Electric pump

Abstract

To provide an electric pump which can inhibit rattling of a fixed portion.SOLUTION: An electric pump includes: a first housing which houses a rotor and a stator and is open to one side in an axial direction; a second housing which houses a substrate and covers a housing end of the first housing from the one side in the axial direction; and an annular restraint member. The first housing has a connected part provided on an outer peripheral surface of the first housing. The second housing has a housing main part and a connecting part located at the other side in the axial direction relative to the housing main part. Elastic pieces of the connecting part can elastically deform in a radial direction and is connected to the connected part from the radial outer side. The restraint member has: a ring-shaped part which covers the multiple elastic pieces from the radial outer side; a protruding part which protrudes from an end at the other side in the axial direction of the ring-shaped part to the radial inner side and is butted with a first end at the other side in the axial direction of the connecting part from the other side in the axial direction; and a movement restraint part which is provided at the ring-shaped part and restraints movement of the ring-shaped part to the other side in the axial direction relative to the connecting part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] A configuration in which the base and cover of an electric motor are connected by fitting is known. For example, Patent Document 1 discloses a configuration including a base-side fitting portion having a convex portion provided on the base and a cover-side fitting portion having an elastically deformable resilient piece provided on the cover. In this configuration, the base and cover are connected by a so-called snap-fit ​​structure in which the resilient piece of the cover-side fitting portion fits into the convex portion of the base-side fitting portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 224720 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described configuration, when an external force is applied or due to vibration or the like, there is a risk that rattle may occur in the fitting of the snap-fit ​​structure between the elastic piece and the protrusion.

[0005] In view of the above circumstances, one object of the present invention is to provide an electric pump that can suppress rattle of a fixed portion. [Means for solving the problem]

[0006] One aspect of the electric pump of the present invention includes a rotor rotatable about a central axis, a stator facing the rotor with a gap therebetween, a first housing that houses the rotor and the stator and opens to one axial side, a second housing that houses a board electrically connected to the stator and covers one axial end of the first housing from that axial side, and an annular restraining member that extends circumferentially around the central axis. The first housing has a connected portion provided on an outer circumferential surface of the first housing. The second housing has a housing main body and a connecting portion located on the other axial side of the housing main body. The connecting portion has a plurality of elastic pieces arranged circumferentially. The elastic pieces are elastically deformable in the radial direction and are connected to the connected portion from the radial outside. The restraining member has a ring-shaped portion that covers the multiple elastic pieces from the radially outer side, a protruding portion that protrudes radially inward from the other axial end of the ring-shaped portion and abuts against a first end on the other axial side of the connecting portion from the other axial side, and a movement restraining portion that is provided on the ring-shaped portion and restricts movement of the ring-shaped portion toward the other axial side relative to the connecting portion. [Effects of the Invention]

[0007] According to one aspect of the present invention, there is provided an electric pump that can suppress rattle of a fixed portion. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of an electric pump according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the electric pump according to one embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along the central axis of the electric pump according to the embodiment. [Figure 4] FIG. 4 is a perspective view showing a first housing of the electric pump of the embodiment. [Figure 5] FIG. 5 is a perspective view of the electric pump of the embodiment with the restraining member removed. [Figure 6]FIG. 6 is a perspective view showing a second housing of the electric pump of the embodiment. [Figure 7] FIG. 7 is a perspective view showing a restraining member of the electric pump according to one embodiment. [Figure 8] FIG. 8 is a diagram showing a state in which the restraining member is set in advance in the first housing when assembling the electric pump of the embodiment. [Figure 9] FIG. 9 is a view showing a state in which the second housing is placed over the first housing when assembling the electric pump of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Fig. 1 is a front view of an electric pump 100 of this embodiment. Fig. 2 is a perspective view of the electric pump 100 of this embodiment. Fig. 3 is a cross-sectional view taken along the central axis J of the electric pump 100 of this embodiment.

[0010] In each drawing, a central axis J of the electric pump in the following embodiments is shown as appropriate. The central axis J is a virtual axis. In the following description, the direction in which the central axis J extends, i.e., the axial direction of the central axis J, will be simply referred to as the "axial direction," the radial direction centered on the central axis J will be simply referred to as the "radial direction," and the circumferential direction centered on the central axis J will be simply referred to as the "circumferential direction." In each drawing, a Z axis parallel to the axial direction is shown. In the following description, the side in the axial direction toward which the arrow of the Z axis points (+Z side) will be referred to as the "upper side," and the side opposite to the side toward which the arrow of the Z axis points (-Z side) will be referred to as the "lower side." In the following embodiments, the upper side corresponds to "one axial side," and the lower side corresponds to "the other axial side." Note that the terms "upper side" and "lower side" are merely names used to describe the relative positions of the components, and the actual relative positions may be different from those indicated by these names.

[0011] The electric pump 100 of this embodiment shown in FIGS. 1 to 3 is mounted on, for example, a vehicle. The fluid pumped by the electric pump 100 is, for example, oil. The fluid pumped by the electric pump 100 is not particularly limited, and may be a fluid other than oil, such as water. The electric pump 100 mainly includes a rotating electric machine 10, a pump mechanism 20, and a housing 50.

[0012] 3, the rotating electric machine 10 includes a rotor 11, a stator 12, and a substrate 15. That is, the electric pump 100 includes the rotor 11, the stator 12, and the substrate 15.

[0013] The rotor 11 is rotatable about a central axis J. The rotor 11 includes a shaft 11s and a rotor core 11c. The shaft 11s extends in the axial direction. The shaft 11s is supported by a first housing 51 (described below) so as to be rotatable about the central axis. The rotor core 11c is fixed to the outer peripheral surface of the upper axial end of the shaft 11s. The rotor core 11c holds a plurality of magnets (not shown). The lower end of the shaft 11s is connected to the inner rotor 21.

[0014] The stator 12 faces the rotor 11 with a gap therebetween. The stator 12 is located radially outside the rotor 11. The stator 12 is annular and surrounds the rotor 11. The stator 12 has a stator core (not shown) and a plurality of coils 12c attached to the stator core via insulators (not shown).

[0015] The substrate 15 is electrically connected to the stator 12. The substrate 15 is a printed circuit board on which a wiring pattern (not shown) is provided. The substrate 15 is provided with an inverter circuit (not shown) that supplies power to the stator 12. The inverter circuit supplies current to the coil 12c. This causes the rotor 11 to rotate, driving the pump mechanism 20 (described later).

[0016] The pump mechanism 20 is driven by the rotating electric machine 10 to pump fluid. The pump mechanism 20 is housed in a pump chamber 52p provided in a first housing 51, which will be described later. The pump mechanism 20 has an inner rotor 21 and an outer rotor 22. The inner rotor 21 is fixed to the outer peripheral surface of the lower end of the shaft 11s. The inner rotor 21 is driven to rotate around the central axis J together with the shaft 11s of the rotor 11 by the rotating electric machine 10. The outer rotor 22 is provided radially outside the inner rotor 21 and meshes with the inner rotor 21.

[0017] The housing 50 accommodates the pump mechanism 20, the rotor 11, the stator 12, and the substrate 15. The housing 50 includes a first housing 51, a second housing 52, and a restraining member .

[0018] FIG. 4 is a perspective view showing the first housing 51 of the electric pump 100 of this embodiment. The first housing 51 accommodates the pump mechanism 20, the rotor 11, and the stator 12. The first housing 51 is made of metal. As shown in FIGS. 1 to 4, the first housing 51 is cylindrical and opens upward. The first housing 51 has a first housing main body 51a and an attachment portion 51b.

[0019] The first housing body 51a has a generally cylindrical shape that is open upward and is centered on a central axis J. As shown in Fig. 3, the first housing body 51a has a stator accommodating portion 51c and a pump mechanism accommodating portion 51d.

[0020] The stator accommodating portion 51c is generally cylindrical and has an upward opening, centered on the central axis J. The stator accommodating portion 51c accommodates the stator 12. The outer peripheral surface of a stator core (not shown) is fixed to the inner peripheral surface of the stator accommodating portion 51c. The stator accommodating portion 51c has a bottom wall portion 51h located below. The shaft 11s passes through the bottom wall portion 51h in the axial direction.

[0021] The pump mechanism-accommodating portion 51d extends downward from the stator-accommodating portion 51c. The pump mechanism-accommodating portion 51d is recessed upward from the lower surface of the first housing main body portion 51a. The lower end of the shaft 11s and the inner rotor 21 are accommodated in the pump mechanism-accommodating portion 51d.

[0022] A pump cover (not shown) is attached to the lower side of the first housing main body 51a. The pump cover (not shown) covers at least a portion of the lower opening of the pump mechanism accommodating portion 51d. The pump mechanism accommodating portion 51d and the pump cover (not shown) form a pump chamber 52p that accommodates the pump mechanism 20 therein.

[0023] As shown in FIG. 4, the mounting portion 51b protrudes radially outward from the lower end of the first housing main body portion 51a. The mounting portion 51b and the stator accommodating portion 51c are part of the same single member. A plurality of mounting portions 51b are provided at intervals in the circumferential direction. In this embodiment, a pair of mounting portions 51b are provided, with the central axis J sandwiched between them in the radial direction. The mounting portion 51b has a mounting hole 51f that penetrates the mounting portion 51b in the axial direction. The electric pump 100 is fixed to an apparatus by fastening a bolt passed through the mounting hole 51f of the mounting portion 51b to the housing of the apparatus.

[0024] A coupled portion 53 is provided on the outer peripheral surface facing radially outward of the upper housing end 51s of the first housing main body 51a. That is, the first housing 51 has the coupled portion 53. In this embodiment, the coupled portion 53 is recessed radially inward from the outer peripheral surface of the housing end 51s and has a groove 53m that continues in the circumferential direction. The coupled portion 53 has a tapered portion 53t whose outer diameter gradually decreases from the bottom to the top. The groove 53m is provided on the bottom side of the tapered portion 53t.

[0025] The second housing 52 is fixed to the upper side of the first housing 51. The second housing 52 covers the housing end 51s of the first housing 51 from above. The second housing 52 closes the opening on the upper side of the first housing 51. The second housing 52 has insulating properties. In this embodiment, the second housing 52 is made of resin. The second housing 52 accommodates the substrate 15.

[0026] Fig. 5 is a perspective view showing the electric pump 100 of this embodiment with the restraining member 70 removed. Fig. 6 is a perspective view showing the second housing 52 of the electric pump 100 of this embodiment.

[0027] As shown in FIGS. 3, 5, and 6, the second housing 52 has a housing main body 52a, a lid portion 52c, and a plurality of connecting portions 55.

[0028] The housing body 52a has a cylindrical shape surrounding the central axis J. More specifically, the housing body 52a has a generally cylindrical shape extending in the up-down direction around the central axis J. As shown in FIG. 3, the substrate 15 is disposed radially inside the housing body 52a. The lid portion 52c closes the upper opening of the housing body 52a. As shown in FIG. 5, the lid portion 52c is fixed to the upper end of the housing body 52a with a plurality of screws 52d.

[0029] As shown in Figures 5 and 6, the housing main body 52a is provided with a connector portion 52e. The connector portion 52e protrudes radially outward from the housing main body 52a. Although not shown, the connector portion 52e holds a plurality of terminals. The plurality of terminals are electrically connected to the board 15. A connector of an external device is connected to the connector portion 52e.

[0030] 3, an end face 52f is provided at the lower end of the housing body 52a. The end face 52f extends radially outward from an inner circumferential surface 52g of the housing body 52a. The end face 52f is an annular downward surface that surrounds the central axis J.

[0031] With the second housing 52 fixed to the upper side of the first housing 51, the outer peripheral edge of the holding member 59 is sandwiched between the end face 52f and the housing end 51s of the first housing. The holding member 59 is substantially disk-shaped (annular) and has its center on the central axis J. In this embodiment, the holding member 59 holds connection terminals, bus bars (not shown), and the like that connect the stator 12 and the substrate 15. The holding member 59 is made by insert molding using the connection terminals, bus bars, and the like as insert members.

[0032] As shown in FIGS. 3 and 6 , the connecting portion 55 extends downward continuously from the housing main body 52a. The connecting portion 55 has a generally cylindrical shape centered on the central axis J and extending in the up-down direction. The connecting portion 55 is provided at the lower end of the second housing 52. The inner diameter of the connecting portion 55 is slightly larger than the outer diameter of the upper housing end 51s of the first housing 51. When the second housing 52 is fixed to the upper side of the first housing 51, the connecting portion 55 is located radially outward of the upper housing end 51s of the first housing 51. In other words, the upper housing end 51s of the first housing 51 is inserted inside the connecting portion 55 provided at the lower end of the second housing 52.

[0033] As shown in FIGS. 5 and 6 , the connecting portion 55 has an annular portion 55c and a plurality of elastic pieces 56 arranged in the circumferential direction. The annular portion 55c is provided at the upper end of the connecting portion 55. The annular portion 55c has a circular ring shape extending in the circumferential direction. In this embodiment, the connecting portion 55 has, for example, 12 elastic pieces 56. Each elastic piece 56 extends downward from the annular portion 55c. In other words, the annular portion 55c connects the upper base ends 56b of the plurality of elastic pieces 56 to each other.

[0034] Each elastic piece 56 extends from the housing main body 52a toward the other axial direction. Each elastic piece 56 has a base end 56b connected to the housing main body 52a, and a lower tip end 56s thereof is elastically deformable in the radial direction. Each elastic piece 56 is provided such that its circumferential width gradually decreases from top to bottom.

[0035] A claw portion 56t that protrudes radially inward is provided on a lower tip portion 56s of each elastic piece 56. As shown in FIGS. 3 and 5, the claw portion 56t of each elastic piece 56 is caught in a groove 53m of the connected portion 53 of the first housing 51. That is, the elastic piece 56 is elastically deformable in the radial direction and is connected to the connected portion 53 from the radially outer side. The second housing 52 overlaps with the housing end portion 51s of the first housing 51 in the radial direction at the multiple elastic pieces 56.

[0036] A notch 55k is provided between circumferentially adjacent elastic pieces 56. The notch 55k extends upward from a first end 55s on the lower side of the connecting portion 55. Therefore, the notch 55k opens downward.

[0037] 5 and 6, the connecting portion 55 has a plurality of recesses 57 spaced apart in the circumferential direction at the upper second end portion 55t. The connecting portion 55 of this embodiment has, for example, six recesses 57. Each recess 57 is recessed radially inward from the outer circumferential surface of the annular portion 55c of the connecting portion 55. The recesses 57 extend in the vertical direction.

[0038] The housing body 52a is also provided with a plurality of lightening recesses 52k, each located above the recess 57. The lightening recesses 52k are recessed radially inward from the outer circumferential surface of the housing body 52a. The plurality of lightening recesses 52k are arranged side by side in the circumferential direction. The recesses 57 open upward at a second end 55t on the upper side of the connecting portion 55 and communicate with the inside of the lightening recesses 52k.

[0039] Each recess 57 is provided at a position overlapping with an elastic piece 56 in the circumferential direction. In other words, each recess 57 is provided between adjacent notches 55k in the circumferential direction. The lower end of each recess 57 is provided at a position overlapping with a notch 55k in the axial direction. Each recess 57 has a pair of inclined surfaces 57s on both sides in the circumferential direction so that the circumferential width gradually increases from the radially inner side to the outer side. Each recess 57 is provided so that the circumferential width gradually increases from the bottom side to the top side.

[0040] 1 to 3, the restraining member 70 is provided radially outside the portion where the first housing 51 and the second housing 52 overlap in the radial direction. As shown in FIG. 3, the restraining member 70 is provided radially outside the first housing 51 and the second housing 52. Therefore, the inner diameter of the restraining member 70 is larger than the outer diameter of the housing end portion 51s of the first housing 51 and the connecting portion 55 of the second housing 52. The restraining member 70 is annular (cylindrical) and extends circumferentially around the central axis J.

[0041] FIG. 7 is a perspective view showing the restraining member 70 of the electric pump 100 of this embodiment. As shown in Figures 3 and 7, the restraining member 70 includes a ring-shaped portion 71, a protruding portion 72, and a movement restraining portion 73. The ring-shaped portion 71 is generally cylindrical and extends in the vertical direction about the central axis J. The ring-shaped portion 71 covers the multiple elastic pieces 56 from the radially outer side while the second housing 52 is fixed to the upper side of the first housing 51. The ring-shaped portion 71 restrains the multiple elastic pieces 56 and limits the radially outward deformation of the elastic pieces 56.

[0042] The protrusion 72 protrudes radially inward from the lower end of the ring-shaped portion 71. The protrusion 72 extends downward from the lower end of the ring-shaped portion 71 at an inclination radially inward. In this embodiment, the protrusion 72 is provided continuously in the circumferential direction. Note that a plurality of protrusions 72 may be provided at intervals in the circumferential direction. The protrusion 72 abuts from below against the first end 55s on the lower side of the connecting portion 55 of the second housing 52. This restricts the upward movement of the restraining member 70.

[0043] The movement restraint portion 73 is provided on the ring-shaped portion 71. The movement restraint portion 73 in this embodiment has a crimped protrusion 73t that protrudes radially inward from the inner circumferential surface of the ring-shaped portion 71. A plurality of crimped protrusions 73t (e.g., six) are provided at intervals in the circumferential direction. The crimped protrusions 73t are provided by pressing the outer circumferential surface of the ring-shaped portion 71 radially inward with a tool such as a punch, thereby plastically deforming the ring-shaped portion 71. The crimped protrusions 73t are inserted into the recessed portion 57 of the connecting portion 55 of the second housing 52. As a result, the crimped protrusions 73t catch on the inner surface of the recessed portion 57, restricting circumferential and downward movement of the ring-shaped portion 71 relative to the connecting portion 55.

[0044] Fig. 8 is a diagram showing a state in which the restraining member 70 is set in advance on the first housing 51 when assembling the electric pump 100 of this embodiment. Fig. 9 is a diagram showing a state in which the second housing 52 is placed over the top of the first housing 51 when assembling the electric pump 100 of this embodiment.

[0045] As shown in FIG. 8, to assemble the electric pump 100, first, the rotor 11, the stator 12, and the pump mechanism 20 are installed in the first housing 51. Next, the holding member 59 is placed in the opening on the upper side of the first housing 51. The substrate 15 is attached to the holding member 59 with screws or the like via a spacer (not shown). In addition, the restraining member 70 is disposed on the radially outer side of the first housing 51. Note that the restraining member 70 does not have the crimping protrusions 73t formed thereon.

[0046] 9, the second housing 52 is then placed over the top of the first housing 51. At this time, a holding member 59 is sandwiched between an end surface 52f of the second housing 52 and the housing end portion 51s of the first housing. Furthermore, the claw portions 56t of the multiple elastic pieces 56 of the connecting portion 55 of the second housing 52 are hooked into the grooves 53m of the connected portion 53 of the first housing 51. This fixes the second housing 52 to the top of the first housing 51.

[0047] Next, as shown in FIG. 3 , the restraining member 70 is moved upward, so that the ring-shaped portion 71 covers the multiple elastic pieces 56 from the radially outer side. The restraining member 70 is moved until the protruding portion 72 abuts against the first end 55s of the connecting portion 55 of the second housing 52 from below. Then, using an appropriate processing machine, multiple crimping protrusions 73t are formed on the ring-shaped portion 71. Each crimping protrusion 73t is inserted into the recess 57 of the connecting portion 55 of the second housing 52 by pressing the outer circumferential surface of the ring-shaped portion 71 radially inward with a tool such as a punch to plastically deform the ring-shaped portion 71. This restricts circumferential and downward movement of the ring-shaped portion 71 relative to the connecting portion 55. In this way, circumferential and axial movement of the restraining member 70 relative to the second housing 52 is restricted.

[0048] The electric pump 100 of this embodiment includes an annular restraining member 70 extending circumferentially about the central axis J. The first housing 51 has a connected portion 53 provided on its outer circumferential surface. The second housing 52 has a housing main body 52a and a connecting portion 55 located on the other axial side of the housing main body 52a. The connecting portion 55 has multiple elastic pieces 56 connectable to the connected portion 53. The restraining member 70 has a ring-shaped portion 71, a protruding portion 72, and a movement restraining portion 73. The ring-shaped portion 71 covers the multiple elastic pieces 56 from the radially outer side. As a result, the ring-shaped portion 71 has the ring-shaped portion 71 that limits radially outward deformation of the multiple elastic pieces 56. The protruding portion 72 abuts against a first end portion 55s on the other axial side of the connecting portion 55. As a result, the protruding portion 72 limits movement of the restraining member 70 in one axial direction relative to the second housing 52. The movement restraining portion 73 is provided on the ring-shaped portion 71. The movement restraining portion 73 includes a movement restraining portion 73 that restricts movement of the ring-shaped portion 71 relative to the connecting portion 55 to the other axial side.

[0049] According to the electric pump 100 of this embodiment, the ring-shaped portion 71 of the restraining member 70 covers the multiple elastic pieces 56 from the radially outer side. This prevents the multiple elastic pieces 56 from being inadvertently released from the connection between the connected portion 53 of the first housing 51 due to external force, vibration, or the like, and prevents rattling due to vibration.

[0050] Furthermore, the restraining member 70 of this embodiment is restricted from moving toward one axial side by the protruding portion 72 abutting against the first end 55s on the other axial side of the connecting portion 55 from the other axial side. That is, the restraining member 70 of this embodiment restricts movement toward one axial side relative to the first housing 51 by utilizing the first end 55s of the protruding portion 72. Therefore, there is no need to provide the second housing 52 with a separate portion that extends radially outward in order to restrict movement of the restraining member 70 toward one axial side relative to the first housing 51. Therefore, according to this embodiment, it is possible to prevent the second housing 52 from becoming too large in the radial direction.

[0051] Furthermore, according to the present embodiment, when the protruding portion 72 abuts against the first end portion 55s on the other axial side of the connecting portion 55 from the other axial side, the movement restraining portion 73 restricts movement of the ring-shaped portion 71 toward the other axial side relative to the connecting portion 55. This suppresses misalignment of the movement restraining portion 73 in the axial direction.

[0052] In this embodiment, the connecting portion 55 has a recess 57 recessed radially inward from the outer circumferential surface of the connecting portion 55. The movement restricting portion 73 also has a crimped protrusion 73t that protrudes radially inward from the inner circumferential surface of the ring-shaped portion 71 and is inserted into the recess 57. According to this embodiment, by forming the crimped protrusion 73t and inserting it into the recess 57 with the protrusion 72 abutting against the first end 55s from the other axial side, it is possible to restrict circumferential and downward movement of the restricting member 70 relative to the connecting portion 55. This simplifies the process of attaching the restricting member 70 to the second housing 52.

[0053] In the present embodiment, the recess 57 is provided at a position that overlaps the elastic piece 56 in the circumferential direction. According to the present embodiment, the elastic piece 56 and the connecting portion 55 that includes the crimping protrusion 73t inserted into the recess 57 can be made smaller in size in the axial direction.

[0054] In this embodiment, the connecting portion 55 has a plurality of notches 55k extending from the first end 55s of the connecting portion 55 to one side in the axial direction. The notches 55k are located between adjacent elastic pieces 56 in the circumferential direction. At least a portion (the lower end in this embodiment) of the recess 57 is provided at a position overlapping with the notches 55k in the axial direction. According to this embodiment, the second housing 52 can be made smaller in the axial direction than when the recess 57 and the notch 55k are arranged offset from each other in the axial direction, thereby providing an electric pump 100 that is made smaller in the axial direction.

[0055] In this embodiment, the recess 57 opens to one axial side at the second end 55t on one axial side of the connecting portion 55. According to this embodiment, with the restraining member 70 disposed on the outer periphery of the second housing, the position of the recess 57 can be easily seen by observing the gap between the restraining member 70 and the second housing from above from one axial side. This makes it possible to easily form the crimping protrusion 73t in accordance with the position of the recess 57.

[0056] Although one embodiment of the present invention has been described above, the configurations and combinations thereof in the embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiment.

[0057] For example, in the present embodiment, groove 53m is provided as coupled portion 53, and protrusion 72 is provided on coupling portion 55 for coupled portion 53, but this is not limiting. For example, a protrusion (not shown) that protrudes radially outward from the outer circumferential surface of first housing 51 may be provided as coupled portion 53, and a recess, hole, or the like that can be coupled to the protrusion may be provided on coupling portion 55.

[0058] Furthermore, in this embodiment, the movement restraint portion 73 has the crimped protrusion 73t that is inserted into the recess 57. However, instead of the crimped protrusion 73t, a screw or the like may be inserted into the recess 57.

[0059] In addition, in the present embodiment, the recess 57 is configured to open upward, but this is not limited to this. When the restraining member 70 is disposed at the housing end 51s of the first housing 51 and radially outward of the second housing 52, a mark or the like may be provided on the outer peripheral surface of the restraining member 70 or the outer peripheral surface of the second housing 52 above the restraining member 70 so that an operator can confirm the circumferential position of the recess 57 when the restraining member 70 is disposed at the housing end 51s of the first housing 51 and radially outward of the second housing 52.

[0060] The present technology can be configured as follows. (1) A motor comprising: a rotor rotatable about a central axis; a stator facing the rotor with a gap therebetween; a first housing accommodating the rotor and the stator and opening to one axial side; a second housing accommodating a substrate electrically connected to the stator and covering the one axial end of the first housing from the one axial side; and an annular restraining member extending in a circumferential direction around the central axis, wherein the first housing has a connected portion provided on the outer circumferential surface of the first housing, and the second housing has a housing main body and a connecting portion that is connected to the housing main body. and a connecting portion located on the other axial side relative to the connecting portion, the connecting portion having a plurality of elastic pieces arranged in a circumferential direction, the elastic pieces being elastically deformable in a radial direction and connected to the connected portion from the radial outside, the restraining member having a ring-shaped portion covering the plurality of elastic pieces from the radial outside, a protruding portion protruding radially inward from an end portion on the other axial side of the ring-shaped portion and abutting against a first end portion on the other axial side of the connecting portion from the other axial side, and a movement restraining portion provided on the ring-shaped portion and restricting movement of the ring-shaped portion to the other axial side relative to the connecting portion. (2) The connecting portion has a recess recessed radially inward from an outer circumferential surface of the connecting portion, The electric pump according to (1), wherein the movement restraining portion has a crimped protrusion that protrudes radially inward from an inner circumferential surface of the ring-shaped portion and is inserted into the recess. (3) The electric pump according to (2), wherein the recess is provided at a position overlapping the elastic piece in the circumferential direction. (4) An electric pump as described in (2) or (3), wherein the connecting portion is located between adjacent elastic pieces in the circumferential direction, has a notch extending from the first end of the connecting portion to one side in the axial direction, and at least a portion of the recess is provided at a position that overlaps with the notch in the axial direction. (5) The electric pump according to any one of (2) to (4), wherein the recessed portion opens to one axial side at a second end portion on one axial side of the connecting portion. [Explanation of symbols]

[0061] 11...rotor, 12...stator, 15...substrate, 51...first housing, 51s...housing end, 52...second housing, 52a...housing main body, 52g...inner peripheral surface, 53...connected portion, 55...connecting portion, 55k...notch, 55s...first end, 55t...second end, 56...elastic piece, 57...recess, 70...restraining member, 71...ring-shaped portion, 72...protruding portion, 73...movement restraining portion, 73t...crimped protrusion, 100...electric pump, J...central axis

Claims

1. a rotor rotatable about a central axis; a stator facing the rotor with a gap therebetween; a first housing that houses the rotor and the stator and is open to one side in the axial direction; a second housing that accommodates a substrate electrically connected to the stator and covers one axial end of the first housing from the one axial side; an annular restraining member extending in a circumferential direction around the central axis, the first housing has a connected portion provided on an outer circumferential surface of the first housing, The second housing includes: A housing body; a connecting portion located on the other axial side of the housing body, The connecting portion has a plurality of elastic pieces arranged in a circumferential direction, the elastic piece is elastically deformable in a radial direction and is connected to the connected portion from the radially outer side, The restraining member is a ring-shaped portion that covers the plurality of elastic pieces from the radially outer side; a protruding portion that protrudes radially inward from an end portion on the other axial side of the ring-shaped portion and abuts against a first end portion on the other axial side of the connecting portion from the other axial side; a movement restraint portion provided on the ring-shaped portion and restricting movement of the ring-shaped portion toward the other axial side relative to the connecting portion, Electric pump.

2. The connecting portion has a recess recessed radially inward from an outer circumferential surface of the connecting portion, The movement restraint portion has a crimped protrusion that protrudes radially inward from an inner circumferential surface of the ring-shaped portion and is inserted into the recess. The electric pump according to claim 1 .

3. The recess is provided at a position overlapping the elastic piece in the circumferential direction. The electric pump according to claim 2.

4. the connecting portion is located between the elastic pieces adjacent to each other in the circumferential direction and has a notch extending from the first end portion of the connecting portion to one side in the axial direction, At least a portion of the recess is provided at a position overlapping with the notch in the axial direction. The electric pump according to claim 2 or 3.

5. The recessed portion is open to one axial side at a second end portion on one axial side of the connecting portion. The electric pump according to claim 2 or 3.

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