened compared to the configuration in which the motor power supply output part 455 is arranged at a position different from the end part of the circuit board 40 on the rear side in the axial direction. The circuit board 40 can be miniaturized (reduced area). Since no route is provided that reverses from the rear side to the front side in the axial direction, no board wiring pattern is required in the short side direction (Y-axis direction) of the circuit board 40 . The short side direction) can be made smaller, and the electric oil pump 200 as a whole can be made smaller in the radial direction. By arranging the long side of the circuit board 40 in the axial direction and arranging it on the side surface of the motor 220 and the pump mechanism 30 which are aligned in the axial direction, the electric oil pump 200 can be made radially compact.

When the axial direction is viewed horizontally from the mounting surface 71 side of the mounting plate portion 70, the mounting plate portion 70 is smaller than the motor housing 211 and the pump housing 212 in the direction (Z direction) intersecting the axial direction. With this configuration, the mounting plate portion 70 does not protrude outside the outer shapes of the motor housing 211 and the pump housing 212, so that the electric oil pump 200 can be made compact in the radial direction.

The mounting plate portion 70 has at least two mounting holes 721 , 722 , which are located axially outside the pump housing 212 and axially outside the motor housing 211 . Also, the mounting holes 721 , 722 are in the Z direction between the board housing 213 and the motor housing 211 and the pump housing 212 . With this configuration, since the mounting holes 721 and 722 do not protrude radially outward, the size can be reduced in the radial direction.

The mounting plate portion 70 supplies fluid sucked and discharged by the pump mechanism 30 in an axial range from the front side mounting hole 721 (first mounting hole 721) to the rear side mounting hole 722 (second mounting hole 722). It has a suction port 731 for suction, a discharge port 734 for discharging, and a channel 73 through which fluid flows. With this configuration, the mounting plate portion 70 has the suction port 731, the discharge port 734, and the flow path 73, so that the mounting plate portion 70 has the suction port 731, the discharge port 734, the flow path 73, and the like. It can be made smaller than when there is a structure.

A suction port 731 and a discharge port 734 are provided in the axial range from the first mounting hole 721 to the second mounting hole 722 of the mounting plate portion 70 . In this configuration, an inlet port 731 and an inlet port 731 are provided in the axial range between the first mounting hole 721 and the second mounting hole 722 , which are axially outward of the motor housing 211 and axially outward of the pump housing 212 . , and a discharge port 734, the suction port 731 and the discharge port 734 are not located axially outside the mounting holes 721 and 722, so that the size is reduced in the axial direction.

The mounting plate portion 70 further has a front side mounting hole 723 (third mounting hole 723). When the mounting surface 71 is viewed from the front, the third mounting hole 723 is displaced from the first mounting hole 721 in the radial direction of the central axis J (Z direction). Since the mounting plate portion 70 further has the third mounting hole 723, the fixing to the mounting body is improved, and the fixing of the electric oil pump 200 is stabilized. Since the fixation of the electric oil pump 200 is improved and stabilized by fixing the three points of the first to third mounting holes, the fixation of the suction port 731 and the discharge port 734 to the mounting body is improved and stabilized. A suction port 731 and a discharge port 734 are provided in the radial direction (Z direction) range from the first mounting hole 721 to the third mounting hole 723 of the mounting plate portion 70 . In this configuration, there is a mounting plate 70 between the substrate housing 213 and the motor housing 211 and the pump housing 212 in the Z direction. Since the intake port 731 and the discharge port 734 are provided in the range of the direction), the size is reduced in the radial direction compared to the case where the suction port 731 and the discharge port 734 are radially outside the mounting holes 721 and 723. can. In addition, since the suction port 731 and the discharge port 734 do not protrude in the Z direction compared to the external shape of the mounting plate portion 70, the size is small.

When viewed from the mounting surface 71 side (viewed from the + side to the - side in the Y direction), the suction port 731 and the discharge port 734 are axially displaced from each other. In this embodiment, the suction port 731 is located on the rear side in the axial direction of the discharge port 734 . Furthermore, when viewed with the + side in the Z direction facing upward, the suction port 731 is positioned below the discharge port 734 in the Z direction. With this configuration, the suction port 731 and the discharge port 734 are located at the same axial location, and compared to the case where the suction port 731 and the discharge port 734 are arranged in order from the bottom in the Z direction, the size can be reduced in the radial direction. It is possible.

In this embodiment, the mounting surface 71 does not need to be continuous over the entire mounting plate portion 70 and may be configured partially. The mounting surface 71 may be provided only at a portion in contact with the object to be mounted. The mounting surface 71 may be configured only around the first mounting hole 721 to the third mounting hole 723 , the suction port 731 and the discharge port 724 , for example. The mounting surface 71 may also be around the positioning point.

The mounting surface 71 may have an inlet face portion 715 around the inlet port 731 and an outlet face portion 716 around the outlet port 734 . By arranging the suction port 731 and the suction port surface portion 715 and the discharge port 734 and the discharge port surface portion 716 so as to be offset in the axial direction, the suction port 731 and the suction port surface portion 715 are aligned in the Z direction at the same position in the axial direction. , the size can be further reduced in the radial direction as compared with the case where the ejection port 734 and the ejection port surface portion 716 are arranged.

The channel 73 has a suction side channel 732 and a discharge side channel 733 . The suction side flow path 732 includes, for example, a first suction flow path 7321 extending from the suction port 731 toward the pump mechanism 30 in a direction intersecting the axial direction, and extending from the pump mechanism 30 side and the pump housing 212 toward the mounting plate portion 70 side. It has a third intake channel 7323 and a second intake channel 7322 connected to the first intake channel 7321 and the third intake channel 7323 . Further, for example, the discharge-side channel 733 has a first discharge channel 7331 extending from the pump mechanism 30 side and the pump housing 212 toward the mounting plate portion 70 side. The number of discharge-side flow paths 733 may be one or more than two. In the case of this embodiment, the flow path 73 has a relief flow path 735 branched from the first discharge flow path 7331 and connected to the first suction flow path 7321 at a position away from the second suction flow path 7322 side. The relief channel 735 is a channel for the fluid discharged by the pump mechanism 30 to flow back to the suction side channel 732 side. In this embodiment, the relief channel 735 has a channel along the axial direction and a channel facing in a direction intersecting the axial direction. In the present embodiment, the third intake channel 7323 is the final intake channel connected to the pump mechanism 30 and the pump housing 212 in the channel (path) to the pump mechanism 30 with the intake port 731 as a reference. The final intake channel is not limited to the third intake channel 7323 .

The third suction flow path 7323 (final suction flow path 7323) and the first discharge flow path 7331 communicate with the mounting plate portion 70 and the pump housing 212 along their respective flow paths. In this embodiment, the final suction channel 7323 and the first discharge channel 7331 are connected in a straight line from the mounting plate portion 70 to the pump housing 212 . The final suction flow path 7323 and the first discharge flow path 7331 are formed from the mounting surface 71 side by, for example, mold molding or cutting. Since the final suction flow path 7323 connected to the pump housing 212 and the first discharge flow path 7331 are straight, the resistance when the pump mechanism 30 sucks and discharges fluid can be suppressed, and deterioration of performance as a pump can be suppressed. Further, since the final suction flow path 7323 connected to the pump housing 212 and the first discharge flow path 7331 are straight, the housing 210 can be easily manufactured.

The third suction flow path 7323 is produced by machining from the mounting surface 71 side of the mounting plate portion 70 with a drill or the like. At this time, in order to seal the connection between the third suction passage 7323 and the outside, the opening of the mounting plate portion 70 is fitted with a lid member or a cap member by press fitting or screw fitting.

The third intake flow path 7323 is positioned axially frontward of the intake port 731 and the mounting surface (intake port surface portion) 715 around the intake port and below the discharge port 734 in the Z direction. With this configuration, the mounting surface is provided on the axial front side of the suction port 731 and the mounting surface (suction port surface portion) 715 around the suction port of the mounting plate portion 70 and on the Z direction lower side than the discharge port 734 . Since the third suction flow path 7323 (final suction flow path 7323) that is not required can be arranged, the discharge port 734 and the third suction flow path 7323 (final suction flow path 7323) are arranged at locations close to each other in the axial direction. Even so, the size of the mounting plate portion 70 can be reduced in the Z direction. That is, the size can be reduced in the radial direction. Further, as described above, since the third suction flow path 7323 (final suction flow path 7323) and the first discharge flow path 7331 are connected in a straight line to the pump housing 212, the pump housing 212 has a complicated shape. is not necessary, and pump housing 212 and housing 210 can be made smaller axially and radially. The third intake channel 7323 (final intake channel 7323 ) does not need to be at exactly the same axial location as the outlet 734 , and may be axially offset from the center of the outlet 734 . The location of the third suction flow path 7323 (final suction flow path 7323) may be appropriately adjusted in consideration of the structure inside the housing 210 or the performance of the pump mechanism 30. FIG.

In this embodiment, the second suction flow path 7322 and the relief flow path 735 extend along the axial direction and are displaced from the substrate housing 213 side toward the motor housing 211 and the pump housing 212 side (in the Z direction), They are arranged so as to at least partially overlap each other in the radial direction (Y direction). With such a configuration, the size can be reduced in the radial direction. That is, since the second suction flow path 7322 and the relief flow path 735 provided in the mounting plate portion 70 overlap in the Z direction, the thickness of the mounting plate portion 70 in the Y direction can be reduced, so that the size can be reduced in the radial direction. . Since the thickness of the mounting plate portion 70 can be reduced so as to reduce the thickness, the length from the mounted body to the outer shape of the electric oil pump 200 can be shortened. Interference with members that may exist around the pump 200 can be suppressed. Moreover, since the thickness of the mounting plate portion 70 can be reduced, the distance by which the electric oil pump 200 protrudes from the mounting body in the direction perpendicular to the mounting surface 71 is shortened. Since the projection distance of the electric oil pump 200 is short, the moment associated with the projection distance and the weight of the electric oil pump 200 is small. It is possible to reduce the influence of vibration on electric oil pump 200 .

In this embodiment, the electric oil pump 200 has a connector portion 2135 axially extending from the front side of the board housing 213 . Connector portion 2135 is a portion that connects electric oil pump 200 to the outside. As shown in FIGS. 4 and 6, the connector portion 2135 has a terminal connected to the power input portion 454 (not shown) at the axial front end portion of the circuit board 40 . The points for receiving the external connections of the connector portion 2135 are between the board housing 213 and the motor housing 211 and the pump housing 212 . That is, the connector portion 2135 is located between the substrate 213 and the motor housing 211 and the pump housing 212 in the Z direction. With this configuration, compared to the case where the connector portion 2135 is arranged away from the substrate housing 213 to the motor housing 211 and the pump housing 212 in the Z direction, the size can be reduced in the radial direction.

The housing 210 has a partition wall portion 330 between a motor housing 211 that is a motor accommodating portion and a board housing 213 that is a circuit board accommodating portion. The partition wall 330 separates the motor housing 211 and the substrate housing 213 and is in contact with the outer circumference of the stator 23 of the motor 220 . The partition wall portion 330 has a thickness in the direction away from the stator 23, and the opposite surface in contact with the stator 23 is inside the substrate housing. The partition wall 330 extends from the stator 23 toward the pump housing 212 . The partition wall 330 does not partially extend on the rear side and forms a region of the second through hole 210b that connects the third accommodation recess 213a and the first accommodation recess 211a. The partition wall portion 330 has an arc-shaped cross section along the stator 23 when viewed from the axial direction.

The housing 210 has a projection 300 projecting from the partition wall 330 toward the circuit board 40 . The convex portion 300 is positioned so as to radially overlap between the stator 23 of the motor 220 and the heat-generating component 43 of the circuit board 40 .

When assembled with the second surface 412 of the circuit board 40 facing the convex portion 300 side, the stator 23 of the motor 220 and the convex portion 300 (including the partition wall portion 330) are arranged in order radially outward from the central axis J. , the heat radiating member 51, the circuit board 40, and the heat generating component 43 in this order.

The convex portion 300 has, for example, a pedestal shape, and is substantially rectangular when viewed from the opening side (−Z direction) of the substrate housing 213 . The end of the projection 300 on the circuit board 40 side has a planar shape along the second surface 412 of the circuit board 40 .

The convex portion 300 has a first convex portion 301 that protrudes on the rear side of the motor 220 and a second convex portion 302 that protrudes on the front side of the motor 220 . The first convex portion 301 and the second convex portion 302 are aligned in the axial direction and arranged within a range in the axial direction of the motor. For example, the first convex portion 301 is positioned on the rear side of the motor 220 so as to overlap the motor 220 and the transistor 431, which is a heat-generating component. For example, the second convex portion 302 is positioned on the front side of the motor 220 so as to overlap the motor 220 and the microcomputer 432, which is a heat-generating component.

The first convex portion 301 has, for example, a rectangular shape with long sides in the axial direction and a shape extending along the axial direction. The second convex portion 302 is, for example, approximately square.

A board housing 213 , which is a circuit board accommodating portion of the housing 210 , has a wall part 320 covering the periphery of the circuit board 40 . The wall portion 320 has a surface in a direction intersecting with the board surface of the circuit board 40 or in a direction along the board surface. Walls 321 and 322 intersecting the board surface of the circuit board 40 stand in the -Z direction so as to go around the thickness of the circuit board 40 . The wall portion 323 along the plate surface of the circuit board 40 extends axially to the front side so as to face the plate surface, for example. The outside of wall portion 320 is the outside of electric oil pump 200, and the wall portion seen from the outside has an outer surface. That is, the wall portion 320 faces the inside of the board housing 213 which is the circuit board accommodation portion and the outside of the electric oil pump 200 .

The wall portion 320 of the substrate housing 213 has two wall portions 321 having surfaces along the axial direction and two wall portions 322 intersecting the axial direction.

A wall portion 320 of the substrate housing 213 has a wall portion 322 connected to a corner (end portion) of a wall portion 321 having a surface along the axial direction. The wall portion 320 of the substrate housing 213 has a wall portion 321 connected to the corner (end portion) of the wall portion 322 intersecting the axial direction and the corner (end portion).

(There is a third convex part)
The convex portion 300 has a third convex portion 303 between the first convex portion 301 and the wall portion 320 . The third convex portion 303 is positioned, for example, in a direction (Y-axis direction) intersecting the axial direction from the first convex portion 301 . The third convex portion 303 is between the first convex portion 301 and the wall portion 320 and protrudes from the partition wall portion 330 . Like the first protrusion 301, the third protrusion 303 has a trapezoidal shape and is substantially rectangular when viewed from the opening side (-Z direction) of the substrate housing 213. As shown in FIG. When the height of the projection 300 is the direction from the partition wall 330 to the circuit board 40 side (−Z direction) of the projection 300, the end of the third projection 303 on the circuit board 40 side is, for example, the first It is positioned at the same height as the end of the projection 301 on the circuit board 40 side.

The partition wall portion 330 has an arc shape centered on the central axis J in a cross section viewed from the axial direction. In a cross section viewed from the axial direction, the outer side (wall side) of the partition wall becomes lower in the height direction of the convex portion 300 as it is closer to the wall portion 330 . In this embodiment, the first protrusion 301 protrudes from the center of the partition wall 330 in a cross section viewed from the axial direction, and the third protrusion 301 protrudes from the first protrusion 301 of the partition wall 330 in the cross section viewed from the axial direction. It protrudes from between it and the wall portion 320 . With this configuration, the height of the third protrusion 303 is higher than the height of the first protrusion 301 . Since the first convex portion 301 and the third convex portion 303 have the same external shape, the third convex portion 303 is taller than the first convex portion 301 and has a larger volume.

In this embodiment, the first convex portion 301 is positioned at the center of the partition wall portion 330 in the cross section viewed from the axial direction. In addition, the third protrusions 303 are positioned one each on the left side and the right side of the first protrusions 301 in the cross section viewed from the axial direction. The first convex portion 301 and the third convex portion 303 each have a substantially rectangular shape when viewed from the opening side (-Z direction) of the substrate housing 213, and have the same axial length.

The convex portion 300 further has a fourth convex portion 304 that protrudes from the wall portion 323 on the front side. The fourth convex portion 304 overlaps the pump mechanism 30 in the radial direction when viewed from the opening side (−Z direction) of the substrate housing 213 . With this configuration, the heat transferred to the fourth protrusion 304 can be transferred to the fluid sucked and discharged by the pump mechanism 30 . Therefore, the heat of the heat-generating component 43 (the transistor 431 used in the circuit 453 for preventing reverse connection) transmitted to the third connecting portion 313 can be radiated to the fluid.

(There is a connection part)
The housing 210 has a connecting portion 310 that connects the convex portion 300 and the wall portion 320 . The connecting portion 310 connects the convex portion 300 and the wall portion 320 . In the present embodiment, the connecting portion 310 has a plate-like shape that protrudes from the partition wall portion 330 toward the circuit board 40 and has a surface in a direction intersecting with or along the axial direction. The connection portion 310 does not have to be connected to the partition wall portion 330 .

(First connecting part)
The connecting portion 310 has a first connecting portion 311 extending in the axial direction and a second connecting portion 312 extending in a direction intersecting the axial direction. In this embodiment, the first connecting portion 311 extends axially from the front side of the first convex portion 301 and connects the first convex portion 301 and the fourth convex portion 304 . A second protrusion 302 is positioned between the first protrusion 301 and the fourth protrusion 304 of the first connecting portion 311 . The second convex portion 302 is connected to the first convex portion 301 and the fourth convex portion 304 by the first connecting portion 311 .

(Second connection part)
In the present embodiment, the second connecting portion 312 extends from the first convex portion 301 in a direction intersecting the axial direction (Y-axis direction), and connects the first convex portion 301 and a wall portion 321 having a surface along the axial direction. connect. A third projection 303 is positioned between the first projection 301 and the wall portion 321 having a surface along the axial direction of the second connecting portion 312 . The third convex portion 303 is connected to the first convex portion 301 and the wall portion 321 having a surface along the axial direction by the second connecting portion 312 . The second connecting portion 312 linearly connects the first convex portion 301 and the third convex portion 303 from one wall portion 321 to the other wall portion 321 in a direction intersecting the axial direction (Y-axis direction).

The connecting portion 310 further includes a third connecting portion 313 extending from the first connecting portion 311 along a direction intersecting the axial direction and connecting with the wall portion 320, and a third connecting portion 313 extending along the axial direction from the second connecting portion 312 and extending along the wall. and a fourth connecting portion 314 that connects with the portion 320 .

The third connecting portion 313 extends along a direction intersecting the axial direction, and connects the first connecting portion 311 and the wall portion 321 having a surface along the axial direction. The third connecting portion 313 linearly connects from one side of the wall portion 321 having a surface along the axial direction to the other side. The third connecting portion 313 has a stepped shape whose height changes when the direction from the partition wall portion 330 to the circuit board 40 side (−Z direction) is defined as the height when viewed from the axial direction.

The third connecting portion 313 is positioned, for example, on the front side. At least part of the third connecting portion 313 radially overlaps the pump housing 212 when viewed from the opening side (−Z direction) of the substrate housing 213 . The housing 210 has a channel 31 through which fluid sucked and discharged by the pump mechanism 30 flows. At least part of the third connecting portion 313 protrudes from the outer wall of the channel 31 . With this configuration, the heat transmitted to the third connecting portion 313 can be transmitted to the outer wall of the flow path 31 . Since the fluid flows inside the flow path 31 , the heat received by the outer wall of the flow path 31 can be transferred to the fluid flowing inside the flow path 31 . That is, the heat of the heat-generating component 43 and the heat of the motor 220 transmitted to the third connecting portion 313 can be radiated to the fluid.

The fourth connecting portion 314 extends along the axial direction and connects the second connecting portion 312 and the wall portion 322 having a surface intersecting the axial direction. The fourth connecting portion 314 linearly connects from one side of the wall portion 322 having a surface intersecting the axial direction to the other side (from the front side to the rear side). The fourth connecting portion 314 is positioned between the third convex portion 303 and the wall portion 321 having a surface along the axial direction, and extends linearly on the front side and the rear side in the axial direction. A portion of the fourth connecting portion 314 is also connected to a wall portion 321 (323) having a surface along the axial direction on the front side of the board housing 213 .

The connecting portion 310 further has a fifth connecting portion 315 that connects the second convex portion 302 and the wall portion 321 having a surface along the axial direction. The fifth connecting portion 315 extends from the second convex portion 302 in a direction intersecting the axial direction (Y-axis direction) and connects to one side and the other side of the wall portion 321 having a surface along the axial direction.

In this embodiment, a board housing 213 that is a circuit board accommodating portion of the housing 210
has a long side (first long side) in the axial direction and a short side (first short side) in a direction intersecting the axial direction (Y-axis direction). It looks roughly rectangular. The circuit board 40 has a long side (second long side) in the axial direction and a short side (second short side) in a direction intersecting the axial direction (Y-axis direction), and has a rectangular plate shape. The circuit board 40 enters the board housing 213 through the opening of the board housing 213 and is fixed by screws 2134 from the opening side of the board housing 213 to the side of the motor 220 , the pump mechanism 30 and the partition wall 330 . The board housing 213 has screw holes 2133 for fastening screws 2134 for fixing the circuit board 40 . In this embodiment, the screw hole 2133 of the substrate housing 213 is formed in a tubular portion 2132 protruding from the partition wall portion 330 toward the opening side of the substrate housing 213 .

In the present embodiment, the first connecting portion 311 to the fifth connecting portion 315 are lattice-shaped when viewed from the opening side of the substrate housing 213 in the +Z direction. As shown in FIG. 7, when the axial direction is vertical, the first connecting portion 311 extends along the axial direction in the vicinity of the center of the board housing 213 which is the circuit board accommodating portion, and overlaps with the motor 220. 301 , the second protrusion 302 , and the fifth protrusion 305 overlapping the pump mechanism 30 . The fourth connecting portion 314 extends along the axial direction between the third convex portion 303 and the wall portion 320 and connects one side of the wall portion 322 to the other side of the wall portion 322 having a surface intersecting the axial direction. A second connecting portion 312, a third connecting portion 313, and a fifth connecting portion 315 intersect one first connecting portion 311 and two fourth connecting portions 314 extending in the axial direction, One side of the wall portion 321 having a surface along the axial direction is connected to the other side. The second connecting portion 312 has a shorter distance from the first convex portion 301 and the second convex portion 302 to the wall portion 320 of the first connecting portion 311 and the second connecting portion 312 .

The cylindrical portion 2132 is provided at the wall portion 320, or in the middle of the first connecting portion 311 to the fifth connecting portion 315, or at the place where any one of the first connecting portion 311 to the fifth connecting portion 315 crosses each other.

<effect>
The convex portion 300 of the housing 210 overlaps the motor 220 and the heat generating component 43 of the circuit board 40 as follows. That is, when the second surface 412 of the circuit board 40 is assembled to the board housing 213 facing the motor 220 and the pump mechanism 30, the motor 220, the convex portion 300, and the heat dissipation member are arranged radially outward from the central axis J in this order. 51, the circuit board 40, and the heat-generating component 43 are in contact with each other in this order. In addition, the motor 220, the convex portion 300, and the heat-generating component 43 overlap in the radial direction (outward in the radial direction from the central axis J) when viewed from a cross section along the axial direction. Furthermore, the motor 220, the convex portion 300, and the heat-generating component 43 overlap in the radial direction (outward in the radial direction from the central axis J) when viewed from a cross section perpendicular to the axial direction. The motor 220, the convex portion 300, and the heat-generating component 43 do not need to overlap each other in their center portions, regardless of whether they are viewed from a cross section along the axial direction or from a cross section perpendicular to the axial direction. Even if you want the parts to match, at least a part of them should overlap. With such a configuration, the heat of the heat-generating component 43 and the heat of the motor 220 can be received by the convex portion 300 and the heat of the heat-generating component 43 and the motor 220 can be radiated. The convex portion 300 that has received heat can radiate heat outward from the side surface that is not in contact with the heat-generating component 43 . Since the convex portion 300 dissipates not only the heat of the heat-generating component 43 but also the heat of the motor 220, the heat dissipation is excellent. Since the heat dissipation is excellent, the time for which the motor 220 operates in a state of high output, for example, can be extended. Further, it is possible to perform high-output operation without increasing the size of the motor 220 . If the heat radiation is not excellent, for example, the heat-generating component 43 and the motor 220 may reach the upper limit temperature of specifications and break.

The circuit board 40 may also be assembled to the board housing 213 with the first surface 411 facing the motor 220 and the pump mechanism 30 . In this case, the motor 220 , the convex portion 300 , and the heat-generating component 43 are in contact with each other in this order radially outward from the central axis J in a cross section viewed from the axial direction. The convex portion 300 is in contact with the resin surface 435 of the heat-generating component 43 facing in the same direction as the first surface of the circuit board 40 . Furthermore, a heat radiating member 51 may be interposed between the convex portion 300 and the heat generating component 43 .

The material of the housing 210 may be metal or resin. When the housing 210 is made of metal, for example, a heat radiating member 51 whose base material is silicone is used, and this heat radiating member 51 is sandwiched between the second surface 412 of the circuit board 40 and the convex portion 300 of the housing 210. Circuit board 40 and housing 210 can be insulated. When the housing 210 is made of resin, it does not need to consist of one member, and may be integrally formed with a metal member as appropriate. The motor housing 211 and the substrate housing 213 may be made of resin, and the pump housing 212 may be made of metal, and the housing 210 may be integrally formed. Alternatively, only the convex portion 300 may be made of metal or resin.

The housing 210 has a connecting portion 310 that connects the convex portion 300 and the wall portion 320 . Due to the presence of the connecting portion 310 , the heat received by the convex portion 300 from the heat-generating component 43 and the motor 220 can be radiated to the wall portion 320 via the connecting portion 310 . Since the wall portion 320 has an outer surface facing the outside of the housing 210, the heat transmitted from the connecting portion 310 can be radiated to the outside of the outer surface. That is, the heat generated by the heat-generating component 43 and the motor 220 can be radiated from the electric oil pump 200 to the outside. The outside of the housing 210 (electric oil pump 200) varies depending on the mounting environment, such as a mating member such as an attached body, external air (air, gas, etc.), oil (cooling oil, lubricating oil, grease), and other fluids. . The heat transmitted to the wall portion 320 can be radiated to a mating member, the outside air, oil, or other fluids, and the heat generated by the heat-generating component 43 and the motor 220 can be radiated from the electric oil pump 200 .

The housing 210 has a partition wall portion 330 that separates the motor housing 211, which is a motor housing portion, and the board housing 213, which is a circuit board housing portion. Partition wall 330 is in contact with the outer circumference of stator 23 of motor 220 . The partition wall 330 is in contact with the motor 220 over the entire axial direction. By axially connecting the convex portion 300 projecting from the partition wall portion 330 and the connecting portion 310, the heat of the motor 220 can be received in the entire axial direction of the motor 220, resulting in excellent heat dissipation.

The connecting portion 310 has a first connecting portion 311 extending axially from the convex portion 300 and a second connecting portion 312 extending from the convex portion 300 in a direction crossing the axial direction. With this configuration, heat can be transferred to multiple locations on the wall portion 320 . Since heat can be transferred to a plurality of locations on the wall portion 320, heat dissipation is excellent. In addition, by overlapping the motor 220 with the first connecting portion 311 extending in the axial direction, the heat of the motor 220 can be dissipated not only to the convex portion 300 but also to the first connecting portion 311, so that the heat can be further dissipated. Furthermore, by overlapping the second connecting portion 312 with the motor 220, the heat of the motor 220 can be radiated to the second connecting portion 312, and the heat can be further radiated. The first connecting portion 311 extending in the axial direction radiates heat to the wall portion 322 having a surface intersecting the axial direction, and the second connecting portion 312 extending in the direction intersecting the axial direction has a surface along the axial direction. Heat is radiated to the wall portion 321 . Therefore, since the housing 210 has the first connecting portion 311 and the second connecting portion 312, heat can be dissipated through the entire wall portion 320, and heat dissipation is excellent.

The protrusion 300 has a first protrusion 301 protruding from the rear side of the partition wall 330 and a second protrusion 302 protruding from the partition wall 330 on the front side of the first protrusion 301 . The circuit board 40 has a motor power output section 455 at the rear end in the axial direction, and has a motor drive circuit 451 and a control section 452 in order from the motor power output section 455 toward the front side. In the case of this embodiment, the first convex portion 301 receives heat from the transistor 431 that constitutes the motor drive circuit 451 , and the second convex portion 302 receives heat from the microcomputer 432 that controls the energization of the motor drive circuit 451 . Since the plurality of protrusions 300 are provided, the plurality of heat-generating components 43 attached to the circuit board 40 can radiate heat to the first protrusions 301 and the second protrusions 302, respectively, and the heat dissipation is excellent.

Further, as shown in FIG. 5 , the first convex portion 301 and the second convex portion 302 are arranged side by side in the axial direction and overlap the motor 220 . Since not only the first convex portion 301 but also the second convex portion 302 overlap the motor 220, the motor 220 can dissipate heat to the first convex portion 301 and the second convex portion 302, and the heat dissipation is excellent.

The convex portion 300 further has a third convex portion 303 between the first convex portion 301 and the wall portion 320 . As shown in FIG. 8 , the third convex portion 303 protrudes from the partition wall portion 330 . The third convex portion 303 overlaps a part of the transistor 431 forming the motor drive circuit 451 and the motor 220 . By having the third convex portion 303, the heat of the heat-generating component 43 and the heat of the motor 220 can be further dissipated.

Further, the first convex portion 301 protrudes from the center of the partition wall portion 330 in the Y-axis direction toward the opening side of the substrate housing 213, which is the circuit substrate accommodating portion. The third convex portion 303 protrudes from the partition wall portion 330 between the first convex portion 301 and the wall portion 321 having a surface along the axial direction. That is, the third protrusion 303 is shifted in the Y-axis direction from the first protrusion 301 and positioned outside the substrate housing 213 relative to the first protrusion 301 . As shown in FIGS. 8 and 9 , the partition wall 330 has an arc shape, and the outer side of the partition wall 330 in the Y-axis direction becomes lower in the height direction of the projection 300 as it is closer to the wall 320 . A third protrusion 303 that protrudes from the partition wall 330 while being displaced outward in the Y-axis direction from the first protrusion 301 protrudes from a position lower than the first protrusion 301 and is at the same height as the first protrusion 301. Since it has an end on the circuit board 40 side, it has a volume larger than that of the first projection 301 . With this configuration, the volume of the third convex portion 303 can be increased, and the heat of the heat-generating component 43 and the heat of the motor 220 can be more effectively radiated.

The third convex portion 303 is located between the first convex portion 301 and the wall portion 321 having a surface along the axial direction, and is connected to the second connecting portion 312 . Since the third convex portion 303 is connected to the second connecting portion 312, heat received from the heat-generating component 43 and the motor 220 can be radiated to the wall portion 321 having a surface along the axial direction.

The third convex portion 303 is positioned between the first convex portion 301 and a wall portion 321 having a surface along the axial direction. and the wall portion 321 having the . A second connecting portion 312 between the third convex portion 303 and the wall portion 321 having a surface along the axial direction protrudes from the partition wall portion 330 toward the circuit board 40 side. The size of the projection 300 of the second connecting portion in the height direction is greater than between the first projection 301 and the third projection 303 and between the third projection 303 and the wall portion 321 having a surface along the axial direction. is larger. In addition, the distance of the second connecting portion 312 in the Y-axis direction varies from between the first convex portion 301 to the third convex portion 303 to the wall portion 321 having a surface along the axial direction from the third convex portion 303 . between is larger. The heat received by the first convex portion 301 and the third convex portion 303 is transmitted through the second connecting portion 312 and radiated toward the wall portion 321 having a surface along the axial direction. The second connecting portion 312 near the wall portion 321 having the surface along the axial direction, that is, the second connecting portion 312 between the wall portion 321 having the surface along the axial direction from the third convex portion 303 is the first convex portion. Since it is larger than the space between 301 and the third convex portion 303, the surface area is large and the heat dissipation is excellent. In addition, when the second connecting portion 312 is cross-sectioned along the axial direction, the cross-sectional area between the third convex portion 303 and the wall portion 321 having the surface along the axial direction is larger. Since the cross-sectional area is large, heat can be dissipated to the wall portion 321 having a surface along the axial direction.

The connecting portion 310 has a third connecting portion 313 extending from the first connecting portion 311 along a direction crossing the axial direction and connected to a wall portion 321 having a surface along the axial direction. The heat received by the first connecting portion 311 can be received by the third connecting portion 313, and the heat can also be radiated to the wall portion 321 having a surface along the axial direction, so that heat radiation is more excellent.

The connecting portion 310 axially extends from the second connecting portion 312 and has a fourth connecting portion 314 connected to the wall portion 320 . The fourth connecting portion 314 receives the heat received by the second connecting portion 312 and can also dissipate the heat to the wall portion 320, so heat dissipation is more excellent.

The connecting portion 310 further has a fifth connecting portion 315 that connects the second convex portion 302 and the wall portion 321 having a surface along the axial direction. The heat received by the second convex portion 302 can be radiated to the wall portion 321 having a surface along the axial direction by the fifth connecting portion 315 .

A heat dissipation member 51 may be provided at the end on the circuit board 40 side of the projection 300 to receive heat from the heat generating component 43 via the heat dissipation member 51 . Even if the heat-generating component 43 is relatively small with respect to the end portion of the projection 300, by using the heat radiating member 51, the heat can be received by the entire end of the projection 300, and the heat radiation of the heat-generating component 43 can be improved. good. The heat dissipating member 51 may be provided for each convex portion 300, or the first convex portion 301 to the third convex portion 303 concentrated on the rear side may be collectively installed to share one large heat dissipating member 51. . Note that when the second surface 412 of the circuit board 40 is assembled facing the motor 220 side, heat can be transferred from the heat-generating component 43 to the heat-dissipating member 51 via the board through-hole 413 (through-hole) of the circuit board 40 . .

The first connecting portion 311 to the fifth connecting portion 315 may be provided with a stepped shape. By appropriately forming each connecting portion 310 into a stepped shape, heat received from the convex portion 300 can be radiated to the wall portion 320 while avoiding interference with electronic components such as capacitors mounted on the circuit board 40 . It is possible.

The third accommodation recess 213a of the substrate housing 213 may be filled with grease, resin material, or a silicone-based material so as to connect the projection 300 to the wall 320 . By filling grease, resin material, or the like, the heat of heat-generating component 43 and motor 220 can be radiated to the outside from electric oil pump 200 not only through connecting portion 310 but also through the filled grease, resin material, or the like. .

When the circuit board 40 is assembled with the first surface 411 facing the convex portion 300, the stator 23 of the motor 220, the partition wall portion 330, the convex portion 300, and the heat-generating component 43 are arranged radially outward from the central axis J. You can contact them in order. The resin surface 435 of the heat-generating component 43 facing in the same direction as the first surface 411 of the circuit board 40 may come into contact with the convex portion 300 and radiate heat to the convex portion 300 .

The housing 210 is in contact with a pump cover 212b that closes the second accommodation recess 212a from the front side and a bearing holder 226 that closes the first accommodation recess 211a from the rear side. Since the pump cover 212b and the bearing holder 226 are in contact with the housing 210, the heat of the heat-generating component 43 and the motor 220 is transferred from the housing 210 (the convex portion 300 and the connecting portion 310) to the pump cover 212b and the bearing holder 226. , and heat can be dissipated from the outer surfaces of the pump cover 212b and the bearing holder 226 to the outside. By making the pump cover 212b and the bearing holder 226 metal, heat conduction is excellent, and heat dissipation is further excellent. Further, by making the board cover 241, which is a part of the housing 210, also made of metal, heat can be further dissipated. Moreover, the heat received by the projections 300 and the connecting portions 310 of the present embodiment is not only radiated to the outside from the outer surface of the wall portion 320 . In other words, since the substrate housing 213 having the wall portion 320 is a part of the housing 210, the heat received by the convex portion 300 and the connecting portion 310 is transmitted from the wall portion 320 to the entire housing 210, and the entire outer surface of the housing 210 can dissipate heat. Since heat can be dissipated from the entire outer surface of the housing 210, heat dissipation is excellent.

In the present embodiment, a configuration has been described in which the surface of the substrate extends along the axial direction and the motor 220, the convex portion 300, and the heat-generating component 43 overlap in the radial direction, but this is not limiting. The substrate surface may be arranged in a direction intersecting the axial direction, or the motor 220, the convex portion 300, and the heat-generating component 43 may overlap in the axial direction. That is, when viewed from a cross section along the axial direction, the motor 220, the convex portion 300, and the heat-generating component 43 overlap from one axial direction to the other axial direction. A configuration in which the motor 220, the convex portion 300, and the heat-generating component 43 overlap is also possible. When the motor 220, the convex portion 300, and the heat-generating component 43 overlap in the axial direction, the partition wall portion 330 does not have to be arc-shaped, and may have a concave portion or a hole.

In this embodiment, the circuit board 40 is accommodated in the board housing 213, and the protrusion 300 and the connecting part 310 are provided in the board housing 213. The board cover 241 may be shaped like a box with an opening at the bottom, and the projection 300 and the connecting part 310 may be provided inside the substrate cover 241 as well. By providing the convex portion 300 and the connecting portion 310 on the substrate cover 241 as well, heat can be dissipated more effectively.

The configurations (components) described in the above embodiments, modifications, notes, etc. may be combined without departing from the spirit of the present invention, and additions, omissions, replacements, and other changes of configurations may It is possible. Although the busbar unit 250 has the joint busbar holder 252 in the present embodiment, the joint busbar holder 252 may not be provided. Although the second long side (long side) of the circuit board 40 is arranged along the axial direction in this embodiment, the second short side (short side) of the circuit board 40 is arranged along the axial direction. can be placed in The circuit board 40 itself is downsized by devising the circuit configuration, and the second long side (2) of the circuit board 40 is set to the extent that the electric oil pump 200 does not adversely affect the attached body such as the transmission or body-related members of the nearby automobile. long side) may cross the axial direction. Further, even when the second short side (short side) of the circuit board 40 is arranged along the axial direction, it is possible to reduce the size in the radial direction by providing a plurality of circuit boards 40 and devising the arrangement of the plurality of circuit boards 40 . You may make it For example, within the range where the second long side (long side) of one circuit board 40 is arranged along the axial direction, a plurality of circuit boards can be arranged with the second short side (short side) along the axial direction. 40 may be arranged, and a plurality of circuit boards 40 may be arranged such that the board surfaces are overlapped with the second short side (short side) along the axial direction. In this embodiment, the mounting plate portion 70 has the suction port 731 , the discharge port 734 and the flow path 73 . For example, the circuit board 40 may be arranged on the side of the motor 220 so that the plate surface does not overlap the pump housing 212 , and the suction port 731 , the discharge port 734 and the flow path 73 may be configured around the pump housing 212 . In this embodiment, the mounting plate portion 70 has the mounting holes, but the mounting holes may be provided in other parts of the housing body 210 .

210: Housing (housing body)
211: Motor housing 213: Board housing 241: Board cover,
220: Motor 22: Rotor 23: Stator 224a: Busbar 224d: Busbar holder 210b: Through hole 30: Pump mechanism 40: Control board 43: Heat generating component 411: First surface 412: Second surface 250: Busbar units 251a to 251c: Joint busbar 252: Joint busbar holder J: Central axis 301: First convex part 302: Second convex part 303: Third convex part 304: Fourth convex part 311: First connecting part 312: Second connecting part 313: Third 3 connecting portion 314: fourth connecting portion 315: fifth connecting portion 320: wall portion 330: partition wall portion 70: mounting plate portion 71: mounting surface 711: first mounting surface 712: second mounting surface 713: third mounting surface 715: fifth mounting surface (inlet mounting surface)
716: Sixth mounting surface (discharge port mounting surface)

Claims (20)

a motor having a shaft rotatable around a central axis;
a pump mechanism connected to one axial side of the shaft;
a circuit board located outside in a radial direction orthogonal to the axial direction of the shaft;
a housing body capable of accommodating the motor and the circuit board;
with
The circuit board is
having a plate surface facing the shaft and along the axial direction and being a first surface having electronic components and a second surface on the opposite side of the first surface;
The housing body
A motor housing portion that accommodates the motor, a substrate housing portion that accommodates the circuit board, a pump housing portion that accommodates the pump mechanism, and a mounting plate portion positioned radially outward perpendicular to the axial direction of the shaft. have
The mounting plate portion
having a mounting surface facing the shaft and along the axial direction;
The motor and the pump mechanism are
An electric pump located on an inner corner side of an angle where a third surface including the plate surface and a fourth surface including the mounting surface intersect. The substrate housing portion
a first long side along the axial direction and a first short side that intersects the first long side and extends along the third surface;
The electric pump according to claim 1. The circuit board is
a second long side along the axial direction and a second short side that intersects the second long side and extends along the fourth surface;
The electric pump according to claim 1 or 2. The mounting plate portion
having a thickness in a radial direction perpendicular to the axial direction of the shaft;
The motor, the pump mechanism, and the mounting surface are
arranged through the thickness;
The electric pump according to claim 1. The substrate housing portion
It has a connector part for connecting to the outside,
The connector section
extending axially from the substrate housing portion;
The electric pump according to any one of claims 1 to 3 having a plurality of bus bars electrically connecting the motor and the circuit board;
The busbar is
connected to the end of the circuit board on the other side in the axial direction, which is the motor side;
The connector section
extending from the end of the substrate housing portion on one axial side, which is the pump mechanism side;
The electric pump according to claim 5. The mounting plate portion has at least two mounting holes,
The mounting hole has a first mounting hole and a second mounting hole,
The first mounting hole is
located on one side in the axial direction of the pump housing portion,
The electric pump according to claim 1 or 4. The mounting plate portion has at least two mounting holes,
The mounting hole has a first mounting hole and a second mounting hole,
The second mounting hole is
located on the other side in the axial direction of the motor housing portion,
The electric pump according to claim 1 or 4. At least one of the mounting holes
between the upper end and the lower end of the housing body when viewed in a direction orthogonal to the fourth surface;
The electric pump according to claim 7 or 8. The mounting plate portion
an inlet for sucking fluid by the pump mechanism;
a discharge port for discharging fluid by the pump mechanism;
The electric pump according to claim 1. The mounting plate portion
having at least two mounting holes;
The mounting hole is
having a first mounting hole on one side in the axial direction and a second mounting hole on the other side in the axial direction,
The inlet and the outlet are
Located between the first mounting hole and the second mounting hole,
The electric pump according to claim 10. The mounting plate portion has a third mounting hole,
The inlet and the outlet are
positioned between the third mounting hole and the first mounting hole or the second mounting hole when viewed from the axial direction;
12. Electric pump according to claim 11. The mounting surface is
an inlet face portion surrounding the inlet;
and an ejection port face portion surrounding the periphery of the ejection port.
The electric pump according to claim 10. The suction port is
When the mounting surface is viewed from a direction orthogonal to the fourth surface, the mounting surface is axially displaced from the discharge port.
14. Electric pump according to any one of claims 10-13. The mounting plate portion
Having a flow path through which fluid to be sucked and discharged by the pump mechanism flows,
The electric pump according to claim 10. The flow path is
a suction channel and a discharge channel extending radially from the mounting surface and connected to the pump mechanism;
The suction channel is
when viewed from the direction orthogonal to the fourth surface, axially between the discharge flow path and the motor;
16. Electric pump according to claim 15. The flow path is
a discharge channel extending radially from the mounting surface and connected to the pump mechanism;
a first suction passage radially extending from the mounting surface toward the shaft;
a second suction channel connected to the first suction channel and axially passing through the mounting plate;
a third suction flow path connected to the second suction flow path and radially extending to the pump mechanism;
The third suction flow path is
is between the discharge channel and the first intake channel in the axial direction when viewed from the direction perpendicular to the fourth surface;
16. Electric pump according to claim 15. The flow path is
a suction flow path connected from the suction port to the pump mechanism side;
a discharge passage leading from the discharge port to the pump mechanism;
a relief channel branched from the discharge channel for returning the fluid to the suction channel side;
16. Electric pump according to claim 15. At least a part of the suction channel,
overlapping the relief channel in a direction intersecting the axial direction when viewed from the direction along the fourth surface;
19. Electric pump according to claim 18. The mounting plate portion
between the lower end of the substrate housing portion and the upper ends of the motor housing portion and the pump housing portion when viewed in a direction perpendicular to the fourth surface;
The electric pump according to claim 1.

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