Electric pump

Abstract

According to one mode of the utility model, the electric pump is provided with a first shell which accommodates a rotor and a stator and is provided with an opening at one axial side; a second housing that accommodates a substrate electrically connected to the stator and covers a housing end portion of the first housing from one side in the axial direction; and a ring-shaped restraining member. The first housing has a connected portion provided on an outer peripheral surface of the first housing. The second housing has a housing main body and a coupling portion located on the other side in the axial direction with respect to the housing main body. The elastic piece of the connecting part can elastically deform in the radial direction and is connected with the connected part from the radial outer side. The restraining member has: an annular portion covering the plurality of elastic pieces from the outside in the radial direction; a protruding section that protrudes radially inward from an end section on the other side in the axial direction of the annular section, and that comes into contact with a first end section on the other side in the axial direction of the connecting section from the other side in the axial direction; and a movement restricting part which is provided in the annular part and restricts the movement of the annular part to the other side in the axial direction with respect to the connecting part.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric pump. BACKGROUND

[0002] A structure is known in which a base and a cover of an electric motor are connected by fitting. For example, a structure is disclosed in Patent Literature 1 in which a base-side fitting portion having a protrusion provided on the base and a cover-side fitting portion having an elastic piece provided on the cover side are provided. In this structure, the base and the cover are connected by fitting the elastic piece of the cover-side fitting portion in the so-called snap-fit configuration of the protrusion of the base-side fitting portion.

[0003] [Related Art Literature]

[0004] [Patent Literature]

[0005] Patent Literature 1: International Publication No. 2022 / 224720 SUMMARY

[0006] In the above structure, the fitting of the snap-fit configuration of the elastic piece and the protrusion can be loosened due to the application of an external force or vibration, etc.

[0007] The utility model in view of above-mentioned situation, one of its purposes lies in providing a kind of electric pump capable of inhibiting the loosening of fixed part.

[0008] One mode of the electric pump of the utility model is provided with: rotor, it can rotate with center axis as center;Stator, it is opposite across gap with the rotor;First shell, it houses the rotor and the stator, and open in axial one side;Second shell, it houses the substrate electrically connected with the stator, and from the axial one side cover the shell end portion of the axial one side of the first shell;And annular constraint component, it extends in the circumferential direction around the center axis.The first shell has the linked part provided on the outer circumferential surface of first shell.The second shell has shell main body and the linking part located in axial other side relative to the shell main body.The linking part has the plurality of elastic pieces arranged in the circumferential direction.The elastic piece can be elastically deformed in radial direction, and is linked with the linked part from radial outer side.The constraint component has: annular part, it covers the plurality of elastic pieces from radial outer side;Protruding portion, it protrudes from the end portion of the axial other side of the annular part to radial inner side, and from the axial other side and the first end portion of the axial other side of the linking part bump;And movement constraint portion, it is provided in the annular part, and limit the movement of the annular part relative to the linking part to the axial other side.

[0009] According to one mode of the utility model, an electric pump capable of inhibiting the loosening of fixed part is provided. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 FIG. 1 is a front view of an electric pump according to an embodiment.

[0011] Figure 2 FIG. 2 is a perspective view of the electric pump according to the embodiment.

[0012] Figure 3 FIG. 3 is a cross-sectional view of the electric pump according to the embodiment along a central axis.

[0013] Figure 4 FIG. 4 is a perspective view showing a first case of the electric pump according to the embodiment.

[0014] Figure 5 FIG. 5 is a perspective view showing a state in which a constraint member is removed in the electric pump according to the embodiment.

[0015] Figure 6 FIG. 6 is a perspective view showing a second case of the electric pump according to the embodiment.

[0016] Figure 7 FIG. 7 is a perspective view showing the constraint member of the electric pump according to the embodiment.

[0017] Figure 8 FIG. 8 is a view showing a state in which the constraint member is disposed on the first case in advance when the electric pump according to the embodiment is assembled.

[0018] Figure 9 FIG. 9 is a view showing a state in which the second case is covered on an upper side of the first case when the electric pump according to the embodiment is assembled. DETAILED DESCRIPTION

[0019] Figure 1 FIG. 10 is a front view of the electric pump 100 according to the embodiment. Figure 2 FIG. 11 is a perspective view of the electric pump 100 according to the embodiment. Figure 3 FIG. 12 is a cross-sectional view of the electric pump 100 according to the embodiment along a central axis J.

[0020] A central axis J of the electric pump of the following embodiments is appropriately shown in each drawing. The central axis J is an imaginary axis. In the following description, a direction in which the central axis J extends, that is, an axial direction of the central axis J is simply referred to as an "axial direction", a radial direction with the central axis J as a center is simply referred to as a "radial direction", and a circumferential direction with the central axis J as a center is simply referred to as a "circumferential direction". In each drawing, a Z axis parallel to the axial direction is shown. In the following description, a side (+Z side) to which an arrow of the Z axis in the axial direction is directed is referred to as an "upper side", and a side (-Z side) opposite to the side to which the arrow of the Z axis in the axial direction is directed is referred to as a "lower side". In the following embodiments, the upper side corresponds to an "axial one side", and the lower side corresponds to an "axial other side". In addition, the upper side and the lower side are names used only for explaining a positional relationship and the like of each part, and an actual positional relationship and the like can be a positional relationship and the like other than those shown by the names.

[0021] Figures 1-3 The electric pump 100 of the present embodiment shown is mounted on, for example, a vehicle. The fluid delivered by the electric pump 100 is, for example, oil. In addition, the fluid delivered by the electric pump 100 is not particularly limited and can be a fluid other than oil such as water. The electric pump 100 mainly includes a rotary electric machine 10, a pump mechanism 20, and a housing 50.

[0022] As shown in FIG. 1, the rotary electric machine 10 includes the rotor 11, the stator 12, and the substrate 15. That is, the electric pump 100 includes the rotor 11, the stator 12, and the substrate 15. Figure 3

[0023] The rotor 11 is provided so as to be rotatable about the 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 rotatably supported by the first housing 51 described later about the central axis J. The rotor core 11c is fixed to an outer peripheral surface of an end portion of the shaft 11s on the upper side in the axial direction. The rotor core 11c holds a plurality of magnets (not shown). An end portion of the shaft 11s on the lower side is connected to the inner rotor 21.

[0024] The stator 12 opposes the rotor 11 with a gap therebetween. The stator 12 is located radially outward of the rotor 11. The stator 12 has an annular shape that surrounds the rotor 11. The stator 12 has a stator core (not shown) and a plurality of coils 12c mounted to the stator core via an insulator (not shown).

[0025] The substrate 15 is electrically connected to the stator 12. The substrate 15 is a printed wiring substrate provided with a wiring pattern (not shown). An inverter circuit (not shown) that supplies electric power to the stator 12 is provided on the substrate 15. The inverter circuit supplies electric current to the coils 12c. Thereby, the rotor 11 rotates, and the pump mechanism 20 described later is driven.

[0026] ​The pump mechanism 20 is driven by the rotary electric machine 10 to deliver fluid. The pump mechanism 20 is housed in a pump chamber 52p provided in a first housing 51 described later. The pump mechanism 20 has an inner rotor 21 and an outer rotor 22. The inner rotor 21 is fixed to an outer peripheral surface of a lower side end portion of the shaft 11s. The inner rotor 21 is rotationally driven by the rotary electric machine 10 together with the shaft 11s of the rotor 11 about the central axis J. The outer rotor 22 is provided radially outward of the inner rotor 21 and engages with the inner rotor 21.

[0027] The housing 50 houses the pump mechanism 20, the rotor 11, the stator 12, and the substrate 15. The housing 50 has the first housing 51, a second housing 52, and a restraint member 70.

[0028] Figure 4 is a perspective view showing the first housing 51 of the electric pump 100 of the present embodiment.

[0029] The first housing 51 houses the pump mechanism 20, the rotor 11, and the stator 12. The first housing 51 is made of metal. As shown in Figures 1-4 , the first housing 51 is a cylinder that is open at an upper side. The first housing 51 has a first housing main body portion 51a and a mounting portion 51b.

[0030] The first housing main body portion 51a is a substantially cylindrical shape that is centered on the central axis J and is open at an upper side. As shown in Figure 3 , the first housing main body portion 51a has a stator housing portion 51c and a pump mechanism housing portion 51d.

[0031] The stator housing portion 51c is a substantially cylindrical shape that is centered on the central axis J and is open at an upper side. The stator housing portion 51c houses the stator 12. An outer peripheral surface of a stator core (not shown) is fixed to an inner peripheral surface of the stator housing portion 51c. The stator housing portion 51c has a bottom wall portion 51h located at a lower side. The shaft 11s penetrates the bottom wall portion 51h in an axial direction.

[0032] The pump mechanism housing portion 51d continuously extends downward from the stator housing portion 51c. The pump mechanism housing portion 51d is recessed upward from a surface of the lower side of the first housing main body portion 51a. A lower end portion of the shaft 11s and the inner rotor 21 are housed in the pump mechanism housing portion 51d.

[0033] A pump cover (not shown) is mounted to the lower side of the first housing main body portion 51a. The pump cover (not shown) plugs at least a portion of an opening of the lower side of the pump mechanism housing portion 51d. By being surrounded by the pump mechanism housing portion 51d and the pump cover (not shown), a pump chamber 52p that houses the pump mechanism 20 inside is formed.

[0034] As shown in Figure 4As shown, the mounting portion 51b protrudes radially outward from the end portion of the lower side of the first housing main body portion 51a. The mounting portion 51b and the stator housing portion 51c are portions of the same single member. The mounting portion 51b is provided with a plurality of mounting holes 51f that pass through the mounting portion 51b in the axial direction. The electric pump 100 is fixed to the device by fastening bolts that pass through the mounting holes 51f of the mounting portion 51b to the frame of the device.

[0035] A joining portion 53 is provided on the outer peripheral surface of the housing end portion 51s on the upper side of the first housing main body portion 51a toward the radially outer side. That is, the first housing 51 has the joining portion 53. In the present embodiment, the joining portion 53 has a groove 53m that is recessed from the outer peripheral surface of the housing end portion 51s toward the radially inner side and is continuous in the circumferential direction. The joining portion 53 has a tapered portion 53t whose outer diameter gradually decreases from the lower side toward the upper side. The groove 53m is provided on the lower side of the tapered portion 53t.

[0036] The second housing 52 is fixed on the upper side of the first housing 51. The second housing 52 covers the housing end portion 51s of the first housing 51 from the upper side. The second housing 52 plugs the opening on the upper side of the first housing 51. The second housing 52 has insulating properties. In the present embodiment, the second housing 52 is made of resin. The second housing 52 houses the substrate 15.

[0037] Figure 5 is a perspective view showing a state in which the restraint member 70 is removed from the electric pump 100 of the present embodiment. Figure 6 is a perspective view showing the second housing 52 of the electric pump 100 of the present embodiment.

[0038] As shown in Figure 3 , Figure 5 , Figure 6 , the second housing 52 has a housing main body 52a, a cover portion 52c, and a plurality of joining portions 55.

[0039] The housing main body 52a is in a cylindrical shape around the center axis J. More specifically, the housing main body 52a is in a substantially cylindrical shape extending in the up-down direction with the center axis J as the center. As shown in Figure 3 , the substrate 15 is disposed on the radially inner side of the housing main body 52a. The cover portion 52c closes the opening on the upper side of the housing main body 52a. As shown in Figure 5 , the cover portion 52c is fixed to the end portion on the upper side of the housing main body 52a by a plurality of screws 52d.

[0040] As shown in Figure 5 , Figure 6As shown, a connector portion 52e is provided on the housing body 52a. The connector portion 52e protrudes radially outward from the housing body 52a. Although not shown in the figure, the connector portion 52e holds a plurality of terminals. These terminals are electrically connected to the substrate 15. A connector for an external device is connected to the connector portion 52e.

[0041] like Figure 3 As shown, an end face 52f is provided at the lower end of the housing body 52a. The end face 52f extends radially outward from the inner circumferential surface 52g of the housing body 52a. The end face 52f is a downward-facing, annular surface surrounding the central axis J.

[0042] With the second housing 52 fixed to the upper side of the first housing 51, the outer periphery of the retaining member 59 is clamped between the end face 52f and the housing end 51s of the first housing. The retaining member 59 is approximately disc-shaped (annular) with the central axis J as its center. In this embodiment, the retaining member 59 holds the connection terminals, busbars (not shown), etc., that connect the stator 12 and the substrate 15. The retaining member 59 is manufactured by molding the connection terminals, busbars, etc., as inserts for embedded components.

[0043] like Figure 3 , Figure 6 As shown, the connecting portion 55 extends continuously downward from the housing body 52a. The connecting portion 55 is generally cylindrical, extending vertically about the central axis J. The connecting portion 55 is located 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. With the second housing 52 fixed to the upper side of the first housing 51, the connecting portion 55 is located radially outward from the upper housing end 51s of the first housing 51. That is, the upper housing end 51s of the first housing 51 is inserted into the inner side of the connecting portion 55 located at the lower end of the second housing 52.

[0044] like Figure 5 , Figure 6 As shown, the connecting portion 55 has an annular portion 55c and a plurality of elastic pieces 56 arranged circumferentially. The annular portion 55c is provided at the upper end of the connecting portion 55. The annular portion 55c is in the shape of a ring extending circumferentially. The connecting portion 55 in this embodiment has, for example, 12 elastic pieces 56. Each elastic piece 56 extends downward from the annular portion 55c. That is, the annular portion 55c connects the upper base ends 56b of the plurality of elastic pieces 56 to each other.

[0045] Each elastic piece 56 extends from the housing body 52a to the other side in the axial direction. The lower front end 56s of each elastic piece 56 is capable of radial elastic deformation relative to the base end 56b connected to the housing body 52a. Each elastic piece 56 is configured such that its circumferential width gradually decreases from the upper side to the lower side.

[0046] Each elastic sheet 56 has a claw 56t protruding radially inward at its front end 56s on the lower side. For example... Figure 3 and Figure 5 As shown, the claw portion 56t of the elastic piece 56 hooks into the groove 53m of the connected portion 53 of the first housing 51. That is, the elastic piece 56 can elastically deform in the radial direction and connect to the connected portion 53 from the radially outer side. The second housing 52 overlaps radially with the housing end 51s of the first housing 51 at a plurality of elastic pieces 56.

[0047] A slit 55k is provided between adjacent elastic pieces 56 in the circumferential direction. The slit 55k extends upward from the first end 55s on the lower side of the connecting portion 55. Therefore, the slit 55k is open on the lower side.

[0048] like Figure 5 , Figure 6 As shown, the connecting portion 55 has a plurality of recesses 57 spaced apart in the circumferential direction at its upper second end 55t. In this embodiment, the connecting portion 55 has, for example, six recesses 57. Each recess 57 is recessed radially inward from the outer peripheral surface of the annular portion 55c of the connecting portion 55. The recesses 57 extend in the vertical direction.

[0049] Furthermore, a plurality of weight-reducing recesses 52k are provided on the housing body 52a, each located above the recess 57. The weight-reducing recesses 52k are recessed radially inward from the outer periphery of the housing body 52a. The plurality of weight-reducing recesses 52k are arranged in a circumferential direction. The second end 55t of the recess 57 on the upper side of the connecting portion 55 opens upward and communicates with the interior of the weight-reducing recesses 52k.

[0050] Each recess 57 is positioned circumferentially to overlap with the elastic sheet 56. In other words, each recess 57 is positioned between adjacent circumferential cutouts 55k. The lower end of each recess 57 is positioned axially to overlap with the cutout 55k. Each recess 57 has a pair of inclined surfaces 57s on both sides of its circumferential direction, such that its circumferential width gradually increases from the radially inner side to the outer side. The recess 57 is configured such that its circumferential width gradually increases from the lower side to the upper side.

[0051] like Figures 1-3 As shown, the constraint member 70 is disposed radially outside the portion where the first housing 51 and the second housing 52 overlap radially. Figure 3 As shown, the restraining member 70 is disposed 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 51s of the first housing 51 and the connecting portion 55 of the second housing 52. The restraining member 70 is annular (cylindrical) in shape, extending circumferentially around the central axis J.

[0052] Figure 7is a perspective view showing the restriction member 70 of the electric pump 100 of the present embodiment.

[0053] As shown in Figure 3 , Figure 7 , the restriction member 70 includes a ring portion 71, a protruding portion 72, and a movement restriction portion 73. The ring portion 71 is substantially cylindrical and extends in the up-down direction with the center axis J as the center. In a state where the second housing 52 is fixed to the upper side of the first housing 51, the ring portion 71 covers the plurality of elastic pieces 56 from the radially outer side. The ring portion 71 restricts the plurality of elastic pieces 56, limiting deformation of the elastic pieces 56 to the radially outer side.

[0054] The protruding portion 72 protrudes from the lower end of the ring portion 71 to the radially inner side. The protruding portion 72 extends obliquely downward and to the radially inner side from the lower end of the ring portion 71. In the present embodiment, the protruding portion 72 is continuously provided in the circumferential direction. Alternatively, the protruding portion 72 can be provided in a plurality of portions spaced apart in the circumferential direction. The protruding portion 72 abuts against the first end portion 55s of the lower side of the coupling portion 55 of the second housing 52 from the lower side. Thereby, movement of the restriction member 70 to the upper side is limited.

[0055] The movement restriction portion 73 is provided to the ring portion 71. The movement restriction portion 73 of the present embodiment has a plurality of (for example, six) clinching protrusions 73t protruding from the inner peripheral surface of the ring portion 71 to the radially inner side. The clinching protrusions 73t are provided by pressing the outer peripheral surface of the ring portion 71 to the radially inner side with a punch or the like tool, causing plastic deformation of the ring portion 71. The clinching protrusions 73t are inserted into the recessed portions 57 of the coupling portion 55 of the second housing 52. Thereby, the clinching protrusions 73t are caught by the inner side surface of the recessed portions 57, limiting movement of the ring portion 71 to the circumferential direction and the lower side with respect to the coupling portion 55.

[0056] Figure 8 is a view showing a state where the restriction member 70 is provided to the first housing 51 in advance when the electric pump 100 of the present embodiment is assembled. Figure 9 is a view showing a state where the second housing 52 is covered by the upper side of the first housing 51 when the electric pump 100 of the present embodiment is assembled.

[0057] As shown in Figure 8 , when the electric pump 100 is assembled, first, the rotor 11, the stator 12, and the pump mechanism 20 are assembled inside the first housing 51. Next, the holding member 59 is placed on the upper side of the first housing 51. On the holding member 59, the substrate 15 is mounted via a spacer not shown by a screw or the like. In addition, the restriction member 70 is arranged on the radially outer side of the first housing 51. In addition, the restriction member 70 is in a state where the clinching protrusions 73t are not formed.

[0058] As shown in Figure 9As shown, the second housing 52 is then placed over the upper side of the first housing 51. At this time, a retaining member 59 is inserted between the end face 52f of the second housing 52 and the housing end 51s of the first housing. Furthermore, the claw portions 56t of the plurality of elastic tabs 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. Thus, the second housing 52 is fixed to the upper side of the first housing 51.

[0059] Next, as Figure 3 As shown, the restraining member 70 is moved upward, and the annular portion 71 covers multiple elastic sheets 56 radially outward. The restraining member 70 moves until the protrusion 72 abuts against the first end 55s of the connecting portion 55 of the second housing 52 from below. Then, using appropriate machining machinery, multiple riveting protrusions 73t are formed on the annular portion 71. Each riveting protrusion 73t is pressed radially inward towards the outer peripheral surface of the annular portion 71 by a tool such as a punch, causing the annular portion 71 to plastically deform and thus insert into the recess 57 of the connecting portion 55 of the second housing 52. This restricts the circumferential and downward movement of the annular portion 71 relative to the connecting portion 55. In this way, the circumferential and axial movement of the restraining member 70 relative to the second housing 52 is restricted.

[0060] The electric pump 100 of this embodiment includes an annular constraint member 70 extending circumferentially about a central axis J. A first housing 51 has a connected portion 53 provided on its outer peripheral surface. A second housing 52 has a housing body 52a and a connecting portion 55 located axially opposite to the housing body 52a. Furthermore, the connecting portion 55 has a plurality of elastic pieces 56 capable of being connected to the connected portion 53. The constraint member 70 has an annular portion 71, a protrusion 72, and a movable constraint portion 73. The annular portion 71 covers the plurality of elastic pieces 56 from the radially outer side. Thus, the annular portion 71 restricts the deformation of the plurality of elastic pieces 56 radially outward. The protrusion 72 abuts against a first end 55s on the axially opposite side of the connecting portion 55 from the axially opposite side. Thus, the protrusion 72 restricts the constraint member 70 from moving axially relative to the second housing 52. The movable constraint portion 73 is provided on the annular portion 71. The movable constraint part 73 restricts the annular part 71 from moving axially to the other side relative to the connecting part 55.

[0061] According to the electric pump 100 of this embodiment, the annular portion 71 of the restraint member 70 covers a plurality of elastic sheets 56 from the radially outer side. As a result, it is possible to prevent the connection between the plurality of elastic sheets 56 and the connected portion 53 of the first housing 51 from being accidentally released due to external force or vibration, or from becoming loose due to vibration.

[0062] Further, the restriction member 70 of the present embodiment is restricted from moving to the axial direction one side by the protruding portion 72 abutting against the first end portion 55s of the coupling portion 55 on the axial direction other side. That is, the restriction member 70 of the present embodiment is restricted from moving to the axial direction one side with respect to the first housing 51 by the protruding portion 72 and the first end portion 55s. Therefore, it is not necessary to provide a portion extending to the radial direction outer side or the like on the second housing 52 in order to restrict the movement of the restriction member 70 to the axial direction one side with respect to the first housing 51. Therefore, according to the present embodiment, it is possible to suppress the radial direction enlargement of the second housing 52.

[0063] Further, according to the present embodiment, the movement of the annular portion 71 to the axial direction other side with respect to the coupling portion 55 is restricted by the movement restriction portion 73 in the state where the protruding portion 72 abuts against the first end portion 55s of the coupling portion 55 on the axial direction other side. Therefore, the positional deviation of the movement restriction portion 73 in the axial direction is suppressed.

[0064] In the present embodiment, the coupling portion 55 has a recessed portion 57 recessed from the outer peripheral surface of the coupling portion 55 to the radial direction inner side. Further, the movement restriction portion 73 has a rivet protrusion 73t protruding from the inner peripheral surface of the annular portion 71 to the radial direction inner side and inserted into the recessed portion 57. According to the present embodiment, the rivet protrusion 73t is formed and inserted into the recessed portion 57 in the state where the protruding portion 72 abuts against the first end portion 55s, whereby it is possible to restrict the movement of the restriction member 70 to the circumferential direction and lower side with respect to the coupling portion 55. Thereby, it is possible to simplify the mounting process of mounting the restriction member 70 to the second housing 52.

[0065] In the present embodiment, the recessed portion 57 is provided at a position overlapping the elastic piece 56 in the circumferential direction. According to the present embodiment, it is possible to downsize the coupling portion 55 having the elastic piece 56 and the rivet protrusion 73t inserted into the recessed portion 57 in the axial direction.

[0066] Further, in the present embodiment, the coupling portion 55 has a plurality of cutouts 55k extending from the first end portion 55s of the coupling portion 55 to the axial direction one side. The cutouts 55k are located between the circumferentially adjacent elastic pieces 56. At least a portion (in the present embodiment, the lower end portion) of the recessed portion 57 is provided at a position overlapping the cutout 55k in the axial direction. According to the present embodiment, it is possible to downsize the second housing 52 in the axial direction as compared with the case where the recessed portion 57 and the cutout 55k are arranged to be offset in the axial direction. Thereby, it is possible to provide an electric pump 100 downsized in the axial direction.

[0067] In the present embodiment, the recess 57 is opened to the axial direction on the second end portion 55t of the coupling portion 55 on the axial direction side. According to the present embodiment, in a state where the restriction member 70 is arranged on the outer periphery of the second housing, the position of the recess 57 can be easily visually confirmed by observing the gap provided between the restriction member 70 and the second housing from the axial direction side from the upper side. Thus, the caulking protrusion 73t can be easily formed in correspondence with the position of the recess 57.

[0068] The above describes one embodiment of the present application, but the structures and combinations thereof in the embodiment are one example, and additional, omission, replacement, and other changes of the structures can be made without departing from the spirit of the present application. The present application is not limited by the embodiment.

[0069] For example, in the present embodiment, the groove 53m is provided as the coupled portion 53, and the claw portion 56t is provided in the coupling portion 55, but the present application is not limited thereto. For example, a protrusion (not shown) that protrudes to the radial direction outside from the outer peripheral surface of the first housing 51 can be provided as the coupled portion 53, and a recess, a hole, or the like that can be coupled with the protrusion can be provided in the coupling portion 55.

[0070] In the present embodiment, the caulking protrusion 73t is provided in the moving restriction portion 73 to be inserted into the recess 57, but a screw or the like can be inserted into the recess 57 instead of the caulking protrusion 73t.

[0071] In the present embodiment, the recess 57 is opened on the upper side, but the present application is not limited thereto. When the restriction member 70 is arranged on the housing end portion 51s of the first housing 51 and the radial direction outside of the second housing 52, a mark or the like can be marked on the outer peripheral surface of the second housing 52 on the upper side of the restriction member 70, the outer peripheral surface of the restriction member 70, or the like, so that the position of the recess 57 in the circumferential direction can be confirmed by the worker.

[0072] In addition, the present technology can employ the following structure.

[0073] (1) An electric pump comprising: a rotor rotatable about a center axis; a stator opposed to the rotor with a gap therebetween; a first housing accommodating the rotor and the stator and open at one axial side; a second housing accommodating a substrate electrically connected to the stator and covering a housing end portion of the first housing at the one axial side; and a ring-shaped restraint member extending in a circumferential direction about the center axis, the first housing having a linked portion provided to an outer peripheral surface of the first housing, the second housing having a housing main body and a linking portion located at the other axial side with respect to the housing main body, the linking portion having a plurality of elastic pieces arranged in the circumferential direction, the elastic pieces being elastically deformable in a radial direction and linked to the linked portion from a radially outer side, the restraint member having: a ring-shaped portion covering the plurality of elastic pieces from the radially outer side; a protruding portion protruding from an end portion of the ring-shaped portion at the other axial side toward the radially inner side and abutting against a first end portion of the linking portion at the other axial side; and a movement restraint portion provided to the ring-shaped portion and restricting movement of the ring-shaped portion toward the other axial side with respect to the linking portion.

[0074] (2) The electric pump according to (1), wherein the linking portion has a recess recessed toward the radially inner side from an outer peripheral surface of the linking portion, and the movement restraint portion has a riveting protrusion protruding toward the radially inner side from an inner peripheral surface of the ring-shaped portion and inserted into the recess.

[0075] (3) The electric pump according to (2), wherein the recess is provided at a position overlapping the elastic pieces in the circumferential direction.

[0076] (4) The electric pump according to (2) or (3), wherein the linking portion has a cutout between the elastic pieces adjacent to each other in the circumferential direction and extending toward the one axial side from the first end portion of the linking portion, and at least a part of the recess is provided at a position overlapping the cutout in the axial direction.

[0077] (5) The electric pump according to any one of (2) to (4), wherein the recess is open at a second end portion of the linking portion at the one axial side toward the one axial side.

[0078] Symbol Explanation

[0079] 11 rotor; 12 stator; 15 substrate; 51 first housing; 51s housing end portion; 52 second housing; 52a housing main body; 52g inner peripheral surface; 53 linked portion; 55 linking portion; 55k cutout; 55s first end portion; 55t second end portion; 56 elastic piece; 57 recess; 70 restraint member; 71 ring-shaped portion; 72 protruding portion; 73 movement restraint portion; 73t riveting protrusion; 100 electric pump; J center axis.

Claims

1. An electric pump characterized by comprising: Possessing: a rotor rotatable about a center axis; a stator opposed to the rotor with a gap therebetween; a first housing that houses the rotor and the stator and is open at one axial side; a second housing that houses a substrate electrically connected to the stator and covers a housing end portion of the first housing at one axial side from one axial side; and a ring-shaped restriction member extending in a circumferential direction about the center axis, the first housing has a joined portion provided to an outer peripheral surface of the first housing, the second housing has: a housing main body; and a joined portion located at the other axial side with respect to the housing main body, the joined portion has a plurality of elastic pieces arranged in the circumferential direction, the elastic pieces are elastically deformable in the radial direction and joined to the joined portion from the radially outer side, the restriction member has: a ring-shaped portion covering the plurality of elastic pieces from the radially outer side; a protruding portion protruding from an end portion of the ring-shaped portion at the other axial side toward the radially inner side and abutting against a first end portion of the joined portion at the other axial side; and a movement restriction portion provided to the ring-shaped portion and restricting movement of the ring-shaped portion toward the other axial side with respect to the joined portion.

2. The electric pump according to claim 1, wherein the joined portion has a recess recessed from an outer peripheral surface of the joined portion toward the radially inner side, the movement restriction portion has a riveting protrusion protruding from an inner peripheral surface of the ring-shaped portion toward the radially inner side and inserted into the recess.

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

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

5. The electric pump according to claim 2 or 3, wherein the recess is open at a second end portion of the joined portion at the one axial side toward the one axial side.

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