Electric pump

Abstract

To provide an electric pump with a simple structure that can ground a substrate.SOLUTION: An electric pump according to an embodiment of the present invention is accommodated in a mounting recess of an object, and includes a motor unit having a rotor with a shaft rotatable about a central axis and a stator facing the rotor across a gap, a circuit board electrically connected to the stator, a pump mechanism connected to one axial side of the shaft, a housing that accommodates the motor unit, the circuit board, and the pump mechanism, a first conductive member, and a second conductive member. The housing has a metal housing main body that accommodates the stator, and a pump cover connected to one axial end of the housing main body and covering the pump mechanism from one axial side. The first conductive member 85 electrically connects the circuit board 7 to the housing main body 80. The second conductive member 86 contacts the housing main body and the inner surface of the mounting recess 9a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] There is known an electric pump having a circuit board, a rotating electric machine, a pump mechanism, and a housing that accommodates these components. In such an electric pump, the circuit board may be connected to a metal case in order to ground the circuit board. One known method for connecting the circuit board to the case is to electrically connect the ground pattern of the circuit board to the case with screws (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-80471 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric pump described above, the portion of the housing that houses the circuit board may be made of a resin material in order to reduce manufacturing costs, etc. In this case, there is a problem that the structure becomes complicated when attempting to ground the circuit board to an external component via the housing.

[0005] In view of the above circumstances, one object of the present invention is to provide an electric pump that has a simple structure and can ground a substrate. [Means for solving the problem]

[0006] One embodiment of the electric pump of the present invention is an electric pump accommodated in an accommodating recess of an attachment target, and includes a motor unit having a rotor with a shaft rotatable about a central axis and a stator facing the rotor across a gap, a circuit board electrically connected to the stator, a pump mechanism connected to one axial side of the shaft, a housing accommodating the motor unit, the circuit board, and the pump mechanism, a first conductive member, and a second conductive member. The housing includes a metal housing main body that accommodates the stator, and a pump cover connected to one axial end of the housing main body and covering the pump mechanism from one axial side. The first conductive member electrically connects the circuit board to the housing main body. The second conductive member contacts the housing main body and the inner surface of the accommodating recess. [Effects of the Invention]

[0007] According to one aspect of the present invention, in an electric pump, the substrate can be grounded with a simple structure. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing an electric pump according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing a part of the electric pump in the first embodiment. [Figure 3] FIG. 3 is an exploded perspective view showing a part of the electric pump in the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the electric pump in the first embodiment, illustrating a part of the second conductive member. [Figure 5] FIG. 5 is a cross-sectional view showing a part of the electric pump in the first embodiment, showing another part of the second conductive member. [Figure 6] FIG. 6 is a cross-sectional view showing a part of the electric pump in the first embodiment, illustrating the first conductive member. [Figure 7]FIG. 7 is a cross-sectional view showing a part of the electric pump according to the second embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a part of the electric pump according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In each drawing, a central axis J of the electric pump in each of the following embodiments is shown as appropriate. The central axis J is a virtual axis. In the following description, the direction in which the central axis J extends, i.e., the axial direction of the central axis J, will be simply referred to as the "axial direction," the radial direction about the central axis J will be simply referred to as the "radial direction," and the circumferential direction about the central axis J will be simply referred to as the "circumferential direction." In each drawing, a Z axis parallel to the axial direction is shown. In the following description, the side in the axial direction toward which the arrow of the Z axis points (+Z side) will be referred to as the "upper side," and the side opposite to the side toward which the arrow of the Z axis points (-Z side) will be referred to as the "lower side." In each of the following embodiments, the lower side corresponds to "one axial side," and the upper side corresponds to "the other axial side." Note that the terms "upper side" and "lower side" are merely names used to describe the relative positions of the components, and the actual relative positions may be other than those indicated by these names.

[0010] First Embodiment As shown in FIG. 1, the electric pump 100 of this embodiment is attached to an attachment object 9. The attachment object 9 is made of metal. The attachment object 9 is, for example, a housing of a drive unit that is connected to an axle and rotates the axle to move the vehicle. The attachment object 9 has an accommodating recess 9a and an attachment surface 9f. The accommodating recess 9a is recessed downward from the attachment surface 9f. The accommodating recess 9a opens upward. The electric pump 100 is accommodated in the accommodating recess 9a. Note that "the electric pump 100 is accommodated in the accommodating recess 9a" means that at least a portion of the electric pump 100 is located inside the accommodating recess 9a.

[0011] The accommodating recess 9a has an inner surface 9b. The inner surface 9b has a peripheral wall surface 9d facing radially inward and a bottom wall surface 9e facing upward. The peripheral wall surface 9d is a substantially cylindrical surface centered on the central axis J. The bottom wall surface 9e is a substantially circular flat surface when viewed in the axial direction. The bottom wall surface 9e is provided with an inlet opening 9g, an outlet opening 9h, and a cylindrical portion 9i surrounding the inlet opening 9g. The inlet opening 9g is a circular opening when viewed in the axial direction. As the electric pump 100 is driven, the fluid flows into the accommodating recess 9a from the inlet opening 9g. The outlet opening 9h is an opening that extends in an arc shape centered on the central axis J when viewed in the axial direction. As the electric pump 100 is driven, the fluid flows out of the accommodating recess 9a from the outlet opening 9h. The shape of the outlet opening 9h is not limited. The cylindrical portion 9i has a cylindrical shape that surrounds the inlet opening 9g and protrudes upward along the inner edge of the inlet opening 9g.

[0012] The mounting surface 9f is provided around the upper opening of the accommodating recess 9a. The electric pump 100 is fixed to the mounting surface 9f. The electric pump 100 is inserted into the accommodating recess 9a from the upper opening thereof, and then a support member 70 (described later) is fixed to the mounting surface 9f, thereby fixing the electric pump 100 to the mounting object 9.

[0013] The electric pump 100 of this embodiment is, for example, an electric pump mounted on a vehicle. The fluid pumped by the electric pump 100 is, for example, oil. The fluid pumped by the electric pump 100 is not particularly limited, and may be a fluid other than oil, such as water. The electric pump 100 includes a motor unit 10 and a pump mechanism 20 connected to the motor unit 10.

[0014] The pump mechanism 20 is driven by the motor unit 10 to pump fluid. The pump mechanism 20 is housed in a pump chamber R provided in the housing main body 80, which will be described later. In this embodiment, the pump mechanism 20 is a trochoid pump mechanism. The pump mechanism 20 has an inner rotor 21 that is rotated about a central axis J by the motor unit 10, and an outer rotor 22 that surrounds and meshes with the inner rotor 21. The pump mechanism 20 may have any structure as long as it can pump fluid.

[0015] The motor section 10 comprises a rotor 30 rotatable around a central axis J, a stator 40 facing the rotor 30 across a gap, a substrate 7 located above the stator 40, a housing 6, a first conductive member 85, and a second conductive member 86.

[0016] The rotor 30 has a shaft 31 extending in the axial direction, a rotor core 32 fixed to the outer peripheral surface of the shaft 31, and a plurality of magnets 33 fixed to the rotor core 32. That is, the rotor 30 is provided with the shaft 31. In this embodiment, the shaft 31 is a cylindrical hollow shaft that extends about a central axis J and is open on both sides in the axial direction. The shaft 31 is rotatable about the central axis J. The inner rotor 21 of the pump mechanism 20 is connected to the lower end of the shaft 31. That is, the pump mechanism 20 is connected to the lower side of the shaft 31.

[0017] The stator 40 is located radially outside the rotor 30. The stator 40 is annular and surrounds the rotor 30. The stator 40 has a stator core 41, an insulating insulator 42 attached to the stator core 41, and a plurality of coils 43 attached to the stator core 41 via the insulator 42.

[0018] The stator core 41 is disposed radially outwardly of the rotor core 32, facing the rotor core 32 with a gap therebetween. The stator core 41 has an annular core back 41a surrounding the central axis J and a plurality of teeth 41b extending radially inward from the core back 41a. The plurality of teeth 41b are disposed at equal intervals around the circumference. A plurality of coils 43 are attached to the plurality of teeth 41b via insulators 42. That is, the coils 43 are attached to the stator core 41.

[0019] The coil 43 is formed by winding a coil wire around the teeth 41b. A lead wire 43a is drawn out from the coil 43. The lead wire 43a is an end of the coil wire. The lead wire 43a extends upward from the stator core 41. A terminal member 5 is connected to the tip of the lead wire 43a. The terminal member 5 is connected to the substrate 7. As a result, the substrate 7 is electrically connected to the stator 40 via the terminal member 5.

[0020] The housing 6 accommodates the motor unit 10, the circuit board 7, the pump mechanism 20, and the first conductive member 85. The housing 6 has a housing main body 80, a pump cover 90 located below the housing main body 80, a support member 70 located above the housing main body 80, a lid 60 located above the support member 70, and a shielding plate 50 located above the lid 60. The housing main body 80, the pump cover 90, and the shielding plate 50 are made of metal. The support member 70 and the lid 60 are made of resin.

[0021] The housing main body 80 accommodates the pump mechanism 20, the rotor 30, and the stator 40 therein. The housing main body 80 is made of metal. The housing main body 80 is tubular and open at the top. The housing main body 80 is substantially cylindrical and centered on the central axis J. The housing main body 80 has a stator accommodating portion 81, a pump mechanism accommodating portion 82, and a pump cover fitting portion 83. The stator accommodating portion 81 is substantially cylindrical and centered on the central axis J and open at the top. The stator accommodating portion 81 accommodates the stator 40 therein. The outer peripheral surface of the stator core 41 is fixed to the inner peripheral surface 80f of the stator accommodating portion 81. That is, the inner peripheral surface 80f of the housing main body 80 contacts the outer peripheral surface of the stator core 41. The stator accommodating portion 81 has a bottom wall portion 81a located below the stator 40. The bottom wall portion 81a is provided with a through-hole 81b that passes through the bottom wall portion 81a in the axial direction. The shaft 31 is passed through the through-hole 81b in the axial direction.

[0022] The pump mechanism accommodating portion 82 is connected to the underside of the stator accommodating portion 81. The outer diameter of the pump mechanism accommodating portion 82 is smaller than the outer diameter of the stator accommodating portion 81. The pump mechanism accommodating portion 82 has a mechanism accommodating portion 82a that is recessed upward from the lower surface of the pump mechanism accommodating portion 82. At least a portion of the lower opening of the mechanism accommodating portion 82a is covered by the pump cover 90, thereby forming a pump chamber R that accommodates the pump mechanism 20 therein. The lower end of the shaft 31 that is passed through the through hole 81b is disposed inside the pump chamber R. The lower end of the shaft 31 is connected to the inner rotor 21 inside the pump chamber R.

[0023] The pump cover fitting portion 83 is located below the pump mechanism accommodating portion 82. The pump cover fitting portion 83 is cylindrical and centered on the central axis J. The inner diameter of the pump cover fitting portion 83 is larger than the inner diameter of the pump mechanism accommodating portion 82. The internal space of the pump cover fitting portion 83 is connected to the mechanism accommodating portion 82a of the pump mechanism accommodating portion 82.

[0024] The pump cover 90 is press-fitted onto the inner circumferential surface of the pump cover fitting portion 83. This connects the pump cover 90 to the lower end of the housing main body 80. The pump cover 90 covers the pump mechanism 20 from below. The method of fixing the pump cover 90 to the housing main body 80 is not particularly limited. The pump cover 90 has a disk portion 91 that is disk-shaped and centered on the central axis J, and a port portion 92 that protrudes downward from a lower surface 91a of the disk portion 91. The pump cover 90 is provided with an inlet hole 93 and an outlet hole 94. The inlet hole 93 and the outlet hole 94 penetrate the pump cover 90 in the axial direction. The inlet hole 93 and the outlet hole 94 are each connected to the pump chamber R. The inlet hole 93 opens into the lower end surface of the port portion 92. The outlet hole 94 opens into the lower surface 91a of the disk portion 91. The electric pump 100 draws fluid into the pump chamber R through the inlet hole 93. The electric pump 100 also discharges the fluid to the outside of the pump chamber R through the discharge hole 94.

[0025] The port portion 92 has a cylindrical shape extending in the axial direction. The inner circumferential surface of the port portion 92 forms the inner circumferential surface of the suction hole 93. The outer circumferential surface of the port portion 92 is provided with a groove into which an O-ring 92g is fitted. The port portion 92 is inserted into the inlet opening 9g of the attachment object 9. The O-ring 92g seals the gap between the outer circumferential surface of the port portion 92 and the inner circumferential surface of the inlet opening 9g.

[0026] As shown in FIG. 2, a second conductive member 86 is attached to the radially outer surface of the housing main body 80. In this embodiment, the second conductive member 86 is attached to the radially outer surface of the lower portion of the stator accommodating portion 81. As shown in FIG. 3, a recess 87 recessed radially inward is provided on the radially outer surface of the housing main body 80. The recess 87 is provided on the radially outer surface of the lower portion of the stator accommodating portion 81. In this embodiment, the recess 87 is an annular groove surrounding the central axis J. As shown in FIGS. 4 and 5, in a cross section perpendicular to the circumferential direction, the interior of the recess 87 has a substantially triangular shape that protrudes radially inward. The inner surface of the recess 87 has a first hook portion 87a and a second hook portion 87b. In other words, the housing main body 80 has the first hook portion 87a and the second hook portion 87b.

[0027] The first hook portion 87a is a surface located on the upper side of the inner surface of the recessed portion 87. In this embodiment, the first hook portion 87a is located increasingly upward as it extends radially outward. The first hook portion 87a faces downward and radially outward. The second hook portion 87b is a surface located on the lower side of the inner surface of the recessed portion 87. In this embodiment, the second hook portion 87b is located increasingly downward as it extends radially outward. The second hook portion 87b faces upward and radially outward. A radially inner end of the first hook portion 87a and a radially inner end of the second hook portion 87b are connected to each other. As shown in FIG. 4, the angle α formed between the first hook portion 87a and the second hook portion 87b in a cross section perpendicular to the circumferential direction is an obtuse angle. The angle α may be 90° or an acute angle.

[0028] 1, the support member 70 is located between the substrate 7 and the stator 40 in the axial direction. The support member 70 supports the substrate 7, the terminal members 5, the first conductive member 85, and the cover 60. The support member 70 has a first cylindrical portion 71, a second cylindrical portion 72, an annular portion 73, and fixing claw portions 74.

[0029] The first cylindrical portion 71 has a substantially cylindrical shape centered on the central axis J. A protruding wall portion 71a that protrudes radially inward is provided on the inner peripheral surface of the first cylindrical portion 71. A boss portion 71b that protrudes upward and supports the substrate 7 is provided on the upper surface of the protruding wall portion 71a. A terminal member support portion 71c that supports the terminal member 5 is provided on the surface of the protruding wall portion 71a facing radially inward. As shown in FIG. 6 , a groove portion 71h that extends circumferentially and accommodates an O-ring 79 is provided on the outer peripheral surface of the first cylindrical portion 71. The O-ring 79 provides a seal between the outer peripheral surface of the electric pump 100 and the peripheral wall surface 9d of the installation recess 9a of the attachment target 9.

[0030] The second cylindrical portion 72 has a substantially cylindrical shape centered on the central axis J. The second cylindrical portion 72 is located above the first cylindrical portion 71. The outer diameter of the second cylindrical portion 72 is larger than the outer diameter of the first cylindrical portion 71. The second cylindrical portion 72 opens upward. The upper opening of the second cylindrical portion 72 is covered by the lid 60. The lid 60 is fixed to the upper end of the second cylindrical portion 72.

[0031] The annular portion 73 has an annular plate shape centered on the central axis J. The annular portion 73 connects the upper end of the first cylindrical portion 71 and the lower end of the second cylindrical portion 72. A lower surface 73f of the annular portion 73 faces a mounting surface 9f of the mounting object 9 in the axial direction. The lower surface 73f contacts the mounting surface 9f. Although not shown, the support member 70 has a fixing portion that protrudes radially outward from the annular portion 73. The fixing portion is screwed to the mounting surface 9f. This fixes the support member 70 to the mounting object 9.

[0032] The fixing claws 74 protrude downward from the lower end of the first cylindrical portion 71. The fixing claws 74 are located radially outward from the upper end of the housing main body 80. A hook 74a protruding radially inward is provided at the lower end of the fixing claws 74. The hook 74a is hooked into a fixing groove 80g provided on the outer peripheral surface of the housing main body 80. This fixes the fixing claws 74 to the housing main body 80. A plurality of fixing claws 74 are provided at intervals in the circumferential direction. The support member 70 is fixed to the housing main body 80 by the plurality of fixing claws 74.

[0033] 1, the lid 60 covers the substrate 7 from above. The lid 60 protects the substrate 7. The lid 60 also supports a plurality of connector terminals 8. The lid 60 has a top wall portion 61, a peripheral wall portion 62, a flange portion 63, and a connector portion 64.

[0034] The top wall portion 61 has a generally circular plate shape that extends radially. The top wall portion 61 covers the substrate 7 from above. The peripheral wall portion 62 protrudes downward from the radial outer edge of the top wall portion 61. The peripheral wall portion 62 is generally cylindrical and centered on the central axis J. The flange portion 63 protrudes radially outward from the lower end of the peripheral wall portion 62. The flange portion 63 is generally annular and surrounds the central axis J. The outer edge of the flange portion 63 protrudes downward and fits into the inner circumferential surface of the second cylindrical portion 72 of the support member 70. The lid body 60 is fixed to the support member 70 at the flange portion 63. The lid body 60 and the second cylindrical portion 72 are joined without any gaps by means such as welding.

[0035] The connector portion 64 has a cylindrical protective tube portion 64a that protrudes upward from the top wall portion 61, and a terminal support portion 64b that supports the connector terminals 8. The connector portion 64 surrounds and protects the connector terminals 8. The terminal support portion 64b is disposed inside the protective tube portion 64a when viewed in the axial direction.

[0036] A potting reservoir 64c is provided on the downward-facing surface of the terminal support portion 64b. The potting reservoir 64c is concave and opens downward. The connector terminals 8 extend from the bottom of the potting reservoir 64c into the interior space of the housing 6. A potting material P is stored in the potting reservoir 64c. The potting material P is made of an adhesive resin material. The potting material P is stored in the potting reservoir 64c in an uncured state and is cured through a curing process such as ultraviolet irradiation. The potting material P seals any minute gaps between the connector terminals 8 and the terminal support portion 64b. This ensures that the interior of the housing 6 is waterproof.

[0037] According to this embodiment, by making the lid body 60 from a resin material, the connector terminals 8 can be directly supported on the lid body 60. In contrast, if the lid body is made of metal, a support portion for the connector terminals 8 must be provided separately on the lid body. In this case, there is a problem that the structure of the lid body becomes complicated in order to waterproof the gap between the lid body and the support portion. According to this embodiment, by making the lid body 60 from a resin material, the structure of the lid body 60 can be simplified, and the electric pump 100 can be manufactured inexpensively. Furthermore, according to this embodiment, by making the lid body 60 from a resin material, which is an insulating material, the lid body 60 can be disposed close to the substrate 7. This allows the electric pump 100 to be made smaller in the axial direction.

[0038] The shielding plate 50 is disposed above the lid body 60. The shielding plate 50 covers at least a portion of the lid body 60 from above. The shielding plate 50 has a plate body 51, a peripheral plate portion 52, and a flange plate portion 53.

[0039] The plate body 51 extends along a plane perpendicular to the central axis J. When viewed in the axial direction, the plate body 51 has a substantially circular shape centered on the central axis J. The plate body 51 covers the top wall portion 61 of the lid body 60 from above. The plate body 51 is provided with an opening 51h that passes through the plate body 51 in the axial direction. The connector portion 64 passes through the opening 51h.

[0040] The peripheral plate portion 52 protrudes downward from the radial outer edge of the plate body 51. The peripheral plate portion 52 is substantially cylindrical and has a center on the central axis J. A peripheral wall portion 62 of the lid body 60 is disposed radially inside the peripheral plate portion 52. The peripheral plate portion 52 surrounds the lid body 60 from the radial outside.

[0041] The flange plate portion 53 protrudes radially outward from the lower end of the peripheral plate portion 52. The flange plate portion 53 has a generally annular shape surrounding the central axis J. Although not shown, the shielding plate 50 is fixed to at least a part of the support member 70 or the lid body 60 at the flange plate portion 53. The shielding plate 50 is electrically connected to the attachment object 9.

[0042] The shielding plate 50 of this embodiment is made of metal and covers at least a portion of the cover 60 from above. In the electric pump 100 of this embodiment, the cover 60 is made of a resin material, making it difficult to expect the cover 60 to have the effect of shielding electromagnetic noise. The shielding plate 50 of this embodiment can cover the substrate 7 via the cover 60. This allows the shielding plate 50 to shield electromagnetic noise from the substrate 7, reducing electromagnetic noise radiated to the outside of the electric pump 100. The shielding plate 50 of this embodiment is made of ferritic stainless steel. The material of the shielding plate 50 is not limited to the material of this embodiment, and various materials such as silicon steel can be used.

[0043] The substrate 7 is disposed along a plane perpendicular to the central axis J. Based on a command from an external device (not shown), the substrate 7 passes a current through the coil 43 of the stator 40 to rotate the rotor 30. A control circuit such as an inverter circuit is mounted on the substrate 7.

[0044] As shown in FIG. 6, the substrate 7 is provided with a ground hole 7a and a connector hole 7b that penetrate the substrate 7 in the axial direction. A plating layer is provided on the inner surfaces of the ground hole 7a and the connector hole 7b. The plating layer is made of, for example, copper. The ground hole 7a and the connector hole 7b are so-called through holes. The plating layer of the ground hole 7a is electrically connected to the ground pattern of the substrate 7. A first conductive member 85 is inserted into the ground hole 7a. The plating layer of the connector hole 7b is electrically connected to a control circuit mounted on the substrate 7. A connector terminal 8 is inserted into the connector hole 7b.

[0045] The first conductive member 85 is conductive. The first conductive member 85 electrically connects the substrate 7 and the housing main body 80. The first conductive member 85 is made of a metal material with excellent conductivity. The metal material making up the first conductive member 85 is, for example, a copper alloy. The first conductive member 85 of this embodiment is a sheet metal member whose thickness direction is in the radial direction. Although the first conductive member 85 of this embodiment is made up of a single member, the first conductive member 85 may also be made up of multiple members that are electrically connected to each other.

[0046] The first conductive member 85 extends along the axial direction. The first conductive member 85 axially penetrates the support member 70. The first conductive member 85 is supported by the support member 70. The first conductive member 85 has a connecting portion 85a, a contact portion 85b, and an elastic portion 85c.

[0047] The connection portion 85a extends in the axial direction. The upper end of the connection portion 85a is the upper end of the first conductive member 85. The connection portion 85a is passed axially through a grounding hole 7a provided in the substrate 7. The connection portion 85a is, for example, a press-fit terminal. The connection portion 85a comes into contact with a plating layer provided on the inner surface of the grounding hole 7a. As a result, the first conductive member 85 is electrically connected to the ground pattern of the substrate 7 via the plating layer.

[0048] Note that the connecting portion 85a is not limited to a press-fit terminal, and may have a terminal shape that is inserted into the grounding hole 7a. In this case, a plating layer provided on the inner surface of the grounding hole 7a and the connecting portion 85a may be electrically connected by soldering, thereby electrically connecting the connecting portion 85a to the ground pattern of the substrate 7. In this case, a ground pattern may be disposed on the surface layer of the substrate 7, and the ground pattern and the connecting portion 85a may be directly connected by soldering.

[0049] The contact portion 85b is located lower than the connecting portion 85a. The contact portion 85b extends in the axial direction. The lower end portion of the contact portion 85b is the lower end portion of the first conductive member 85. The contact portion 85b is located radially outward than the connecting portion 85a. The radially outer surface of the contact portion 85b contacts the inner circumferential surface 80f of the housing main body 80. This electrically connects the first conductive member 85 to the housing main body 80.

[0050] The elastic portion 85c is located between the connecting portion 85a and the contact portion 85b. The elastic portion 85c connects the lower end of the connecting portion 85a and the upper end of the contact portion 85b. In this embodiment, the elastic portion 85c extends in a direction inclined obliquely toward the axial direction with respect to the radial direction. The elastic portion 85c is located lower as it extends radially outward. The radially inner end of the elastic portion 85c is connected to the lower end of the connecting portion 85a. The radially outer end of the elastic portion 85c is connected to the upper end of the contact portion 85b. The first conductive member 85 is bent in a crank shape at the elastic portion 85c.

[0051] 6, the state of contact portion 85b before elastic deformation of elastic portion 85c is shown by a two-dot chain line. When contact portion 85b comes into contact with inner circumferential surface 80f, elastic portion 85c elastically deforms in a direction that moves contact portion 85b radially inward. Furthermore, elastic deformation of elastic portion 85c presses contact portion 85b against inner circumferential surface 80f.

[0052] The first conductive member 85 of the present embodiment is electrically connected to the housing main body 80 at an inner circumferential surface 80f facing radially inward of the housing main body 80. According to the present embodiment, the electric pump 100 can be prevented from becoming larger in size, compared to when a member that electrically connects the board 7 and the housing main body 80 is disposed outside the housing main body 80.

[0053] The first conductive member 85 of this embodiment is elastically deformed and pressed against the inner circumferential surface 80f of the housing main body 80. According to this embodiment, in the process of assembling the electric pump 100, the first conductive member 85 can be easily electrically connected to the housing main body 80 by assembling the substrate 7, to which the first conductive member 85 is connected, to the housing main body 80. In other words, in the process of assembling the electric pump 100, a special process, such as a screwing process, for connecting the first conductive member 85 and the housing main body 80 is not required. According to the electric pump 100 of this embodiment, the assembly process can be simplified, and the electric pump 100 can be manufactured inexpensively.

[0054] As shown in FIG. 1 , the second conductive member 86 is attached to the radially outer surface of the housing main body 80. The second conductive member 86 is made of a metal material with excellent conductivity. The metal material constituting the second conductive member 86 is, for example, a copper alloy. The second conductive member 86 contacts the housing main body 80 and the inner surface 9b of the accommodating recess 9a. Therefore, the housing main body 80 and the attachment target 9 are electrically connected to each other via the second conductive member 86. The housing main body 80 is electrically connected to the board 7 by the first conductive member 85. This electrically connects the board 7 and the attachment target 9 via the first conductive member 85 and the second conductive member 86. Therefore, the ground pattern of the board 7 can be electrically connected to the attachment target 9, and the reference potential of the board 7 can be stabilized. As described above, according to this embodiment, the board 7 can be grounded with a simple structure using the first conductive member 85 and the second conductive member 86. In this embodiment, the second conductive member 86 contacts the peripheral wall surface 9d of the inner surface 9b of the accommodating recess 9a. The peripheral wall surface 9d is the radially inner surface of the receiving recess 9a.

[0055] As shown in FIGS. 2 and 3 , the second conductive member 86 has an annular shape surrounding the housing main body 80. Therefore, the second conductive member 86 can be easily attached to the housing main body 80 by, for example, fitting the housing main body 80 inside the second conductive member 86. Furthermore, the contact area between the second conductive member 86 and the radially outer surface of the housing main body 80 can be easily increased. This facilitates stable contact of the second conductive member 86 with the housing main body 80 and stable electrical connection of the second conductive member 86 to the housing main body 80. Furthermore, the portion of the second conductive member 86 that contacts the inner surface of the accommodating recess 9a, i.e., the contact portion 86b described below, can be provided at any position in the circumferential direction. This allows for a large number of contact portions 86b, which facilitates a large contact area between the second conductive member 86 and the inner surface of the accommodating recess 9a. This facilitates stable contact of the second conductive member 86 with the attachment target 9 and stable electrical connection of the second conductive member 86 to the attachment target 9.

[0056] In this embodiment, the second conductive member 86 is a sheet metal member. The second conductive member 86 is made, for example, by pressing a single metal plate member. The second conductive member 86 may also be made by joining multiple metal members. The second conductive member 86 has an annular portion 86a and a contact portion 86b.

[0057] The annular portion 86a has an annular shape surrounding the housing main body 80. In this embodiment, the annular portion 86a has a substantially circular annular shape centered on the central axis J. As shown in FIG. 3, in this embodiment, the annular portion 86a is formed by bending a plate-like member extending in one direction in the thickness direction and connecting both ends of the plate-like member with a crimped portion 86e. The axial dimension of the annular portion 86a is constant around the entire circumference. However, the axial dimension of the annular portion 86a may vary depending on the circumferential position. As shown in FIG. 4, the annular portion 86a contacts the radially outer surface of the housing main body 80. Therefore, the second conductive member 86 can easily contact the radially outer surface of the housing main body 80 around the entire circumference via the annular portion 86a. This makes it easy to increase the contact area between the second conductive member 86 and the housing main body 80. In this embodiment, the annular portion 86a is located below the stator 40.

[0058] As shown in FIG. 3, the annular portion 86a has a protruding portion 86c that protrudes radially outward. The protruding portion 86c is formed by bending a portion of the annular portion 86a. More specifically, the protruding portion 86c is formed by bending a circumferential portion of the annular portion 86a radially outward. The protruding portion 86c has a substantially V-shape that opens radially inward when viewed from the axial direction. The protruding portion 86c is elastically deformable in a direction that expands in the circumferential direction. The inner diameter of the annular portion 86a increases as a result of the protruding portion 86c elastically deforming in a direction that expands in the circumferential direction.

[0059] When the protrusion 86c is not elastically deformed, the inner diameter of the annular portion 86a is smaller than the outer diameter of the portion of the housing main body 80 where the second conductive member 86 is attached, i.e., the outer diameter of the stator accommodating portion 81. Therefore, when the second conductive member 86 is attached to the radially outer surface of the stator accommodating portion 81, the protrusion 86c elastically deforms in a direction expanding in the circumferential direction, and the inner diameter of the annular portion 86a is expanded radially outward and becomes larger. Thus, in this embodiment, the annular portion 86a contacts the radially outer surface of the housing main body 80 in an elastically deformed state. Therefore, the annular portion 86a is pressed against the radially outer surface of the housing main body 80 by a force that attempts to restore its original deformation. This allows the annular portion 86a to stably contact the radially outer surface of the housing main body 80.

[0060] In this embodiment, the annular portion 86a has a protruding portion 86c that protrudes radially outward, and the protruding portion 86c is formed by bending a portion of the annular portion 86a. Therefore, as described above, by elastically deforming the protruding portion 86c in the circumferential direction, the annular portion 86a can be easily elastically deformed, and the inner diameter of the annular portion 86a can be easily increased. This makes it easy for an operator to elastically deform the annular portion 86a to increase the inner diameter of the annular portion 86a when attaching the second conductive member 86 to the housing main body 80. This makes it easy to attach the second conductive member 86 to the housing main body 80. Furthermore, the annular portion 86a can be easily brought into contact with the radially outer surface of the housing main body 80 in its elastically deformed state.

[0061] In this specification, the term "workers, etc." includes the workers who perform each task and the equipment, etc. Each task may be performed by the worker alone, by the equipment alone, or by both the worker and the equipment.

[0062] In this embodiment, the protrusions 86c are provided at intervals in the circumferential direction. The protrusions 86c are arranged at equal intervals around the circumference. For example, three protrusions 86c are provided.

[0063] The annular portion 86a has a protrusion 86d that protrudes radially inward. The protrusion 86d is provided on the radially inner surface of the annular portion 86a. The protrusion 86d is provided in the axial center of the annular portion 86a. A plurality of protrusions 86d are provided at intervals in the circumferential direction. In this embodiment, the protrusion 86d is a portion formed by crimping a part of the annular portion 86a from the radially outer side to the radially inner side. The protrusion 86d has a generally hemispherical shell shape that protrudes radially inward.

[0064] As shown in FIG. 5 , the protrusion 86d is positioned within the recess 87. In this embodiment, the protrusion 86d fits into the recess 87. The protrusion 86d is positioned below the first hook 87a of the recess 87 and faces the first hook 87a. This allows the protrusion 86d to be hooked onto the first hook 87a from below. This prevents the annular portion 86a from shifting upward relative to the housing main body 80. In particular, when the electric pump 100 is inserted into the accommodating recess 9a from above, the contact portion 86b rubs against the peripheral wall surface 9d of the accommodating recess 9a, which tends to apply an upward force to the second conductive member 86. Even in this case, the protrusion 86d is hooked onto the first hook 87a from below, thereby preventing the second conductive member 86 from shifting upward relative to the housing main body 80.

[0065] In this embodiment, the first hook portion 87a is a surface located on the upper side of the inner surface of the recessed portion 87. By configuring the first hook portion 87a by the inner surface of the recessed portion 87, the protrusion 86d can be hooked from below onto the first hook portion 87a, and the protrusion 86d can also be hooked from above onto the surface located on the lower side of the inner surface of the recessed portion 87, i.e., the second hook portion 87b. This makes it possible to prevent the annular portion 86a from shifting downward relative to the housing main body 80. Therefore, it is possible to prevent the second conductive member 86 from shifting to either side in the axial direction relative to the housing main body 80.

[0066] In the present embodiment, the recess 87 is an annular groove surrounding the central axis J. Therefore, regardless of the circumferential position of the second conductive member 86 relative to the circumferential position of the housing main body 80, the protrusion 86d can be inserted into the recess 87, and the protrusion 86d can be hooked in the axial direction by the first hook portion 87a and the second hook portion 87b. Furthermore, even when a plurality of protrusions 86d are provided at intervals in the circumferential direction as in the present embodiment, the plurality of protrusions 86d can be inserted into the recess 87, which is an annular groove, and the plurality of protrusions 86d can be hooked in the axial direction by the first hook portion 87a and the second hook portion 87b.

[0067] In this embodiment, the protrusion 86d comes into contact with the first hook portion 87a and the second hook portion 87b. The protrusion 86d may face the first hook portion 87a in the axial direction with a gap therebetween, or may face the second hook portion 87b with a gap therebetween.

[0068] The provision of the protrusion 86d and the recess 87 also makes it easy to position the second conductive member 86 in the axial direction with respect to the housing main body 80 when attaching the second conductive member 86 to the housing main body 80. For example, when attaching the second conductive member 86 to the housing main body 80, an operator passes the housing main body 80 inside the second conductive member 86 without widening the inner diameter of the second conductive member 86 in advance. In this case, the operator first passes the pump cover fitting portion 83 and the pump mechanism accommodating portion 82, which have smaller outer diameters than the stator accommodating portion 81, inside the second conductive member 86. The operator moves the second conductive member 86 upward relative to the housing main body 80 and passes it through the connection portion between the pump mechanism accommodating portion 82 and the stator accommodating portion 81, thereby widening the second conductive member 86 by utilizing the difference in outer diameter of the housing main body 80. When the portion of the stator accommodating portion 81 located below the recessed portion 87 is inserted inside the second conductive member 86, the radially inner ends of the multiple protrusions 86d come into contact with the radially outer surface of the stator accommodating portion 81. In this state, when the second conductive member 86 is moved upward with respect to the stator accommodating portion 81 and the axial positions of the multiple protrusions 86d become the same as the axial position of the recessed portion 87, the second conductive member 86 undergoes restoration deformation, and the multiple protrusions 86d fit into the recessed portion 87. This makes it possible to easily attach the second conductive member 86 to the housing main body 80 while the second conductive member 86 is positioned axially relative to the housing main body 80.

[0069] In addition, before passing the housing main body portion 80 inside the second conductive member 86, the worker or the like may apply force to the second conductive member 86 to push the second conductive member 86 apart, and then pass the housing main body portion 80 inside the second conductive member 86.

[0070] As shown in FIG. 4, the contact portion 86b is connected to the annular portion 86a. The contact portion 86b contacts the radially inner surface of the accommodating recess 9a, i.e., the peripheral wall surface 9d. By providing the contact portion 86b that contacts the peripheral wall surface 9d of the accommodating recess 9a as a separate portion from the annular portion 86a that contacts the housing main body 80, the contact portion 86b can be shaped to easily contact the peripheral wall surface 9d. In other words, the degree of freedom in the shape of the contact portion 86b can be improved. Therefore, the annular portion 86a increases the contact area between the second conductive member 86 and the housing main body 80, and the second conductive member 86 can be easily contacted with the peripheral wall surface 9d of the accommodating recess 9a via the contact portion 86b.

[0071] In this embodiment, the contact portion 86b protrudes upward beyond the annular portion 86a. Therefore, when inserting the electric pump 100 into the accommodating recess 9a from above, the distance that the contact portion 86b moves in the axial direction while in contact with the peripheral wall surface 9d can be made shorter than when the annular portion 86a protrudes downward beyond the contact portion 86b. This makes it easier to insert the electric pump 100 into the accommodating recess 9a.

[0072] In this embodiment, the contact portion 86b has a plate-like shape with a plate surface facing radially. The contact portion 86b is bent to have a shape that is convex radially outward. The contact portion 86b is elastically deformable in the radial direction. When the contact portion 86b is not elastically deformed, it has a portion that is located radially outward from the circumferential wall surface 9d. When the electric pump 100 is inserted into the accommodating recess 9a, the contact portion 86b is pushed radially inward by the circumferential wall surface 9d and elastically deforms. Thus, in this embodiment, the contact portion 86b contacts the radially inner side surface of the accommodating recess 9a, i.e., the circumferential wall surface 9d, in the elastically deformed state. As a result, the contact portion 86b is pressed radially inward against the circumferential wall surface 9d by a force that attempts to restore its original deformation. Therefore, the contact portion 86b can be stably brought into contact with the circumferential wall surface 9d.

[0073] The contact portion 86b has a first inclined portion 86f. The first inclined portion 86f extends upward and radially outward from the upper edge of the annular portion 86a. The first inclined portion 86f is positioned radially outward as it extends upward. The upper end of the first inclined portion 86f contacts the radially inner surface of the accommodating recess 9a, i.e., the circumferential wall surface 9d. Therefore, when the electric pump 100 is inserted into the accommodating recess 9a from above, the lower end of the first inclined portion 86f, which is positioned radially inward relative to the upper end, is inserted into the accommodating recess 9a first. This prevents the first inclined portion 86f from getting caught on the circumferential wall surface 9d of the accommodating recess 9a when the electric pump 100 is inserted into the accommodating recess 9a from above. Furthermore, when the contact portion 86b contacts the peripheral wall surface 9d in an elastically deformed state as in this embodiment, before the electric pump 100 is inserted into the accommodating recess 9a, the upper end of the first inclined portion 86f that contacts the peripheral wall surface 9d is positioned radially outward from the peripheral wall surface 9d. In this case, when the electric pump 100 is inserted into the accommodating recess 9a from above, the first inclined portion 86f is positioned radially outward as it extends upward. This allows the first inclined portion 86f to be inserted into the accommodating recess 9a from its lower end, which is positioned radially inward from the peripheral wall surface 9d. Furthermore, the portion of the first inclined portion 86f that is positioned radially outward from the peripheral wall surface 9d contacts the upper edge of the accommodating recess 9a from above, so that the first inclined portion 86f is pushed by the upper edge of the accommodating recess 9a and elastically deforms radially inward. This allows the second conductive member 86 to be easily inserted into the accommodating recess 9a with the first inclined portion 86f in contact with the peripheral wall surface 9d. As a result, the electric pump 100 provided with the second conductive member 86 can be easily inserted into the accommodation recess 9a.

[0074] The contact portion 86b has a second inclined portion 86g. The second inclined portion 86g is connected to the upper end of the first inclined portion 86f. The second inclined portion 86g extends upward and radially inward from the upper end of the first inclined portion 86f. The second inclined portion 86g is positioned radially inward as it extends upward. Therefore, the upper end of the first inclined portion 86f that contacts the peripheral wall surface 9d can be used as the connection portion between the first inclined portion 86f and the second inclined portion 86g. This makes it easier to form a smooth shape for the portion of the second conductive member 86 that contacts the peripheral wall surface 9d compared to when the upper end of the first inclined portion 86f is a cut surface. Therefore, when the electric pump 100 is inserted into the installation recess 9a, the second conductive member 86 is more likely to be caught on the peripheral wall surface 9d. In this embodiment, the connection portion between the first inclined portion 86f and the second inclined portion 86g has an arc shape that convex radially outward.

[0075] The inclination of the second inclined portion 86g with respect to the axial direction is smaller than the inclination of the first inclined portion 86f with respect to the axial direction. The length of the second inclined portion 86g is shorter than the length of the first inclined portion 86f. The length of the first inclined portion 86f is the dimension of the first inclined portion 86f in the direction in which the first inclined portion 86f extends in a cross section perpendicular to the circumferential direction. The length of the second inclined portion 86g is the dimension of the second inclined portion 86g in the direction in which the second inclined portion 86g extends in a cross section perpendicular to the circumferential direction. The upper end of the second inclined portion 86g is located radially outward of the lower end of the first inclined portion 86f.

[0076] In this embodiment, at least a portion of the contact portion 86b overlaps with the stator 40 in the radial direction. In this embodiment, an upper portion of the first inclined portion 86f and the entire second inclined portion 86g overlap with the stator 40 in the radial direction.

[0077] As shown in FIG. 3, in this embodiment, a plurality of contact portions 86b are provided at intervals in the circumferential direction around the central axis J. The plurality of contact portions 86b are arranged at equal intervals around one circumference in the circumferential direction. The plurality of contact portions 86b includes a pair of contact portions 86b arranged on either side of the central axis J. In this embodiment, three pairs of contact portions 86b are provided. That is, in this embodiment, six contact portions 86b are provided.

[0078] As shown in FIG. 2 , the multiple contact portions 86b surround the housing main body 80. This allows the contact portions between the second conductive member 86 and the peripheral wall surface 9d of the accommodating recess 9a to be suitably distributed around the circumference. This suppresses radial vibration of the electric pump 100 within the accommodating recess 9a. In particular, when the multiple contact portions 86b contact the peripheral wall surface 9d of the accommodating recess 9a in an elastically deformed state, as in the present embodiment, the second conductive member 86 and the housing main body 80 are subjected to a radially inward force due to a reaction force of the restoring force applied to the peripheral wall surface 9d by each contact portion 86b. The radially inward force applied by each of the multiple contact portions 86b surrounding the housing main body 80 acts on the second conductive member 86 and the housing main body 80, thereby aligning the second conductive member 86 and the housing main body 80 with respect to the central axis J. This makes it possible to further suppress vibration of the electric pump 100 within the accommodating recess 9a, and also to position the electric pump 100 with good axial accuracy within the accommodating recess 9a.

[0079] The circumferential dimension of the contact portion 86b is smaller than the axial dimension of the annular portion 86a. The upper edge of the contact portion 86b has a semicircular arc shape that is convex upward. In this embodiment, the upper edge of the contact portion 86b is the upper edge of the second inclined portion 86g.

[0080] Below, embodiments different from the above-described embodiments will be described. In the following description of each embodiment, the same configurations as those described above in the description of each embodiment may be omitted by appropriately assigning the same reference numerals. Furthermore, parts corresponding to the respective parts of the configurations described above in the description of each embodiment may be assigned the same names but different reference numerals, and differences from the above-described configurations may be described, while similar configurations to the above-described configurations may be omitted. Note that, as the configurations whose description is omitted in each of the following embodiments, configurations similar to the configurations described above in the description of each embodiment may be adopted within the scope of not being inconsistent.

[0081] Second Embodiment As shown in FIG. 7 , in the electric pump 200 of this embodiment, the contact portion 286b of the second conductive member 286 protrudes downward from the annular portion 86a. Therefore, the position where the contact portion 286b contacts the peripheral wall surface 9d of the accommodating recess 9a can be positioned lower than in the first embodiment. This makes it easier to position the position where the contact portion 286b contacts the peripheral wall surface 9d away from the mounting surface 9f provided around the upper opening of the accommodating recess 9a in the axial direction. This increases the axial distance between the portion of the electric pump 200 fixed to the mounting surface 9f and the portion of the electric pump 200 that contacts the peripheral wall surface 9d of the accommodating recess 9a. This makes it easier to stably support the electric pump 200 relative to the mounting object 9.

[0082] The contact portion 286b has a shape obtained by inverting the contact portion 86b in the first embodiment in the axial direction. The contact portion 286b has a first inclined portion 286f and a second inclined portion 286g. The first inclined portion 286f has a shape obtained by inverting the second inclined portion 86g in the first embodiment in the axial direction. The second inclined portion 286g has a shape obtained by inverting the first inclined portion 86f in the first embodiment in the axial direction. In this embodiment, of the two inclined portions, the first inclined portion 286f and the second inclined portion 286g, the inclined portion connected to the annular portion 86a is the second inclined portion 286g, and the inclined portion connected to the axial end of the inclined portion connected to the annular portion 86a is the first inclined portion 286f.

[0083] The second inclined portion 286g extends downward and radially outward from the lower edge of the annular portion 86a. The second inclined portion 286g is positioned radially inward as it extends upward. The second inclined portion 286g is connected to the upper end of the first inclined portion 286f. The first inclined portion 286f is connected to the lower end of the second inclined portion 286g. The first inclined portion 286f extends downward and radially inward from the lower end of the second inclined portion 286g. The first inclined portion 286f is positioned radially outward as it extends upward. The upper end of the first inclined portion 286f contacts the radially inner surface of the accommodating recess 9a, i.e., the peripheral wall surface 9d. The inclination of the first inclined portion 286f with respect to the axial direction is smaller than the inclination of the second inclined portion 286g with respect to the axial direction. The length of the first inclined portion 286f is shorter than the length of the second inclined portion 286g. The lower end of the first inclined portion 286f is located radially outward of the upper end of the second inclined portion 286g.

[0084] In the present embodiment, as in the first embodiment, the substrate 7 can be grounded with a simple structure using the first conductive member 85 and the second conductive member 286. Furthermore, by providing the first inclined portion 286f, an effect similar to that obtained by the first inclined portion 86f in the first embodiment can be obtained. By providing the second inclined portion 286g, an effect similar to that obtained by the second inclined portion 86g in the first embodiment can be obtained. The other configurations of the second conductive member 286 are the same as the other configurations of the second conductive member 86 in the first embodiment. The other configurations of the electric pump 200 are the same as the other configurations of the electric pump 100 in the first embodiment.

[0085] Third Embodiment As shown in FIG. 8 , in the electric pump 300 of this embodiment, the contact portion of the second conductive member 386 includes a first contact portion 386b and a second contact portion 386c. The first contact portion 386b is a contact portion that protrudes upward from the annular portion 86a. The second contact portion 386c is a contact portion that protrudes downward from the annular portion 86a. Therefore, the first contact portion 386b and the second contact portion 386c can increase the contact area between the second conductive member 386 and the peripheral wall surface 9d of the accommodating recess 9a. This allows for a more stable electrical connection between the second conductive member 386 and the attachment object 9.

[0086] The first contact portion 386b has a configuration similar to that of the contact portion 86b in the first embodiment. The second contact portion 386c has a configuration similar to that of the contact portion 286b in the second embodiment. Although not shown, the first contact portion 386b and the second contact portion 386c are each provided in plurality at intervals in the circumferential direction.

[0087] In the present embodiment, as in the first embodiment, the substrate 7 can be grounded with a simple structure using the first conductive member 85 and the second conductive member 386. Other configurations of the second conductive member 386 are the same as other configurations of the second conductive member 86 in the first embodiment. Other configurations of the electric pump 300 are the same as other configurations of the electric pump 100 in the first embodiment.

[0088] The present invention is not limited to the above-described embodiments, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The second conductive member may have any configuration as long as it contacts the housing main body and the inner surface of the accommodating recess. Multiple second conductive members may be provided. The second conductive member does not have to be annular. When the second conductive member has an annular portion and a contact portion, the annular portion and the contact portion may be separate from each other. When the second conductive member has an annular portion and a contact portion, the number of contact portions is not particularly limited as long as it is one or more. The use of the electric pump to which the present invention is applied is not particularly limited. The electric pump may be installed in any device.

[0089] The present technology can be configured as follows. (1) An electric pump accommodated in an accommodating recess of an object to be mounted, the electric pump comprising: a motor section having a rotor provided with a shaft rotatable around a central axis and a stator facing the rotor across a gap; a circuit board electrically connected to the stator; a pump mechanism connected to one axial side of the shaft; a housing accommodating the motor section, the circuit board, and the pump mechanism; a first conductive member; and a second conductive member, the housing having a metal housing main body section accommodating the stator inside, and a pump cover connected to one axial end of the housing main body section and covering the pump mechanism from one axial side, the first conductive member electrically connecting the circuit board and the housing main body section, and the second conductive member contacting the housing main body section and the inner surface of the accommodating recess. (2) The electric pump according to (1), wherein the second conductive member is annular and surrounds the housing main body. (3) The electric pump described in (2), wherein the second conductive member has a ring-shaped annular portion surrounding the housing main body portion and a contact portion connected to the annular portion, the ring-shaped portion contacting the radially outer surface of the housing main body portion and the contact portion contacting the radially inner surface of the accommodating recess. (4) The electric pump according to (3), wherein the contact portions are provided at intervals in a circumferential direction around the central axis, and the contact portions surround the housing main body. (5) The electric pump according to (3) or (4), wherein the contact portion has a first inclined portion positioned radially outward as it approaches the other axial side, and an end portion on the other axial side of the first inclined portion contacts the radially inner surface of the accommodating recess. (6) The electric pump described in (5), wherein the contact portion has a second inclined portion connected to the end portion on the other axial side of the first inclined portion, and the second inclined portion is positioned radially inward as it approaches the other axial side. (7) The electric pump according to any one of (3) to (6), wherein the contact portion contacts a radially inner surface of the accommodation recess in an elastically deformed state. (8) The electric pump according to any one of (3) to (7), wherein the annular portion contacts a radially outer surface of the housing main body in an elastically deformed state. (9) The electric pump according to (8), wherein the annular portion has a protruding portion that protrudes radially outward, and the protruding portion is configured by bending a portion of the annular portion. (10) An electric pump described in any one of (3) to (9), wherein the annular portion has a convex portion that protrudes radially inward, and the housing main body portion has a hook portion that hooks onto the convex portion from one axial side. (11) An electric pump as described in (10), wherein a recess recessed radially inward is provided on the radially outer surface of the housing main body, and the hook portion is a surface located on the other axial side of the inner surface of the recess. (12) The electric pump according to (11), wherein the recess is an annular groove surrounding the central axis. (13) The electric pump according to any one of (3) to (12), wherein the contact portion protrudes further toward the other axial direction than the annular portion. (14) The electric pump according to any one of (3) to (12), wherein the contact portion protrudes further toward one axial direction than the annular portion. (15) The electric pump according to any one of (3) to (12), wherein the contact portion includes a first contact portion that protrudes from the annular portion toward one side in the axial direction, and a second contact portion that protrudes from the annular portion toward the other side in the axial direction.

[0090] The configurations and methods described in this specification can be combined as appropriate within the scope of not being mutually contradictory. [Explanation of symbols]

[0091] 6...housing, 7...board, 9...mounting object, 9a...accommodating recess, 9b...inner surface, 10...motor portion, 20...pump mechanism, 30...rotor, 31...shaft, 40...stator, 80...housing main body portion, 85...first conductive member, 86, 286, 386...second conductive member, 86a...annular portion, 86b, 286b...contact portion, 86c...protruding portion, 86d...convex portion, 86f, 286f...first inclined portion, 86g, 286g...second inclined portion, 87...recess, 87a...first hook portion (hook portion), 90...pump cover, 100, 200, 300...electric pump, 386b...first contact portion, 386c...second contact portion, J...central axis

Claims

1. An electric pump accommodated in an accommodating recess of an attachment target, a motor section including a rotor provided with a shaft rotatable about a central axis, and a stator facing the rotor with a gap therebetween; a substrate electrically connected to the stator; a pump mechanism connected to one axial side of the shaft; a housing that accommodates the motor unit, the substrate, and the pump mechanism therein; a first conductive member; A second conductive member; Equipped with The housing includes: a metal housing body that accommodates the stator therein; a pump cover connected to one axial end of the housing body and covering the pump mechanism from one axial side; and the first conductive member electrically connects the substrate and the housing main body; The second conductive member contacts the housing main body and an inner surface of the accommodating recess.

2. The electric pump according to claim 1 , wherein the second conductive member is annular and surrounds the housing main body.

3. The second conductive member is an annular portion surrounding the housing main body; a contact portion connected to the annular portion; and the annular portion contacts a radially outer surface of the housing main body, The electric pump according to claim 2 , wherein the contact portion contacts a radially inner surface of the accommodating recess.

4. The contact portions are provided in a plurality at intervals in the circumferential direction around the central axis, The electric pump according to claim 3 , wherein the plurality of contact portions surround the housing body portion.

5. the contact portion has a first inclined portion positioned radially outward as it extends toward the other axial side, The electric pump according to claim 3 , wherein the other axial end of the first inclined portion contacts a radially inner surface of the accommodation recess.

6. the contact portion has a second inclined portion connected to an end portion on the other axial side of the first inclined portion, The electric pump according to claim 5 , wherein the second inclined portion is positioned radially inward as it approaches the other axial side.

7. The electric pump according to claim 3 , wherein the contact portion contacts a radially inner surface of the accommodation recess in an elastically deformed state.

8. The electric pump according to claim 3 , wherein the annular portion contacts a radially outer surface of the housing body in an elastically deformed state.

9. The annular portion has a protruding portion that protrudes radially outward, The electric pump according to claim 8 , wherein the protruding portion is formed by bending a part of the annular portion.

10. The annular portion has a protrusion that protrudes radially inward, The electric pump according to claim 3 , wherein the housing body has a hook portion on which the protrusion is hooked from one axial side.

11. a recessed portion recessed radially inward is provided on a radially outer surface of the housing main body, The electric pump according to claim 10 , wherein the hook portion is a surface of the inner surface of the recess that is located on the other axial side.

12. The electric pump according to claim 11, wherein the recess is an annular groove surrounding the central axis.

13. The electric pump according to claim 3 , wherein the contact portion protrudes further axially toward the other side than the annular portion.

14. The electric pump according to claim 3 , wherein the contact portion protrudes further axially toward one side than the annular portion.

15. The contact portion is a first contact portion that protrudes from the annular portion toward one axial side; a second contact portion that protrudes further toward the other axial side than the annular portion; 13. The electric pump of claim 3, further comprising:

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