Rotating electric machines and pumps

Abstract

To provide a rotary electric machine having a structure in which a bearing holder can be stably fixed to a housing while suppressing upsizing in a radial direction, and a pump.SOLUTION: In a rotary electric machine, a bearing holder 70 includes: a holder body portion 71 that holds a bearing; and a plurality of projected portions 72 that are projected radially outward from the holder body portion 71. A housing includes: a housing body portion that has an opening opened to one side in an axial direction, and houses a rotor and a stator therein; and a lid portion that closes the opening. The housing body portion includes: a fixation portion to which the bearing holder 70 is fixed; and a frame-like portion 38 that surrounds a center axis. The opening is provided in the frame-like portion 38. The frame-like portion 38 includes a plurality of first screwing portions 38i, 38j, 38k, 38m, 38r where the lid part is fixed with screws. The fixation portion includes a plurality of second screwing portions 39a, 39b, 39c, 39d where the respective plurality of projected portions are fixed with screws.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] There is known a rotating electric machine having a structure in which a bearing holder is fixed to a casing. For example, Patent Document 1 describes a rotating electric machine having a structure in which a bearing holder is fixed by a press-fit ring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-28203 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the bearing holder is fixed with a press-fit ring as in Patent Document 1, the fixing of the bearing holder tends to become unstable. In order to stably fix the bearing holder, a method of fixing the bearing holder with a screw at a position radially away from the central axis of the rotating electric machine can be considered. However, in this case, there is a problem that the rotating electric machine tends to become large in the radial direction.

[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 in which a bearing holder can be stably fixed to a housing while suppressing an increase in radial size. [Means for solving the problem]

[0006] 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 facing the rotor with a gap therebetween, a housing that accommodates the rotor and the stator, a bearing that rotatably supports the rotor, and a bearing holder that holds the bearing and is fixed to the housing. The bearing holder has a holder main body that holds the bearing, and a plurality of protrusions that protrude radially outward from the holder main body. The housing has an opening that opens to one axial side, and includes a housing main body that accommodates the rotor and the stator, and a lid that is fixed to one axial side of the housing main body and closes the opening. The housing main body has a fixed portion to which the bearing holder is fixed, and a frame-shaped portion that protrudes from the fixed portion to one axial side and surrounds the central axis. The opening is provided in the frame-shaped portion. The frame-shaped portion has a plurality of first screw fastening portions to which the lid portion is fixed with screws. The fixed portion has a plurality of second screw fastening portions to which the plurality of protruding portions are respectively fixed with screws. The plurality of first screw fastening portions and the plurality of second screw fastening portions are arranged to be shifted from each other in the circumferential direction.

[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, it is possible to stably fix the bearing holder to the housing while suppressing an increase in the radial size of the rotating electric machine. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a part of a pump according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing a part of the rotating electric machine according to the first embodiment. [Diagram 3] FIG. 3 is a perspective view showing a part of the housing of the first embodiment. [Figure 4] FIG. 4 is a view of a part of the housing and a bearing holder of the first embodiment, viewed from one axial side. [Diagram 5] FIG. 5 is a view of a part of a housing and a bearing holder according to the second embodiment, viewed from one axial side. 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 progresses counterclockwise around the central axis J when viewed from one axial side (+Y side). The other circumferential side is the side that progresses clockwise 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 on the Z-axis points (+Z side) is called the "upper side." The side of the vertical direction Z opposite to the side toward which the arrow on 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 on the X-axis points (+X side) is called "one side of the width direction." The side of the width direction X opposite to the side toward which the arrow on the X-axis points (-X side) is called "the other side of the width direction." The axial direction, the vertical direction Z, and the width direction X are perpendicular to each other.

[0013] In this embodiment, the width direction X corresponds to the “first direction”, and the vertical direction Z corresponds to the “second direction”. Note that the vertical direction Z, the width direction X, the upper side, and the lower side are names simply for explaining 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.

[0014] First Embodiment 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.

[0015] 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 first busbar assembly 51, a second busbar assembly 52, a resin member 60, a bearing holder 70, and a first circuit board 80.

[0016] 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.

[0017] 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 plurality of coils 42c are attached to the plurality of teeth 42e, respectively, via the insulator 42b.

[0018] The housing 30 accommodates the pump mechanism 20, the rotor 41, the stator 42, the bearings 43a, 43b, the first busbar assembly 51, the second busbar assembly 52, a resin member 60, a bearing holder 70, and a first circuit board 80 therein.

[0019] The housing 30 has a housing main body 31, a board cover 32, a lid portion 33, and a pump cover 34. The housing main body 31, the board cover 32, the lid portion 33, and the pump cover 34 are separate members. The board cover 32 is fixed to the underside of the housing main body 31. The lid portion 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.

[0020] The housing body 31 has a motor housing 35, a pump housing 36, a base housing 37a, and a mounting portion 37b. In this embodiment, the motor housing 35, the pump housing 36, the base housing 37a, and the mounting portion 37b are all part of the same single member.

[0021] In this embodiment, the motor housing 35 is cylindrical and extends in the axial direction. An end portion on one axial side (+Y side) of the motor housing 35 is an end portion on one axial side of the housing main body 31, and is an opening portion 35a that opens to one axial side. In other words, the housing main body 31 has an opening portion 35a that opens to one axial side. The opening portion 35a is closed by the lid portion 33.

[0022] The motor housing 35 has a cylindrical motor housing main body 35b extending in the axial direction, an annular fixed portion 39 protruding radially outward from an end portion on one axial side (+Y side) of the motor housing main body 35b, and a frame-shaped portion 38 protruding axially from a radial outer edge portion of the fixed portion 39. That is, the housing main body 31 has the fixed portion 39 and the frame-shaped portion 38. The motor housing main body 35b is cylindrical with the central axis J as its center. The motor housing main body 35b accommodates a rotor 41 and a stator 42 therein. As a result, the housing main body 31 accommodates the rotor 41 and the stator 42 therein.

[0023] The frame-shaped portion 38 is connected to one axial side (+Y side) of the motor housing main body 35b via the fixed portion 39. The one axial end of the frame-shaped portion 38 is the one axial end of the motor housing 35, and is the opening 35a. That is, the opening 35a is provided in the frame-shaped portion 38. As shown in FIG. 3 and FIG. 4, the frame-shaped portion 38 surrounds the central axis J. In this embodiment, the frame-shaped portion 38 is a substantially square frame with rounded corners. The radial inner side surface of the frame-shaped portion 38 is located radially outward from the inner peripheral surface of the motor housing main body 35b. The frame-shaped portion 38 has a pair of first side portions 38a, 38b, a pair of second side portions 38c, 38d, and four connection portions 38e, 38f, 38g, 38h.

[0024] The pair of first side portions 38a, 38b extend along a width direction X perpendicular to the axial direction. The pair of first side portions 38a, 38b are arranged at a distance from each other across the central axis J in a vertical direction Z perpendicular to both the axial direction and the width direction X. The first side portion 38a is a portion that forms an upper side of the frame portion 38 having a substantially square frame shape. The first side portion 38b is a portion that forms a lower side of the frame portion 38 having a substantially square frame shape.

[0025] The pair of second side portions 38c, 38d extend along the up-down direction Z. The pair of second side portions 38c, 38d are disposed at a distance from each other in the width direction X, sandwiching the central axis J therebetween. The second side portion 38c is a portion that constitutes a side on one width direction side (+X side) of the substantially square frame-shaped portion 38. The second side portion 38d is a portion that constitutes a side on the other width direction side (-X side) of the substantially square frame-shaped portion 38.

[0026] The four connecting parts 38e, 38f, 38g, and 38h connect the ends of the first side parts 38a and 38b in the width direction X and the ends of the second side parts 38c and 38d in the up-down direction Z, respectively. The four connecting parts 38e, 38f, 38g, and 38h are parts that respectively constitute the four corners of the frame part 38, which is a substantially square frame with rounded corners. The connecting parts 38e, 38f, 38g, and 38h are arc-shaped and convex radially outward when viewed in the axial direction. The connecting part 38e connects the end of one side in the width direction (+X side) of the first side part 38a and the upper end of the second side part 38c. The connecting part 38f connects the end of one side in the width direction of the first side part 38b and the lower end of the second side part 38c. The connecting portion 38g connects the end portion on the other width direction side (-X side) of the first side portion 38b to the lower end portion of the second side portion 38d. The connecting portion 38h connects the end portion on the other width direction side of the first side portion 38a to the upper end portion of the second side portion 38d.

[0027] The frame-shaped portion 38 has a plurality of first screw fastening portions 38r. Each of the plurality of first screw fastening portions 38r has a female screw hole 38n recessed from a surface on one axial side (+Y side) of the frame-shaped portion 38 to the other axial side (-Y side). As shown in FIG. 2, the lid portion 33 is fixed to each of the first screw fastening portions 38r with a screw 94. The screw 94 is passed through a through hole 33b provided in the lid portion 33 from one axial side and fastened into the female screw hole 38n. In this way, the lid portion 33 is fixed to the frame-shaped portion 38.

[0028] As shown in FIG. 3 and FIG. 4, in this embodiment, the first screw fastening portions 38r are arranged at intervals from each other along the circumferential direction. In this embodiment, the first screw fastening portions 38r are provided in four portions, namely, the first screw fastening portion 38i, the first screw fastening portion 38j, the first screw fastening portion 38k, and the first screw fastening portion 38m. The first screw fastening portion 38i is provided on the first side portion 38a. The first screw fastening portion 38j is provided on the first side portion 38b. The first screw fastening portion 38k is provided on the second side portion 38c. The first screw fastening portion 38m is provided on the second side portion 38d. Thus, in this embodiment, the first screw fastening portions 38r are provided on each of the pair of first side portions 38a, 38b and the pair of second side portions 38c, 38d.

[0029] The first screw fastening portion 38i is provided on a portion of the first side 38a closer to the other widthwise side (-X side). The first screw fastening portion 38i is located on the other widthwise side of the central axis J. The first screw fastening portion 38j is provided on a portion of the first side 38b closer to one widthwise side (+X side). The first screw fastening portion 38j is located on one widthwise side of the central axis J. In this manner, in this embodiment, the first screw fastening portion 38i provided on one of the pair of first sides 38a, 38b and the first screw fastening portion 38j provided on the other of the pair of first sides 38a, 38b are arranged to be shifted from each other in the widthwise direction X.

[0030] The first screw fastening portion 38k is provided on an upper portion of the second side portion 38c. The first screw fastening portion 38k is located above the central axis J. The first screw fastening portion 38m is provided on a lower portion of the second side portion 38d. The first screw fastening portion 38m is located below the central axis J. Thus, in this embodiment, the first screw fastening portion 38k provided on one of the pair of second sides 38c, 38d and the first screw fastening portion 38m provided on the other of the pair of second sides 38c, 38d are arranged to be shifted from each other in the up-down direction Z.

[0031] In this embodiment, the arrangement of the multiple first screw fastening portions 38r is rotationally symmetric about the central axis J. More specifically, the arrangement of the multiple first screw fastening portions 38r is four-fold symmetric about the central axis J. In other words, when the frame-shaped portion 38 is rotated 90° about the central axis J, each of the first screw fastening portions 38r in the frame-shaped portion 38 after the rotation overlaps with the position where each of the first screw fastening portions 38r in the frame-shaped portion 38 before the rotation was located.

[0032] In this embodiment, the first screw fastening portion 38r is substantially circular when viewed in the axial direction. The first screw fastening portion 38r protrudes from each of the sides provided on both sides in the radial direction. That is, each of the first screw fastening portions 38r has an inner portion 38p that protrudes radially inward on the radial inner side surface of the frame-shaped portion 38. The inner portion 38p of the first screw fastening portion 38i is substantially semicircular when viewed in the axial direction and protrudes downward from the first side portion 38a. The inner portion 38p of the first screw fastening portion 38j is substantially semicircular when viewed in the axial direction and protrudes upward from the first side portion 38b. The inner portion 38p of the first screw fastening portion 38k is substantially semicircular when viewed in the axial direction and protrudes from the second side portion 38c to the other width direction side (-X side). The inner portion 38p of the first screw fastening portion 38m has a generally semicircular shape that protrudes from the second side portion 38d to one side in the width direction (the +X side) when viewed in the axial direction.

[0033] The portions of the first screw fastening portion 38r that protrude radially outward from each side portion have a substantially semicircular shape when viewed in the axial direction. The radius of the female screw hole 38n in the inner portion 38p is larger than the radius of the female screw hole 38n in the portions of the first screw fastening portion 38r that protrude radially outward from each side portion.

[0034] The fixed part 39 is a portion to which the bearing holder 70 is fixed. As shown in FIG. 3, the fixed part 39 has a surface facing one axial side (+Y side) and is annular surrounding the central axis J. The radial inner edge of the fixed part 39 is circular about the central axis J. The radial outer edge of the fixed part 39 is connected to the radial inner surface of the frame-shaped part 38. The fixed part 39 protrudes radially inward from the radial inner surface of the frame-shaped part 38. The fixed part 39 is located away from the end face on one axial side of the frame-shaped part 38 toward the other axial side (-Y side).

[0035] The fixed portion 39 has a plurality of second screw fastening portions 39r. Each of the plurality of second screw fastening portions 39r has an internally threaded hole 39e recessed from a surface on one axial side (+Y side) of the fixed portion 39 to the other axial side (-Y side). As shown in FIG. 2, the bearing holder 70 is fixed to each second screw fastening portion 39r with a screw 92. The screw 92 is passed through a through hole 72e provided in the bearing holder 70 from one axial side and tightened into the internally threaded hole 39e. In this way, the bearing holder 70 is fixed to the fixed portion 39.

[0036] As shown in FIG. 3, the surface on one axial side (+Y side) of the second screw fastening portion 39r is recessed toward the other axial side (-Y side) than the surface on one axial side of the portion of the fixed portion 39 other than the second screw fastening portion 39r. The second screw fastening portion 39r protrudes radially outward from the radial inner edge of the fixed portion 39. The circumferential dimension of the second screw fastening portion 39r decreases toward the radial outer side. The radially outer edge of the second screw fastening portion 39r is arc-shaped and convex radially outward when viewed in the axial direction. The radially outer edge of the second screw fastening portion 39r is located at the radial outer edge of the fixed portion 39.

[0037] An edge 39g on one circumferential side (+θ side) of the second screw fastening portion 39r extends linearly in a direction inclined toward the circumferential direction with respect to the radial direction. The edge 39g is positioned toward the other circumferential side (-θ side) as it moves toward the radially outward side. An edge 39h on the other circumferential side (-θ side) of the second screw fastening portion 39r extends linearly in a direction inclined toward the circumferential direction with respect to the radial direction. The edge 39h is positioned toward one circumferential side (+θ side) as it moves toward the radially outward side. The edge 39g and the edge 39h approach each other as they move toward the radially outward side. The inclination of the edge 39g in the circumferential direction with respect to the radial direction is smaller than the inclination of the edge 39h in the circumferential direction with respect to the radial direction.

[0038] In this embodiment, the second screw fastening portions 39r are arranged at intervals from each other along the circumferential direction. In this embodiment, the second screw fastening portions 39r are provided in four portions, namely, the second screw fastening portion 39a, the second screw fastening portion 39b, the second screw fastening portion 39c, and the second screw fastening portion 39d. The second screw fastening portion 39a is located radially inside the connecting portion 38e when viewed in the axial direction. The second screw fastening portion 39b is located radially inside the connecting portion 38f when viewed in the axial direction. The second screw fastening portion 39c is located radially inside the connecting portion 38g when viewed in the axial direction. The second screw fastening portion 39d is located radially inside the connecting portion 38h when viewed in the axial direction. That is, in this embodiment, the second screw fastening portions 39r are provided one each on the radial inside of the four connecting portions 38e, 38f, 38g, and 38h when viewed in the axial direction.

[0039] The second screw fastening portion 39a protrudes from the radial inner edge of the fixed portion 39 to one width direction side (+X side) and diagonally upward. The second screw fastening portion 39b protrudes from the radial inner edge of the fixed portion 39 to one width direction side and diagonally downward. The second screw fastening portion 39c protrudes from the radial inner edge of the fixed portion 39 to the other width direction side (-X side) and diagonally downward. The second screw fastening portion 39d protrudes from the radial inner edge of the fixed portion 39 to the other width direction side and diagonally upward.

[0040] In this embodiment, the second screw fastening portions 39r are arranged in a rotationally symmetrical arrangement about the central axis J. More specifically, the second screw fastening portions 39r are arranged in a four-fold symmetrical arrangement about the central axis J. In other words, when the fixed portion 39 is rotated 90° about the central axis J, each of the second screw fastening portions 39r in the fixed portion 39 after the rotation overlaps with the position where each of the second screw fastening portions 39r in the fixed portion 39 before the rotation was located.

[0041] The first screw fastening portions 38r and the second screw fastening portions 39r are arranged to be shifted from each other in the circumferential direction. In this embodiment, one first screw fastening portion 38r is arranged between each of the second screw fastening portions 39r in the circumferential direction as viewed in the axial direction. In other words, the first screw fastening portions 38r and the second screw fastening portions 39r are arranged alternately along the circumferential direction as viewed in the axial direction.

[0042] In this specification, "the first screw fastening portion and the second screw fastening portion are arranged alternately along the circumferential direction when viewed in the axial direction" means that the circumferential positions of the first screw fastening portion and the second screw fastening portion alternate along the circumferential direction, regardless of the relative radial positions of the first screw fastening portion and the second screw fastening portion.

[0043] When viewed in the axial direction, a first screw fastening portion 38k is disposed between the second screw fastening portion 39a and the second screw fastening portion 39b in the circumferential direction. When viewed in the axial direction, a first screw fastening portion 38j is disposed between the second screw fastening portion 39b and the second screw fastening portion 39c in the circumferential direction. When viewed in the axial direction, a first screw fastening portion 38m is disposed between the second screw fastening portion 39c and the second screw fastening portion 39d in the circumferential direction. When viewed in the axial direction, a first screw fastening portion 38i is disposed between the second screw fastening portion 39d and the second screw fastening portion 39a in the circumferential direction.

[0044] In this embodiment, each of the first screw fastening portions 38r is disposed so as to be shifted in the circumferential direction with respect to the center of the second screw fastening portions 39r adjacent to each other in the circumferential direction. More specifically, each of the first screw fastening portions 38r is disposed so as to be shifted to the other circumferential side (-θ side) with respect to the center of the second screw fastening portions 39r adjacent to each other in the circumferential direction.

[0045] When viewed in the axial direction, each of the first screw fastening portions 38r is disposed adjacent to one circumferential side (+θ side) of each of the second screw fastening portions 39r. When viewed in the axial direction, the first screw fastening portion 38i is disposed adjacent to one circumferential side of the second screw fastening portion 39d. When viewed in the axial direction, the first screw fastening portion 38j is disposed adjacent to one circumferential side of the second screw fastening portion 39b. When viewed in the axial direction, the first screw fastening portion 38k is disposed adjacent to one circumferential side of the second screw fastening portion 39a. When viewed in the axial direction, the first screw fastening portion 38m is disposed adjacent to one circumferential side of the second screw fastening portion 39c.

[0046] 1, the pump housing 36 is connected to the other axial side (-Y side) of the motor housing 35. The pump housing 36 has an accommodating recess 36a that is a recess that opens to the other axial side. The opening on the other axial side of the accommodating recess 36a is closed by the pump cover 34.

[0047] The board housing 37a is located below the motor housing 35 and the pump housing 36. The board housing 37a extends in the axial direction. An end portion on the other axial side (-Y side) of the board housing 37a protrudes further in the axial direction than the pump housing 36 and the pump cover 34. A connector portion 90 is provided at an end portion on the other axial side of the board housing 37a.

[0048] The board housing 37a has an accommodating recess 37c which is a recess that opens downward. The lower opening of the accommodating recess 37c is closed by the board cover 32. A first circuit board 80 is held inside the accommodating recess 37c. The first circuit board 80 has a circuit board main body 81 whose plate surface faces the vertical direction Z, and a plurality of electronic components 82 attached to the circuit board main body 81. The electronic components 82 include, for example, transistors that constitute an inverter circuit that supplies power to the stator 42. The mounting portion 37b is located on one widthwise side (+X side) of the motor housing 35 and the pump housing 36. The mounting portion 37b is a portion that is fixed to a vehicle device by a screw.

[0049] The housing body 31 has a first through hole 31a that axially connects the inside of the motor housing 35 and the inside of the accommodating recess 36a. An oil seal 44 that seals between the inner peripheral surface of the first through hole 31a and the outer peripheral surface of the shaft 41a is held in the first through hole 31a. A bearing 43b is held in the first through hole 31a on one axial side (+Y side) of the oil seal 44. The housing body 31 has a second through hole 31b that radially connects the inside of the motor housing 35 and the inside of the accommodating recess 37c. The second through hole 31b is provided in a portion on one axial side of the housing body 31, and penetrates a wall portion between the inside of the motor housing 35 and the inside of the accommodating recess 37c in the up-down direction Z.

[0050] As shown in FIG. 2, the outer shape of the cover portion 33 as viewed in the axial direction is a substantially square shape with rounded corners. The outer shape of the cover portion 33 as viewed in the axial direction is the same as the outer shape of the frame portion 38 as viewed in the axial direction. The cover portion 33 has a plurality of third screw fastening portions 33a on the radial outer edge portion. Each of the plurality of third screw fastening portions 33a has a through hole 33b penetrating the cover portion 33 in the axial direction. Each of the third screw fastening portions 33a is fixed to each of the first screw fastening portions 38r by a screw 94 passed through the through hole 33b from one axial side (+Y side). A breather 91 is attached to the cover portion 33.

[0051] As shown in FIG. 1, the resin member 60 is located inside the motor housing main body 35b on one axial side (+Y side) of the stator 42. The resin member 60 has an outer cylinder portion 61, an inner cylinder portion 63, and a connecting portion 62. The outer cylinder portion 61 is cylindrical and surrounds the central axis J, and is fitted inside the motor housing main body 35b. The outer cylinder portion 61 opens to the other axial side (-Y side). An end portion on the other axial side of the outer cylinder portion 61 surrounds portions of the insulator 42b and the coil 42c that protrude further toward the one axial side than the stator core 42a.

[0052] The inner cylinder portion 63 is cylindrical and surrounds the central axis J. The inner cylinder portion 63 is open on both axial sides. The inner cylinder portion 63 is located radially inside the outer cylinder portion 61. The end portion on the other axial side (-Y side) of the inner cylinder portion 63 is located closer to one axial side (+Y side) than the end portion on the other axial side of the outer cylinder portion 61. The connecting portion 62 connects the end portion on one axial side of the outer cylinder portion 61 and the end portion on one axial side of the inner cylinder portion 63. The connecting portion 62 is annular and surrounds the central axis J.

[0053] The bearing holder 70 is a member that holds the bearing 43a. The bearing holder 70 is located on one axial side (+Y side) of the resin member 60 inside the motor housing main body 35b. As shown in FIG. 2, the bearing holder 70 has a holder main body 71 and a plurality of protrusions 72. The holder main body 71 has a retaining tube portion 71a and a flange portion 71b. The retaining tube portion 71a is cylindrical and surrounds the central axis J. The retaining tube portion 71a opens on both axial sides. As shown in FIG. 1, the retaining tube portion 71a is inserted into the inner tube portion 63 from one axial side (+Y side). In this embodiment, the retaining tube portion 71a is fitted into the inner tube portion 63. An end portion of the retaining tube portion 71a on one axial side (+Y side) is located on one axial side of the inner tube portion 63.

[0054] An annular wall portion 71c protruding radially inward is provided at the axial center of the inner peripheral surface of the holding cylinder portion 71a. The annular wall portion 71c is annular and surrounds the central axis J. The bearing 43a is fitted and held in a portion of the inside of the holding cylinder portion 71a located on the other axial side (-Y side) of the annular wall portion 71c. In this way, the holder main body portion 71 holds the bearing 43a. A rib 71d protruding radially inward is provided on the inner peripheral surface of a portion of the holding cylinder portion 71a located on one axial side (+Y side) of the annular wall portion 71c. The rib 71d extends in the axial direction. A plurality of ribs 71d are provided at intervals in the circumferential direction.

[0055] One axial side (+Y side) of the shaft 41a passes through the inside of the retaining cylinder 71a. The end of the shaft 41a on one axial side is located inside a portion of the retaining cylinder 71a that is located on one axial side of the annular wall 71c. A sensor magnet 46 is attached to the end of the shaft 41a on one axial side via an attachment member 45. The attachment member 45 and the sensor magnet 46 are located inside a portion of the retaining cylinder 71a that is located on one axial side of the annular wall 71c.

[0056] The flange portion 71b protrudes radially outward from an end portion on one axial side (+Y side) of the holding tube portion 71a. As shown in FIG. 2, the flange portion 71b is annular and surrounds the central axis J. A through-hole 71f is provided in the center of the width direction X in the lower part of the flange portion 71b, penetrating the flange portion 71b in the axial direction. The through-hole 71f opens downward. The flange portion 71b is provided with a female screw hole 71e recessed from the surface on one axial side of the flange portion 71b to the other axial side (-Y side). The female screw hole 71e, for example, penetrates the flange portion 71b in the axial direction. A plurality of female screw holes 71e are provided at equal intervals around the circumference in the circumferential direction. In this embodiment, four female screw holes 71e are provided.

[0057] 1, the flange portion 71b is disposed facing one axial side (+Y side) of the resin member 60. The outer diameter of the flange portion 71b is approximately the same as the outer diameter of the resin member 60. An end portion on the other axial side (-Y side) of the flange portion 71b is fitted into the radial inside of the fixed portion 39. The flange portion 71b is provided within the end portion on one axial side (+Y side) of the motor housing main body 35b, and almost completely blocks that end portion.

[0058] As shown in FIG. 2, the multiple protrusions 72 protrude radially outward from the holder main body 71. In this embodiment, the multiple protrusions 72 protrude radially outward from the radial outer edge of the flange 71b. The radial outer portion of the protrusion 72 is recessed toward the other axial side (-Y side) than the radial inner portion of the protrusion 72. The radial outer portion of the protrusion 72 is provided with a through hole 72e that penetrates the protrusion 72 in the axial direction. A step portion 72f is provided between the radial outer portion of the protrusion 72 and the radial inner portion of the protrusion 72. The step portion 72f is in the shape of an arc centered on the through hole 72e when viewed in the axial direction.

[0059] The multiple protrusions 72 are provided at intervals in the circumferential direction. Four protrusions 72 are provided: protrusion 72a, protrusion 72b, protrusion 72c, and protrusion 72d. Protrusion 72a protrudes diagonally upward on one widthwise side (+X side). Protrusion 72b protrudes diagonally downward on one widthwise side. Protrusion 72c protrudes diagonally downward on the other widthwise side (-X side). Protrusion 72d protrudes diagonally upward on the other widthwise side.

[0060] The multiple protrusions 72 are fixed to the multiple second screw fastening portions 39r with screws 92, respectively. The screws 92 are passed through the through holes 72e from one axial side (+Y side) and screwed into the female threaded holes 39e. In this way, the bearing holder 70 is fixed to the housing 30. A surface on the other axial side (-Y side) of the protrusions 72 contacts a surface on one axial side of the second screw fastening portion 39r. The surface on one axial side of the protrusions 72 is located on the one axial side of the surface on the one axial side of the portion of the fixed portion 39 other than the second screw fastening portion 39r, and is located on the other axial side of the surface on one axial side of the frame-shaped portion 38.

[0061] 4, the protruding portion 72a is fixed to the second screw fastening portion 39a with a screw 92. The protruding portion 72b is fixed to the second screw fastening portion 39b with a screw 92. The protruding portion 72c is fixed to the second screw fastening portion 39c with a screw 92. The protruding portion 72d is fixed to the second screw fastening portion 39d with a screw 92.

[0062] The circumferential dimension of the protrusion 72 decreases toward the radially outward side. The radially outer edge of the protrusion 72 is an arc shape that is convex toward the radially outward side when viewed in the axial direction. An edge 72g on one circumferential side (+θ side) of the protrusion 72 extends linearly in a direction inclined toward the circumferential direction with respect to the radial direction. The edge 72g is located on the other circumferential side (-θ side) as it moves toward the radially outward side. An edge 72h on the other circumferential side (-θ side) of the protrusion 72 extends linearly in a direction inclined toward the circumferential direction with respect to the radial direction. The edge 72h is located on one circumferential side (+θ side) as it moves toward the radially outward side. The edge 72g and the edge 72h approach each other toward the radially outward side. The inclination of the edge 72g in the circumferential direction with respect to the radial direction is smaller than the inclination of the edge 72h in the circumferential direction with respect to the radial direction.

[0063] An edge 72g of the protruding portion 72 is disposed opposite an edge 39g of the second screw fastening portion 39r. The edge 72g of the protruding portion 72 and the edge 39g of the second screw fastening portion 39r extend parallel to each other. An edge 72h of the protruding portion 72 is disposed opposite an edge 39h of the second screw fastening portion 39r. The edge 72h of the protruding portion 72 and the edge 39h of the second screw fastening portion 39r extend parallel to each other.

[0064] Each protrusion 72 is disposed circumferentially opposite the inner portion 38p of each first screw fastening portion 38r. The portion of the protrusion 72 that faces the inner portion 38p in the circumferential direction is shaped along the circumferential side surface of the inner portion 38p. In this embodiment, the portion of the protrusion 72 that faces the inner portion 38p in the circumferential direction is an edge portion 72g. The circumferential side surface of the inner portion 38p is a part of the arc-shaped inner edge portion of the inner portion 38p. In this embodiment, the edge portion 72g extends along a tangent line that contacts the portion of the inner portion 38p that is closest to the protrusion 72 when viewed in the axial direction.

[0065] 1, the first busbar assembly 51 is inserted through the second through-hole 31b in the vertical direction Z and is provided to straddle the interior of the motor housing 35 and the interior of the accommodating recess 37c. The first busbar assembly 51 has a first busbar holder 51a made of resin and a first busbar 51b held by the first busbar holder 51a. The first busbar 51b electrically connects the coil 42c and the first circuit board 80.

[0066] The second busbar assembly 52 is located on one axial side (+Y side) of the bearing holder 70. The second busbar assembly 52 is located axially between the bearing holder 70 and the cover portion 33. The second busbar assembly 52 has a second busbar holder 52a made of resin, a second busbar 52b held by the second busbar holder 52a, a second circuit board 53, and a rotation sensor 54.

[0067] As shown in Fig. 2, the second bus bar holder 52a has a board holding portion 52c and an extension portion 52d. The board holding portion 52c has a substantially circular shape when viewed in the axial direction. The board holding portion 52c is fixed to the bearing holder 70 by a screw 93. The screw 93 is passed through a through hole provided in the board holding portion 52c from one axial side (+Y side) and fastened into the female threaded hole 71e. As shown in Fig. 1, the board holding portion 52c is disposed facing one axial side of the bearing holder 70.

[0068] A recess 52g recessed toward the other axial side (-Y side) is provided in the center of the board holding portion 52c. A second circuit board 53 is held inside the recess 52g. The second circuit board 53 is a rectangular plate whose plate surface faces the axial direction. A rotation sensor 54 is attached to the other axial side surface of the second circuit board 53. The rotation sensor 54 is exposed to the other axial side of the board holding portion 52c through a hole provided in the bottom of the recess 52g. The rotation sensor 54 faces the sensor magnet 46 with a gap in the axial direction. The rotation sensor 54 is a magnetic sensor capable of detecting the magnetic field of the sensor magnet 46. The rotation sensor 54 is capable of detecting the rotation of the rotor 41 by detecting a change in the magnetic field of the sensor magnet 46.

[0069] The extension 52d extends from the lower end of the board holding portion 52c toward the first circuit board 80. The extension 52d has a first portion 52e extending from the lower end of the board holding portion 52c toward the other axial side (-Y side) and a second portion 52f extending downward from the other axial end of the first portion 52e. The first portion 52e is passed through a through portion 71f provided in the bearing holder 70 in the axial direction. The second portion 52f is inserted into the second through hole 31b. The second bus bar 52b protrudes from the lower end of the second portion 52f and is connected to the first circuit board 80. The second bus bar 52b electrically connects the first circuit board 80 and the second circuit board 53.

[0070] The pump mechanism 20 is accommodated in the accommodation recess 36a. 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 accommodation recess 36a. In this way, the pump mechanism 20 is connected 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 are engaged with each other. When the inner rotor 21 is rotated by the shaft 41a, the outer rotor 22 also rotates.

[0071] According to this embodiment, the bearing holder 70 has a plurality of protruding parts 72 protruding radially outward from the holder main body part 71. The housing main body part 31 has a fixed part 39 to which the bearing holder 70 is fixed, and a frame-shaped part 38 that protrudes from the fixed part 39 to one axial side (+Y side) and surrounds the central axis J. The frame-shaped part 38 has a plurality of first screw fastening parts 38r to which the cover part 33 is fixed with screws 94. The fixed part 39 has a plurality of second screw fastening parts 39r to which the plurality of protruding parts 72 are fixed with screws 92. The plurality of first screw fastening parts 38r and the plurality of second screw fastening parts 39r are arranged to be shifted from each other in the circumferential direction. Therefore, the housing 30 can be prevented from becoming large in the radial direction, compared to a case in which the plurality of first screw fastening parts 38r and the plurality of second screw fastening parts 39r are arranged side by side in the radial direction. This can prevent the rotating electric machine 10 from becoming large in the radial direction. Furthermore, the portion of the bearing holder 70 that is fixed to the second screw fastening portion 39r is the protrusion 72 that protrudes radially outward from the holder main body 71. Therefore, the bearing holder 70 can be fixed to the housing 30 at a position further radially outward. This allows the bearing holder 70 to be firmly and stably fixed to the housing 30 by the screws 92. As described above, according to this embodiment, the bearing holder 70 can be stably fixed to the housing 30 while preventing the rotating electric machine 10 from becoming large in the radial direction.

[0072] According to this embodiment, the first screw fastening portions 38r and the second screw fastening portions 39r are alternately arranged along the circumferential direction when viewed in the axial direction. Therefore, the first screw fastening portions 38r and the second screw fastening portions 39r can be arranged in a well-balanced manner over the entire circumference while being offset from each other in the circumferential direction. This allows the bearing holder 70 and the cover portion 33 to be fixed to the housing 30 more firmly and stably.

[0073] Further, according to this embodiment, each of the first screw fastening portions 38r is arranged circumferentially offset from the center of the second screw fastening portions 39r adjacent to each other in the circumferential direction. Therefore, the first screw fastening portion 38r and the second screw fastening portion 39r can be arranged close to each other in the circumferential direction. This makes it easier to prevent the housing 30 from becoming large in a predetermined direction perpendicular to the axial direction, compared to when the first screw fastening portion 38r is arranged in the center of the second screw fastening portions 39r adjacent to each other in the circumferential direction. Therefore, it is possible to further prevent the rotating electric machine 10 from becoming large in the radial direction. Specifically, in this embodiment, for example, when the first screw fastening portion 38i is arranged in the center of the second screw fastening portion 39a and the second screw fastening portion 39d in the circumferential direction, the first screw fastening portion 38i is located above the apex of the annular fixed portion 39. Therefore, the first screw fastening portion 38i is located higher than in this embodiment, and the housing 30 becomes larger in the vertical direction Z than in this embodiment. In contrast, by disposing the first screw fastening portion 38i offset from the circumferential center between the second screw fastening portion 39a and the second screw fastening portion 39d as in this embodiment, the first screw fastening portion 38i can be positioned further down. This makes it easier to reduce the size of the rotating electric machine 10 in the up-down direction Z. The more the first screw fastening portion 38i is offset from the circumferential center between the second screw fastening portion 39a and the second screw fastening portion 39d, the lower the first screw fastening portion 38i can be disposed, and the more the rotating electric machine 10 can be reduced in size in the up-down direction Z.

[0074] As with the above-described first screw fastening portion 38i, the first screw fastening portion 38j can be positioned higher by being shifted from the center in the circumferential direction between the second screw fastening portion 39b and the second screw fastening portion 39c. This makes it easier to reduce the size of the rotating electric machine 10 in the vertical direction Z. As with the above-described first screw fastening portion 38i, the first screw fastening portion 38k can be positioned higher in the width direction (-X side) by being shifted from the center in the circumferential direction between the second screw fastening portion 39a and the second screw fastening portion 39b. This makes it easier to reduce the size of the rotating electric machine 10 in the width direction X. As with the above-described first screw fastening portion 38i, the first screw fastening portion 38m can be positioned higher in the width direction (+X side) by being shifted from the center in the circumferential direction between the second screw fastening portion 39c and the second screw fastening portion 39d. Therefore, the rotating electrical machine 10 can be more easily made compact in the width direction X.

[0075] According to the present embodiment, the first screw fastening portion 38r has an inner portion 38p that protrudes radially inward from the radial inner side surface of the frame-shaped portion 38. Therefore, the first screw fastening portion 38r can be arranged closer to the radial inner side, and the frame-shaped portion 38 can be prevented from becoming larger in the radial direction. The protruding portion 72 is arranged facing the inner portion 38p in the circumferential direction. Therefore, compared to a case in which the protruding portion 72 and the first screw fastening portion 38r are arranged with a radial deviation, the rotating electric machine 10 can be prevented from becoming larger in the radial direction. Furthermore, the portion of the protruding portion 72 that faces the inner portion 38p in the circumferential direction has a shape that follows the side surface of the inner portion 38p in the circumferential direction. Therefore, the protruding portion 72 and the inner portion 38p can be arranged closer to each other in the circumferential direction. This allows the first screw fastening portion 38r and the second screw fastening portion 39r to be arranged closer to each other in the circumferential direction. Therefore, the first screw fastening portions 38r can be arranged more circumferentially offset from the center between the circumferentially adjacent second screw fastening portions 39r. Therefore, the first screw fastening portions 38i, 38j can be arranged more circumferentially offset from the center between the circumferentially adjacent second screw fastening portions 39r, and the rotating electric machine 10 can be more suitably downsized in the up-down direction Z. The first screw fastening portions 38k, 38m can be arranged more suitably offset in the circumferential direction from the center between the circumferentially adjacent second screw fastening portions 39r, and the rotating electric machine 10 can be more suitably downsized in the width direction X.

[0076] According to the present embodiment, the frame-shaped portion 38 has a pair of first side portions 38a, 38b, a pair of second side portions 38c, 38d, and four connection portions 38e, 38f, 38g, 38h. The first screw fastening portion 38r is provided on each of the pair of first side portions 38a, 38b and the pair of second side portions 38c, 38d. The second screw fastening portion 39r is provided on each of the four connection portions 38e, 38f, 38g, 38h in the axial direction. In this manner, the frame-shaped portion 38 is formed in a substantially rectangular shape, and the second screw fastening portion 39r is provided on each of the radially inner sides of the connection portions 38e, 38f, 38g, 38h in the axial direction, so that the second screw fastening portions 39r can be arranged on the diagonal lines of the frame-shaped portion 38. This allows the second screw fastening portions 39r to be disposed further outward in the radial direction while preventing the frame-shaped portion 38 from becoming larger in the up-down direction Z and the width direction X. This allows the bearing holder 70 to be more stably fixed to the housing 30 while further preventing the rotating electric machine 10 from becoming larger in the radial direction. Furthermore, by providing one first screw fastening portion 38r on each side of the frame-shaped portion 38, the cover portion 33 can be more firmly and stably fixed to the frame-shaped portion 38.

[0077] According to this embodiment, the first screw fastening portion 38i provided on one of the pair of first side portions 38a, 38b and the first screw fastening portion 38j provided on the other of the pair of first side portions 38a, 38b are arranged to be shifted from each other in the width direction X. Therefore, compared to a case where the first screw fastening portion 38i and the first screw fastening portion 38j are at the same position in the width direction X, the cover portion 33 can be fixed more stably in the width direction X to the pair of first side portions 38a, 38b. According to this embodiment, the first screw fastening portion 38k provided on one of the pair of second side portions 38c, 38d and the first screw fastening portion 38m provided on the other of the pair of second side portions 38c, 38d are arranged to be shifted from each other in the up-down direction Z. Therefore, compared to a case where the first screw fastening portion 38k and the first screw fastening portion 38m are at the same position in the vertical direction Z, the cover portion 33 can be fixed more stably to the pair of second side portions 38c, 38d in the vertical direction Z. Also, since each first screw fastening portion 38r can be disposed circumferentially offset from the center between the second screw fastening portions 39r adjacent to each other in the vertical direction, it is easy to reduce the size of the rotating electric machine 10 in the vertical direction Z and the width direction X, as described above.

[0078] Moreover, according to this embodiment, the arrangement of the multiple first screw fastening portions 38r is rotationally symmetric about the central axis J. Therefore, the cover portion 33 can be screwed and fixed to the frame-shaped portion 38 in a circumferentially balanced manner. Moreover, according to this embodiment, the arrangement of the multiple second screw fastening portions 39r is rotationally symmetric about the central axis J. Therefore, the bearing holder 70 can be screwed and fixed to the fixed portion 39 in a circumferentially balanced manner. As a result, the cover portion 33 and the bearing holder 70 can be fixed to the housing main body portion 31 more firmly and stably.

[0079] <Second embodiment> In the following description, configurations similar to those in the first embodiment described above may be appropriately denoted by the same reference numerals and description thereof may be omitted.

[0080] As shown in Fig. 5, the frame-shaped portion 238 of the rotating electric machine 210 in the pump 200 of this embodiment is a substantially square frame having a pair of first side portions 238a, 238b extending along the width direction X and spaced apart from each other in the vertical direction Z with the central axis J therebetween, and a pair of second side portions 238c, 238d extending in the vertical direction Z and spaced apart from each other in the width direction X with the central axis J therebetween. Each of the pair of first side portions 238a, 238b and the pair of second side portions 238c, 238d has a bent portion 238s that is partially bent and protrudes radially outward. The bent portion 238s is a semicircular arc that protrudes radially outward. The bent portion 238s is provided at the center of each side portion.

[0081] In this embodiment, the first screw fastening portion 238r includes a first screw fastening portion 238e, a first screw fastening portion 238f, a first screw fastening portion 238g, and a first screw fastening portion 238h as four connecting portions respectively connecting the ends of the first side portions 238a and 238b in the width direction X and the ends of the second side portions 238c and 238d in the up-down direction Z. The first screw fastening portion 238e connects the end of the first side portion 238a on one side in the width direction (+X side) and the end of the upper side of the second side portion 238c. The first screw fastening portion 238f connects the end of the first side portion 238b on one side in the width direction and the end of the lower side of the second side portion 238c. The first screw fastening portion 238g connects the end of the first side portion 238b on the other side in the width direction (-X side) and the end of the lower side of the second side portion 238d. The first screw fastening portion 238h connects the end portion on the other width direction side of the first side portion 238a and the upper end portion of the second side portion 238d.

[0082] The first screw fastening portion 238r has a circular shape when viewed in the axial direction. A female screw hole 38n is provided in the center of the first screw fastening portion 238r when viewed in the axial direction. The first screw fastening portion 238r protrudes radially on both sides beyond each side. The radial position of the radial outer edge of the first screw fastening portion 238r is the same as the radial position of the radial outer edge of the bent portion 238s, for example.

[0083] In the fixed portion 239 of this embodiment, the second screw fastening portion 239r is provided at the center between the first screw fastening portions 238r adjacent to each other in the circumferential direction. The radially outer portion of each second screw fastening portion 239r is located inside the bent portion 238s provided on each side portion when viewed in the axial direction. Four second screw fastening portions 239r are provided, namely, the second screw fastening portion 239a, the second screw fastening portion 239b, the second screw fastening portion 239c, and the second screw fastening portion 239d. The second screw fastening portion 239a is located at the center in the width direction X between the first screw fastening portion 238e and the first screw fastening portion 238h. The second screw fastening portion 239b is located at the center in the up-down direction Z between the first screw fastening portion 238e and the first screw fastening portion 238f. The second screw fastening portion 239c is located at the center between the first screw fastening portion 238f and the first screw fastening portion 238g in the width direction X. The second screw fastening portion 239d is located at the center between the first screw fastening portion 238g and the first screw fastening portion 238h in the up-down direction Z.

[0084] The protrusion 272 in the bearing holder 270 includes four protrusions 272a, 272b, 272c, and 272d fixed to the four second screw fastening portions 239a, 239b, 239c, and 239d by screws 292, respectively. The protrusion 272a protrudes upward from the holder main body 71 and is fixed to the second screw fastening portion 239a. The protrusion 272b protrudes from the holder main body 71 to one side in the width direction (+X side) and is fixed to the second screw fastening portion 239b. The protrusion 272c protrudes downward from the holder main body 71 and is fixed to the second screw fastening portion 239c. The protrusion 272d protrudes from the holder main body 71 to the other side in the width direction (-X side) and is fixed to the second screw fastening portion 239d.

[0085] The positions in the width direction X of the second screw fastening portion 239a and the protruding portion 272a are the same as the positions in the width direction X of the second screw fastening portion 239c and the protruding portion 272c. The positions in the up-down direction Z of the second screw fastening portion 239b and the protruding portion 272b are the same as the positions in the up-down direction Z of the second screw fastening portion 239d and the protruding portion 272d. The shapes of the second screw fastening portions 239r are each symmetrical in the circumferential direction. The shapes of the protruding portions 272 are each symmetrical in the circumferential direction. The other configurations of the rotating electric machine 210 can be the same as the other configurations of the rotating electric machine 10 of the first embodiment. The other configurations of the pump 200 can be the same as the other configurations of the pump 100 of the first embodiment.

[0086] In this embodiment as well, the multiple first screw fastening portions 238r and the multiple second screw fastening portions 239r are circumferentially offset from each other, and therefore, as in the first embodiment described above, the bearing holder 270 can be stably fixed to the housing 230 while preventing the rotating electric machine 210 from becoming larger in the radial direction.

[0087] 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 multiple first screw fastening portions and the multiple second screw fastening portions may be arranged in any manner as long as they are offset from each other in the circumferential direction. The first screw fastening portions and the second screw fastening portions do not have to be arranged alternately along the circumferential direction when viewed in the axial direction. The number of the first screw fastening portions and the number of the second screw fastening portions are not particularly limited as long as they are each two or more, and may be different from each other.

[0088] The multiple first screw fastening portions may be arranged with rotational symmetry other than four-fold symmetry around the central axis. The multiple first screw fastening portions may be arranged with N-fold symmetry around the central axis, where N is an integer equal to or greater than 2. The multiple first screw fastening portions do not have to be arranged with rotational symmetry around the central axis. The same applies to the multiple second screw fastening portions.

[0089] The shape of the frame-shaped portion is not particularly limited. The frame-shaped portion may be a circular frame-shaped portion or a polygonal frame-shaped portion other than a square. The shape of the protruding portion of the bearing holder is not particularly limited. When the inner edge of the inner portion of the first screw fastening portion is curved as viewed in the axial direction, the shape of the portion of the protruding portion facing the inner portion may be curved along the inner edge of the inner portion. The holder main body of the bearing holder may not have a flange portion. In this case, the protruding portion may protrude radially outward from the retaining tube portion.

[0090] 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 use of the pump including the 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]

[0091] 10,210... rotating electric machine, 20... pump mechanism, 30,230... housing, 31... housing main body, 33... lid, 38i,38j,38k,38m,38r,238e,238f,238g,238h,238r... first screw fastening portion, 39a,39b,39c,39d,39r,239a,239b,239c,239d,239r... second screw fastening portion, 35a... opening, 38,238... frame-shaped portion, 38a,38b,238a,238b... first side portion, 38c,38d,2 38c, 238d... second side portion, 38e, 38f, 38g, 38h... connection portion, 38p... inner portion, 39, 239... fixed portion, 41... rotor, 42... stator, 43a... bearing, 70, 270... bearing holder, 71... holder main body portion, 72, 72a, 72b, 72c, 72d, 272, 272a, 272b, 272c, 272d... protruding portion, 92, 93, 94, 292... screw, 100, 200... pump, J... center axis, X... width direction (first direction), Z... up-down direction (second direction)

Claims

1. a rotor rotatable about a central axis extending in an axial direction; a stator facing the rotor with a gap therebetween; a housing that accommodates the rotor and the stator therein; a bearing that rotatably supports the rotor; a bearing holder that holds the bearing and is fixed to the housing; Equipped with The bearing holder includes: A holder body portion for holding the bearing; A plurality of protrusions protruding radially outward from the holder body; having The housing includes: a housing body having an opening that opens to one axial side and accommodates the rotor and the stator therein; a cover portion fixed to one axial side of the housing body portion and closing the opening portion; having The housing body portion includes: a fixed portion to which the bearing holder is fixed; a frame-shaped portion that protrudes from the fixed portion to one axial direction and surrounds the central axis; having The opening is provided in the frame-shaped portion, the frame-shaped portion has a plurality of first screw fastening portions to which the lid portion is fixed with screws, the fixed portion has a plurality of second screw fastening portions to which the plurality of protruding portions are respectively fixed with screws, The first screw fastening portions and the second screw fastening portions are arranged to be shifted from each other in a circumferential direction, The first screw fastening portions are arranged at intervals from one another along a circumferential direction, The second screw fastening portions are arranged at intervals from one another along a circumferential direction, The first screw fastening portions and the second screw fastening portions are arranged alternately along a circumferential direction when viewed in the axial direction.

2. The rotating electric machine according to claim 1 , wherein each of the first screw fastening portions is disposed circumferentially offset from a center of each of the second screw fastening portions adjacent to each other in the circumferential direction.

3. The first screw fastening portion has an inner portion that protrudes radially inward on a radially inner surface of the frame-shaped portion, The protruding portion is disposed opposite the inner portion in a circumferential direction, The rotating electric machine according to claim 2 , wherein a portion of the protruding portion that faces the inner portion in the circumferential direction has a shape that follows a side surface of the inner portion in the circumferential direction.

4. The frame portion is a pair of first side portions extending along a first direction perpendicular to the axial direction and arranged at an interval on either side of the central axis in a second direction perpendicular to both the axial direction and the first direction; a pair of second side portions extending along the second direction and arranged at an interval between the central axis in the first direction; four connection portions respectively connecting ends of the first side portions in the first direction to ends of the second side portions in the second direction; having The first screw fastening portions are provided on each of the pair of first side portions and the pair of second side portions, The rotating electric machine according to claim 1 , wherein the second screw fastening portions are provided on respective radially inner sides of the four connection portions as viewed in the axial direction.

5. the first screw fastening portion provided on one of the pair of first side portions and the first screw fastening portion provided on the other of the pair of first side portions are arranged to be shifted from each other in the first direction, The rotating electric machine according to claim 4 , wherein the first screw fastening portion provided on one of the pair of second side portions and the first screw fastening portion provided on the other of the pair of second side portions are arranged offset from each other in the second direction.

6. The first screw fastening portions are arranged in a rotationally symmetrical manner around the central axis, The rotating electric machine according to claim 1 , wherein the second screw fastening portions are arranged in a rotationally symmetrical manner about the central axis.

7. A rotating electric machine according to any one of claims 1 to 6, a pump mechanism connected to the rotor; A pump comprising:

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