Electric pump

Abstract

To provide an electric pump that contributes to suppressing deterioration in an inverter case to solve such a problem that a claw fitted to a housing deforms and which causes an inverter housing and a motor to deform and junction of the housing is loosen.SOLUTION: An electric pump includes a motor case and an inverter case. The inverter case includes a plurality of claws assembled on one side in an axial direction of the motor case and is arrayed in a circumferential direction in an end of the other side in the axial direction. The plurality of claws engages the motor case from an outer peripheral side. The electric pump further includes a metal cylinder member. The cylinder member surrounds the plurality of claws from the outer peripheral side to inhibit the plurality of claws from opening in a direction of separating from the motor case.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, there is an electric pump that includes a motor housing (motor case) and an inverter housing (inverter case) that is assembled to one axial side of the motor housing and has a plurality of claws arranged circumferentially at the end on the other axial side, and the plurality of claws are fitted into the motor housing from the outer circumferential side. Summary of the Invention [Problem to be solved by the invention]

[0003] However, when the above-mentioned electric pump is actually used, there may be other devices around the other axial end of the inverter housing, and it is necessary to remove some of the claws to avoid mutual interference.In that case, the remaining claws are likely to open in the direction away from the motor housing due to vibration, etc., causing the connection between the inverter housing and the motor housing to loosen.

[0004] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide an electric pump that contributes to suppressing loosening of the connection between the inverter housing and the motor housing due to deformation of the claws of the inverter housing fitted to the motor housing. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, the present invention provides an electric pump comprising a motor housing (motor case) and an inverter housing (inverter case) assembled to one axial side of the motor housing and having a plurality of claws arranged circumferentially at an end on the other axial side, the plurality of claws being fitted into the motor housing from the outer circumferential side, and further comprising a metal tubular member that surrounds the plurality of claws from the outer circumferential side and prevents the plurality of claws from spreading in a direction away from the motor housing.

[0006] According to the electric pump of the present invention, a metal tubular member is further provided that surrounds the multiple claws from the outer periphery and suppresses the multiple claws from expanding in a direction away from the motor housing. Therefore, even if it becomes necessary to remove some of the claws from the inverter housing for compactness or to avoid interference with other nearby members, the tubular member can suppress the remaining claws from expanding in a direction away from the motor housing, thereby preventing a decrease in the bonding strength between the inverter housing and the motor housing.

[0007] In the electric pump of the present invention, it is preferable that a first retaining portion is formed on one axial side of the tubular member to prevent the inverter housing from moving in one axial direction relative to the tubular member, and a second retaining portion is formed on the other axial side of the tubular member relative to the first retaining portion to prevent the inverter housing from moving in the other axial direction relative to the tubular member.

[0008] According to the electric pump of the present invention, a first retaining portion is formed on one axial side of the tubular member to suppress axial movement of the inverter case relative to the tubular member, and a second retaining portion is formed on the other axial side of the tubular member to suppress axial movement of the inverter case relative to the tubular member.Therefore, it is possible to suppress the tubular member from falling off in the axial direction from the inverter case, and the function of the tubular member can be reliably ensured.

[0009] In addition, in the electric pump of the present invention, it is preferable that the inverter housing has a first cylindrical portion having the claw on the other axial side, the tubular member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and an extension portion extending toward the inner circumferential side as the first retaining portion is formed at the end portion on one axial side of the cylindrical main body portion and abuts on the end face facing the one axial side of the first cylindrical portion, and a protrusion protruding toward the inner circumferential side as the second retaining portion that fits into a gap formed between two circumferentially adjacent claws is provided midway in the axial direction of the cylindrical main body portion.

[0010] According to the electric pump of the present invention, the inverter housing has a first cylindrical portion having a claw on the other axial side, and the tubular member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and an extension portion extending toward the inner circumferential side is formed at the end portion on one axial side of the cylindrical main body portion as a first retaining portion that contacts the end face facing one axial side of the first cylindrical portion, and a protrusion protruding toward the inner circumferential side is provided midway in the axial direction of the cylindrical main body portion as a second retaining portion that fits into a gap formed between two circumferentially adjacent claws.Therefore, the first retaining portion and the second retaining portion can be formed with a simple configuration, and an increase in manufacturing costs can be suppressed.

[0011] In the electric pump according to the present invention, it is preferable that the claws adjacent to both sides in the circumferential direction of the protrusion abut against the protrusion from both sides in the circumferential direction.

[0012] According to the electric pump of the present invention, the claws adjacent to the protrusions on both circumferential sides abut the claws from both circumferential sides, thereby preventing the tubular member from moving circumferentially relative to the inverter case and more reliably ensuring the function of the tubular member.

[0013] In the electric pump according to the present invention, it is preferable that a plurality of the protrusions are provided at intervals in the circumferential direction.

[0014] According to the electric pump of the present invention, a plurality of protrusions are provided at intervals in the circumferential direction, so that the circumferential forces acting on the inverter case can be balanced and the functionality of the tubular member can be more reliably ensured.

[0015] In the electric pump of the present invention, it is preferable that the inverter housing has a second cylindrical portion adjacent to one axial side of the first cylindrical portion and having an outer diameter smaller than the outer diameter of the first cylindrical portion, and that the end face and / or the outer peripheral surface of the second cylindrical portion is provided with a protrusion portion exposed from the tubular member at a circumferential position corresponding to the protrusion.

[0016] In the electric pump of the present invention, the inverter housing has a second cylindrical portion that is adjacent to the first cylindrical portion on one axial side of the first cylindrical portion and has an outer diameter smaller than the outer diameter of the first cylindrical portion, and the end face and / or outer peripheral surface of the second cylindrical portion is provided with a presenting portion (indication portion) exposed from the tubular member at a circumferential position corresponding to the protrusion.Therefore, during manufacture, the formation position of the protrusion relative to the tubular member can be easily determined in the circumferential direction according to the position of the presenting portion (indication portion), improving manufacturing efficiency.

[0017] In the electric pump of the present invention, it is preferable that the guide portion is a convex portion or a concave portion provided on the outer peripheral surface of the second cylindrical portion, the extension portion extends along the circumferential direction, and the extension portion has a notch recessed toward the outer periphery at a circumferential position corresponding to the guide portion to accommodate the guide portion.

[0018] According to the electric pump of the present invention, the notification portion is a convex or concave portion provided on the outer peripheral surface of the second cylindrical portion, the extension portion extends along the circumferential direction, and the extension portion has a recessed notch formed on the outer circumferential side at a circumferential position corresponding to the notification portion to accommodate the notification portion. Therefore, the notification portion can be formed with a simple structure and increases in manufacturing costs can be suppressed.

[0019] In addition, in the electric pump of the present invention, it is preferable that the inverter housing has a first cylindrical portion having the claw on the other axial side, the tubular member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and an extension portion extending inward as the first retaining portion is formed at the end portion on one axial side of the cylindrical main body portion and contacts the end face facing the one axial side of the first cylindrical portion, a protrusion protruding inward as the second retaining portion and extending in the circumferential direction is provided midway in the axial direction of the cylindrical main body portion, and the first cylindrical portion has a circumferentially extending groove into which the protrusion fits, at a portion located between the claw and the end face in the axial direction.

[0020] According to the electric pump of the present invention, the inverter housing has a first cylindrical portion having a claw on the other axial side, and the cylindrical member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and an extending portion extending inwardly as a first retaining portion is formed at the end portion on one axial side of the cylindrical main body portion and contacts the end face facing one axial side of the first cylindrical portion, and a protrusion protruding inwardly and extending in the circumferential direction as a second retaining portion is provided midway in the axial direction of the cylindrical main body portion, and a groove into which the protrusion fits and extending in the circumferential direction is provided on the first cylindrical portion at a portion located between the claw and the end face in the axial direction. Therefore, the first retaining portion and the second retaining portion can be formed with a simple structure, which can suppress an increase in manufacturing costs, and also, when forming the protrusion, there is no need to precisely position it in the circumferential direction, which can improve manufacturing efficiency.

[0021] In the electric pump according to the present invention, it is preferable that the projections and the grooves are formed continuously in the circumferential direction.

[0022] According to the electric pump of the present invention, the projections and the grooves are formed continuously in the circumferential direction, so that the joining strength between the cylindrical member and the inverter case can be improved.

[0023] In addition, in the electric pump of the present invention, it is preferable that the inverter housing has a first cylindrical portion having the claw on the other axial side, the tubular member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and the end portion on the one axial side of the cylindrical main body portion is formed with a first extension portion extending toward the inner circumferential side as the first retaining portion that abuts against the end face facing the one axial side of the first cylindrical portion, and the end portion on the other axial side of the cylindrical main body portion is formed with a second extension portion extending toward the inner circumferential side as the second retaining portion that abuts against the tip of the claw from the other axial side.

[0024] According to the electric pump of the present invention, the inverter housing has a first cylindrical portion having a claw on the other axial side, and the tubular member has a cylindrical main body portion surrounding the first cylindrical portion from the outer circumferential side, and a first extension portion extending inwardly as a first retaining portion that contacts the end face facing the one axial side of the first cylindrical portion is formed at the end on the one axial side of the cylindrical main body portion, and a second extension portion extending inwardly as a second retaining portion that contacts the tip of the claw from the other axial side is formed at the end on the other axial side of the cylindrical main body portion.Therefore, the first retaining portion and the second retaining portion can be formed with a simple configuration, and an increase in manufacturing costs can be suppressed.

[0025] In the electric pump according to the present invention, it is preferable that the inverter housing has cutouts formed by removing a portion of the claw in the circumferential direction, and the cutouts are evenly distributed in the circumferential direction.

[0026] In the electric pump of the present invention, the inverter housing has a cutout portion where a claw is missing at a portion of the circumference, and since this cutout portion is evenly distributed in the circumferential direction, the balance of the forces that the inverter housing receives in the circumferential direction is maintained, and the function of the tubular member is more reliably ensured.

[0027] In the electric pump according to the present invention, the inverter housing is preferably made of resin. Effect of the Invention

[0028] According to the present invention, a metal tubular member is further provided that surrounds the multiple claws from the outer periphery and suppresses the multiple claws from expanding in a direction away from the motor housing. Therefore, even if it becomes necessary to remove some of the claws on the inverter housing for compactness or to avoid interference with other nearby components, the tubular member can suppress the remaining claws from expanding in a direction away from the motor housing, thereby avoiding a decrease in the joint strength between the inverter housing and the motor housing. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view that illustrates an electric pump according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a state in which a cylindrical member of the electric pump according to the embodiment of the present invention is removed. [Diagram 3] FIG. 3 is a partially cutaway perspective view that illustrates the electric pump according to the embodiment of the present invention. [Figure 4] FIG. 4 is a partially cutaway perspective view that illustrates a schematic view of an electric pump according to a modified example of the present invention. [Diagram 5] FIG. 5 is a partially cutaway perspective view that illustrates an electric pump according to another modified example of the present invention. [Figure 6] FIG. 6 is a partially cutaway perspective view that illustrates an electric pump according to still another modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an electric pump according to an embodiment of the present invention will be described with reference to Figures 1 to 3, where Figure 1 is a perspective view showing a schematic view of the electric pump according to an embodiment of the present invention, Figure 2 is a perspective view showing a schematic view of the electric pump according to an embodiment of the present invention with a cylindrical member removed, and Figure 3 is a partially cross-sectional perspective view showing a schematic view of the electric pump according to an embodiment of the present invention.

[0031] For ease of explanation, one side in the axial direction, which is the direction in which the rotation axis of the motor included in the electric pump extends, is designated as L1, and the other side in the axial direction is designated as L2.

[0032] (Overall configuration of electric pump) 1 to 3, the electric pump 1 includes the following. That is, the electric pump 1 includes a motor housing (motor case) 10 and an inverter housing (inverter case) 20. The inverter housing 20 is assembled to one side L1 in the axial direction of the motor housing 10, and has a plurality of claws 211 arranged along the circumferential direction at an end of the other side L2 in the axial direction, and the plurality of claws 211 are fitted into the motor housing 10 from the outer periphery. The electric pump 1 further includes a metallic tubular member 30 that surrounds the plurality of claws 211 from the outer periphery and restricts the plurality of claws 211 from spreading in a direction away from the motor housing 10.

[0033] As shown in FIG. 1, the electric pump 1 further includes a pump housing 40, which is integrally formed with the motor housing 10 on the other side L2 in the axial direction.

[0034] As shown in FIG. 3 , a tubular member 50 is provided on the inner periphery of the joint between the motor housing 10 and the inverter housing 20, the tubular member 50 extends along the axial direction, and an annular protrusion 51 is formed midway in the axial direction of the tubular member 50, and the annular protrusion 51 is sandwiched between the motor housing 10 and the inverter housing 20 in the axial direction.

[0035] (Motor housing and its internal structure) As shown in FIGS. 1 and 2, the motor housing 10 has a generally cylindrical shape centered on the rotation axis of the motor accommodated in the motor housing 10, and is made of, for example, resin.

[0036] As shown in Figs. 1 and 2, a mounting portion 11 is formed midway in the axial direction of the motor housing 10 so as to protrude outwardly, and the electric pump 1 is fixed to an external device or the like by the mounting portion 11.

[0037] As shown in FIG. 3, an annular groove 12 is formed in the motor housing 10 at a position on one side L1 in the axial direction from the mounting portion 11, and the tips of a plurality of claws 211 of the inverter housing 20 are fitted into the annular groove 12.

[0038] The motor housing 10 also accommodates a rotor and a stator that surrounds the rotor from the outer periphery.

[0039] (Inverter case and its internal structure) 1 and 2, the inverter housing 20 has a generally bottomed cylindrical shape centered on the rotation axis of the motor accommodated in the motor housing 10, and is made of, for example, resin. The inverter case 20 has cutouts 212 formed by removing some of the claws 211 in the circumferential direction, and these cutouts 212 are uniformly distributed in the circumferential direction.

[0040] Specifically, the inverter housing 20 has a first cylindrical portion 21, which has a claw 211 on the other side L2 in the axial direction, and the first cylindrical portion 21 forms a cutout portion 212 by missing a portion of the claw 211 in the circumferential direction. The inverter case 20 also has a second cylindrical portion 22 adjacent to the first cylindrical portion 21 on one axial side L1 of the first cylindrical portion 21 and having a smaller outer diameter than the first cylindrical portion 21. The inverter case 20 also has a bottom portion 23 that closes the opening of the second cylindrical portion 22 on one axial side L1.

[0041] 2, a presenting section (display section) 221 is provided on the outer circumferential surface of the second cylindrical section 22 at a circumferential position corresponding to a protrusion 311 (shown in FIG. 3) of the cylindrical member 30 described below. Moreover, the presenting portion (display portion) 221 is a protrusion (extending in the axial direction in the illustrated example, but not limited to this) provided on the outer circumferential surface of the second cylindrical portion 22.

[0042] A circuit board is housed within the inverter housing 20, and the circuit board is electrically connected to the coil of the stator housed within the motor housing 10, and electrical components such as switching elements are also mounted on the circuit board.

[0043] (Configuration of Cylindrical Member) As shown in FIG. 1, the tubular member 30 has a cylindrical shape centered on the rotation axis of the motor accommodated in the motor housing 10 .

[0044] Also, as shown in FIG. 3, a first retaining portion HD1 is formed on one axial side L1 of the tubular member 30 to suppress movement of the inverter case 20 toward the one axial side L1 relative to the tubular member 30, and a second retaining portion HD2 is formed on the other axial side L2 of the tubular member 30 further than the first retaining portion to suppress movement of the inverter case 20 toward the other axial side L2 relative to the tubular member 30.

[0045] Specifically, as shown in FIG. 3, the tubular member 30 has a tubular main body 31, which surrounds the first tubular portion 21 from the outer periphery, and an extension portion 32 extending toward the inner periphery as a first retaining portion HD1 is formed at one end of the axial direction of the tubular main body 31, and the extension portion 32 contacts the end face facing the one side L1 in the axial direction of the first tubular portion 21. A protrusion 311 protruding toward the inner periphery as a second retaining portion HD2 is provided midway in the axial direction of the tubular main body 31, and the protrusion 311 enters the gap formed between two circumferentially adjacent claws 211. Moreover, the protrusions 311 are formed, for example, by pressing the cylindrical main body 31 from the outer periphery toward the inner periphery. As shown in FIG. 1, the extension portion 32 extends in the circumferential direction, and at a circumferential position corresponding to the presentation portion (display portion) 221, a notch 321 is formed that is recessed toward the outer periphery so that the presentation portion (display portion) 221 is exposed.

[0046] Furthermore, the claws 211 adjacent to the projections 311 on both circumferential sides come into contact with the projections 311 from both circumferential sides. Moreover, a plurality of protrusions 311 are provided at intervals in the circumferential direction. A plurality of protrusions 311 may be provided at equal intervals in the circumferential direction.

[0047] (Pump housing and its internal structure) As shown in FIG. 1, the pump housing 40 has a generally cylindrical shape centered on the rotation axis of the motor accommodated in the motor housing 10, and is made of, for example, resin.

[0048] A pump member driven by a rotor accommodated in the motor housing 10 is disposed within the pump housing 40 .

[0049] (Main Effects of This Embodiment) The electric pump 1 of this embodiment includes a metallic tubular member 30 that surrounds the multiple claws 211 from the outer periphery and restricts the multiple claws 211 from spreading in a direction away from the motor housing 10. Therefore, even if it is necessary to remove some of the claws 211 of the inverter housing 20 for miniaturization or to avoid interference with other nearby members, the tubular member 30 can be used to restrict the remaining claws 211 from spreading in a direction away from the motor housing 10, thereby avoiding a decrease in the bonding strength between the inverter housing 20 and the motor housing 10.

[0050] Although the drawings have been referred to above to illustrate the present invention by way of example, it is apparent that the specific implementation of the present invention is not limited to the above-described embodiments.

[0051] For example, in the above embodiment, as shown in FIG. 4, a protrusion 312 (formed, for example, by pressing the cylindrical main body portion 31 from the outer periphery side to the inner periphery side) that protrudes toward the inner periphery and extends along the circumferential direction as a second retaining portion may be provided midway in the axial direction of the cylindrical main body portion 31, and a groove 213 into which the protrusion 312 is fitted and which extends along the circumferential direction may be provided in the first cylindrical portion 21 at a portion located axially between the claw 211 and the end face facing one side L1 in the axial direction. In this case, it is preferable that the projections 312 and the grooves 213 are each formed continuously in the circumferential direction.

[0052] In addition, in the above embodiment, as shown in Figure 5, a second extension portion 33 extending toward the inner circumference as a second retaining portion may be formed at the end of the other axial side L2 of the cylindrical main body portion 31, and the second extension portion 33 contacts the tip of the claw 211 from the other axial side L2.

[0053] 6, an end portion of the cylindrical main body 31 on the other axial side L2 may extend beyond the claws 211 toward the other axial side L2, and an extending portion extending inward may be formed at the end portion, and this extending portion may be fitted into a groove formed on the outer peripheral surface of the motor housing 10. This can further prevent the inverter case 20 from moving axially relative to the motor case 10.

[0054] In addition, in the above embodiment, the presentation portion (display portion) 221 is provided on the outer peripheral surface of the second tubular portion 22 at a circumferential position corresponding to the protrusion 311 of the tubular member 30, but this is not limited to this, and the presentation portion (display portion) 221 does not have to be formed on the outer peripheral surface of the second tubular portion 22 at the end face facing one axial side L1 of the first tubular portion 21, or the presentation portion (display portion) 221 may be formed simultaneously on the end face facing one axial side L1 of the first tubular portion 21 and on the outer peripheral surface of the second tubular portion 22.

[0055] Moreover, in the above embodiment, the presenting portion (display portion) 221 is a convex portion, but is not limited to this, and the presenting portion (display portion) 221 may be a concave portion, or may be another mark.

[0056] It goes without saying that within the scope of the present invention, the elements of the embodiments can be freely combined, and the elements of the embodiments can be appropriately modified or omitted. [Explanation of symbols]

[0057] 1 Electric pump 10 Motor housing 11 Mounting part 12 Annular groove 20 Inverter housing 21 First cylindrical section 211 Claw 212 Notch 213 Groove 22 Second cylindrical section 221 Presentation section 23 Bottom 30 Cylinder member 31 Cylindrical main body 311 Protrusion 312 Protrusion 32 Extension 321 Notch 33 Second Extension 40 Pump housing 50 Cylindrical member 51 Annular protrusion HD1 1st holding part HD2 2nd holding part

Claims

1. An electric pump comprising: a motor case; and an inverter case, the inverter case being assembled to one axial side of the motor case and having a plurality of claws arranged in a circumferential direction at an end portion on the other axial side, the plurality of claws engaging with the motor case from an outer circumferential side, the electric pump further includes a metal tubular member that surrounds the plurality of claws from an outer circumferential side and restricts the plurality of claws from opening in a direction away from the motor case; a first retaining portion is formed on one side in the axial direction of the cylindrical member, and the first retaining portion restricts movement of the inverter case relative to the cylindrical member toward the one side in the axial direction; An electric pump characterized in that a second retaining portion is formed on the other axial side of the tubular member relative to the first retaining portion, and the second retaining portion limits movement of the inverter case toward the other axial side relative to the tubular member.

2. the inverter case has a first cylindrical portion, and the first cylindrical portion has the claw on the other side in the axial direction, The cylindrical member has a cylindrical main body portion, the cylindrical main body portion surrounding the first cylindrical portion from an outer circumferential side, An extension portion extending toward an inner periphery side is formed at one end of the axial direction of the cylindrical main body portion as the first holding portion, and the extension portion contacts an end surface of the first cylindrical portion facing one side in the axial direction, The electric pump according to claim 1, characterized in that a protrusion protruding toward the inner circumference is provided as the second retaining portion midway in the axial direction of the cylindrical main body portion, and the protrusion enters the gap between two of the claws adjacent to each other in the circumferential direction.

3. 3. The electric pump according to claim 2, wherein the claws adjacent to the projection on both circumferential sides come into contact with the projection from both circumferential sides.

4. The electric pump according to claim 2 , wherein the projections are provided in a plurality at intervals in the circumferential direction.

5. the inverter case has a second cylindrical portion, the second cylindrical portion being adjacent to the first cylindrical portion on one axial side of the first cylindrical portion and having an outer diameter smaller than an outer diameter of the first cylindrical portion; The electric pump according to claim 2 , wherein an indication portion is provided on the end face or the outer circumferential surface of the second cylindrical portion at a circumferential position corresponding to the protrusion, and the indication portion is exposed from the cylindrical member.

6. the indication portion is a convex portion or a concave portion provided on an outer circumferential surface of the second cylindrical portion, The extension portion extends over the entire circumferential direction, The electric pump according to claim 5 , wherein the extending portion has a notch formed at a circumferential position corresponding to the display portion, the notch being recessed toward an outer periphery and configured to accommodate the protruding portion or the recessed portion.

7. the inverter case has a first cylindrical portion, and the first cylindrical portion has the claw on the other side in the axial direction, The cylindrical member has a cylindrical main body portion, and the cylindrical main body portion surrounds the first cylindrical portion from an outer circumferential side. An extension portion extending toward an inner periphery side is formed at one end of the axial direction of the cylindrical main body portion as the first holding portion, and the extension portion contacts an end surface of the first cylindrical portion facing one side in the axial direction, A protrusion that protrudes toward an inner periphery and extends in a circumferential direction is provided as the second holding portion at a midpoint in the axial direction of the cylindrical main body portion, The electric pump according to claim 1, characterized in that the first cylindrical portion has a groove extending in a circumferential direction and into which the protrusion is fitted, at a location axially between the claw and the end face.

8. 8. The electric pump according to claim 7, wherein the projections and the grooves are each formed continuously over the entire circumferential direction.

9. the inverter case has a first cylindrical portion, and the first cylindrical portion has the claw on the other side in the axial direction, The cylindrical member has a cylindrical main body portion, the cylindrical main body portion surrounds the first cylindrical portion from an outer circumferential side, A first extension portion extending toward an inner periphery side is formed at one end of the axial direction of the cylindrical main body portion as the first holding portion, and the first extension portion contacts an end surface of the first cylindrical portion facing one side in the axial direction, The electric pump according to claim 1, characterized in that a second extension portion extending toward the inner circumference is formed as the second retaining portion at the other axial end of the cylindrical main body, and the second extension portion contacts the tip of the claw from the other axial side.

10. 2. The electric pump according to claim 1, wherein the cutouts formed by chipping off some of the claws in the circumferential direction of the inverter case are distributed uniformly in the circumferential direction.

11. 2. The electric pump according to claim 1, wherein the inverter case is made of resin.

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