pump

Abstract

We provide pumps with a highly productive structure. [Solution] The pump 100 comprises a rotor 10 rotatable about a central axis J, a stator 20 radially opposite the rotor with a gap between them, a pump section 40 connected to one axial side of the rotor, a retaining member 80 located on the other axial side of the stator, a conductive member 90 held by the retaining member, a resin housing 60 having a rotor housing section 64 that houses the rotor inside, and a substrate 95 housed inside the resin housing. The resin housing has a substrate housing section 65 located on the other axial side of the rotor housing section that houses the substrate inside. At least a part of the stator and at least a part of the retaining member are embedded in and held by the resin housing. The conductive member has an exposed portion that protrudes from the retaining member on the other axial side and is exposed inside the substrate housing section. Of the surfaces of the retaining member facing the other axial side, the portion surrounding the exposed portion is exposed inside the substrate housing section.

Description

[[Technical Field]]

[0001] The present invention relates to a pump. [[Background Art]]

[0002] Conventionally, there has been known an electric pump having a structure in which a resin casing is insert-molded using, as an insert member, a terminal member a part of which is exposed into a driver chamber that accommodates a circuit board (e.g., Patent Document 1). [[Prior Art Literature]] [[Patent Literature]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2019-183766 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] In the electric pump configured as described above, it is necessary to perform insert molding of the casing in a state where the portion of the terminal member exposed into the driver chamber is inserted into a hole provided in a mold. The size of the hole is set to such an extent that substantially no gap is formed between the hole and the inserted portion of the terminal member, in order to prevent resin from flowing into the hole. Therefore, it is difficult to insert the terminal member into the hole, and insert molding of the casing may sometimes be difficult to perform. Accordingly, the productivity of the pump may sometimes decrease.

[0005] In view of the above circumstances, an object of the present invention is to provide a pump having a structure that can improve productivity. [[Means for Solving the Problem]]

[0006] One embodiment of the pump of the present invention comprises a rotor rotatable about a central axis, a stator radially opposite to the rotor with a gap between them, a pump section connected to one axial side of the rotor, a retaining member located on the other axial side of the stator, a conductive member held by the retaining member, a resin housing having a rotor housing section that houses the rotor inside, and a substrate housed inside the resin housing. The resin housing has a substrate housing section located on the other axial side of the rotor housing section that houses the substrate inside. At least a portion of the stator and at least a portion of the retaining member are embedded in and held by the resin housing. The conductive member has an exposed portion that protrudes from the retaining member on the other axial side and is exposed inside the substrate housing section. Of the surface of the retaining member facing the other axial side, the portion surrounding the exposed portion is exposed inside the substrate housing section. [Effects of the Invention]

[0007] According to one aspect of the present invention, the productivity of pumps can be improved. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing a pump in one embodiment. [Figure 2] Figure 2 is a cross-sectional view showing a pump in one embodiment, and is the cross-sectional view taken along line II-II in Figure 3. [Figure 3] Figure 3 is a cross-sectional view showing a pump in one embodiment. [Figure 4] Figure 4 is a perspective view showing a stator core in one embodiment. [Figure 5] Figure 5 is a perspective view showing a stator, a retaining member, and a conductive member in one embodiment. [Figure 6] Figure 6 is an exploded perspective view showing a stator and conductive members in one embodiment. [Figure 7] Figure 7 is an exploded perspective view showing a part of the stator, a retaining member, and a part of the conductive member in one embodiment. [Figure 8] Figure 8 is a perspective view showing the first housing in one embodiment. [Figure 9] Figure 9 is a view from above of the inside of the substrate housing in one embodiment. [Figure 10] Figure 10 is a view of the third recess in one embodiment, seen from below. [Figure 11] Figure 11 is a perspective view showing a part of the retaining member and a conductive member in one embodiment. [Figure 12] Figure 12 is a perspective view showing a part of the retaining member in one embodiment. [Figure 13] Figure 13 is a cross-sectional view showing a part of a pump in one embodiment. [Figure 14] Figure 14 is a perspective view showing a part of a pump in one embodiment. [Figure 15] Figure 15 is a cross-sectional view showing a part of a pump in one embodiment, and shows the first through-hole and the hole portion. [Figure 16] Figure 16 is a cross-sectional view showing a part of a pump in one embodiment, and shows a protruding support portion. [Figure 17] Figure 17 is a cross-sectional view showing part of the procedure for insert molding the first housing in one embodiment. [Figure 18] Figure 18 shows a state in which the protruding portion of the stator core is supported by the support pin portion in one embodiment. [Modes for carrying out the invention]

[0009] Each figure virtually shows the central axis J in the pump of the embodiment described below. In the following description, the axial direction of the central axis J is simply referred to as the "axial direction," the radial direction centered on the central axis J is simply referred to as the "radial direction," and the circumferential direction centered on the central axis J is simply referred to as 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 of the axial direction in which the Z-axis arrow points (+Z side) is referred to as the "upper side," and the side of the axial direction opposite to the side in which the Z-axis arrow points (-Z side) is referred to as the "lower side."

[0010] In the following embodiment, the lower side corresponds to "one axial side", and the upper side corresponds to "the other axial side". Note that the terms upper side and lower side are merely used to describe the relative positional relationship of each component, and the actual arrangement relationship may be an arrangement relationship other than that indicated by these terms. In addition, for the purpose of description, FIG. 2 shows cross-sections at different circumferential positions on both the left and right sides across the central axis J. Furthermore, in the following embodiment, the radial direction corresponds to a "first direction" orthogonal to the axial direction.

[0011] The pump 100 of the present embodiment shown in FIG. 1 and FIG. 2 is a water pump that delivers water. As shown in FIG. 2, the pump 100 of the present embodiment includes a rotor 10, a stator 20, a fixed shaft 30, a pump portion 40, a housing 50, a holding member 80, a conductive member 90, a substrate 95, and an electronic component 96. The housing 50 includes a first resin housing 60, a second housing 70, and a lid member 51. That is, the pump 100 includes the first housing 60, the second housing 70, and the lid member 51. Note that in the present embodiment, the first housing 60 corresponds to a "resin housing".

[0012] The rotor 10 is rotatable about the 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 guide member 15. As shown in FIG. 3, the rotor core 11 has an annular shape surrounding the central axis J. The magnet 12 is fixed to the radially outer surface of the rotor core 11. A plurality of the magnets 12 are provided at intervals in the circumferential direction. In the present embodiment, eight magnets 12 are provided.

[0013] The first resin portion 13 has a substantially cylindrical shape that surrounds the central axis J and extends in the axial direction. As shown in FIG. 2, the first resin portion 13 covers the rotor core 11 and the plurality of magnets 12 from the radially outer side and both axial sides. The rotor core 11 and the plurality of magnets 12 are embedded in the first resin portion 13. In the present embodiment, the first resin portion 13 is manufactured by insert molding using the rotor core 11 and the plurality of magnets 12 as insert members.

[0014] The second resin portion 14 has a substantially cylindrical shape that surrounds the central axis J and extends in the axial direction. The second resin portion 14 is located radially inward of the rotor core 11. The second resin portion 14 covers the radially inner surface of the rotor core 11. The second resin portion 14 has a portion that sandwiches 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 using, as insert members, a molded body formed of the rotor core 11, the plurality of magnets 12, and the first resin portion 13 integrally molded by insert molding, and the guide member 15.

[0015] The guide member 15 has a substantially cylindrical shape that surrounds the central axis J and extends in the axial direction. The guide member 15 is located radially inward of the second resin portion 14. The outer peripheral surface of the guide member 15 is fixed to the inner peripheral surface of the second resin portion 14. The guide member 15 is made of resin, for example.

[0016] The stator 20 is radially opposed to the rotor 10 with a gap between them. More specifically, the stator 20 is radially opposed to the rotor 10 with a gap between it and a portion of the resin that constitutes the first housing 60. In this embodiment, the stator 20 is located radially outward of the rotor 10. The stator 20 surrounds the rotor 10. At least a portion of the stator 20 is embedded and held in the first housing 60. In this embodiment, the entire stator 20 is embedded in the first housing 60. The stator 20 includes 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.

[0017] The stator core 21 is located radially outward from 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 constructed, for example, by stacking a plurality of plate members in the axial direction. The plurality of plate members constituting the stator core 21 are, for example, electrical steel sheets. At least a portion of the stator core 21 is embedded and held in a resin first housing 60. In this embodiment, the entire stator core 21 is embedded in the first housing 60. As shown in Figure 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 projection 26 projecting radially outward from the core back 24.

[0018] The core back 24 is substantially annular in shape with a central axis J. The radial dimension between the inner and outer surfaces 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 radially outer end of the teeth 25. Multiple teeth 25 are arranged at intervals in the circumferential direction. More specifically, multiple teeth 25 are arranged at equal intervals along the circumference. In this embodiment, six teeth 25 are provided.

[0019] The projection 26 has a substantially trapezoidal shape, with its circumferential dimension increasing as it extends radially outward when viewed axially. As shown in Figure 4, in this embodiment, the axial dimension of the projection 26 is the same as the axial dimension of the core back 24 and the axial dimension of the teeth 25. The projection 26 has a core recess 26a that is recessed radially inward from the radially outward surface of the projection 26. In this embodiment, the core recess 26a is a groove that extends axially and opens on both sides in the axial direction. The interior of the core recess 26a is substantially rectangular when viewed axially. The core recess 26a is located in the circumferential center of the radially outward surface of the projection 26. As shown in Figure 2, the upper part of the interior of the core recess 26a is filled with the resin that constitutes the first housing 60. The lower part of the interior of the core recess 26a is a void that is not filled with resin.

[0020] As shown in Figure 4, multiple protrusions 26 are provided at intervals in the circumferential direction. In this embodiment, four protrusions 26 are provided. Each protrusion 26 is connected to a portion of the core back 24 located between adjacent teeth 25 in the circumferential direction. Therefore, even with the provision of protrusions 26, the flow of magnetic flux between the core back 24 and the teeth 25 is less likely to be obstructed. Each protrusion 26 is connected to the circumferential central portion of each portion of the core back 24 located between adjacent teeth 25 in the circumferential direction. The four protrusions 26 include a pair of protrusions 26 arranged circumferentially with one tooth 25 in between, and a pair of protrusions 26 arranged circumferentially with another tooth 25 in between. The teeth 25 located between one pair of protrusions 26 in the circumferential direction and the teeth 25 located between the other pair of protrusions 26 in the circumferential direction are arranged radially across the central axis J. Multiple coils 23 are each attached to multiple teeth 25 via insulators 22. Multiple coils 23 are electrically connected to a substrate 95 via a first conductive member 90a, which will be described later.

[0021] As shown in Figures 5 to 7, the insulator 22 has an insulator body 22a and a support portion 27. The insulator body 22a is annular in shape surrounding the central axis J. The insulator body 22a has a portion that covers the core back 24 and the multiple teeth 25 from above, and a portion that covers the core back 24 and the multiple teeth 25 from below. As shown in Figure 6, the support portion 27 is provided on the insulator body 22a. The upper end of the support portion 27 is located above the upper end of the insulator body 22a. In this embodiment, the support portion 27 is a substantially rectangular tube shape that opens upward.

[0022] Multiple support portions 27 are provided at intervals in the circumferential direction. The multiple support portions 27 include three first support portions 27a and one second support portion 27b. The first support portion 27a is the part that holds the first conductive member 90a, which will be described later. The first support portion 27a has a slit 27c that penetrates the first support portion 27a radially. The slit 27c opens upward. A lead wire 23a drawn out from the coil 23 passes through the slit 27c. The second support portion 27b is the part that holds the second conductive member 90b, which will be described later.

[0023] As shown in Figure 2, the fixed shaft 30 extends in the axial direction. More specifically, the fixed shaft 30 is substantially cylindrical in shape, extending in the axial direction with respect to the central axis J. The fixed shaft 30 is located radially inside the guide member 15 in the rotor 10. The fixed shaft 30 passes axially through the radially inside of the guide member 15. The fixed shaft 30 protrudes axially from both sides of the guide member 15. The fixed shaft 30 is gap-fitted radially inside the guide member 15. The fixed shaft 30 supports the rotor 10 so that it can rotate by supporting the inner circumferential surface of the guide member 15.

[0024] The upper end of the fixed shaft 30 is embedded in and held by the axial wall portion 64a of the first housing 60, which will be described later. The fixed shaft 30 extends downward from the axial wall portion 64a. The lower end of the fixed shaft 30 is located below the rotor housing portion 64, which will be described later. The portion of the fixed shaft 30 embedded in the axial wall portion 64a is provided with a pair of shaft recesses 31 arranged 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, which prevents the fixed shaft 30 from coming out of the axial wall portion 64a.

[0025] The pump section 40 is connected to the lower side of the rotor 10. In this embodiment, the pump section 40 is an impeller. The pump section 40 rotates around the central axis J when the rotor 10 rotates around the central axis J. The pump section 40 is made of resin. The pump section 40 has an impeller body 41, a shroud 42, and a plurality of blades 43. In this embodiment, the impeller body 41 is connected to the lower end of the second resin section 14. The second resin section 14 and the impeller body 41 are part of the same single component. The impeller body 41 is manufactured at the same time as the second resin section 14 is manufactured by insert molding. The impeller body 41 is substantially disc-shaped with the central axis J as its center. The outer diameter of the impeller body 41 is larger than the outer diameter of the lower end of the second resin section 14.

[0026] The shroud portion 42 is separate from the impeller body portion 41. The shroud portion 42 is positioned below the impeller body portion 41 at a distance. The shroud portion 42 is annular in shape with a central axis J. The multiple blade portions 43 are located between the axial direction of the impeller body portion 41 and the shroud portion 42. The multiple blade portions 43 are positioned at intervals in the circumferential direction. The lower ends of the multiple blade portions 43 are connected to the shroud portion 42. In this embodiment, the shroud portion 42 and the multiple blade portions 43 are part of the same single component. The upper ends of the multiple blade portions 43 are in contact with the impeller body portion 41.

[0027] As shown in Figures 1 and 8, in this embodiment, the first housing 60 is a substantially cylindrical member centered on the central axis J. As shown in Figure 2, the first housing 60 has a rotor housing section 64 that houses the rotor 10 and a substrate housing section 65 that houses the substrate 95.

[0028] The rotor housing 64 is cylindrical, surrounding the central axis J and opening downwards. In this embodiment, the rotor housing 64 is substantially cylindrical, with the central axis J as its center and opening downwards. The rotor housing 64 has an axial wall portion 64a and a circumferential wall portion 64b. The axial wall portion 64a is the upper wall portion of the walls constituting the rotor housing 64. In this embodiment, the axial wall portion 64a is circular in shape, centered on the central axis J, when viewed in the axial direction. The axial wall portion 64a covers the rotor 10 from above. In this 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 upper end of the fixed shaft 30 is embedded in the axial wall portion 64a.

[0029] The axial wall portion 64a is provided with a first recess 69 that is recessed downward from the upper surface of the axial wall portion 64a. In other words, the first housing 60 has a first recess 69 that is recessed downward. As shown in Figure 9, in this embodiment, the first recess 69 is an annular shape surrounding the central axis J. More specifically, the first recess 69 is an annular shape centered on the central axis J. As shown in Figure 2, the provision of the first recess 69 makes it easier to suitably reduce the wall thickness of the first housing 60. This makes it less likely for sink marks to occur when insert molding the first housing 60. In this embodiment, for example, the axial dimension of the bottom wall portion 64d located below the first recess 69 can be suitably reduced. The bottom wall portion 64d is a wall portion that separates the inside of the first recess 69 from the inside of the rotor housing portion 64 in the axial direction. The first recess 69 is located radially inward from the base portion 81 of the retaining member 80, which will be described later.

[0030] The axial wall portion 64a has a shaft holding portion 64c that holds the fixed shaft 30. The shaft holding portion 64c is the part of the axial wall portion 64a located radially inward of the first recess 69. In this embodiment, the shaft holding portion 64c is cylindrical in shape, extending axially with respect to the central axis J. The upper end of the fixed shaft 30 is embedded in the shaft holding portion 64c. The shaft holding portion 64c has a portion located above the fixed shaft 30 and covers the entire upper end face of the fixed shaft 30. The portion of the fixed shaft 30 below the portion embedded in the axial wall portion 64a is located inside the rotor housing portion 64, except for the lower end.

[0031] The peripheral wall portion 64b is the portion of the wall portion constituting the rotor housing portion 64 that is located radially outward from the rotor 10. The peripheral wall portion 64b extends downward from the radial outer peripheral edge of the axial wall portion 64a. The peripheral wall portion 64b is cylindrical, surrounding the central axis J and opening downward. More specifically, the peripheral wall portion 64b is substantially cylindrical, centered on the central axis J and opening downward. 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 greater than the axial dimension of the axial wall portion 64a.

[0032] The substrate housing section 65 is located above the rotor housing section 64. The substrate housing section 65 is cylindrical, enclosing the central axis J and opening upwards. The lower wall portion of the walls constituting the substrate housing section 65 is the axial wall portion 64a. A cover member 51 is fixed to the upper end of the substrate housing section 65. The cover member 51 closes the upper opening of the substrate housing section 65. As shown in Figure 1, the cover member 51 is provided with a connector portion 52 that protrudes upwards.

[0033] As shown in Figure 2, the substrate 95 is housed inside the substrate housing 65. Thus, the substrate 95 is housed inside the first housing 60. The substrate 95 is, for example, a printed circuit board. In this embodiment, the substrate 95 is provided with an inverter circuit that supplies power to the coil 23. The surface of the substrate 95 is oriented in the axial direction. The substrate 95 is, for example, substantially disc-shaped. The substrate 95 is supported from below by a protruding support portion 68, which will be described later.

[0034] An electronic component 96 is mounted on the substrate 95. The electronic component 96 is mounted on the lower surface of the substrate 95. The electronic component 96 is, for example, a capacitor. At least a portion of the electronic component 96 is housed inside the first recess 69. Therefore, even if the axial dimension of the electronic component 96 is large, at least a portion of the electronic component 96 can be accommodated in the first recess 69, thereby preventing the pump 100 from becoming larger in the axial direction. In this embodiment, the electronic component 96 is inserted into the first recess 69 from above, and a portion of it is housed inside the first recess 69. Note that there may be multiple electronic components 96. In this case, the multiple electronic components 96 may include electronic components of different types. Also, when there are multiple electronic components 96, "at least a portion of the electronic component 96 is housed inside the first recess 69" means that at least a portion of at least one electronic component 96 is housed inside the first recess 69.

[0035] As shown in Figure 1, the first housing 60 has a large-diameter housing portion 61 and a small-diameter housing portion 62 connected to the upper side of the large-diameter housing portion 61. The lower end of the large-diameter housing portion 61 is the lower end of the first housing 60. As shown in Figure 2, the upper end of the large-diameter housing portion 61 is located above the upper end of the stator core 21. The large-diameter housing portion 61 is composed of a part of the peripheral wall portion 64b. The lower end of the large-diameter housing portion 61 is the lower end of the peripheral wall portion 64b. 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 upper end of the small-diameter housing portion 62 is the upper end 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 part of the peripheral wall portion 64b and a substrate housing portion 65.

[0036] As shown in Figure 1, a stepped portion 63 having an upward-facing stepped surface 63a is provided between the axial direction of the large-diameter housing portion 61 and the small-diameter housing portion 62 on the radially outer surface of the first housing 60. In this embodiment, the stepped surface 63a is a plane perpendicular to the axial direction. The stepped surface 63a is substantially annular with respect to the central axis J. The stepped surface 63a is the upper end face of the portion of the upper end of the large-diameter housing portion 61 that is located radially outward from the small-diameter housing portion 62.

[0037] As shown in Figure 8, the radial outer edge of the lower surface of the first housing 60 is the first welded fixing portion 67. The first welded fixing portion 67 is the part fixed to the second housing 70 by welding. The first welded fixing portion 67 is an annular shape surrounding the central axis J. More specifically, the first welded fixing portion 67 is an annular shape centered on the central axis J.

[0038] The first housing 60 has a third recess 66a that is recessed upward from the lower surface of the first housing 60. The lower surface of the first housing 60 is the lower surface of the large-diameter housing portion 61. In other words, in this embodiment, the third recess 66a is provided on the lower surface of the large-diameter housing portion 61. The lower surface of the first housing 60 is annular with respect to the central axis J. Multiple third recesses 66a are provided at intervals in the circumferential direction. In this embodiment, four third recesses 66a are provided. In this embodiment, each third recess 66a is provided in the first welded fixing portion 67. The lower end of each third recess 66a opens into the first welded fixing portion 67.

[0039] As shown in Figures 2 and 10, each third recess 66a is positioned to overlap with the radially outer portion of each projection 26 in an axial view. As shown in Figure 10, the third recess 66a extends circumferentially in an axial view. In this embodiment, the third recess 66a is substantially rectangular in an axial view. In an axial view, the third recess 66a overlaps with the interior of the core recess 26a provided in the projection 26 and the portions of the projection 26 located on both sides of the core recess 26a in the circumferential direction. In this embodiment, the radial dimension of the third recess 66a is the same as the radial dimension of the core recess 26a. The circumferential dimension of the third recess 66a is larger than the circumferential dimension of the core recess 26a.

[0040] As shown in Figure 2, the upper end of the third recess 66a is located below the upper end of the projection 26 and above the lower end of the projection 26. The lower portion of the radially outer part of the projection 26 is located inside the upper portion of the third recess 66a. The interior of the third recess 66a includes the lower portion of the interior of the core recess 26a.

[0041] As shown in Figure 10, a portion of the outer surface of the stator core 21 is exposed inside the third recess 66a. In this embodiment, the stator core 21 has a first exposed surface 21a, a second exposed surface 21b, and a third exposed surface 21c as surfaces exposed inside the third recess 66a. In this embodiment, the first exposed surface 21a, the second exposed surface 21b, and the third exposed surface 21c are provided on the protruding portion 26. In this embodiment, the portion of the outer surface of the stator 20 excluding the first exposed surface 21a, the second exposed surface 21b, and the third exposed surface 21c is entirely covered by the resin that constitutes the first housing 60.

[0042] The first exposed surface 21a is a surface facing downward. In this embodiment, the first exposed surface 21a is provided on the lower end face of the protrusion 26. More specifically, in this embodiment, the first exposed surface 21a is the portion of the lower end face of the protrusion 26 located on both sides in the circumferential direction of the core recess 26a. In this embodiment, the first exposed surface 21a is a plane perpendicular to the axial direction.

[0043] The second exposed surface 21b is a surface facing radially outward. In this embodiment, the second exposed surface 21b is provided on the inner surface of the core recess 26a in a portion located radially inward. More specifically, the second exposed surface 21b is the lower portion of the inner surface of the core recess 26a in a portion located radially inward.

[0044] The third exposed surface 21c is a surface facing in the circumferential direction. In this embodiment, the third exposed surface 21c is provided on the inner surface of the core recess 26a, on both sides in the circumferential direction. The pair of third exposed surfaces 21c are spaced apart in the circumferential direction and face each other. The pair of third exposed surfaces 21c are each the lower portion of the inner surface of the core recess 26a, on both sides in the circumferential direction.

[0045] As shown in Figure 8, the first housing 60 has a fourth recess 66b that is recessed upward from the lower surface of the first housing 60. In this embodiment, the fourth recess 66b is annular in shape surrounding the central axis J. More specifically, the fourth recess 66b is annular in shape centered on the central axis J. The fourth recess 66b is located radially inward from the third recess 66a. The fourth recess 66b is located adjacent to the radially inward side of the first welded fixing portion 67. The upper end of the fourth recess 66b is located lower than the upper end of the third recess 66a.

[0046] The first housing 60 has a fifth recess 66c that is recessed upward from the lower surface of the first housing 60. The fifth recess 66c is located radially inward from the fourth recess 66b. The fifth recess 66c is provided on the radial inner edge of the lower surface of the first housing 60. The fifth recess 66c is annular, surrounding the central axis J. More specifically, the fifth recess 66c is an annular shape centered on the central axis J. The fifth recess 66c opens radially inward. The portion of the lower surface of the first housing 60 located radially between the fourth recess 66b and the fifth recess 66c is located above the first welded fixing portion 67.

[0047] The first housing 60 has a sixth recess 61a that recesses radially inward from the radially outer surface of the first housing 60. The sixth recess 61a is rectangular when viewed from the radially outer side. The upper end of the sixth recess 61a is provided at the upper end of the large-diameter housing portion 61 and opens upward. Multiple sixth recesses 61a are provided at intervals in the circumferential direction. Multiple sixth recesses 61a are arranged at equal intervals along the circumference. As shown in Figure 3, the sixth recesses 61a are provided at positions different from the protrusions 26 in the circumferential direction. At least one sixth recess 61a is provided on the radially outer side of the portion of the core back 24 located between adjacent protrusions 26 in the circumferential direction. By providing the sixth recess 61a, the radial thickness of the portion of the first housing 60 that covers the core back 24 located at a position different from the protrusions 26 in the circumferential direction from the radially outer side can be reduced. This makes it less likely for sink marks to occur when insert molding the first housing 60. In addition, by providing the sixth recess 61a, the weight of the first housing 60 can be reduced.

[0048] As shown in Figure 2, the second housing 70 is located below 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 projecting upward from the radially outer edge of the bottom wall portion 71. The bottom wall portion 71 is located below the pump portion 40. The radially outer end of the bottom wall portion 71 is located radially outward from the pump portion 40. The annular wall portion 72 is fixed to the first housing 60. The pump portion 40 is housed radially inside the annular wall portion 72.

[0049] The second housing 70 has an intake port 74a and a flow path portion 76. The intake port 74a protrudes downward from the radially inner edge of the bottom wall portion 71. In this embodiment, the intake port 74a is substantially cylindrical with respect to the central axis J. The intake port 74a opens downward. The flow path portion 76 is located radially outside the pump portion 40. The flow path portion 76 is provided radially between the pump portion 40 and the annular wall portion 72. The flow path portion 76 is located radially inside the third recess 66a. That is, in this embodiment, the third recess 66a is located radially outside the flow path portion 76. The third recess 66a is positioned so as not to overlap with the flow path portion 76 when viewed in the axial direction. The flow path portion 76 extends in the circumferential direction.

[0050] As shown in Figure 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 drawn into the pump portion 40 from the intake port 74a. The water drawn 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 to the outside of the pump 100 from the discharge port 74b. Some of the water drawn in from the intake port 74a also flows into the rotor housing portion 64.

[0051] As shown in Figure 2, the second housing 70 has a support portion 75 that supports the rotor 10 from below. 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 below via a washer 32. A fixing shaft 30 is passed axially through the inside of the washer 32. The washer 32 is in contact with the upper end of the support body portion 75a and the lower end of the guide member 15. The plurality of legs 75b extend upward from the inner circumferential surface of the intake port 74a. The upper ends of the plurality of legs 75b are connected to the support body portion 75a.

[0052] The second housing 70 has a second welded fixing portion 77 provided on the upper surface of the second housing 70. In this embodiment, the second welded fixing portion 77 is the groove bottom surface of an annular groove provided on the upper surface of the annular wall portion 72. The second welded fixing portion 77 is an annular shape surrounding the central axis J. More specifically, the second welded fixing portion 77 is an annular shape centered on the central axis J. The second welded fixing portion 77 is in contact with the first welded fixing portion 67. The second welded fixing portion 77 is fixed to the first welded fixing portion 67 by welding. In other words, the second welded fixing portion 77 is a welded fixing portion fixed to the first housing 60 by welding. In this embodiment, the second welded fixing portion 77 closes the lower opening of the third recess 66a. Thus, in this embodiment, the second housing 70 closes the lower opening of the third recess 66a.

[0053] The welding method for fixing the first welded fixing part 67 and the second welded fixing part 77 to each other is not particularly limited. Examples of welding methods for fixing the first welded fixing part 67 and the second welded fixing part 77 to each other include infrared welding, ultrasonic welding, laser welding, and spin welding.

[0054] As shown in Figure 2, the retaining member 80 is located above the stator 20. The retaining member 80 is supported from below by the stator 20. In this embodiment, the retaining member 80 is made of resin. At least a portion of the retaining member 80 is embedded in and held by the first housing 60. In this embodiment, almost the entire retaining member 80 is embedded in the first housing 60.

[0055] As shown in Figure 7, the retaining member 80 has a base portion 81, a first protrusion 83, and a second protrusion 88. The base portion 81 is an annular shape surrounding the central axis J. More specifically, the base portion 81 is an annular shape centered on the central axis J. As shown in Figures 11 and 12, the base portion 81 has a plate-like portion 81a with a plate surface facing axially, and a protruding edge portion 81b that protrudes downward from the radial outer edge of the plate-like portion 81a. The plate-like portion 81a and the protruding edge portion 81b are annular shapes centered on the central axis J.

[0056] As shown in Figure 7, the first protrusion 83 protrudes upward from the base 81. In this embodiment, the first protrusion 83 is a long rectangle in the direction perpendicular to the radial direction passing through the circumferential center of the first protrusion 83 when viewed in the axial direction. Multiple first protrusions 83 are provided spaced apart in the circumferential direction. The multiple first protrusions 83 consist of three first protrusions 83a and one first protrusion 83b. The three first protrusions 83a are arranged at equal intervals along the circumference. When viewed in the axial direction, the dimension of the first protrusion 83a in the direction in which it extends is larger than the dimension of the first protrusion 83b in the direction in which it extends.

[0057] The second protrusion 88 protrudes downward from the base 81. In this embodiment, the second protrusion 88 has a substantially trapezoidal shape, where the circumferential dimension decreases as it moves radially inward when viewed in the axial direction. Multiple second protrusions 88 are provided at intervals in the circumferential direction. In this embodiment, five second protrusions 88 are provided. The multiple second protrusions 88 include two or more second protrusions 88 that have different circumferential dimensions from each other. As shown in Figure 2, the second protrusions 88 are embedded in the first housing 60. Therefore, the wall thickness of the portion of the first housing 60 located above the stator 20 can be suitably reduced. This makes it less likely for sink marks to occur when insert molding the first housing 60. In this embodiment, the provision of the second protrusions 88 allows, for example, the axial dimension of the portion of the axial wall 64a located between the stator 20 and the second protrusion 88 in the axial direction to be suitably reduced.

[0058] For example, the wall thickness of the portion of the first housing 60 located above the stator 20 can be reduced by providing a recess in the first housing 60 instead of the second protrusion 88 using a mold for insert molding the first housing 60. However, in this case, when insert molding the first housing 60, it becomes necessary to precisely position a part of the mold relative to the holding member 80, which necessitates improving the dimensional accuracy of the mold and tends to increase the cost of manufacturing the first housing 60 by insert molding. In contrast, in this embodiment, the wall thickness of the portion of the first housing 60 located above the stator 20 can be reduced by the second protrusion 88 provided on the holding member 80, thus suppressing the increase in the cost of manufacturing the first housing 60 by insert molding compared to the case where a recess is provided as described above instead of the second protrusion 88.

[0059] In this embodiment, the retaining member 80 has a second recess 88a that is recessed on the lower side. The second recess 88a is recessed downward from the upper surface of the base 81. The second recess 88a is provided in a position that overlaps with the second protrusion 88 when viewed in the axial direction. Therefore, the second recess 88a makes it possible to reduce the wall thickness of the portion of the retaining member 80 that constitutes the second protrusion 88. This makes it possible to suppress the occurrence of sink marks when molding the retaining member 80 even if the second protrusion 88 is provided. In addition, the retaining member 80 can be made lighter by the second recess 88a, and the pump 100 can be made lighter. In this embodiment, the second protrusion 88 is a hollow box shape that opens upward due to the provision of the second recess 88a.

[0060] As shown in Figure 7, in this embodiment, the retaining member 80 has a first through-hole 86 that penetrates the retaining member 80 in the axial direction. In this embodiment, the first through-hole 86 penetrates the plate-shaped portion 81a of the base portion 81 in the axial direction. The first through-hole 86 is substantially rectangular in shape, elongated in a direction perpendicular to the radial direction passing through the circumferential center of the first through-hole 86 when viewed in the axial direction. Multiple first through-holes 86 are provided spaced apart in the circumferential direction. Each of the multiple first through-holes 86 is located radially outward of each of the multiple first protrusions 83. In this embodiment, each first through-hole 86 extends in the same direction as each first protrusion 83 located radially inward when viewed in the axial direction. In the first protrusions 83 and first through-holes 86 arranged radially side by side, the dimensions of the first through-hole 86 in the direction in which the first through-hole 86 extends are larger than the dimensions of the first protrusion 83 in the direction in which the first protrusion 83 extends. In this embodiment, the plurality of first through holes 86 include three first through holes 86a located radially outward of three first protrusions 83a, and one first through hole 86b located radially outward of one first protrusion 83b.

[0061] The retaining member 80 has a third through-hole 87 that penetrates the retaining member 80 in the axial direction. In this embodiment, the third through-hole 87 penetrates the plate-shaped portion 81a of the base portion 81 in the axial direction. The third through-hole 87 is circular in shape when viewed in the axial direction. The third through-hole 87 is provided in the radially inward portion of the base portion 81. The third through-hole 87 is located radially inward than the first through-hole 86. Multiple third through-holes 87 are provided at intervals in the circumferential direction. In this embodiment, three third through-holes 87 are provided.

[0062] The retaining member 80 has a fourth through-hole 84 that penetrates the retaining member 80 in the axial direction. In this embodiment, the fourth through-hole 84 penetrates the first protrusion 83 and the plate-like portion 81a of the base portion 81 in the axial direction. A fourth through-hole 84 is provided for each first protrusion 83. Each fourth through-hole 84 is slit-shaped when viewed in the axial direction, extending in the direction in which the first protrusion 83 extends. The upper surface of each first protrusion 83 is rectangular in shape when viewed in the axial direction, due to the opening of each fourth through-hole 84. The fourth through-hole 84 includes three fourth through-holes 84a that penetrate each of the three first protrusions 83a in the axial direction, and one fourth through-hole 84b that penetrates one first protrusion 83b in the axial direction. Viewed in the axial direction, the dimensions of the fourth through-hole 84a in the direction in which it extends are greater than the dimensions of the fourth through-hole 84b in the direction in which it extends.

[0063] The retaining member 80 has snap-fit ​​portions 85. The snap-fit ​​portions 85 are portions that prevent the conductive member 90 held by the retaining member 80 from coming off the retaining member 80. Multiple snap-fit ​​portions 85 are provided spaced apart in the circumferential direction. Each snap-fit ​​portion 85 protrudes downward from the edge of each first through-hole 86. The multiple snap-fit ​​portions 85 include snap-fit ​​portions 85a that protrude downward from the edges of three first through-holes 86a, and snap-fit ​​portions 85b that protrude downward from the edge of one first through-hole 86a.

[0064] As shown in Figure 12, each snap-fit ​​portion 85 has an extended portion 85c extending downward from the edge of the first through-hole 86, and a claw portion 85d protruding radially, or in a first direction, perpendicular to the axial direction from the extended portion 85c. In other words, the retaining member 80 has an extended portion 85c and a claw portion 85d. The extended portion 85c extends downward from the radially outer portion of the edge of the first through-hole 86 on the lower surface of the plate-like portion 81a. The extended portion 85c is connected to the circumferential central portion of the radially outer portion of the edge of the first through-hole 86. The extended portion 85c is a substantially rectangular plate shape with its plate surface facing radially. The extended portion 85c is elastically deformable in the radial direction, or first direction, from which the claw portion 85d protrudes. As shown in Figure 13, the lower end of the extended portion 85c is in contact with the upper end of the support portion 27. The lower end of the extended portion 85c of each snap-fit ​​portion 85 contacts the upper end of each support portion 27, thereby positioning the holding member 80 axially with respect to the stator 20 and supporting it from below by the stator 20.

[0065] In this embodiment, the claw portion 85d protrudes radially inward from approximately the axial center of the radially inward surface of the extension portion 85c. The claw portion 85d overlaps with the first through hole 86a when viewed in the axial direction. Therefore, when forming the holding member 80 using a mold, a part of the mold used to form the claw portion 85d can be removed upward through the first through hole 86a. This makes it possible to easily form the claw portion 85d using a mold. As shown in Figure 12, the claw portion 85d extends in the direction in which the first through hole 86a, which overlaps it in the axial direction, extends. The upper surface of the claw portion 85d is a flat surface perpendicular to the axial direction. The lower surface of the claw portion 85d is an inclined surface that is located upward as it moves radially inward.

[0066] The retaining member 80 has a conductive member retaining portion 89 for holding the conductive member 90. As shown in Figure 5, multiple conductive member retaining portions 89 are provided at intervals in the circumferential direction. Each conductive member retaining portion 89 is provided with one first through hole 86, one fourth through hole 84, and one snap-fit ​​portion 85. In this embodiment, four conductive member retaining portions 89 are provided. In each conductive member retaining portion 89 and the conductive member 90 held by each conductive member retaining portion 89, the direction perpendicular to both the axial direction and the radial direction passing through the circumferential center of the conductive member retaining portion 89 is called the width direction D, and is shown as the D-axis in Figures 11, 12, 14, and 15. The width direction D is the direction in which the first through hole 86, the fourth through hole 84, and the claw portion 85d extend when viewed in the axial direction. In this embodiment, the width direction D corresponds to the "second direction" perpendicular to both the axial direction and the radial direction (first direction). In this embodiment, the width direction D is approximately the circumferential direction.

[0067] As shown in Figure 5, the conductive member 90 is held by the holding member 80. The conductive member 90 is made of metal. In this embodiment, the conductive member 90 is a sheet metal member. In this embodiment, a plurality of conductive members 90 are provided at intervals in the circumferential direction. Each conductive member 90 is held by each conductive member holding part 89. The plurality of conductive members 90 include a first conductive member 90a and a second conductive member 90b. In this embodiment, three first conductive members 90a are provided. One second conductive member 90b is provided.

[0068] The first conductive member 90a is a conductive member 90 electrically connected to the coil 23. In this embodiment, the first conductive member 90a electrically connects the coil 23 and the substrate 95. As shown in Figure 11, the first conductive member 90a has a first portion 91, a second portion 92, and a third portion 93. The first portion 91 is the portion having an exposed portion 97a, which will be described later. The first portion 91 has an insertion portion 91a and a terminal portion 91b. The insertion portion 91a is a substantially rectangular plate shape with its plate surface facing radially. The insertion portion 91a is inserted into the fourth through hole 84a from below and penetrates the base portion 81 in the axial direction. The insertion portion 91a is, for example, lightly press-fitted into the fourth through hole 84a. As shown in Figure 13, the upper end of the insertion portion 91a protrudes upward from the first convex portion 83a.

[0069] The terminal portion 91b extends upward from the upper end of the insertion portion 91a. The terminal portion 91b is passed axially through a hole 95a provided in the substrate 95. As shown in Figure 11, a pair of terminal portions 91b are provided spaced apart in the width direction D. Each terminal portion 91b has a press-fit portion 91c that bulges in the width direction D. The press-fit portion 91c is provided in the axial center of the terminal portion 91b. The press-fit portion 91c is provided with a hole 91d that penetrates the press-fit portion 91c radially. The press-fit portion 91c is elastically deformable in a direction that crushes the hole 91d. In this embodiment, the terminal portion 91b is fixed to the substrate 95 by press-fitting the press-fit portion 91c into the hole 95a. The terminal portion 91b is a press-fit terminal.

[0070] The second part 92 is the part connected to the coil 23. The radial position of the second part 92 is different from the radial position of the first part 91. In this embodiment, the second part 92 is located radially outward from the first part 91. The second part 92 is located below the first through hole 86a. The second part 92 has a supported part 92a, a connecting part 92b, and a pair of flange parts 92c. The supported part 92a is plate-shaped with its plate surface facing radially. The supported part 92a is provided with a second through hole 92d that penetrates the supported part 92a radially. In other words, the second part 92 has a second through hole 92d that penetrates the second part 92 radially. The second through hole 92d is substantially rectangular in shape, with the width D being longer when viewed radially. The claw part 85d is inserted into the second through hole 92d from the radially outward side. The upper surface of the claw portion 85d faces axially the upper portion of the inner edge of the second through hole 92d. In this embodiment, the claw portion 85d is hooked onto the first conductive member 90a from below by hooking onto the inner edge of the second through hole 92d from below.

[0071] The pair of flange portions 92c protrude from the supported portion 92a in the width direction D. The pair of flange portions 92c are positioned to sandwich the lower portion of the supported portion 92a in the width direction D. The pair of flange portions 92c are in the shape of a substantially rectangular plate with their plate surfaces facing radially.

[0072] The connecting portion 92b extends downward from the supported portion 92a. The connecting portion 92b is plate-shaped with its surface facing radially. In this embodiment, the connecting portion 92b is a rectangular plate-shaped structure extending axially. The width dimension D of the connecting portion 92b is smaller than the width dimension D of the supported portion 92a. As shown in Figure 13, the connecting portion 92b is inserted into the first support portion 27a from above. The connecting portion 92b is in contact with the lead wire 23a within the first support portion 27a. As a result, the first conductive member 90a is electrically connected to the coil 23.

[0073] The third portion 93 is a portion that protrudes radially (first direction) from the first portion 91 and connects to the second portion. In this embodiment, the third portion 93 protrudes radially outward from the lower end of the insertion portion 91a and connects to the upper end of the supported portion 92a. As shown in Figure 11, the third portion 93 is plate-shaped with its plate surface facing axially. More specifically, the third portion 93 is a substantially rectangular plate shape that is long in the width direction D. The third portion 93 is positioned opposite the first through hole 86a with a gap between them below.

[0074] The second conductive member 90b is a conductive member 90 that contacts the stator core 21. As shown in Figure 6, the second conductive member 90b has a first portion 94a, a second portion 94b, and a third portion 94c. Unlike the first portion 91 of the first conductive member 90a, the first portion 94a has only one terminal portion 94d. The terminal portion 94d has the same shape as the terminal portion 91b of the first portion 91. The terminal portion 94d is a press-fit terminal and is connected to the substrate 95 in the same way as the terminal portion 91b. The terminal portion 94d is electrically connected to a ground portion provided on the substrate 95. The other configurations of the first portion 94a are the same as the other configurations of the first portion 91.

[0075] The connector 94e in the second part 94b is inserted into the second support part 27b from above. The connector 94e passes through the inside of the second support part 27b and is inserted from above into a hole (not shown) provided in the stator core 21. As a result, the connector 94e is in contact with the stator core 21. By the contact of the connector 94e with the stator core 21, the second conductive member 90b electrically connects the ground portion provided on the substrate 95 to the stator core 21. This makes it easier to stabilize the reference potential of the ground portion provided on the substrate 95. The connector 94e is, for example, a press-fit terminal. The other configurations of the second part 94b are the same as the other configurations of the second part 92. The third part 94c is the same as the third part 93.

[0076] As shown in Figure 13, in this embodiment, a part of the retaining member 80 and a part of the conductive member 90 are exposed inside the substrate housing 65. The first conductive member 90a has an exposed portion 97a that protrudes upward from the retaining member 80 and is exposed inside the substrate housing 65. The exposed portion 97a is composed of a portion of the insertion portion 91a that protrudes upward above the first protrusion 83a and a pair of terminal portions 91b. As shown in Figure 9, the second conductive member 90b has an exposed portion 97b that protrudes upward from the retaining member 80 and is exposed inside the substrate housing 65. The exposed portion 97b is the same as the exposed portion 97a, except that it has one terminal portion 94d. In the following description, unless otherwise distinguished, the exposed portions 97a and 97b will be collectively referred to as the exposed portion 97. In this embodiment, the exposed portions 97 of the multiple conductive members 90 protrude upward from each of the multiple first protrusions 83.

[0077] The retaining member 80 has an upper-facing surface on the base 81, excluding the radial outer edge, and a plurality of first protrusions 83, which are exposed inside the substrate housing 65. As a result, the portion of the upper-facing surface of the retaining member 80 surrounding the exposed portion 97 is exposed inside the substrate housing 65. In this embodiment, the upper-facing surface of the retaining member 80 includes the upper surface of the base 81 and the upper surfaces of the plurality of first protrusions 83. In this embodiment, the portion of the upper-facing surface of the retaining member 80 surrounding the exposed portion 97 includes the upper surface of the first protrusions 83 and the portion of the upper-facing surface of the base 81 surrounding the first protrusions 83. As a result, the portion of the upper-facing surface of the base 81 surrounding the first protrusions 83 is exposed inside the substrate housing 65.

[0078] The portion of the base portion 81 facing upward, excluding the radial outer edge, that is, the portion exposed inside the substrate housing portion 65, is the exposed surface 81c exposed inside the substrate housing portion 65. In other words, the upward-facing surface of the base portion 81 has an exposed surface 81c. The exposed surface 81c surrounds the central axis J. In this embodiment, the exposed surface 81c is substantially annular with respect to the central axis J. The exposed surface 81c is a surface perpendicular to the axial direction. The exposed surface 81c includes portions that surround each of the multiple first protrusions 83.

[0079] As shown in Figures 13 and 14, the first through-hole 86 provided in the base portion 81 is exposed inside the substrate housing portion 65. The upper end of the first through-hole 86 opens to the exposed surface 81c. Below the first through-hole 86, there is a hole 64e provided in the first housing 60. In other words, the first housing 60 has a hole 64e. The hole 64e is connected to the lower side of the first through-hole 86. The hole 64e is a hole that is recessed downward from the upper surface of the axial wall portion 64a of the first housing 60 and has a bottom on the lower side. As shown in Figure 15, at least a portion of the upper surface 93a of the third portion 93, which faces upward, and at least a portion of the side surface 93b of the third portion 93, which faces the width direction D, are exposed inside the hole 64e. In this embodiment, the radially outer portion of the upper surface 93a and the radially outer portions of the side surfaces 93b on both sides in the width direction D are exposed within the hole 64e. Within the hole 64e, the third portion 93 is located above the bottom surface, which is located on the lower side of the inner surface of the hole 64e.

[0080] In Figure 9, the outer edge of the retaining member 80 is shown by a dashed line. As shown in Figure 9, the upper surface of the radial outer edge of the retaining member 80 is covered from above by a part of the first housing 60 over its entire circumference. As shown in Figure 13, the upper surface of the radial outer edge of the retaining member 80 is in contact with a retaining portion 65a, which is part of the wall portion constituting the substrate housing portion 65. In other words, the first housing 60 has a retaining portion 65a that contacts the upper surface of the radial outer edge of the retaining member 80. The retaining portion 65a is annular in shape surrounding the central axis J. In this embodiment, the retaining portion 65a is cylindrical, with the central axis J as its center and opening upward. The provision of the retaining portion 65a prevents the retaining member 80 embedded in the first housing 60 from shifting upward. As shown in Figure 16, the retaining portion 65a is located radially outward from the third through hole 87.

[0081] In this embodiment, the retaining member 80 is also pressed from above by a protruding support portion 68 provided on the first housing 60. The protruding support portion 68 protrudes upward from a portion of the axial wall portion 64a located radially inward from the pressing portion 65a, and protrudes above the retaining member 80 through the third through hole 87. In other words, the first housing 60 has a protruding support portion 68 that protrudes above the retaining member 80 through the third through hole 87. The protruding support portion 68 is exposed inside the substrate housing portion 65 and supports the substrate 95. This allows the substrate 95 to be stably held within the substrate housing portion 65. Furthermore, since the substrate 95 can be supported by the protruding support portion 68, which is part of the first housing 60, even if the retaining member 80 deforms, it is possible to suppress a shift in the relative position of the substrate 95 with respect to the first housing 60. This is possible to suppress a shift in the relative position between the conductive member 90, which is partially embedded in the first housing 60, and the substrate 95. Therefore, the substrate 95 and the conductive member 90 can be conveniently connected.

[0082] The protruding support portion 68 is substantially cylindrical in shape and extends in the axial direction. The protruding support portion 68 is passed through a hole 95b that penetrates the substrate 95 in the axial direction. The protruding support portion 68 has a small diameter portion 68a, a large diameter portion 68b, and a projection portion 68c. The small diameter portion 68a is the portion that connects to the axial wall portion 64a. The small diameter portion 68a is located inside the third through hole 87. The small diameter portion 68a is filled inside the third through hole 87. The large diameter portion 68b is connected to the upper side of the small diameter portion 68a. The outer diameter of the large diameter portion 68b is larger than the outer diameter of the small diameter portion 68a. The large diameter portion 68b is located above the upper surface of the base portion 81. The large diameter portion 68b is in contact with the upper surface of the retaining member 80. This further suppresses the retaining member 80 from shifting upward relative to the first housing 60. Furthermore, since the large-diameter portion 68b presses down on the retaining member 80 from above, deformation such as bending upward can be suppressed in the portion of the retaining member 80 that is located radially inward from the portion pressed down from above by the pressing portion 65a. In this embodiment, the outer peripheral edge of the lower end of the large-diameter portion 68b is in contact with the entire circumference of the peripheral edge of the third through hole 87 on the upper surface of the base portion 81.

[0083] The outer peripheral edge of the upper end of the large-diameter portion 68b is in contact with the peripheral edge of the hole portion 95b on the lower surface of the substrate 95. Thus, the protruding support portion 68 supports the substrate 95 from below. The projection portion 68c is connected to the upper side of the large-diameter portion 68b. The upper end of the projection portion 68c is the upper end of the protruding support portion 68. The outer diameter of the projection portion 68c is smaller than the outer diameter of the large-diameter portion 68b and the inner diameter of the hole portion 95b. The projection portion 68c passes through the hole portion 95b in the axial direction. This prevents the substrate 95 from moving in a direction perpendicular to the axial direction. A protruding support portion 68 is provided for each third through-hole 87. As shown in Figure 9, in this embodiment, three protruding support portions 68 are provided, spaced apart in the circumferential direction.

[0084] The manufacturing method of the pump 100 of this embodiment described above includes the step of assembling the stator 20, the holding member 80, and the conductive member 90 to create the assembly 110 shown in Figure 5. As shown in Figure 6, the worker brings the multiple conductive members 90 close to the stator 20 from above and attaches each conductive member 90 to each support part 27. The worker electrically connects the first conductive member 90a to the lead wire 23a by inserting the connection part 92b of the first conductive member 90a into the first support part 27a from above. The worker electrically connects the second conductive member 90b to the stator core 21 by inserting the connection part 94e of the second conductive member 90b into the second support part 27b from above. When inserting the connecting portions 92b and 94e of each conductive member 90 into the support portions 27, the worker or other person can pass a jig through the second through-hole 92d provided in the conductive member 90 and use the jig to push downwards the lower part of the inner edge of the second through-hole 92d, thereby allowing the connecting portions 92b and 94e of each conductive member 90 to be suitably pushed into the support portions 27. This makes it easier to attach each conductive member 90 to the support portions 27.

[0085] After attaching each conductive member 90 to the stator 20, the worker brings the holding member 80 closer to the stator 20 from above, as shown in Figure 7. The worker brings the holding member 80 closer to the stator 20 while passing the first portions 91 and 94a of each conductive member 90 through the fourth through holes 84. When the holding member 80 is brought close to the stator 20, the claw portion 85d of the snap-fit ​​portion 85 comes into contact with the upper end of the second portions 92 and 94b, and the snap-fit ​​portion 85 receives a force directed radially outward. As a result, the extension portion 85c elastically deforms radially outward. When the holding member 80 is brought even closer to the stator 20 in this state, the extension portion 85c returns to its original shape radially inward at a position where the claw portion 85d faces the second through hole 92d, and the claw portion 85d is inserted into the second through hole 92d. As a result, each conductive member 90 is held in place by the retaining member 80 through a snap-fit ​​structure. Therefore, by assembling the retaining member 80 and each conductive member 90 so that they are close to each other in the axial direction, each conductive member 90 can be easily and stably held in place by the retaining member 80.

[0086] The worker moves the retaining member 80 axially closer to the stator 20 until the lower end of the snap-fit ​​portion 85, i.e., the lower end of the extension portion 85c, contacts the upper end of the support portion 27. As shown in Figure 13, when the lower end of the extension portion 85c contacts the upper end of the support portion 27, the claw portion 85d is separated downward from the upper part of the inner edge of the second through hole 92d. Therefore, by moving the retaining member 80 closer to the stator 20 until the extension portion 85c abuts against the support portion 27, the worker can suitably insert the claw portion 85d of each snap-fit ​​portion 85 into the second through hole 92d of each conductive member 90. This makes it easier and more suitable to hold each conductive member 90 with respect to the retaining member 80. Thus, the assembly 110 having the stator 20, the retaining member 80, and the conductive member 90 is assembled.

[0087] The manufacturing method of the pump 100 in this embodiment includes a step of manufacturing the first housing 60 by insert molding. As shown in Figure 17, two molds M1 and M2 are used when manufacturing the first housing 60 by insert molding. By connecting the two molds M1 and M2 in the axial direction, a cavity C for molding the first housing 60 is created inside the molds M1 and M2.

[0088] The mold M2 is located vertically below the mold M1. The mold M2 includes a mold base M2a, a shaft support portion M2b projecting upward from the radial center of the mold base M2a, a side wall portion M2c projecting upward from the radial outer edge of the mold base M2a, and a support pin portion P projecting upward from the mold base M2a. The shaft support portion M2b is provided with a support hole portion M2d that is recessed downward from the upper surface of the shaft support portion M2b. The fixed shaft 30 is fitted into and held in the support hole portion M2d. This allows the mold M2 to support the fixed shaft 30 when insert molding the first housing 60.

[0089] The support pin portion P protrudes upward from the portion of the mold base M2a located radially between the shaft support portion M2b and the side wall portion M2c. Multiple support pin portions P are provided at intervals in the circumferential direction. In this embodiment, four support pin portions P are provided. Each support pin portion P is a portion that supports each protruding portion 26 from below. By supporting the multiple protruding portions 26 from below with multiple support pin portions P, the stator core 21 can be supported by the mold M2. This allows the stator 20 to be supported by the mold M2 when insert molding the first housing 60.

[0090] As shown in Figures 4 and 18, the support pin portion P is, for example, a plate-shaped plate extending axially with its surface facing radially. The support pin portion P has a first pin portion P1 and a second pin portion P2. The circumferential dimension of the first pin portion P1 is larger than the circumferential dimension of the second pin portion P2. The second pin portion P2 protrudes upward from the circumferential center of the upper end of the first pin portion P1.

[0091] The upper end of the first pin portion P1 contacts the lower surface of the protrusion 26. This allows the support pin portion P to support the protrusion 26 from below. The portion of the lower surface of the protrusion 26 that is in contact with the upper end of the first pin portion P1 becomes the first exposed surface 21a. The second pin portion P2 is fitted into the core recess 26a. The axial dimension of the second pin portion P2 is smaller than the axial dimension of the core recess 26a. The radially inner surface of the second pin portion P2 contacts the radially inner portion of the inner surface of the core recess 26a. This allows the support pin portion P to support the protrusion 26 from the radially outer side. The portion of the inner surface of the core recess 26a that is in contact with the radially inner surface of the second pin portion P2 becomes the second exposed surface 21b. The circumferential surfaces of the second pin portion P2 contact the circumferential portions of the inner surface of the core recess 26a, respectively. This allows the support pin portion P to support the protrusion 26 in the circumferential direction. The portion of the inner surface of the core recess 26a that comes into contact with the circumferential surfaces on both sides of the second pin portion P2 becomes the third exposed surface 21c.

[0092] The support pin portion P allows the protrusion 26 to be supported in the axial, radial, and circumferential directions, enabling the stator 20 to be positioned and supported relative to the mold M2 in the axial, radial, and circumferential directions. This effectively suppresses misalignment of the stator 20 when molding the first housing 60.

[0093] As shown in Figure 17, the mold M1 has a mold portion M1a that forms the interior of the substrate housing portion 65. The mold portion M1a protrudes downward. The mold portion M1a has an upper mold portion M1b and a lower mold portion M1c. The upper mold portion M1b is the portion that forms the part of the interior of the substrate housing portion 65 that is located above the exposed surface 81c. The upper mold portion M1b is substantially cylindrical with a central axis J as its center. The lower surface of the radially outer portion of the upper mold portion M1b contacts the upper surface of the base portion 81 of the holding member 80. The portion of the upward-facing surface of the base portion 81 that contacts the lower surface of the upper mold portion M1b becomes the exposed surface 81c.

[0094] The upper mold portion M1b is provided with a first mold recess M1d that is recessed upward from the lower surface of the upper mold portion M1b. Although not shown in the figure, there are four first mold recesses M1d that are spaced apart in the circumferential direction. Each first protrusion 83 is fitted into the lower end of each first mold recess M1d. Each first protrusion 83 is fitted into each first mold recess M1d without any gaps, or with almost no gaps. The portion of each conductive member 90 that protrudes above the first protrusion 83 is housed inside each first mold recess M1d. The portion of each conductive member 90 that is housed inside the first mold recess M1d becomes the exposed portion 97. In the axial and radial directions, the dimensions of the first mold recess M1d are sufficiently larger than the portion of each conductive member 90 that is housed inside the first mold recess M1d. Therefore, a sufficient gap is provided between the portion of the conductive member 90 housed in the first mold recess M1d and the inner surface of the first mold recess M1d.

[0095] The upper mold portion M1b is provided with a second mold recess M1e that is recessed upward from the lower surface of the upper mold portion M1b. The second mold recess M1e is the part that forms the large diameter portion 68b and the projection portion 68c of the protruding support portion 68. The peripheral edge of the second mold recess M1e on the lower surface of the upper mold portion M1b contacts the peripheral edge of the third through hole 87 on the upper surface of the base portion 81 all the way around. The protruding support portion 68 is molded by filling the inside of the third through hole 87 and the inside of the second mold recess M1e with resin.

[0096] The lower mold portion M1c protrudes downward from the radially inward portion of the upper mold portion M1b. The lower mold portion M1c is the interior of the first recess 69 and the part that forms the shaft holding portion 64c. The lower mold portion M1c is cylindrical with a central axis J at its center and opening downward. The upper end of the fixed shaft 30 is inserted into the interior of the lower mold portion M1c. By filling the interior of the lower mold portion M1c with resin, the shaft holding portion 64c that embeds and holds the upper end of the fixed shaft 30 is molded.

[0097] As shown in Figure 15, the mold M1 has a protruding mold portion M1f that protrudes downward from the upper mold portion M1b. The protruding mold portion M1f is the part that forms the interior of the hole portion 64e. The protruding mold portion M1f is passed through the first through hole 86 from above. The protruding mold portion M1f has a main body portion M1g and a pair of projections M1h that protrude downward from both ends of the main body portion M1g in the width direction D. The lower surface of the main body portion M1g is positioned opposite the upper surface 93a of the third portion 93 with a small gap between them. This allows the protruding mold portion M1f to press down on the third portion 93 from above. The pair of projections M1h are positioned on either side of the third portion 93 in the width direction D. The pair of projections M1h are positioned opposite the pair of side surfaces 93b of the third portion 93 with a small gap between them. This allows the protruding mold portion M1f to press down on the third portion 93 from both sides in the width direction D. The portion of the third part 93 that is held down by the protruding mold portion M1f becomes the portion exposed within the hole portion 64e. Because the third part 93 can be held down by the protruding mold portion M1f, when the first housing 60 is molded, even if each conductive member 90 is subjected to pressure due to the filling of resin, it is possible to suppress the displacement of each conductive member 90 relative to the first housing 60. Furthermore, because the displacement of each conductive member 90 is suppressed, the relative position of each conductive member 90, which is partially embedded in the first housing 60, and the substrate 95 can be further suppressed. As a result, the terminal portions 91b and 94d of the conductive member 90 can be connected to the substrate 95 with high precision.

[0098] With the fixed shaft 30 and assembly 110 supported in mold M2, mold M1 and mold M2 are connected axially to create a cavity C, and the first housing 60 can be molded by pouring resin into the cavity C. The area where the support pin portion P was provided becomes the third recess 66a in the first housing 60. Also, as described above, the portion of the support pin portion P that was in contact with the protruding portion 26 becomes the exposed surface that is exposed inside the third recess 66a.

[0099] After forming the first housing 60, the worker assembles the rotor 10 and the pump unit 40 to the first housing 60 and fixes the first housing 60 and the second housing 70 to each other by welding. In this embodiment, before bringing the first housing 60 and the second housing 70 into contact, the first welded fixing portion 67 in the first housing 60 and the second welded fixing portion 77 in the second housing 70 are melted by heat. By bringing the molten first welded fixing portion 67 and the second welded fixing portion 77 into contact with each other in the axial direction, the first housing 60 and the second housing 70 can be fixed to each other by welding.

[0100] In this specification, "workers, etc." includes workers and assembly equipment, etc., who perform each task. Each task may be performed by workers alone, by assembly equipment alone, or by workers and assembly equipment together.

[0101] According to this embodiment, the conductive member 90 has an exposed portion 97 that protrudes upward from the holding member 80 and is exposed inside the substrate housing portion 65. The portion of the upward-facing surface of the holding member 80 that surrounds the exposed portion 97 is exposed inside the substrate housing portion 65. Therefore, as described above, when insert molding the first housing 60, the mold M1 can be brought into contact with the peripheral edge of the upward-facing surface of the holding member 80 that surrounds the portion of the conductive member 90 that will become the exposed portion 97. This allows the holding member 80 to close the lower opening of the first mold recess M1d in which the portion of the conductive member 90 that will become the exposed portion 97 is housed, thereby suppressing the entry of resin into the first mold recess M1d when insert molding the first housing 60. Therefore, even if the dimensions of the first mold recess M1d are larger than the exposed portion 97, it is possible to suppress the exposure portion 97 from being covered with resin. Therefore, by making the first mold recess M1d sufficiently large in the axial and radial directions, the exposed portion 97 can be easily inserted into the first mold recess M1d. This allows the mold M2 holding the assembly 110 to be moved vertically upward towards the mold M1, and the exposed portion 97 to be inserted into the first mold recess M1d. Therefore, the man-hours and time required to manufacture the first housing 60 by insert molding can be reduced. This makes it easier to manufacture the first housing 60 and improves the productivity of the pump 100.

[0102] Furthermore, according to this embodiment, the retaining member 80 has a base portion 81 and a first protrusion 83 that protrudes upward from the base portion 81. The exposed portion 97 protrudes upward from the first protrusion 83. The first protrusion 83 is exposed inside the substrate housing portion 65. Therefore, when insert molding the first housing 60, the first protrusion 83 can be fitted into the lower end of the first mold recess M1d. This allows the lower end of the first mold recess M1d to be sealed more effectively, and further suppresses the entry of resin into the first mold recess M1d when insert molding the first housing 60. Also, even if resin does enter the first mold recess M1d, the first protrusion 83 can easily block the entered resin. Therefore, it is possible to further suppress the exposure portion 97 from being covered with resin.

[0103] Furthermore, according to this embodiment, the portion of the base 81 facing upward that surrounds the first protrusion 83 is exposed inside the substrate housing 65. Therefore, when insert molding the first housing 60, the mold M1 can be brought into contact with the portion of the base 81 facing upward that surrounds the first protrusion 83. This makes it possible to more effectively suppress the ingress of resin into the first mold recess M1d when insert molding the first housing 60. Consequently, it is possible to more effectively suppress the covering of the exposed portion 97 with resin.

[0104] Furthermore, according to this embodiment, the base portion 81 is annular in shape, surrounding the central axis J. The upward-facing surface of the base portion 81 has an exposed surface 81c that surrounds the central axis J and is exposed inside the substrate housing portion 65. The exposed surface 81c includes portions that surround each of the multiple first protrusions 83. Therefore, when insert molding the first housing 60, the mold M1 can be brought into contact with the upward-facing surface of the base portion 81 over a full circumference. In this embodiment, the lower surface of the radially outer portion of the upper mold portion M1b can be brought into contact with the upward-facing surface of the base portion 81 over a full circumference. This allows the exposed portions 97 of the multiple conductive members 90 to be suitably exposed inside the substrate housing portion 65 while suppressing the complexity of the mold M1.

[0105] Furthermore, according to this embodiment, the first through-hole 86 is exposed inside the substrate housing portion 65. The first housing 60 has a hole portion 64e connected to the lower side of the first through-hole 86. At least a portion of the upper surface 93a, which is the upward-facing surface of the third portion 93, and at least a portion of the side surface 93b, which is the width-facing surface D of the third portion 93, are exposed inside the hole portion 64e. Therefore, when insert molding the first housing 60, the protruding mold portion M1f of the mold M1 can press down on at least a portion of the upper surface 93a and at least a portion of the side surface 93b. As a result, when insert molding the first housing 60, the mold M1 can press down on the third portion 93 in the axial direction and width-facing direction D, thereby suppressing movement of the conductive member 90 within the cavity C. Therefore, the relative positional accuracy of the conductive member 90 with respect to the first housing 60 can be improved. Furthermore, the conductive member 90 can be held in place by the protruding mold portion M1f using the first through-hole 86, which is provided for forming the claw portion 85d. Therefore, when insert molding the first housing 60, it is not necessary to separately provide a structure in the retaining member 80 for holding the conductive member 90 with the mold M1. This helps to suppress an increase in the manufacturing cost of the retaining member 80.

[0106] Furthermore, according to this embodiment, the retaining member 80 and the conductive member 90 are molded separately before being assembled together. Therefore, compared to the case where the retaining member 80 is insert-molded with the conductive member 90 as an insert member, it is easier to fine-tune the relative position of the conductive member 90 with respect to the retaining member 80. As a result, even if dimensional deviations occur due to tolerances, it is easier to assemble multiple conductive members 90 to the stator 20 and to hold multiple conductive members 90 in the retaining member 80. In addition, in this embodiment, since the conductive member 90 is held in place of the retaining member 80 by a snap-fit ​​structure, even if the retaining member 80 and the conductive member 90 are molded separately before being assembled, it is possible to suppress an increase in the man-hours and time required for the work of holding the conductive member 90 in place of the retaining member 80. Furthermore, by providing the retaining member 80 with a snap-fit ​​portion 85 having an extended portion 85c and a claw portion 85d, the conductive member 90 can be easily held in place of the retaining member 80 by a snap-fit ​​structure.

[0107] When forming the retaining member 80 using a mold, a first through-hole 86 is required to remove the mold in order to provide the claw portion 85d. Here, for example, if the conductive member 90 is a member that extends straight in the axial direction, the first through-hole 86 needs to be provided in a position close to the exposed portion 97, and it may be difficult to expose the peripheral portion of the upper surface of the retaining member 80 that surrounds the exposed portion 97. In contrast, in this embodiment, by arranging the first portion 91 of the conductive member 90 having the exposed portion 97 and the second portion 92 provided with the second through-hole 92d into which the claw portion 85d catches, with a radial offset, the first through-hole 86 can be positioned away from the exposed portion 97. As a result, the conductive member 90 can be held in the retaining member 80 by a simple snap-fit ​​structure that provides the extended portion 85c and the claw portion 85d, while the exposed portion 97 can be suitably exposed within the substrate housing portion 65. Furthermore, by shifting the first portion 91 and the second portion 92 radially, the third portion 93 connecting the first portion 91 and the second portion 92 can be positioned to overlap the first through-hole 86 in the axial direction. This allows a part of the mold M1, i.e., the protruding mold portion M1f, to be inserted into the first through-hole 86 from above and hold down the third portion 93. Also, by assembling the conductive member 90 to the stator 20 before it is held by the holding member 80, as described above, the conductive member 90 can be pushed axially using the second through-hole 92d, which the claw portion 85d is hooked onto. Since the second through-hole 92d is provided in the second portion 92 where the connecting portion 92b is provided, pushing the conductive member 90 downwards through the second through-hole 92d makes it easier to push the connecting portion 92b from directly above to directly below. This prevents the conductive member 90 from tilting radially with respect to the axial direction when it is assembled to the stator 20.

[0108] As described above, in this embodiment, the retaining member 80 and the conductive member 90 are molded separately and then combined, allowing for fine adjustments in case of dimensional deviations, while also enabling easy assembly of the retaining member 80 and the conductive member 90 using a snap-fit ​​structure. Furthermore, by utilizing the first through-hole 86 and the second through-hole 92d, which are necessary to provide a simple snap-fit ​​structure using the extension portion 85c and the claw portion 85d, it is possible to suppress the shifting of the conductive member 90 during insert molding of the first housing 60, and to suppress the tilting of the conductive member 90 when assembling the conductive member 90 to the stator 20. As a result, according to this embodiment, the pump 100 can be assembled with high precision, and the productivity of the pump 100 can be suitably improved.

[0109] Furthermore, according to this embodiment, the upper end of the fixed shaft 30 is embedded in and held in the axial wall portion 64a. The first housing 60 has a third recess 66a that is recessed upward from the lower surface of the first housing 60. The stator core 21 has a first exposed surface 21a that faces downward and is exposed inside the third recess 66a. Therefore, as described above, when insert molding the first housing 60, the stator core 21 can be supported by the support pin portion P from the same side as the side on which the fixed shaft 30 is supported by the mold M2, i.e., from below. This makes it possible to support the fixed shaft 30 and the assembly 110 in the same mold M2. Therefore, compared to, for example, the case where the fixed shaft 30 and the assembly 110 are supported in different molds, it is easier to install the fixed shaft 30 and the assembly 110 in the mold M2. As a result, the man-hours and time required for manufacturing the first housing 60 by insert molding can be further reduced. This makes the first housing 60 easier to manufacture and improves the productivity of the pump 100. Furthermore, compared to the case where the assembly 110 is held in the mold M1 located on the upper side, the assembly 110 can be easily installed in the mold M2 by supporting the stator core 21 from below with the support pin portion P, thus suppressing the complexity of the shapes of the molds M1 and M2. In addition, since the first housing 60 can be molded with the fixed shaft 30 and the assembly 110 supported in the same mold M2, the relative positional accuracy between the fixed shaft 30 and the assembly 110 can be improved compared to the case where the fixed shaft 30 and the assembly 110 are supported in separate molds.

[0110] For example, even if the assembly 110 shown in Figure 17 is inverted vertically (axially) and the assembly 110 is supported from the vertically lower side by a mold located vertically below, the productivity of the pump 100 can be improved in the same way as described above by providing a recess similar to the first mold recess M1d described above in the mold located vertically below. However, in this case, if the fixed shaft 30 needs to be an insert member as in this embodiment, the fixed shaft 30 needs to be supported by a mold located vertically above, so a structure needs to be provided in the mold located vertically above to support the fixed shaft 30, which tends to complicate the mold. Therefore, it may be difficult to improve the productivity of the pump 100. In contrast, in this embodiment, by supporting the assembly 110 by the mold M2 located vertically below with the holding member 80 positioned vertically above the stator 20, both the assembly 110 and the fixed shaft 30 can be supported from vertically below by the same mold M2 and easily installed in the mold M2. Therefore, while suppressing the complexity of the mold M2, the first housing 60 can be insert-molded using the assembly 110 and the fixed shaft 30 as insert members. As a result, the productivity of the pump 100 can be suitably improved.

[0111] Furthermore, according to this embodiment, the stator core 21 has a second exposed surface 21b that faces radially outward and is exposed inside the third recess 66a. Therefore, as described above, the first housing 60 can be insert molded with the stator core 21 supported from the radially outward side. This improves the radial positional accuracy of the stator 20 relative to the first housing 60.

[0112] Furthermore, according to this embodiment, the stator core 21 has a third exposed surface 21c that faces circumferentially and is exposed inside the third recess 66a. Therefore, as described above, the first housing 60 can be insert molded with the stator core 21 positioned circumferentially. This improves the circumferential positional accuracy of the stator 20 relative to the first housing 60.

[0113] Furthermore, according to this embodiment, the stator core 21 has a projection 26 that protrudes radially outward from the core back 24. The first exposed surface 21a and the second exposed surface 21b are provided on the projection 26. Therefore, the portion of the stator 20 that is supported by the support pin portion P when insert molding the first housing 60 can be positioned radially outward from the core back 24. This allows the position of the third recess 66a, which is created by the provision of the support pin portion P, to be positioned radially outward from the core back 24. Consequently, the third recess 66a is more easily positioned radially outward from the flow channel portion 76 provided in the second housing 70. Therefore, it is possible to suppress the lower opening of the third recess 66a from opening toward the flow channel portion 76. This prevents water flowing through the flow channel portion 76 from flowing into the third recess 66a. Furthermore, when the stator 20 is embedded and held in the resin first housing 60, there is no need to fix the core back 24 to the housing 50 by shrink fitting or press fitting, making it easier to reduce the radial thickness of the core back 24. When the radial thickness of the core back 24 is reduced, if a groove or the like is provided on the core back 24 to support the core back 24 on the support pin portion P, the flow of magnetic flux in the core back 24 tends to be obstructed. In contrast, in this embodiment, a protrusion 26 is provided that protrudes radially outward from the core back 24, and the protrusion 26 is supported on the support pin portion P, so there is no need to provide a groove or the like on the core back 24 to support the support pin portion P. This makes it possible to suppress obstruction of the flow of magnetic flux in the core back 24.

[0114] Furthermore, the protruding portion 26 has a core recess 26a that is recessed radially inward from the radially outer surface of the protruding portion 26. The first exposed surface 21a is provided on the lower end face of the protruding portion 26. The second exposed surface 21b is provided on the radially inward portion of the inner surface of the core recess 26a. Therefore, as described above, the stator 20 can be supported by the mold M2 by fitting the second pin portion P2 of the support pin portion P into the core recess 26a and supporting the protruding portion 26 from below with the first pin portion P1. This allows the first housing 60 to be molded while positioning the stator 20 in the axial and radial directions by the mold M2. In addition, the position of the second pin portion P2 within the core recess 26a also suppresses circumferential movement of the stator 20 supported by the mold M2.

[0115] Furthermore, according to this embodiment, multiple protrusions 26 are provided at intervals in the circumferential direction. Therefore, the stator core 21 can be stably supported by the mold M2 by multiple support pins P. This effectively suppresses movement of the stator core 21 due to the resin poured into the cavity C when insert molding the first housing 60.

[0116] Furthermore, according to this embodiment, the second housing 70 has a flow channel 76 located radially outward from the pump section 40. The third recess 66a is located radially outward from the flow channel 76. Therefore, the lower opening of the third recess 66a does not open into the flow channel 76, and the inflow of water flowing in the flow channel 76 into the third recess 66a can be more effectively suppressed.

[0117] Furthermore, according to this embodiment, the second housing 70 closes the lower opening of the third recess 66a. Therefore, it is possible to effectively prevent water from entering the interior of the third recess 66a. In addition, since the lower opening of the third recess 66a can be closed by fixing the second housing 70 to the first housing 60, there is no need to provide a separate member to close the lower opening of the third recess 66a. As a result, the number of parts of the pump 100 can be reduced, and the productivity of the pump 100 can be further improved.

[0118] Furthermore, according to this embodiment, the second housing 70 is made of resin and has a second welded fixing portion 77 that is fixed to the first housing 60 by welding. The second welded fixing portion 77 closes the lower opening of the third recess 66a. Therefore, the lower opening of the third recess 66a can be more effectively closed by the second housing 70. This makes it possible to more effectively suppress water from entering the third recess 66a.

[0119] Furthermore, according to this embodiment, the first housing 60 has a large-diameter housing portion 61 in which at least a part of the stator core 21 is embedded and held, and a small-diameter housing portion 62 connected to the upper side of the large-diameter housing portion 61 and having a smaller outer diameter than the large-diameter housing portion 61. Between the axial direction of the large-diameter housing portion 61 and the small-diameter housing portion 62 on the radially outer surface of the first housing 60, there is a stepped portion 63 having an upward-facing stepped surface 63a. The third recess 66a is provided on the lower surface of the large-diameter housing portion 61. Therefore, when welding the second welding fixing portion 77 to the first housing 60, the first housing 60 can be held by bringing a jig into contact with the stepped surface 63a of the stepped portion 63, thereby enabling stable welding of the first housing 60 and the second housing 70. This allows the first welded fixing portion 67 and the second welded fixing portion 77 to be suitably welded together, and the second welded fixing portion 77 can more suitably close the lower opening of the third recess 66a.

[0120] As described above, in this embodiment, by providing a protrusion 26 on the stator core 21, when forming the first housing 60, the portion of the stator 20 supported by the mold M2 is positioned radially outward from the flow channel 76, and the third recess 66a is positioned so as not to overlap with the flow channel 76 in the axial direction, while the lower opening of the third recess 66a can be closed by welding the second housing 70 to the first housing 60. Therefore, even if the third recess 66a is opened on the side of the stator 20 where the flow channel 76 is located, i.e., on the lower side, it is possible to suppress water from entering the third recess 66a, and there is no need to provide a separate process to close the third recess 66a. As a result, it is possible to suitably suppress water from entering the third recess 66a while suitably improving the productivity of the pump 100.

[0121] The present invention is not limited to the embodiments described above, and other configurations and methods may be adopted within the scope of the technical idea of ​​the present invention. The conductive member may be any member as long as it is conductive and is held by the retaining member. The conductive member may be a member that is not connected to the substrate in the substrate housing. The number of conductive members is not particularly limited as long as there is one or more. The conductive member may have any shape as long as it has an exposed portion. If the conductive member and the retaining member are molded and assembled separately, the conductive member may be held by the retaining member by a method other than a snap-fit ​​structure. If the retaining member is provided with a claw portion, the first direction in which the claw portion protrudes may be any direction as long as it is perpendicular to the axial direction. The claw portion may be hooked onto the conductive member in any way.

[0122] The retaining member may have any configuration as long as it is located on the other axial side (upper side) of the stator, holds the conductive member, and the portion of the surface of the retaining member facing the other axial side (upper side) that surrounds the exposed portion is exposed inside the substrate housing. The retaining member may be made by insert molding with the conductive member as the insert member. In this case, the retaining member can be molded and the conductive member can be held in the retaining member. In this case, for example, the assembly that will become the insert member when insert molding the resin housing (first housing) is assembled by bringing the retaining member holding the conductive member closer to the stator from the other axial side (upper side) and supporting the retaining member on the stator from one axial side (lower side).

[0123] If the surface of the first protrusion on the retaining member facing the other axial side (upward side) is exposed to the inside of the substrate housing, then the portion of the surface of the base of the retaining member facing the other axial side (upward side) that surrounds the first protrusion does not need to be exposed to the inside of the substrate housing. The first protrusion does not need to be provided. If the retaining member is provided with a second protrusion, the second recess does not need to be provided. The second protrusion does not need to be provided.

[0124] The circuit board housed within the circuit board housing can be a circuit board used for any purpose. The circuit board does not need to have an inverter circuit that supplies power to the stator coils. The circuit board may also be a circuit board to which a rotation sensor capable of detecting the rotation of the rotor is connected. A fixed shaft may not be provided, and the rotor may have a shaft that rotates around a central axis.

[0125] The applications of the pump to which the present invention applies are not particularly limited. The pump may be mounted on any equipment. For example, the pump may be mounted on a vehicle. The pump may be a pump that delivers any fluid. The pump may be an oil pump that delivers oil.

[0126] Furthermore, this technology can be configured as follows: (1) A pump comprising: a rotor rotatable about a central axis; a stator radially opposite to the rotor with a gap between them; a pump section connected to one axial side of the rotor; a retaining member located on the other axial side of the stator; a conductive member held by the retaining member; a resin housing having a rotor housing section that houses the rotor inside; and a substrate housed inside the resin housing, wherein the resin housing has a substrate housing section located on the other axial side of the rotor housing section that houses the substrate inside; at least a portion of the stator and at least a portion of the retaining member are embedded in and held by the resin housing; the conductive member has an exposed portion that protrudes from the retaining member on the other axial side and is exposed inside the substrate housing section; and the portion of the surface of the retaining member facing the other axial side that surrounds the exposed portion is exposed inside the substrate housing section. (2) The pump according to (1), wherein the retaining member has a base and a first protrusion projecting from the base in the other axial direction, the exposed portion protruding from the first protrusion in the other axial direction, and the first protrusion is exposed inside the substrate housing portion. (3) The pump as described in (2), wherein the portion of the base facing the other axial direction that surrounds the first protrusion is exposed inside the substrate housing. (4) The pump according to (3), wherein the conductive members and the first protrusions are provided in a plurality at intervals in the circumferential direction, the exposed portions of the plurality of conductive members protrude in the other axial direction from each of the plurality of first protrusions, the base is annular in shape surrounding the central axis, and the surface of the base facing the other axial direction has an exposed surface that surrounds the central axis and is exposed inside the substrate housing, and the exposed surface includes portions that surround each of the plurality of first protrusions. (5) The pump according to (4), comprising an electronic component mounted on the substrate, wherein the resin housing has a first recess recessed on one side in the axial direction, the first recess is located radially inward from the base, and at least a portion of the electronic component is housed inside the first recess. (6) The pump according to any one of (1) to (5), wherein the conductive member is held in place by the retaining member by a snap-fit ​​structure. (7) The pump according to (6), wherein the retaining member has a first through hole that penetrates the retaining member in the axial direction, an extended portion that extends from the edge of the first through hole to one side in the axial direction, and a claw portion that protrudes from the extended portion in a first direction perpendicular to the axial direction and overlaps with the first through hole when viewed in the axial direction, and the claw portion is hooked onto the conductive member. (8) The pump according to (7), wherein the stator has a coil, and the conductive member includes a first conductive member electrically connected to the coil, the first conductive member having a first portion having the exposed portion and a second portion connected to the coil, the position of the second portion in the first direction being different from the position of the first portion in the first direction, the second portion having a second through hole penetrating the second portion in the first direction, and the claw portion being hooked onto the inner edge of the second through hole. (9) The pump according to (8), wherein the first conductive member has a third portion that protrudes from the first portion in a first direction and connects to the second portion, the first through hole is exposed inside the substrate housing, the resin housing has a hole connected to one side of the first through hole in the axial direction, and at least a portion of the surface of the third portion facing the other side in the axial direction, and at least a portion of the surface of the third portion facing a second direction perpendicular to both the axial direction and the first direction is exposed inside the hole. (10) The pump according to any one of (1) to (9), wherein the retaining member has a third through hole that penetrates the retaining member in the axial direction, the resin housing has a protruding support portion that protrudes axially from the retaining member through the third through hole, the protruding support portion is exposed inside the substrate housing portion and supports the substrate. (11) The pump according to (10), wherein the protruding support portion has a small diameter portion located inside the third through hole and a large diameter portion connected to the other axial side of the small diameter portion, and the large diameter portion is in contact with the other axial side surface of the holding member. (12) The pump according to any one of (1) to (11), wherein the resin housing has a pressing portion that contacts the other axial surface on the radial outer edge of the retaining member. (13) The pump according to any one of (1) to (12), wherein the stator has a stator core, and the conductive member includes a second conductive member that contacts the stator core. (14) The pump according to any one of (1) to (13), wherein the retaining member has a second protrusion projecting in one direction in the axial direction, and the second protrusion is embedded in the resin housing. (15) The pump according to (14), wherein the retaining member has a second recess that is recessed on one side in the axial direction, and the second recess is provided in a position that overlaps with the second protrusion when viewed in the axial direction.

[0127] The configurations and methods described herein can be combined as appropriate, within the bounds of non-inconsistency. [Explanation of symbols]

[0128] 10...Rotor, 20...Stator, 21...Stator core, 23...Coil, 40...Pump section, 50...Housing, 60...First housing (resin housing), 64...Rotor housing section, 64e...Hole section, 65...Substrate housing section, 65a...Pressing section, 68...Protruding support section, 68a...Small diameter section, 68b...Large diameter section, 69...First recess, 80...Holding member, 81...Base section, 81c...Exposed surface, 83, 83a, 83b...First protrusion section, 85c...Extended section 85d...Claw portion, 86, 86a, 86b...First through hole, 87...Third through hole, 88...Second convex portion, 88a...Second concave portion, 90...Conductive member, 90a...First conductive member, 90b...Second conductive member, 91, 94a...First portion, 92, 94b...Second portion, 92d...Second through hole, 93, 94c...Third portion, 95...Substrate, 96...Electronic component, 97, 97a, 97b...Exposed portion, 100...Pump, D...Width direction (second direction), J...Central axis

Claims

1. A rotor that can rotate about its central axis, A stator facing the rotor radially with a gap in between, A pump section connected to one axial side of the rotor, A retaining member located on the other axial side of the stator, The conductive member held by the holding member, A resin housing having a rotor housing portion that houses the rotor inside, A substrate housed inside the resin housing, Equipped with, The resin housing has a substrate housing portion located on the other axial side of the rotor housing portion and housing the substrate inside, At least a portion of the stator and at least a portion of the retaining member are embedded in and held in the resin housing. The conductive member has an exposed portion that protrudes from the holding member in the other axial direction and is exposed inside the substrate housing portion. The portion of the holding member facing the other axial direction that surrounds the exposed portion is exposed inside the substrate housing portion, which is a pump.

2. The aforementioned retaining member is The base and, A first protrusion projecting from the base toward the other axial direction, It has, The exposed portion protrudes from the first protrusion in the other axial direction, The pump according to claim 1, wherein the first protrusion is exposed inside the substrate housing portion.

3. The pump according to claim 2, wherein the portion of the base facing the other axial direction that surrounds the first protrusion is exposed inside the substrate housing.

4. The conductive member and the first protrusion are provided in multiple locations with spacing between them in the circumferential direction. The exposed portion of the plurality of conductive members protrudes axially to the other side from each of the plurality of first protrusions, The base is an annular shape surrounding the central axis, The surface of the base facing the other side in the axial direction has an exposed surface that surrounds the central axis and is exposed inside the substrate housing portion. The pump according to claim 3, wherein the exposed surface includes portions that surround each of the plurality of first protrusions.

5. The circuit board is equipped with electronic components mounted on it, The resin housing has a first recess that is recessed on one side in the axial direction, The first recess is located radially inward from the base, The pump according to claim 4, wherein at least a portion of the electronic components is housed inside the first recess.

6. The pump according to any one of claims 1 to 5, wherein the conductive member is held by the retaining member by a snap-fit ​​structure.

7. The aforementioned retaining member is The retaining member has a first through-hole that penetrates it in the axial direction, An extension portion extending from the edge of the first through hole in one axial direction, A claw portion protrudes from the extended portion in a first direction perpendicular to the axial direction and overlaps with the first through hole when viewed in the axial direction, It has, The pump according to claim 6, wherein the claw portion is hooked onto the conductive member.

8. The stator has a coil, The conductive member includes a first conductive member electrically connected to the coil, The first conductive member is The first portion having the exposed portion, The second part connected to the coil, It has, The position of the second part in the first direction is different from the position of the first part in the first direction. The second portion has a second through hole that penetrates the second portion in the first direction, The pump according to claim 7, wherein the claw portion is hooked onto the inner edge of the second through hole.

9. The first conductive member has a third portion that protrudes from the first portion in a first direction and connects to the second portion, The first through-hole is exposed inside the substrate housing portion, The resin housing has a hole that connects to one axial side of the first through hole, The pump according to claim 8, wherein at least a portion of the surface of the third portion facing the other axial direction, and at least a portion of the surface of the third portion facing a second direction perpendicular to both the axial direction and the first direction, are exposed inside the hole.

10. The retaining member has a third through-hole that penetrates the retaining member in the axial direction, The resin housing has a protruding support portion that protrudes axially in the other direction from the retaining member through the third through hole, The pump according to any one of claims 1 to 5, wherein the protruding support portion is exposed inside the substrate housing portion and supports the substrate.

11. The aforementioned protruding support portion is The small diameter portion located inside the third through hole, A larger diameter portion connected to the other axial side of the smaller diameter portion, It has, The pump according to claim 10, wherein the large-diameter portion is in contact with the other axial surface of the holding member.

12. The pump according to any one of claims 1 to 5, wherein the resin housing has a pressing portion that contacts the other axial surface on the radial outer edge of the retaining member.

13. The stator has a stator core, The pump according to any one of claims 1 to 5, wherein the conductive member includes a second conductive member that contacts the stator core.

14. The retaining member has a second protrusion that protrudes to one side in the axial direction, The pump according to any one of claims 1 to 5, wherein the second protrusion is embedded in the resin housing.

15. The retaining member has a second recess that is recessed on one side in the axial direction, The pump according to claim 14, wherein the second recess is provided at a position that overlaps with the second protrusion when viewed in the axial direction.

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