Electric pump

Abstract

An electric pump includes: a motor having a shaft rotatable around a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located radially outwardly orthogonal to the axial direction of the shaft; and an outer shell capable of accommodating the motor and the circuit substrate. The circuit substrate has a plate surface opposite to the shaft and along the axial direction. The outer shell includes a motor housing portion, a substrate housing portion, a pump housing portion, and a mounting plate portion, the mounting plate portion being located radially outwardly orthogonal to the axial direction of the shaft. The mounting plate portion has a mounting surface opposite to the shaft and along the axial direction. The motor and the pump mechanism are located on the inner corner side of the angle where a third surface including the plate surface intersects a fourth surface including the mounting surface.

Description

Technical Field

[0001] The invention relates to an electric pump. Background Art

[0002] Conventionally, there is known a structure in which a heat sink is provided outside a motor unit, and power circuit components such as FET are fixed to the heat sink with screws to dissipate heat generated in the power circuit components.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-159392. Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] In the motor unit of Patent Document 1, the heat generated by the motor cannot be rapidly dissipated, and there is a possibility that the motor may become hot and damaged, may not be able to operate for a long time at a high output, and may increase the size of the motor.

[0008] Technical solutions adopted to solve technical problems

[0009] According to one embodiment of the present invention, the present invention includes: a motor having a shaft that can rotate around a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located on the radially outer side orthogonal to the axial direction of the shaft; and an outer shell that can accommodate the motor and the circuit substrate. The circuit substrate has a plate surface, which is a first surface having electronic components opposite to the shaft and along the axial direction and a second surface on the opposite side of the first surface, and the outer shell has: a motor housing portion that accommodates the motor; a substrate housing portion that accommodates the circuit substrate; a pump housing portion that accommodates the pump mechanism; and a mounting plate portion that is located on the radially outer side orthogonal to the axial direction of the shaft, and the mounting plate portion has a mounting surface opposite to the shaft and along the axial direction, and the motor and the pump mechanism are located on the inner angle side of the angle where the third surface including the plate surface and the fourth surface including the mounting surface intersect.

[0010] Effects of the Invention

[0011] According to one aspect of the present invention, it is possible to provide an electric pump that can be reduced in size in the radial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the electric pump according to the present embodiment.

[0013] Figure 2 It is a perspective view showing the internal structure of the electric pump according to the present embodiment.

[0014] Figure 3 It is a perspective view showing a bus bar unit according to this embodiment.

[0015] Figure 4 It is a cross-sectional view of the electric pump along the first connecting portion.

[0016] Figure 5 This is a partial cross-sectional view of the housing and motor.

[0017] Figure 6 It is a perspective view showing the interior of the third housing recess.

[0018] Figure 7 This is a diagram of the interior of the third housing recessed portion as viewed from the − side to the + side in the Z direction.

[0019] Figure 8 This is a cross-sectional view of a portion of the electric pump according to the present embodiment cut along a direction intersecting the axial direction at a position rearward of the second connection portion.

[0020] Fig. 9 This is a cross-sectional view of a portion of the electric pump according to the present embodiment cut along a direction intersecting the axial direction at a position closer to the front side than the second connection portion.

[0021] Fig.10 This is a schematic diagram of the electric pump according to the present embodiment as viewed in the axial direction.

[0022] Fig.11 It is a perspective view showing the external appearance structure of the electric pump according to the present embodiment.

[0023] Fig.12 It is a perspective view schematically showing each flow path of this embodiment.

[0024] (Explanation of symbols)

[0025] 210: Shell (outer shell)

[0026] 211: Motor housing

[0027] 213: Baseboard housing

[0028] 241: Substrate cover

[0029] 220: Motor

[0030] 22: Rotor

[0031] 23: Stator

[0032] 224a: Busbar

[0033] 224d: Busbar holder

[0034] 210b: Through hole

[0035] 30: Pump mechanism

[0036] 40: Control board

[0037] 43: Heat generating components

[0038] 411: First Side

[0039] 412: Side 2

[0040] 250: Busbar unit

[0041] 251a~251c:Connector busbar

[0042] 252: Connector busbar holder

[0043] J: Center axis

[0044] 301: First convex part

[0045] 302: Second convex part

[0046] 303: The third convex part

[0047] 304: The fourth convex part

[0048] 311: First connection part

[0049] 312: Second connection part

[0050] 313: Third connection

[0051] 314: Fourth connection

[0052] 315: Fifth Link

[0053] 320: Wall

[0054] 330: Next door

[0055] 70: Installation plate

[0056] 71: Mounting surface

[0057] 711: First mounting surface

[0058] 712: Second mounting surface

[0059] 713: Third mounting surface

[0060] 715: Suction port mounting surface

[0061] 716: Discharge port mounting surface DETAILED DESCRIPTION

[0062] Hereinafter, an electric oil pump will be described as an example of the present embodiment of the electric motor and the electric pump. The electric oil pump of the embodiment is used to supply oil to equipment mounted on a vehicle or the like.

[0063] In the drawings referred to below, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the X-axis direction is Figure 1 and Figure 5 The Y-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG. The central axis J is the central axis of the shaft 21 of the motor 220 described later. The Y-axis direction is a direction perpendicular to the X-axis. Figure 1 and Figure 5 The Z-axis direction is a direction that is orthogonal to both the X-axis direction and the Y-axis direction. Figure 1 and Figure 5 In any of the X-axis direction, the Y-axis direction, and the Z-axis direction, the side to which the arrow shown in the figure points is the + side, and the opposite side is the - side.

[0064] In the following description, unless otherwise specified, the direction parallel to the central axis J (X-axis direction) is referred to as the "axial direction". The radial direction centered on the central axis J is referred to as the "radial direction". The circumferential direction centered on the central axis J, that is, the axial direction around the central axis J (θ direction) is referred to as the "circumferential direction".

[0065] In addition, the positive side (+X side) in the X-axis direction is sometimes referred to as the "front side". Similarly, the negative side (-X side) in the X-axis direction is sometimes referred to as the "rear side". The front side (+X side) corresponds to one axial side of the present invention. The rear side (-X side) corresponds to the other axial side of the present invention.

[0066] Below, refer to Figures 1 to 12 The electric oil pump 200 according to the present embodiment will be described.

[0067] like Figure 1 and Figure 2 As shown, the electric oil pump 200 of the present embodiment includes a housing 210 , a motor 220 , a pump mechanism 30 , and a circuit board 40 .

[0068] The housing 210 includes: a motor housing 211 (motor housing portion) housing the motor 220; a pump housing 212 housing the pump mechanism 30; a substrate housing 213 (circuit substrate housing portion) housing the circuit substrate 40; a partition wall 330 separating the motor housing 211 (motor housing portion) and the substrate housing 213 (circuit substrate housing portion); a convex portion 300 protruding from the partition wall 330; a connecting portion 310; and a substrate cover 241. The housing 210 is an outer shell having the motor housing 211, the pump housing 212, the substrate housing 213, and the like. In the present embodiment, the motor housing 211 as the motor housing portion, the pump housing 212, the substrate housing 213 as the circuit substrate housing portion, the partition wall 330, and the convex portion 300 are part of a single member.

[0069] The motor housing 211 as the motor housing is located at the rear side (-X side) of the housing 210. The motor housing 211 is cylindrical and extends in the axial direction. The motor housing 211 has a first housing recess 211a formed of a recess opened at the rear side. The first housing recess 211a is closed from the rear side by a bearing holder 226 described later.

[0070] 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 formed of a recess opened on the front side. The electric oil pump 200 has a pump cover 212b that closes the second housing recess 212a from the front side.

[0071] The substrate housing 213 as a circuit substrate storage portion is located on the side of the motor housing 211 (motor storage portion) and the pump housing 212 arranged in the axial direction. The substrate housing 213 is located on the lower side (-Z side) of the motor housing 211 and the pump housing 212 as shown in the figure. The substrate housing 213 is substantially rectangular when viewed from the radial outside. The substrate housing 213 has a shape having long sides in the axial direction and short sides in a direction intersecting the axial direction. The substrate housing 213 has a third storage recess 213a that opens toward the lower side of the housing 210 as shown in the figure.

[0072] The housing 210 has a first through hole 210a, which connects the first receiving recess 211a of the motor housing 211, which is a motor receiving portion, with the second receiving recess 212a of the pump housing 212 in the axial direction. The housing 210 has a second through hole 210b, which connects the first receiving recess 211a with the third receiving recess 213a of the substrate housing 213, which is a circuit substrate receiving portion, in the radial direction. That is, the second through hole 210b extends radially between the motor housing 211 and the substrate housing 213, and is a receiving portion for receiving the connector busbars 251a to 251c described later. The above-mentioned receiving portion may also be a groove that opens in the axial direction and extends radially.

[0073] The motor 220 includes a rotor 22 having a shaft 21, a stator 23 having a winding, a busbar assembly 224, a busbar cover 225, a bearing holder 226, and a first bearing 27 and a second bearing 28. The front end of the shaft 21 is connected to the pump mechanism 30.

[0074] 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. In the case of shrink fitting, the assembly is good, and after assembly, the housing 210 holds the outer periphery of the stator 23 as a whole, so the holding performance is good. That is, the motor housing 211 of the housing 210, which is the motor storage part, and the stator 23 are in contact.

[0075] Furthermore, in the case of assembly by insertion (clearance fit), a through hole may be provided on the radial outer side of the stator 23, and a threaded hole may be provided in the axial direction of the housing 210, and the stator 23 may be inserted into the housing 210 (motor housing 211) and threadedly fastened by bolts or the like. In this case, the radial gap between the stator 23 and the housing 210 (motor housing 211) may be coated by filling an adhesive to improve the radial retention of the stator 23. That is, the motor housing 211 of the housing 210, which is a motor storage portion, and the stator 23 are connected via an adhesive.

[0076] Furthermore, when assembling by insertion, the stator 23 may be brought into a state of being close to the circuit board 40 side (-Z side) or the like (in a state of being in contact with the motor housing 211 of the housing 210 ) using a jig in advance and then screwed.

[0077] The circuit substrate 40 is, for example, a control substrate including a motor drive circuit, a control unit for controlling the drive of the motor, and a circuit for preventing reverse connection. In addition, the circuit substrate 40 includes a power input unit and a motor power output unit. The circuit substrate 40 has a plurality of heat generating components 43. The board surface of the circuit substrate 40 includes: a first surface 411 having the heat generating components 43; and a second surface 412 on the opposite side of the first surface 411.

[0078] In the present embodiment, the circuit substrate 40 is in the shape of a rectangular plate extending in the axial direction. In the present embodiment, the circuit substrate 40 is in the shape of a rectangle having long sides in the axial direction and short sides in the direction intersecting the axial direction (Y-axis direction) and rounded corners. The circuit substrate 40 is located radially outward of the motor 220 and the pump mechanism 30, and the plate surface of the circuit substrate 40 faces the motor 220 and the pump mechanism 30. In the present embodiment, the circuit substrate 40 has a power input portion at the axial front end and a motor power output portion at the axial rear end.

[0079] The heat generating component 43 is, for example, a plurality of transistors 431 and a microcomputer 432. The plurality of transistors 431 constitute, for example, a motor drive circuit, and the microcomputer 432 controls energization of the motor drive circuit.

[0080] The heat generating component 43 is, for example, soldered to the first surface 411 of the circuit substrate 40. The heat generating component 43 has a metal surface 434, which is composed of a metal plate soldered to the first surface 411 of the circuit substrate 40, and a resin surface 435 made of resin, wherein the metal surface is composed of a metal plate soldered to the first surface 411 of the circuit substrate 40, and the resin surface is not soldered to the first surface 411 of the circuit substrate 40. When the metal surface 434 of the heat generating component 43 and the first surface 411 of the circuit substrate 40 are soldered relative to each other, the resin surface 435 on the opposite side of the metal surface 434 faces the same direction as the first surface 411 of the circuit substrate 40.

[0081] The circuit substrate 40 has a substrate through hole (through hole) in the area of ​​the metal surface 434 to which the heat generating component 43 is soldered, and the substrate through hole penetrates from the first surface 411 to the board surface on the side opposite to the first surface 411, that is, the second surface 412. The substrate through hole has copper foil around the inner surface of the hole and the opening part of the substrate through hole in the first surface 411 and the second surface 412. The copper foil is continuous and connected at the first surface 411 side and the second surface 412 side. The opening part of the substrate through hole of the first surface 411, the inner surface of the substrate through hole, and the opening part of the substrate through hole of the second surface 412 can transfer the heat of the heat generating component 43 from the first surface 411 to the second surface 412 through the continuous copper foil. Through this structure, the circuit substrate 40 can dissipate the heat of the heat generating component 43 from the first surface 411 side (from the heat generating component 43 itself), and can also dissipate it from the second surface 412 side.

[0082] The circuit substrate 40 is installed in the substrate housing 213 of the housing 210 as the circuit substrate storage portion so that the first surface 411 or the second surface 412 as the board surface of the circuit substrate 40 faces the convex portion 300 side (the motor 220 side) in such a manner that the heat generating component 43 overlaps with the convex portion 300 of the housing 210 described later. That is, the heat generating component 43 is arranged to overlap with the convex portion 300. In the case of installing with the first surface 411 facing the convex portion 300 side, by assembling in such a manner that the resin surface 435 of the heat generating component 43 contacts the convex portion 300, the heat of the heat generating component 43 can be transferred to the convex portion 300. That is, the heat of the heat generating component 43 can be dissipated to the convex portion 300.

[0083] Furthermore, when the circuit substrate 40 is installed with the second surface 412 facing the convex portion 300, the circuit substrate 40 is assembled to the substrate housing 213 of the housing 210 as the circuit substrate storage portion in such a manner that the heat generating component 43 overlaps the convex portion 300. Since the heat generating component 43 overlaps the convex portion 300, the substrate through-holes in the area where the heat generating component 43 is soldered also overlap with the convex portion 300. Alternatively, the circuit substrate 40 may be assembled with the heat dissipating component 51 sandwiched between the second surface 412 and the convex portion 300.

[0084] like Figure 6 As shown, the busbar assembly 224 has three busbars 224a, 224b, 224c and a resin busbar holder 224d, which holds the busbars 224a to 224c. The busbar holder 224d is annular when viewed from the axial direction. The three busbars 224a to 224c are screwed to the rear side of the busbar holder 224d.

[0085] The bus bar assembly 224 is located at the rear side of the stator 23. The bus bar assembly 224 is inserted into the first receiving recess 211a of the motor housing 211 from the rear side.

[0086] The end of one side of the three busbars 224a to 224c is connected to the coil wire 23d extending from the coil 23c to the rear side. The three busbars 224a to 224c extend from the connection position connected to the coil wire 23d to the substrate housing 213 side. The end of the other side of the three busbars 224a to 224c is arranged at the end of the busbar holder 224d on the substrate housing 213 side (the lower side in the figure). The end of the other side of the three busbars 224a, 224b, and 224c are respectively connected to the three joint busbars 251a, 251b, and 251c described later.

[0087] like Figure 5 As shown, the busbar cover 225 is located at the rear side of the busbar assembly 224. The busbar cover 225 is inserted into the first receiving recess 211a from the rear side. The busbar cover 225 is annular when viewed from the axial direction. The busbar cover 225 covers the busbar assembly 224 from the rear side. The bearing holder 226 is covered from the rear side of the busbar cover 225. The bearing holder 226 blocks the first receiving recess 211a from the rear side.

[0088] The busbar cover 225 has a step portion 225a at the outer peripheral end facing the rear side. The step portion 225a has a surface facing the rear side and a surface facing the radial outside. An elastic member 225b composed of an O-ring is arranged inside the step portion 225a. The elastic member 225b is clamped by the bearing holder 226 and the busbar cover 225 in the axial direction. The bearing holder 226 presses the busbar cover 225 to the front side via the elastic member 225b.

[0089] The busbar cover 225 functions as a spacer inserted between the busbar assembly 224 and the bearing holder 226. The busbar cover 225 is pressed forward by the elastic member 225b to press the busbar assembly 224 forward. With this structure, the busbar cover 225 fixes the busbar assembly 224 in the axial direction. The busbar cover 225 and the busbar assembly 224 may be part of a single component.

[0090] The bearing holder 226 is a disc-shaped member that covers the busbar cover 225 from the rear side. The bearing holder 226 includes: a cylindrical portion 226a, which extends along the central axis J; and a holder body 226b, which extends radially outward from the outer peripheral surface of the cylindrical portion 226a. The cylindrical portion 226a is open on both sides of 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.

[0091] The bearing holder 226 extends radially to the outside of the busbar cover 225. The bearing holder 226 is screwed to the housing 210 at the radial outside of the busbar cover 225. The breather 26b is inserted into the rear end of the cylindrical portion 226a.

[0092] The second bearing 28 is inserted from the rear into the first through hole 210a connecting the first housing recess 211a and the second housing recess 212a. The oil seal 15, the fixing ring 16, the bellows washer 17 and the second bearing 28 are arranged in the first through hole 10a in this order from the front.

[0093] The shaft 21 passes through the inner holes of the second bearing 28, the bellows washer 17, the fixing ring 16, and the oil seal 15. The front end of the shaft 21 is connected to the pump mechanism 30.

[0094] The busbar unit 250 connects the motor 220 and the circuit substrate 40. The busbar unit 250 is connected to the end of the rear side of the circuit substrate 40. The busbar unit 250 is housed inside the second through hole 210b that connects the third storage recess 213a and the first storage recess 211a. In addition, the busbar unit 250 may not be used, but the motor 220 and the circuit substrate 40 may be directly connected through the three busbars 224a to 224c. For example, the three busbars 224a to 224c and a component serving as a fixing member may be integrally molded with resin, and screwed to the housing 210 at the fixing portion of the fixing member. In this case, the end of one side of the three busbars 224a to 224c can be connected to the coil wire 23d, and the end of the other side of the three busbars 224a to 224c can pass through the second through hole 210b and be connected to the circuit substrate 40. Through the above structure, the busbar retaining member 224d does not need to be annular when viewed from the axial direction. By extending the annular shape of the resin busbar cover 225 when viewed from the axial direction along the axial direction and also setting it to a cylindrical shape, it can serve as the annular shape of the busbar retaining member 224d to separate the housing 210 from the busbars 224a~224c.

[0095] One end portion of the joint bus bars 251 a to 251 c extends from the joint bus bar holder 252 toward the motor 220 . The other end portions of the joint bus bars 251 a to 251 c extend from the joint bus bar holder 252 toward the circuit board 40 .

[0096] The other ends of the three joint bus bars 251a to 251c penetrate the circuit substrate 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 substrate 40. Moreover, in the case where the motor 220 and the circuit substrate 40 are directly connected through the three bus bars 224a to 224c without using the three joint bus bars 251a to 251c, the other ends of the three bus bars 224a to 224c can also be penetrated in the thickness direction of the circuit substrate 40 in the same manner and soldered to the wiring pattern on the circuit substrate 40.

[0097] The housing 210 also has a plate-shaped mounting plate portion 70 for mounting the electric oil pump 200 on a mounted body such as an oil pan of an automobile. The mounting plate portion 70 has a mounting surface 71 extending in the axial direction, and the electric oil pump 200 is mounted on the mounted body through a fixing member in a state where the mounting surface 71 is in contact with the mounted body. That is, the housing 210 has a mounting surface 71 extending in the axial direction and in contact with the mounted body. In addition, the housing 210 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 be continuously connected in the axial direction of the mounting plate portion 70 as a whole, and can also be constructed in multiple parts. As a fixing member, for example, bolts, press pins, rivets, etc. can be used. In this embodiment, considering the ease of disassembly, etc., bolts are used as fixing members.

[0098] The mounting plate portion 70 is located on the side of the motor housing 211 (motor housing portion) and the pump housing 212 arranged in the axial direction. The mounting plate portion 70 is located radially outside the motor housing 211 and the pump housing 212 arranged in the axial direction. The mounting plate portion 70 has a thickness in the direction away from the motor housing 211 and the pump housing 212. The mounting surface 71 of the mounting plate portion 70 passes through the thickness from the motor 220 and pump mechanism 30 side (center axis J side) in the mounting plate portion 70 and is farthest in the +Y axis direction. The mounting surface 71 in the mounting plate portion 70 is not limited to the +Y axis direction passing through the thickness from the motor 220 and pump mechanism 30 side (center axis J side). For example, the mounting surface 71 may also be provided in the mounting plate portion 70 on the motor 220 and pump mechanism 30 side (center axis J side), that is, in the -Y axis direction (refer to Figure 2 ). By arranging the mounting surface 71 that contacts the mounted body on the side of the center axis J, the electric oil pump 200 can be mounted on the mounted body in a state where the mounting plate portion 70 is arranged on the outside of the electric oil pump 200, and the mounting plate portion 70 can protect the motor and pump mechanism from adverse effects from the outside. By arranging a columnar protrusion from the mounted body, the mounting surface 71 can be mounted on the mounted body even on the side of the center axis J, that is, in the -Y axis direction, in the mounting plate portion 70.

[0099] The mounting plate portion 70 is located at a position where the mounting surface 71 intersects with the board surfaces 411 and 412 of the circuit substrate 40. That is, the mounting plate portion 70 and the mounting surface 71 as well as the substrate housing 213 and the board surface (411 or 412) of the circuit substrate 40 as the circuit substrate storage portion are located on the side surfaces of the motor housing 211 and the pump housing 212 arranged in the axial direction, and the mounting plate portion 70 and the mounting surface 71 are in a positional relationship facing each other with respect to the substrate housing 213 and the board surface of the circuit substrate 40. Therefore, the extension surface of the mounting surface 71 intersects with the extension surface of the board surface of the circuit substrate 40. In this embodiment, as Fig.10 , Figure 2As shown, the mounting plate portion 70 extends in the +Z direction, and the circuit substrate 40 extends in the -Y direction. When the mounting surface 71 and the board surface (411 or 412) of the circuit substrate 40 are extended in an imaginary manner, they collide in the Z direction and the Y direction, and a corner portion in the Z direction and the Y direction is generated. The motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are located on the inner angle β side of the corner portion generated by the mounting surface 71 and the board surface (411 or 412) of the circuit substrate 40 being extended in an imaginary manner. That is, the motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are located on the inner angle side of the angle where the third surface obtained by imaginary extension of the mounting surface 71 and the fourth surface obtained by imaginary extension of the board surface of the circuit substrate 40 intersect. Alternatively, the motor 220 (motor housing 211) and the pump mechanism 30 (pump housing 212) are located on the inner angle side of the angle where the third surface obtained by imaginary extension of the mounting surface 71 intersects with the board surface of the circuit substrate 40, or on the inner angle side of the angle where the mounting surface 71 intersects with the fourth surface obtained by imaginary extension of the board surface of the circuit substrate 40.

[0100] The above structure can reduce the size in the radial direction compared to the case where the mounting plate portion 70, the motor 220, the pump mechanism 30, and the circuit substrate 40 are arranged in this order along the mounting surface 71 and away from the mounting surface 71. Moreover, it can be reduced in size compared to the case where the circuit substrate 40 is arranged with the plate surface in a direction intersecting the axial direction. For example, in a structure where the circuit substrate 40 serving as a control substrate is arranged with the plate surface in a direction intersecting the axial direction, the long side of the circuit substrate 40 may be longer than the radial direction of the motor 220 and the pump mechanism 30, and it may not be reduced in size in the radial direction. If it is not possible to reduce the size in the radial direction, the electric oil pump 200 installed on the oil pan of the automobile or the like may interfere with the transmission and body-related components of the adjacent automobile.

[0101] In the present embodiment, the circuit substrate 40 has a power input portion at the axial front end and a motor power output portion at the axial rear end. The power input to the power input portion disposed at the axial front end of the circuit substrate 40 is output from the motor power output portion disposed at the axial rear end of the circuit substrate 40 via the substrate wiring pattern disposed on the circuit substrate 40. That is, after the power is input to the substrate wiring pattern at the axial front end of the circuit substrate 40, it is output from the axial rear end of the circuit substrate 40 to the busbar of the motor 220. In the above structure, the circuit substrate 40 can adopt the following substrate wiring pattern. That is, for the flow of the power input to the power input portion in the circuit substrate 40, in the process of reaching the motor power output portion, a substrate wiring pattern is not provided in which a route is returned from the axial rear side to the axial front side, or the above route is suppressed to a minimum. Therefore, according to the electric oil pump 200, compared with a structure in which the motor power output portion is arranged at a position different from the axial rear end of the circuit substrate 40, the total length of the substrate wiring pattern can be shortened to seek miniaturization (area reduction) of the circuit substrate 40. Since there is no route returning from the axial rear side to the axial front side, the circuit substrate 40 does not need a substrate wiring pattern in the short side direction (Y-axis direction), so that the short side direction (second short side direction) of the circuit substrate 40 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 substrate 40 in the axial direction or arranging it on the side of the motor 220 and the pump mechanism 30 arranged in the axial direction, the electric oil pump 200 can be made smaller in the radial direction.

[0102] 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 the above structure, the mounting plate portion 70 does not protrude to the outside compared to the outer shape of the motor housing 211 and the pump housing 212, so that the electric oil pump 200 can be reduced in size in the radial direction.

[0103] The mounting plate portion 70 has at least two mounting holes 721 and 722, and the mounting holes 721 and 722 are located axially outward from the pump housing 212 and axially outward from the motor housing 211. Moreover, the mounting holes 721 and 722 are located between the substrate housing 213 and the motor housing 211 and the pump housing 212 in the Z direction. With the above structure, the mounting holes 721 and 722 do not protrude radially outward, so that the size can be reduced in the radial direction.

[0104] The mounting plate portion 70 has a suction port 731 for sucking the fluid sucked and discharged by the pump mechanism 30, a discharge port 734 for discharging the fluid, and a flow path 73 for the fluid to flow in the axial range from the front mounting hole 721 (first mounting hole 721) to the rear mounting hole 722 (second mounting hole 722). With the above structure, the mounting plate portion 70 has the suction port 731, the discharge port 734, and the flow path 73, so it can be made smaller than in the case where there is a structure having the suction port 731, the discharge port 734, the flow path 73, etc. around the mounting plate portion 70.

[0105] The suction port 731 and the 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. With the above structure, the suction port 731 and the discharge port 734 are provided in the axial range between the first mounting hole 721 and the second mounting hole 722 located axially outward from the motor housing 211 and axially outward from the pump housing 212. Therefore, the suction port 731 and the discharge port 734 are not located axially outward from the mounting holes 721 and 722, and thus become smaller in the axial direction.

[0106] The mounting plate portion 70 also has a front mounting hole 723 (third mounting hole 723). When the mounting surface 71 is observed from the front, the third mounting hole 723 is offset in the radial direction (Z direction) of the center axis J relative to the first mounting hole 721. Since the mounting plate portion 70 also has the third mounting hole 723, the fixation to the mounted body is improved and the fixation of the electric oil pump 200 is stabilized. By fixing the three parts of the first to third mounting holes, the fixation of the electric oil pump 200 is improved and stabilized, and therefore, the fixation of the suction port 731 and the discharge port 734 to the mounted body is improved and stabilized. The suction port 731 and the discharge port 734 are provided in the radial direction (Z direction) from the first mounting hole 721 to the third mounting hole 723 of the mounting plate portion 70. In the above structure, in the Z direction, the mounting plate portion 70 is located between the substrate housing 213 and the motor housing 211 and the pump housing 212, and has the suction port 731 and the discharge port 734 in the radial direction (Z direction) range of the first mounting hole 721 to the third mounting hole 723 of the mounting plate portion 70. Therefore, the suction port 731 and the discharge port 734 can be reduced in size in the radial direction compared to the case where the suction port 731 and the discharge port 734 are located radially outward of the mounting holes 721 and 723. In addition, the suction port 731 and the discharge port 734 do not protrude in the Z direction relative to the outer shape of the mounting plate portion 70, and are therefore small.

[0107] When viewed from the mounting surface 71 side (when viewed from the + side to the - side in the Y direction), the suction port 731 and the discharge port 734 are offset from each other in the axial direction. In the present embodiment, the suction port 731 is located at a position further axially rearward than the discharge port 734. Furthermore, when viewed with the + side in the Z direction as the upper side, the suction port 731 is located at a position further down in the Z direction than the discharge port 734. With the above structure, the suction port 731 and the discharge port 734 can be reduced in size in the radial direction, compared with the case where the suction port 731 and the discharge port 734 are located at the same axial position and the suction port 731 and the discharge port 734 are arranged in sequence from the lower side in the Z direction.

[0108] In this embodiment, the mounting surface 71 does not need to be continuous throughout the entire mounting plate portion 70, and may be partially formed. The mounting surface 71 may also be provided only at a portion in contact with the mounted body. The mounting surface 71 may, for example, be formed only around the first mounting hole 721 to the third mounting hole 723, the suction port 731, and the discharge port 734. The mounting surface 71 may also be located around the positioning portion.

[0109] The mounting surface 71 may also have a suction port face portion 715 around the suction port 731 and a discharge port face portion 716 around the discharge port 734. The suction port 731 and the suction port face portion 715 are arranged axially staggered relative to the discharge port 734 and the discharge port face portion 716, thereby making it possible to further reduce the size in the radial direction compared to the case where the suction port 731 and the suction port face portion 715 and the discharge port 734 and the discharge port face portion 716 are arranged in the Z direction at the same position in the axial direction.

[0110] The flow path 73 has a suction side flow path 732 and a discharge side flow path 733. The suction side flow path 732 has, for example, a first suction flow path 7321 extending from the suction port 731 toward the pump mechanism 30 side in a direction intersecting the axial direction; a third suction flow path 7323 extending from the pump mechanism 30 side and the pump housing 212 to the mounting plate portion 70 side; and a second suction flow path 7322 connected to the first suction flow path 7321 and the third suction flow path 7323. Moreover, for example, the discharge side flow path 733 has a first discharge flow path 7331 extending from the pump mechanism 30 side and the pump housing 212 to the mounting plate portion 70 side. There may be one discharge side flow path 733 or more than two discharge side flow paths 733. In the case of the present embodiment, the flow path 73 has a pressure relief flow path 735, which branches off from the first discharge flow path 7331 and is connected to a position of the first suction flow path 7321 away from the second suction flow path 7322. The pressure relief flow path 735 is a flow path for returning the fluid discharged from the pump mechanism 30 to the suction side flow path 732. In the present embodiment, the pressure relief flow path 735 has a flow path along the axial direction and a flow path in a direction intersecting the axial direction. In the present embodiment, the third suction flow path 7323 is the final suction flow path connected to the pump mechanism 30 and the pump housing 212 in the flow path (path) from the suction port 731 to the pump mechanism 30. The final suction flow path is not limited to the third suction flow path 7323.

[0111] The third suction flow path 7323 (final suction flow path 7323) and the first discharge flow path 7331 lead to the mounting plate portion 70 and the pump housing 212 along each other's flow paths. In the present embodiment, the final suction flow path 7323 and the first discharge flow path 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, for example, during mold molding or by cutting. The final suction flow path 7323 and the first discharge flow path 7331 connected to the pump housing 212 are straight lines, so the resistance of the pump mechanism 30 when sucking and discharging the fluid is suppressed, and the performance reduction as a pump can be suppressed. In addition, since the final suction flow path 7323 and the first discharge flow path 7331 connected to the pump housing 212 are straight lines, it is easy to manufacture the housing 210.

[0112] The third suction flow path 7323 is produced by processing with a drill or the like from the mounting surface 71 side of the mounting plate portion 70. At this time, a cover member or a cap member is installed at the opening portion opened at the mounting plate portion 70 by pressing or threading, so as to close the connection between the third suction flow path 7323 and the outside.

[0113] The third suction flow path 7323 is located axially forward of the suction port 731 and the mounting surface (suction port face) 715 around the suction port and lower in the Z direction than the discharge port 734. With the above structure, the third suction flow path 7323 (final suction flow path 7323) without a mounting surface can be arranged in the axial forward of the suction port 731 and the mounting surface (suction port face) 715 around the suction port and lower in the Z direction of the discharge port 734 of the mounting plate portion 70. Therefore, even if the discharge port 734 and the third suction flow path 7323 (final suction flow path 7323) are arranged at adjacent positions in the axial direction, the mounting plate portion 70 can be made smaller in the Z direction. That is, it can be made smaller in the radial direction. Furthermore, as described above, the third suction flow path 7323 (final suction flow path 7323) and the first discharge flow path 7331 are connected to the pump housing 212 in a straight line, so there is no need to make the pump housing 212 a complex shape, and the pump housing 212 and the housing 210 can be made smaller in the axial and radial directions. The third suction flow path 7323 (final suction flow path 7323) does not need to be located at the same axial position as the discharge port 734, and can be offset axially from the center of the discharge port 734. The configuration position of the third suction flow path 7323 (final suction flow path 7323) can also be appropriately adjusted in consideration of the structure inside the housing 210 or the performance of the pump mechanism 30.

[0114] In the present embodiment, the second suction flow path 7322 and the pressure relief flow path 735 extend in the axial direction, staggered from the substrate housing 213 side to the motor housing 211 and the pump housing 212 side (in the Z direction), and are arranged to overlap each other at least partially in the radial direction (Y direction). The above structure is miniaturized in the radial direction. That is, the second suction flow path 7322 and the pressure relief flow path 735 provided on the mounting plate portion 70 overlap in the Z direction, so the thickness of the mounting plate portion 70 in the Y direction becomes smaller, so it can be miniaturized in the radial direction. The mounting plate portion 70 can be miniaturized in a manner that the thickness is thinned, so the length from the mounted body to the outer shape of the electric oil pump 200 can be shortened, thereby contributing to the miniaturization of the entire mounted body, or suppressing interference with components that may exist around the electric oil pump 200. In addition, since the thickness of the mounting plate portion 70 is thinned, the distance that the electric oil pump 200 protrudes from the mounted body in the direction perpendicular to the mounting surface 71 becomes shorter. Since the protruding distance of the electric oil pump 200 is shortened, the moment related to the protruding distance and the weight of the electric oil pump 200 is reduced, and the vibration and noise of the electric oil pump 200 during operation are reduced, or the influence of vibration on the electric oil pump 200 from the mounted object can be reduced.

[0115] In this embodiment, the electric oil pump 200 has a connector portion 2135 extending in the axial direction from the front side of the substrate housing 213. The connector portion 2135 is a portion for connecting the electric oil pump 200 to the outside. Figure 4and Figure 6 As shown, the connector part 2135 includes a terminal connected to a power input part (not shown) at the axial front end of the circuit substrate 40. The portion of the connector part 2135 that receives external connection is located between the substrate housing 213 and the motor housing 211 and the pump housing 212. That is, the connector part 2135 is located between the substrate housing 213 and the motor housing 211 and the pump housing 212 in the Z direction. With the above structure, compared with the case where the connector part 2135 is arranged in the Z direction from the substrate housing 213 to the direction away from the motor housing 211 and the pump housing 212, the size can be reduced in the radial direction.

[0116] The housing 210 has a partition wall portion 330 between the motor housing 211 as a motor storage portion and the substrate housing 213 as a circuit substrate storage portion. The partition wall portion 330 separates the motor housing 211 and the substrate housing 213, and is in contact with the outer periphery of the stator 23 of the motor 220. The partition wall portion 330 has a thickness in a direction away from the stator 23, and the surface on the opposite side in contact with the stator 23 is located on the inner side of the substrate housing. The partition wall portion 330 extends from the stator 23 to the pump housing 212 side. The partition wall portion 330 partially extends on the rear side to form a region of the second through hole 210b that connects the third storage recess 213a and the first storage recess 211a. The shape of the cross section of the partition wall portion 330 viewed from the axial direction is arc-shaped along the stator 23.

[0117] The housing 210 has a convex portion 300 that protrudes from the partition wall portion 330 toward the circuit board 40. The convex portion 300 is located between the stator 23 of the motor 220 and the heat generating component 43 of the circuit board 40 so as to overlap in the radial direction.

[0118] When assembled with the second surface 412 of the circuit substrate 40 facing the protrusion 300 , the stator 23 of the motor 220 , the protrusion 300 (including the partition wall 330 ), the heat dissipating component 51 , the circuit substrate 40 , and the heat generating component 43 are sequentially connected in order from the central axis J toward the radial outside.

[0119] The projection 300 is, for example, in a trapezoidal shape and is substantially rectangular when viewed from the opening side (−Z direction) of the substrate case 213 . The end of the projection 300 on the circuit substrate 40 side is in a surface shape along the second surface 412 of the circuit substrate 40 .

[0120] The convex portion 300 includes a first convex portion 301 protruding from the rear side of the motor 220 and a second convex portion 302 protruding from the front side of the motor 220. The first convex portion 301 and the second convex portion 302 are arranged in the axial direction and are arranged within the axial range of the motor. For example, the first convex portion 301 is located on the rear side of the motor 220 in a manner overlapping the motor 220 and the transistor 431 as a heat generating component. For example, the second convex portion 302 is located on the front side of the motor 220 in a manner overlapping the motor 220 and the microcomputer 432 as a heat generating component.

[0121] For example, the first convex portion 301 has a rectangular shape having long sides in the axial direction and extends in the axial direction. The second convex portion 302 has a substantially square shape, for example.

[0122] The substrate housing 213 of the housing 210, which serves as a circuit substrate storage portion, has a wall portion 320 that covers the periphery of the circuit substrate 40. The wall portion 320 has a surface in a direction intersecting with the board surface of the circuit substrate 40 and in a direction along the board surface. The wall portions 321 and 322 intersecting with the board surface of the circuit substrate 40 stand up in the -Z direction in a manner surrounding the thickness of the circuit substrate 40. The wall portion 323 along the board surface of the circuit substrate 40 extends in the axial front side, for example, in a manner opposite to the board surface. The outer side of the wall portion 320 is the outside of the electric oil pump 200, and the wall portion has an outer surface when viewed from the outside. That is, the wall portion 320 faces the inside of the substrate housing 213, which serves as a circuit substrate storage portion, and the outside of the electric oil pump 200.

[0123] 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.

[0124] The wall 320 of the substrate housing 213 has a wall 322 connecting corners (ends) of a wall 321 having a surface along the axial direction. The wall 320 of the substrate housing 213 has a wall 321 connecting corners (ends) of a wall 322 intersecting the axial direction.

[0125] (There is a third convex part)

[0126] 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 located, for example, in a direction intersecting the axial direction from the first convex portion 301 (Y-axis direction). The third convex portion 303 is located between the first convex portion 301 and the wall portion 320, and protrudes from the partition portion 330. The shape of the third convex portion 303 is a cone-shaped shape similar to the first convex portion 301, and is substantially rectangular when viewed from the opening side (-Z direction) of the substrate housing 213. When the direction from the partition portion 330 to the circuit substrate 40 side (-Z direction) of the convex portion 300 is set as the height of the convex portion 300, the end of the third convex portion 303 on the circuit substrate 40 side is located, for example, at the same height as the end of the first convex portion 301 on the circuit substrate 40 side.

[0127] In the cross section observed from the axial direction, the next wall portion 330 is in an arc shape centered on the central axis J. In the cross section observed from the axial direction, the closer the outer side (wall side) of the next wall portion is to the wall portion 320, the lower the position in the height direction of the convex portion 300 becomes. In the present embodiment, the first convex portion 301 protrudes from the center of the next wall portion 330 in the cross section observed from the axial direction, and the third convex portion 303 protrudes from the next wall portion 330, between the first convex portion 301 and the wall portion 320 in the cross section observed from the axial direction. With the above structure, the height of the third convex portion 303 is higher than the height of the first convex portion 301. The first convex portion 301 and the third convex portion 303 have the same outer shape, and therefore, the volume of the third convex portion 303 is larger than the first convex portion 301.

[0128] In the present embodiment, the first protrusion 301 is located at the center of the partition wall 330 in the cross section viewed from the axial direction. In addition, the third protrusion 303 is provided on the left and right sides of the first protrusion 301 in the cross section viewed from the axial direction. The first protrusion 301 and the third protrusion 303 are respectively substantially rectangular when viewed from the opening side (-Z direction) of the substrate housing 213, and have the same length extending in the axial direction.

[0129] The convex portion 300 further includes a fourth convex portion 304 protruding from the front wall portion 323. 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. For the fluid sucked in and discharged by the pump mechanism 30, the heat transferred to the fourth convex portion 304 through the above structure can be transferred to the fluid sucked in and discharged by the pump mechanism 30. Therefore, the heat transferred to the heat generating component 43 (transistor 431 of the reverse connection prevention circuit) of the third connecting portion 313 can be dissipated to the fluid.

[0130] (Connection exists)

[0131] The housing 210 has a connecting portion 310 connecting 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 protrudes from the partition wall portion 330 toward the circuit substrate 40 side and is in the shape of a plate having a surface in a direction intersecting the axial direction or in a direction along the axial direction. The connecting portion 310 may not be connected to the partition wall portion 330.

[0132] (First connecting portion)

[0133] The connecting portion 310 includes 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 the present embodiment, the first connecting portion 311 extends in the axial direction from the front side of the first convex portion 301 to connect the first convex portion 301 and the fourth convex portion 304. Moreover, the second convex portion 302 is located between the first convex portion 301 and the fourth convex portion 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 via the first connecting portion 311 and is connected.

[0134] (Second connecting part)

[0135] 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 the wall portion 321 having a surface along the axial direction. Moreover, 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 of the second connecting portion 312. The third convex portion 303 is connected and connected to the first convex portion 301 and the wall portion 321 having a surface along the axial direction via the second connecting portion 312. From the wall portion 321 on one side of the direction intersecting the axial direction (Y-axis direction) to the wall portion 321 on the other side, the second connecting portion 312 connects the first convex portion 301 and the third convex portion 303 in a straight line.

[0136] The connection portion 310 further includes a third connection portion 313 extending from the first connection portion 311 in a direction intersecting the axial direction and connected to the wall portion 320 , and a fourth connection portion 314 extending from the second connection portion 312 in the axial direction and connected to the wall portion 320 .

[0137] The third connecting portion 313 extends in 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 connects the wall portion 321 having a surface along the axial direction from one side to the other side in a straight line. When the height is taken as the direction from the partition wall portion 330 to the circuit substrate 40 side (-Z direction) when viewed in the axial direction, the third connecting portion 313 has a stepped shape with a changed height.

[0138] The third connection part 313 is located at the front side, for example. At least a part of the third connection part 313 overlaps with the pump housing 212 in the radial direction when viewed from the opening side (-Z direction) of the substrate housing 213. The housing 210 has a flow path 31 for the fluid sucked in and discharged by the pump mechanism 30 to flow, and the outer wall of the flow path 31 is located on the inner side of the third storage recess 213a of the substrate housing 213. At least a part of the third connection part 313 protrudes from the outer wall of the flow path 31. Through the above structure, the heat transferred to the third connection part 313 can be transferred to the outer wall of the flow path 31. There is fluid flowing inside the flow path 31, so 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 transferred to the third connection part 313 and the heat of the motor 220 can be dissipated to the fluid.

[0139] The fourth connecting portion 314 extends in 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 connects the wall portion 322 having a surface intersecting the axial direction in a straight line from one side to the other side (front side to rear side). The fourth connecting portion 314 is located between the third convex portion 303 and the wall portion 321 having a surface along the axial direction, and extends in a straight line in the front and rear sides in the axial direction. Moreover, a part of the fourth connecting portion 314 is also connected to the wall portion 321 (323) having a surface along the axial direction on the front side of the substrate housing 213.

[0140] The connecting portion 310 further includes 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 is connected to one side and the other side of the wall portion 321 having a surface along the axial direction.

[0141] In the present embodiment, the substrate housing 213 of the housing 210 as the circuit substrate storage portion has a long side (first long side) in the axial direction and a short side (first short side) in the direction intersecting the axial direction (Y-axis direction), and is substantially rectangular when viewed from the opening side (-Z direction) of the substrate housing 213. The circuit substrate 40 has a long side (second long side) in the axial direction and a short side (second short side) in the direction intersecting the axial direction (Y-axis direction), and is in the shape of a rectangular plate. The circuit substrate 40 enters the substrate housing 213 from the opening of the substrate housing 213, and is fixed to the motor 220, the pump mechanism 30, and the partition wall 330 side from the opening side of the substrate housing 213 via screws. The substrate housing 213 has a screw hole 2133 for tightening the screw that fixes the circuit substrate 40. In the present embodiment, the screw hole 2133 of the substrate housing 213 is formed in the cylinder 2132 protruding from the partition wall 330 to the opening side of the substrate housing 213.

[0142] In this embodiment, the first to fifth connection parts 311 to 315 are lattice-shaped when viewed from the opening side of the substrate housing 213 in the +Z direction. Figure 7 As shown, in the case where the axial direction is the longitudinal direction, in the substrate housing 213 as the circuit substrate storage portion, the first connection portion 311 extends axially near the center and is connected to the first convex portion 301 and the second convex portion 302 overlapping the motor 220 and the fourth convex portion 304 overlapping the pump mechanism 30. The fourth connection portion 314 extends axially between the third convex portion 303 and the wall portion 320 and is connected from one side of the wall portion 322 having a surface intersecting the axial direction to the other side. The second connection portion 312, the third connection portion 313 and the fifth connection portion 315 are connected from one side of the wall portion 321 having a surface along the axial direction to the other side in a manner intersecting the first connection portion 311 extending in the axial direction and the two fourth connection portions 314. Of the distances from the first convex portion 301 and the second convex portion 302 to the wall portion 320 of the first connection portion 311 and the second connection portion 312, the distance of the second connection portion 312 is shorter.

[0143] The cylindrical portion 2132 is provided at the wall portion 320 , in the middle of the first to fifth connecting portions 311 to 315 , or at a location where any of the first to fifth connecting portions 311 to 315 intersect each other.

[0144] <Effect>

[0145] The convex portion 300 of the housing 210 overlaps with the motor 220 and the heat generating component 43 of the circuit substrate 40 in the following manner. That is, when the second surface 412 of the circuit substrate 40 faces the motor 220 and the pump mechanism 30 and is assembled in the substrate housing 213, the motor 220, the convex portion 300, the heat dissipation component 51, the circuit substrate 40 and the heat generating component 43 are connected in order from the center axis J to the radial outside. Moreover, when observed from a cross section along the axial direction, the motor 220, the convex portion 300 and the heat generating component 43 overlap in the radial direction (from the center axis J to the radial outside). Moreover, when observed from a cross section orthogonal to the axial direction, the motor 220, the convex portion 300 and the heat generating component 43 overlap in the radial direction (from the center axis J to the radial outside). Whether when observed from a cross section along the axial direction or when observed from a cross section orthogonal to the axial direction, the center parts of the motor 220, the convex portion 300 and the heat generating component 43 do not need to overlap each other, and even if the center parts of each are to be consistent, at least a part of them can be overlapped. Through the above structure, the protrusion 300 receives the heat of the heat-generating component 43 and the heat of the motor 220, and can dissipate the heat of the heat-generating component 43 and the motor 220. The protrusion 300 that receives the heat can dissipate the heat to the outside from the side that is not connected to the heat-generating component 43. The protrusion 300 can not only dissipate the heat of the heat-generating component 43, but also dissipate the heat of the motor 220, so the heat dissipation is excellent. Due to the excellent heat dissipation, for example, the motor 220 can work in a high-output state for a longer time. Moreover, high-output operation can be performed without enlarging the size of the motor 220. In the case of poor heat dissipation, for example, the heat-generating component 43 and the motor 220 may reach the upper limit temperature of the specification and be destroyed.

[0146] Furthermore, the circuit substrate 40 may be assembled to the substrate housing 213 in such a manner that the first surface 411 faces the motor 220 and the pump mechanism 30. In this case, in a cross section observed along the axial direction, the motor 220, the convex portion 300, and the heat generating component 43 are connected and overlapped in this order from the central axis J toward the radially outer side. The convex portion 300 is in contact with the resin surface 435 of the heat generating component 43 facing the same direction as the first surface of the circuit substrate 40. Furthermore, a heat dissipation component 51 may be sandwiched between the convex portion 300 and the heat generating component 43.

[0147] The material of the housing 210 may be metal or resin. When the housing 210 is made of metal, for example, by using a heat dissipation component 51 whose base material is made of silicone, the heat dissipation component 51 is sandwiched between the second surface 412 of the circuit substrate 40 and the convex portion 300 of the housing 210, so that the circuit substrate 40 and the housing 210 can be insulated. When the housing 210 is formed of resin, it does not need to be formed by one component, and it can also be appropriately integrally molded with a metal component. The motor housing 211 and the substrate housing 213 can also be formed of resin, and the pump housing 212 is set to be made of metal, and the housing 210 is made by integral molding. Moreover, only the convex portion 300 can be set to be made of metal or resin.

[0148] The housing 210 has a connecting portion 310 that connects the convex portion 300 and the wall portion 320. By having the connecting portion 310, the heat received by the convex portion 300 from the heat generating component 43 and the motor 220 can be dissipated to the wall portion 320 via the connecting portion 310. The wall portion 320 has an outer surface facing the outside of the housing 210, so the heat transferred from the connecting portion 310 can be dissipated to the outside of the outer surface. That is, the heat of the heat generating component 43 and the motor 220 can be dissipated from the electric oil pump 200 to the outside. In addition, depending on the installation environment, the outside of the housing 210 (electric oil pump 200) has various situations such as the other party such as the installed body, external gas (air, gas, etc.), oil (cooling oil, lubricating oil, grease) or other fluids. The heat transferred to the wall portion 320 is dissipated to the other party, external gas, oil or other fluids, so that the heat of the heat generating component 43 and the motor 220 can be dissipated from the electric oil pump 200.

[0149] The housing 210 has a partition wall 330 that separates the motor housing 211 as a motor housing portion and the substrate housing 213 as a circuit substrate housing portion. The partition wall 330 is in contact with the outer periphery of the stator 23 of the motor 220. The partition wall 330 is in contact over the entire axial range of the motor 220. By connecting the convex portion 300 protruding from the partition wall 330 to the connecting portion 310 in the axial direction, the heat of the motor 220 can be received over the entire axial direction of the motor 220, and excellent heat dissipation is achieved.

[0150] The connecting portion 310 includes a first connecting portion 311 extending from the convex portion 300 in the axial direction and a second connecting portion 312 extending from the convex portion 300 in a direction intersecting the axial direction. With the above structure, heat can be transferred to multiple locations of the wall portion 320. Since heat can be transferred to multiple locations of the wall portion 320, heat dissipation is excellent. Moreover, since the first connecting portion 311 extending in the axial direction overlaps with the motor 220, the heat of the motor 220 can be dissipated not only to the convex portion 300 but also to the first connecting portion 311, and heat can be further dissipated. Moreover, since the second connecting portion 312 also overlaps with the motor 220, the heat of the motor 220 can also be dissipated to the second connecting portion 312, and heat can be further dissipated. The first connecting portion 311 extending in the axial direction dissipates 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 dissipates heat to the wall portion 321 having a surface along the axial direction. Therefore, since the housing 210 includes the first connection portion 311 and the second connection portion 312 , heat can be dissipated throughout the entire wall portion 320 , thereby achieving excellent heat dissipation.

[0151] The protrusion 300 has a first protrusion 301 protruding from the rear side of the partition 330 and a second protrusion 302 protruding from the partition 330 at the front side of the first protrusion 301. In addition, the circuit substrate 40 has a motor power output portion at the axial rear end, and has a motor drive circuit and a control portion in sequence from the motor power output portion to the front side. In the case of this embodiment, the first protrusion 301 receives heat from the transistor 431 constituting the motor drive circuit, and the second protrusion 302 receives heat from the microcomputer 432 that controls the power supply of the motor drive circuit. Through the plurality of protrusions 300, the plurality of heat-generating components 43 mounted on the circuit substrate 40 can dissipate heat to the first protrusion 301 and the second protrusion 302, respectively, and the heat dissipation is excellent.

[0152] Moreover, if Figure 5 As shown, the first convex portion 301 and the second convex portion 302 are arranged in parallel in the axial direction and overlap with the motor 220. Not only the first convex portion 301 but also the second convex portion 302 overlaps with the motor 220, so the motor 220 can dissipate heat to the first convex portion 301 and the second convex portion 302, and heat dissipation is excellent.

[0153] The convex portion 300 further includes a third convex portion 303 between the first convex portion 301 and the wall portion 320. Figure 8 As shown, the third protrusion 303 protrudes from the partition wall 330. The third protrusion 303 overlaps a part of the transistor 431 constituting the motor drive circuit and the motor 220. By further providing the third protrusion 303, the heat of the heat generating component 43 and the heat of the motor 220 can be further dissipated.

[0154] Furthermore, the first protrusion 301 protrudes from the center of the partition wall 330 in the Y-axis direction toward the opening side of the substrate housing 213 as the circuit substrate storage portion. The third protrusion 303 protrudes from the partition wall 330 between the first protrusion 301 and the wall portion 321 having a surface along the axial direction. That is, the third protrusion 303 is offset from the first protrusion 301 in the Y-axis direction and is located at a position closer to the outside of the substrate housing 213 than the first protrusion 301. Figure 8 , Fig. 9 As shown, the partition wall portion 330 is in an arc shape, and the closer the outer side of the partition wall portion 330 in the Y-axis direction is to the wall portion 320, the lower the position in the height direction of the protrusion 300 is. The third protrusion 303, which is offset from the partition wall portion 330 in the Y-axis direction and protrudes from the partition wall portion 330 compared to the first protrusion 301, protrudes from a position lower than the first protrusion 301, and has an end on the circuit substrate 40 side until the same height position as the first protrusion 301, so the volume is larger than the first protrusion 301. With the above structure, the volume of the third protrusion 303 can be increased, and the heat of the heat generating component 43 and the heat of the motor 220 can be further dissipated.

[0155] The third protrusion 303 is located between the first protrusion 301 and the wall portion 321 having a surface along the axial direction, and is connected to the second connection portion 312. Since the third protrusion 303 is connected to the second connection portion 312, it can dissipate the heat received from the heat generating component 43 and the motor 220 to the wall portion 321 having a surface along the axial direction.

[0156] The third protrusion 303 is located between the first protrusion 301 and the wall portion 321 having a surface along the axial direction, and is connected to the first protrusion 301 and the wall portion 321 having a surface along the axial direction through the second connection portion 312. The second connection portion 312 between the third protrusion 303 and the wall portion 321 having a surface along the axial direction protrudes from the partition wall portion 330 toward the circuit substrate 40 side. With respect to the size of the height direction of the protrusion 300 of the second connection portion 312, the size from the third protrusion 303 to the wall portion 321 having a surface along the axial direction is larger than the size from the first protrusion 301 to the third protrusion 303. Moreover, with respect to the size of the distance in the Y-axis direction of the second connection portion 312, the size from the third protrusion 303 to the wall portion 321 having a surface along the axial direction is larger than the size from the first protrusion 301 to the third protrusion 303. The heat received by the first convex portion 301 and the third convex portion 303 is transferred to the second connecting portion 312 and dissipated to the side of the wall portion 321 having a surface along the axial direction. The second connecting portion 312 close to the wall portion 321 having a surface along the axial direction, that is, the second connecting portion 312 between the third convex portion 303 and the wall portion 321 having a surface along the axial direction is larger than the second connecting portion 312 between the first convex portion 301 and the third convex portion 303, so the surface area is wide and the heat dissipation is excellent. Moreover, when the second connecting portion 312 is cut off by the surface along the axial direction, the size of the cross-sectional area between the third convex portion 303 and the wall portion 321 having a surface along the axial direction is large. Due to the large cross-sectional area, heat can be further dissipated to the wall portion 321 having a surface along the axial direction.

[0157] The connecting portion 310 has a third connecting portion 313 extending from the first connecting portion 311 in a direction intersecting the axial direction and connected to the wall portion 321 having a surface along the axial direction. The third connecting portion 313 receives the heat received by the first connecting portion 311 and can also dissipate the heat to the wall portion 321 having a surface along the axial direction, thereby achieving better heat dissipation.

[0158] The connection part 310 has a fourth connection part 314 extending axially from the second connection part 312 and connected to the wall surface 320. The fourth connection part 314 receives heat received by the second connection part 312 and can also dissipate heat to the wall surface 320, thereby achieving better heat dissipation.

[0159] The connection part 310 further includes a fifth connection part 315 connecting the second protrusion 302 and the wall part 321 having a surface along the axial direction. The fifth connection part 315 can dissipate the heat received by the second protrusion 302 to the wall part 321 having a surface along the axial direction.

[0160] The convex portion 300 may also be provided with a heat dissipation component 51 at the end portion on the circuit substrate 40 side, and receive the heat of the heat-generating component 43 via the heat dissipation component 51. Even in the case of a relatively small heat-generating component 43 relative to the end portion of the convex portion 300, by using the heat dissipation component 51, the heat can be received at the entire end portion of the convex portion 300, and the heat dissipation of the heat-generating component 43 is good. The heat dissipation component 51 may be provided at each convex portion 300, or a larger heat dissipation component 51 may be provided in common for the first connecting portion 311 to the third connecting portion 313 concentrated on the rear side. In addition, when the second surface 412 of the circuit substrate 40 is assembled toward the motor 220 side, heat can be transferred from the heat-generating component 43 to the heat dissipation component 51 via the substrate through hole (through hole) of the circuit substrate 40.

[0161] The first to fifth connection parts 311 to 315 may also be provided with a stepped shape. By appropriately providing each connection part 310 with a stepped shape, interference with electronic components such as capacitors mounted on the circuit board 40 can be avoided and heat received from the protrusion 300 can be dissipated to the wall part 320 .

[0162] The third receiving recess 213a of the substrate housing 213 may be filled with grease, resin material, silicone-based material, etc. in a manner extending from the convex portion 300 to the wall portion 320. By filling with grease, resin material, etc., the heat of the heat generating component 43 and the motor 220 can be dissipated from the electric oil pump 200 to the outside through not only the connecting portion 310 but also the filled grease, resin material, etc.

[0163] When the first surface 411 of the circuit substrate 40 is assembled toward 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 may be connected in this order from the central axis J toward the radially outer side. The resin surface 435 of the heat generating component 43 facing the same direction as the first surface 411 of the circuit substrate 40 may be connected to the convex portion 300 to dissipate heat to the convex portion 300.

[0164] The housing 210 is connected to the pump cover 212b that blocks the second storage recess 212a from the front side and the bearing holder 226 that blocks the first storage recess 211a from the rear side. Since the housing 210 is connected to the pump cover 212b and the bearing holder 226, the heat of the heat-generating component 43 and the motor 220 can be 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 the heat can be further dissipated from the outer surface of the pump cover 212b and the bearing holder 226 to the outside. By making the pump cover 212b and the bearing holder 226 into metal, the heat conduction is excellent and the heat dissipation is even better. Moreover, by also making the substrate cover 241, which is a part of the housing 210, into metal, the heat can be further dissipated. Moreover, the heat received by the convex portion 300 and the connecting portion 310 of this embodiment is not only dissipated to the outside from the outer surface of the wall portion 320. That is, since the substrate housing 213 having the wall portion 320 is a part of the housing 210, the heat received by the protrusion 300 and the connection portion 310 is transferred from the wall portion 320 to the entire housing 210 and can be dissipated over the entire outer surface of the housing 210. Since the heat is dissipated over the entire outer surface of the housing 210, excellent heat dissipation is achieved.

[0165] In the present embodiment, a method is described in which the surface of the substrate is along the axial direction and the motor 220, the protrusion 300 and the heat generating component 43 overlap in the radial direction, but the method is not limited thereto. The surface of the substrate may also be arranged in a direction intersecting the axial direction, or the motor 220, the protrusion 300 and the heat generating component 43 may overlap in the axial direction. That is, the method may be as follows: when observed from a cross section along the axial direction, the motor 220, the protrusion 300 and the heat generating component 43 overlap from one axial direction to the other axial direction, and when observed from a cross section orthogonal to the axial direction, the motor 220, the protrusion 300 and the heat generating component 43 overlap in the axial direction. When the motor 220, the protrusion 300 and the heat generating component 43 overlap in the axial direction, the partition wall portion 330 does not need to be in an arc shape, and may also have a recess and a hole.

[0166] In this embodiment, the circuit substrate 40 is housed in the substrate housing 213, and the convex portion 300 and the connecting portion 310 are provided on the substrate housing 213. However, the substrate cover 241 of the housing 210 may be provided in a box shape that is open toward the substrate housing 213 (+Z side), and the convex portion 300 and the connecting portion 310 may also be provided on the inner side of the substrate cover 241. By also providing the convex portion 300 and the connecting portion 310 on the substrate cover 241, the heat can be further dissipated.

[0167] In addition, the various structures (constituent elements) described in the above-mentioned embodiments, modified examples, and notes, etc. can be combined within the scope of not departing from the gist of the present invention, and addition, omission, replacement, and other changes of the structure can be made. In the present embodiment, the busbar unit 250 is configured to have a joint busbar holder 252, but it can also be configured not to include the joint busbar holder 252. In the present embodiment, a structure in which the second long side (long side) of the circuit substrate 40 is arranged in the axial direction is shown, but the second short side (short side) of the circuit substrate 40 can also be arranged in the axial direction. The circuit substrate 40 itself can also be miniaturized by designing the circuit structure, and the second long side (long side) of the circuit substrate 40 intersects with the axial direction to the extent that the electric oil pump 200 does not adversely affect the adjacent transmission, body-related components, and other mounted bodies of the automobile. Moreover, in the case where the second short side (short side) of the circuit substrate 40 is arranged in the axial direction, a plurality of circuit substrates 40 can also be provided, and the arrangement of the plurality of circuit substrates 40 can be designed to be miniaturized in the radial direction. For example, a plurality of circuit substrates 40 may be arranged in a state where the second short side (short side) is arranged in the axial direction within the range when the second long side (long side) of a circuit substrate 40 is arranged in the axial direction, or a plurality of circuit substrates 40 may be arranged in a state where the second short side (short side) is arranged in the axial direction so that the board surfaces overlap. In the present embodiment, a structure in which the mounting plate portion 70 includes a suction port 731, a discharge port 734, and a flow path 73 is shown, but it may also be configured not to include the suction port 731, the discharge port 734, and the flow path 73. For example, the circuit substrate 40 may be arranged toward the motor 220 side in a manner that the board surface does not overlap with the pump housing 212, and the suction port 731, the discharge port 734, and the flow path 73 are formed around the pump housing 212. In the present embodiment, a structure in which the mounting plate portion 70 has a mounting hole is shown, but mounting holes may also be provided at other locations of the outer housing 210.

Claims

1. An electric pump, comprising: a motor having a shaft rotatable about a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located radially outwardly and orthogonal to the axial direction of the shaft; and an outer shell capable of accommodating the motor and the circuit substrate, The circuit board has a board surface, the board surface being a first surface having electronic components along the axial direction and opposite to the axis, and a second surface on the opposite side of the first surface. The outer shell includes: a motor housing portion that accommodates the motor; a substrate housing portion that accommodates the circuit substrate; a pump housing portion that accommodates the pump mechanism; and a mounting plate portion that is located radially outwardly orthogonal to the axial direction of the shaft. The mounting plate portion has a mounting surface opposite to the shaft and along the axial direction, The motor and the pump mechanism are located on the inner corner side of the angle where the third surface including the plate surface and the fourth surface including the mounting surface intersect, The mounting plate portion has: a suction port for sucking fluid through the pump mechanism; and a discharge port for discharging fluid through the pump mechanism, The suction port is arranged to be offset in the axial direction relative to the discharge port when the mounting surface is viewed in a direction perpendicular to the fourth surface. The circuit substrate includes: a second long side along the axial direction; and a second short side intersecting the second long side and intersecting the fourth surface.

2. The electric pump according to claim 1, wherein: The substrate housing portion includes: a first long side along the axial direction; and a first short side intersecting the first long side and along the third surface.

3. The electric pump according to claim 1, wherein: The mounting plate portion has a thickness in a radial direction orthogonal to the axial direction of the shaft, The motor and the pump mechanism are arranged with the thickness interposed between them and the mounting surface.

4. The electric pump according to claim 1, wherein: The substrate housing portion has a connector portion for connecting to the outside. The connector portion extends from the substrate housing portion in the axial direction.

5. The electric pump according to claim 4, wherein: A plurality of bus bars electrically connecting the motor and the circuit board are provided, The busbar is connected to the end of the circuit substrate on the motor side, that is, on the other axial side. The connector portion extends from an end portion of the substrate housing portion on the pump mechanism side, that is, on one axial side.

6. The electric pump according to claim 1 or 3, wherein: The mounting plate portion has at least two mounting holes, The mounting hole comprises a first mounting hole and a second mounting hole, The first mounting hole is located axially outside the pump housing portion.

7. The electric pump according to claim 1 or 3, wherein: The mounting plate portion has at least two mounting holes, The mounting hole comprises a first mounting hole and a second mounting hole, The second mounting hole is located axially outside the motor housing portion.

8. The electric pump according to claim 6, wherein: At least one of the mounting holes is located between the upper end and the lower end of the outer shell when viewed from a direction orthogonal to the fourth surface.

9. The electric pump according to claim 1, wherein: The mounting plate portion has at least two mounting holes, The mounting hole has a first mounting hole on one axial side and a second mounting hole on the other axial side. The suction port and the discharge port are located between the first mounting hole and the second mounting hole.

10. The electric pump according to claim 9, wherein: The mounting plate portion has a third mounting hole, The suction port and the discharge port are located between the third mounting hole and the first mounting hole or the second mounting hole when viewed in the axial direction.

11. The electric pump according to claim 1, wherein: The mounting surface has: A suction port face portion surrounding the suction port; and A discharge port face portion surrounding the discharge port.

12. The electric pump according to claim 1, wherein The mounting plate portion has a flow path through which the fluid sucked in and discharged by the pump mechanism flows.

13. The electric pump according to claim 12, wherein: The flow path includes a suction flow path and a discharge flow path extending radially from the mounting surface and connected to the pump mechanism side. The suction flow path is located between the discharge flow path and the motor in the axial direction when viewed in a direction perpendicular to the fourth surface.

14. The electric pump according to claim 12, wherein: The flow path has: a discharge flow path extending radially from the mounting surface and connected to the pump mechanism; a first suction flow path extending radially from the mounting surface to the shaft side; a second suction flow path connected to the first suction flow path and passing through the mounting plate portion in an axial direction; as well as a third suction flow path connected to the second suction flow path, extending in a radial direction and connected to the pump mechanism, The third suction flow path is located between the discharge flow path and the first suction flow path in the axial direction when viewed in a direction perpendicular to the fourth surface.

15. The electric pump according to claim 12, wherein: The flow path has: a suction flow path connected from the suction port to the pump mechanism side; a discharge flow path connected from the discharge port to the pump mechanism side; as well as A pressure relief flow path is branched from the discharge flow path and is used to return the fluid to the suction flow path side.

16. The electric pump according to claim 15, wherein: At least a portion of the suction flow path overlaps the pressure relief flow path in a direction intersecting the axial direction when viewed in a direction along the fourth surface.

17. The electric pump according to claim 1, wherein: The mounting plate portion is located between a lower end of the substrate housing portion and upper ends of the motor housing portion and the pump housing portion when viewed in a direction perpendicular to the fourth surface.

18. An electric pump comprising: a motor having a shaft rotatable about a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located radially outwardly and orthogonal to the axial direction of the shaft; and an outer shell capable of accommodating the motor and the circuit substrate, The circuit board has a board surface, the board surface being a first surface having electronic components along the axial direction and opposite to the axis, and a second surface on the opposite side of the first surface. The outer shell includes: a motor housing portion that accommodates the motor; a substrate housing portion that accommodates the circuit substrate; a pump housing portion that accommodates the pump mechanism; and a mounting plate portion that is located radially outwardly orthogonal to the axial direction of the shaft. The mounting plate portion has a mounting surface opposite to the shaft and along the axial direction, The motor and the pump mechanism are located on the inner corner side of the angle where the third surface including the plate surface and the fourth surface including the mounting surface intersect, The mounting plate portion has: a suction port for sucking fluid through the pump mechanism; and a discharge port for discharging fluid through the pump mechanism, The suction port is arranged to be offset in the axial direction relative to the discharge port when the mounting surface is viewed in a direction perpendicular to the fourth surface. The mounting plate portion has at least two mounting holes, The mounting hole comprises a first mounting hole and a second mounting hole, The first mounting hole is located axially outside the pump housing portion.

19. An electric pump comprising: a motor having a shaft rotatable about a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located radially outwardly and orthogonal to the axial direction of the shaft; and an outer shell capable of accommodating the motor and the circuit substrate, The circuit board has a board surface, the board surface being a first surface having electronic components along the axial direction and opposite to the axis, and a second surface on the opposite side of the first surface. The outer shell includes: a motor housing portion that accommodates the motor; a substrate housing portion that accommodates the circuit substrate; a pump housing portion that accommodates the pump mechanism; and a mounting plate portion that is located radially outwardly orthogonal to the axial direction of the shaft. The mounting plate portion has a mounting surface opposite to the shaft and along the axial direction, The motor and the pump mechanism are located on the inner corner side of the angle where the third surface including the plate surface and the fourth surface including the mounting surface intersect, The mounting plate portion has: a suction port for sucking fluid through the pump mechanism; and a discharge port for discharging fluid through the pump mechanism, The suction port is arranged to be offset in the axial direction relative to the discharge port when the mounting surface is viewed in a direction perpendicular to the fourth surface. The mounting plate portion has at least two mounting holes, The mounting hole comprises a first mounting hole and a second mounting hole, The second mounting hole is located axially outside the motor housing portion.

20. An electric pump comprising: a motor having a shaft rotatable about a central axis; a pump mechanism connected to one axial side of the shaft; a circuit substrate located radially outwardly and orthogonal to the axial direction of the shaft; and an outer shell capable of accommodating the motor and the circuit substrate, The circuit board has a board surface, the board surface being a first surface having electronic components along the axial direction and opposite to the axis, and a second surface on the opposite side of the first surface. The outer shell includes: a motor housing portion that accommodates the motor; a substrate housing portion that accommodates the circuit substrate; a pump housing portion that accommodates the pump mechanism; and a mounting plate portion that is located radially outwardly orthogonal to the axial direction of the shaft. The mounting plate portion has a mounting surface opposite to the shaft and along the axial direction, The motor and the pump mechanism are located on the inner corner side of the angle where the third surface including the plate surface and the fourth surface including the mounting surface intersect, The mounting plate portion has: a suction port for sucking fluid through the pump mechanism; and a discharge port for discharging fluid through the pump mechanism, The suction port is arranged to be offset in the axial direction relative to the discharge port when the mounting surface is viewed in a direction perpendicular to the fourth surface. The mounting plate portion has at least two mounting holes, The mounting hole has a first mounting hole on one axial side and a second mounting hole on the other axial side. The suction port and the discharge port are located between the first mounting hole and the second mounting hole.

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