Rotating electric machines and pumps

Abstract

To achieve both of electromagnetic noise reduction and weight reduction of rotary electric machine.SOLUTION: A rotary electric machine comprises: a rotor 20 which is rotatable around a rotation axis J; a stator 30 which is opposed to the rotor while interposing a gap in a radial direction; a circuit board 70 disposed at one side of the stator in an axial direction; and a housing 10 which houses the rotor, the stator and the circuit board. The housing includes: a main body part 11 including an opening 11b at one side in the axial direction; and a cover member 12 closing the opening. The cover member includes: a resin cover main body part 13; a metallic shield member 80 fixed onto a surface directed to the other side in the axial direction, of the cover main body part, and disposed at one side of the circuit board in the axial direction; a conductive member 85 which is held by the cover main body part and having conductivity; and a contact member which is held by the cover main body part and brought into contact with a mounting object and has conductivity. The conductive member is electrically connected with the shield member and the contact member. The circuit board is electrically connected with the shield member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine and a pump. [Background technology]

[0002] There are known measures to reduce electromagnetic noise emitted from motors. For example, Patent Document 1 describes a configuration in which a metal shielding plate is attached to cover the outer periphery of the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-261483 Summary of the Invention [Problem to be solved by the invention]

[0004] In the motor described above, the entire outer periphery of the motor needs to be covered with a metal shielding plate, which makes it impossible to reduce the size of the shielding plate and therefore the weight of the motor.

[0005] In view of the above circumstances, one aspect of the present invention has an object to provide a rotating electrical machine and a pump that can reduce the weight while reducing electromagnetic noise emitted to the outside. [Means for solving the problem]

[0006] One aspect of the rotating electric machine of the present invention is a rotating electric machine to be attached to an object, the rotating electric machine comprising: a rotor rotatable about a central axis; a stator radially opposed to the rotor with a gap therebetween; a circuit board disposed on one axial side of the stator; and a housing accommodating the rotor, the stator, and the circuit board. The housing has a main body portion having an opening on one axial side and a cover member closing the opening. The cover member includes a resin cover main body portion, a metal shielding member fixed to a surface of the cover main body facing the other axial side and disposed on one axial side of the circuit board, a conductive member held in the cover main body, and a conductive contact member held in the cover main body and in contact with the object. The conductive member is electrically connected to the shielding member and the contact member. The circuit board is electrically connected to the shielding member.

[0007] One aspect of the pump of the present invention includes the above rotating electric machine and a pump mechanism connected to the above rotor. [Effects of the Invention]

[0008] According to one aspect of the present invention, in a rotating electrical machine and a pump, it is possible to reduce the electromagnetic noise radiated to the outside and to reduce the weight thereof. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a pump according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a pump according to one embodiment. [Figure 3] FIG. 3 is a perspective view showing a cover member and a shielding member according to an embodiment. [Figure 4] FIG. 4 is a perspective view showing a portion of a pump according to an embodiment. [Figure 5] FIG. 5 is an exploded perspective view showing a cover member according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] In the following description, the Y-axis is shown in the figures where appropriate. The Y-axis indicates the direction in which the central axis J of the shaft in the embodiments described below extends. The central axis J shown in each figure is a virtual axis. In the following description, the direction in which the central axis J extends, i.e., the direction parallel to the Y-axis, will be referred to as the "axial direction." The radial direction centered on the central axis J will be simply referred to as the "radial direction." The circumferential direction centered on the central axis J will be simply referred to as the "circumferential direction." The side of the axial direction toward which the Y-axis arrow points (+Y side) will be referred to as the "one axial side." The side of the axial direction opposite to the side toward which the Y-axis arrow points (-Y side) will be referred to as the "other axial side."

[0011] The circumferential direction is indicated by the arrow θ in each drawing. The side of the circumferential direction toward which the arrow θ points is called the "one circumferential side." The opposite side of the circumferential direction to the side toward which the arrow θ points is called the "other circumferential side." The one circumferential side is the side that advances clockwise around the central axis J when viewed from one axial side. The other circumferential side is the side that advances counterclockwise around the central axis J when viewed from one axial side.

[0012] In this embodiment, the contact member is a member that is held by the cover main body 13, that comes into contact with the attachment object 5, that is conductive, and that is electrically connected to the conductive member 85. Therefore, in this embodiment, the contact member is not limited to one member, but includes multiple contact members. As will be described later, this embodiment includes two contact members: a first contact member 84 and a second contact member 92. In the following description, the second contact member 92 may be referred to as a positioning pin 92.

[0013] The pump 1 of this embodiment shown in FIG. 1 is an electric pump attached to equipment mounted on a vehicle. The equipment to which the pump 1 is attached may be an automatic transmission or a drive unit that drives the axles of the vehicle. In the following description, the equipment to which the pump 1 is attached will be referred to as an attachment target 5. In this embodiment, the portion of the attachment target 5 to which the pump 1 is attached is made of metal. The pump 1 is, for example, an electric oil pump that supplies oil to equipment mounted on the vehicle.

[0014] 2, the pump 1 includes a rotating electric machine 2 and a pump mechanism 40. In this embodiment, the rotating electric machine 2 is a motor. The rotating electric machine 2 includes a housing 10, a rotor 20, a stator 30, a control device 7, and a sealing member 63.

[0015] The housing 10 accommodates the rotor 20, the stator 30, the control device 7, the sealing member 63, and the pump mechanism 40. The housing 10 has a main body 11, a cover member 12, a pump cover member 17, and a support member 18. The main body 11, the cover member 12, the pump cover member 17, and the support member 18 are separate members. The cover member 12 is disposed on one axial side of the main body 11. The pump cover member 17 is fixed to the other axial side of the main body 11. The support member 18 is fixed to one axial side of the main body 11. The support member 18 is disposed on the other axial side of the cover member 12.

[0016] As shown in FIG. 2, the main body 11 has a generally cylindrical shape extending in the axial direction about a central axis J. The main body 11 has a main body outer cylinder 11a, a pump mechanism accommodating portion 11c, a main body inner cylinder 11d, and a sealing member holding portion 11e. In this embodiment, the main body outer cylinder 11a, the pump mechanism accommodating portion 11c, the main body inner cylinder 11d, and the sealing member holding portion 11e are all part of the same single member. In this embodiment, the main body 11 is made of metal.

[0017] The main body outer cylinder portion 11a accommodates the rotor 20, the stator 30, and the sealing member 63 inside. The main body outer cylinder portion 11a is cylindrical and extends in the axial direction around the central axis J. One axial end of the main body outer cylinder portion 11a is the one axial end of the main body portion 11. The other axial end of the main body outer cylinder portion 11a is connected to the one axial end of the pump mechanism accommodating portion 11c. The main body outer cylinder portion 11a has an opening 11b that opens to one axial side at its one axial end. A groove is provided on the outer peripheral surface of the one axial side of the main body outer cylinder portion 11a, and an O-ring 68 is fitted into the groove.

[0018] When viewed in the axial direction, the opening 11b has a circular shape centered on the central axis J. A support member 18 and a cover member 12 are fixed to the opening 11b.

[0019] The pump mechanism accommodating portion 11c accommodates the pump mechanism 40 therein. The pump mechanism accommodating portion 11c is cylindrical and has a center on the central axis J, opening to the other axial side. A pump cover member 17 is fixed to the surface of the pump mechanism accommodating portion 11c facing the other axial side. The opening on the other axial side of the pump mechanism accommodating portion 11c is closed by the pump cover member 17.

[0020] The main body inner cylindrical portion 11d extends from the pump mechanism housing portion 11c to one side in the axial direction. The main body inner cylindrical portion 11d is cylindrical and extends in the axial direction around the central axis J. The main body inner cylindrical portion 11d is disposed inside the main body outer cylindrical portion 11a. A shaft 23, which will be described later, passes through the inside of the main body inner cylindrical portion 11d. The inner peripheral surface of the main body inner cylindrical portion 11d contacts the outer peripheral surface of the shaft 23 and supports the shaft 23.

[0021] The sealing member holding portion 11e is provided on one axial side of the main body inner cylindrical portion 11d. The sealing member holding portion 11e has a cylindrical shape centered on the central axis J. A sealing member 63 is held inside the sealing member holding portion 11e.

[0022] As shown in FIGS. 1 and 2, the cover member 12 is fixed to one axial side of the main body 11. The cover member 12 covers the opening 11b from one axial side. The cover member 12 has a generally cylindrical shape extending in the axial direction about a central axis J. The cover member 12 houses the control device 7 therein. The cover member 12 surrounds the control device 7 and the support member 18. The cover member 12 has a cover main body 13, a shielding member 80, a first contact member 84, a conductive member 85, a second contact member 92, and caps 65 and 66.

[0023] The cover main body 13 has a generally cylindrical shape extending in the axial direction about the central axis J. The cover main body 13 surrounds the control device 7 and the support member 18. In this embodiment, the cover main body 13 is made of resin. The cover main body 13 has a lid portion 13a, a first tubular portion 13j, a cylindrical portion 14, a flange portion 15, and claw portions 16. In this embodiment, the lid portion 13a, the first tubular portion 13j, the cylindrical portion 14, the flange portion 15, and the claw portions 16 are all part of the same single member. In this embodiment, the cover main body 13 is made by insert molding using the first contact member 84, the conductive member 85, and the second contact member 92 as insert members.

[0024] 2 and 3, the cover portion 13a is generally disk-shaped and centered on the central axis J. The cover portion 13a is disposed on one axial side of the circuit board 70, which will be described later. As shown in FIG. 1, the cover portion 13a has a flat portion 13b, a box-shaped portion 13c, a connector accommodating portion 13e, and a plurality of ribs 13g.

[0025] As shown in FIGS. 2 and 3, the flat portion 13b has a substantially circular plate shape centered on the central axis J. The plate surface of the flat portion 13b faces the axial direction. The flat portion 13b faces the circuit board 70 in the axial direction. A first shielding portion 81 of the shielding member 80, which will be described later, is fixed to the surface of the flat portion 13b facing the other axial side, and a third shielding portion 83 is also disposed thereon. The flat portion 13b is provided with a recess 13d, a through-hole 13f, and a first protrusion 13n.

[0026] As shown in Fig. 3, the recesses 13d are provided on the surface of the flat surface portion 13b facing the other axial side. The recesses 13d are provided on the arc-shaped outer edge portion of the flat surface portion 13b. The recesses 13d are provided at intervals along the circumferential direction. In this embodiment, three recesses 13d are provided.

[0027] The through hole 13f is a hole that penetrates the flat surface portion 13b in the axial direction. When viewed in the axial direction, the through hole 13f is a hole that is approximately rectangular cylindrical. The other axial end of the through hole 13f is connected to a surface of the flat surface portion 13b that faces the other axial side. The one axial end of the through hole 13f is connected to a surface of the connector accommodating portion 13e, which will be described later, that faces one axial side. In other words, the through hole 13f is a hole that penetrates the flat surface portion 13b and the connector accommodating portion 13e in the axial direction. A connector member 72, which will be described later, is arranged inside the through hole 13f.

[0028] The first protrusions 13n secure the flat surface 13b to a first shielding portion 81 of the shielding member 80, which will be described later. As shown in FIG. 5, the first protrusions 13n are cylindrical and protrude from the flat surface 13b toward the other axial direction. As shown in FIG. 3, the first protrusions 13n are spaced apart along the circumferential direction. In this embodiment, four first protrusions 13n are provided. Adjacent first protrusions 13n are arranged with a recess 13d sandwiched between them in the circumferential direction. As shown in FIG. 5, in the process of securing the shielding member 80 to the surface facing the other axial side of the cover main body 13, the first protrusions 13n are passed through a through-hole 81e that penetrates the first shielding portion 81 in the axial direction. As shown in FIG. 3, the portion of the first protrusion 13n on the other axial side is melted and spread by a welding machine (not shown). As a result, the first shielding portion 81 is secured to the surface facing the other axial side of the flat surface 13b by welding.

[0029] As shown in Figures 2 and 3, the box-shaped portion 13c has a generally rectangular box shape that protrudes from the flat portion 13b to one side in the axial direction. The box-shaped portion 13c is open to the other side in the axial direction. The interior of the box-shaped portion 13c is connected to the interior of the first cylindrical portion 13j. A central axis J passes through the box-shaped portion 13c. A second shielding portion 82 of the shielding member 80, which will be described later, is fixed to the inner surface of the box-shaped portion 13c. The box-shaped portion 13c has a peripheral wall portion 13h that protrudes from the flat portion 13b to one side in the axial direction, and an upper wall portion 13i that is located on one side of the peripheral wall portion 13h in the axial direction.

[0030] The peripheral wall portion 13h has a generally square cylindrical shape and protrudes from the flat portion 13b to one side in the axial direction. The inner surface of the peripheral wall portion 13h contacts a side wall portion 82a of the second shielding portion 82, which will be described later. The peripheral wall portion 13h surrounds the periphery of the first electronic component 71a, which will be described later.

[0031] The upper wall portion 13i has a substantially square plate shape when viewed in the axial direction. The plate surface of the upper wall portion 13i faces the axial direction. The upper wall portion 13i is connected to one axial end of the peripheral wall portion 13h. The upper wall portion 13i is disposed on one axial side of the first electronic component 71a. A portion of a top wall portion 82b of a second shielding portion 82, which will be described later, is fixed to a surface of the upper wall portion 13i facing the other axial side. A second protrusion 13p is provided on the upper wall portion 13i.

[0032] The second protrusions 13p secure the upper wall portion 13i to a second shielding portion 82 of the shielding member 80, which will be described later. As shown in FIG. 5, the second protrusions 13p are cylindrical and protrude from the upper wall portion 13i toward the other axial direction. As shown in FIG. 3, in this embodiment, three second protrusions 13p are provided. When viewed in the axial direction, the second protrusions 13p are arranged such that three straight lines connecting the second protrusions 13p form a triangle. Note that the second protrusions 13p may also be arranged linearly. As shown in FIG. 5, in the process of securing the shielding member 80 to the surface facing the other axial side of the cover main body 13, the second protrusions 13p are passed through through-holes 82c that penetrate the second shielding portion 82 in the axial direction. As shown in FIG. 3, the other axial side portion of the second protrusions 13p is melted and spread by a welding machine (not shown). As a result, the second shielding portion 82 is fixed by welding to the surface of the box-shaped portion 13c facing the other axial side.

[0033] As shown in FIG. 1, the connector accommodating portion 13e protrudes in one axial direction from the surface of the flat portion 13b facing in one axial direction. The connector accommodating portion 13e has a generally rectangular cylindrical shape that opens in one axial direction. As described above, the interior of the connector accommodating portion 13e opens into the interior of the first cylindrical portion 13j via the through-hole 13f. A connector member 72 is disposed inside the connector accommodating portion 13e.

[0034] The plurality of ribs 13g protrude from the flat portion 13b to one side in the axial direction. The plurality of ribs 13g extend parallel to one another in a direction perpendicular to the axial direction. In the axial direction, the end portion of each rib 13g on one side in the axial direction is located at the same position as the surface on one side in the axial direction of the upper wall portion 13i. Of the plurality of ribs 13g, some of the ribs 13g are connected to the outer peripheral surface of the peripheral wall portion 13h. By providing the plurality of ribs 13g, the rigidity of the resin cover main body portion 13 can be increased.

[0035] As shown in FIG. 2, the first cylindrical portion 13j has a generally cylindrical shape extending in the axial direction around the central axis J. The first cylindrical portion 13j surrounds the circuit board 70, the support member 18, and one axial side of the stator 30. The one axial end of the first cylindrical portion 13j is connected to the radially outer end of the cover portion 13a. The inner circumferential surface of the other axial side of the first cylindrical portion 13j is fitted with the outer circumferential surface of the main body outer tubular portion 11a. This fixes the cover member 12 to the main body 11. The inner circumferential surface of the first cylindrical portion 13j is provided with a stepped surface 13k. The stepped surface 13k faces the other axial side. The stepped surface 13k contacts the surface of the first annular portion 18a of the support member 18 (described later) facing the one axial side. A groove is provided on the outer circumferential surface of the first cylindrical portion 13j, and an O-ring 67 is fitted into the groove.

[0036] As shown in FIGS. 1 and 2, the cylindrical portion 14 has a cylindrical shape centered on the central axis J. The cylindrical portion 14 is disposed radially outward from the first cylindrical portion 13j. One axial side portion of the inner peripheral surface of the cylindrical portion 14 is connected to the outer peripheral surface of the first cylindrical portion 13j via a plurality of ribs. As shown in FIG. 3, the other axial side portion of the inner peripheral surface of the cylindrical portion 14 is directly connected to the outer peripheral surface of the first cylindrical portion 13j.

[0037] As shown in FIGS. 1 and 2, the flange portion 15 protrudes radially outward from the cylindrical portion 14. When viewed in the axial direction, the flange portion 15 has a generally triangular shape with one corner protruding radially outward. A hole 15d is provided in the flange portion 15, penetrating the flange portion 15 in the axial direction. A first contact member 84, described later, is embedded in the inner circumferential surface of the hole 15d. The flange portions 15 are provided at intervals along the outer circumferential surface of the cylindrical portion 14. In this embodiment, three flange portions 15 are provided. The flange portions 15 include a first flange portion 15a, a second flange portion 15b, and a third flange portion 15c. As shown in FIG. 3, the first flange portion 15a is located closest to the box-shaped portion 13c among the three flange portions 15. The second flange portion 15b is located adjacent to the other circumferential side of the first flange portion 15a. The third flange portion 15c is located adjacent to one circumferential side of the first flange portion 15a.

[0038] 1 and 3, first flange portion 15a is provided with conductive member holding portion 15g. Second flange portion 15b and third flange portion 15c are not provided with conductive member holding portions. A portion of conductive member 85 and a positioning pin 92 are embedded and held inside first flange portion 15a. Second flange portion 15b and third flange portion 15c are not provided with conductive members or positioning pins.

[0039] 1 and 2, the conductive member holding portion 15g connects the inner circumferential surface of the hole 15d and the outer circumferential surface of the first cylindrical portion 13j. The conductive member holding portion 15g extends in the radial direction. A conductive member 85 and a positioning pin 92 are embedded and held inside the conductive member holding portion 15g. A cap 66 (described later) is fixed to a surface of the conductive member holding portion 15g facing one axial side.

[0040] As shown in FIG. 2 , the positioning pin 92 has a cylindrical shape extending in the axial direction. One axial side of the positioning pin 92 is embedded and held inside the conductive member holding portion 15g. The positioning pin 92 is disposed radially inward of the first contact member 84. The other axial side of the positioning pin 92 protrudes from the first flange portion 15a to the other axial side and is fitted into a hole 5b of the attachment target 5. In other words, the positioning pin 92 contacts the attachment target 5. This determines the circumferential and radial positions of the pump 1 relative to the attachment target 5. The one axial side of the positioning pin 92 is passed through a through hole 85d of the conductive member 85, which will be described later. The outer peripheral surface of the positioning pin 92 contacts the inner peripheral surface of the through hole 85d. The positioning pin 92 is conductive. In this embodiment, the positioning pin 92 is made of metal. In other words, the positioning pin 92 is electrically connected to the conductive member 85. As described above, in this embodiment, the contact member is a member that is held by the cover body 13, that comes into contact with the attachment object 5, that is conductive, and that is electrically connected to the conductive member 85. Therefore, in this embodiment, the positioning pin 92 is one of the contact members. In other words, the contact member has a second contact member 92.

[0041] As shown in Figures 2 and 3, the claws 16 protrude from the other axial end of the first cylindrical portion 13j to the other axial side. The claws 16 are provided at intervals along the circumferential direction. In this embodiment, 14 claws 16 are provided. The other axial side portions of the claws 16 are bent radially inward. The other axial side ends of the claws 16 hook onto protrusions 11j provided on the outer peripheral surface of the main body outer cylindrical portion 11a. This determines the position of the cover member 12 relative to the main body portion 11 in the axial direction.

[0042] As shown in FIG. 1 , the cap 65 is provided on a surface of the lid portion 13a facing one axial direction. The cap 65 is fixed to the hole 13r. The cap 65 closes the hole 13r from one axial direction. The cap 66 is provided on a surface of the first flange portion 15a facing one axial direction. The cap 66 is fixed to the hole 13s. The cap 66 closes the hole 13s from one axial direction. The hole 13r extends from the surface of the lid portion 13a facing one axial direction to the other axial direction and reaches the conductive member 85 (described later). The hole 13s extends from the surface of the first flange portion 15a facing one axial direction to the other axial direction and reaches the conductive member 85. As described above, the cover main body 13 is formed by insert molding using the conductive member 85 and the like as insert members. The conductive member 85 is held in place by a mold retaining pin during molding of the cover member 12. Holes 13r and 13s are portions through which retaining pins were passed. Cap 65 closes hole 13r, thereby preventing foreign matter such as oil and dust from entering hole 13r. Similarly, cap 66 closes hole 13s, thereby preventing foreign matter such as oil and dust from entering hole 13s.

[0043] As shown in Figures 1 and 2, the pump cover member 17 is fixed to the other axial side of the pump mechanism housing portion 11c with bolts. The pump cover member 17 has an inlet hole 17a and a discharge hole 17c. The inlet hole 17a is a hole that connects the interior of the pump mechanism housing portion 11c to the other axial end of the pump cover member 17. Oil is drawn into the interior of the pump mechanism housing portion 11c through the inlet hole 17a. The discharge hole 17c is a hole that penetrates the pump cover member 17 in the axial direction. The pump 1 discharges oil to the outside through the discharge hole 17c. A groove is provided on the outer peripheral surface of the pump cover member 17, and an O-ring 69 is fitted into the groove.

[0044] As shown in Figures 2 and 4, the support member 18 supports the circuit board 70 from the other axial side. The support member 18 has a substantially cylindrical shape centered on the central axis J. The support member 18 is disposed on one axial side of the stator 30. The support member 18 is disposed on the other axial side of the circuit board 70. The support member 18 is disposed inside the main body outer cylinder portion 11a. The support member 18 surrounds the one axial end of the shaft 23. The support member 18 is fixed to the opening 11b of the main body outer cylinder portion 11a. The support member 18 is made of resin. The support member 18 has a first annular portion 18a, a second cylindrical portion 18b, and a second annular portion 18c. The first annular portion 18a, the second cylindrical portion 18b, and the second annular portion 18c are all part of the same single member.

[0045] The second cylindrical portion 18b has a cylindrical shape centered on the central axis J. Ribs 18h are provided on the outer peripheral surface of the second cylindrical portion 18b. The ribs 18h protrude radially outward from the outer peripheral surface of the second cylindrical portion 18b and extend in the axial direction. The ribs 18h are provided at equal intervals along the circumferential direction. In this embodiment, six ribs 18h are provided. The radially outward surface of each rib 18h is fitted into the inner peripheral surface of the main body outer cylindrical portion 11a. This fixes the support member 18 to the main body portion 11.

[0046] The first annular portion 18a is in the shape of an annular plate centered on the central axis J. The first annular portion 18a protrudes radially outward from one axial end of the second cylindrical portion 18b. The plate surface of the first annular portion 18a faces the axial direction. The surface of the first annular portion 18a facing one axial end is in contact with the stepped surface 13k of the cover member 12. The surface of the first annular portion 18a facing the other axial end is in contact with one axial end of the main body outer cylindrical portion 11a. These determine the position of the support member 18 in the axial direction.

[0047] The second annular portion 18c has an annular plate shape centered on the central axis J. The second annular portion 18c surrounds one axial end of the shaft 23. The plate surface of the second annular portion 18c faces the axial direction. The radially outer end of the second annular portion 18c is connected to the other axial end of the second cylindrical portion 18b. The second cylindrical portion 18b has a hole 18d and a protrusion 18e. The hole 18d is a circular hole centered on the central axis J. The hole 18d passes through the second annular portion 18c in the axial direction. The shaft 23 passes through the hole 18d.

[0048] As shown in FIG. 4, the protrusions 18e are cylindrical and extend from the second annular portion 18c toward one side in the axial direction. The protrusions 18e are spaced apart along the circumferential direction. In this embodiment, three protrusions 18e are provided. Each protrusion 18e includes a first portion 18f and a second portion 18g. Each first portion 18f is cylindrical and protrudes from the second annular portion 18c toward one side in the axial direction. Each second portion 18g is cylindrical and protrudes from the first portion 18f toward one side in the axial direction. The outer diameter of each second portion 18g is smaller than the outer diameter of each first portion 18f. The surface of each first portion 18f facing toward one side in the axial direction contacts the surface of the circuit board 70 facing toward the other side in the axial direction, thereby supporting the circuit board 70. This determines the position of the circuit board 70 in the axial direction. Each second portion 18g is passed through a hole 70a provided in the circuit board 70. One axial side portion of each second portion 18g is melted and spread by a welding machine (not shown), thereby fixing the support member 18 and the circuit board 70 together.

[0049] As shown in FIG. 2, the rotor 20 is rotatable about a central axis J. The rotor 20 has a rotor core 21, a magnet 22, and a shaft 23. The shaft 23 and the magnet 22 are fixed to the rotor core 21. The rotor 20 is supported by a main body inner cylindrical portion 11d that supports the shaft 23 so as to be rotatable about the central axis J. The shaft 23 is cylindrical and extends in the axial direction about the central axis J. The shaft 23 is disposed between the interior of the main body outer cylindrical portion 11a and the interior of the pump mechanism accommodating portion 11c.

[0050] The stator 30 faces the rotor 20 via a gap. The stator 30 is located radially outward of the rotor 20. The stator 30 has a stator core 31, an insulator (not shown), and a plurality of coils 32. The stator 30 is fixed to the inner circumferential surface of the main body outer cylinder portion 11a. The plurality of coils 32 are connected to a circuit board 70 via a bus bar (not shown). A current is supplied to the plurality of coils 32 via the circuit board 70.

[0051] The sealing member 63 is held on the inner circumferential surface of the sealing member holding portion 11e. The sealing member 63 is disposed on the other axial side of the rotor core 21. In this embodiment, the sealing member 63 is a lip seal having a lip portion on the radially inner side. The lip portion of the sealing member 63 contacts the outer circumferential surface of the shaft 23. In this way, the sealing member 63 seals between the shaft 23 and the main body portion 11.

[0052] As shown in FIG. 2, the pump mechanism 40 is accommodated inside the pump mechanism accommodating portion 11c. The pump mechanism 40 has an inner rotor 41 and an outer rotor 42. The inner rotor 41 is connected to a portion of the shaft 23 that protrudes into the pump mechanism accommodating portion 11c. This connects the pump mechanism 40 to the rotor 20. The inner rotor 41 is annular and surrounds the shaft 23. The outer rotor 42 is annular and surrounds the inner rotor 41. The inner rotor 41 and the outer rotor 42 are meshed with each other. Therefore, when the inner rotor 41 is rotated by the rotor 20, the outer rotor 42 also rotates.

[0053] The control device 7 is electrically connected to the plurality of coils 32. The control device 7 controls the current supplied to the plurality of coils 32. The control device 7 is disposed on one axial side of the stator 30. The control device 7 is disposed on the other axial side of the cover member 12 and a shielding member 80, which will be described later. As shown in FIG. 4 , the control device 7 has a circuit board 70, a plurality of electronic components 71, a connector member 72, a connection terminal 87, and a heat transfer member 90. In other words, the rotating electric machine 2 is equipped with the plurality of electronic components 71, the connection terminal 87, and the heat transfer member 90.

[0054] The circuit board 70 has a substantially annular plate shape centered on the central axis J. The circuit board 70 is disposed on one axial side of the stator 30. As shown in FIGS. 2 and 4 , a plurality of electronic components 71, a connector member 72, a connection terminal 87, and a heat transfer member 90 are attached to the circuit board 70.

[0055] A plurality of electronic components 71 are attached to the circuit board 70. The plurality of electronic components 71 are fixed to the circuit board 70 by soldering or the like. The plurality of electronic components 71 include a first electronic component 71a and a second electronic component 71b. In this embodiment, the first electronic component 71a is an electronic component such as a capacitor. The first electronic component 71a is fixed to a surface of the circuit board 70 facing one axial side. When viewed in the axial direction, the first electronic component 71a is arranged so as to overlap the upper wall portion 13i of the cover member 12 and a top wall portion 82b of a shielding member 80 (described later). The first electronic component 71a is arranged inside the box-shaped portion 13c of the cover member 12 and a second shielding portion 82 of the shielding member 80 (described later). In this embodiment, the second electronic component 71b is an electronic component such as a transistor. The second electronic component 71b is fixed to a surface of the circuit board 70 facing the other axial side. When viewed in the axial direction, the second electronic component 71b overlaps the flat portion 13b of the cover member 12 and a first shielding portion 81 of the shielding member 80, which will be described later. In this embodiment, the first electronic component 71a has a larger axial dimension than the second electronic component 71b. The first electronic component 71a may be the component with the largest axial dimension among the electronic components provided on the surface facing one axial side of the circuit board 70. Similarly, the second electronic component 71b may be the component with the largest axial dimension among the electronic components provided on the surface facing the other axial side of the circuit board 70.

[0056] In the present embodiment, it has been described that one first electronic component 71a is arranged on the surface of the circuit board 70 facing one axial side, and one second electronic component 71b is arranged on the surface of the circuit board 70 facing the other axial side. However, in addition to the first electronic component 71a, another electronic component having a smaller axial dimension than the first electronic component 71a may be arranged on the surface of the circuit board 70 facing one axial side. Similarly, in addition to the second electronic component 71b, another electronic component having a smaller axial dimension than the second electronic component 71b may be arranged on the surface of the circuit board 70 facing the other axial side.

[0057] The connector member 72 electrically connects the circuit board 70 to an external device (not shown) that supplies power to the rotating electric machine 2. As shown in FIGS. 1 and 4 , the connector member 72 is attached to one axial side of the circuit board 70. The connector member 72 protrudes to one axial side. In the axial direction, the end of the connector member 72 on one axial side is located on one axial side of the end of the first electronic component 71a on one axial side. The portion of the connector member 72 on one axial side is disposed inside the connector accommodating portion 13e of the cover member 12.

[0058] As shown in FIG. 4, the connection terminal 87 is attached to a surface of the circuit board 70 facing one axial side. The connection terminal 87 is in the form of an elastic leaf spring. In this embodiment, the connection terminal 87 is made of metal. The connection terminal 87 contacts the circuit board 70 and a surface of the first shielding portion 81 (described later) facing the other axial side. The connection terminal 87 is electrically connected to the ground portion of the circuit board 70. This electrically connects the circuit board 70 and the shielding member 80.

[0059] As shown in FIGS. 2 and 4 , the heat transfer member 90 is attached to a surface of the circuit board 70 facing one axial side. The heat transfer member 90 has a substantially rectangular parallelepiped shape. The surface of the heat transfer member 90 facing the other axial side contacts the surface of the circuit board 70 facing one axial side. The surface of the heat transfer member 90 facing the other axial side contacts the surface of the first shielding portion 81 (described later) facing the other axial side. In this embodiment, the heat transfer member 90 overlaps with the second electronic component 71b when viewed in the axial direction. As described above, the second electronic component 71b is an electronic component such as a transistor. When the rotating electric machine 2 is operating, the amount of heat generated by the transistor is greater than the amount of heat generated by other electronic components. Therefore, according to this embodiment, heat generated in the second electronic component 71b, such as a transistor, can be efficiently transferred to the heat transfer member 90.

[0060] The shielding member 80 shields electromagnetic noise emitted from the control device 7 and reduces electromagnetic noise emitted to the outside of the rotating electric machine 2 and the pump 1. As shown in FIG. 2 , the shielding member 80 is disposed on one axial side of the control device 7. That is, the shielding member 80 is disposed on one axial side of the circuit board 70. The shielding member 80 is fixed to a surface of the cover main body 13 facing the other axial side. The shielding member 80 is made of metal. In this embodiment, the shielding member 80 is made of ferritic stainless steel. The material of the shielding member 80 is not limited to the material of this embodiment, and various materials such as silicon steel can be used. In this embodiment, the shielding member 80 is plate-shaped. The shielding member 80 has a first shielding portion 81, a second shielding portion 82, and a third shielding portion 83. The first shielding portion 81, the second shielding portion 82, and the third shielding portion 83 are all part of the same single member.

[0061] As shown in FIGS. 3 and 5, the first shielding portion 81 is a portion of the shielding member 80 that is fixed to the flat surface portion 13b of the cover main body 13. The first shielding portion 81 is substantially semicircular. The plate surface of the first shielding portion 81 faces the axial direction. The surface of the first shielding portion facing one axial side is in contact with the surface of the flat surface portion 13b facing the other axial side. As shown in FIG. 4, the surface of the first shielding portion 81 facing the other axial side faces the circuit board 70. As shown in FIG. 2, the first shielding portion 81 overlaps with the second electronic component 71b when viewed in the axial direction. The first shielding portion 81 is disposed with a small gap between it and the circuit board 70 in the axial direction. As a result, the first shielding portion 81 is disposed relatively close to the second electronic component 71b in the axial direction. 3, the first shielding portion 81 has a base portion 81a, a first protruding portion 81b, and a second protruding portion 81c. The base portion 81a, the first protruding portion 81b, and the second protruding portion 81c are all part of the same single member.

[0062] The base 81a is a substantially semicircular portion of the first shielding portion 81. A portion of the arc-shaped outer edge of the base 81a is recessed radially inward and is located radially inward of the recess 13d. As shown in FIG. 4, the surface of the base 81a facing the other axial side comes into contact with the heat transfer member 90. That is, the heat transfer member 90 comes into contact with the shielding member 80. The base 81a has a through-hole 81e.

[0063] As shown in FIGS. 3 and 5, the through-hole 81e is a hole that penetrates the base portion 81a in the axial direction. When viewed in the axial direction, the through-hole 81e is circular. The through-hole 81e is provided in the arc-shaped outer edge portion of the first shielding portion 81. The through-holes 81e are provided at intervals along the circumferential direction. In this embodiment, four through-holes 81e are provided. A first protrusion 13n of the cover main body portion 13 passes through each through-hole 81e. As described above, the other axial side portion of the first protrusion 13n is melted and spread by a welding machine (not shown). As a result, the first shielding portion 81 is fixed to the flat portion 13b by welding.

[0064] As shown in FIG. 3, the first protrusion 81b is disposed axially opposite a portion of the flat portion 13b on one circumferential side of the box-shaped portion 13c. When viewed in the axial direction, the first protrusion 81b has a substantially rectangular shape. The first protrusion 81b protrudes from the base portion 81a. Although not shown, the surface of the first protrusion 81b facing the other axial side is in contact with the heat transfer member 90. According to this embodiment, as described above, the heat transfer member 90 can suitably transfer heat generated in the second electronic component 71b, such as a transistor, to the shielding member 80.

[0065] The second protrusion 81c is disposed axially opposite a portion of the flat portion 13b that is on the other circumferential side of the box-shaped portion 13c. When viewed in the axial direction, the second protrusion 81c has a substantially rectangular shape. The second protrusion 81c protrudes from the base portion 81a. As shown in FIG. 4 , a surface of the second protrusion 81c facing the other axial side contacts the connection terminal 87. This electrically connects the shielding member 80 to the circuit board 70 via the connection terminal 87. The shielding member 80 is electrically connected to the ground portion of the circuit board 70. Therefore, according to this embodiment, during the assembly of the rotating electric machine 2 and the pump 1, the shielding member 80 can be electrically connected to the circuit board 70 via the connection terminal 87 by fixing the cover member 12 to the main body 11 to which the control device 7 is fixed via the support member 18 in advance. Therefore, compared to electrically connecting the shielding member 80 and the circuit board 70 by a process such as soldering, the shielding member 80 and the circuit board 70 can be electrically connected more easily. Therefore, an increase in the number of steps required to assemble the rotating electric machine 2 and the pump 1 can be suppressed.

[0066] 3, the second shielding portion 82 is fixed to a surface of the box-shaped portion 13c of the cover main body 13 facing the other axial side. The second shielding portion 82 has a substantially rectangular box shape extending from the first shielding portion 81 to one axial side. The second shielding portion 82 has a side wall portion 82a and a top wall portion 82b. The side wall portion 82a and the top wall portion 82b are part of the same single member.

[0067] The side wall portion 82a contacts the inner surface of the peripheral wall portion 13h of the box-shaped portion 13c. The side wall portion 82a is a generally square tubular shape extending from the first shielding portion 81 to one side in the axial direction. A portion of the end portion on the other axial side of the side wall portion 82a is connected to a portion of the linear edge portion of the base portion 81a. The end portion on one axial side of the side wall portion 82a is connected to a ceiling wall portion 82b (described later). As shown in FIGS. 2 and 4, the side wall portion 82a surrounds the radial outside of the first electronic component 71a. In other words, the shielding member 80 has the side wall portion 82a that surrounds the radial outside of the first electronic component 71a.

[0068] As shown in FIGS. 2 and 3, the top wall portion 82b is fixed to the inner surface of the upper wall portion 13i of the box-shaped portion 13c. The top wall portion 82b has a substantially square plate shape when viewed in the axial direction. The plate surface of the top wall portion 82b faces the axial direction. The top wall portion 82b is disposed on one axial side of the first electronic component 71a. When viewed in the axial direction, the top wall portion 82b overlaps with the first electronic component 71a. As described above, when viewed in the axial direction, the first shielding portion 81 overlaps with the second electronic component 71b. In other words, when viewed in the axial direction, the multiple electronic components 71 and the shielding member 80 overlap. Furthermore, the top wall portion 82b is disposed on one axial side of the first electronic component 71a, relatively close to the first electronic component 71a. The top wall portion 82b has a through-hole 82c.

[0069] As shown in FIGS. 3 and 5 , the through holes 82c are holes that penetrate the top wall portion 82b in the axial direction. When viewed in the axial direction, the through holes 82c are circular. In this embodiment, three through holes 82c are provided. When viewed in the axial direction, the through holes 82c are arranged such that three straight lines connecting the through holes 82c form a triangle. The through holes 82c may also be arranged in a linear fashion. A second protrusion 13p of the cover main body 13 passes through each through hole 82c. As described above, the other axial side of the second protrusion 13p is melted and spread by a welding machine (not shown). This allows the second shielding portion 82 to be fixed to the box-shaped portion 13c of the cover main body 13 by welding. As described above, the first shielding portion 81 is fixed to the flat portion 13b of the cover main body 13 by welding. In other words, the shielding member 80 is fixed to the cover main body 13 by welding. Therefore, according to the present embodiment, the shielding member 80 can be fixed to the cover main body 13 only by a welding process without requiring a separate member such as a screw to fix the shielding member 80 to the cover main body 13. This makes it possible to prevent an increase in the number of manufacturing steps and manufacturing costs of the rotating electric machine 2 and the pump 1.

[0070] As shown in Figures 2 and 3, the third shielding portion 83 is disposed on the flat portion 13b, radially outward from the box-shaped portion 13c and radially inward from the first flange portion 15a. When viewed in the axial direction, the third shielding portion 83 is substantially trapezoidal. The plate surface of the third shielding portion 83 faces the axial direction. The surface of the third shielding portion 83 facing one axial side contacts a connecting portion 85c of a conductive member 85 (described later). The surface of the third shielding portion 83 facing the other axial side faces the circuit board 70 in the axial direction. A radially inner edge of the third shielding portion 83 is connected to a portion of the end of the side wall portion 82a on the other axial side. The third shielding portion 83 has a protrusion 83a.

[0071] The protrusion 83a is a portion of the third shielding portion 83 that protrudes toward a connecting portion 85c of the conductive member 85, which will be described later. In this embodiment, the protrusion 83a protrudes to one side in the axial direction. When viewed in the axial direction, the protrusion 83a has a substantially circular shape. The protrusion 83a comes into contact with a surface of the connecting portion 85c facing the other side in the axial direction. This electrically connects the shielding member 80 and the conductive member 85.

[0072] As shown in FIG. 1, in this embodiment, the cover member 12 has a first contact member 84. In this embodiment, the first contact member 84 is one of the contact members. That is, the contact member has the first contact member 84. A portion of the first contact member 84 is embedded in the hole portion 15d. This allows the first contact member 84 to be held in the cover main body portion 13. The first contact member 84 is embedded inside the cover main body portion 13 by insert molding using the first contact member 84 and the like as an insert member. The first contact member 84 is conductive. In this embodiment, the first contact member 84 is made of metal.

[0073] As shown in FIGS. 2 and 4, the first contact member 84 has a generally cylindrical shape extending in the axial direction. The first contact member 84 is provided with a through-hole 84d that penetrates in the axial direction. A bolt 93 is passed through the through-hole 84d from one axial side. The bolt 93 is screwed into a threaded hole provided on a surface of the mounting object 5 that faces one axial side. In this way, the rotating electric machine 2 and the pump 1 are fixed to the mounting object 5 via the first contact member 84. The first contact member 84 has a first cylindrical portion 84h, a second cylindrical portion 84i, and a third cylindrical portion 84j. The first cylindrical portion 84h, the second cylindrical portion 84i, and the third cylindrical portion 84j are all part of the same single member.

[0074] The first cylindrical portion 84h has a cylindrical shape extending in the axial direction. The first cylindrical portion 84h is disposed inside the flange portion 15. A plurality of grooves 84k are provided on the outer peripheral surface of the first cylindrical portion 84h. Each of the plurality of grooves 84k extends in the axial direction. The plurality of grooves 84k are provided along the circumferential direction on one axial side and the other axial side of the outer peripheral surface of the first cylindrical portion 84h. A portion of the resin that constitutes the flange portion 15 is filled into the plurality of grooves 84k. This makes it possible to suppress circumferential rotation of the first contact member 84 relative to the flange portion 15.

[0075] The second cylindrical portion 84i has a cylindrical shape and protrudes from the first cylindrical portion 84h to the other axial side. The outer diameter of the second cylindrical portion 84i is smaller than the outer diameter of the first cylindrical portion 84h. The outer peripheral surface of the second cylindrical portion 84i is disposed inside the flange portion 15. In the axial direction, the surface of the second cylindrical portion 84i facing the other axial side is disposed at the same position as the surface of the flange portion 15 facing the other axial side and is exposed to the outside. The surface of the second cylindrical portion 84i facing the other axial side comes into contact with the attachment object 5. In other words, the cover member 12 is held by the cover main body 13, comes into contact with the attachment object 5, and has a first contact member 84 that is conductive.

[0076] The third cylindrical portion 84j is cylindrical and protrudes from the first cylindrical portion 84h to one side in the axial direction. The outer diameter of the third cylindrical portion 84j is smaller than that of the first cylindrical portion 84h. The outer peripheral surface of the third cylindrical portion 84j is disposed inside the flange portion 15. The outer peripheral surface of the third cylindrical portion 84j of the first contact member 84 held by the first flange portion 15a is press-fitted into the fixed portion 85a of the conductive member 85 (described later). The third cylindrical portion 84j of the first contact member 84 held by the second flange portion 15b and the third flange portion 15c is not press-fitted into the fixed portion 85a of the conductive member 85. The surface on one side in the axial direction of the third cylindrical portion 84j is positioned at the same position as the surface on one side in the axial direction of the flange portion 15 and is exposed to the outside. As shown in FIG. 2, the outer diameter of the head 93a of the bolt 93 is smaller than that of the third cylindrical portion 84j. Therefore, the head 93a contacts only the third cylindrical portion 84j, and does not contact the flange portion 15. As a result, the first contact member 84 is fixed to the attachment object 5.

[0077] As shown in FIGS. 2 and 4, the conductive member 85 electrically connects the first contact member 84, the second contact member 92, and the shielding member 80. The conductive member 85 extends radially from the first flange portion 15a toward the inside of the first cylindrical portion 13j. As shown in FIG. 2, a portion of the conductive member 85 is embedded and held inside the cover main body 13. As described above, the conductive member 85 is held in the cover main body 13 by insert molding using the conductive member 85 and the like as an insert member. The conductive member 85 is conductive. In this embodiment, the conductive member 85 is made of metal. The conductive member 85 has a fixing portion 85a, a relay portion 85b, and a connecting portion 85c. The fixing portion 85a, the relay portion 85b, and the connecting portion 85c are all part of the same single member.

[0078] As shown in FIG. 4, the fixing portion 85a has an annular shape. The fixing portion 85a is provided at one end of the conductive member 85. The inner circumferential surface of the fixing portion 85a contacts the outer circumferential surface of the third cylindrical portion 84j of the first contact member 84. The third cylindrical portion 84j is press-fitted into the fixing portion 85a. That is, the conductive member 85 is fixed to the first contact member 84. This electrically connects the conductive member 85 to the first contact member 84. As shown in FIGS. 2 and 3, the fixing portion 85a is embedded and held inside the cover main body 13. That is, the fixing portion 85a and the first contact member 84 are fixed inside the cover main body 13. After being press-fitted and fixed to each other, the conductive member 85 and the first contact member 84 are insert-molded.

[0079] As shown in FIG. 4, the relay portion 85b connects the fixed portion 85a and the connecting portion 85c. As shown in FIGS. 2 and 3, when viewed in the axial direction, the relay portion 85b has a plate shape extending radially from the first flange portion 15a toward the inside of the first cylindrical portion 13j. As shown in FIG. 1, a portion of the relay portion 85b is disposed inside the conductive member holding portion 15g of the cover main body 13. As shown in FIG. 4, one end of the relay portion 85b is connected to the outer peripheral surface of the fixed portion 85a. As shown in FIGS. 2 and 3, the other end of the relay portion 85b protrudes radially inward from the inner peripheral surface of the first cylindrical portion 13j. In the axial direction, the other end of the relay portion 85b is disposed between the surface of the flat portion 13b facing the other axial side and the third shielding portion 83. The other end of the relay portion 85b is connected to the connecting portion 85c. The relay portion 85b includes a first relay portion 85b1, a second relay portion 85b2, a third relay portion 85b3, and a fourth relay portion 85b4. The first relay portion 85b1, the second relay portion 85b2, the third relay portion 85b3, and the fourth relay portion 85b4 are all part of the same single member.

[0080] As shown in Figures 2 and 4, the first relay portion 85b1 has a plate shape extending in the axial direction. The plate surface of the first relay portion 85b1 faces the radial direction. One axial end of the first relay portion 85b1 is connected to the fixed portion 85a. The first relay portion 85b1 is embedded and held inside the cover main body 13.

[0081] The second relay portion 85b2 has a plate shape extending in the radial direction. The plate surface of the second relay portion 85b2 faces the axial direction. The radially outer end of the second relay portion 85b2 is connected to the other axial end of the first relay portion 85b1. The radially inner end of the second relay portion 85b2 is located inside the first cylindrical portion 13j. The second relay portion 85b2 is embedded and held inside the cover main body 13. More specifically, as shown in FIG. 1, the second relay portion 85b2 is embedded and held inside the conductive member holding portion 15g. The second relay portion 85b2 has a through-hole 85d.

[0082] As shown in FIGS. 2 and 4, the through hole 85d is a hole that penetrates the second relay portion 85b2 in the axial direction. The through hole 85d is a circular hole. The second contact member 92 is passed through the through hole 85d. The inner circumferential surface of the through hole 85d contacts the outer circumferential surface of the second contact member 92. That is, the relay portion 85b and the second contact member 92 contact each other inside the cover main body 13. This electrically connects the conductive member 85 and the second contact member 92. As described above, the second contact member 92 is made of a metal that contacts the attachment object 5. Therefore, the conductive member 85 and the attachment object 5 are electrically connected via the second contact member 92.

[0083] The third link portion 85b3 has a plate shape extending in the axial direction. The plate surface of the third link portion 85b3 faces the radial direction. The other axial end of the third link portion 85b3 is connected to the radially inner end of the second link portion 85b2. The third link portion 85b3 is embedded and held inside the first cylindrical portion 13j.

[0084] The fourth relay portion 85b4 has a plate shape extending in the radial direction. The plate surface of the fourth relay portion 85b4 faces the axial direction. A portion of the fourth relay portion 85b4 is embedded and held inside the first cylindrical portion 13j. A radially outer end of the fourth relay portion 85b4 is connected to one axial end of the third relay portion 85b3. As shown in FIG. 5, a radially inner end of the fourth relay portion 85b4 protrudes radially inward beyond the first cylindrical portion 13j and is exposed from the cover main body 13. A radially inner end of the fourth relay portion 85b4 is connected to the connecting portion 85c.

[0085] As shown in FIGS. 4 and 5 , the connection portion 85c has a generally rectangular plate shape extending in the circumferential direction. The plate surface of the connection portion 85c faces the axial direction. The connection portion 85c is provided at the other end of the conductive member 85. In the axial direction, the connection portion 85c is disposed between the flat portion 13b and the third shielding portion 83. That is, the connection portion 85c is exposed to the outside of the cover main body 13. Therefore, as shown in FIG. 5 , by fixing the shielding member 80 to the cover main body 13 from the other axial side, the connection portion 85c and the third shielding portion 83 can be easily brought into contact with each other. As shown in FIGS. 2 and 4 , the surface of the connection portion 85c facing the other axial side is in contact with the protrusion 83a of the third shielding portion 83. That is, the connection portion 85c is in axial contact with the shielding member 80. This electrically connects the conductive member 85 to the shielding member 80. Therefore, the shielding member 80 and the circuit board 70 are electrically connected to the attachment object 5 via the connection terminal 87, the conductive member 85, the first contact member 84, and the second contact member 92. In other words, the shielding member 80 and the circuit board 70 are grounded.

[0086] In this embodiment, the width of the connection portion 85c is greater than the width of the relay portion 85b. In this embodiment, the width of the conductive member 85 refers to the dimension of the conductive member 85 in a direction perpendicular to the direction in which the conductive member 85 extends, as viewed in the axial direction. In this embodiment, the width of the relay portion 85b refers to the dimension of the relay portion 85b in a direction perpendicular to the direction in which the relay portion 85b extends from the first contact member 84 toward the shielding member 80, as viewed in the axial direction. Furthermore, the width of the connection portion 85c refers to the dimension in the circumferential direction. Therefore, even if there is variation in the circumferential position of the conductive member 85 relative to the cover main body 13, stable contact between the connection portion 85c and the protrusion 83a of the shielding member 80 can be achieved. Therefore, as shown in FIG. 5 , a process of attaching the shielding member 80 from the other axial side to the cover main body 13, which holds the conductive member 85 in advance, can ensure stable electrical connection between the conductive member 85 and the shielding member 80. This improves the ease of assembly of the rotating electric machine 2 and the pump 1.

[0087] According to this embodiment, the cover member 12 includes a resin cover body 13, a metal shielding member 80 fixed to a surface of the cover body 13 facing the other axial direction and disposed on one axial side of the circuit board 70, a conductive member 85 held by the cover body 13 and having electrical conductivity, and conductive contact members 84, 92 held by the cover body 13 and in contact with the attachment target 5. The conductive member 85 is electrically connected to the shielding member 80 and the contact members 84, 92. The circuit board 70 is electrically connected to the shielding member 80. In other words, because the cover body 13 is made of resin, the weight of the cover member 12 can be reduced. Furthermore, the circuit board 70 and the shielding member 80 can be grounded via the contact members 84, 92 and the conductive member 85. Therefore, the shielding member 80 can shield at least a portion of the electromagnetic noise radiated from the control device 7 to one axial side. As a result, even if the cover main body 13 is made of resin, the shielding member 80 can reduce electromagnetic noise radiated from the rotating electrical machine 2 and the pump 1 to the outside.

[0088] In this embodiment, the shielding member 80 is fixed to the cover main body 13, and by assembling the cover member 12 to the main body 11, the shielding member 80 can be easily positioned in a suitable position relative to the circuit board 70. This makes it easy to suitably position the shielding member 80 in a location necessary for suitable shielding of electromagnetic noise, and makes it easy to shape the shielding member 80 to the minimum necessary shape for suppressing electromagnetic noise. This prevents the shielding member 80 from becoming too large, and further reduces the weight of the cover member 12. Therefore, according to this embodiment, the electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1 can be reduced while reducing the weight of the rotating electric machine 2 and the pump 1.

[0089] In this embodiment, the main body 11 of the housing 10, which is disposed on the other axial side of the circuit board 70, is made of metal. Therefore, at least a portion of the electromagnetic noise radiated from the control device 7 to the other axial side is blocked by the main body 11, thereby reducing the electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0090] Furthermore, in this embodiment, the shielding member 80 is fixed to the surface of the cover body 13 facing the other axial side. Therefore, compared to a configuration in which the shielding member 80 is held to the cover body 13 by insert molding, the shielding member 80 can be formed into a complex shape. For example, a box-shaped second shielding portion 82 that protrudes in the axial direction can be easily provided. A third shielding portion that connects to the second shielding portion 82 can be easily provided. In other words, in this embodiment, the shielding member 80 having a complex shape can be formed from a single member. This prevents an increase in the number of parts required for the shielding member 80. Furthermore, if a shielding member having the same shape as the shielding member 80 of this embodiment were to be held to the cover body 13 by insert molding, the shielding member would need to be divided into two or more parts. In this case, additional members would be required to electrically connect the respective parts of the shielding member, resulting in an increase in the number of parts. Therefore, in this embodiment, the number of parts required for the rotating electric machine 2 and the pump and an increase in manufacturing costs can be prevented.

[0091] Furthermore, according to this embodiment, the shielding member 80 is fixed to the surface of the cover main body 13 facing the other axial side, and therefore the shielding member 80 can be disposed on one axial side of the control device 7 by the process of attaching the cover member 12 to the main body 11. This improves the ease of assembly of the rotating electric machine 2 and the pump 1. Furthermore, this reduces the likelihood of forgetting to attach the shielding member 80 during the manufacturing process of the rotating electric machine 2 and the pump 1. This further improves the ease of assembly of the rotating electric machine 2 and the pump 1.

[0092] According to this embodiment, the shielding member 80 is plate-shaped. Therefore, the weight of the shielding member 80 can be reduced. Therefore, the weight of the rotating electric machine 2 and the pump 1 can be reduced. Furthermore, because the shielding member 80 can be formed by press working, an increase in the manufacturing cost of the shielding member 80 can be suppressed. Therefore, an increase in the manufacturing cost of the rotating electric machine 2 and the pump 1 can be suppressed.

[0093] According to this embodiment, the contact member has a first contact member 84 made of metal that is fixed to the attachment object 5. The conductive member 85 has a fixing portion 85a that is fixed to the first contact member 84. The fixing portion 85a is annular, and the first contact member 84 is cylindrical and press-fitted into the fixing portion 85a. This allows the conductive member 85 and the first contact member 84 to be firmly fixed together. This allows the circuit board 70 and the shielding member 80 to be stably grounded. This allows for an effective reduction in electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0094] Furthermore, in this embodiment, the shielding member 80 and the circuit board 70 can be grounded by utilizing the first contact member 84 that fixes the rotating electric machine 2 and the pump 1 to the mounting object 5. Therefore, there is no need to provide a separate member or the like for grounding the shielding member 80 and the circuit board 70. This makes it possible to prevent an increase in the number of parts and manufacturing costs of the rotating electric machine 2 and the pump 1.

[0095] According to this embodiment, the fixing portion 85a and a portion of the first contact member 84 are embedded inside the cover body 13, and the fixing portion 85a and the first contact member 84 are fixed inside the cover body 13. In other words, the area where the fixing portion 85a and the first contact member 84 are fixed is covered with the resin that constitutes the cover body 13. This makes it difficult for the fixing portion 85a and the first contact member 84 to come off each other, and the conductive member 85 and the first contact member 84 can be more firmly fixed. This allows the circuit board 70 and the shielding member 80 to be more stably grounded. This makes it possible to more effectively reduce electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0096] According to this embodiment, the mounting target 5 includes a positioning pin 92 that fits into a hole 5b of the mounting target 5, the relay portion 85b has a through hole 85d that passes through the relay portion 85b in the axial direction, and the positioning pin 92 passes through the through hole 85c. As described above, the first contact member 84 that is fixed to the mounting target 5 is fixed to the conductive member 85. Therefore, the relative positions of the first contact member 84 and the positioning pin 92 in the circumferential and radial directions can be determined with high accuracy by the conductive member 85. In other words, variation in the position of the positioning pin 92 with respect to the first contact member 84 in the circumferential and radial directions can be suppressed. Therefore, variation in the mounting positions of the rotating electric machine 2 and the pump 1 with respect to the mounting target 5 can be suitably suppressed.

[0097] According to this embodiment, the contact member has a metal second contact member 92 that comes into contact with the attachment object 5. The second contact member 92 is a positioning pin 92 that comes into contact with the relay portion 85b. Therefore, the second contact member 92 can electrically connect the attachment object 5 and the conductive member 85. The second contact member 92 can be used to ground the shielding member 80 and the circuit board 70. Therefore, there is no need to provide a separate member for grounding the shielding member 80 and the circuit board 70. This can prevent an increase in the number of parts and manufacturing costs of the rotating electric machine 2 and the pump 1.

[0098] According to this embodiment, a portion of the relay portion 85b and a portion of the second contact member 92 are embedded and held within the cover body 13, and the relay portion 85b and the second contact member 92 contact each other within the cover body 13. In other words, the area where the relay portion 85b and the second contact member 92 contact each other is covered with the resin that constitutes the cover body 13. This makes it difficult for the relay portion 85b and the second contact member 92 to move relative to each other, allowing for more stable contact between the conductive member 85 and the second contact member 92. This allows for more stable grounding of the circuit board 70 and the shielding member 80. This allows for more effective reduction of electromagnetic noise radiated from the rotating electric machine 2 and the pump 1 to the outside.

[0099] Furthermore, according to this embodiment, the circuit board 70 and the shielding member 80 can be grounded via the second contact member 92 in addition to the first contact member 84. This allows the circuit board 70 and the shielding member 80 to be grounded more stably. This makes it possible to more effectively reduce electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0100] According to this embodiment, the shielding member 80 has a protrusion 83a that protrudes toward the connecting portion 85c, and the protrusion 83a contacts the connecting portion 85c. Therefore, even if there is axial variation in the positions of the shielding member 80 and the connecting portion 85c relative to the cover body 13, the shielding member 80 can be stably contacted with the connecting portion 85c. This allows the circuit board 70 and the shielding member 80 to be more stably grounded. This allows for more effective reduction of electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0101] According to this embodiment, the connecting portion 85c is disposed so as to be exposed to the outside of the cover main body 13, and is in axial contact with the shielding member 80. Therefore, as described above, the conductive member 85 and the shielding member 80 can be easily brought into contact with each other by the step of attaching the shielding member 80 from the other axial side to the cover main body 13, which previously holds the conductive member 85. This further improves the ease of assembly of the rotating electric machine 2 and the pump 1.

[0102] According to this embodiment, the circuit board 70 is provided with a plurality of electronic components 71 attached thereto, and the shielding member 80 is disposed on one axial side of the plurality of electronic components 71, so that the plurality of electronic components 71 and the shielding member 80 overlap when viewed in the axial direction. Therefore, the shielding member 80 can block electromagnetic noise radiated from the plurality of electronic components 71 to one axial side. This can reduce electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0103] Furthermore, according to this embodiment, the shielding member 80 is disposed on one axial side of the electronic components 71 and relatively close to the electronic components 71. More specifically, the first shielding portion 81 is disposed on one axial side of the second electronic component 71b and relatively close to the second electronic component 71b. The top wall portion 82b is disposed on one axial side of the first electronic component 71a and relatively close to the first electronic component 71a. Electromagnetic noise is radiated radially from the electronic components. Therefore, the greater the distance between the shielding member 80 and the electronic components 71, the larger the area of ​​the shielding member 80 needs to be to reduce electromagnetic noise radiated from the rotating electric machine 2 to the outside. However, in this embodiment, the shielding member 80 is disposed relatively close to the electronic components 71. Therefore, by disposing the shielding member 80 only on one axial side of the electronic components 71, electromagnetic noise radiated from the rotating electric machine 2 to the outside can be reduced. This allows the shielding member 80 to be made smaller and lighter. Therefore, the weight of the rotary electric machine 2 and the pump 1 can be reduced.

[0104] According to this embodiment, the multiple electronic components 71 include a first electronic component 71a and a second electronic component 71b. The first electronic component 71a has a larger axial dimension than the second electronic component 71b. The shielding member 80 has a sidewall 82a that surrounds the first electronic component 71a. Therefore, the sidewall 82a can block electromagnetic noise radiated radially outward from the first electronic component 71a, which has a larger axial dimension. This can more effectively reduce electromagnetic noise radiated to the outside from the rotating electric machine 2 and the pump 1.

[0105] According to this embodiment, the heat transfer member 90 is attached to a surface of the circuit board 70 facing one axial direction, and the heat transfer member 90 is in contact with the shielding member 80. Therefore, as described above, heat generated in the second electronic component 71b, such as a transistor, can be more efficiently transferred to the shielding member 80. Also, as described above, in this embodiment, the metal shielding member 80 is connected to the metal mounting target 5 via the metal conductive member 85, the metal first contact member 84, and the metal second contact member 92. Therefore, the heat transferred to the shielding member 80 is efficiently transferred to the mounting target 5. In other words, the heat generated in the control device 7 is efficiently transferred to the mounting target 5 and dissipated to the outside of the rotating electric machine 2 and the pump 1. Therefore, the heat dissipation performance of the control device 7 can be efficiently improved.

[0106] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. For example, the shielding member may be fixed to the cover main body by a method other than welding. For example, the shielding member may be bonded with an adhesive such as an epoxy resin adhesive, or may be fixed with a separate member such as a screw. Furthermore, the shape of the shielding member is not limited to that of the present embodiment, as long as it can reduce the electromagnetic noise emitted from the control device. For example, the shielding member may be cylindrical and house the control device.

[0107] The conductive member is not limited to the shape of this embodiment as long as it can electrically connect the contact member and the shielding member. The conductive member does not have to be a single member and may be composed of two or more members. Furthermore, the conductive member does not have to be embedded in the cover main body.

[0108] The shielding member does not have to be directly connected to the conductive member as long as it is stably grounded. For example, it may be grounded via a separate member that is electrically connected to the conductive member and the shielding member, or it may be electrically connected to a grounded circuit board. Furthermore, the shielding member does not have to have a protrusion; for example, the connection portion of the conductive member may have a protrusion that protrudes toward the shielding member.

[0109] The application of the rotating electric machine to which the present invention is applied is not particularly limited. The rotating electric machine may be mounted on equipment other than a pump. The rotating electric machine is not limited to a motor and may be a generator. The application of a pump including a rotating electric machine to which the present invention is applied is not particularly limited. The type of fluid pumped by the pump is not particularly limited and may be water, for example. The rotating electric machine and the pump may be mounted on equipment other than a vehicle. Note that the configurations and methods described in this specification can be combined as appropriate within a range that does not contradict each other. [Explanation of symbols]

[0110] 1...pump, 2...rotating electric machine, 5...mounting object, 5b...hole portion, 10...housing, 11...main body portion, 11b...opening portion, 12...cover member, 13...cover main body portion, 20...rotor, 30...stator, 40...pump mechanism, 70...circuit board, 71...electronic component, 71a...first electronic component, 71b...second electronic component, 80...shielding member, 82a...side wall portion, 83a...protrusion portion, 84...first contact member, 85...conductive member, 85a...fixing portion, 85b...relay portion, 85c...connection portion, 85d...through hole, 87...connection terminal, 90...heat transfer member, 92...second contact member (positioning pin), J...central axis

Claims

1. A rotating electric machine to be attached to an attachment object, a rotor rotatable about a central axis; a stator facing the rotor with a gap in the radial direction; a circuit board disposed on one axial side of the stator; a housing that accommodates the rotor, the stator, and the circuit board; Equipped with The housing includes: a main body portion having an opening on one axial side; a cover member that closes the opening; and The cover member is a resin cover body; a metallic shielding member fixed to a surface of the cover body facing the other axial side and disposed on one axial side of the circuit board; a conductive member that is held by the cover body and has conductivity; a contact member that is held by the cover body and that comes into contact with the attachment object and has conductivity; and the conductive member is electrically connected to the shielding member and the contact member; the circuit board is electrically connected to the shielding member, the conductive member has a fixing portion that is fixed to the contact member, The fixed portion is fixed to a surface of the contact member.

2. A rotating electric motor as described in Claim 1, wherein the fixed portion and a portion of the contact member are each embedded and held inside the cover main body portion.

3. The rotating electric machine according to claim 1 or 2, wherein the shielding member is fixed to the cover body by welding.

4. the conductive member has a connection portion that contacts the shielding member and a relay portion that connects the fixed portion and the connection portion, The rotating electric machine according to claim 1 , wherein a width of the connection portion is larger than a width of the relay portion.

5. the contact member has a first contact member made of metal that is fixed to the attachment object, the conductive member has a fixing portion fixed to the first contact member, the fixing portion is annular, The rotating electric machine according to claim 4 , wherein the first contact member is cylindrical and press-fitted into the fixed portion.

6. the fixing portion and a portion of the first contact member are embedded and held inside the cover main body portion, The rotating electric machine according to claim 5 , wherein the fixing portion and the first contact member are fixed inside the cover body portion.

7. a positioning pin that is fitted into a hole in the attachment target, The relay portion has a through hole that passes through the relay portion in the axial direction, The rotating electric machine according to claim 4 , wherein the positioning pin is inserted into the through hole.

8. the contact member has a second contact member made of metal that comes into contact with the attachment object, The rotating electric machine according to claim 7 , wherein the second contact member is the positioning pin and contacts the relay portion.

9. the relay portion and a portion of the second contact member are embedded and held inside the cover main body portion, The rotating electric machine according to claim 8 , wherein the relay portion and the second contact member are in contact with each other inside the cover body portion.

10. one of the shielding member and the connecting portion has a protrusion that protrudes toward the other of the shielding member and the connecting portion, The rotating electric machine according to claim 4 , wherein the protrusion contacts the other of the shielding member and the connecting portion.

11. The rotating electric machine according to claim 4 , wherein the connection portion is disposed so as to be exposed to the outside of the cover body portion and is in contact with the shielding member in the axial direction.

12. a connection terminal attached to the circuit board; The connection terminal is in the form of an elastic leaf spring, The rotating electric machine according to claim 1 , wherein the shielding member is electrically connected to the circuit board via the connection terminal.

13. a plurality of electronic components mounted on the circuit board; the shielding member is disposed on one axial side of the plurality of electronic components, The rotating electric machine according to claim 1 , wherein a plurality of the electronic components and the shielding member overlap each other when viewed in the axial direction.

14. the plurality of electronic components include a first electronic component and a second electronic component; the first electronic component has an axial dimension larger than that of the second electronic component; The rotating electric machine according to claim 13 , wherein the shielding member has a sidewall portion that surrounds the radially outer side of the first electronic component.

15. a heat transfer member attached to a surface of the circuit board facing one axial direction; The rotating electric machine according to claim 1 , wherein the heat transfer member is in contact with the shielding member.

16. A rotating electric machine according to any one of claims 1 to 15; a pump mechanism connected to the rotor; A pump comprising:

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