Pump

Abstract

A pump according to the present invention comprises a rotor that can rotate around a center axis, a stator that is opposite the rotor in the radial direction with a gap therebetween, a pump part that is connected to one side in the axial direction of the rotor, a holding member that is positioned on the other side in the axial direction of the stator, a conduction member that is held by the holding member, a resin housing that has a rotor housing part that houses the rotor, and a substrate that is housed in the resin housing. The resin housing has a substrate housing part that is positioned on the other side in the axial direction of the rotor housing part and houses the substrate. At least a portion of the stator and at least a portion of the holding member are embedded and held in the resin housing. The conduction member has an exposed part that protrudes from the holding member to the other side in the axial direction and is exposed to the inside of the substrate housing part. A surface of the holding member that faces the other side in the axial direction has a portion that surrounds the exposed part and is exposed to the inside of the substrate housing part.

Description

pump

[0001] The present invention relates to a pump.

[0002] 2. Description of the Related Art Conventionally, there has been known an electric pump having a structure in which a resin casing is insert-molded with a terminal member that is partially exposed in a driver chamber that houses a circuit board (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2019-183766

[0004] In the electric pump described above, the casing needs to be insert-molded with the portion of the terminal member exposed inside the driver chamber inserted into a hole in the mold. The size of the hole is designed to leave almost no gap between the inserted portion of the terminal member and the hole to prevent resin from flowing into the hole. This can make it difficult to insert the terminal member into the hole and therefore difficult to insert-molde the casing. This can result in reduced productivity of the pump.

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

[0006] One aspect of the pump of the present invention includes a rotor rotatable about a central axis, a stator radially opposed to the rotor via a gap, 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 accommodating section that accommodates the rotor, and a substrate accommodated inside the resin housing. The resin housing has a substrate accommodating section located on the other axial side of the rotor accommodating section and that accommodates the substrate. At least a portion of the stator and at least a portion of the retaining member are embedded and held in the resin housing. The conductive member has an exposed portion that protrudes from the retaining member to the other axial side and is exposed inside the substrate accommodating section. A portion of the surface of the retaining member facing the other axial side, surrounding the exposed portion, is exposed inside the substrate accommodating section.

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

[0008] FIG. 1 is a perspective view of a pump according to an embodiment. FIG. 2 is a cross-sectional view of the pump according to an embodiment, taken along line II-II in FIG. 3. FIG. 3 is a cross-sectional view of the pump according to an embodiment. FIG. 4 is a perspective view of a stator core according to an embodiment. FIG. 5 is a perspective view of a stator, a holding member, and a conductive member according to an embodiment. FIG. 6 is an exploded perspective view of the stator and the conductive member according to an embodiment. FIG. 7 is an exploded perspective view of a portion of the stator, the holding member, and a portion of the conductive member according to an embodiment. FIG. 8 is a perspective view of a first housing according to an embodiment. FIG. 9 is a top view of the interior of a substrate accommodating portion according to an embodiment. FIG. 10 is a bottom view of a third recess according to an embodiment. FIG. 11 is a perspective view of a portion of the holding member and the conductive member according to an embodiment. FIG. 12 is a perspective view of a portion of the holding member according to an embodiment. FIG. 13 is a cross-sectional view of a portion of the pump according to an embodiment. FIG. 14 is a perspective view of a portion of the pump according to an embodiment. FIG. 15 is a cross-sectional view of a portion of the pump according to an embodiment, showing a first through-hole and a hole. Fig. 16 is a cross-sectional view showing a portion of a pump according to an embodiment, illustrating a protruding support portion. Fig. 17 is a cross-sectional view showing a portion of a procedure for insert-molding a first housing according to an embodiment. Fig. 18 is a view showing a state in which a protruding portion of a stator core is supported by a support pin according to an embodiment.

[0009] Each figure shows an imaginary central axis J of a pump according to an embodiment described below. In the following description, the axial direction of the central axis J will be simply referred to as the "axial direction," the radial direction about the central axis J will be simply referred to as the "radial direction," and the circumferential direction about the central axis J will be 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 toward which the arrow of the Z axis points (+Z side) will be referred to as the "upper side," and the side of the axial direction opposite to the side toward which the arrow of the Z axis points (-Z side) will be referred to as the "lower side."

[0010] In the following embodiments, 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 simply names used to describe the relative positional relationships of the various components, and the actual positional relationships may be other than those indicated by these names. For the sake of explanation, FIG. 2 shows cross sections at different circumferential positions on both the left and right sides of the central axis J. In the following embodiments, the radial direction corresponds to a "first direction" perpendicular to the axial direction.

[0011] The pump 100 of this embodiment shown in Figures 1 and 2 is a water pump that pumps water. As shown in Figure 2, the pump 100 of this embodiment includes a rotor 10, a stator 20, a fixed shaft 30, a pump section 40, a housing 50, a holding member 80, a conductive member 90, a substrate 95, and electronic components 96. The housing 50 includes a first housing 60 made of resin, a second housing 70, and a cover member 51. In other words, the pump 100 includes the first housing 60, the second housing 70, and the cover member 51. In this embodiment, the first housing 60 corresponds to a "resin housing."

[0012] The rotor 10 is rotatable about a central axis J. The rotor 10 includes a rotor core 11, magnets 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 is annular and surrounds the central axis J. The magnets 12 are fixed to the radially outer surface of the rotor core 11. A plurality of magnets 12 are provided at intervals in the circumferential direction. In this embodiment, eight magnets 12 are provided.

[0013] The first resin portion 13 has a generally cylindrical shape that surrounds the central axis J and extends in the axial direction. As shown in Fig. 2, the first resin portion 13 covers the rotor core 11 and the plurality of magnets 12 from the radially outer side and both axially. The rotor core 11 and the plurality of magnets 12 are embedded in the first resin portion 13. In this embodiment, the first resin portion 13 is made 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 generally cylindrical shape that surrounds the central axis J and extends in the axial direction. The second resin portion 14 is located radially inside the rotor core 11. The second resin portion 14 covers the radially inside surface of the rotor core 11. The second resin portion 14 has a portion that axially sandwiches the first resin portion 13. The second resin portion 14 is fixed to the first resin portion 13. In this embodiment, the second resin portion 14 is produced by insert molding using a molded body including the rotor core 11, the plurality of magnets 12, and the first resin portion 13, which are integrally molded by insert molding, and the guide member 15 as an insert member.

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

[0016] The stator 20 faces the rotor 10 in the radial direction via a gap. More specifically, the stator 20 faces the rotor 10 in the radial direction via a gap 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 stator 20 is entirely embedded in the first housing 60. The stator 20 has a stator core 21, an insulator 22 attached to the stator core 21, and a plurality of coils 23 attached to the stator core 21 via the insulator 22.

[0017] The stator core 21 is located radially outward of the rotor core 11 and the plurality of magnets 12 and surrounds the rotor core 11 and the plurality of magnets 12. The stator core 21 is formed, for example, by stacking a plurality of plate members in the axial direction. The plurality of plate members constituting the stator core 21 are, for example, electromagnetic steel plates. At least a portion of the stator core 21 is embedded and held in a first housing 60 made of resin. In this embodiment, the stator core 21 is entirely embedded in the first housing 60. As shown in FIG. 3 , the stator core 21 has an annular core back 24 surrounding the rotor 10, a plurality of teeth 25 extending radially inward from the core back 24, and a protrusion 26 protruding radially outward from the core back 24.

[0018] The core back 24 has a substantially circular ring shape centered on the central axis J. The radial dimension between the inner peripheral surface and the outer peripheral surface of the core back 24, i.e., the radial thickness of the core back 24, is smaller than the circumferential dimension of the portions of the teeth 25 that connect to the core back 24, i.e., the radially outer ends of the teeth 25. The multiple teeth 25 are arranged at intervals in the circumferential direction. More specifically, the multiple teeth 25 are arranged at equal intervals around one circumferential circumference. In this embodiment, six teeth 25 are provided.

[0019] The protrusion 26 has a generally trapezoidal shape with a circumferential dimension that increases radially outward when viewed in the axial direction. As shown in FIG. 4 , in this embodiment, the axial dimension of the protrusion 26 is the same as the axial dimension of the core back 24 and the axial dimension of the teeth 25. The protrusion 26 has a core recess 26 a recessed radially inward from the radially outer surface of the protrusion 26. In this embodiment, the core recess 26 a is a groove that extends axially and opens to both axial sides. The interior of the core recess 26 a has a generally rectangular shape when viewed in the axial direction. The core recess 26 a is provided in the circumferential center of the radially outer surface of the protrusion 26. As shown in FIG. 2 , the upper portion of the interior of the core recess 26 a is filled with resin that constitutes the first housing 60. The lower portion of the interior of the core recess 26 a is a void that is not filled with resin.

[0020] As shown in FIG. 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 circumferentially adjacent teeth 25. Therefore, even when the protrusions 26 are provided, 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 a circumferential center of a portion of the core back 24 located between circumferentially adjacent teeth 25. The four protrusions 26 include a pair of protrusions 26 arranged with one tooth 25 sandwiched between them in the circumferential direction, and a pair of protrusions 26 arranged with another tooth 25 sandwiched between them in the circumferential direction. 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 on either side of the central axis J. The coils 23 are attached to the teeth 25 via insulators 22. The coils 23 are electrically connected to a substrate 95 via first conductive members 90a, which will be described later.

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

[0022] A plurality of support portions 27 are provided at intervals in the circumferential direction. The plurality of support portions 27 include three first support portions 27a and one second support portion 27b. The first support portion 27a is a portion that holds a 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 in the radial direction. The slit 27c is open to the upper side. A lead wire 23a drawn from the coil 23 is passed through the slit 27c. The second support portion 27b is a portion that holds a 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 has a generally cylindrical shape extending in the axial direction about the central axis J. The fixed shaft 30 is located radially inside the guide member 15 of the rotor 10. The fixed shaft 30 passes through the radially inside of the guide member 15 in the axial direction. The fixed shaft 30 protrudes beyond the guide member 15 on both sides in the axial direction. The fixed shaft 30 is clearance-fitted into the radially inside of the guide member 15. The fixed shaft 30 supports the inner circumferential surface of the guide member 15, thereby rotatably supporting the rotor 10.

[0024] The upper end of the fixed shaft 30 is embedded and held in an axial wall portion 64a (described later) of the first housing 60. The fixed shaft 30 extends downward from the axial wall portion 64a. The lower end of the fixed shaft 30 is located below a rotor accommodating portion 64 (described later). A pair of shaft recesses 31 are provided in the portion of the fixed shaft 30 embedded in the axial wall portion 64a, with the central axis J sandwiched between them in the radial direction. As part of the resin that constitutes the axial wall portion 64a is positioned within the pair of shaft recesses 31, the fixed shaft 30 is prevented from coming off the axial wall portion 64a.

[0025] The pump portion 40 is connected to the lower side of the rotor 10. In this embodiment, the pump portion 40 is an impeller. When the rotor 10 rotates about the central axis J, the pump portion 40 rotates about the central axis J. The pump portion 40 is made of resin. The pump portion 40 has an impeller main body 41, a shroud 42, and a plurality of blades 43. In this embodiment, the impeller main body 41 is connected to the lower end of the second resin portion 14. The second resin portion 14 and the impeller main body 41 are part of the same single member. The impeller main body 41 is formed simultaneously when the second resin portion 14 is formed by insert molding. The impeller main body 41 is generally disk-shaped and centered on the central axis J. The outer diameter of the impeller main body 41 is larger than the outer diameter of the second resin portion 14 at its lower end.

[0026] The shroud portion 42 is separate from the impeller main body portion 41. The shroud portion 42 is arranged below the impeller main body portion 41 with a gap therebetween. The shroud portion 42 is annular and centered on the central axis J. The plurality of blade portions 43 are located axially between the impeller main body portion 41 and the shroud portion 42. The plurality of blade portions 43 are arranged with a gap therebetween in the circumferential direction. The lower ends of the plurality of blade portions 43 are connected to the shroud portion 42. In this embodiment, the shroud portion 42 and the plurality of blade portions 43 are part of the same single member. The upper ends of the plurality of blade portions 43 are in contact with the impeller main body portion 41.

[0027] 1 and 8, in this embodiment, the first housing 60 is a substantially cylindrical member centered on the central axis J. As shown in Fig. 2, the first housing 60 has a rotor accommodating portion 64 that accommodates the rotor 10 therein, and a board accommodating portion 65 that accommodates the board 95 therein.

[0028] The rotor accommodating portion 64 is cylindrical and surrounds the central axis J, opening downward. In this embodiment, the rotor accommodating portion 64 is generally cylindrical and centered on the central axis J, opening downward. The rotor accommodating portion 64 has an axial wall portion 64a and a peripheral wall portion 64b. The axial wall portion 64a is the upper wall portion of the walls that make up the rotor accommodating portion 64. In this embodiment, the axial wall portion 64a is circular and centered on the central axis J, as 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 axially separates the interior of the rotor accommodating portion 64 from the interior of the substrate accommodating portion 65. The upper end of the fixed shaft 30 is embedded in the axial wall portion 64a.

[0029] The axial wall portion 64a has a first recess 69 recessed downward from the upper surface of the axial wall portion 64a. In other words, the first housing 60 has the first recess 69 recessed downward. As shown in FIG. 9 , in this embodiment, the first recess 69 is annular and surrounds the central axis J. More specifically, the first recess 69 is annular and centered on the central axis J. As shown in FIG. 2 , the provision of the first recess 69 makes it easy to suitably reduce the wall thickness of the first housing 60. This makes it less likely for sink marks to occur when the first housing 60 is insert-molded. 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 axially separates the interior of the first recess 69 from the interior of the rotor accommodating portion 64. The first recess 69 is located radially inward of a base portion 81 (described later) of the retaining member 80.

[0030] The axial wall portion 64a has a shaft holding portion 64c that holds the fixed shaft 30. The shaft holding portion 64c is a portion of the axial wall portion 64a that is located radially inward of the first recess 69. In this embodiment, the shaft holding portion 64c is cylindrical and extends in the axial direction centered on 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 that is 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 accommodating portion 64, except for the lower end.

[0031] The peripheral wall portion 64b is a portion of the wall portion constituting the rotor accommodating portion 64 that is located radially outward of the rotor 10. The peripheral wall portion 64b extends downward from the radial outer peripheral edge portion of the axial wall portion 64a. The peripheral wall portion 64b is tubular and surrounds the central axis J, opening downward. More specifically, the peripheral wall portion 64b is substantially cylindrical and centered on the central axis J, opening downward. The stator 20 is embedded in the peripheral wall portion 64b. In this embodiment, the radial dimension between the radially inner surface and the radially outer surface of the peripheral wall portion 64b is greater than the axial dimension of the axial wall portion 64a.

[0032] The board accommodating portion 65 is located above the rotor accommodating portion 64. The board accommodating portion 65 is cylindrical and surrounds the central axis J, opening upward. Of the walls that make up the board accommodating portion 65, the lower wall is the axial wall portion 64a. A cover member 51 is fixed to the upper end of the board accommodating portion 65. The cover member 51 closes the upper opening of the board accommodating portion 65. As shown in FIG. 1 , the cover member 51 is provided with a connector portion 52 that protrudes upward.

[0033] As shown in FIG. 2 , a substrate 95 is accommodated inside the substrate accommodating portion 65. As a result, the substrate 95 is accommodated 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 plate surface of the substrate 95 faces the axial direction. The substrate 95 is, for example, substantially disk-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 attached to the substrate 95. The electronic component 96 is attached to 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 escape into the first recess 69, thereby preventing the pump 100 from becoming larger in size in the axial direction. In this embodiment, the electronic component 96 is inserted into the first recess 69 from above, and a portion of the electronic component 96 is housed inside the first recess 69. Note that multiple electronic components 96 may be provided. In this case, the multiple electronic components 96 may include electronic components of different types. Furthermore, when multiple electronic components 96 are provided, the phrase "at least a portion of the electronic component 96 is housed inside the first recess 69" may mean that at least a portion of at least one electronic component 96 is housed inside the first recess 69.

[0035] As shown in FIG. 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 FIG. 2 , the upper end of the large-diameter housing portion 61 is located higher than the upper end of the stator core 21. The large-diameter housing portion 61 is formed by a portion 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 portion 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 formed by a portion of the peripheral wall portion 64b and a board accommodating portion 65.

[0036] As shown in FIG. 1 , a step portion 63 having an upwardly facing step surface 63a is provided on the radially outer surface of the first housing 60 between the large-diameter housing portion 61 and the small-diameter housing portion 62 in the axial direction. In this embodiment, the step surface 63a is a flat surface perpendicular to the axial direction. The step surface 63a has a substantially annular shape centered on the central axis J. The step surface 63a is the upper end surface of the upper end of the large-diameter housing portion 61, at a portion located radially outward from the small-diameter housing portion 62.

[0037] As shown in Fig. 8, the radially outer edge portion on the lower surface of the first housing 60 is a first welded-fixing portion 67. The first welded-fixing portion 67 is a portion that is fixed to the second housing 70 by welding. The first welded-fixing portion 67 has an annular shape that surrounds the central axis J. More specifically, the first welded-fixing portion 67 has an annular shape centered on the central axis J.

[0038] The first housing 60 has a third recess 66a 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. That is, 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 has an annular shape centered on the central axis J. A plurality of 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 to the first welded fixing portion 67.

[0039] As shown in Figures 2 and 10, each third recess 66a is disposed at a position overlapping the radially outer portion of each protrusion 26 in the axial direction. As shown in Figure 10, the third recess 66a extends in the circumferential direction when viewed in the axial direction. In this embodiment, the third recess 66a has a substantially rectangular shape when viewed in the axial direction. When viewed in the axial direction, the third recess 66a overlaps the interior of the core recess 26a provided in the protrusion 26 and portions of the protrusion 26 located on both circumferential sides of the core recess 26a. 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 greater than the circumferential dimension of the core recess 26a.

[0040] 2, the upper end of the third recess 66a is located below the upper end of the protruding portion 26 and above the lower end of the protruding portion 26. A lower portion of the radially outer portion of the protruding portion 26 is located inside the upper portion of the third recess 66a. The interior of the third recess 66a includes a lower portion of the interior of the core recess 26a.

[0041] 10 , a portion of the outer surface of the stator core 21 is exposed inside the third recess 66a. In the present 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 the present embodiment, the first exposed surface 21a, the second exposed surface 21b, and the third exposed surface 21c are provided on the protrusion 26. In the present embodiment, the entire outer surface of the stator 20, excluding the first exposed surface 21a, the second exposed surface 21b, and the third exposed surface 21c, is covered with the resin that constitutes the first housing 60.

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

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

[0044] The third exposed surfaces 21c are surfaces facing the circumferential direction. In the present embodiment, the third exposed surfaces 21c are provided on portions of the inner surface of the core recess 26a located on both sides in the circumferential direction. The pair of third exposed surfaces 21c face each other with a gap in the circumferential direction. The pair of third exposed surfaces 21c are lower portions of the portions of the inner surface of the core recess 26a located on both sides in the circumferential direction.

[0045] As shown in Figure 8, the first housing 60 has a fourth recess 66b recessed upward from the lower surface of the first housing 60. In this embodiment, the fourth recess 66b has an annular shape surrounding the central axis J. More specifically, the fourth recess 66b has an annular shape centered on the central axis J. The fourth recess 66b is located radially inward of the third recess 66a. The fourth recess 66b is located adjacent to and radially inward 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 recessed upward from the lower surface of the first housing 60. The fifth recess 66c is located radially inward of the fourth recess 66b. The fifth recess 66c is provided on the radially inner edge of the lower surface of the first housing 60. The fifth recess 66c is annular and surrounds the central axis J. More specifically, the fifth recess 66c is annular and centered on the central axis J. The fifth recess 66c opens radially inward. A portion of the lower surface of the first housing 60 that is 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 recessed 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. A plurality of sixth recesses 61a are provided at intervals in the circumferential direction. The plurality of sixth recesses 61a are arranged at equal intervals around the circumference. As shown in FIG. 3 , the sixth recess 61a is provided at a different circumferential position from the protruding portion 26. At least one sixth recess 61a is provided radially outward from a portion of the core back 24 located between two circumferentially adjacent protruding portions 26. By providing the sixth recess 61a, the radial thickness of the portion of the first housing 60 covering, from the radially outer side, the portion of the core back 24 located at a different circumferential position from the protruding portion 26 can be reduced. This makes it possible to reduce the occurrence of sink marks when insert-molding the first housing 60. Furthermore, by providing the sixth recess 61a, the weight of the first housing 60 can be reduced.

[0048] As shown in FIG. 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 that surrounds the central axis J and an annular wall portion 72 that protrudes upward from the radial 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 of the pump portion 40. The annular wall portion 72 is fixed to the first housing 60. The pump portion 40 is accommodated 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 radial inner edge portion of the bottom wall portion 71. In this embodiment, the intake port 74a is substantially cylindrical and centered on 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 inward of the third recess 66a. In other words, in this embodiment, the third recess 66a is located radially outward of the flow path portion 76. The third recess 66a is located in a position that does not 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 FIG. 1 , the second housing 70 has a discharge port 74b. The discharge port 74b is cylindrical and extends from the annular wall portion 72 in a direction perpendicular to the axial direction. The downstream end of the flow path portion 76 is connected to the discharge port 74b. When the rotor 10 rotates, the pump portion 40 rotates, and water is drawn into the pump portion 40 through the suction 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 through the discharge port 74b. Note that a portion of the water drawn in through the suction port 74a also flows into the rotor accommodating portion 64.

[0051] As shown in FIG. 2 , the second housing 70 has a support portion 75 that supports the rotor 10 from below. The support portion 75 has a support main body portion 75a and multiple leg portions 75b. The support main body portion 75a supports the rotor 10 from below via a washer 32. The fixed shaft 30 passes axially through the inside of the washer 32. The washer 32 contacts the upper end of the support main body portion 75a and the lower end of the guide member 15. The multiple leg portions 75b extend upward from the inner circumferential surface of the suction port 74a. The upper ends of the multiple leg portions 75b are connected to the support main body portion 75a.

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

[0053] There are no particular limitations on the welding method used to secure the first welded fixing portion 67 and the second welded fixing portion 77 to each other. Examples of welding methods that can be used to secure the first welded fixing portion 67 and the second welded fixing portion 77 to each other include infrared welding, ultrasonic welding, laser welding, and spin welding.

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

[0055] As shown in Fig. 7 , the holding member 80 has a base 81, a first protrusion 83, and a second protrusion 88. The base 81 is annular and surrounds the central axis J. More specifically, the base 81 is annular and centered on the central axis J. As shown in Figs. 11 and 12 , the base 81 has a plate-like portion 81a whose plate surface faces the axial direction, 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 and centered on the central axis J.

[0056] As shown in FIG. 7 , the first protrusion 83 protrudes upward from the base 81. In this embodiment, the first protrusion 83 has a rectangular shape that is long in a direction perpendicular to the radial direction passing through the circumferential center of the first protrusion 83 when viewed in the axial direction. A plurality of first protrusions 83 are provided at intervals in the circumferential direction. Each of the plurality of first protrusions 83 includes three first protrusions 83a and one first protrusion 83b. The three first protrusions 83a are arranged at equal intervals around the circumference. When viewed in the axial direction, the dimension of the first protrusion 83a in the direction in which the first protrusion 83a extends is larger than the dimension of the first protrusion 83b in the direction in which the first protrusion 83b extends.

[0057] The second protrusions 88 protrude downward from the base 81. In this embodiment, the second protrusions 88 have a generally trapezoidal shape with a circumferential dimension that decreases radially inward when viewed in the axial direction. A plurality of second protrusions 88 are provided at intervals in the circumferential direction. In this embodiment, five second protrusions 88 are provided. The plurality of second protrusions 88 includes two or more second protrusions 88 with different circumferential dimensions. As shown in FIG. 2 , the second protrusions 88 are embedded in the first housing 60. This allows the wall thickness of the portion of the first housing 60 located above the stator 20 to be suitably reduced. This makes it less likely that sink marks will occur when the first housing 60 is insert-molded. In this embodiment, the provision of the second protrusions 88 allows the axial dimension of the portion of the axial wall 64a located axially between the stator 20 and the second protrusions 88 to be suitably reduced, for example.

[0058] For example, the 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 in the mold for insert-molding the first housing 60. However, in this case, when insert-molding the first housing 60, it is necessary to accurately position a portion of the mold with respect to the retaining member 80, which requires improving the dimensional accuracy of the mold, and this tends to increase the cost of manufacturing the first housing 60 by insert molding. In contrast, in the present embodiment, the second protrusion 88 provided on the retaining member 80 can reduce the thickness of the portion of the first housing 60 located above the stator 20, thereby suppressing an increase in the cost of manufacturing the first housing 60 by insert molding compared to when the recess is provided instead of the second protrusion 88.

[0059] In this embodiment, the retaining member 80 has a second recess 88a recessed downward. The second recess 88a is recessed downward from the upper surface of the base 81. The second recess 88a is located at a position overlapping the second protrusion 88 when viewed in the axial direction. Therefore, the second recess 88a allows the thickness of the portion of the retaining member 80 that constitutes the second protrusion 88 to be reduced. This prevents sink marks from occurring during molding of the retaining member 80, even when the second protrusion 88 is provided. Furthermore, the second recess 88a reduces the weight of the retaining member 80, thereby reducing the weight of the pump 100. In this embodiment, the second recess 88a allows the second protrusion 88 to have a hollow box-like shape that is open upward.

[0060] As shown in FIG. 7 , in this embodiment, the holding member 80 has a first through hole 86 that penetrates the holding member 80 in the axial direction. In this embodiment, the first through hole 86 penetrates the plate-shaped portion 81 a of the base 81 in the axial direction. When viewed in the axial direction, the first through hole 86 has a generally rectangular shape that is elongated in a direction perpendicular to the radial direction passing through the circumferential center of the first through hole 86. A plurality of first through holes 86 are provided at intervals in the circumferential direction. The plurality of first through holes 86 are located radially outward of the plurality of first protrusions 83. In this embodiment, when viewed in the axial direction, each first through hole 86 extends in the same direction as each first protrusion 83 located radially inward. When the first protrusions 83 and the first through holes 86 are arranged side by side in the radial direction, the dimension of the first through hole 86 in the extending direction of the first through hole 86 is larger than the dimension of the first protrusions 83 in the extending direction of the first protrusions 83. In this embodiment, the multiple first through holes 86 include three first through holes 86a located radially outside the three first protrusions 83a, and one first through hole 86b located radially outside one first protrusion 83b.

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

[0062] The holding member 80 has fourth through holes 84 that penetrate the holding member 80 in the axial direction. In this embodiment, the fourth through holes 84 axially penetrate the first protrusions 83 and the plate-shaped portion 81a of the base 81. A fourth through hole 84 is provided for each first protrusion 83. When viewed in the axial direction, each fourth through hole 84 has a slit shape that extends in the direction in which the first protrusion 83 extends. The upper surface of each first protrusion 83 has a rectangular frame shape when viewed in the axial direction due to the opening of each fourth through hole 84. The fourth through holes 84 include three fourth through holes 84a that penetrate three first protrusions 83a in the axial direction, respectively, and one fourth through hole 84b that penetrates one first protrusion 83b in the axial direction. When viewed in the axial direction, the dimension of the fourth through hole 84a in the direction in which the fourth through hole 84a extends is larger than the dimension of the fourth through hole 84b in the direction in which the fourth through hole 84b extends.

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

[0064] As shown in FIG. 12 , each snap-fit ​​portion 85 includes an extension 85c extending downward from the edge of the first through hole 86 and a claw 85d protruding from the extension 85c in a radial direction perpendicular to the axial direction, i.e., a first direction. In other words, the retaining member 80 includes the extension 85c and the claw 85d. The extension 85c extends downward from a radially outer portion of the lower surface of the plate-shaped portion 81a at the edge of the first through hole 86. The extension 85c is connected to a circumferentially central portion of the radially outer portion of the edge of the first through hole 86. The extension 85c has a generally rectangular plate shape with its plate surface facing the radial direction. The extension 85c is elastically deformable in the radial direction, i.e., the first direction, along which the claw 85d protrudes. As shown in FIG. 13 , the lower end of the extension 85c contacts the upper end of the support portion 27. The lower end of the extension 85c of each snap fit portion 85 contacts the upper end of each support portion 27, so that the retaining member 80 is positioned axially relative to the stator 20 and is supported 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 inner 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 molding the holding member 80 using a mold, a portion of the mold molding the claw portion 85d can be removed upward through the first through hole 86a. This makes it easy to mold the claw portion 85d using a mold. As shown in FIG. 12 , the claw portion 85d extends in the same direction as the first through hole 86a that 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 slopes upward as it extends radially inward.

[0066] The holding member 80 has conductive member holding portions 89 that hold the conductive members 90. As shown in FIG. 5 , a plurality of conductive member holding portions 89 are provided at intervals in the circumferential direction. Each conductive member holding 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 holding portions 89 are provided. In each conductive member holding portion 89 and the conductive member 90 held by each conductive member holding portion 89, a direction perpendicular to both the axial direction and the radial direction passing through the circumferential center of the conductive member holding portion 89 is referred to as the width direction D, and is indicated by the D axis in FIGS. 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 portions 85 d extend when viewed in the axial direction. In this embodiment, the width direction D corresponds to a "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 FIG. 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 a respective conductive member holding portion 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 FIG. 11 , the first conductive member 90a has a first portion 91, a second portion 92, and a third portion 93. The first portion 91 has an exposed portion 97a (described later). The first portion 91 has an inserted portion 91a and a terminal portion 91b. The inserted portion 91a has a substantially rectangular plate shape with its plate surface facing radially. The inserted portion 91a is inserted into the fourth through hole 84a from below and penetrates the base 81 in the axial direction. The inserted portion 91a is, for example, lightly press-fit into the fourth through hole 84a. As shown in FIG. 13 , the upper end of the inserted portion 91a protrudes upward from the first protrusion 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 FIG. 11 , a pair of terminal portions 91b are provided with a gap 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 in the radial direction. 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 portion 92 is connected to the coil 23. The radial position of the second portion 92 is different from the radial position of the first portion 91. In this embodiment, the second portion 92 is located radially outward of the first portion 91. The second portion 92 is located below the first through hole 86a. The second portion 92 has a supported portion 92a, a connecting portion 92b, and a pair of flange portions 92c. The supported portion 92a is plate-shaped with its plate surface facing radially. The supported portion 92a has a second through hole 92d that penetrates the supported portion 92a in the radial direction. In other words, the second portion 92 has the second through hole 92d that penetrates the second portion 92 in the radial direction. When viewed radially, the second through hole 92d has a generally rectangular shape that is elongated in the width direction D. The claw portion 85d is inserted into the second through hole 92d from the radially outer side. The upper surface of the claw portion 85d faces an upper portion of the inner edge of the second through-hole 92d in the axial direction. In this embodiment, the claw portion 85d is hooked from below onto the inner edge of the second through-hole 92d, and thereby hooked from below onto the first conductive member 90a.

[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 arranged to sandwich a 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 plate surfaces facing in the radial direction.

[0072] The connecting portion 92b extends downward from the supported portion 92a. The connecting portion 92b is plate-shaped with its plate surface facing radially. In this embodiment, the connecting portion 92b is a rectangular plate extending in the axial direction. The dimension of the width direction D of the connecting portion 92b is smaller than the dimension of the width direction D of the supported portion 92a. As shown in FIG. 13 , the connecting portion 92b is inserted into the first supporting portion 27a from above. The connecting portion 92b contacts the lead wire 23a inside the first supporting portion 27a. This electrically connects the first conductive member 90a to the coil 23.

[0073] The third portion 93 protrudes radially (in the first direction) from the first portion 91 and connects to the second portion 92a. In this embodiment, the third portion 93 protrudes radially outward from the lower end of the inserted portion 91a and connects to the upper end of the supported portion 92a. As shown in FIG. 11 , the third portion 93 is plate-shaped with its plate surface facing the axial direction. More specifically, the third portion 93 is a generally rectangular plate that is elongated in the width direction D. The third portion 93 is disposed below the first through-hole 86a, facing and spaced from it.

[0074] The second conductive member 90b is a conductive member 90 that contacts the stator core 21. As shown in FIG. 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 a shape similar to that of 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 manner 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 similar to those of the first portion 91.

[0075] The connection portion 94e of the second portion 94b is inserted into the second support portion 27b from above. The connection portion 94e passes through the interior of the second support portion 27b and is inserted from above into a hole (not shown) provided in the stator core 21. This brings the connection portion 94e into contact with the stator core 21. By bringing the connection portion 94e into contact 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 connection portion 94e is, for example, a press-fit terminal. The other configurations of the second portion 94b are similar to those of the second portion 92. The third portion 94c is similar to the third portion 93.

[0076] As shown in FIG. 13 , in this embodiment, a portion of the holding member 80 and a portion of the conductive member 90 are exposed inside the board accommodating portion 65. The first conductive member 90a has an exposed portion 97a that protrudes upward from the holding member 80 and is exposed inside the board accommodating portion 65. The exposed portion 97a is composed of a portion of the insertion portion 91a that protrudes above the first protrusion 83a and a pair of terminals 91b. As shown in FIG. 9 , the second conductive member 90b has an exposed portion 97b that protrudes upward from the holding member 80 and is exposed inside the board accommodating portion 65. The exposed portion 97b is similar to the exposed portion 97a except that it has only one terminal 94d. In the following description, unless a distinction is made between the exposed portions 97a and 97b, the exposed portions 97a and 97b will be collectively referred to as exposed portions 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] In the holding member 80, the entire upward-facing surface of the base 81 excluding the radially outer peripheral edge portion, and the multiple first protrusions 83 are exposed inside the substrate accommodating portion 65. As a result, the portion of the upward-facing surface of the holding member 80 surrounding the exposed portion 97 is exposed inside the substrate accommodating portion 65. In the present embodiment, the upward-facing surface of the holding member 80 includes the upper surface of the base 81 and the upper surfaces of the multiple first protrusions 83. In the present embodiment, the portion of the upward-facing surface of the holding member 80 surrounding the exposed portion 97 includes the upper surfaces of the first protrusions 83 and the portion of the upward-facing surface of the base 81 surrounding the first protrusions 83. As a result, the portion of the upward-facing surface of the base 81 surrounding the first protrusions 83 is exposed inside the substrate accommodating portion 65.

[0078] The portion of the upward-facing surface of the base 81 excluding the radially outer peripheral edge, i.e., the portion exposed inside the substrate accommodating portion 65, is an exposed surface 81c exposed inside the substrate accommodating portion 65. In other words, the upward-facing surface of the base 81 has the exposed surface 81c. The exposed surface 81c surrounds the central axis J. In this embodiment, the exposed surface 81c is a substantially annular shape centered on the central axis J. The exposed surface 81c is a surface perpendicular to the axial direction. The exposed surface 81c includes portions surrounding each of the multiple first protrusions 83.

[0079] As shown in FIGS. 13 and 14 , the first through-hole 86 provided in the base 81 is exposed inside the board accommodating portion 65. The upper end of the first through-hole 86 opens to the exposed surface 81c. A hole 64e provided in the first housing 60 is provided below the first through-hole 86. That is, the first housing 60 has the hole 64e. The hole 64e is connected to the lower side of the first through-hole 86. The hole 64e 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 FIG. 15 , at least a portion of the top surface 93a of the third portion 93 facing upward and at least a portion of the side surface 93b of the third portion 93 facing the width direction D are exposed inside the hole 64e. In the present embodiment, a radially outer portion of the top surface 93a and 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 a bottom surface, which is located on the lower side of the inner surface of the hole 64e.

[0080] In FIG. 9 , the outer edge of the holding member 80 is indicated by a dashed line. As shown in FIG. 9 , the upper surface of the radially outer edge of the holding member 80 is covered from above by a portion of the first housing 60 around the entire circumference. As shown in FIG. 13 , a pressing portion 65a, which is part of a wall constituting the board accommodating portion 65, contacts the upper surface of the radially outer edge of the holding member 80. That is, the first housing 60 has the pressing portion 65a that contacts the upper surface of the radially outer edge of the holding member 80. The pressing portion 65a is annular and surrounds the central axis J. In this embodiment, the pressing portion 65a is cylindrical and centered on the central axis J, opening upward. The provision of the pressing portion 65a prevents the holding member 80 embedded in the first housing 60 from shifting upward. As shown in FIG. 16 , the pressing portion 65a is located radially outward of the third through-hole 87.

[0081] In this embodiment, the holding 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 that is located radially inward of the pressing portion 65a and protrudes above the holding member 80 through the third through-hole 87. In other words, the first housing 60 has the protruding support portion 68 that protrudes above the holding member 80 through the third through-hole 87. The protruding support portion 68 is exposed inside the board accommodating portion 65 and supports the board 95. This allows the board 95 to be stably held within the board accommodating portion 65. Furthermore, because the board 95 can be supported by the protruding support portion 68, which is part of the first housing 60, displacement of the relative position of the board 95 with respect to the first housing 60 can be suppressed even if the holding member 80 is deformed. This prevents displacement of the relative position of the conductive member 90, a portion of which is embedded in the first housing 60, and the board 95. Therefore, the substrate 95 and the conductive member 90 can be easily and suitably connected.

[0082] The protruding support portion 68 has a generally cylindrical shape extending in the axial direction. The protruding support portion 68 is axially inserted into a hole portion 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 protrusion portion 68c. The small diameter portion 68a is connected to the axial wall portion 64a. The small diameter portion 68a is located inside the third through hole 87. The small diameter portion 68a fills 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 holding member 80. This further prevents the holding member 80 from shifting upward relative to the first housing 60. Furthermore, because the large diameter portion 68b presses the holding member 80 from above, it is possible to prevent deformation such as upward warping of a portion of the holding member 80 that is located radially inward of the portion pressed from above by the pressing portion 65a. In this embodiment, the outer peripheral edge portion at the lower end of the large diameter portion 68b contacts the entire periphery of the third through-hole 87 on the upper surface of the base 81.

[0083] The outer peripheral edge of the upper end of the large diameter portion 68b contacts the peripheral edge of the hole portion 95b on the lower surface of the substrate 95. As a result, the protruding support portion 68 supports the substrate 95 from below. The protruding portion 68c is connected to the upper side of the large diameter portion 68b. The upper end of the protruding portion 68c is the upper end of the protruding support portion 68. The outer diameter of the protruding portion 68c is smaller than the outer diameter of the large diameter portion 68b and the inner diameter of the hole portion 95b. The protruding portion 68c is passed 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 FIG. 9 , in this embodiment, three protruding support portions 68 are provided at intervals in the circumferential direction.

[0084] The manufacturing method for the pump 100 of the present embodiment described above includes a step of assembling the stator 20, the holding member 80, and the conductive members 90 to produce the assembly 110 shown in FIG. 5 . As shown in FIG. 6 , an operator brings the plurality of conductive members 90 close to the stator 20 from above and attaches each conductive member 90 to each support portion 27. The operator inserts the connecting portion 92b of the first conductive member 90a into the first support portion 27a from above, thereby electrically connecting the first conductive member 90a to the lead wire 23a. The operator inserts the connecting portion 94e of the second conductive member 90b into the second support portion 27b from above, thereby electrically connecting the second conductive member 90b to the stator core 21. When inserting the connection portions 92b, 94e of each conductive member 90 into each support portion 27, an operator or the like passes a jig through the second through-hole 92d provided in the conductive member 90 and uses the jig to press downward the lower portion of the inner edge of the second through-hole 92d, thereby suitably pushing the connection portions 92b, 94e of each conductive member 90 into each support portion 27. This makes it easier to attach each conductive member 90 to each support portion 27.

[0085] After attaching each conductive member 90 to the stator 20, the worker or the like brings the holding member 80 closer to the stator 20 holding the conductive members 90, as shown in FIG. 7 . The worker or the like moves the holding member 80 closer to the stator 20 while passing the first portions 91, 94a of each conductive member 90 through the corresponding fourth through-holes 84. When the holding member 80 is brought closer to the stator 20 to a certain extent, the claws 85d of the snap-fit ​​portion 85 contact the upper ends of the second portions 92, 94b, and the snap-fit ​​portion 85 receives a radially outward force. This causes the extensions 85c to elastically deform radially outward. When the holding member 80 is brought further closer to the stator 20 in this state, the extensions 85c are restored to their original shape radially inward at a position where the claws 85d face the second through-holes 92d, and the claws 85d are inserted into the second through-holes 92d. As a result, each conductive member 90 is held by the holding member 80 with a snap-fit ​​structure. Therefore, by assembling the holding member 80 and each conductive member 90 so that they approach each other in the axial direction, each conductive member 90 can be easily and stably held by the holding member 80.

[0086] The worker or the like moves the holding member 80 axially toward 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 FIG. 13 , when the lower end of the extension portion 85c contacts the upper end of the support portion 27, the claw portion 85d is spaced downward from the upper portion of the inner edge of the second through hole 92d. Therefore, by moving the holding member 80 toward the stator 20 until the extension portion 85c abuts against the support portion 27, the worker or the like 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 for each conductive member 90 to be held by the holding member 80. In this manner, the assembly 110 including the stator 20, the holding member 80, and the conductive member 90 is assembled.

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

[0088] The mold M2 is located vertically below the mold M1. The mold M2 has a mold base M2a, a shaft support M2b protruding upward from the radial center of the mold base M2a, a side wall M2c protruding upward from the radial outer edge of the mold base M2a, and a support pin P protruding upward from the mold base M2a. The shaft support M2b has a support hole M2d recessed downward from the upper surface of the shaft support M2b. The fixed shaft 30 is fitted into and held in the support hole M2d. This allows the fixed shaft 30 to be supported by the mold M2 when the first housing 60 is insert-molded.

[0089] The support pin portion P protrudes upward from a portion of the mold base portion M2a that is located radially between the shaft support portion M2b and the side wall portion M2c. A plurality of 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 protrusion 26 from below. By supporting the plurality of protrusions 26 from below with the plurality of support pin portions P, the stator core 21 can be supported relative to the mold M2. This allows the stator 20 to be supported by the mold M2 when the first housing 60 is insert-molded.

[0090] 4 and 18, the support pin portion P is, for example, a plate-like portion extending in the axial direction with its plate surface facing in the radial direction. 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 a portion of the inner surface of the core recess 26a that is located radially inward. 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 circumferentially opposite surfaces of the second pin portion P2 contact portions of the inner surface of the core recess 26a that are located circumferentially on both sides. This allows the support pin portion P to support the protrusion 26 in the circumferential direction. The portions of the inner surface of the core recess 26a that come into contact with the surfaces on both circumferential sides of the second pin portion P2 form third exposed surfaces 21c.

[0092] The support pins P can support the protrusions 26 in the axial, radial, and circumferential directions, so that the stator 20 can be supported while being positioned in the axial, radial, and circumferential directions relative to the mold M2. This makes it possible to suitably prevent the stator 20 from shifting position when molding the first housing 60.

[0093] As shown in FIG. 17 , the mold M1 has a mold portion M1a that forms the interior of the substrate accommodating 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 forms the portion of the interior of the substrate accommodating portion 65 that is located above the exposed surface 81c. The upper mold portion M1b has a substantially cylindrical shape centered on the central axis J. The lower surface of the radially outer portion of the upper mold portion M1b contacts the upper surface of the base 81 of the holding member 80. The portion of the upward-facing surface of the base 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 first mold recesses M1d recessed upward from the lower surface of the upper mold portion M1b. Although not shown, four first mold recesses M1d are provided at intervals in the circumferential direction. A first protrusion 83 is fitted into the lower end of each first mold recess M1d. Each first protrusion 83 is fitted into the corresponding first mold recess M1d with no or almost no gap. A portion of each conductive member 90 protruding above the first protrusion 83 is accommodated within each first mold recess M1d. The portion of each conductive member 90 accommodated within the first mold recess M1d is an exposed portion 97. The dimensions of the first mold recess M1d in the axial and radial directions are sufficiently larger than the portion of each conductive member 90 accommodated within the first mold recess M1d. Therefore, a sufficient gap is provided between the portion of the conductive member 90 accommodated in the first mold recess M1d and the inner surface of the first mold recess M1d.

[0095] The upper mold part M1b is provided with a second mold recess M1e recessed upward from the lower surface of the upper mold part M1b. The second mold recess M1e is a portion where the large diameter portion 68b and the protrusion 68c of the protruding support part 68 are formed. The peripheral portion of the second mold recess M1e on the lower surface of the upper mold part M1b contacts the peripheral portion of the third through hole 87 on the upper surface of the base 81 all around. The protruding support part 68 is formed 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 part M1c protrudes downward from the radially inner part of the upper mold part M1b. The lower mold part M1c is the part that forms the interior of the first recess 69 and the shaft holding part 64c. The lower mold part M1c is cylindrical and has its center on the central axis J and is open to the bottom. The upper end of the fixed shaft 30 is inserted into the lower mold part M1c. The shaft holding part 64c that embeds and holds the upper end of the fixed shaft 30 is formed by filling the interior of the lower mold part M1c with resin.

[0097] As shown in FIG. 15 , the mold M1 has a protruding mold portion M1f that protrudes downward from the upper mold portion M1b. The protruding mold portion M1f forms the interior of the hole 64e. The protruding mold portion M1f is inserted through the first through-hole 86 from above. The protruding mold portion M1f has a main body portion M1g and a pair of protrusions 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 in contact with or faces the upper surface 93a of the third portion 93 via a small gap. This allows the protruding mold portion M1f to press the third portion 93 from above. The pair of protrusions M1h are positioned to sandwich the third portion 93 in the width direction D. The pair of protrusions M1h are positioned to contact or face the pair of side surfaces 93b of the third portion 93 via a small gap. This allows the protruding mold portion M1f to press the third portion 93 from both sides in the width direction D. The portion of the third portion 93 pressed by the protruding mold portion M1f is exposed in the hole 64e. Because the third portion 93 can be pressed by the protruding mold portion M1f, it is possible to prevent the position of each conductive member 90 from shifting relative to the first housing 60 even if the conductive members 90 are subjected to pressure caused by filling with resin when molding the first housing 60. Furthermore, because it is possible to prevent the position of each conductive member 90 from shifting, it is possible to further prevent the relative position of each conductive member 90, which is partially embedded in the first housing 60, from shifting relative to the board 95. This allows the terminal portions 91b, 94d of the conductive member 90 to be connected to the board 95 with high precision.

[0098] With the fixed shaft 30 and the assembly 110 supported in the mold M2, the molds M1 and M2 are axially connected to form a cavity C, and resin is poured into the cavity C to form the first housing 60. The locations where the support pin portions P were provided become the third recesses 66a in the first housing 60. As described above, the portions of the support pin portions P that were in contact with the protrusions 26 become exposed surfaces that are exposed inside the third recesses 66a.

[0099] After molding the first housing 60, an operator or the like assembles the rotor 10 and the pump unit 40 to the first housing 60 and then fixes the first housing 60 and the second housing 70 to each other by welding. In this embodiment, before the first housing 60 and the second housing 70 are brought into contact with each other, the first welded fixing portion 67 of the first housing 60 and the second welded fixing portion 77 of the second housing 70 are melted by heat. By bringing the melted 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, the term "workers, etc." includes workers who perform each task and assembly equipment, etc. Each task may be performed by a worker alone, by an assembly equipment alone, or by a worker and an 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 board accommodating portion 65. The portion of the upward-facing surface of the holding member 80 that surrounds the exposed portion 97 is exposed inside the board accommodating portion 65. Therefore, as described above, when insert-molding the first housing 60, the mold M1 can be brought into contact with the peripheral portion of the upward-facing surface of the holding member 80 that surrounds the portion that will become the exposed portion 97 of the conductive member 90. This allows the holding member 80 to close the lower opening of the first mold recess M1d, which accommodates the portion that will become the exposed portion 97 of the conductive member 90, and prevents resin from entering 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 prevent the exposed portion 97 from being covered with resin. Therefore, by making the first mold recess M1d sufficiently large in the axial and radial directions, it is possible to easily insert the exposed portion 97 into the first mold recess M1d. This allows mold M2, which holds assembly 110, to be moved vertically upward and closer to mold M1, allowing exposed portion 97 to be inserted into first mold recess M1d. This reduces the number of steps and time required to manufacture first housing 60 by insert molding. This makes it easier to manufacture first housing 60, improving the productivity of pump 100.

[0102] Furthermore, according to this embodiment, the holding member 80 has a base 81 and a first protrusion 83 protruding upward from the base 81. The exposed portion 97 protrudes upward from the first protrusion 83. The first protrusion 83 is exposed inside the board accommodating portion 65. Therefore, when the first housing 60 is insert-molded, 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 more effectively sealed, and when the first housing 60 is insert-molded, resin can be more effectively prevented from entering the first mold recess M1d. Furthermore, even if resin does enter the first mold recess M1d, the first protrusion 83 can more easily block the resin that has entered. Therefore, the exposed portion 97 can be more effectively prevented from being covered with resin.

[0103] Furthermore, according to this embodiment, the portion of the upward-facing surface of the base 81 that surrounds the first protrusion 83 is exposed inside the board accommodating portion 65. Therefore, when the first housing 60 is insert-molded, the mold M1 can be brought into contact with the portion of the upward-facing surface of the base 81 that surrounds the first protrusion 83. This makes it possible to more effectively prevent resin from entering the first mold recess M1d when the first housing 60 is insert-molded. Therefore, it is possible to more effectively prevent the exposed portion 97 from being covered with resin.

[0104] Furthermore, according to the present embodiment, the base 81 is annular and surrounds the central axis J. The upward-facing surface of the base 81 has an exposed surface 81c that surrounds the central axis J and is exposed inside the board accommodating 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 81 over the entire circumferential direction. In the present embodiment, the lower surface of the radially outer portion of the upper mold part M1b can be brought into contact with the upward-facing surface of the base 81 over the entire circumferential direction. This prevents the mold M1 from becoming too complicated, and allows the exposed portions 97 of the multiple conductive members 90 to be suitably exposed inside the board accommodating portion 65.

[0105] Furthermore, according to this embodiment, the first through-hole 86 is exposed inside the board accommodating portion 65. The first housing 60 has a hole 64e that is connected to the lower side of the first through-hole 86. At least a portion of the top surface 93a, which is the surface of the third portion 93 facing upward, and at least a portion of the side surface 93b, which is the surface of the third portion 93 facing the width direction D, are exposed inside the hole 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 top surface 93a and at least a portion of the side surface 93b. This allows the mold M1 to press down on the third portion 93 in the axial direction and the width direction D when insert-molding the first housing 60, thereby preventing the conductive member 90 from moving within the cavity C. This improves the positional accuracy of the conductive member 90 relative to the first housing 60. Furthermore, the first through-holes 86, which are provided for molding the claw portions 85d, can be used to hold the conductive member 90 with the protruding mold portion M1f. Therefore, there is no need to provide a separate structure in the holding member 80 for holding the conductive member 90 with the mold M1 when insert-molding the first housing 60. This makes it possible to prevent an increase in the cost of manufacturing the holding member 80.

[0106] Furthermore, according to this embodiment, the holding member 80 and the conductive member 90 are molded separately and then assembled together. Therefore, it is easier to fine-tune the relative position of the conductive member 90 with respect to the holding member 80 compared to insert-molding the holding member 80 using the conductive member 90 as an insert member. This makes it easier to hold the multiple conductive members 90 to the holding member 80 while assembling them to the stator 20, even if dimensional deviations occur due to tolerances or the like. Furthermore, in this embodiment, the conductive members 90 are held to the holding member 80 using a snap-fit ​​structure. This prevents an increase in the labor and time required to hold the conductive members 90 to the holding member 80, even if the holding member 80 and the conductive member 90 are molded separately and then assembled. Furthermore, by providing the snap-fit ​​portion 85 having the extension portion 85c and the claw portion 85d on the holding member 80, the conductive members 90 can be easily held to the holding member 80 using a snap-fit ​​structure.

[0107] When molding the holding member 80 using a mold, in order to provide the claw portion 85d, it is necessary to provide the first through hole 86 so that the mold can be removed. Here, for example, if the conductive member 90 is a member that extends straight in the axial direction, it is necessary to provide the first through hole 86 in a position close to the exposed portion 97, and it may be difficult to expose the peripheral portion surrounding the exposed portion 97 on the upper surface of the holding member 80. In contrast, in the present embodiment, the first portion 91 of the conductive member 90 having the exposed portion 97 and the second portion 92 having the second through hole 92d onto which the claw portion 85d is engaged are radially offset from each other, thereby allowing the first through hole 86 to be positioned away from the exposed portion 97. This allows the conductive member 90 to be held by the holding member 80 using a simple snap-fit ​​structure that provides the extension portion 85c and the claw portion 85d, while the exposed portion 97 can be suitably exposed within the substrate accommodating portion 65. Furthermore, by radially shifting the first portion 91 and the second portion 92, the third portion 93 connecting the first portion 91 and the second portion 92 can be positioned so as to overlap the first through hole 86 in the axial direction. This allows a portion of the mold M1, i.e., the protruding mold portion M1f, to be inserted from above into the first through hole 86 to hold the third portion 93. Furthermore, by assembling the conductive member 90 to the stator 20 before the conductive member 90 is held by the holding member 80, the second through hole 92d, on which the claw portion 85d is hooked, can be used to push the conductive member 90 in the axial direction, as described above. Because the second through hole 92d is provided in the second portion 92 where the connecting portion 92b is provided, pushing the conductive member 90 downward through the second through hole 92d makes it easy 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 assembling the conductive member 90 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 assembled, allowing for fine adjustments if dimensional discrepancies occur, while also allowing for 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 required to provide a simple snap-fit ​​structure using the extensions 85c and the claws 85d, it is possible to prevent the conductive member 90 from shifting during insert molding of the first housing 60 and to prevent the conductive member 90 from tilting when assembling the conductive member 90 to the stator 20. As a result, this embodiment allows for accurate assembly of the pump 100 and favorably improves the productivity of the pump 100.

[0109] Furthermore, according to this embodiment, the upper end of the fixed shaft 30 is embedded and held in the axial wall portion 64a. The first housing 60 has a third recess 66a recessed upward from the lower surface of the first housing 60. The stator core 21 has a first exposed surface 21a facing downward and 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 in the mold M2, i.e., the lower side. This allows the fixed shaft 30 and the assembly 110 to be supported in the same mold M2. Therefore, for example, compared to when 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. This further reduces the number of steps and time required to manufacture the first housing 60 by insert molding. This makes it easier to manufacture the first housing 60, thereby improving the productivity of the pump 100. Furthermore, compared to when the assembly 110 is held in the mold M1 located above, by supporting the stator core 21 from below with the support pins P, the assembly 110 can be easily placed in the mold M2, thereby preventing the shapes of the molds M1, M2 from becoming complicated. Furthermore, because the first housing 60 can be molded with the fixed shaft 30 and the assembly 110 supported by the same mold M2, the relative positional accuracy between the fixed shaft 30 and the assembly 110 can be improved compared to when the fixed shaft 30 and the assembly 110 are supported in separate molds.

[0110] For example, even if the assembly 110 shown in FIG. 17 is inverted vertically (axially) and supported from below by a mold located vertically below, productivity of the pump 100 can be improved in the same manner as described above by providing a recess similar to the first mold recess M1d in the mold located vertically below. However, in this case, if the fixed shaft 30 needs to be an insert member as in the present embodiment, the fixed shaft 30 needs to be supported in a mold located vertically above. This necessitates providing a structure for supporting the fixed shaft 30 in the mold located vertically above, which tends to complicate the mold. This may make it difficult to improve productivity of the pump 100. In contrast, in the present embodiment, the assembly 110 is supported by a mold M2 located vertically below with the holding member 80 positioned vertically above the stator 20. This allows both the assembly 110 and the fixed shaft 30 to be supported from below by the same mold M2 and easily installed in the mold M2. Therefore, the first housing 60 can be insert-molded using the assembly 110 and the fixed shaft 30 as insert members while preventing the mold M2 from becoming complicated, thereby favorably improving the productivity of the pump 100.

[0111] Furthermore, according to this embodiment, the stator core 21 has the 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 the circumferential direction 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 in the circumferential direction. This improves the positional accuracy of the stator 20 relative to the first housing 60 in the circumferential direction.

[0113] Furthermore, according to this embodiment, the stator core 21 has a protrusion 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 protrusion 26. Therefore, the portion of the stator 20 that is supported by the support pin P when the first housing 60 is insert-molded can be located radially outward from the core back 24. This allows the third recess 66a, formed by providing the support pin P, to be positioned radially outward from the core back 24. Therefore, it is easy to position the third recess 66a radially outward from the flow path 76 provided in the second housing 70. This prevents the lower opening of the third recess 66a from opening to the flow path 76. This prevents water flowing through the flow path 76 from flowing into the third recess 66a. Furthermore, when the stator 20 is embedded and held in the first housing 60 made of resin, there is no need to fix the core back 24 to the housing 50 by shrink fitting, press fitting, or the like, and therefore the radial thickness of the core back 24 can be easily reduced. When the radial thickness of the core back 24 is reduced, if a groove or the like is provided in the core back 24 and the core back 24 is supported by the support pin portions P, the flow of magnetic flux in the core back 24 is easily obstructed. In contrast, in the present embodiment, a protrusion 26 that protrudes radially outward from the core back 24 is provided and supported by the support pin portions P, so there is no need to provide a groove or the like in the core back 24 for supporting the core back 24 by the support pin portions P. This makes it possible to prevent the flow of magnetic flux in the core back 24 from being obstructed.

[0114] The protrusion 26 also has a core recess 26a recessed radially inward from the radially outer surface of the protrusion 26. The first exposed surface 21a is provided on the lower end surface of the protrusion 26. The second exposed surface 21b is provided on a radially inner portion of the inner surface of the core recess 26a. Therefore, as described above, the second pin portion P2 of the support pin portion P is fitted into the core recess 26a, and the first pin portion P1 supports the protrusion 26 from below, allowing the stator 20 to be supported by the mold M2. This allows the first housing 60 to be molded while the stator 20 is positioned axially and radially by the mold M2. Furthermore, since the second pin portion P2 is located within the core recess 26a, circumferential movement of the stator 20 supported by the mold M2 can be suppressed.

[0115] Furthermore, according to this embodiment, a plurality of protrusions 26 are provided at intervals in the circumferential direction. Therefore, the stator core 21 can be stably supported in the mold M2 by the plurality of support pins P. This makes it possible to suitably prevent the stator core 21 from moving due to the resin poured into the cavity C when the first housing 60 is insert-molded.

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

[0117] Furthermore, according to this embodiment, the second housing 70 closes the lower opening of the third recess 66a. This effectively prevents water from entering the third recess 66a. Furthermore, because 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 for closing the lower opening of the third recess 66a. This reduces the number of parts in the pump 100, further improving the productivity of the pump 100.

[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. This allows the second housing 70 to more effectively close the lower opening of the third recess 66a. This more effectively prevents 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 portion of the stator core 21 is embedded and held, and a small-diameter housing portion 62 that is connected to the upper side of the large-diameter housing portion 61 and has an outer diameter smaller than that of the large-diameter housing portion 61. A step portion 63 having an upward-facing step surface 63a is provided on the radially outer surface of the first housing 60 between the large-diameter housing portion 61 and the small-diameter housing portion 62 in the axial direction. 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 step surface 63a of the step portion 63, thereby stably welding the first housing 60 and the second housing 70 together. This allows the first welded fixing portion 67 and the second welded fixing portion 77 to be welded together in a suitable manner, and allows the second welded fixing portion 77 to more suitably close the lower opening of the third recess 66a.

[0120] As described above, in this embodiment, by providing the protrusion 26 on the stator core 21, the portion of the stator 20 supported by the mold M2 when molding the first housing 60 is positioned radially outward of the flow passage portion 76, and the third recess 66a is positioned so as not to overlap with the flow passage portion 76 in the axial direction. The second housing 70 is then welded to the first housing 60 to close the lower opening of the third recess 66a. Therefore, even if the third recess 66a is opened on the side of the stator 20 where the flow passage portion 76 is located, i.e., on the lower side, it is possible to prevent water from entering the third recess 66a, and a separate process for closing the third recess 66a is not required. This effectively prevents water from entering the third recess 66a, and improves the productivity of the pump 100.

[0121] The present invention is not limited to the above-described embodiments, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The conductive member may be any member that is conductive and can be held by the holding member. The conductive member may be a member that is not connected to the substrate in the substrate accommodating portion. The number of conductive members is not particularly limited as long as it is one or more. The conductive member may have any shape as long as it has an exposed portion. When the conductive member and the holding member are molded separately and assembled, the conductive member may be held by the holding member by a method other than a snap-fit ​​structure. When claw portions are provided on the holding member, the first direction in which the claw portions protrude may be any direction as long as it is perpendicular to the axial direction. The claw portions may be hooked on the conductive member in any manner.

[0122] The retaining member may have any configuration as long as it is positioned on the other axial side (upper side) of the stator, retains 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 board accommodating portion. The retaining member may be made by insert molding using the conductive member as an insert member. In this case, the conductive member can be held by the retaining member while molding the retaining member. In this case, for example, the retaining member holding the conductive member is brought close to the stator from the other axial side (upper side) and supported by the stator from one axial side (lower side), thereby assembling an assembly that serves as an insert member when insert molding the resin housing (first housing).

[0123] If the surface of the first protrusion on the holding member facing the other axial side (upper side) is exposed inside the substrate accommodating section, the portion of the surface of the base of the holding member facing the other axial side (upper side) that surrounds the first protrusion does not have to be exposed inside the substrate accommodating section. The first protrusion does not have to be provided. When the holding member has a second protrusion, the second recess does not have to be provided. The second protrusion does not have to be provided.

[0124] The substrate accommodated in the substrate accommodating section may be a substrate used for any purpose. The substrate may not have an inverter circuit that supplies power to the stator coil. The substrate may be a substrate to which a rotation sensor that can detect the rotation of the rotor is connected. The rotor may not have a fixed shaft, but may have a shaft that rotates around its central axis.

[0125] The use of the pump to which the present invention is applied is not particularly limited. The pump may be mounted on any type of equipment. For example, the pump may be mounted on a vehicle. The pump may be a pump that pumps any type of fluid. The pump may be an oil pump that pumps oil.

[0126] The present technology can be configured as follows: (1) A pump including a rotor rotatable about a central axis, a stator radially facing the rotor with a gap therebetween, 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 accommodating section that accommodates the rotor therein, and a substrate accommodated inside the resin housing, wherein the resin housing has a substrate accommodating section that is located on the other axial side of the rotor accommodating section and accommodates the substrate therein, at least a part of the stator and at least a part of the retaining member are embedded and held in the resin housing, the conductive member has an exposed part that protrudes from the retaining member to the other axial side and is exposed inside the substrate accommodating section, and a part of a surface of the retaining member facing the other axial side that surrounds the exposed part is exposed inside the substrate accommodating section. (2) The pump described in (1), wherein the holding member has a base and a first protrusion protruding from the base to the other axial side, the exposed portion protruding from the first protrusion to the other axial side, and the first protrusion being exposed inside the substrate accommodating portion. (3) The pump described in (2), wherein a portion of the surface of the base facing the other axial side that surrounds the first protrusion is exposed inside the substrate accommodating portion. (4) The pump described in (3), wherein the conductive member and the first protrusion are provided in a plurality of positions spaced apart in the circumferential direction, the exposed portions of the plurality of conductive members protrude to the other axial side from each of the plurality of first protrusions, the base is annular and surrounds the central axis, and the surface of the base facing the other axial side has an exposed surface that surrounds the central axis and is exposed inside the substrate accommodating portion, the exposed surface including a portion surrounding each of the plurality of first protrusions. (5) The pump according to (4), further comprising an electronic component attached to the circuit board, the resin housing having a first recess recessed to one side in the axial direction, the first recess being located radially inward from the base, and at least a portion of the electronic component being accommodated inside the first recess. (6) The pump according to any one of (1) to (5), further comprising: the conductive member held by the holding member by a snap-fit ​​structure.(7) The pump according to (6), wherein the holding member has a first through hole penetrating the holding member in the axial direction, an extension portion extending from an edge of the first through hole to one side in the axial direction, and a claw portion protruding from the extension portion in a first direction perpendicular to the axial direction and overlapping with the first through hole as seen in the axial direction, the claw portion being 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, a position of the second portion in the first direction differs from a 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 an inner edge of the second through hole. (9) The pump according to (8), wherein the first conductive member has a third portion protruding from the first portion in the first direction and connected to the second portion, the first through hole being exposed inside the board accommodating portion, the resin housing has a hole portion connected to one axial side of the first through hole, and at least a part of a surface of the third portion facing the other axial side in the axial direction and at least a part of a surface of the third portion facing a second direction orthogonal to both the axial direction and the first direction in the axial direction are exposed inside the hole portion. (10) The pump according to any one of (1) to (9), wherein the holding member has a third through hole penetrating the holding member in the axial direction, the resin housing has a protruding support portion protruding through the third through hole to the other axial side beyond the holding member, the protruding support portion being exposed inside the board accommodating portion and supporting the board. (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 contacts a surface of the holding member on the other axial side. (12) The pump according to any one of (1) to (11), wherein the resin housing has a pressing portion that contacts a surface of the holding member on the other axial side at a radial outer edge portion. (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 protruding from one axial side, and the second protrusion is embedded in the resin housing. (15) The pump according to (14), wherein the retaining member has a second recess recessed from one axial side, and the second recess is provided at a position overlapping with the second protrusion as viewed in the axial direction.

[0127] The configurations and methods described in this specification can be combined as appropriate within the scope of not being mutually contradictory.

[0128] DESCRIPTION OF SYMBOLS 10...rotor, 20...stator, 21...stator core, 23...coil, 40...pump portion, 50...housing, 60...first housing (resin housing), 64...rotor accommodating portion, 64e...hole portion, 65...substrate accommodating portion, 65a...pressing portion, 68...protruding support portion, 68a...small diameter portion, 68b...large diameter portion, 69...first recess, 80...holding member, 81...base portion, 81c...exposed surface, 83, 83a, 83b...first convex portion, 85c...extension portion , 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 pump comprising: a rotor rotatable about a central axis; a stator radially opposed to the rotor with a gap therebetween; 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 accommodating section that accommodates the rotor therein; and a board accommodated inside the resin housing, wherein the resin housing has a board accommodating section located on the other axial side of the rotor accommodating section and accommodating the board therein, at least a part of the stator and at least a part of the retaining member are embedded and held in the resin housing, the conductive member has an exposed part that protrudes from the retaining member to the other axial side and is exposed inside the board accommodating section, and a part of the surface of the retaining member facing the other axial side that surrounds the exposed part is exposed inside the board accommodating section.

2. A pump as described in claim 1, wherein the retaining member has a base and a first convex portion protruding from the base to the other axial direction, the exposed portion protruding from the first convex portion to the other axial direction, and the first convex portion being exposed inside the substrate accommodating portion.

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

4. A pump as described in claim 3, wherein the conductive members and the first convex portions are provided in a plurality of positions spaced apart in the circumferential direction, the exposed portions of the plurality of conductive members protrude from each of the plurality of first convex portions to the other axial direction side, the base portion is annular and surrounds the central axis, and a surface of the base portion facing the other axial direction side has an exposed surface that surrounds the central axis and is exposed to the inside of the substrate accommodating portion, and the exposed surface includes a portion that surrounds each of the plurality of first convex portions.

5. A pump as described in claim 4, further comprising an electronic component attached to the board, wherein the resin housing has a first recess recessed to one side in the axial direction, the first recess being located radially inward from the base, and at least a portion of the electronic component being accommodated inside the first recess.

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

7. The pump described in claim 6, wherein the retaining member has a first through hole passing through the retaining member in the axial direction, an extension portion extending from an edge of the first through hole to one side in the axial direction, and a claw portion protruding from the extension portion in a first direction perpendicular to the axial direction and overlapping with the first through hole when viewed in the axial direction, and the claw portion is hooked onto the conductive member.

8. The pump described in claim 7, wherein the stator has a coil, the conductive member includes a first conductive member electrically connected to the coil, the first conductive member has 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 is different from the position of the first portion in the first direction, the second portion has a second through hole penetrating the second portion in the first direction, and the claw portion is hooked onto an inner edge of the second through hole.

9. The pump described in claim 8, wherein the first conductive member has a third portion protruding from the first portion in the first direction and connected to the second portion, the first through hole is exposed inside the board accommodating portion, the resin housing has a hole portion connected to one axial side of the first through hole, and at least a portion of a surface of the third portion facing the other axial side and at least a portion of a surface of the third portion facing a second direction perpendicular to both the axial direction and the first direction are exposed inside the hole portion.

10. A pump as described in any one of claims 1 to 5, 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 through the third through hole to the other axial side of the retaining member, and the protruding support portion is exposed inside the substrate accommodating portion and supports the substrate.

11. A pump as described in claim 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, the large diameter portion contacting the other axial side surface of the retaining member.

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

13. A pump as claimed in any one of claims 1 to 5, wherein the stator has a stator core, and the conductive member includes a second conductive member in contact with the stator core.

14. A pump as claimed in any one of claims 1 to 5, wherein the retaining member has a second protrusion protruding to one side in the axial direction, and the second protrusion is embedded in the resin housing.

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

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