Rotating electric machines and pumps

Abstract

To provide a rotary electric machine and a pump that have a structure capable of reducing the number of components.SOLUTION: A rotary electric machine 10 includes a rotor, a stator 42, a substrate 80, a busbar assembly 50, a housing 30 having a stator housing portion 35 and a substrate housing portion 37, and a cover member 60. The housing 30 has a connection hole through which the inside of the stator housing portion 35 and the inside of the board housing portion 37 are connected to each other. The busbar assembly 50 is passed through the connection hole in the radial direction. The busbar assembly 50 is located on one side in the axial direction of the stator 42 inside the stator housing portion 35. The cover member 60 has a facing portion located on one side in the axial direction of the busbar assembly 50 inside the stator housing portion 35. The facing portion has an axial-direction positioning portion for positioning the busbar assembly in the axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] For example, Patent Document 1 describes an electric oil pump having a structure in which a substrate is located radially outside a cylindrical portion of a motor housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-178648 A Summary of the Invention [Problem to be solved by the invention]

[0004] The electric oil pump in Patent Document 1 includes a busbar assembly having a coupling busbar connected to a coil end, and a connection busbar assembly having a connection busbar connecting the coupling busbar and a board, which increases the number of parts and increases the number of steps required to assemble the electric oil pump.

[0005] In view of the above circumstances, an object of the present invention is to provide a rotating electric machine and a pump having a structure that can reduce the number of parts. [Means for solving the problem]

[0006] One aspect of the rotating electric machine of the present invention is a rotor that can rotate around a central axis extending in an axial direction. A stator having a rotor and a coil and facing the rotor with a gap therebetween, and an electric current is applied to the coil. a bus bar electrically connecting the coil and the substrate; A busbar assembly having a busbar holder for holding a busbar, and a stator and a substrate receiving portion for receiving the substrate therein. and a cover member having a cylindrical portion surrounding one end of the stator in the axial direction. The substrate accommodating portion is located radially outward of the stator accommodating portion. The connecting hole connects the inside of the stator housing portion and the inside of the board housing portion. The bus bar assembly is passed through the stator in a radial direction. a coil connection portion electrically connected to the coil in the housing portion; and a board connection portion electrically connected to the board. is located on one axial side of the stator in the stator housing portion. The housing has an opening that opens to one side in the axial direction. The cover member covers the bus bar conductor in the stator housing portion. The busbar assembly has an opposing portion located on one axial side of the busbar assembly. The opposing portion has an axial positioning portion for positioning the busbar assembly in the axial direction. and further comprising an elastic member located between the lid member and the cover member in an axial direction and applying a force to the cover member in a direction toward the other axial direction, the elastic member having a held portion held on one axial side of the opposing portion, and a contact portion connected to the held portion and contacting the lid member from the other axial side. Rotating electric motor. Also, one aspect of the rotating electric machine of the present invention includes a rotor rotatable about a central axis extending in the axial direction, a stator having a coil and facing the rotor with a gap therebetween, a substrate electrically connected to the coil, a busbar assembly having a busbar electrically connecting the coil and the substrate and a busbar holder for holding the busbar, a housing having a stator accommodating portion for accommodating the stator therein and a substrate accommodating portion for accommodating the substrate therein, and a cover member having a cylindrical portion surrounding one end of the stator in the axial direction. The substrate accommodating portion is located radially outside the stator accommodating portion. The housing has a connection hole connecting an inside of the stator accommodating portion to an inside of the substrate accommodating portion. The busbar assembly is passed through the connection hole in the radial direction. The busbar has a coil connection portion electrically connected to the coil in the stator accommodating portion and a substrate connection portion electrically connected to the substrate in the substrate accommodating portion. The busbar assembly is located on one axial side of the stator in the stator accommodating portion. a rotating electric machine including: a stator accommodating portion having an opening that opens to one axial side; a housing having a lid member that closes the opening; a cover member having an opposing portion that is located on one axial side of the busbar assembly within the stator accommodating portion; and a facing portion having an axial positioning portion that positions the busbar assembly in the axial direction, the facing portion having a radial positioning portion that positions the busbar assembly in the radial direction. Also, one aspect of the rotating electric machine of the present invention includes a rotor rotatable about a central axis extending in the axial direction, a stator having a coil and facing the rotor with a gap therebetween, a substrate electrically connected to the coil, a busbar assembly having a busbar electrically connecting the coil and the substrate and a busbar holder for holding the busbar, a housing having a stator accommodating portion for accommodating the stator therein and a substrate accommodating portion for accommodating the substrate therein, and a cover member having a cylindrical portion surrounding one end of the stator in the axial direction. The substrate accommodating portion is located radially outside the stator accommodating portion. The housing has a connection hole connecting an inside of the stator accommodating portion to an inside of the substrate accommodating portion. The busbar assembly is passed through the connection hole in the radial direction. The busbar has a coil connection portion electrically connected to the coil in the stator accommodating portion and a substrate connection portion electrically connected to the substrate in the substrate accommodating portion. The busbar assembly is located on one axial side of the stator in the stator accommodating portion. a rotating electric machine, the stator accommodating portion having an opening that opens to one axial side, the housing having a lid member that closes the opening, the cover member having an opposing portion located on one axial side of the bus bar assembly within the stator accommodating portion, the opposing portion having an axial positioning portion that positions the bus bar assembly in the axial direction, the cylindrical portion being fitted to an inner circumferential surface of the stator accommodating portion, the cylindrical portion having an elastic deformation portion that is elastically deformable in a radial direction, and the elastic deformation portion being pressed against the inner circumferential surface of the stator accommodating portion from the radially inner side.

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

[0008] According to one aspect of the present invention, the number of parts in a rotating electrical machine and a pump can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a portion of a pump according to an embodiment. [Diagram 2]FIG. 2 is an exploded perspective view showing a part of the rotating electric machine according to the embodiment. [Diagram 3] FIG. 3 is a perspective view showing a portion of a housing and a portion of a bus bar assembly of one embodiment. [Figure 4] FIG. 4 is a perspective view illustrating a portion of a stator and a busbar assembly according to one embodiment. [Diagram 5] FIG. 5 is a cross-sectional perspective view illustrating a portion of the busbar assembly and a portion of the cover member according to one embodiment. [Figure 6] FIG. 6 is a perspective view illustrating a bus bar assembly and a cover member according to one embodiment. [Figure 7] FIG. 7 is a perspective view showing a cover member and an elastic member according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the following description, the figures show the X-axis, Y-axis, and Z-axis as appropriate. The Y-axis indicates the direction in which the central axis J of the rotating electric machine of the embodiment described below extends. The central axis J shown in each figure is a virtual axis line. In the following description, the direction in which the central axis J extends, i.e., the direction parallel to the Y-axis, is called the "axial direction". The radial direction centered on the central axis J is simply called the "radial direction". The circumferential direction centered on the central axis J is simply called the "circumferential direction". The side in the axial direction toward which the Y-axis arrow points (+Y side) is called the "one axial side". The side in the axial direction opposite to the side toward which the Y-axis arrow points (-Y side) is called the "other axial side".

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

[0012] The direction parallel to the Z axis is called the "vertical direction Z". The side of the vertical direction Z toward which the arrow of the Z axis points (+Z side) is called the "upper side". The opposite side of the vertical direction Z to the side toward which the arrow of the Z axis points (-Z side) is called the "lower side". The direction parallel to the X axis is called the "width direction X". The side of the width direction X toward which the arrow of the X axis points (+X side) is called the "one side in the width direction". The opposite side of the width direction X to the side toward which the arrow of the X axis points (-X side) is called the "other side in the width direction". The axial direction, the vertical direction Z, and the width direction X are mutually orthogonal. Note that the vertical direction Z, the width direction X, the upper side, and the lower side are names simply used to explain the positional relationship of each part, and the actual positional relationship may be a positional relationship other than the positional relationship indicated by these names.

[0013] 1 and 2, a pump 100 according to the present embodiment is an electric pump attached to an apparatus mounted on a vehicle. The apparatus to which the pump 100 is attached may be an automatic transmission or a drive unit that drives an axle of the vehicle. The pump 100 is, for example, an electric oil pump that supplies oil to the apparatus mounted on the vehicle.

[0014] 1, the pump 100 includes a rotating electric machine 10 and a pump mechanism 20. In this embodiment, the rotating electric machine 10 is a motor. The rotating electric machine 10 includes a housing 30, a rotor 41, a stator 42, bearings 43a, 43b, a busbar assembly 50, a cover member 60, an elastic member 70, and a substrate 80.

[0015] The rotor 41 is rotatable around a central axis J extending in the axial direction. The rotor 41 has a shaft 41a and a rotor body 41b. The shaft 41a is cylindrical and extends in the axial direction around the central axis J. The shaft 41a is supported by a bearing 43a and a bearing 43b so as to be rotatable around the central axis J. That is, the bearings 43a and 43b rotatably support the rotor 41. In this embodiment, the bearings 43a and 43b are rolling bearings. The bearings 43a and 43b are ball bearings. The bearing 43a rotatably supports a portion of the shaft 41a located on one axial side (+Y side) of the rotor body 41b. The bearing 43b rotatably supports a portion of the shaft 41a located on the other axial side (-Y side) of the rotor body 41b. The rotor body 41b is fixed to the outer circumferential surface of the shaft 41a. Although not shown, the rotor body 41b has a rotor core and a rotor magnet.

[0016] The stator 42 faces the rotor 41 with a gap therebetween. The stator 42 is located radially outward of the rotor 41. The stator 42 has a stator core 42a, an insulator 42b, and a plurality of coils 42c. The stator core 42a has a cylindrical core back 42d centered on the central axis J, and a plurality of teeth 42e extending radially inward from the core back 42d. The stator core 42a is fixed in a stator housing portion 35 described later. More specifically, the outer peripheral surface of the core back 42d is fixed to the inner peripheral surface of the stator housing portion 35. The plurality of coils 42c are attached to the plurality of teeth 42e via the insulator 42b. Each coil 42c has a coil end 42g protruding toward one axial side (+Y side) from the stator core 42a.

[0017] The housing 30 accommodates therein the pump mechanism 20, the rotor 41, the stator 42, the bearings 43a, 43b, the bus bar assembly 50, the cover member 60, the elastic member 70, and the substrate 80. The housing 30 has a housing main body 31, a substrate cover 32, a lid member 33, and a pump cover 34. The housing main body 31, the substrate cover 32, the lid member 33, and the pump cover 34 are separate members. The substrate cover 32 is fixed to the upper side of the housing main body 31. The lid member 33 is fixed to one axial side (+Y side) of the housing main body 31. The pump cover 34 is fixed to the other axial side (-Y side) of the housing main body 31.

[0018] The housing main body 31 has a stator accommodating portion 35, a pump accommodating portion 36, a board accommodating portion 37, and an attachment portion 38. In this embodiment, the stator accommodating portion 35, the pump accommodating portion 36, the board accommodating portion 37, and the attachment portion 38 are all part of the same single member. The attachment portion 38 is located on the other widthwise side (-X side) of the stator accommodating portion 35 and the pump accommodating portion 36. The attachment portion 38 is a portion that is fixed to a vehicle device by a screw.

[0019] The stator accommodating portion 35 accommodates the rotor body 41b, the stator 42, the cover member 60, and the elastic member 70 therein. In this embodiment, the stator accommodating portion 35 is cylindrical and extends in the axial direction. An end portion on one axial side (+Y side) of the stator accommodating portion 35 is an end portion on one axial side of the housing body 31, and is an opening portion 35a that opens to one axial side. In other words, the stator accommodating portion 35 has an opening portion 35a that opens to one axial side. The opening portion 35a is circular and centered on the central axis J. The opening portion 35a is closed by the cover member 33.

[0020] The pump accommodating portion 36 is connected to the other axial side (-Y side) of the stator accommodating portion 35. The pump accommodating portion 36 accommodates the pump mechanism 20 therein. The pump accommodating portion 36 opens to the other axial side. The opening of the pump accommodating portion 36 on the other axial side is closed by the pump cover 34.

[0021] The board accommodating portion 37 is located radially outside the stator accommodating portion 35. In this embodiment, the board accommodating portion 37 is located above the stator accommodating portion 35 and the pump accommodating portion 36. The board accommodating portion 37 extends in the axial direction. An end portion on the other axial side (-Y side) of the board accommodating portion 37 protrudes further toward the other axial side than the pump accommodating portion 36 and the pump cover 34. A connector portion 90 is provided at an end portion on the other axial side of the board accommodating portion 37. As shown in FIG. 2, the board accommodating portion 37 is in the shape of a substantially rectangular box that opens upward. The upper opening of the board accommodating portion 37 is closed by the board cover 32.

[0022] The substrate accommodating portion 37 accommodates a substrate 80 therein. The substrate 80 has a substrate main body 81 whose plate surface faces the vertical direction Z, and a plurality of electronic components 82 attached to the substrate main body 81. The electronic components 82 include, for example, transistors that configure an inverter circuit that supplies power to the stator 42. The substrate 80 is electrically connected to the coil 42c.

[0023] The substrate accommodating portion 37 has a plurality of first fixed portions 37a. In this embodiment, the first fixed portions 37a are cylindrical and extend upward from the bottom of the lower side of the substrate accommodating portion 37. The first fixed portions 37a are provided on the outer edge of the substrate accommodating portion 37 as viewed in the vertical direction Z. The first fixed portions 37a have female threaded holes 37c recessed downward from the upper surface of the first fixed portions 37a. The substrate 80 is fixed to the first fixed portions 37a. More specifically, the outer edge of the substrate main body 81 is fixed to the first fixed portions 37a by screws fastened to the female threaded holes 37c. As shown in FIG. 3, the plurality of first fixed portions 37a include a pair of first fixed portions 37a arranged to sandwich the connection hole 31b in the width direction X as viewed in the vertical direction Z.

[0024] The substrate accommodating portion 37 has a second fixed portion 37b. In this embodiment, the second fixed portion 37b is an end portion on one axial side (+Y side) of a quadrangular columnar portion 37e extending upward from the bottom of the lower side of the substrate accommodating portion 37. The upper surface of the second fixed portion 37b is recessed downward from the upper surface of a portion of the columnar portion 37e located on the other axial side (-Y side) of the second fixed portion 37b. The second fixed portion 37b has a female screw hole 37d recessed downward from the upper surface of the second fixed portion 37b.

[0025] The second fixed portion 37b is provided on one axial side (+Y side) inside the substrate accommodating portion 37. In this embodiment, the second fixed portions 37b are provided as a pair spaced apart in the width direction X. As shown in Fig. 3, a fixing member 53 (described later) is fixed to the second fixed portion 37b.

[0026] 1, the housing body 31 has a hole 31a that axially connects the interior of the stator accommodating portion 35 and the interior of the pump accommodating portion 36. An oil seal 44 that seals between the inner circumferential surface of the hole 31a and the outer circumferential surface of the shaft 41a is held in the hole 31a. A bearing 43b is held on one axial side (+Y side) of the oil seal 44 in the hole 31a.

[0027] The housing body 31 has a connection hole 31b that radially connects the inside of the stator accommodating portion 35 and the inside of the board accommodating portion 37. That is, the housing 30 has the connection hole 31b. The connection hole 31b is provided in a portion on one axial side (+Y side) of the housing body 31. In this embodiment, the connection hole 31b penetrates a wall between the inside of the stator accommodating portion 35 and the inside of the board accommodating portion 37 in the vertical direction Z. The upper end of the connection hole 31b opens at the end on one axial side inside the board accommodating portion 37. The connection hole 31b is located above the coil end 42g. The connection hole 31b overlaps with the end on one axial side of the stator core 42a as seen in the vertical direction Z. As shown in FIG. 3, the end on one axial side of the stator core 42a is exposed in the connection hole 31b. More specifically, the upper end of the outer circumferential surface at the end on one axial side of the core back 42d is exposed in the connection hole 31b.

[0028] The lid member 33 closes the opening 35a. As shown in FIG. 2, the lid member 33 has a lid main body 33a, a bearing holding cylinder 33b, and a plurality of fixing portions 33c. The lid main body 33a is a portion that closes the opening 35a from one axial side (+Y side). The outer shape of the lid main body 33a as viewed in the axial direction is a circle centered on the central axis J. The lid main body 33a has a hole 33d in the radial center that penetrates the lid main body 33a in the axial direction. A breather 91 is attached to the hole 33d.

[0029] The fixing portions 33c protrude radially outward from the lid body portion 33a. The fixing portions 33c are fixed to a surface on one axial side of the stator housing portion 35 by screws. The fixing portions 33c are arranged at equal intervals around the circumference. For example, four fixing portions 33c are provided.

[0030] The bearing holding tubular portion 33b is tubular and extends from the cover body portion 33a to the other axial side. The bearing holding tubular portion 33b is cylindrical and centered on the central axis J. As shown in FIG. 1, the bearing holding tubular portion 33b opens to the other axial side (-Y side). The bearing 43a is fitted to the radially inner side of the end of the bearing holding tubular portion 33b on the other axial side. Thus, the bearing holding tubular portion 33b holds the bearing 43a. The inside of the bearing holding tubular portion 33b is connected to the inside of the hole portion 33d. The end of the bearing holding tubular portion 33b on the other axial side overlaps with the connection hole 31b when viewed in the vertical direction Z. The end of the bearing holding tubular portion 33b on the other axial side is located radially inner of the connection hole 31b. The bearing holding tubular portion 33b is located radially inner of a tubular portion 61 of the cover member 60, which will be described later.

[0031] The busbar assembly 50 is passed through the connection hole 31b in the radial direction. In this embodiment, the busbar assembly 50 is passed through the connection hole 31b in the vertical direction Z. The busbar assembly 50 is passed through the connection hole 31b from above via an upper opening of the board accommodating portion 37. An upper portion of the busbar assembly 50, i.e., a radially outer portion, is located in the connection hole 31b. A lower portion of the busbar assembly 50, i.e., a radially inner portion, is located in the stator accommodating portion 35. The dimension of the lower portion of the busbar assembly 50 in the width direction X is smaller than the dimension of the connection hole 31b in the width direction X. The dimension of the lower portion of the busbar assembly 50 in the axial direction is smaller than the dimension of the connection hole 31b in the axial direction. The lower portion of the busbar assembly 50 is located on one axial side (+Y side) of the stator 42. That is, the busbar assembly 50 is located on one axial side of the stator 42 in the stator accommodating portion 35. The bus bar assembly 50 includes a bus bar holder 51 , a bus bar 52 , and a fixing member 53 .

[0032] The busbar holder 51 is a member that holds the busbar 52. The busbar holder 51 is made of resin. In this embodiment, the busbar holder 51 is an insert molded member that is made by insert molding using the busbar 52 and the fixing member 53 as insert members. As shown in FIG. 4, the busbar holder 51 has a base 54, a pair of legs 55a, 55b, a protrusion 56, and an abutment portion 57. In other words, the busbar assembly 50 has the protrusion 56. The base 54 is an upper portion of the busbar holder 51. The outer shape of the base 54 as viewed in the axial direction is a substantially rectangular shape that is long in the width direction X. The base 54 is located above the stator 42, that is, on the radially outer side.

[0033] The pair of legs 55a, 55b extend downward from the base 54. The pair of legs 55a, 55b are symmetrical in the width direction X. The leg 55a extends downward from the end of the base 54 on the other side (-X side) in the width direction. The leg 55a has a first extension 55c extending straight downward from the base 54, and a second extension 55d extending downward and obliquely to the other side in the width direction from the lower end of the first extension 55c. The leg 55b extends downward from the end of the base 54 on one side (+X side) in the width direction. The leg 55b has a first extension 55e extending straight downward from the base 54, and a second extension 55f extending downward and obliquely to one side in the width direction from the lower end of the first extension 55e. The second extending portion 55d and the second extending portion 55f become increasingly spaced apart from each other in the width direction X as they go downward. The pair of legs 55a, 55b overlap with an upper portion of the stator 42 when viewed in the axial direction.

[0034] The protrusions 56 are provided on the pair of legs 55a, 55b, respectively. The pair of protrusions 56 protrude from each of the pair of legs 55a, 55b toward one axial side (+Y side). In this embodiment, the pair of protrusions 56 are provided on the second extending portions 55d, 55f of the pair of legs 55a, 55b, respectively. The pair of protrusions 56 are cylindrical and extend in the axial direction.

[0035] The pair of protrusions 56 are heat-welded to the cover member 60. Although heat welding is exemplified here, heat welding, ultrasonic welding, and the like, which are generally called welding, can be used. That is, the pair of protrusions 56 may be welded to the cover member 60 in any manner. FIG. 4 shows the protrusions 56 before being heat-welded. FIG. 5 shows the protrusions 56 provided on the leg 55b in a heat-welded state, and the protrusions 56 provided on the leg 55a in a state before being heat-welded. As shown in FIG. 5, the protrusions 56 have a large diameter portion 56a, a small diameter portion 56b, and a heat-deformed portion 56c.

[0036] The large diameter portion 56a is connected to the leg portions 55a and 55b. The small diameter portion 56b is connected to one axial side (+Y side) of the large diameter portion 56a. The outer diameter of the small diameter portion 56b is smaller than that of the large diameter portion 56a. The axial dimension of the small diameter portion 56b is larger than that of the large diameter portion 56a. The thermally deformed portion 56c is connected to one axial side of the small diameter portion 56b. The thermally deformed portion 56c is, for example, a hemispherical shape that is convex toward one axial side. The thermally deformed portion 56c is a portion that is deformed by heat when the end portion of one axial side of the small diameter portion 56b before being thermally welded is thermally welded. The outer diameter of the thermally deformed portion 56c is, for example, larger than the outer diameter of the large diameter portion 56a.

[0037] As shown in FIG. 6, the abutting portion 57 protrudes from the lower end of the base 54 toward the other axial side (-Y side). The abutting portion 57 is a plate-like portion arranged along the circumferential direction. The abutting portion 57 has an abutting body portion 57a ​​protruding from the base 54 toward the other axial side, and a pair of abutting protrusions 57b protruding from the abutting body portion 57a ​​toward the other axial side. The abutting body portion 57a ​​has a circumferential center portion 57c and a pair of circumferential side portions 57d. The circumferential center portion 57c is the circumferential center portion of the abutting body portion 57a. The circumferential center portion 57c is a plate-like portion whose plate surface is perpendicular to the vertical direction Z. The pair of circumferential side portions 57d extend from the circumferential center portion 57c to both sides in the circumferential direction. The circumferential side portions 57d are located below the circumferential center portion 57c, that is, radially inward. The circumferential side portion 57d is connected to the circumferential central portion 57c via a step. The circumferential dimension of the circumferential side portion 57d is smaller than the circumferential dimension of the circumferential central portion 57c.

[0038] In this embodiment, the pair of abutting protrusions 57b protrude from each of the pair of circumferential side portions 57d toward the other axial side (-Y side). As shown in Fig. 3, the abutting protrusions 57b abut against the stator core 42a from one axial side (+Y side). More specifically, the abutting protrusions 57b abut against an upper end portion exposed to the connection hole 31b among the ends on one axial side of the core back 42d. As a result, in this embodiment, the busbar assembly 50 contacts the stator 42 from one axial side.

[0039] As shown in FIG. 4, a portion of busbar 52 is embedded in busbar holder 51. A plurality of busbars 52 are provided. In this embodiment, three busbars 52 are provided, namely, busbar 52A, busbar 52B, and busbar 52C. The three busbars 52A, 52B, and 52C are arranged side by side in the width direction X. Busbar 52A and busbar 52B are arranged to sandwich busbar 52C in the width direction X. Busbar 52A is located on the other width direction side (-X side) of busbar 52C. Busbar 52B is located on one width direction side (+X side) of busbar 52C. Busbar 52A and busbar 52C are symmetrical in shape in the width direction X.

[0040] The busbar 52A has a busbar main body 52Am, a coil connection portion 52Ae, and a board connection portion 52Af. The busbar main body 52Am connects the coil connection portion 52Ae and the board connection portion 52Af. The busbar main body 52Am extends in the vertical direction Z as a whole. The busbar main body 52Am has a first portion 52Aa, a second portion 52Ab, a third portion 52Ac, and a fourth portion 52Ad.

[0041] The first portion 52Aa extends in the vertical direction Z. The first portion 52Aa is embedded and held between the base portion 54 and the first extending portion 55c. An upper end of the first portion 52Aa protrudes upward from the base portion 54 and is exposed to the outside of the bus bar holder 51. The second portion 52Ab extends from an upper end of the first portion 52Aa to the other axial side (-Y side). The third portion 52Ac extends downward from a lower end of the first portion 52Aa and obliquely to the other width direction side (-X side). The third portion 52Ac is embedded and held in the second extending portion 55d. The fourth portion 52Ad extends downward from a lower end of the third portion 52Ac. The fourth portion 52Ad protrudes downward from the leg portion 55a and is exposed to the outside of the bus bar holder 51. The plate surfaces of the first portion 52Aa, the third portion 52Ac, and the fourth portion 52Ad are oriented in the axial direction. The plate surface of the second portion 52Ab is oriented in the vertical direction Z.

[0042] The coil connection portion 52Ae is connected to a lower end of the fourth portion 52Ad. The coil connection portion 52Ae is located on one axial side (+Y side) of the stator 42 in the stator accommodating portion 35. The coil connection portion 52Ae overlaps with the opening 35a when viewed from the one axial side (+Y side). The coil connection portion 52Ae protrudes further toward the one axial side than the busbar main body portion 52Am. The plate surface of the coil connection portion 52Ae is along the axial direction. In this embodiment, the coil connection portion 52Ae is U-shaped when viewed in the axial direction, sandwiching the lead wire 42f drawn from the coil 42c to the one axial side. The coil connection portion 52Ae is U-shaped when viewed in the axial direction, opening upward. That is, the busbar 52A is a busbar 52 in which the coil connection portion 52Ae opens upward in the vertical direction Z.

[0043] In this specification, "a certain object is U-shaped" includes not only cases where the certain object is strictly U-shaped, but also cases where the certain object is approximately U-shaped. "Approximately U-shaped" includes a shape in which the two opposing sides are different in length, and a shape in which the two opposing sides are inclined toward each other. "A certain object is U-shaped" may mean a shape in which one ends of the two sides are connected to each other and the other ends of the two sides face each other with a gap between them.

[0044] The coil connection portion 52Ae has a first clamping portion 52g connected to the busbar main body portion 52Am and a second clamping portion 52h that clamps the lead wire 42f between the first clamping portion 52g and the second clamping portion 52h. The first clamping portion 52g and the second clamping portion 52h extend at a slight incline with respect to the vertical direction Z. The second clamping portion 52h is located radially inside the first clamping portion 52g. The lower end of the first clamping portion 52g and the lower end of the second clamping portion 52h are connected to each other. In this embodiment, the coil connection portion 52Ae holds two lead wires 42f. The lead wires 42f are fixed to the coil connection portion 52Ae by, for example, welding. As a result, the coil connection portion 52Ae is electrically connected to the coil 42c in the stator accommodating portion 35.

[0045] The board connection portion 52Af extends upward from an end portion on the other axial side (-Y side) of the second portion 52Ab. In this embodiment, the board connection portion 52Af has an elongated rectangular prism shape. As shown in FIG. 1, the board connection portion 52Af is located inside the board accommodating portion 37. The board connection portion 52Af is inserted from below into a through hole 81a provided in the board main body 81. The board connection portion 52Af is fixed to the board main body 81 by, for example, soldering. As a result, the board connection portion 52Af is electrically connected to the board 80 inside the board accommodating portion 37. Therefore, the bus bar 52A electrically connects the coil 42c and the board 80.

[0046] 4, busbar 52B has a similar configuration to busbar 52A, except that busbar 52B is provided across base portion 54 and leg portions 55b, and has a shape symmetrical to busbar 52A in the width direction X. Busbar 52B has busbar main body 52Bm, coil connection portion 52Be, and board connection portion 52Bf. Busbar main body 52Bm has first portion 52Ba, second portion 52Bb, third portion 52Bc, and fourth portion 52Bd. Each portion of busbar 52B has a shape and arrangement symmetrical to each portion having a similar name in busbar 52A in the width direction X.

[0047] The busbar 52C has a busbar main body 52Cm, a coil connection portion 52Ce, and a board connection portion 52Cf. The busbar main body 52Cm has a first portion 52Ca and a second portion 52Cb. The first portion 52Ca extends in the vertical direction Z. The first portion 52Ca is held by a portion of the base 54 located between the pair of legs 55a, 55b in the width direction X. Both ends of the first portion 52Ca in the vertical direction Z protrude from the base 54 in the vertical direction Z. A part of the first portion 52Ca held by the base 54 is bent to one side in the width direction (+X side). The second portion 52Cb extends from an upper end of the first portion 52Ca to the other axial side (-Y side). The board connection portion 52Cf extends upward from an end of the second portion 52Cb on the other axial side. The board connection portions 52Af, Bf, Cf of the bus bars 52A, 52B, 52C are arranged side by side in the width direction X at intervals.

[0048] The coil connection portion 52Ce is connected to a lower end of the first portion 52Ca. In this embodiment, the coil connection portion 52Ce is U-shaped and opens to one widthwise side (+X side) when viewed in the axial direction. The coil connection portion 52Ce has a first clamping portion 52i connected to the busbar main body portion 52Cm and a second clamping portion 52j that clamps the lead wire 42f between the first clamping portion 52i and the second clamping portion 52j. The first clamping portion 52i and the second clamping portion 52j extend substantially in the widthwise direction X. The first clamping portion 52i and the second clamping portion 52j are disposed opposite to each other in the vertical direction Z. The second clamping portion 52j is located radially inward, i.e., below the first clamping portion 52i. An end portion of the first clamping portion 52i on the other widthwise side (-X side) and an end portion of the second clamping portion 52j on the other widthwise side are connected to each other. The other configurations of the coil connection portion 52Ce are similar to the other configurations of the coil connection portions 52Ae and 52Be.

[0049] The fixing member 53 is partially embedded in the busbar holder 51 and held by the busbar holder 51. In this embodiment, the fixing member 53 is a metal plate-shaped member. The fixing member 53 is located on the other axial side (-Y side) of the multiple busbars 52A, 52B, and 52C. As shown in FIG. 6, the fixing member 53 has a connecting portion 53g and a pair of arm portions 53a and 53b. The connecting portion 53g extends in the width direction X. The plate surface of the connecting portion 53g faces the axial direction. The connecting portion 53g is held by the base portion 54. Both ends of the connecting portion 53g in the width direction X protrude in the width direction X beyond the base portion 54. The connecting portion 53g is located on the other axial side of the first portions 52Aa, 52Ba, and 52Ca. Three upper convex portions 53h protruding upward and three lower convex portions 53i protruding downward are provided in a portion of connecting portion 53g embedded in base portion 54. Each of upper convex portions 53h and each of lower convex portions 53i are disposed at a position overlapping with each of bus bars 52A, 52B, and 52C when viewed in the axial direction.

[0050] The pair of arms 53a, 53b are connected to both ends of the connecting portion 53g in the width direction X. The arm 53a has a first extension 53c extending upward from an end of the connecting portion 53g on the other width direction side (-X side), and a second extension 53d extending from an upper end of the first extension 53c to the other axial direction side (-Y side). The arm 53b has a first extension 53e extending upward from an end of the connecting portion 53g on one width direction side (+X side), and a second extension 53f extending from an upper end of the first extension 53e to the other axial direction side. The plate surfaces of the first extensions 53c, 53e face the axial direction. The plate surfaces of the second extensions 53d, 53f face the vertical direction Z. The second extending portions 53d, 53f are located below the second portions 52Ab, 52Bb, 52Cb. A through hole 53k is provided at the other axial end of each of the second extending portions 53d, 53f, penetrating the second extending portions 53d, 53f in the axial direction.

[0051] As shown in FIG. 3, the pair of arms 53a, 53b are located inside the board accommodating portion 37. The pair of arms 53a, 53b are fixed to the pair of second fixed portions 37b by screws 92, respectively. More specifically, the second extensions 53d, 53f are fixed to the second fixed portions 37b by screws 92 that are inserted from above into through holes 53k provided in the second extensions 53d, 53f and fastened to the female threaded holes 37d. That is, in this embodiment, the fixing member 53 is fixed to the second fixed portions 37b by screws 92 that are fastened from the radially outer side. As a result, the fixing member 53 is fixed to the housing 30.

[0052] As shown in FIG. 1, the cover member 60 sandwiches a lower portion of the busbar assembly 50 between itself and the stator 42 in the axial direction within the stator accommodating portion 35. As shown in FIG. 2, the cover member 60 is a cylindrical member centered on the central axis J and opening to the other axial side (-Y side). The cover member 60 is inserted into the opening 35a from one axial side (+Y side) and accommodated within the stator accommodating portion 35. The cover member 60 is made of resin. As shown in FIG. 7, the cover member 60 has a tubular portion 61, an opposing portion 62, and a claw portion 64.

[0053] The tubular portion 61 is cylindrical and extends in the axial direction and opens to the other axial side (-Y side). The tubular portion 61 has a through portion 61a. The through portion 61a penetrates the wall of the tubular portion 61 in the radial direction. In this embodiment, the through portion 61a penetrates the upper wall of the tubular portion 61 in the vertical direction Z. As shown in FIG. 6, the bus bar holder 51 is passed through the through portion 61a in the vertical direction Z. This causes the bus bar assembly 50 to be hooked in the circumferential direction on both circumferential edges of the through portion 61a. Therefore, the cover member 60 is prevented from rotating in the circumferential direction relative to the bus bar assembly 50. A pair of legs 55a, 55b and the coil connection portions 52Ae, 52Be, and 52Ce are located on the radially inner side of the tubular portion 61.

[0054] As shown in FIG. 1, the cylindrical portion 61 is fitted to the inner peripheral surface of the stator accommodating portion 35. An end portion on the other axial side (-Y side) of the cylindrical portion 61 is located radially outside an end portion on one axial side (+Y side) of the stator 42. As a result, the cylindrical portion 61 surrounds the end portion on one axial side of the stator 42. In this embodiment, the cylindrical portion 61 surrounds a portion of the insulator 42b that protrudes further toward the one axial side than the stator core 42a, and the coil end 42g. An end portion on the other axial side of the cylindrical portion 61 faces the one axial side of the stator core 42a via a gap. In this embodiment, an end portion on the other axial side of the cylindrical portion 61 faces the one axial side of the core back 42d via a gap.

[0055] As shown in FIG. 7, the cylindrical portion 61 has a slit 61b and an elastically deforming portion 63. The slit 61b is provided in a portion of the cylindrical portion 61 on the other axial side (-Y side). The slit 61b penetrates the wall of the cylindrical portion 61 in the radial direction and opens to the other axial side. The elastically deforming portion 63 extends from an edge of the inner edge of the slit 61b on one axial side (+Y side) to the other axial side. The elastically deforming portion 63 is a portion that can elastically deform in the radial direction with the edge of the slit 61b as a fulcrum. The axial position of the elastically deforming portion 63 at the end on the other axial side is the same as the axial position of the end on the other axial side of the portion of the cylindrical portion 61 where the slit 61b is not provided.

[0056] The portion of the radially outer surface of the elastically deforming portion 63 on the other axial side (-Y side) is an inclined surface 63a located radially inward as it approaches the other axial side. Before the cylindrical portion 61 is disposed in the stator accommodating portion 35, the end of the inclined surface 63a on the other axial side is located radially inward from the inner edge of the opening 35a. Before the cylindrical portion 61 is disposed in the stator accommodating portion 35, the end of the inclined surface 63a on one axial side is located radially outward from the inner edge of the opening 35a. When the cylindrical portion 61 is inserted into the stator accommodating portion 35 from the opening 35a, the inclined surface 63a is pressed radially inward by the inner peripheral surface of the stator accommodating portion 35. As a result, the elastically deforming portion 63 is elastically deformed radially inward and is pressed against the inner peripheral surface of the stator accommodating portion 35 from the radially inner side. As shown in FIG. 6, a plurality of elastically deforming portions 63 are provided at intervals in the circumferential direction. In this embodiment, three elastic deformation portions 63 are provided at equal intervals around the circumference.

[0057] 1, 5, and 6, the facing portion 62 is located on one axial side (+Y side) of the busbar assembly 50 within the stator accommodating portion 35. The facing portion 62 is annular and surrounds the central axis J. A radial outer edge portion of the facing portion 62 is connected to an inner circumferential surface of the axial one side portion of the cylindrical portion 61. The facing portion 62 is located on the other axial side (-Y side) of the end portion of the cylindrical portion 61 on the axial one side.

[0058] As shown in FIG. 7, the opposing portion 62 has an annular base portion 62a surrounding the central axis J, and a support portion 62b protruding from the base portion 62a to one axial side (+Y side). The support portion 62b extends in the circumferential direction. A plurality of the support portions 62b are provided at intervals in the circumferential direction. In this embodiment, three support portions 62b are provided at equal intervals around one circumference along the circumferential direction. The radially outer end of the support portion 62b is connected to the inner peripheral surface of the cylindrical portion 61. A protrusion 65 protruding to one axial side is provided at the circumferential center of the radially outer edge portion of each support portion 62b.

[0059] As shown in FIG. 5, the opposing portion 62 has a hole portion 62c penetrating the opposing portion 62 in the axial direction. In this embodiment, the hole portion 62c corresponds to a "radial positioning portion." The hole portion 62c penetrates the base portion 62a in the axial direction. In this embodiment, the hole portion 62c is provided in a plurality of locations spaced apart from each other in the circumferential direction. The hole portion 62c is provided in a pair spaced apart from each other in the width direction X. The pair of hole portions 62c is located above the central axis J. One of the pair of hole portions 62c is located on one width direction side (+X side) of the central axis J, and the other is located on the other width direction side (-X side) of the central axis J.

[0060] A pair of protrusions 56 are inserted into the pair of holes 62c from the other axial side (-Y side). As a result, the holes 62c, which are radial positioning portions, position the busbar assembly 50 in the radial direction. The small diameter portion 56b is inserted into the inside of the holes 62c. The thermally deformed portion 56c is located on one axial side (+Y side) of the holes 62c. The thermally deformed portion 56c is heat welded to a surface on one axial side of the base portion 62a. As a result, the busbar holder 51 and the cover member 60 are fixed to each other.

[0061] The peripheral portion of the hole portion 62c on the surface on the other axial side (-Y side) of the opposing portion 62 is an axial positioning portion 62d. In other words, the opposing portion 62 has the axial positioning portion 62d. The axial positioning portion 62d contacts the busbar assembly 50 from one axial side (+Y side). More specifically, the axial positioning portion 62d contacts the large diameter portion 56a from one axial side. In this way, the axial positioning portion 62d positions the busbar assembly 50 in the axial direction.

[0062] The claw portion 64 has a root portion 64a protruding from the support portion 62b toward one axial side (+Y side) and a claw body portion 64b protruding radially outward from an end portion on one axial side of the root portion 64a. The claw portion 64 is provided on each support portion 62b. That is, in this embodiment, three claw portions 64 are provided. Each claw portion 64 is provided at the circumferential center of the radially inner edge portion of each support portion 62b.

[0063] As shown in FIG. 6, the cover member 60 has inner peripheral wall portions 66, 67. The inner peripheral wall portions 66, 67 protrude from the radial inner edge of the opposing portion 62 toward the other axial side (-Y side). The inner peripheral wall portion 66 extends in the circumferential direction and surrounds the central axis J. When viewed in the axial direction, the inner peripheral wall portion 66 has a C-shape that opens upward. The inner peripheral wall portion 67 is provided at an upper end of the radial inner edge of the opposing portion 62. The inner peripheral wall portion 67 is disposed circumferentially away from each of the circumferential end portions of the inner peripheral wall portion 66. When viewed in the axial direction, the inner peripheral wall portion 67 has an arc shape that is convex upward and centered on the central axis J.

[0064] The other axial end portions of the inner peripheral wall portions 66, 67 are located on one axial side (+Y side) of the other axial end portion of the cylindrical portion 61. The pair of legs 55a, 55b and the coil connection portions 52Ae, 52Be are located radially between the inner peripheral wall portion 66 and the cylindrical portion 61. The coil connection portion 52Ce is located radially between the inner peripheral wall portion 67 and the main body portion 57a ​​of the abutment portion 57. As shown in FIG. 1, the bearing retaining cylindrical portion 33b is located radially inside the inner peripheral wall portions 66, 67.

[0065] The elastic member 70 is located axially between the lid member 33 and the cover member 60. More specifically, the elastic member 70 is located axially between the lid main body portion 33a and the opposing portion 62. As shown in FIG. 7, in this embodiment, the elastic member 70 is attached to the cover member 60. More specifically, the elastic member 70 is held on a surface on one axial side (+Y side) of the opposing portion 62. In this embodiment, the elastic member 70 is plate-shaped with a plate surface facing the axial direction. The elastic member 70 has a held portion 71 and a contact portion 72.

[0066] The held portion 71 is a portion held on one axial side (+Y side) of the opposing portion 62. The held portion 71 is annular and surrounds the central axis J. The held portion 71 is fitted into the cylindrical portion 61 on one axial side of the opposing portion 62. The held portion 71 is supported from the other axial side (-Y side) by a plurality of support portions 62b. The held portion 71 has a protruding portion 71a that protrudes radially inward. A plurality of protruding portions 71a are provided at intervals in the circumferential direction. In this embodiment, three protruding portions 71a are provided at equal intervals around one circumference along the circumferential direction. Each protruding portion 71a is located on one axial side of each support portion 62b. The radial inner edge of the protruding portion 71a is located on the other axial side of the claw main body portion 64b. As a result, the claw portion 64 is hooked on the held portion 71 from one axial side.

[0067] The held portion 71 has a recess 71b recessed radially inward at its radially outer edge. A plurality of recesses 71b are provided at intervals in the circumferential direction. In this embodiment, three recesses 71b are provided at equal intervals around the circumference in the circumferential direction. Each protrusion 65 is located inside each recess 71b. This positions the elastic member 70 in the circumferential direction. The held portion 71 has a through hole 71c penetrating the held portion 71 in the axial direction. Two through holes 71c are provided at intervals in the circumferential direction for each protrusion 71a.

[0068] The contact portion 72 is connected to the held portion 71. The contact portion 72 is a leaf spring. In this embodiment, the contact portion 72 extends from each of the protruding portions 71a toward one circumferential side (+θ side). That is, in this embodiment, three contact portions 72 are provided. The portion on the one circumferential side of the contact portion 72 is located on one axial side (+Y side) of the held portion 71. As shown in FIG. 1, the contact portion 72 is in contact with a surface on the other axial side (-Y side) of the lid main body portion 33a. As a result, the contact portion 72 is in contact with the lid member 33 from the other axial side. The contact portion 72 is in a state of being elastically deformed toward the other axial side. As a result, the elastic member 70 applies a force toward the other axial side (-Y direction) to the cover member 60.

[0069] The pump mechanism 20 is accommodated in the pump accommodation portion 36. The pump mechanism 20 has an inner rotor 21 and an outer rotor 22. The inner rotor 21 is connected to a portion of the shaft 41a that protrudes into the pump accommodation portion 36. This connects the pump mechanism 20 to the rotor 41. The outer rotor 22 is annular and surrounds the inner rotor 21. The inner rotor 21 and the outer rotor 22 mesh with each other. When the inner rotor 21 is rotated by the shaft 41a, the outer rotor 22 also rotates.

[0070] A worker assembling the rotating electric machine 10 of this embodiment inserts and positions the stator 42 in the stator accommodating portion 35 through the opening 35a, and then inserts the busbar assembly 50 from above into the connection hole 31b through the upper opening of the board accommodating portion 37. The worker fixes the fixing member 53 of the busbar assembly 50 to the second fixed portion 37b with the screw 92 through the upper opening of the board accommodating portion 37. Next, the worker welds and fixes the lead wires 42f to the coil connection portions 52Ae, 52Be, 52Ce of the busbar assembly 50 through the opening 35a.

[0071] Next, the worker or the like fits the cover member 60 into the stator accommodating portion 35 through the opening 35a. At this time, the worker or the like passes the pair of protrusions 56 of the busbar assembly 50 through the pair of holes 62c provided in the facing portion 62. The worker or the like pushes the cover member 60 into the stator accommodating portion 35, for example, until the convex portion 57b of the abutting portion 57 abuts against the stator core 42a from one axial side (+Y side) and the axial positioning portion 62d of the cover member 60 comes into contact with the large diameter portion 56a of the protrusion 56 from one axial side.

[0072] The worker applies heat to the portion of the protrusion 56 protruding from the hole 62c toward one axial side (+Y side), and thermally welds the protrusion 56 to the facing portion 62. As a result, a part of the small diameter portion 56b of the protrusion 56 is deformed by heat, and a thermally deformed portion 56c is created. Next, the worker inserts the elastic member 70 into the stator accommodating portion 35 from the opening 35a, and holds the elastic member 70 on one axial side of the facing portion 62 of the cover member 60. Next, the worker accommodates the rotor 41 inside the stator accommodating portion 35 through the opening 35a. After accommodating the rotor 41, the worker fixes the cover member 33 to the stator accommodating portion 35 to close the opening 35a.

[0073] When the lid member 33 is fixed, the contact portion 72 of the elastic member 70 elastically deforms, and the cover member 60 is pressed toward the other axial side (-Y side) by the elastic member 70. This maintains a state in which the convex portion 57b of the abutment portion 57 abuts against the stator core 42a from one axial side (+Y side), and the axial positioning portion 62d of the cover member 60 contacts the large diameter portion 56a of the protrusion 56 from one axial side. This prevents the busbar assembly 50 from moving in the axial direction.

[0074] When the busbar assembly 50 is fixed to the second fixed portion 37b with the screws 92, if the abutting portion 57 does not abut against the stator core 42a in the axial direction, the cover member 60 presses the busbar assembly 50 toward the other axial side (-Y side), causing the abutting portion 57 of the busbar assembly 50 to abut against the stator core 42a. At this time, the position of the busbar assembly 50 is slightly displaced from the position where it is fixed to the second fixed portion 37b by the screws 92, but this displacement is absorbed by the elastic deformation of the fixing member 53. The elastic deformation of the fixing member 53 generates an elastic force in one axial direction (+Y direction), but this elastic force is sufficiently smaller than the elastic force in the other axial direction (-Y direction) applied to the cover member 60 by the elastic member 70. Therefore, even if the fixing member 53 elastically deforms and an elastic force is applied to the cover member 60 in one axial direction, the cover member 60 is prevented from moving to one axial direction against the elastic force of the elastic member 70. This prevents the axial position of the cover member 60 and the axial position of the busbar assembly 50 from shifting.

[0075] Next, the worker fixes the board 80 in the board accommodating portion 37. At this time, the worker passes each of the board connection parts 52Af, 52Bf, and 52Cf through each of the through holes 81a of the board 80. The worker fixes each of the board connection parts 52Af, 52Bf, and 52Cf onto the board 80 by soldering. After connecting each of the board connection parts 52Af, 52Bf, and 52Cf to the board 80, the worker fixes the board cover 32 to the upper side of the board accommodating portion 37 to close the upper opening of the board accommodating portion 37.

[0076] In this specification, the term "workers, etc." includes workers who perform each task and assembly equipment, etc. Each task may be performed by a worker alone, by an assembly equipment alone, or by both a worker and an assembly equipment.

[0077] According to this embodiment, the housing 30 has a connection hole 31b that radially connects the inside of the stator accommodating portion 35 and the inside of the board accommodating portion 37. A busbar assembly 50 having a busbar 52 is passed through the connection hole 31b in the radial direction. The busbar 52 has coil connection parts 52Ae, 52Be, and 52Ce that are electrically connected to the coil 42c in the stator accommodating portion 35, and board connection parts 52Af, 52Bf, and 52Cf that are electrically connected to the board 80 in the board accommodating portion 37. Thus, in this embodiment, the busbar assembly 50 having the busbar 52 that is connected to the coil 42c and the board 80 is passed through the connection hole 31b. That is, it is not necessary to electrically connect the coil 42c and the board 80 by connecting a plurality of busbar members with screws or the like. Therefore, since it is not necessary to configure one busbar 52 with a plurality of busbar members, the number of parts of the rotating electric machine 10 can be reduced. In addition, the number of parts of the pump 100 can be reduced. Therefore, the number of steps for assembling the rotary electric machine 10 and the number of steps for assembling the pump 100 can be reduced.

[0078] Also, for example, when a bus bar is configured to connect coil 42c and substrate 80 by connecting multiple bus bar members together with screws, a bus bar member arranged in stator accommodating portion 35 from opening 35a is connected to a bus bar member arranged in substrate accommodating portion 37 from an upper opening of substrate accommodating portion 37. In this case, the positions of the two bus bar members are easily misaligned, and it may be difficult to fix the bus bar members together by screwing or the like. In contrast, according to the present embodiment, it is not necessary to fix the bus bar members together by screwing or the like. Therefore, the assembly workability of rotating electric machine 10 can be improved. Also, the assembly workability of pump 100 can be improved.

[0079] According to the present embodiment, the busbar assembly 50 includes the fixing member 53 held by the busbar holder 51 and fixed to the housing 30. Therefore, the busbar assembly 50 can be easily fixed to the housing 30 with good positional accuracy. This allows the coil connection parts 52Ae, 52Be, 52Ce and the board connection parts 52Af, 52Bf, 52Cf of the busbar 52 to be easily positioned with good positional accuracy. This makes it easier to connect the coil 42c to the coil connection parts 52Ae, 52Be, 52Ce and to connect the board 80 to the board connection parts 52Af, 52Bf, 52Cf. Furthermore, since the fixing member 53 separate from the busbar 52 is fixed to the housing 30, the busbar 52 can be prevented from being deformed even when a force is applied to the busbar assembly 50. This makes it easier to maintain the connection state between the coil 42c and the board 80 by the busbar 52.

[0080] Furthermore, for example, when a busbar is configured by connecting a plurality of busbar members together with screws to connect coil 42c and substrate 80, the busbar members to be placed in stator accommodating portion 35 from opening 35a are held by a holder member that fits into stator accommodating portion 35. In this case, it is necessary to connect busbar members and lead wire 42f by passing lead wire 42f of coil 42c through a hole provided in the holder member. Therefore, there is a problem that the holder member gets in the way and makes it difficult to connect busbar members and lead wire 42f.

[0081] In contrast, according to the present embodiment, the busbar 52 is configured to be passed through the connection hole 31b together with the busbar assembly 50. Therefore, no holder member is provided to be fitted into the stator accommodating portion 35. As a result, after the busbar assembly 50 is inserted into the connection hole 31b, the connection work between the coil connection portions 52Ae, 52Be, and 52Ce and the lead wires 42f can be easily performed through the openings 35a. Therefore, the connection work between the coil connection portions 52Ae, 52Be, and 52Ce and the coils 42c can be easily performed.

[0082] According to the present embodiment, the coil connection parts 52Ae, 52Be, and 52Ce overlap with the opening 35a when viewed from one axial side, which makes it easier to connect the coil connection parts 52Ae, 52Be, and 52Ce to the lead wires 42f through the opening 35a.

[0083] According to the present embodiment, the rotating electric machine 10 includes a cover member 60 having a cylindrical portion 61 surrounding one axial end of the stator 42. Therefore, even if the busbar assembly 50 is inserted through the connection hole 31b, the cover member 60 can insulate the one axial end of the stator 42 from the housing 30. The cover member 60 also has a facing portion 62 located on one axial side of the busbar assembly 50 in the stator accommodating portion 35. The facing portion 62 has an axial positioning portion 62d that positions the busbar assembly 50 in the axial direction. Therefore, the cover member 60 can position the busbar assembly 50 in the axial direction. This allows the coil connection portions 52Ae, 52Be, 52Ce and the board connection portions 52Af, 52Bf, 52Cf of the busbar 52 to be easily positioned with high positional accuracy. This facilitates the connection of the coil 42c to the coil connection parts 52Ae, 52Be, 52Ce and the connection of the board 80 to the board connection parts 52Af, 52Bf, 52Cf. Furthermore, since the busbar assembly 50 can be positioned in the axial direction by utilizing the cover member 60 that provides insulation between the stator 42 and the housing 30, an increase in the number of parts of the rotating electric machine 10 can be suppressed compared to the case where a separate positioning member is provided.

[0084] According to the present embodiment, the rotating electric machine 10 includes an elastic member 70 that is located between the lid member 33 and the cover member 60 in the axial direction and applies a force to the cover member 60 in the other axial direction. Therefore, the elastic member 70 can hold the cover member 60 in the axial direction. This makes it possible to suppress the cover member 60 and the busbar assembly 50 from being displaced in the axial direction. Furthermore, by forming the elastic member 70 as a leaf spring as in the present embodiment, it is easy to increase the axial distance over which the elastic member 70 can be elastically deformed, and it is easy to reduce the degree of change in elastic force relative to a change in the amount of elastic deformation. As a result, even if the amount of elastic deformation of the elastic member 70 in the axial direction varies due to variation in the axial distance between the lid member 33 and the cover member 60, it is possible to suppress variation in the elastic force applied to the cover member 60 from the elastic member 70 to a relatively small value. Therefore, regardless of variation in the axial distance between the lid member 33 and the cover member 60, the elastic member 70 can easily hold the cover member 60 and the busbar assembly 50 in the axial direction.

[0085] According to the present embodiment, the coil connection parts 52Ae, 52Be, 52Ce are U-shaped when viewed in the axial direction, sandwiching the lead wire 42f drawn from the coil 42c. Therefore, the coil connection parts 52Ae, 52Be, 52Ce and the lead wire 42f can be connected to each other while the lead wire 42f is sandwiched and held by the coil connection parts 52Ae, 52Be, 52Ce. This makes it easier to connect the coil connection parts 52Ae, 52Be, 52Ce and the coil 42c.

[0086] According to the present embodiment, the coil connection portion 52Ae has a first clamping portion 52g connected to the busbar main body portion 52Am and a second clamping portion 52h that clamps the lead wire 42f between the first clamping portion 52g and the second clamping portion 52h. The second clamping portion 52h is located radially inside the first clamping portion 52g. Therefore, the opening of the U-shaped coil connection portion 52Ae is located radially inside. This allows the lead wire 42f drawn from the coil 42c to be hooked and clamped by the coil connection portion 52Ae from the radially inside. This makes it easy to hold the lead wire 42f in the coil connection portion 52Ae. This makes it easier to connect the coil connection portion 52Ae to the coil 42c. The same applies to the coil connection portions 52Be and 52Ce.

[0087] Furthermore, according to this embodiment, the multiple bus bars 52 include bus bars 52A, 52B in which the coil connection portions 52Ae, 52Be open upward in the vertical direction Z. Therefore, the lead wires 42f held by the coil connection portions 52Ae, 52Be can be easily maintained in the coil connection portions 52Ae, 52Be by utilizing gravity. This makes it easier to connect the coil connection portions 52Ae, 52Be to the coils 42c.

[0088] Furthermore, according to this embodiment, the board accommodating portion 37 has the second fixed portion 37b to which the fixing member 53 is fixed. Therefore, the busbar assembly 50 inserted into the connection hole 31b from the opening of the board accommodating portion 37 can be fixed to the second fixed portion 37b in the board accommodating portion 37 from the opening of the board accommodating portion 37. This makes it easier to fix the busbar assembly 50 to the housing 30.

[0089] Furthermore, according to this embodiment, the fixing member 53 is fixed to the second fixed portion 37b by the screw 92 fastened from the radially outer side. Therefore, the fixing member 53 can be more easily and firmly fixed to the housing 30 through the opening of the board accommodating portion 37.

[0090] Furthermore, according to this embodiment, the elastic member 70 has a held portion 71 held on one axial side of the opposing portion 62, and a contact portion 72 connected to the held portion 71 and contacting the cover member 33 from the other axial side. Therefore, the elastic member 70 can be held by the cover member 60. This makes it possible to prevent the position of the elastic member 70 from shifting within the stator accommodating portion 35. Therefore, the state in which the elastic force is applied to the cover member 60 by the elastic member 70 can be suitably maintained.

[0091] Furthermore, according to this embodiment, the cover member 60 has a claw portion 64 hooked on the held portion 71 from one axial side. Therefore, the claw portion 64 can suitably prevent the elastic member 70 from coming off the cover member 60 to one axial side. As a result, even when the rotor 41 is disposed in the stator accommodating portion 35 after the elastic member 70 is held by the cover member 60 in the stator accommodating portion 35, the elastic member 70 can be prevented from coming off the cover member 60 due to the magnetic force of the rotor magnet of the rotor 41. Therefore, the ease of assembly of the rotating electric machine 10 can be further improved.

[0092] Furthermore, according to this embodiment, the facing portion 62 has the hole portion 62c as a radial positioning portion for positioning the busbar assembly 50 in the radial direction. Therefore, the busbar assembly 50 can be positioned in the radial direction by the cover member 60. This allows the coil connection portions 52Ae, 52Be, 52Ce and the board connection portions 52Af, 52Bf, 52Cf of the busbar 52 to be positioned with higher positional accuracy. This makes it easier to connect the coil 42c to the coil connection portions 52Ae, 52Be, 52Ce and to connect the board 80 to the board connection portions 52Af, 52Bf, 52Cf.

[0093] According to the present embodiment, the radial positioning portion is a hole 62c penetrating the opposing portion 62 in the axial direction. The busbar assembly 50 has a protrusion 56 passing through the hole 62c from the other axial side. Therefore, the radial positioning of the busbar assembly 50 can be easily performed by passing the protrusion 56 through the hole 62c. Furthermore, the protrusion 56 is caught in the hole 62c, which can suppress relative rotation between the busbar assembly 50 and the cover member 60 in the circumferential direction.

[0094] According to the present embodiment, the axial positioning portion 62d is a peripheral portion of the hole portion 62c in the facing portion 62, and is in contact with the busbar assembly 50 from one axial side. Therefore, by forming the hole portion 62c, which is a radial positioning portion, the axial positioning portion 62d can also be formed. This makes it easier to manufacture the cover member 60 compared to a case in which the axial positioning portion 62d is formed at a location other than the hole portion 62c. Furthermore, by passing the protrusion portion 56 through the hole portion 62c to bring the busbar assembly 50 into contact with the facing portion 62, the busbar assembly 50 can be positioned in the radial direction and can also be positioned in the axial direction. Therefore, the busbar assembly 50 can be easily positioned in both the axial and radial directions by the cover member 60.

[0095] Furthermore, according to this embodiment, the busbar assembly 50 contacts the stator 42 from one axial side. Therefore, the busbar assembly 50 can be positioned by being sandwiched between the stator 42 and the cover member 60 in the axial direction. This allows the busbar assembly 50 to be positioned in the axial direction with greater precision. This makes it easier to connect the coil 42c to the coil connection portions 52Ae, 52Be, 52Ce and to connect the board 80 to the board connection portions 52Af, 52Bf, 52Cf.

[0096] Moreover, according to the present embodiment, the cylindrical portion 61 surrounds the coil end 42g. Therefore, it is possible to prevent the coil end 42g from contacting the housing 30. Moreover, the end portion on the other axial side of the cylindrical portion 61 faces one axial side of the stator core 42a via a gap. Therefore, it is possible to prevent the cover member 60 inserted into the stator accommodating portion 35 from hitting the stator core 42a before contacting the busbar assembly 50. This allows the axial positioning portion 62d of the cover member 60 to be suitably brought into contact with the busbar assembly 50 from one axial side. Therefore, it is possible to more suitably position the busbar assembly 50 in the axial direction by the cover member 60.

[0097] Furthermore, according to this embodiment, the protrusions 56 are fixed to the opposing portions 62 by heat welding. This makes it possible to suppress relative axial movement between the busbar assembly 50 and the cover member 60. As a result, even if the cover member 60 abuts against the stator core 42a from one axial side before coming into axial contact with the busbar assembly 50, the cover member 60 abuts against the stator core 42a and is positioned in the axial direction, thereby indirectly positioning the busbar assembly 50 in the axial direction. Note that in this case, the axial positioning portion of the cover member 60 is the portion of the opposing portion 62 to which the protrusions 56 are heat welded.

[0098] Furthermore, according to the present embodiment, the cylindrical portion 61 is fitted to the inner circumferential surface of the stator accommodating portion 35. This makes it possible to prevent the cylindrical portion 61 from moving in the radial direction within the stator accommodating portion 35. As a result, by positioning the busbar assembly 50 in the radial direction using the hole portion 62c of the cover member 60, it is possible to more suitably prevent the busbar assembly 50 from moving in the radial direction.

[0099] Moreover, according to this embodiment, the cylindrical portion 61 has an elastic deformation portion 63 that is elastically deformable in the radial direction. The elastic deformation portion 63 is pressed against the inner circumferential surface of the stator accommodating portion 35 from the radially inside. This makes it possible to suitably prevent the cylindrical portion 61 from rattling in the radial direction inside the stator accommodating portion 35. Furthermore, the cylindrical portion 61 can be positioned with high axial accuracy with respect to the central axis J, and the radial positioning accuracy of the busbar assembly 50 by the cover member 60 can also be improved.

[0100] According to this embodiment, the radially outer surface of the elastically deforming portion 63 has an inclined surface 63a that is positioned radially inward toward the other axial side. Therefore, when the cover member 60 is fitted into the stator accommodating portion 35, the inclined surface 63a comes into contact with the inner edge of the opening 35a and is pressed radially inward. This makes it possible to easily place the cover member 60 in the stator accommodating portion 35 while elastically deforming the elastically deforming portion 63 in a suitable radially inward manner.

[0101] Furthermore, according to this embodiment, the cover member 33 has the bearing holding tubular portion 33b that holds the bearing 43a that rotatably supports the rotor 41. Therefore, it is possible to suppress an increase in the number of parts of the rotating electric machine 10 compared to a case in which a separate member for holding the bearing 43a is provided. Furthermore, the bearing holding tubular portion 33b is located radially inside the tubular portion 61. Therefore, the cover member 60 can be suitably disposed in the stator accommodating portion 35 while the cover member 33 holds the bearing 43a.

[0102] 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. The busbar assembly may have any configuration as long as it has a busbar, a busbar holder, and a fixing member and is radially inserted into the connection hole. The busbar and the fixing member may be held in any manner relative to the busbar holder. The coil connection portion does not have to overlap with the opening of the stator accommodating portion when viewed from one axial side. The shape of the coil connection portion is not particularly limited.

[0103] The fixing member may have any configuration as long as it is held by the busbar holder and fixed to the housing. The fixing member may be fixed to the stator accommodating portion. The fixing member does not have to be a plate-shaped member. The fixing member may be fixed to the housing by a method other than screw fastening, such as welding. The busbar assembly may contact the housing from one axial side. In this case, for example, the abutment portion 57 in the above-mentioned embodiment may abut against a step or the like provided on the inner circumferential surface of the stator accommodating portion 35 from one axial side. The fixing member does not have to be provided.

[0104] The cover member may have any configuration as long as it has a cylindrical portion and an opposing portion located on one axial side of the busbar assembly in the stator accommodating portion. The opposing portion may have any configuration as long as it has an axial positioning portion that positions the busbar assembly in the axial direction. The opposing portion does not have to be annular. The axial positioning portion may have any configuration as long as it can position the busbar assembly in the axial direction. When the cover member is fixed to the busbar assembly as in the above-mentioned embodiment, a portion of the cover member to which the busbar assembly is fixed may be the axial positioning portion. The radial positioning portion may have any configuration as long as it can position the busbar assembly in the radial direction. The radial positioning portion may not be provided. The cover member may not have a claw portion that is hooked from one axial side to a held portion of the elastic member held by the opposing portion. The cover member may not have an elastic deformation portion.

[0105] The elastic member may have any configuration as long as it is located between the lid member and the cover member in the axial direction and applies a force to the cover member in the other axial direction. The elastic member may be a coil spring or a sealing member such as an O-ring that elastically deforms in the axial direction. The elastic member does not have to be provided.

[0106] The use 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 use of a pump equipped with a rotating electric machine 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 may be combined as appropriate within a range that does not contradict each other. [Explanation of symbols]

[0107] 10... rotating electric machine, 20... pump mechanism, 30... housing, 31b... connection hole, 33... cover member, 33b... bearing holding cylinder portion, 35... stator accommodating portion, 35a... opening, 37... substrate accommodating portion, 41... rotor, 42... stator, 42a... stator core, 42c... coil, 42g... coil end, 43a... bearing, 50... bus bar assembly, 51... bus bar holder, 52, 52A, 52 B, 52C...busbar, 52Ae, 52Be, 52Ce...coil connection portion, 52Af, 52Bf, 52Cf...board connection portion, 56...projection portion, 60...cover member, 61...cylindrical portion, 62...facing portion, 62c...hole portion (radial positioning portion), 62d...axial positioning portion, 63...elastic deformation portion, 64...claw portion, 70...elastic member, 71...held portion, 72...contact portion, 80...board, 100...pump, J...central axis

Claims

1. a rotor rotatable about a central axis extending in an axial direction; a stator having a coil and facing the rotor with a gap therebetween; a substrate electrically connected to the coil; a bus bar assembly including a bus bar electrically connecting the coil and the substrate and a bus bar holder for holding the bus bar; a housing having a stator accommodating portion for accommodating the stator therein and a board accommodating portion for accommodating the board therein; a cover member having a cylindrical portion surrounding one end of the stator in the axial direction; Equipped with the substrate accommodating portion is located radially outward of the stator accommodating portion, the housing has a connection hole that connects an inside of the stator accommodating portion and an inside of the board accommodating portion, The bus bar assembly is radially inserted through the connection hole, The bus bar is a coil connection portion electrically connected to the coil within the stator housing portion; a board connection portion electrically connected to the board within the board accommodation portion; having the bus bar assembly is located on one axial side of the stator in the stator accommodating portion, The stator accommodating portion has an opening portion that opens to one axial side, The housing has a cover member that closes the opening, the cover member has an opposing portion located on one axial side of the bus bar assembly within the stator accommodating portion, the facing portion has an axial positioning portion that positions the bus bar assembly in the axial direction, Further, an elastic member is provided between the lid member and the cover member in the axial direction, and applies a force to the cover member in the other axial direction. The elastic member is A held portion held on one axial side of the opposing portion; a contact portion connected to the held portion and contacting the cover member from the other axial side; A rotating electric motor having the above structure.

2. The cover member has a claw portion hooked on the held portion from one axial side.

2. The rotating electric machine according to claim 1.

3. The facing portion has a radial positioning portion for positioning the bus bar assembly in a radial direction. The rotating electric machine according to claim 1 or 2, wherein

4. a rotor rotatable about a central axis extending in an axial direction; a stator having a coil and facing the rotor with a gap therebetween; a substrate electrically connected to the coil; a bus bar assembly including a bus bar electrically connecting the coil and the substrate and a bus bar holder for holding the bus bar; a housing having a stator accommodating portion for accommodating the stator therein and a board accommodating portion for accommodating the board therein; a cover member having a cylindrical portion surrounding one end of the stator in the axial direction; Equipped with the substrate accommodating portion is located radially outward of the stator accommodating portion, the housing has a connection hole that connects an inside of the stator accommodating portion and an inside of the board accommodating portion, The bus bar assembly is radially inserted through the connection hole, The bus bar is a coil connection portion electrically connected to the coil within the stator housing portion; a board connection portion electrically connected to the board within the board accommodation portion; having the bus bar assembly is located on one axial side of the stator in the stator accommodating portion, The stator accommodating portion has an opening portion that opens to one axial side, The housing has a cover member that closes the opening, the cover member has an opposing portion located on one axial side of the bus bar assembly within the stator accommodating portion, the facing portion has an axial positioning portion that positions the bus bar assembly in the axial direction, The opposing portion has a radial positioning portion that positions the bus bar assembly in a radial direction.

5. The radial positioning portion is a hole portion that penetrates the opposing portion in the axial direction, The bus bar assembly has a protrusion that is inserted into the hole from the other axial side. The rotating electric machine according to claim 3 or claim 4.

6. The axial positioning portion is a peripheral portion of the hole in the facing portion, and the bus bar 8. The rotating electric machine according to claim 7, wherein the assembly is in contact with the rotor from one axial side.

7. the cylindrical portion is fitted to an inner circumferential surface of the stator accommodating portion, The cylindrical portion has an elastically deformable portion that is elastically deformable in a radial direction, The rotating electric machine according to claim 1 , wherein the elastically deformable portion is pressed against an inner circumferential surface of the stator housing portion from a radially inner side.

8. a rotor rotatable about a central axis extending in an axial direction; a stator having a coil and facing the rotor with a gap therebetween; a substrate electrically connected to the coil; a bus bar assembly including a bus bar electrically connecting the coil and the substrate and a bus bar holder for holding the bus bar; a housing having a stator accommodating portion for accommodating the stator therein and a board accommodating portion for accommodating the board therein; a cover member having a cylindrical portion surrounding one end of the stator in the axial direction; Equipped with the substrate accommodating portion is located radially outward of the stator accommodating portion, the housing has a connection hole that connects an inside of the stator accommodating portion and an inside of the board accommodating portion, The bus bar assembly is radially inserted through the connection hole, The bus bar is a coil connection portion electrically connected to the coil within the stator housing portion; a board connection portion electrically connected to the board within the board accommodation portion; having the bus bar assembly is located on one axial side of the stator in the stator accommodating portion, The stator accommodating portion has an opening portion that opens to one axial side, The housing has a cover member that closes the opening, the cover member has an opposing portion located on one axial side of the bus bar assembly within the stator accommodating portion, the facing portion has an axial positioning portion that positions the bus bar assembly in the axial direction, and the cylindrical portion is fitted to an inner circumferential surface of the stator accommodating portion, The cylindrical portion has an elastically deformable portion that is elastically deformable in a radial direction, The elastic deformation portion is pressed against an inner circumferential surface of the stator accommodating portion from the radially inner side.

9. The cover member is disposed between the lid member and the cover member in the axial direction.

9. The rotating electric machine according to claim 4, further comprising an elastic member for applying a force in the other direction.

10. The bus bar assembly is connected to the stator or the housing from one axial side. The rotating electric machine according to claim 1 , wherein the rotating electric machine is in contact with the first and second poles.

11. The stator has a stator core fixed in the stator housing portion, The coil has a coil end that protrudes toward one axial side beyond the stator core, The cylindrical portion surrounds the coil end, The other axial end of the cylindrical portion is disposed on one axial side of the stator core via a gap. The rotating electric machine according to claim 10 , wherein the first and second electrodes are opposed to each other.

12. The cover member is a bearing holder that holds a bearing that rotatably supports the rotor. A cylindrical portion is provided.

12. The bearing holding cylindrical portion according to claim 1, wherein the bearing holding cylindrical portion is located radially inside the cylindrical portion. The rotating electric machine according to any one of claims 1 to 7.

13. A rotating electric machine according to any one of claims 1 to 12, a pump mechanism connected to the rotor; A pump comprising:

Images