Pump and method of manufacturing pump

Abstract

A pump is provided with: a rotor capable of rotating about a central axis; a fixed shaft extending in the axial direction and rotatably supporting the rotor; the stator is positioned on the radial outer side of the rotor and surrounds the rotor; and a pump part connected to one side of the rotor in the axial direction. The rotor includes: a rotor body; a bearing member rotatably supported by the fixed shaft; and a resin part in which at least a portion of the bearing member is embedded and which fixes the rotor body and the bearing member to each other. The bearing member has: a first surface which is an end surface on one side in the axial direction or an end surface on the other side in the axial direction; and a second surface facing a side facing the first surface in the axial direction. An axial position of the first surface is different from an axial position of the rotor body. An axial position where the second surface is provided in the bearing member becomes a portion between the rotor body and the first surface. The resin portion has a portion in contact with the second surface.

Description

Technical Field

[0001] The present invention relates to a pump and a method for manufacturing a pump. Background Art

[0002] Conventionally, there is known a pump including a rotor in which a bearing portion supported by a shaft member and a rotor main body including, for example, a magnet portion are integrated via a support member made of resin (for example, Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-183766 Summary of the invention

[0004] In the above-mentioned pump, for example, a resin support component is manufactured by insert molding in which the rotor body and the bearing portion are embedded components. In this case, there is the following problem: when insert molding is performed, the bearing portion is offset in the axial direction inside the mold, and the quality of the manufactured rotor is deviated. In this regard, for example, if insert molding is performed while the bearing portion is pressed axially by the mold, the axial position deviation of the bearing portion in the mold during insert molding can be suppressed. However, in this case, it is necessary to improve the dimensional accuracy of the bearing portion in the axial direction, or to provide a structure on the mold that can absorb the deviation of the axial dimension of the bearing portion, etc., which increases the manufacturing cost of the rotor.

[0005] In view of the above circumstances, one object of the present invention is to provide a pump having a structure capable of suppressing an increase in the manufacturing cost of a rotor and suppressing variations in the quality of the rotor, and a method for manufacturing such a pump.

[0006] One embodiment of the pump of the present invention comprises: a rotor that can rotate around a central axis; a fixed shaft that extends in the axial direction and supports the rotor so that it can rotate; a stator that is located radially outside the rotor and surrounds the rotor; and a pump part that is connected to one axial side of the rotor. The rotor comprises: a rotor body; a bearing component that is supported by the fixed shaft so that it can rotate; and a resin part that embeds at least a part of the bearing component and fixes the rotor body and the bearing component to each other. The bearing component comprises: a first surface that is an end surface on one axial side or an end surface on the other axial side; and a second surface that faces the side in the axial direction to which the first surface faces. The axial position of the first surface is different from the axial position of the rotor body. The axial position of the second surface set in the bearing component becomes a part between the rotor body and the first surface. The resin part has a part that contacts the second surface.

[0007] In one embodiment of the pump manufacturing method of the present invention, the pump includes: a rotor that can rotate around a central axis; a fixed shaft that extends in the axial direction and supports the rotor so that it can rotate; a stator that is located radially outside the rotor and surrounds the rotor; and a pump part that is connected to one axial side of the rotor, and the pump manufacturing method includes an insert molding process, in which a rotor body and a bearing component that is supported by the fixed shaft so that it can rotate are arranged in a mold, and a resin part is produced by flowing resin into the mold. The bearing component has a first surface that is an end surface on one axial side or an end surface on the other axial side; and a second surface that faces the side that the first surface faces in the axial direction. In the insert molding process, the axial position of the first surface in the mold is different from the axial position of the rotor body, the axial position of the second surface in the mold is an axial position between the rotor body and the first surface, the second surface is exposed in the mold, and the gate into which the resin flows into the mold is located on the side of the mold that the second surface faces in the axial direction.

[0008] According to one aspect of the present invention, in a pump, it is possible to suppress an increase in the manufacturing cost of the rotor and to suppress variations in the quality of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a perspective view showing a pump according to an embodiment. Figure 2 is a cross-sectional view showing a pump according to one embodiment. Figure 3 Sectional view II-II in FIG. Figure 3 This is a cross-sectional view showing a pump according to an embodiment. Figure 4 This is a cross-sectional view showing a part of a pump in one embodiment. Figure 5 It is a perspective view showing a bearing component according to one embodiment. Figure 6 It is a cross-sectional view showing a part of the sequence of the insert molding step in one embodiment. Figure 7 This is a cross-sectional view showing a part of a pump in a modified example of one embodiment. DETAILED DESCRIPTION

[0010] In each figure, a central axis J of a pump of an embodiment described below is hypothetically shown. In the following description, the axial direction of the central axis J is simply referred to as "axial direction", the radial direction centered on the central axis J is simply referred to as "radial direction", and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction". The Z axis shown in each figure shows the direction in which the central axis J extends. In the following description, the side opposite to the side to which the arrow of the Z axis in the axial direction points (-Z side) is referred to as "one axial side", and the side to which the arrow of the Z axis in the axial direction points (+Z side) is referred to as "the other axial side". Figure 2 In FIG. 1 , for the sake of explanation, cross sections at different circumferential positions on both sides of the center axis J are shown.

[0011] Figure 1 and Figure 2 The pump 100 of the present embodiment shown is a water pump for conveying water. Figure 2 As shown, the pump 100 of this embodiment includes a rotor 10, a stator 20, a fixed shaft 30, a pump unit 40, a housing 50, and a base plate 90. The housing 50 includes a first housing 60, a second housing 70, and a cover member 51 made of resin.

[0012] The rotor 10 is rotatable about a central axis J. The rotor 10 includes a rotor core 11, a magnet 12, a first resin portion 13, a second resin portion 14, and a bearing member 80. Figure 3 As shown, the rotor core 11 is in a ring shape surrounding the central axis J. The magnet 12 is fixed to the radially outer surface of the rotor core 11. A plurality of magnets 12 are provided at intervals in the circumferential direction. In the present embodiment, eight magnets 12 are provided.

[0013] In the present embodiment, the rotor body 16 is constituted by the rotor core 11 and the plurality of magnets 12. That is, the rotor 10 has the rotor body 16. In the present embodiment, the end of the rotor core 11 on one axial side (-Z side) and the end of the plurality of magnets 12 on one axial side are located at the same position in the axial direction. The end of the rotor body 16 on one axial side is constituted by the end of the rotor core 11 on one axial side and the end of the plurality of magnets 12 on one axial side. The end of the rotor core 11 on the other axial side (+Z side) and the end of the magnet 12 on the other axial side are located at the same position in the axial direction. The end of the rotor body 16 on the other axial side is constituted by the end of the rotor core 11 on the other axial side and the end of the plurality of magnets 12 on the other axial side.

[0014] The first resin portion 13 is substantially cylindrical and surrounds the central axis J and extends in the axial direction. Figure 2As shown, the first resin portion 13 covers the rotor body 16, that is, the rotor core 11 and the plurality of magnets 12, from the radially outer side and the axially opposite sides. The rotor body 16 is embedded in the first resin portion 13. In the present embodiment, the first resin portion 13 is manufactured by insert molding in which the rotor body 16 is an embedded component.

[0015] The second resin portion 14 is in a generally cylindrical shape that surrounds the central axis J and extends in the axial direction. The second resin portion 14 is located radially inside the rotor core 11. The second resin portion 14 covers the radially inside surface of the rotor core 11. The second resin portion 14 has a portion that clamps the first resin portion 13 in the axial direction. The second resin portion 14 is fixed to the first resin portion 13. In the present embodiment, the second resin portion 14 is manufactured by insert molding in which the molded body 15 and the bearing component 80 are embedded components. The molded body 15 is a molded body in which the rotor body 16 and the first resin portion 13 are integrally molded by insert molding.

[0016] An impeller body portion 41 described later in the pump portion 40 is connected to one axial side (-Z side) of the second resin portion 14. The second resin portion 14 and the impeller body portion 41 are part of the same single component. The impeller body portion 41 is manufactured simultaneously when the second resin portion 14 is manufactured by insert molding. In the present embodiment, the resin portion 10a is constituted by the second resin portion 14 and the impeller body portion 41. That is, the rotor 10 has a resin portion 10a. The resin portion 10a has an impeller body portion 41 as a part of the pump portion 40. The resin portion 10a is in the shape of a tube extending in the axial direction and opening on both sides in the axial direction.

[0017] The resin portion 10a is a resin portion, and at least a portion of the bearing member 80 is embedded in the resin portion 10a. In the present embodiment, the resin portion 10a embeds and holds a portion of the bearing member 80 and a portion of the molded body 15. Thus, the resin portion 10a fixes the rotor body 16 and the bearing member 80 to each other. In the present embodiment, a portion of the bearing member 80 and a portion of the molded body 15 are embedded and held in the second resin portion 14 in the resin portion 10a. The second resin portion 14 fixes the rotor body 16 and the bearing member 80 to each other.

[0018] like Figure 4 As shown, the resin portion 10a has a cylindrical open cylindrical portion 10b that is open on one axial side (-Z side). The end of the open cylindrical portion 10b on one axial side is the end of the resin portion 10a on one axial side. The open cylindrical portion 10b is roughly cylindrical around the central axis J. The impeller body portion 41 described later is connected to the radial outer side of the open cylindrical portion 10b. The open cylindrical portion 10b is located at a position closer to one axial side than the rotor body 16 and the molded body 15. The inner diameter of the open cylindrical portion 10b is larger than the inner diameter of the portion of the resin portion 10a that is connected to the other axial side (+Z side) of the open cylindrical portion 10b.

[0019] The bearing component 80 is in the shape of a cylinder extending in the axial direction and open on both sides in the axial direction. In the present embodiment, the bearing component 80 is in the shape of a substantially cylindrical cylinder surrounding the center axis J and extending in the axial direction. The fixed shaft 30 passes through the interior of the bearing component 80 in the axial direction. Thus, the rotor 10 can be stably supported so as to be rotatable by utilizing the fixed shaft 30 via the bearing component 80. The bearing component 80 is a component supported so as to be rotatable by the fixed shaft 30. The bearing component 80 is located radially inside the second resin portion 14. The outer peripheral surface of the bearing component 80 is fixed to the inner peripheral surface of the second resin portion 14. The bearing component 80 is made of, for example, resin. The bearing component 80 is open on both sides in the axial direction. As Figure 4 As shown, a step portion 86 is provided on the inner peripheral surface of the end portion on one axial side (-Z side) of the bearing component 80, and the step portion 86 has a step surface 86a facing one axial side. The step surface 86a is in a substantially annular shape around the central axis J. The step surface 86a is, for example, orthogonal to the axial direction. The inner diameter of the portion of the bearing component 80 closer to the axial side than the step surface 86a is larger than the inner diameter of the portion of the bearing component 80 provided with the step surface 86a.

[0020] The inner peripheral surface of the end portion of the other axial side (+Z side) of the bearing component 80 is an inclined surface 87. The inclined surface 87 is annular and surrounds the central axis J, and its inner diameter increases as it goes toward the other axial side. The inclined surface 87 is the same shape as the outer peripheral surface of a truncated cone whose outer diameter increases as it goes toward the other axial side.

[0021] The inner surface of the bearing component 80 is provided with a first groove portion 85a which is open on both sides in the axial direction. The first groove portion 85a extends in the axial direction. More specifically, the first groove portion 85a extends from the lower end of the inclined surface 87 to the stepped surface 86a. The end of the first groove portion 85a on the other axial side (+Z side) opens at the inclined surface 87. The end of the first groove portion 85a on one axial side (-Z side) opens at the stepped surface 86a. Figure 5 As shown, in a cross section orthogonal to the axial direction, the inner surface of the first groove portion 85a is in a semicircular arc shape that is recessed radially outward. A plurality of first groove portions 85a are provided at intervals in the circumferential direction. In the present embodiment, four first groove portions 85a are provided. In the present embodiment, a plurality of first groove portions 85a are arranged at equal intervals in a circumferential direction.

[0022] On the end surface of the axial side (-Z side) of the bearing component 80, a second groove portion 85b extending from the inner circumferential surface of the bearing component 80 to the outer circumferential surface of the bearing component 80 is provided. In the present embodiment, the second groove portion 85b extends in a straight line in the radial direction. A plurality of second groove portions 85b are provided at intervals in the circumferential direction. In the present embodiment, four second groove portions 85b are provided. In the present embodiment, a plurality of second groove portions 85b are arranged at equal intervals on a circumferential circle. The interior of the second groove 85b is directly or indirectly connected to the interior of the first groove 85a. In the present embodiment, the interior of the second groove portion 85b is indirectly connected to the interior of the first groove portion 85a via a portion of the internal space of the bearing component 80 that is closer to the axial side than the step surface 86a. In more detail, the radially inner end of the interior of the second groove portion 85b is indirectly connected to the end of the interior of the first groove portion 85a on the axial side via a portion of the internal space of the bearing component 80 that is closer to the axial side than the step surface 86a. In addition, the interior of the second groove portion 85b may be directly connected to the interior of the first groove portion 85a.

[0023] A third groove portion 85c is provided on the end surface on the other axial side (+Z side) of the bearing member 80, extending from the inner circumferential surface of the bearing member 80 to the outer circumferential surface of the bearing member 80. The third groove portion 85c is the same as the second groove portion 85b except that it is provided on the end surface on the other axial side of the bearing member 80.

[0024] The bearing component 80 has a large diameter portion 81 and a small diameter portion 82. In the present embodiment, the large diameter portion 81 and the small diameter portion 82 are roughly cylindrical in shape surrounding the central axis J. The large diameter portion 81 is connected to the small diameter portion 82 in the axial direction. In the present embodiment, the large diameter portion 81 is connected to the end portion on the other axial side (+Z side) of the small diameter portion 82. The end portion on the other axial side of the large diameter portion 81 is the end portion on the other axial side of the bearing component 80. The outer diameter of the large diameter portion 81 is larger than the outer diameter of the small diameter portion 82. The axial dimension of the large diameter portion 81 is larger than the axial dimension of the small diameter portion 82. As Figure 4 As shown in FIG. 1 , the end of the large diameter portion 81 on the other axial side is located closer to the other axial side than the end of the rotor body 16 on the other axial side, the end of the molded body 15 on the other axial side, and the end of the resin portion 10a on the other axial side. The end of the large diameter portion 81 on one axial side (-Z side) is located closer to the one axial side than the end of the rotor body 16 on one axial side and the end of the molded body 15 on one axial side. In the present embodiment, the end of the large diameter portion 81 on the other axial side is the portion of the rotor 10 that is closest to the other axial side.

[0025] The small diameter portion 82 is connected to the end of the large diameter portion 81 on one axial side (-Z side). The end of the small diameter portion 82 on one axial side is the end of the bearing component 80 on one axial side. The end of the small diameter portion 82 on one axial side is located at a position closer to the other axial side (+Z side) than the end of the resin portion 10a on one axial side. The end of the small diameter portion 82 on one axial side is located inside the open cylinder 10b. In the present embodiment, the part of the small diameter portion 82 on one axial side is located inside the open cylinder 10b. The radial outer side surface of the part of the small diameter portion 82 located inside the open cylinder 10b is arranged to be radially away from the radial inner side surface of the open cylinder 10b. The entire small diameter portion 82 is located at a position closer to the axial side than the end of the rotor body 16 on one axial side and the end of the molded body 15 on one axial side. A step portion 84 is provided between the outer peripheral surface of the large diameter portion 81 and the outer peripheral surface of the small diameter portion 82 in the axial direction. The step portion 84 is a step portion having the second surface 80b described later as a step surface facing the axial side.

[0026] like Figure 5 As shown, the bearing component 80 has a first surface 80a. The first surface 80a is the end surface on the axial side (-Z side) of the bearing component 80, that is, the end surface on the axial side of the small diameter portion 82. That is, in the present embodiment, the small diameter portion 82 has a first surface 80a. The first surface 80a is a surface facing the axial side. In the present embodiment, the first surface 80a is a surface orthogonal to the axial direction. The first surface 80a is annular around the central axis J. In more detail, the first surface 80a is roughly annular with the central axis J as the center. A plurality of second groove portions 85b are provided on the first surface 80a. The first surface 80a is divided into a plurality of parts in the circumferential direction by the plurality of second groove portions 85b.

[0027] like Figure 4 As shown, the axial position of the first surface 80a is different from the axial position of the rotor body 16. In the present embodiment, the first surface 80a is located at a position closer to the axial side than the surface on the axial side (-Z side) of the rotor body 16. In the present embodiment, the surface on the axial side of the rotor body 16 is composed of the surface on the axial side of the rotor core 11 and the surfaces on the axial side of the plurality of magnets 12. The first surface 80a is located at a position closer to the axial other side (+Z side) than the end of the axial side of the resin portion 10a. The first surface 80a is located inside the open cylindrical portion 10b and is not covered by the resin portion 10a.

[0028] The bearing component 80 has a second surface 80b facing the side toward which the first surface 80a in the axial direction faces, that is, the axial side (-Z side). In the present embodiment, the first surface 80a and the second surface 80b face the side in the axial direction where the pump portion 40 is located relative to the rotor 10. In the present embodiment, the second surface 80b is a step surface provided between the radial outer side surface of the small diameter portion 82 and the radial outer side surface of the large diameter portion 81, that is, the step surface of the step portion 84. In the present embodiment, the second surface 80b is a flat surface orthogonal to the axial direction. As Figure 5 As shown, the second surface 80 b is in an annular shape surrounding the central axis J. More specifically, the second surface 80 b is in an annular shape centered on the central axis J. The second surface 80 b is an end surface of the large diameter portion 81 on one axial side.

[0029] like Figure 4 As shown, the second surface 80b is arranged in the bearing component 80 at an axial position that becomes a portion between the rotor body 16 and the first surface 80a. In the present embodiment, the second surface 80b is located at a position closer to the axial side than the surface on the axial side (-Z side) of the rotor body 16 and closer to the axial other side (+Z side) than the first surface 80a. The second surface 80b is covered by the resin portion 10a. The resin portion 10a has a contact portion 14a as a portion in contact with the second surface 80b. The contact portion 14a is located on the axial side of the second surface 80b. The contact portion 14a is cylindrical and surrounds the small diameter portion 82. In the present embodiment, the contact portion 14a is arranged in the second resin portion 14. The radial inner side surface of the contact portion 14a contacts the radial outer side surface of the portion on the axial other side of the small diameter portion 82. The contact portion 14a is a portion connected to the axial other side of the open cylindrical portion 10b. The inner diameter of the contact portion 14a is smaller than the inner diameter of the open cylindrical portion 10b.

[0030] like Figure 5 As shown, the bearing component 80 has a protrusion 83 protruding radially outward. In the present embodiment, the protrusion 83 protrudes radially outward from the radial outer surface of the portion on the other axial side (+Z side) of the large diameter portion 81. The protrusion 83 is located at a position radially outward than the second surface 80b and the large diameter portion 81. The protrusion 83 extends in the axial direction. In the present embodiment, the shape of the protrusion 83 in the cross section orthogonal to the axial direction is a roughly semicircular shape protruding radially outward. The end of the protrusion 83 on the other axial side is located at a position closer to the axial one side (-Z side) than the end of the large diameter portion 81 on the other axial side. The end of the protrusion 83 on one axial side is located at a position closer to the axial other side than the end of the large diameter portion 81 on one axial side.

[0031] The end surface of the protrusion 83 on one axial side (-Z side) is the third surface 83a. In this embodiment, the third surface 83a is a curved surface with rounded corners. Figure 4As shown, the third surface 83a is in an arc shape that protrudes toward one side of the axial direction and radially outward in a cross section that includes the central axis J and is parallel to the axial direction. The third surface 83a is located on the other side of the axial direction (+Z side) as it moves toward the radially outward. The third surface 83a is located at a position radially outward than the second surface 80b and the large diameter portion 81. The end surface on the other side of the axial direction of the protrusion 83 is the fourth surface 83b. In the present embodiment, the fourth surface 83b is a flat surface that is orthogonal to the axial direction.

[0032] At least a portion of the protrusion 83 is located radially inside the rotor body 16. In the present embodiment, the portion of the protrusion 83 other than the end portion on the other axial side (+Z side) is located radially inside the rotor body 16. The end portion on the other axial side of the protrusion 83 is located closer to the other axial side than the end portion on the other axial side of the rotor body 16 and the end portion on the other axial side of the molded body 15. In addition, the protrusion 83 may be located entirely radially inside the rotor body 16. The end portion on one axial side (-Z side) of the protrusion 83 is located closer to the other axial side than the end portion on one axial side of the rotor body 16. At least a portion of the protrusion 83 is embedded in the resin portion 10a. Therefore, the protrusion 83 is hooked on the resin portion 10a in the circumferential direction, and the bearing component 80 can be suppressed from rotating relative to the resin portion 10a about the center axis J. In the present embodiment, the entire protrusion 83 is embedded in the resin portion 10a. In addition, only a portion of the protrusion 83 may be embedded in the resin portion 10a.

[0033] like Figure 5 As shown, a plurality of protrusions 83 are provided at intervals in the circumferential direction. The plurality of protrusions 83 are arranged at equal intervals in one circumference. For example, four protrusions 83 are provided. The four protrusions 83 are respectively arranged at the same positions as the four second grooves 85b and the four third grooves 85c in the circumferential direction.

[0034] like Figure 2 As shown, the stator 20 is located radially outside the rotor 10. The stator 20 surrounds the rotor 10. The stator 20 has a stator core 21, an insulator 22 mounted on the stator core 21, and a plurality of coils 23 mounted on the stator core 21 via the insulator 22.

[0035] The stator core 21 is located radially outside the rotor core 11 and the plurality of magnets 12, and surrounds the rotor core 11 and the plurality of magnets 12. The stator core 21 is formed, for example, by stacking a plurality of plate members in the axial direction. The plurality of plate members forming the stator core 21 are, for example, electromagnetic steel plates. At least a portion of the stator core 21 is embedded in and held in a first resin housing 60. In the present embodiment, the stator core 21 is entirely embedded in the first housing 60. Figure 3As shown, the stator core 21 includes: an annular core back 24 surrounding the rotor 10 ; a plurality of teeth 25 extending radially inward from the core back 24 ; and a protruding core portion 26 protruding radially outward from the core back 24 .

[0036] The core back 24 is in a generally annular shape with the central axis J as the center. The radial dimension between the inner circumference and the outer circumference of the core back 24, i.e., the radial thickness of the core back 24, is smaller than the circumferential dimension of the portion of the teeth 25 connected to the core back 24, i.e., the radial outer end of the teeth 25. The plurality of teeth 25 are arranged at intervals in the circumferential direction. More specifically, the plurality of teeth 25 are arranged at equal intervals in one circumference. In the present embodiment, six teeth 25 are provided.

[0037] The protruding core portion 26, when viewed in the axial direction, has a roughly trapezoidal shape whose circumferential dimension increases toward the radially outer side. In the present embodiment, the axial dimension of the protruding core portion 26 is the same as the axial dimension of the core back 24 and the axial dimension of the tooth 25. The protruding core portion 26 has a core recess 26a that is recessed radially inward from the radially outer surface of the protruding core portion 26. In the present embodiment, the core recess 26a is a groove that extends axially and is open on both sides of the axial direction. The interior of the core recess 26a is roughly rectangular when viewed in the axial direction. The core recess 26a is provided in the circumferential center portion of the radially outer surface of the protruding core portion 26. As shown in FIG. Figure 2 As shown, the portion on the other axial side (+Z side) inside the core recess 26a is filled with the resin constituting the first housing 60. The portion on the one axial side (-Z side) inside the core recess 26a is a void portion not filled with resin.

[0038] like Figure 3 As shown, a plurality of protruding core parts 26 are arranged at intervals in the circumferential direction. In the present embodiment, four protruding core parts 26 are arranged. Each protruding core part 26 is connected to a portion of the core back 24 located between the teeth 25 adjacent to each other in the circumferential direction. Therefore, even if the protruding core part 26 is provided, the flow of magnetic flux between the core back 24 and the teeth 25 can be made less obstructed. Each protruding core part 26 is connected to the central part of each circumferential direction of the portion of the core back 24 located between the teeth 25 adjacent to each other in the circumferential direction. The four protruding core parts 26 include: a pair of protruding core parts 26 arranged with one tooth 25 in the circumferential direction; and a pair of protruding core parts 26 arranged with another tooth 25 in the circumferential direction. The teeth 25 located between the pair of protruding core parts 26 in the circumferential direction and the teeth 25 located between the other pair of protruding core parts 26 in the circumferential direction are arranged with the central axis J in the radial direction. The plurality of coils 23 are respectively mounted on the plurality of teeth 25 via the insulator 22. The plurality of coils 23 are electrically connected to the substrate 90 via a conductive member (not shown).

[0039] like Figure 2 As shown, the fixed shaft 30 extends in the axial direction. In more detail, the fixed shaft 30 is in a substantially cylindrical shape extending in the axial direction with the central axis J as the center. The fixed shaft 30 is located radially inside the bearing component 80 of the rotor 10. The fixed shaft 30 passes through the radial inside of the bearing component 80 in the axial direction. The fixed shaft 30 protrudes further to both sides of the axial direction than the bearing component 80. The fixed shaft 30 is loosely fitted in the radial inside of the bearing component 80. The fixed shaft 30 supports the inner peripheral surface of the bearing component 80, thereby supporting the rotor 10 to be rotatable.

[0040] The end of the fixed shaft 30 on the other axial side (+Z side) is embedded in the axial wall portion 64a described later of the first housing 60 and is retained. The fixed shaft 30 extends from the axial wall portion 64a to one axial side (-Z side). The end of the fixed shaft 30 on one axial side is located at a position closer to the axial side than the rotor housing portion 64 described later. A pair of shaft recesses 31 arranged in the radial direction across the center axis J are provided in the portion of the fixed shaft 30 where the axial wall portion 64a is embedded. By positioning a portion of the resin constituting the axial wall portion 64a in the pair of shaft recesses 31, the fixed shaft 30 is prevented from being detached from the axial wall portion 64a.

[0041] The pump part 40 is connected to one axial side (-Z side) of the rotor 10. In the present embodiment, the pump part 40 is an impeller. When the rotor 10 rotates around the central axis J, the pump part 40 rotates around the central axis J. The pump part 40 is made of resin. The pump part 40 has an impeller body part 41, a shroud part 42 and a plurality of blade parts 43. In the present embodiment, the impeller body part 41 is connected to the end part on one axial side of the second resin part 14. The impeller body part 41 is roughly disk-shaped with the central axis J as the center. The outer diameter of the impeller body part 41 is larger than the outer diameter of the lower end part of the second resin part 14.

[0042] The shroud portion 42 is separate from the impeller body portion 41. The shroud portion 42 is arranged at intervals on one axial side (-Z side) of the impeller body portion 41. The shroud portion 42 is in the shape of a ring centered on the central axis J. The plurality of blade portions 43 are located between the impeller body portion 41 and the shroud portion 42 in the axial direction. The plurality of blade portions 43 are arranged at intervals in the circumferential direction. The ends of the plurality of blade portions 43 on one axial side are connected to the shroud portion 42. In the present embodiment, the shroud portion 42 and the plurality of blade portions 43 are part of the same single component. The ends of the plurality of blade portions 43 on the other axial side (+Z side) are in contact with the impeller body portion 41.

[0043] like Figure 1 As shown in FIG. 1 , in this embodiment, the first housing 60 is a substantially cylindrical component centered on the central axis J. Figure 2 As shown, the first housing 60 includes a rotor housing portion 64 that houses the rotor 10 therein, and a substrate housing portion 65 that houses the substrate 90 therein.

[0044] The rotor housing portion 64 is in the shape of a cylinder that surrounds the central axis J and is open on one axial side (-Z side). In the present embodiment, the rotor housing portion 64 is in the shape of a substantially cylindrical cylinder centered on the central axis J and open on one axial side. The rotor housing portion 64 includes an axial wall portion 64a and a peripheral wall portion 64b. The axial wall portion 64a is a wall portion located on the other axial side (+Z side) among the wall portions constituting the rotor housing portion 64. In the present embodiment, the axial wall portion 64a is in the shape of a circle centered on the central axis J when viewed in the axial direction. The axial wall portion 64a covers the rotor 10 from the other axial side. In the present embodiment, the axial wall portion 64a is a partition wall that separates the inside of the rotor housing portion 64 and the inside of the substrate housing portion 65 in the axial direction. The end portion on the other axial side of the fixed shaft 30 is embedded in the axial wall portion 64a. The axial wall portion 64a includes a covering portion 64c located on the other axial side of the fixed shaft 30. The covering portion 64c covers the entire other axial end surface of the fixed shaft 30. The portion of the fixed shaft 30 on the axial side closer to the portion embedded in the axial wall portion 64a is located inside the rotor housing portion 64 except for the end portion on the axial side.

[0045] The peripheral wall portion 64b is a portion of the wall portion constituting the rotor housing portion 64 that is located radially outside the rotor 10. The peripheral wall portion 64b extends from the radial outer peripheral edge portion of the axial wall portion 64a to one axial side (-Z side). The peripheral wall portion 64b is in the shape of a cylinder that surrounds the central axis J and is open to one axial side. In more detail, the peripheral wall portion 64b is in the shape of a general cylinder that is centered on the central axis J and is open to one axial side. The stator 20 is embedded in the peripheral wall portion 64b. In the present embodiment, the radial dimension between the radial inner side surface and the radial outer side surface of the peripheral wall portion 64b is larger than the axial dimension of the axial wall portion 64a.

[0046] The substrate storage portion 65 is located on the other axial side (+Z side) of the rotor storage portion 64. The substrate storage portion 65 is in the shape of a tube that surrounds the central axis J and is open on the other axial side. The wall portion located on one axial side (-Z side) among the wall portions constituting the substrate storage portion 65 is the axial wall portion 64a. A cover member 51 is fixed to the end portion on the other axial side of the substrate storage portion 65. The cover member 51 closes the opening on the other axial side of the substrate storage portion 65. Figure 1 As shown, the cover member 51 is provided with a connector portion 52 that protrudes to the other side in the axial direction.

[0047] The first housing 60 includes a large diameter housing portion 61 and a small diameter housing portion 62 connected to the other axial side (+Z side) of the large diameter housing portion 61. The end of the large diameter housing portion 61 on one axial side (-Z side) is the end of the first housing 60 on one axial side. Figure 2As shown, the end of the other axial side of the large diameter housing portion 61 is located closer to the other axial side than the end of the other axial side of the stator core 21. The large diameter housing portion 61 is composed of a portion of the peripheral wall portion 64b. The end of one axial side of the large diameter housing portion 61 is the end of one axial side of the peripheral wall portion 64b. At least a portion of the stator core 21 is embedded in the large diameter housing portion 61 and retained. In the present embodiment, the entire stator core 21 is embedded in the large diameter housing portion 61. The end of the other axial side of the small diameter housing portion 62 is the end of the other axial side of the first housing 60. The outer diameter of the small diameter housing portion 62 is smaller than the outer diameter of the large diameter housing portion 61. The small diameter housing portion 62 is composed of a portion of the peripheral wall portion 64b and a substrate storage portion 65.

[0048] The second shell 70 is located on one axial side (-Z side) of the first shell 60. The second shell 70 is fixed to the first shell 60. In the present embodiment, the second shell 70 is made of resin. The second shell 70 has: an annular bottom wall portion 71 surrounding the central axis J; and an annular wall portion 72 protruding from the radial outer edge of the bottom wall portion 71 to the other axial side (+Z side). The bottom wall portion 71 is located on one axial side of the pump portion 40. The radially outer end of the bottom wall portion 71 is located radially outward of the pump portion 40. The annular wall portion 72 is fixed to the first shell 60. The pump portion 40 is housed radially inside the annular wall portion 72.

[0049] The second shell 70 has a suction port 74a and a flow path portion 76. The suction port 74a protrudes from the radial inner edge portion of the bottom wall portion 71 to one axial side (-Z side). In the present embodiment, the suction port 74a is roughly cylindrical centered on the central axis J. The suction port 74a opens on one axial side. The flow path portion 76 is located radially outside the pump portion 40. The flow path portion 76 is arranged radially between the pump portion 40 and the annular wall portion 72. The flow path portion 76 extends circumferentially.

[0050] like Figure 1 As shown, the second housing 70 has a discharge port 74b. The discharge port 74b is in the shape of a tube extending from the annular wall portion 72 in a direction perpendicular to the axial direction. The end of the downstream side of the flow path portion 76 is connected to the discharge port 74b. When the rotor 10 rotates and the pump portion 40 rotates, water is sucked into the pump portion 40 from the suction port 74a. The water sucked into the pump portion 40 is discharged from the pump portion 40 to the outside in the radial direction, flows in the circumferential direction along the flow path portion 76, and is discharged to the outside of the pump 100 from the discharge port 74b. In addition, a portion of the water sucked from the suction port 74a also flows into the rotor housing portion 64.

[0051] like Figure 2As shown, the second housing 70 has a support portion 75 that supports the rotor 10 from one axial side (-Z side). The support portion 75 has a support body portion 75a and a plurality of legs 75b. The support body portion 75a supports the rotor 10 from one axial side via a washer 32. On the inner side of the washer 32, the fixed shaft 30 passes axially. The washer 32 contacts the end of the support body portion 75a on the other axial side (+Z side) and the end of the bearing component 80 on one axial side. The washer 32 contacts the first surface 80a. In addition, the washer 32 may not contact the first surface 80a. A plurality of legs 75b extend from the inner circumferential surface of the suction port 74a to the other axial side. The ends of the plurality of legs 75b on the other axial side are connected to the support body portion 75a.

[0052] The manufacturing method of the pump 100 of the present embodiment includes an insert molding step MP. Figure 6 As shown, the insert molding process MP is a process of placing the bearing component 80 and the rotor body 16 in the mold M, and making the resin part 10a by flowing the resin R into the mold M. In the insert molding process MP of the present embodiment, the bearing component 80 and the molded body 15 having the rotor body 16 become the embedded components. In the insert molding process MP, the bearing component 80 and the molded body 15 that become the embedded components are arranged in the mold M in a posture in which one axial side (-Z side) becomes the upper side in the vertical direction and the other axial side (+Z side) becomes the lower side in the vertical direction. In the insert molding process MP, the molded resin part 10a is molded in a posture in which one axial side (-Z side) becomes the upper side in the vertical direction and the other axial side (+Z side) becomes the lower side in the vertical direction. In addition, in the following description, the upper side in the vertical direction is simply referred to as the "upper side", and the lower side in the vertical direction is simply referred to as the "lower side".

[0053] The mold M includes a lower mold M1, an upper mold M2, and a sliding mold M3. By combining the lower mold M1, the upper mold M2, and the sliding mold M3, a mold M having a mold cavity C for molding the resin portion 10a inside is assembled. The lower mold M1 is located on the lower side of the upper mold M2. The lower mold M1 includes a lower base M1a, a column M1b extending upward from the radial center of the lower base M1a, and a side wall M1c protruding upward from the radial outer edge of the lower base M1a. The column M1b is cylindrical and extends axially with the center axis J as the center. The upper part of the column M1b is located at a position higher than the upper end of the side wall M1c. The side wall M1c is located radially outside the lower part of the column M1b and surrounds the lower part of the column M1b.

[0054] The sliding mold M3 is arranged on the upper side of the lower mold M1. In more detail, the sliding mold M3 is arranged on the upper side of the side wall portion M1c. The lower surface of the sliding mold M3 contacts the upper surface of the side wall portion M1c. A pair of sliding molds M3 are arranged opposite to each other in one direction in the radial direction. The pair of sliding molds M3 are symmetrically arranged in one direction in the radial direction and are combined with each other in the one direction. The pair of sliding molds M3 are arranged to sandwich the upper part of the column portion M1b in the one direction. The upper end of the column portion M1b is located above the upper surface of the pair of sliding molds M3.

[0055] The upper mold M2 is located on the upper side of a pair of sliding molds M3. The upper mold M2 sandwiches a pair of sliding molds M3 between the upper mold M2 and the lower mold M1 in the axial direction. The upper mold M2 has an upper base M2a and a cylindrical portion M2b. That is, in the insert molding process MP, the mold M has a cylindrical portion M2b. The upper base M2a has a hole portion M2d that penetrates the upper base M2a in the axial direction. The center axis J passes through the hole portion M2d. The hole portion M2d is circular with the center axis J as the center when viewed in the axial direction. The cylindrical portion M2b extends downward from the peripheral portion on the lower side of the hole portion M2d. The cylindrical portion M2b is cylindrical with the center axis J as the center and open on the lower side. Inside the cylindrical portion M2b, the column portion M1b passes axially. The upper end of the column portion M1b is located inside the hole portion M2d.

[0056] The mold M has a gate M2c for flowing the resin R, and the resin R flows into the mold M. In the present embodiment, the gate M2c is provided at the upper base M2a of the upper mold M2. That is, the gate M2c is provided at the portion located on the upper side of the mold M. Here, in the present embodiment, the upper side is one axial side (-Z side), which is the side to which the first surface 80a and the second surface 80b are facing. Therefore, the gate M2c is located on the side to which the second surface 80b is facing in the axial direction in the mold M. In the present embodiment, the gate M2c is located at a position radially outward of the hole portion M2d and the cylindrical portion M2b. The gate M2c is a hole that penetrates the upper base M2a in the axial direction. A plurality of gates M2c are provided at intervals in the circumferential direction.

[0057] The operator who performs the insert molding process MP sets the molded body 15 and the bearing component 80 on the lower mold M1 before assembly. The operator inserts the molded body 15 into the inside of the side wall portion M1c from the upper side, and arranges the molded body 15 on the lower base portion M1a. The molded body 15 is embedded in the side wall portion M1c. Thus, the molded body 15 is positioned in the radial direction. The operator makes the column portion M1b pass through the inside of the bearing component 80, and makes the bearing component 80 approach the lower base portion M1a from the upper side, and arranges the bearing component 80 on the lower base portion M1a. The column portion M1b is embedded on the inner side of the bearing component 80. Therefore, the bearing component 80 is positioned in the radial direction. The upper end of the column portion M1b is located above the bearing component 80.

[0058] Next, the operator sets a pair of sliding molds M3 on the upper side of the lower mold M1, and makes the pair of sliding molds M3 approach each other in one radial direction to be combined. Next, the operator moves the lower mold M1 provided with the forming body 15 and the bearing component 80 and the pair of sliding molds M3 upward to approach the upper mold M2, and combines the lower mold M1, the upper mold M2 and the sliding mold M3. Thus, the mold M having the cavity C is assembled. At this time, the upper end of the bearing component 80, that is, the upper end (axial side) of the small diameter portion 82 is engaged with the inside of the cylindrical portion M2b from the lower side. That is, in the insert molding process MP, the small diameter portion 82 is engaged with the cylindrical portion M2b. In addition, the column portion M1b passes through the cylindrical portion M2b in the axial direction, and the upper end of the column portion M1b is inserted into the hole portion M2d. In addition, the lower mold M1 , the upper mold M2 , and the slide mold M3 may be combined in any order as long as the molded body 15 and the bearing member 80 are placed on the lower mold M1 .

[0059] When the mold M is assembled, the molded body 15 and the bearing member 80 are arranged inside the mold cavity C. At this time, the first surface 80a and the second surface 80b are in a state of facing upward. In the assembled state of the mold M, the first surface 80a is located above the molded body 15 including the rotor body 16. That is, in the insert molding step MP, the axial position of the first surface 80a in the mold M is different from the axial position of the rotor body 16. In the mold M, the first surface 80a is exposed inside the cylindrical portion M2b.

[0060] In the assembled state of the mold M, the second surface 80b is located above the molded body 15 including the rotor body 16 and below the first surface 80a. That is, in the insert molding step MP, the axial position of the second surface 80b in the mold M is an axial position between the rotor body 16 and the first surface 80a. The second surface 80b is exposed in the cavity C. That is, in the insert molding step MP, the second surface 80b is exposed in the mold M. In the assembled state of the mold M, the end surface of the lower side of the cylindrical portion M2b is arranged opposite to the upper side of the second surface 80b with a gap therebetween. That is, in the insert molding step MP, the axial end surface of the cylindrical portion M2b is arranged opposite to the second surface 80b in the mold M with a gap therebetween.

[0061] When the mold M is assembled and the molded body 15 and the bearing component 80 are arranged in the cavity C, the operator or the like flows the molten resin R into the cavity C from the gate M2c. As a result, the resin R is formed into the shape of the resin portion 10a along the shape of the cavity C. When the resin R flows into the cavity C, a part of the resin R hits the second surface 80b exposed in the cavity C, that is, in the mold M from the upper side. Therefore, the bearing component 80 is subjected to a force F toward the lower side from the resin R flowing into the cavity C. Therefore, the bearing component 80 is pressed against the lower base M1a of the lower mold M1. Therefore, the axial position of the bearing component 80 can be suppressed from shifting upward, and the bearing component 80 can be positioned in the axial direction in the mold M. In addition, since the upper part of the small diameter portion 82 is embedded in the lower end of the cylindrical portion M2b, the resin R is suppressed from flowing into the cylindrical portion M2b. Therefore, the part of the small diameter portion 82 that is embedded in the cylindrical portion M2b and the first surface 80a are not covered by the resin R. In this embodiment, the open cylindrical portion 10b is formed by providing the cylindrical portion M2b. The resin R formed into the shape of the resin portion 10a is solidified in the cavity C, so that the resin portion 10a that holds the molded body 15 and the bearing member 80 is formed.

[0062] In addition, in this specification, "operators, etc." include operators who perform various operations and assembly equipment, etc. Each operation may be performed only by operators, only by assembly equipment, or by operators and assembly equipment.

[0063] According to the present embodiment, the rotor 10 has a resin portion 10a in which at least a portion of the bearing member 80 is embedded, and the rotor core 11 and the bearing member 80 are fixed to each other. The bearing member 80 has a first surface 80a as an end surface on one axial side (-Z side); and a second surface 80b facing the side in the axial direction to which the first surface 80a faces. The axial position of the first surface 80a is different from the axial position of the rotor body 16. The second surface 80b is provided in the portion where the axial position of the bearing member 80 becomes between the rotor body 16 and the first surface 80a. The resin portion 10a has a contact portion 14a as a portion in contact with the second surface 80b. Therefore, as described above, when the resin portion 10a is manufactured by insert molding, the resin R can be brought into contact with the second surface 80b in the mold M, and a force F in a direction of pressing the bearing member 80 toward the mold M can be applied to the bearing member 80. Thus, the bearing member 80 can be pressed in the axial direction by the flow of the resin R in the mold M, and the axial position deviation of the bearing member 80 can be suppressed in the process of the resin R flowing into the mold M. Therefore, the relative position deviation of the rotor body 16 and the bearing member 80 fixed to each other by the resin portion 10a can be suppressed, and the quality deviation of the rotor 10 can be suppressed.

[0064] Here, for example, in order to suppress the axial movement of the bearing component 80 in the mold M, it is considered to provide a portion on the mold M that presses the bearing component 80 from the upper side. In this case, the axial position deviation of the bearing component 80 can also be suppressed, and the quality deviation of the rotor 10 can be suppressed. However, in order to press the bearing component 80 from the upper side, it is necessary to make the axial distance between the portion of the mold M that presses the bearing component 80 from the upper side and the portion of the mold M that supports the bearing component 80 from the lower side and the axial dimension of the bearing component 80 coincide with each other with high precision. Therefore, it is necessary to improve the axial dimensional accuracy of the bearing component 80, or to provide a structure on the mold M that can absorb the axial dimensional deviation of the bearing component 80. Therefore, there is a problem that the manufacturing cost of the bearing component 80 or the manufacturing cost of the mold M increases, and the manufacturing cost of the rotor 10 increases.

[0065] In view of this problem, according to the present embodiment, as described above, only by providing the second surface 80b on the bearing member 80, it is possible to suppress the bearing member 80 from being deviated in the axial direction in the mold M. Therefore, it is not necessary to improve the dimensional accuracy of the bearing member 80 in the axial direction, nor is it necessary to provide a structure that can absorb the dimensional deviation of the bearing member 80 in the axial direction on the mold M. Therefore, it is possible to suppress the increase in the manufacturing cost of the bearing member 80 and the manufacturing cost of the mold M, and it is possible to suppress the increase in the manufacturing cost of the rotor 10. As described above, according to the present embodiment, it is possible to suppress the increase in the manufacturing cost of the rotor 10, and it is possible to suppress the occurrence of deviations in the quality of the rotor 10.

[0066] In addition, in the present embodiment, the axial position at which the second surface 80b is provided in the bearing member 80 becomes a portion between the rotor body 16 and the first surface 80a. Therefore, compared with the case where the axial position of the second surface 80b is included in the axial position of the rotor body 16, the position of the second surface 80b can be easily brought close to the portion located in the axial direction in the mold M. Specifically, in the present embodiment, the second surface 80b can be easily brought close to the upper mold M2. Thus, by providing the gate M2c in the upper mold M2, the second surface 80b can be arranged near the gate M2c. Therefore, the resin R flowing into the mold M from the gate M2c can be easily brought into proper contact with the second surface 80b, and the axial force F can be easily applied to the bearing member 80 by the resin R. Therefore, the bearing member 80 can be more appropriately suppressed from being displaced in the axial direction in the mold M, and the quality deviation of the rotor 10 can be more appropriately suppressed. In the present embodiment, in the insert molding step MP, the gate M2c into which the resin R flows into the mold M is located on the side to which the second surface 80b in the axial direction of the mold M is directed, that is, on the upper side. Therefore, in the insert molding step MP, the gate M2c is arranged at a position close to the second surface 80b, and the bearing component 80 can be more appropriately and easily subjected to the force F from the resin R via the second surface 80b.

[0067] In addition, the second surface 80b is the part that the contact portion 14a of the resin portion 10a contacts, and therefore, is easily covered and buried by the resin portion 10a. Therefore, even if the second surface 80b is provided on the bearing component 80, the adverse effect of the second surface 80b on the function of the bearing component 80 is suppressed.

[0068] In addition, according to the present embodiment, the second surface 80b is a stepped surface provided between the radially outer side surface of the small diameter portion 82 and the radially outer side surface of the large diameter portion 81. Therefore, the second surface 80b can be easily produced by producing the small diameter portion 82 having an outer diameter smaller than that of the large diameter portion 81 by, for example, cutting. In addition, since the second surface 80b can be formed into a ring shape surrounding the central axis J, the second surface 80b can be provided over the entire circumference. Thus, in the insert molding step MP, the bearing component 80 can be easily subjected to the force F from the resin R over the entire circumference via the second surface 80b.

[0069] In addition, according to the present embodiment, in the insert molding step MP, the small diameter portion 82 is fitted with the cylindrical portion M2b. In this case, in order to make the lower mold M1 and the upper mold M2 close to each other in the axial direction so that the small diameter portion 82 is fitted in the cylindrical portion M2b, it is necessary to improve the dimensional accuracy of the outer diameter of the small diameter portion 82. In this case, although it is considered to produce the small diameter portion 82 by cutting, the larger the axial dimension of the small diameter portion 82, the greater the processing cost for producing the small diameter portion 82 by cutting, and the manufacturing cost of the bearing component 80 increases. In contrast, according to the present embodiment, as described above, the axial position where the second surface 80b is set in the bearing component 80 becomes the part between the rotor body 16 and the first surface 80a. Therefore, compared with the case where the second surface 80b is set at the same axial position as the rotor body 16, the axial distance between the first surface 80a and the second surface 80b can be reduced. As a result, the axial dimension of the small diameter portion 82 can be reduced, and the processing cost for producing the small diameter portion 82 can be reduced. Therefore, it is possible to suppress an increase in the manufacturing cost of the bearing component 80, and it is possible to further suppress an increase in the manufacturing cost of the rotor 10. In addition, according to the present embodiment, in the insert molding step MP, the axial end surface of the cylindrical portion M2b is arranged opposite to the second surface 80b with a gap in the mold M. Therefore, it is possible to fit the bearing component 80 in the cylindrical portion M2b while allowing the resin R to easily and appropriately abut against the second surface 80b in the mold M.

[0070] According to the present embodiment, the resin portion 10a includes at least a portion of the pump portion 40. The first surface 80a and the second surface 80b are axially oriented toward the side where the pump portion 40 is located relative to the rotor 10. In the case where the resin portion 10a includes at least a portion of the pump portion 40, in the insert molding step MP, the rotor body 16 and the bearing member 80 are arranged in the mold M with the side (the axial side) where at least a portion of the pump portion 40 is provided in the resin portion 10a being the upper side in the vertical direction, as shown in FIG. Figure 6 As shown, the molded body 15 having the rotor body 16 and the bearing component 80 can be easily supported from the bottom by the lower mold M1. In addition, in this case, it is easy to set the gate M2c on the upper mold M2 located on the upper side in the vertical direction. Therefore, it is easy to arrange the second surface 80b toward the upper side at a position close to the gate M2c. As a result, in the insert molding step MP, the bearing component 80 can be more appropriately and easily subjected to the force F from the resin R via the second surface 80b.

[0071] In addition, according to the present embodiment, the bearing component 80 has a protrusion 83 protruding radially outward. At least a portion of the protrusion 83 is located radially inside the rotor body 16 and is embedded in the resin portion 10a. Therefore, when the resin R flows into the mold M, the resin R also hits the end surface of the axial end surface of the protrusion 83, which is the third surface 83a on the side facing the second surface 80b, from the upper side. As a result, in addition to applying a force in a direction of pressing the bearing component 80 against the mold M to the bearing component 80 via the second surface 80b, it is also possible to apply a force in a direction of pressing the bearing component 80 against the mold M to the bearing component 80 via the third surface 83a. Therefore, in the insert molding step MP, the axial displacement of the bearing component 80 in the mold M can be more appropriately suppressed. In the present embodiment, the third surface 83a is located radially outward from the second surface 80b. Therefore, in the insert molding step MP, the resin R can be easily brought into contact with the third surface 83a located vertically below the second surface 80b.

[0072] The present invention is not limited to the above-mentioned embodiments, and other structures and methods may also be adopted within the scope of the technical concept of the present invention. The first surface may be of any structure as long as it is the end surface on one axial side of the bearing component or the end surface on the other axial side of the bearing component. The second surface may be of any structure as long as it is the surface facing the side toward which the first surface in the axial direction faces. The second surface may not be a step surface. For example, a convex portion protruding radially outward may also be provided on the bearing component, and the convex portion has a second surface.

[0073] In addition, the second side may also be Figure 7 The pump 200 of the modified example shown in FIG. 2 has a second surface 280b provided on the bearing member 280. Figure 7As shown, the portion of the second surface 280b connected to the radially outer side surface of the large diameter portion 81 has rounded corners. Therefore, in the insert molding process MP, when the resin R is made to flow into the mold M, the resin R in contact with the second surface 280b can be easily flowed radially outward along the portion of the second surface 280b with rounded corners. As a result, the flow of the resin R flowing into the mold M can be suppressed from being hindered. Therefore, the resin portion 10a can be more appropriately molded. The portion of the second surface 280b connected to the radially outer side surface of the large diameter portion 81 is the radially outer portion of the second surface 280b. The radially outer portion of the second surface 280b is an arc-shaped portion protruding radially outward and on one side of the axial direction (-Z side) in a cross section containing the center axis J and parallel to the axial direction. The radially outer portion of the second surface 280b is located on the other side of the axial direction (+Z side) as it moves toward the radially outer side. The radially inner portion of the second surface 280b is a flat surface orthogonal to the axial direction. In addition, the entire second surface 280b can also have rounded corners. The other structures of the second surface 280b are the same as the other structures of the second surface 80b of the above embodiment. The other structures of the pump 200 are the same as the other structures of the pump 100 of the above embodiment.

[0074] The first surface and the second surface may face one axial side (-Z side) in the above embodiment, or may face the other axial side (+Z side). The first surface and the second surface may face the axial side opposite to the side where the rotor and the pump are located. In this case, the rotor body and the bearing component may be arranged in a manner similar to the embodiment of FIG. Figure 6 The state shown is arranged in a mold in a state opposite to that in the vertical direction, and insert molding is performed.

[0075] The bearing component may be of any shape as long as it has a first surface and a second surface and is supported by a fixed shaft so as to be rotatable. The number of protrusions provided on the bearing component is not particularly limited. The bearing component may not have a protrusion. The material constituting the bearing component is not particularly limited.

[0076] In the insert molding step MP of the above embodiment, a method of insert molding is adopted in which the molded body 15 composed of the rotor body 16 and the first resin portion 13 and the bearing component 80 are arranged in the mold M, but the method of insert molding is not limited to this method. In the insert molding step of molding the resin portion, at least the rotor body and the bearing component are arranged in the mold and insert molding is performed.

[0077] In the above-mentioned embodiment, the rotor body is a structure including a rotor core and a plurality of magnets, but the structure of the rotor body is not limited thereto. The rotor body may be composed only of the rotor core, or may be composed only of one or more magnets. For example, even in the case where the rotor body is composed only of the rotor core, the rotor may have one or more magnets in addition to the rotor core as the rotor body. In this case, for example, after the resin portion is formed by insert molding in which the rotor body, i.e., the rotor core and the bearing component are embedded components, one or more magnets may be fixed to the molded body composed of the rotor core, the bearing component, and the resin portion.

[0078] The use of the pump of the present invention is not particularly limited. The pump can be installed on any equipment. The pump can be installed on a vehicle, for example. The pump can be a pump for conveying any fluid. The pump can be an oil pump for conveying oil.

[0079] Note that the present technology can adopt the following configurations. (1) A pump, comprising: a rotor rotatable about a central axis; a fixed shaft extending in an axial direction and supporting the rotor so as to be rotatable; a stator located radially outside the rotor and surrounding the rotor; and a pump unit connected to one axial side of the rotor, the rotor comprising: a rotor body; a bearing component rotatably supported by the fixed shaft; and a resin portion in which at least a portion of the bearing component is embedded and fixes the rotor body and the bearing component to each other, the bearing component comprising: a first surface which is an end surface on one axial side or an end surface on the other axial side; and a second surface which faces the side in the axial direction to which the first surface faces, the axial position of the first surface being different from the axial position of the rotor body, the axial position of the second surface provided in the bearing component being a portion between the rotor body and the first surface, and the resin portion having a portion in contact with the second surface. (2) The pump according to (1), wherein the bearing member is in a cylindrical shape extending in the axial direction and open on both sides in the axial direction, and the fixed shaft passes through the interior of the bearing member in the axial direction. (3) A pump according to (2), wherein the bearing component comprises: a small diameter portion having the first surface; and a large diameter portion which is axially connected to the small diameter portion and has an outer diameter larger than that of the small diameter portion, and the second surface is a step surface arranged between the radial outer side surface of the small diameter portion and the radial outer side surface of the large diameter portion. (4) The pump according to (3), wherein a portion of the second surface that is connected to the radially outer side surface of the large diameter portion is rounded. (5) The pump according to any one of (1) to (4), wherein the resin portion has at least a portion of the pump portion, and the first surface and the second surface are axially oriented toward a side of the pump portion relative to the rotor. (6) The pump according to any one of (1) to (5), wherein the bearing member has a protrusion that protrudes radially outward, and at least a portion of the protrusion is located radially inside the rotor body and embedded in the resin portion. (7) A method for manufacturing a pump, the pump comprising: a rotor rotatable about a central axis; a fixed shaft extending in an axial direction and supporting the rotor so as to be rotatable; a stator located radially outside the rotor and surrounding the rotor; and a pump part connected to one axial side of the rotor, the method comprising an insert molding step, in which a bearing component rotatably supported by the fixed shaft and a rotor body are arranged in a mold, and a resin is flowed into the mold to produce a resin part, the bearing component having: a first surface which is an end surface on one axial side or an end surface on the other axial side; and a second surface which faces the side in the axial direction to which the first surface faces, in the insert molding step, the axial position of the first surface in the mold is different from the axial position of the rotor body, the axial position of the second surface in the mold is an axial position between the rotor body and the first surface, the second surface is exposed in the mold, and a gate into which the resin flows into the mold is located in the mold on the side in the axial direction to which the second surface faces. (8) A method for manufacturing a pump according to (7), wherein the bearing component is cylindrical and extends axially and is open on both axial sides, and comprises: a small diameter portion having the first surface; and a large diameter portion which is axially connected to the small diameter portion and has an outer diameter larger than that of the small diameter portion, and the second surface is a step surface arranged between the radial outer surface of the small diameter portion and the radial outer surface of the large diameter portion, and in the insert molding step, the mold has a cylindrical portion for the small diameter portion to be embedded, and the axial end surface of the cylindrical portion is arranged relative to the second surface in the mold with a gap therebetween.

[0080] The structures and methods described in this specification can be appropriately combined within the range not contradicting each other. Explanation of symbols

[0081] 10…rotor, 10a…resin portion, 16…rotor body, 20…stator, 30…fixed shaft, 40…pump portion, 80, 280…bearing component, 80a…first surface, 80b, 280b…second surface, 81…large diameter portion, 82…small diameter portion, 83…protrusion, 86a…step surface, 100, 200…pump, J…center axis line, M…mold, M2b…cylindrical portion, M2c…gate, MP…insert molding process, R…resin.

Claims

1. A pump, characterized in that: have: A rotor rotatable about a central axis; a fixed shaft extending in the axial direction and rotatably supporting the rotor; a stator located radially outside the rotor and surrounding the rotor; and a pump portion connected to one axial side of the rotor, The rotor has: Rotor body; a bearing member rotatably supported by the fixed shaft; and a resin portion in which at least a portion of the bearing component is embedded and which fixes the rotor body and the bearing component to each other, The bearing component comprises: A first surface, the first surface being an end surface on one axial side or an end surface on the other axial side; and a second surface, the second surface facing the side in the axial direction to which the first surface faces, The axial position of the first surface is different from the axial position of the rotor body, The second surface is arranged in the bearing component at an axial position between the rotor body and the first surface. The resin portion has a portion in contact with the second surface.

2. The pump according to claim 1, characterized in that The bearing component is in the shape of a tube extending in the axial direction and opening on both sides of the axial direction. The fixed shaft passes through the interior of the bearing component in the axial direction.

3. The pump according to claim 2, characterized in that The bearing component comprises: A small diameter portion having the first surface; and a large diameter portion, which is connected to the small diameter portion in the axial direction and has a larger outer diameter than the small diameter portion, The second surface is a step surface provided between a radially outer side surface of the small diameter portion and a radially outer side surface of the large diameter portion.

4. The pump according to claim 3, characterized in that A portion of the second surface connected to the radially outer side surface of the large-diameter portion has a rounded corner.

5. The pump according to any one of claims 1 to 4, characterized in that The resin portion has at least a portion of the pump portion, The first surface and the second surface face a side of the pump portion relative to the rotor in the axial direction.

6. A pump according to any one of claims 1 to 4, characterized in that The bearing component has a protrusion protruding radially outward. At least a portion of the protrusion is located radially inward of the rotor body and is embedded in the resin portion.

7. A method for manufacturing a pump, the pump comprising: a rotor rotatable about a central axis; a fixed shaft extending in an axial direction and supporting the rotor so as to be rotatable; a stator located radially outside the rotor and surrounding the rotor; and a pump part connected to one axial side of the rotor, characterized in that: The method comprises an insert molding step in which a bearing member rotatably supported by the fixed shaft and a rotor body are arranged in a mold, and a resin portion is produced by pouring a resin into the mold. The bearing component comprises: A first surface, the first surface being an end surface on one axial side or an end surface on the other axial side; and a second surface, the second surface facing the side in the axial direction to which the first surface faces, In the insert molding process, The axial position of the first surface in the mold is different from the axial position of the rotor body, The axial position of the second surface in the mold is the axial position between the rotor body and the first surface, The second surface is exposed in the mold, A gate into which the resin flows into the mold is located on the side of the mold to which the second surface faces in the axial direction.

8. The method for manufacturing a pump according to claim 7, characterized in that: The bearing component is in the shape of a tube extending in the axial direction and opening on both sides in the axial direction, and comprises: a small diameter portion having the first surface; and a large diameter portion connected to the small diameter portion in the axial direction and having an outer diameter larger than that of the small diameter portion. The second surface is a step surface provided between the radially outer side surface of the small diameter portion and the radially outer side surface of the large diameter portion. In the insert molding process, The mold has a cylindrical portion into which the small-diameter portion fits, The axial end surface of the cylindrical portion is disposed in the die to face the second surface with a gap therebetween.

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