Pump and method of manufacturing pump

Abstract

To provide a method of manufacturing a pump, the pump having a structure capable of suppressing variation in quality of a rotor while suppressing an increase in manufacturing cost of the rotor.SOLUTION: The rotor includes: a rotor main body; a bearing member rotatably supported by a fixed shaft; and a resin portion in which at least a part 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 that is an end surface on one side in an axial direction or an end surface on the other side in the axial direction; and a second surface that faces a side in the axial direction to which the first surface faces. An axial position of the first surface is different from an axial position of the rotor main body. The second surface is provided in a portion where an axial position is located between the rotor main body and the first surface in the bearing member. The resin portion has a portion in contact with the second surface.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] 2. Description of the Related Art 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 and the like are integrated by a resin support member (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-183766 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the pump described above, for example, a resin support member is produced by insert molding using the rotor body and the bearing portion as insert members. In this case, there is a problem that the bearing portion is displaced in the axial direction inside the mold during insert molding, causing variations in the quality of the manufactured rotor. In response to this, for example, if insert molding is performed while the bearing portion is held in the axial direction by the mold, it is possible to suppress the axial position of the bearing portion from being displaced inside the mold during insert molding. However, in this case, it is necessary to increase the dimensional accuracy of the bearing portion in the axial direction or provide the mold with a structure that can absorb the axial dimensional variations of the bearing portion, 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 that can suppress variations in the quality of the rotor while suppressing increases in the manufacturing costs of the rotor, and a manufacturing method for such a pump. [Means for solving the problem]

[0006] One embodiment of the pump of the present invention includes a rotor rotatable about a central axis, a fixed shaft extending in an axial direction and rotatably supporting the rotor, a stator located radially outside the rotor and surrounding the rotor, and a pump section connected to one axial side of the rotor. The rotor includes a rotor body, a bearing member rotatably supported by the fixed shaft, and a resin section in which at least a part 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 face on one axial side or an end face on the other axial side, and a second surface which faces the side to which the first surface faces in the axial direction. The axial position of the first surface is different from the axial position of the rotor body. The second surface is provided in a portion of the bearing member whose axial position is between the rotor body and the first surface. The resin section has a portion which contacts the second surface.

[0007] One aspect of the method for manufacturing a pump of the present invention is a method for manufacturing a pump including a rotor rotatable about a central axis, a fixed shaft extending in an axial direction and rotatably supporting the rotor, a stator located radially outside the rotor and surrounding the rotor, and a pump section connected to one axial side of the rotor, and includes an insert molding process in which a rotor body and a bearing member rotatably supported by the fixed shaft are placed in a mold, and a resin is poured into the mold to create a resin section. The bearing member has a first surface which is an end face on one axial side or an end face 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 process, the axial position of the first surface in the mold is different from the axial position of the rotor body, and 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 through which the resin poured into the mold flows is located on the side of the mold to which the second surface faces in the axial direction. Effect of the Invention

[0008] According to one aspect of the present invention, in a pump, it is possible to suppress an increase in manufacturing costs of a rotor while suppressing the occurrence of variations in quality of the rotor. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a pump according to one embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a pump in one embodiment, taken along line II-II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing a pump in one embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a portion of a pump in one embodiment. [Diagram 5] FIG. 5 is a perspective view showing a bearing member in one embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing a part of the procedure of the insert molding process in one embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a part of a pump according to a modification of an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In each figure, a central axis J of a pump according to an embodiment described below is virtually shown. In the following description, the axial direction of the central axis J is simply called the "axial direction", the radial direction about the central axis J is simply called the "radial direction", and the circumferential direction about the central axis J is simply called the "circumferential direction". The Z axis shown in each figure indicates the direction in which the central axis J extends. In the following description, the side opposite to the side in which the Z axis arrow points (-Z side) in the axial direction is called the "one axial side", and the side in which the Z axis arrow points (+Z side) in the axial direction is called the "other axial side". For the sake of explanation, FIG. 2 shows cross sections at different circumferential positions on both the left and right sides of the central axis J.

[0011] The pump 100 of this embodiment shown in Figures 1 and 2 is a water pump that pumps water. As shown in Figure 2, the pump 100 of this embodiment includes a rotor 10, a stator 20, a fixed shaft 30, a pump section 40, a housing 50, and a substrate 90. The housing 50 includes a first housing 60, a second housing 70, and a cover member 51, which are made of resin.

[0012] The rotor 10 is rotatable about a central axis J. The rotor 10 has a rotor core 11, a magnet 12, a first resin part 13, a second resin part 14, and a bearing member 80. As shown in FIG. 3, the rotor core 11 is annular and surrounds the central axis J. The magnet 12 is fixed to a radially outer surface of the rotor core 11. A plurality of magnets 12 are provided at intervals in the circumferential direction. In this embodiment, eight magnets 12 are provided.

[0013] In this embodiment, the rotor body 16 is configured by the rotor core 11 and the multiple magnets 12. That is, the rotor 10 has the rotor body 16. In this embodiment, the end of the rotor core 11 on one axial side (-Z side) and the ends of the multiple 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 configured by the end of the rotor core 11 on one axial side and the ends of the multiple magnets 12 on one axial side. The end of the rotor core 11 on the other axial side (+Z side) and the ends of the magnets 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 configured by the end of the rotor core 11 on the other axial side and the ends of the multiple magnets 12 on the other axial side.

[0014] The first resin part 13 has a generally cylindrical shape that surrounds the central axis J and extends in the axial direction. As shown in Fig. 2, the first resin part 13 covers the rotor body 16, i.e., the rotor core 11 and the multiple magnets 12, from the radial outside and both axial sides. The rotor body 16 is embedded in the first resin part 13. In this embodiment, the first resin part 13 is made by insert molding using the rotor body 16 as an insert member.

[0015] The second resin part 14 is substantially cylindrical and surrounds the central axis J and extends in the axial direction. The second resin part 14 is located on the radially inner side of the rotor core 11. The second resin part 14 covers the radially inner surface of the rotor core 11. The second resin part 14 has a portion that sandwiches the first resin part 13 in the axial direction. The second resin part 14 is fixed to the first resin part 13. In this embodiment, the second resin part 14 is made by insert molding using the molded body 15 and the bearing member 80 as insert members. The molded body 15 is a molded body in which the rotor main body 16 and the first resin part 13 are integrally molded by insert molding.

[0016] An impeller body 41 (described later) in the pump section 40 is connected to one axial side (-Z side) of the second resin section 14. The second resin section 14 and the impeller body 41 are part of the same single member. The impeller body 41 is made at the same time as the second resin section 14 is made by insert molding. In this embodiment, the second resin section 14 and the impeller body 41 form the resin section 10a. That is, the rotor 10 has the resin section 10a. The resin section 10a has the impeller body 41, which is part of the pump section 40. The resin section 10a is cylindrical, extending in the axial direction and opening on both axial sides.

[0017] The resin portion 10a is a portion made of resin in which at least a portion of the bearing member 80 is embedded. In this embodiment, the resin portion 10a holds a portion of the bearing member 80 and a portion of the molded body 15 embedded therein. This allows the resin portion 10a to fix the rotor body 16 and the bearing member 80 to each other. In this embodiment, a portion of the bearing member 80 and a portion of the molded body 15 are embedded and held in a second resin portion 14 of the resin portion 10a. The second resin portion 14 fixes the rotor body 16 and the bearing member 80 to each other.

[0018] As shown in FIG. 4, the resin part 10a has a cylindrical opening cylinder part 10b that opens to one axial side (-Z side). The end part of the opening cylinder part 10b on the one axial side is the end part of the resin part 10a on the one axial side. The opening cylinder part 10b is substantially cylindrical and surrounds the central axis J. The impeller body part 41, which will be described later, is connected to the radial outer surface of the opening cylinder part 10b. The opening cylinder part 10b is located on the one axial side of the rotor body 16 and the molded body 15. The inner diameter of the opening cylinder part 10b is larger than the inner diameter of the resin part 10a at a portion that is connected to the other axial side (+Z side) of the opening cylinder part 10b.

[0019] The bearing member 80 is tubular and extends in the axial direction and opens on both sides in the axial direction. In this embodiment, the bearing member 80 is substantially cylindrical and surrounds the central axis J and extends in the axial direction. The fixed shaft 30 passes through the inside of the bearing member 80 in the axial direction. This allows the fixed shaft 30 to stably support the rotor 10 rotatably via the bearing member 80. The bearing member 80 is a member that is rotatably supported by the fixed shaft 30. The bearing member 80 is located radially inside the second resin part 14. The outer peripheral surface of the bearing member 80 is fixed to the inner peripheral surface of the second resin part 14. The bearing member 80 is made of, for example, resin. The bearing member 80 opens on both sides in the axial direction. As shown in FIG. 4, a step portion 86 having a step surface 86a facing one axial side is provided on the inner peripheral surface of the end of the bearing member 80 on one axial side (-Z side). The step surface 86a is substantially annular and surrounds the central axis J. The step surface 86a is, for example, perpendicular to the axial direction. The inner diameter of a portion of the bearing member 80 that is located on one axial side of the step surface 86a is larger than the inner diameter of the portion of the bearing member 80 where the step surface 86a is provided.

[0020] The inner circumferential surface at the end portion on the other axial direction side (+Z side) of the bearing member 80 is an inclined surface 87. The inclined surface 87 is annular and surrounds the central axis J, and the inner diameter increases toward the other axial direction side. The inclined surface 87 has a shape similar to the outer circumferential surface of a truncated cone whose outer diameter increases toward the other axial direction side.

[0021] The inner surface of the bearing member 80 is provided with a first groove portion 85a that opens 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 step surface 86a. The end of the first groove portion 85a on the other axial side (+Z side) opens to the inclined surface 87. The end of the first groove portion 85a on one axial side (-Z side) opens to the step surface 86a. As shown in FIG. 5, in a cross section perpendicular to the axial direction, the inner surface of the first groove portion 85a is semicircularly arcuate and recessed radially outward. A plurality of first groove portions 85a are provided at intervals in the circumferential direction. In this embodiment, four first groove portions 85a are provided. In this embodiment, the plurality of first groove portions 85a are arranged at equal intervals around one circumference in the circumferential direction.

[0022] The end face of the bearing member 80 on one axial side (-Z side) is provided with a second groove portion 85b extending from the inner peripheral surface of the bearing member 80 to the outer peripheral surface of the bearing member 80. In this embodiment, the second groove portion 85b extends linearly in the radial direction. A plurality of second groove portions 85b are provided at intervals in the circumferential direction. In this embodiment, four second groove portions 85b are provided. In this embodiment, the plurality of second groove portions 85b are arranged at equal intervals around one circumference in the circumferential direction. The inside of the second groove portion 85b is directly or indirectly connected to the inside of the first groove portion 85a. In this embodiment, the inside of the second groove portion 85b is indirectly connected to the inside of the first groove portion 85a via a portion of the internal space of the bearing member 80 located on one axial side of the step surface 86a. More specifically, a radially inner end portion of the second groove portion 85b is indirectly connected to an end portion on one axial side of the first groove portion 85a via a portion located on one axial side of the step surface 86a in the internal space of the bearing member 80. 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 extending from the inner peripheral surface of the bearing member 80 to the outer peripheral surface of the bearing member 80 is provided in the end face on the other axial side (+Z side) of the bearing member 80. The third groove portion 85c is similar to the second groove portion 85b, except that it is provided in the end face of the bearing member 80 on the other axial side.

[0024] The bearing member 80 has a large diameter portion 81 and a small diameter portion 82. In this embodiment, the large diameter portion 81 and the small diameter portion 82 are substantially cylindrical and surround the central axis J. The large diameter portion 81 is connected to the small diameter portion 82 in the axial direction. In this embodiment, the large diameter portion 81 is connected to an 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 member 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 shown in FIG. 4, the end portion on the other axial side of the large diameter portion 81 is located on the other axial side of the end portion on the other axial side of the rotor main body 16, the end portion on the other axial side of the molded body 15, and the end portion on the other axial side of the resin portion 10a. An end portion on one axial side (-Z side) of large diameter portion 81 is located on the one axial side of the end portion on one axial side of rotor body 16 and the end portion on one axial side of molded body 15. In this embodiment, the end portion on the other axial side of large diameter portion 81 is the portion of rotor 10 that is located furthest on the other axial side.

[0025] The small diameter portion 82 is connected to an end portion on one axial side (-Z side) of the large diameter portion 81. The end portion on one axial side of the small diameter portion 82 is the end portion on one axial side of the bearing member 80. The end portion on one axial side of the small diameter portion 82 is located on the other axial side (+Z side) than the end portion on one axial side of the resin portion 10a. The end portion on one axial side of the small diameter portion 82 is located inside the opening cylinder portion 10b. In this embodiment, the portion on one axial side of the small diameter portion 82 is located inside the opening cylinder portion 10b. The radial outer side surface of the portion of the small diameter portion 82 located inside the opening cylinder portion 10b is disposed radially inwardly away from the radial inner side surface of the opening cylinder portion 10b. The entire small diameter portion 82 is located on one axial side of the end portion on one axial side of the rotor body 16 and the end portion on one axial side of the molded body 15. A step portion 84 is provided between the outer circumferential surface of the large diameter portion 81 and the outer circumferential surface of the small diameter portion 82 in the axial direction. The step portion 84 is a step portion having a second surface 80b, which will be described later, as a step surface facing one side in the axial direction.

[0026] As shown in FIG. 5, the bearing member 80 has a first surface 80a. The first surface 80a is an end surface on one axial side (-Z side) of the bearing member 80, that is, an end surface on one axial side of the small diameter portion 82. That is, in this embodiment, the small diameter portion 82 has the first surface 80a. The first surface 80a is a surface facing one axial side. In this embodiment, the first surface 80a is a surface perpendicular to the axial direction. The first surface 80a is annular surrounding the central axis J. More specifically, the first surface 80a is substantially annular about the central axis J. A plurality of second groove portions 85b are provided in the first surface 80a. The first surface 80a is divided into a plurality of portions in the circumferential direction by the plurality of second groove portions 85b.

[0027] As shown in FIG. 4, the axial position of the first surface 80a is different from the axial position of the rotor body 16. In this embodiment, the first surface 80a is located on one axial side of the surface of the rotor body 16 on one axial side (-Z side). In this embodiment, the surface on one axial side of the rotor body 16 is composed of the surface on one axial side of the rotor core 11 and the surfaces on one axial side of the multiple magnets 12. The first surface 80a is located on the other axial side (+Z side) of the end of the resin part 10a on one axial side. The first surface 80a is located inside the opening tubular part 10b and is not covered by the resin part 10a.

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

[0029] As shown in FIG. 4, the second surface 80b is provided at a portion of the bearing member 80 that is between the rotor body 16 and the first surface 80a in the axial direction. In this embodiment, the second surface 80b is located on one axial side of the surface of the rotor body 16 on one axial side (-Z side) and on the other axial side (+Z side) of the first surface 80a. The second surface 80b is covered by the resin part 10a. The resin part 10a has a contact part 14a as a part that contacts the second surface 80b. The contact part 14a is located on one axial side of the second surface 80b. The contact part 14a is cylindrical and surrounds the small diameter part 82. In this embodiment, the contact part 14a is provided on the second resin part 14. The radial inner side surface of the contact part 14a contacts the radial outer side surface of the small diameter part 82 on the other axial side. The contact part 14a is a part that connects to the other axial side of the opening tubular part 10b. The inner diameter of the contact portion 14a is smaller than the inner diameter of the opening tubular portion 10b.

[0030] As shown in FIG. 5, the bearing member 80 has a protruding portion 83 that protrudes radially outward. In this embodiment, the protruding portion 83 protrudes radially outward from the radially outer surface of the large diameter portion 81 at the other axial side (+Z side). The protruding portion 83 is located radially outward from the second surface 80b and the large diameter portion 81. The protruding portion 83 extends in the axial direction. In this embodiment, the shape of the protruding portion 83 in a cross section perpendicular to the axial direction is a substantially semicircular shape that is convex radially outward. The end portion of the protruding portion 83 on the other axial side is located closer to one axial side (-Z side) than the end portion of the large diameter portion 81 on the other axial side. The end portion of the protruding portion 83 on the one axial side is located closer to the other axial side than the end portion of the large diameter portion 81 on the one axial side.

[0031] An end face of the protruding portion 83 on one axial side (-Z side) is a third surface 83a. In this embodiment, the third surface 83a is a rounded curved surface. As shown in FIG. 4, the third surface 83a is an arc shape that is convex toward one axial side 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 toward the other axial side (+Z side) as it moves radially outward. The third surface 83a is located radially outward from the second surface 80b and the large diameter portion 81. An end face of the protruding portion 83 on the other axial side is a fourth surface 83b. In this embodiment, the fourth surface 83b is a flat surface perpendicular to the axial direction.

[0032] At least a part of the protruding portion 83 is located radially inside the rotor body 16. In this embodiment, a part of the protruding portion 83 except for the end on the other axial side (+Z side) is located radially inside the rotor body 16. The end on the other axial side of the protruding portion 83 is located on the other axial side of the end on the other axial side of the rotor body 16 and the end on the other axial side of the molded body 15. The entire protruding portion 83 may be located radially inside the rotor body 16. The end on one axial side (-Z side) of the protruding portion 83 is located on the other axial side of the end on the one axial side of the rotor body 16. At least a part of the protruding portion 83 is embedded in the resin part 10a. This allows the protruding portion 83 to be caught in the circumferential direction by the resin part 10a, and the bearing member 80 to be prevented from rotating relatively around the central axis J with respect to the resin part 10a. In this embodiment, the entire protruding portion 83 is embedded in the resin part 10a. Only a part of the protruding portion 83 may be embedded in the resin part 10a.

[0033] 5, a plurality of protruding portions 83 are provided at intervals in the circumferential direction. The plurality of protruding portions 83 are arranged at equal intervals around one circumference in the circumferential direction. For example, four protruding portions 83 are provided. The four protruding portions 83 are respectively arranged at the same positions in the circumferential direction as the four second groove portions 85b and the four third groove portions 85c.

[0034] 2, 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 attached to the stator core 21, and a plurality of coils 23 attached to the stator core 21 via the insulator 22.

[0035] The stator core 21 is located radially outside the rotor core 11 and the magnets 12, and surrounds the rotor core 11 and the magnets 12. The stator core 21 is formed, for example, by stacking a plurality of plate members in the axial direction. The plate members constituting the stator core 21 are, for example, electromagnetic steel plates. At least a portion of the stator core 21 is embedded and held in a first housing 60 made of resin. In this embodiment, the stator core 21 is entirely embedded in the first housing 60. As shown in FIG. 3, the stator core 21 has 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 substantially annular about the central axis J. The radial dimension between the inner peripheral surface and the outer peripheral surface 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 tooth 25 connected to the core back 24, i.e., the radial outer end of the tooth 25. The multiple teeth 25 are arranged at intervals in the circumferential direction. More specifically, the multiple teeth 25 are arranged at equal intervals around one circumferential turn. In this embodiment, six teeth 25 are provided.

[0037] The protruding core portion 26 is generally trapezoidal in shape with a circumferential dimension that increases toward the radially outer side when viewed in the axial direction. In this 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 teeth 25. The protruding core portion 26 has a core recess 26a recessed radially inward from the radially outer surface of the protruding core portion 26. In this embodiment, the core recess 26a is a groove that extends in the axial direction and opens on both sides in the axial direction. The inside of the core recess 26a is generally rectangular in shape when viewed in the axial direction. The core recess 26a is provided in the circumferential center of the radially outer surface of the protruding core portion 26. As shown in FIG. 2, the other axial side (+Z side) of the inside of the core recess 26a is filled with resin that constitutes the first housing 60. The one axial side (-Z side) of the inside of the core recess 26a is a void portion that is not filled with resin.

[0038] As shown in FIG. 3, a plurality of protruding core parts 26 are provided at intervals in the circumferential direction. In this embodiment, four protruding core parts 26 are provided. Each protruding core part 26 is connected to a portion of the core back 24 located between the teeth 25 adjacent in the circumferential direction. Therefore, even if the protruding core parts 26 are provided, the flow of magnetic flux between the core back 24 and the teeth 25 is not easily hindered. Each protruding core part 26 is connected to a circumferential center part of each portion of the core back 24 located between the teeth 25 adjacent in the circumferential direction. The four protruding core parts 26 include a pair of protruding core parts 26 arranged to sandwich one tooth 25 in the circumferential direction, and a pair of protruding core parts 26 arranged to sandwich another tooth 25 in the circumferential direction. The teeth 25 located between one 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 to sandwich the central axis J in the radial direction. The coils 23 are attached to the teeth 25 via insulators 22. The coils 23 are electrically connected to the substrate 90 via conductive members (not shown).

[0039] As shown in FIG. 2, the fixed shaft 30 extends in the axial direction. More specifically, the fixed shaft 30 has a generally cylindrical shape extending in the axial direction about a central axis J. The fixed shaft 30 is located radially inside the bearing member 80 of the rotor 10. The fixed shaft 30 passes through the radially inside of the bearing member 80 in the axial direction. The fixed shaft 30 protrudes on both sides in the axial direction beyond the bearing member 80. The fixed shaft 30 is gap-fitted into the radially inside of the bearing member 80. The fixed shaft 30 supports the inner circumferential surface of the bearing member 80, thereby rotatably supporting the rotor 10.

[0040] An end portion on the other axial side (+Z side) of the fixed shaft 30 is embedded and held in an axial wall portion 64a of the first housing 60, which will be described later. The fixed shaft 30 extends from the axial wall portion 64a toward one axial side (-Z side). The end portion on one axial side of the fixed shaft 30 is located on the one axial side of a rotor accommodating portion 64, which will be described later. A pair of shaft recesses 31 are provided in a portion of the fixed shaft 30 embedded in the axial wall portion 64a, and are disposed radially on either side of the central axis J. A portion of the resin constituting the axial wall portion 64a is positioned within the pair of shaft recesses 31, thereby preventing the fixed shaft 30 from coming off the axial wall portion 64a.

[0041] The pump section 40 is connected to one axial side (-Z side) of the rotor 10. In this embodiment, the pump section 40 is an impeller. When the rotor 10 rotates about the central axis J, the pump section 40 rotates about the central axis J. The pump section 40 is made of resin. The pump section 40 has an impeller main body section 41, a shroud section 42, and a plurality of blade sections 43. In this embodiment, the impeller main body section 41 is connected to an end section on one axial side of the second resin section 14. The impeller main body section 41 is substantially disc-shaped and centered on the central axis J. The outer diameter of the impeller main body section 41 is larger than the outer diameter of the lower end section of the second resin section 14.

[0042] The shroud portion 42 is separate from the impeller body portion 41. The shroud portion 42 is disposed on one axial side (-Z side) of the impeller body portion 41 with a gap therebetween. The shroud portion 42 is annular about the central axis J. The plurality of blade portions 43 are located axially between the impeller body portion 41 and the shroud portion 42. The plurality of blade portions 43 are disposed with a gap therebetween 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 this embodiment, the shroud portion 42 and the plurality of blade portions 43 are part of the same single member. 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] 1, in this embodiment, the first housing 60 is a substantially cylindrical member centered on a central axis J. As shown in Fig. 2, the first housing 60 has a rotor accommodating portion 64 that accommodates the rotor 10 therein, and a board accommodating portion 65 that accommodates the board 90 therein.

[0044] The rotor accommodating portion 64 is cylindrical and surrounds the central axis J, opening on one axial side (-Z side). In this embodiment, the rotor accommodating portion 64 is generally cylindrical and centered on the central axis J, opening on one axial side. The rotor accommodating portion 64 has 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 walls constituting the rotor accommodating portion 64. In this embodiment, the axial wall portion 64a is circular and 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 this embodiment, the axial wall portion 64a is a partition portion that axially separates the inside of the rotor accommodating portion 64 from the inside of the substrate accommodating portion 65. The end portion of the fixed shaft 30 on the other axial side is embedded in the axial wall portion 64a. The axial wall portion 64a has a covering portion 64c located on the other axial side of the fixed shaft 30. The covering portion 64c covers the entire end face on the other axial side of the fixed shaft 30. A portion of the fixed shaft 30 on one axial side of the portion embedded in the axial wall portion 64a is located inside the rotor accommodating portion 64, except for the end portion on one axial side.

[0045] The peripheral wall portion 64b is a portion of the wall portion constituting the rotor accommodating 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 tubular and surrounds the central axis J and opens to one axial side. More specifically, the peripheral wall portion 64b is substantially cylindrical and centered on the central axis J and opens to one axial side. The stator 20 is embedded in the peripheral wall portion 64b. In this embodiment, the radial dimension between the radial inner surface and the radial outer surface of the peripheral wall portion 64b is larger than the axial dimension of the axial wall portion 64a.

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

[0047] The first housing 60 has 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 the one axial side (-Z side) is the end of the first housing 60 on the one axial side. As shown in FIG. 2, the end of the large diameter housing portion 61 on the other axial side is located on the other axial side of the end of the stator core 21 on the other axial side. The large diameter housing portion 61 is formed by a part of the peripheral wall portion 64b. The end of the large diameter housing portion 61 on the one axial side is the end of the peripheral wall portion 64b on the one axial side. At least a part of the stator core 21 is embedded and held in the large diameter housing portion 61. In this embodiment, the entire stator core 21 is embedded in the large diameter housing portion 61. The end of the small diameter housing portion 62 on the other axial side is the end of the first housing 60 on the other axial side. 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 constituted by a part of the peripheral wall portion 64b and a circuit board accommodating portion 65.

[0048] The second housing 70 is located on one axial side (-Z side) of the first housing 60. The second housing 70 is fixed to the first housing 60. In this embodiment, the second housing 70 is made of resin. The second housing 70 has an annular bottom wall portion 71 surrounding the central axis J, and an annular wall portion 72 protruding from a radial outer edge portion 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. A radially outer end portion of the bottom wall portion 71 is located radially outer than the pump portion 40. The annular wall portion 72 is fixed to the first housing 60. The pump portion 40 is accommodated on the radial inner side of the annular wall portion 72.

[0049] The second housing 70 has an intake port 74a and a flow passage portion 76. The intake port 74a protrudes from a radial inner edge portion of the bottom wall portion 71 toward one axial side (-Z side). In this embodiment, the intake port 74a is substantially cylindrical and centered on the central axis J. The intake port 74a opens to one axial side. The flow passage portion 76 is located radially outside the pump portion 40. The flow passage portion 76 is provided radially between the pump portion 40 and the annular wall portion 72. The flow passage portion 76 extends in the circumferential direction.

[0050] As shown in FIG. 1, the second housing 70 has a discharge port 74b. The discharge port 74b is cylindrical and extends from the annular wall portion 72 in a direction perpendicular to the axial direction. The downstream end 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 radially outward from the pump portion 40, flows circumferentially along the flow path portion 76, and is discharged from the discharge port 74b to the outside of the pump 100. Note that a part of the water sucked from the suction port 74a also flows into the rotor accommodating portion 64.

[0051] As shown in FIG. 2, 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. The fixed shaft 30 is axially passed through the inside of the washer 32. The washer 32 contacts an end portion on the other axial side (+Z side) of the support body portion 75a and an end portion on one axial side of the bearing member 80. The washer 32 contacts the first surface 80a. Note that the washer 32 and the first surface 80a do not necessarily need to be in contact with each other. The plurality of legs 75b extend from the inner peripheral 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 described above includes an insert molding process MP. As shown in FIG. 6, the insert molding process MP is a process in which the bearing member 80 and the rotor body 16 are placed in a mold M, and the resin R is poured into the mold M to create the resin part 10a. In the insert molding process MP of the present embodiment, the bearing member 80 and the molded body 15 having the rotor body 16 are the insert members. In the insert molding process MP, the bearing member 80 and the molded body 15 that are the insert members are placed in the mold M in a position in which one axial side (-Z side) is the vertical upper side and the other axial side (+Z side) is the vertical lower side. In the insert molding process MP, the molded resin part 10a is molded in a position in which one axial side (-Z side) is the vertical upper side and the other axial side (+Z side) is the vertical lower side. In the following description, the vertical upper side is simply called the "upper side" and the vertical lower side is simply called the "lower side".

[0053] The mold M has a lower mold M1, an upper mold M2, and a slide mold M3. The lower mold M1, the upper mold M2, and the slide mold M3 are combined to assemble a mold M having a cavity C for molding the resin part 10a inside. The lower mold M1 is located below the upper mold M2. The lower mold M1 has a lower base M1a, a pillar part M1b extending upward from the radial center of the lower base M1a, and a side wall part M1c protruding upward from the radial outer edge of the lower base M1a. The pillar part M1b is a cylinder extending in the axial direction with the central axis J as the center. The upper part of the pillar part M1b is located above the upper end of the side wall part M1c. The side wall part M1c is located radially outside the lower part of the pillar part M1b and surrounds the lower part of the pillar part M1b.

[0054] The slide die M3 is disposed above the lower die M1. More specifically, the slide die M3 is disposed above the side wall portion M1c. The lower surface of the slide die M3 contacts the upper surface of the side wall portion M1c. A pair of slide dies M3 are disposed facing each other in one radial direction. The pair of slide dies M3 are disposed symmetrically in one radial direction and are assembled with each other in that direction. The pair of slide dies M3 are disposed sandwiching the upper portion of the pillar portion M1b in that direction. The upper end of the pillar portion M1b is located above the upper surface of the pair of slide dies M3.

[0055] The upper die M2 is located above the pair of slide dies M3. The upper die M2 sandwiches the pair of slide dies M3 between the lower die M1 and the upper die M2 in the axial direction. The upper die M2 has an upper base M2a and a cylindrical part M2b. That is, in the insert molding process MP, the die M has the cylindrical part M2b. The upper base M2a has a hole part M2d penetrating the upper base M2a in the axial direction. A central axis J passes through the hole part M2d. When viewed in the axial direction, the hole part M2d has a circular shape centered on the central axis J. The cylindrical part M2b extends downward from the lower peripheral part of the hole part M2d. The cylindrical part M2b has a cylindrical shape centered on the central axis J and opening to the lower side. The column part M1b passes through the inside of the cylindrical part M2b in the axial direction. The upper end part of the column part M1b is located inside the hole part M2d.

[0056] The mold M has a gate M2c through which the resin R to be poured into the mold M flows. In this embodiment, the gate M2c is provided on the upper base M2a of the upper mold M2. That is, the gate M2c is provided on a portion located on the upper side of the mold M. Here, in this 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 face. Therefore, the gate M2c is located on the side of the mold M to which the second surface 80b faces in the axial direction. In this embodiment, the gate M2c is located radially outward from 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] A worker or the like performing the insert molding process MP places the molded body 15 and the bearing member 80 in the lower mold M1 before being assembled. The worker or the like inserts the molded body 15 into the inside of the side wall portion M1c from above, and places the molded body 15 on the lower base portion M1a. The molded body 15 is fitted into the side wall portion M1c. This positions the molded body 15 in the radial direction. The worker or the like passes the column portion M1b through the inside of the bearing member 80, moves the bearing member 80 close to the lower base portion M1a from above, and places the bearing member 80 on the lower base portion M1a. The column portion M1b is fitted into the inside of the bearing member 80. This positions the bearing member 80 in the radial direction. The upper end of the column portion M1b is located above the bearing member 80.

[0058] Next, the worker etc. places a pair of slide dies M3 on the upper side of the lower die M1, and assembles the pair of slide dies M3 by moving them closer to each other in one radial direction. Next, the worker etc. moves the lower die M1 on which the molded body 15 and the bearing member 80 are placed and the pair of slide dies M3 upward, and brings them closer to the upper die M2, and assembles the lower die M1, the upper die M2, and the slide die M3. This assembles the die M having the cavity C. At this time, the upper end of the bearing member 80, that is, the upper end (one axial side) of the small diameter portion 82, is fitted into 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 fitted into the cylindrical portion M2b. Also, the column portion M1b is passed 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. After the molded body 15 and the bearing member 80 are placed on the lower die M1, the lower die M1, the upper die M2, and the slide die M3 may be combined in any order.

[0059] When the mold M is assembled, the molded body 15 and the bearing member 80 are disposed inside the cavity C. At this time, the first surface 80a and the second surface 80b face upward. When the mold M is assembled, the first surface 80a is located above the molded body 15 including the rotor body 16. That is, in the insert molding process 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 to the inside of the cylindrical portion M2b.

[0060] In a state where the mold M is assembled, 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 process 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 process MP, the second surface 80b is exposed in the mold M. In a state where the mold M is assembled, the lower end surface of the cylindrical portion M2b is disposed opposite the upper side of the second surface 80b with a gap therebetween. That is, in the insert molding process MP, the axial end surface of the cylindrical portion M2b is disposed opposite the second surface 80b with a gap therebetween in the mold M.

[0061] In a state where the mold M is assembled and the molded body 15 and the bearing member 80 are arranged in the cavity C, an operator pours the molten resin R into the cavity C from the gate M2c. As a result, the resin R is molded into the shape of the resin portion 10a along the shape of the cavity C. When the resin R is poured into the cavity C, a part of the resin R hits the second surface 80b exposed in the cavity C, i.e., in the mold M, from above. Therefore, the bearing member 80 receives a downward force F from the resin R poured into the cavity C. As a result, the bearing member 80 is pressed against the lower base portion M1a of the lower mold M1. Therefore, the axial position of the bearing member 80 can be prevented from shifting upward, and the bearing member 80 can be positioned in the mold M in the axial direction. Note that, since the upper portion of the small diameter portion 82 is fitted into the lower end portion of the cylindrical portion M2b, the resin R is prevented from flowing into the cylindrical portion M2b. Therefore, the portion of the small diameter portion 82 that is fitted into the cylindrical portion M2b and the first surface 80a are not covered with the resin R. In this embodiment, the cylindrical portion M2b is provided, thereby forming the opening cylindrical portion 10b. The resin R molded into the shape of the resin portion 10a in the cavity C is cured, thereby forming the molded body 15 and the resin portion 10a that holds the bearing member 80.

[0062] In this specification, the term "workers, etc." includes workers who perform each task and assembly equipment, etc. Each task may be performed by a worker alone, by an assembly equipment alone, or by both a worker and an assembly equipment.

[0063] According to this embodiment, the rotor 10 has a resin portion 10a in which at least a part of the bearing member 80 is embedded and which fixes the rotor core 11 and the bearing member 80 to each other. The bearing member 80 has a first surface 80a which is an end face on one axial side (-Z side) and a second surface 80b which faces 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 a portion of the bearing member 80 whose axial position is between the rotor body 16 and the first surface 80a. The resin portion 10a has a contact portion 14a as a portion that contacts the second surface 80b. Therefore, as described above, when the resin portion 10a is made by insert molding, the resin R can be applied to the second surface 80b in the mold M, and a force F can be applied to the bearing member 80 in a direction that presses the bearing member 80 against the mold M. This makes it possible to hold the bearing member 80 in the axial direction by utilizing the flow of the resin R within the mold M, and prevents the bearing member 80 from shifting in the axial position while the resin R is being poured into the mold M. This makes it possible to prevent the relative positions of the rotor body 16 and the bearing member 80, which are fixed to each other by the resin part 10a, from shifting, and prevents variations in the quality of the rotor 10.

[0064] Here, for example, in order to suppress the bearing member 80 from moving in the axial direction within the die M, it is possible to provide the die M with a portion that presses the bearing member 80 from above. Even in this case, it is possible to suppress the axial position of the bearing member 80 from shifting, and to suppress the occurrence of variations in the quality of the rotor 10. However, in order to press the bearing member 80 from above, it is necessary to accurately match the axial distance between the portion of the die M that presses the bearing member 80 from above and the portion of the die M that supports the bearing member 80 from below, and the axial dimension of the bearing member 80. Therefore, it is necessary to improve the axial dimensional accuracy of the bearing member 80, or to provide the die M with a structure that can absorb the variations in the axial dimension of the bearing member 80. Therefore, there is a problem that the manufacturing cost of the bearing member 80 or the manufacturing cost of the die M increases, and the manufacturing cost of the rotor 10 increases.

[0065] In response to this problem, according to this embodiment, as described above, simply providing the second surface 80b on the bearing member 80 can suppress the bearing member 80 from shifting in the axial direction within the mold M. Therefore, there is no need to improve the axial dimensional accuracy of the bearing member 80, and there is no need to provide the mold M with a structure capable of absorbing axial dimensional variations of the bearing member 80. This makes it possible to suppress increases in the manufacturing costs of the bearing member 80 and the mold M, and to suppress increases in the manufacturing costs of the rotor 10. As described above, according to this embodiment, it is possible to suppress variations in the quality of the rotor 10 while suppressing increases in the manufacturing costs of the rotor 10.

[0066] In addition, in this embodiment, the second surface 80b is provided in a portion of the bearing member 80 whose axial position is 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 closer to the portion of the mold M located in the axial direction. Specifically, in this embodiment, the second surface 80b can be easily brought closer to the upper mold M2. As a result, by providing the gate M2c in the upper mold M2, the second surface 80b can be disposed close to the gate M2c. Therefore, the resin R poured into the mold M from the gate M2c can be easily and suitably applied to the second surface 80b, and the resin R can easily and suitably apply the axial force F to the bearing member 80. Therefore, the bearing member 80 can be more suitably prevented from being displaced in the axial direction in the mold M, and the occurrence of variations in the quality of the rotor 10 can be more suitably prevented. In this embodiment, in the insert molding process MP, the gate M2c through which the resin R poured into the mold M flows is located on the side of the mold M facing the second surface 80b in the axial direction, i.e., on the upper side. Therefore, in the insert molding process MP, the gate M2c is disposed at a position close to the second surface 80b, and the bearing member 80 can more suitably receive the force F from the resin R via the second surface 80b.

[0067] In addition, since the second surface 80b is the portion that comes into contact with the contact portion 14a of the resin part 10a, the second surface 80b is likely to be covered and embedded in the resin part 10a. As a result, even if the second surface 80b is provided on the bearing member 80, the second surface 80b is prevented from adversely affecting the function of the bearing member 80.

[0068] According to this embodiment, the second surface 80b is a step surface provided between the radially outer surface of the small diameter portion 82 and the radially outer surface of the large diameter portion 81. Therefore, the second surface 80b can be easily formed by, for example, forming the small diameter portion 82 having a smaller outer diameter than the large diameter portion 81 by cutting or the like. In addition, since the second surface 80b can be formed in an annular shape surrounding the central axis J, the second surface 80b can be provided over the entire circumference in the circumferential direction. This makes it easier for the bearing member 80 to receive the force F from the resin R over the entire circumference in the circumferential direction via the second surface 80b in the insert molding process MP.

[0069] According to the present embodiment, the small diameter portion 82 is fitted into the cylindrical portion M2b in the insert molding process MP. In this case, in order to fit the small diameter portion 82 into the cylindrical portion M2b by bringing the lower mold M1 and the upper mold M2 closer to each other in the axial direction, it is necessary to improve the dimensional accuracy of the outer diameter of the small diameter portion 82. In this case, it is possible to make the small diameter portion 82 by cutting, but the larger the axial dimension of the small diameter portion 82 becomes, the higher the processing cost for making the small diameter portion 82 by cutting increases, and the higher the manufacturing cost of the bearing member 80 becomes. In contrast, according to the present embodiment, as described above, the second surface 80b is provided in a portion of the bearing member 80 whose axial position is between the rotor main body 16 and the first surface 80a. Therefore, the axial distance between the first surface 80a and the second surface 80b can be made smaller than when the second surface 80b is provided at the same axial position as the rotor main body 16. This allows the axial dimension of the small diameter portion 82 to be reduced, and the processing cost for making the small diameter portion 82 can be reduced. Therefore, it is possible to suppress an increase in the manufacturing cost of the bearing member 80, and further suppress an increase in the manufacturing cost of the rotor 10. Furthermore, according to this embodiment, in the insert molding process MP, the axial end face of the tubular portion M2b is disposed opposite the second surface 80b with a gap therebetween in the mold M. Therefore, it is possible to easily and suitably apply the resin R to the second surface 80b in the mold M while fitting the bearing member 80 into the tubular portion M2b.

[0070] According to the present embodiment, the resin portion 10a has at least a part of the pump portion 40. The first surface 80a and the second surface 80b face the side where the pump portion 40 is located with respect to the rotor 10 in the axial direction. When the resin portion 10a has at least a part of the pump portion 40, the rotor body 16 and the bearing member 80 are arranged in the mold M in an orientation in which the side (one axial side) of the resin portion 10a where at least a part of the pump portion 40 is provided is the upper side in the vertical direction in the insert molding process MP, so that the molded body 15 having the rotor body 16 and the bearing member 80 can be easily supported from below by the lower mold M1 as shown in FIG. 6. In addition, in this case, the gate M2c is easily provided in the upper mold M2 located on the upper side in the vertical direction. Therefore, the second surface 80b is easily arranged in a position close to the gate M2c facing upward. As a result, the bearing member 80 can more easily receive the force F from the resin R via the second surface 80b in the insert molding process MP.

[0071] Further, according to this embodiment, the bearing member 80 has a protruding portion 83 that protrudes radially outward. At least a part of the protruding portion 83 is located radially inward of the rotor body 16 and is embedded in the resin portion 10a. Therefore, when the resin R is poured into the mold M, the resin R also hits the third surface 83a, which is the end surface of the axial end surface of the protruding portion 83 facing the side where the second surface 80b faces, from above. As a result, in addition to applying a force to the bearing member 80 via the second surface 80b in a direction pressing the bearing member 80 against the mold M, a force to the bearing member 80 via the third surface 83a in a direction pressing the bearing member 80 against the mold M can also be applied. Therefore, in the insert molding process MP, it is possible to more suitably suppress the bearing member 80 from being displaced in the axial direction within the mold M. In this embodiment, since the third surface 83a is located radially outward from the second surface 80b, it is easy to apply the resin R to the third surface 83a, which is located vertically lower than the second surface 80b, during the insert molding process MP.

[0072] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The first surface may have any configuration as long as it is an end surface on one axial side of the bearing member or an end surface on the other axial side of the bearing member. The second surface may have any configuration as long as it is a surface facing the side in the axial direction to which the first surface faces. The second surface does not have to be a stepped surface. For example, the bearing member may be provided with a convex portion that protrudes radially outward, and the convex portion may have the second surface.

[0073] The second surface may have a shape similar to that of the second surface 280b provided on the bearing member 280 of the pump 200 of the modified example shown in FIG. 7. As shown in FIG. 7, the portion of the second surface 280b that is connected to the radially outer side surface of the large diameter portion 81 is rounded. Therefore, when the resin R is poured into the mold M in the insert molding process MP, the resin R that hits the second surface 280b can be easily made to flow radially outward along the rounded portion of the second surface 280b. This makes it possible to suppress the flow of the resin R poured into the mold M from being obstructed. Therefore, the resin portion 10a can be more suitably molded. The portion of the second surface 280b that is 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 shape that is convex radially outward and toward one axial side (-Z side) in a cross section that includes the central axis J and is parallel to the axial direction. The radially outer portion of the second surface 280b is located toward the other axial side (+Z side) as it moves radially outward. The radially inner portion of the second surface 280b is a flat surface perpendicular to the axial direction. The entire second surface 280b may be rounded. The other configurations of the second surface 280b are similar to the other configurations of the second surface 80b in the above-described embodiment. The other configurations of the pump 200 are similar to the other configurations of the pump 100 in the above-described embodiment.

[0074] The first and second surfaces may face one axial side (-Z side) in the above-mentioned embodiment, or may face the other axial side (+Z side). The first and second surfaces may face the side opposite to the side on which the pump section is located relative to the rotor in the axial direction. In this case, the rotor body and the bearing member may be placed in the mold in a state inverted vertically from the state shown in FIG. 6, and insert molding may be performed.

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

[0076] In the insert molding process MP of the above-described embodiment, the molded body 15 consisting of the rotor body 16 and the first resin part 13, and the bearing member 80 are placed in the mold M to perform insert molding, but the method of performing insert molding is not limited to this method. In the insert molding process for molding the resin part, it is sufficient that at least the rotor body and the bearing member are placed in the mold and insert molding is performed.

[0077] In the above-described embodiment, the rotor body includes a rotor core and a plurality of magnets, but the configuration of the rotor body is not limited to this. The rotor body may be composed of only the rotor core, or may be composed of only one or more magnets. For example, even if the rotor body is composed of only the rotor core, the rotor may have one or more magnets in addition to the rotor core, which is the rotor body. In this case, for example, after molding the resin part by insert molding using the rotor core, which is the rotor body, and the bearing member as the insert member, one or more magnets may be fixed to the molded body consisting of the rotor core, the bearing member, and the resin part.

[0078] The use of the pump to which the present invention is applied is not particularly limited. The pump may be mounted on any device. The pump may be mounted on a vehicle, for example. The pump may be a pump that pumps any fluid. The pump may be an oil pump that pumps oil.

[0079] The present technology can be configured as follows. (1) A pump comprising: a rotor rotatable about a central axis, a fixed shaft extending in the axial direction and rotatably supporting the rotor, a stator located radially outward of the rotor and surrounding the rotor, and a pump section connected to one axial side of the rotor, wherein the rotor has a rotor body, a bearing member rotatably supported by the fixed shaft, and a resin section 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 having a first surface which is an end face on one axial side or an end face on the other axial side, and a second surface which faces in the axial direction toward the side to which the first surface faces, the axial position of the first surface being different from the axial position of the rotor body, the second surface being provided in a portion of the bearing member whose axial position is between the rotor body and the first surface, and the resin section having a portion in contact with the second surface. (2) The pump according to (1), wherein the bearing member is tubular and extends in the axial direction and is open on both axial sides, and the fixed shaft is passed through the inside of the bearing member in the axial direction. (3) The pump described in (2), wherein the bearing member has a small diameter portion having the first surface, and a large diameter portion axially connected to the small diameter portion and having an outer diameter larger than that of the small diameter portion, and the second surface is a step surface provided between a radially outer surface of the small diameter portion and a radially outer surface of the large diameter portion. (4) The pump according to (3), wherein a portion of the second surface that is connected to a radially outer surface of the large diameter portion is rounded. (5) A pump described in 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 face in the axial direction toward the side where the pump portion is located relative to the rotor. (6) A pump described in 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 inward of the rotor body and embedded in the resin portion. (7) A method for manufacturing a pump including a rotor rotatable about a central axis, a fixed shaft extending in the axial direction and rotatably supporting the rotor, a stator located radially outward of the rotor and surrounding the rotor, and a pump section connected to one axial side of the rotor, the method including an insert molding process of arranging a bearing member rotatably supported by the fixed shaft and a rotor body in a mold, and creating a resin section by pouring resin into the mold, the bearing member having a first surface which is an end face on one axial side or an end face on the other axial side, and a second surface facing the side in the axial direction toward which the first surface faces, the axial position of the first surface in the mold in the insert molding process being different from the axial position of the rotor body, the axial position of the second surface in the mold being an axial position between the rotor body and the first surface, the second surface being exposed in the mold, and a gate through which the resin poured into the mold flows being located on the side of the mold toward which the second surface faces in the axial direction. (8) The method for manufacturing a pump described in (7), wherein the bearing member is cylindrical, extending in the axial direction and opening on both axial sides, and has a small diameter portion having the first surface, and a large diameter portion axially connected to the small diameter portion and having an outer diameter larger than that of the small diameter portion, and the second surface is a stepped surface provided between a radially outer surface of the small diameter portion and a radially outer surface of the large diameter portion, and in the insert molding process, the mold has a tubular portion into which the small diameter portion is fitted, and an axial end surface of the tubular portion is positioned opposite the second surface with a gap therebetween within the mold.

[0080] The configurations and methods described in this specification can be combined as appropriate within the scope of not being mutually inconsistent. [Explanation of symbols]

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

Claims

1. A rotor rotatable about a central axis; a fixed shaft extending in an axial direction and rotatably supporting the rotor; a stator positioned radially outside the rotor and surrounding the rotor; a pump portion connected to one axial side of the rotor; Equipped with The rotor is A rotor body; a bearing member rotatably supported by the fixed shaft; a resin portion 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; having The bearing member is A first surface which is an end surface on one axial side or an end surface on the other axial side; A second surface facing the side to which the first surface faces in the axial direction; having an axial position of the first surface is different from an axial position of the rotor body; the second surface is provided at a portion of the bearing member that is axially positioned between the rotor body and the first surface, The resin portion has a portion that contacts the second surface.

2. The bearing member is tubular and extends in the axial direction and is open on both axial sides.

2. The pump according to claim 1, wherein the fixed shaft is axially inserted through the bearing member.

3. The bearing member is a small diameter portion having the first surface; a large diameter portion axially connected to the small diameter portion and having an outer diameter larger than that of the small diameter portion; having The pump according to claim 2 , wherein the second surface is a stepped surface provided between a radially outer surface of the small diameter portion and a radially outer surface of the large diameter portion.

4. The pump according to claim 3 , wherein a portion of the second surface that is connected to a radially outer surface of the large diameter portion is rounded.

5. the resin portion includes at least a portion of the pump portion, The pump according to claim 1 , wherein the first surface and the second surface face a side in the axial direction where the pump portion is located relative to the rotor.

6. The bearing member has a protruding portion protruding radially outward, The pump according to claim 1 , wherein at least a part of the protrusion is located radially inside the rotor body and embedded in the resin portion.

7. A method for manufacturing a pump including a rotor rotatable about a central axis, a fixed shaft extending in an axial direction and rotatably supporting the rotor, a stator positioned radially outward of the rotor and surrounding the rotor, and a pump section connected to one axial side of the rotor, the method comprising the steps of: an insert molding process for placing a bearing member rotatably supported by the fixed shaft and a rotor body in a mold, and forming a resin part by pouring a resin into the mold; The bearing member is A first surface which is an end surface on one axial side or an end surface on the other axial side; A second surface facing the side to which the first surface faces in the axial direction; having In the insert molding process, an axial position of the first surface in the die is different from an axial position of the rotor body; an axial position of the second surface in the die is an axial position between the rotor body and the first surface, The second surface is exposed within the mold, and A gate through which the resin poured into the mold flows is located on the side of the mold toward which the second surface faces in the axial direction.

8. The bearing member is It is cylindrical and extends in the axial direction and is open on both axial sides. a small diameter portion having the first surface, and a large diameter portion axially connected to the small diameter portion and having an outer diameter larger than that of the small diameter portion, The second surface is a step surface provided between a radially outer surface of the small diameter portion and a radially outer surface of the large diameter portion, In the insert molding process, The die has a cylindrical portion into which the small diameter portion is fitted, and The method for manufacturing a pump according to claim 7 , wherein an axial end surface of the cylindrical portion is disposed in the mold opposite to the second surface with a gap therebetween.

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