CN218335449U

CN218335449U - Pump and method of operating the same

Info

Publication number: CN218335449U
Application number: CN202221767802.1U
Authority: CN
Inventors: 雫修通; 片冈慈裕; 八幡考恒; T·雷提坦; N·T·T·谭
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Powertrain Systems Corp
Priority date: 2021-07-12
Filing date: 2022-07-08
Publication date: 2023-01-17
Anticipated expiration: 2032-07-08
Also published as: JP2023011431A

Abstract

The utility model discloses a mode of pump includes: a rotor rotatable about a central axis; a stator assembly located radially outside the rotor and surrounding the rotor; a pump section connected to one axial side of the rotor; the circuit substrate is configured at the other axial side of the stator assembly; a support member having a rotor housing portion located radially inside the stator assembly and housing the rotor therein; and a resin housing molding the stator assembly and the support member. The rotor housing section includes: a cover portion covering the rotor from the other axial side; and a cylindrical portion located radially between the rotor and the stator assembly and opened to one axial side. The stator assembly has: an annular stator core; a plurality of coils mounted to the stator core; and a stator cover covering the plurality of coils. The stator cover has a coil holding portion that holds a coil wire extending from the coil and connected to the circuit board.

Description

Pump

Technical Field

The utility model relates to a pump.

Background

Development of an electric pump in which a motor section, a pump section, and a drive section are integrated in advance is advanced. The reference 1 discloses a structure in which a motor portion and a pump portion are integrally formed as a pump, and the stator is molded to ensure waterproofness of the stator.

Documents of the prior art

Patent literature

Patent document 1: japanese patent No. 5316911

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

As shown in the prior art document, the molding resin is in direct contact with the coils when the stator is molded. Therefore, the coil wire may be damaged by heat and injection pressure at the time of molding of the molding resin.

In view of the above, it is an object of the present invention to provide a pump that improves the reliability of a stator.

Technical scheme for solving technical problem

The utility model discloses a mode of pump includes: a rotor rotatable about a central axis; a stator assembly located radially outward of the rotor and surrounding the rotor; a pump portion connected to one axial side of the rotor; the circuit substrate is arranged on the other axial side of the stator assembly; a support member having a rotor housing portion located radially inward of the stator assembly and housing the rotor therein; and a resin housing that molds the stator assembly and the support member. The rotor housing section includes: a cover portion that covers the rotor from the other axial side; and a cylindrical portion located radially between the rotor and the stator assembly and opened to one axial side. The stator assembly has: an annular stator core; a plurality of coils mounted to the stator core; and a stator cover covering the plurality of coils. The stator cover includes a coil holding portion that holds a coil wire extending from the coil and connected to the circuit board.

Effect of the utility model

According to the utility model discloses a mode can provide the pump that has improved the reliability of stator.

Drawings

Fig. 1 is a perspective view of a pump according to an embodiment.

FIG. 2 is a cross-sectional view of an embodiment of a pump.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a partially enlarged view of fig. 2.

Fig. 5 is a partially enlarged view of fig. 2.

Fig. 6 is a partially enlarged view of fig. 2.

Fig. 7 is a perspective view of a stator assembly of an embodiment.

Fig. 8 is a partial sectional view of a pump according to a modification.

(description of symbols)

1, pumping; 3a motor; 7 an external device; 8 terminal terminals; 8a first end portion; 8b a second end; 9. 109 a thermally conductive material; 10 a support member; 10f a third contact surface; 11 a flange part; 11d positioning ribs; 11e convex parts; 12a rotor housing section; 12a cover part; 12b a cylindrical part; 12c a holding part; 20a pump housing; 20a main area; 20b sub-region; 20f a first contact surface; 30 resin case (motor case); 30a outer peripheral surface; 30e a fourth contact surface; 30f a second contact surface; 31 a retainer cylinder portion; 31e a recess; 32a step surface; 32b opposite faces; 39 a connector portion; 40 fixing the shaft; 41 a shaft main body portion; 42a holding member; 42a exposed part; 42f holding member flange portions (flange portions); 50 rotors; 60 pump part; 64 suction inlet; 65 an exhaust port; 70 a stator; 71a stator core; 72 an insulator; 73 coils; 73a coil wire; 75 a stator assembly; 80 a circuit board; 81a substrate main body; 81h first through hole (via); 82 a heat generating element; 90 a stator cover; 91 a first cover (cage); 92 second enclosure (housing); a 94aa jaw portion; 94f a closure wall portion; 96 an inner cylindrical portion; 97 columnar portion; 97a upper end face (front end face); 97h through hole (coil holding part); 97t taper; 98a terminal holding portion; g gap; j center axis

Detailed Description

In the drawings, the center axis J of the pump 1 according to the embodiment described below is shown in a phantom view. In the following description, the axial direction of the center axis J is simply referred to as "axial direction". The radial direction centered on the center axis J is simply referred to as "radial direction". The circumferential direction centered on the central axis J is simply referred to as "circumferential direction".

In the present embodiment, the lower side corresponds to the "one axial side", and the upper side corresponds to the "other axial side". The upper side and the lower side are only names for explaining the relative positional relationship of the respective portions, and the actual arrangement relationship and the like may be an arrangement relationship other than the arrangement relationship and the like indicated by these names.

Fig. 1 is a perspective view of the pump 1. Fig. 2 is a sectional view of the pump 1. Fig. 3, 4, 5 and 6 are partially enlarged views of fig. 2. In fig. 2, for convenience of explanation, cross sections at different circumferential positions are shown on the left and right sides across the center axis J.

As shown in fig. 2, the pump 1 of the present embodiment includes a motor 3, a pump section 60, a support member 10, a fixed shaft 40, a circuit board 80, and a casing 2. The motor 3 includes a rotor 50 rotatable about the central axis J, and a stator assembly 75 located radially outward of the rotor 50 and surrounding the rotor 50. That is, the pump 1 includes a rotor 50 and a stator assembly 75.

The pump 1 of the present embodiment is a water pump that transports water. The pump 1 rotates the pump section 60 by the motor 3, and thereby discharges the water (liquid) sucked from the inflow pipe 26 from the outflow pipe 27 (see fig. 1).

As shown in fig. 2, the casing 2 houses the motor 3, the pump section 60, the support member 10, the fixed shaft 40, and the circuit board 80. The interior of the housing 2 defines a flow path region A2 through which water (liquid) passes and a waterproof region A1 closed to water. In the channel region A2, the rotor 50, the fixed shaft 40, and the pump section 60 are disposed. In the waterproof area A1, the stator assembly 75 and the circuit board 80 are disposed. The flow path region A2 and the water-repellent region A1 are divided by the support member 10.

The housing 2 includes a resin case (motor case) 30, a substrate cover 28, and a pump cover 20. That is, the casing 1 includes a resin case 30, a substrate cover 28, and a pump cover 20. The substrate cover 28 is joined to the upper end portion of the resin case 30. On the other hand, the pump cover 20 is joined to the lower end portion of the resin case 30. Thereby, the resin case 30, the substrate cover 28, and the pump cover 20 are fixed to each other.

The resin case 30 has an embedded portion 32 in which the stator assembly 75 and the support member 10 are molded and embedded. That is, the resin case 30 is formed by insert molding in which the stator assembly 75 and the support member 10 are fitted. Thereby, the resin case 30 holds the stator assembly 75 and the support member 10. The resin case 30 surrounds the stator 70, the rotor 50, and the rotor housing 12 from the outside in the radial direction.

As shown in fig. 1, the outer peripheral surface 30a of the resin case 30 is circular when viewed in the axial direction. The outer peripheral surface 30a of the resin case 30 is provided with a connector portion 39. That is, the resin case 30 has a connector portion 39. The connector portion 39 protects the terminal terminals 8 connected to the external device 7.

As shown in fig. 2, a housing upper surface 30g facing upward and a surrounding tube portion 38 extending upward from an outer edge of the upper surface 30g are provided at an upper end portion of the resin housing 30. On the other hand, a cylindrical retainer cylinder portion 31 centered on the central axis J is provided at the lower end of the resin case 30. The resin case 30 is joined to the substrate cover 28 at the surrounding cylindrical portion 38, and is joined to the pump cover 20 at the holding cylindrical portion 31.

The housing upper surface 30g faces the circuit board 80 in the vertical direction. The housing upper surface 30g is provided with a boss for supporting the circuit board 80 from below. The surrounding cylinder portion 38 is cylindrical with the center axis J as the center. The surrounding cylindrical portion 38 surrounds the circuit board 80 from the radial outside.

The substrate cover 28 includes a plate-shaped cover body portion 28a extending along a plane orthogonal to the central axis J, and a guide rib 28b provided on a lower surface of the cover body portion 28 a. The cover body portion 28a is circular about the center axis J. The outer diameter of the cover body 28a substantially matches the outer diameter of the resin case 30. The guide rib 28b extends in the circumferential direction. The guide rib 28b is disposed radially inward of the outer edge of the cover main body portion 28 a. The outer peripheral surface of the guide rib 28b is fitted to the inner peripheral surface of the resin case 30 surrounding the tube portion 38. Thereby, the substrate cover 28 is positioned with respect to the resin case 30.

A region located radially outward of the guide ribs 28b in the lower surface of the cap main body portion 28a is in contact with the upper end surface of the surrounding cylindrical portion 38 of the resin housing 30. The lower surface of the cover body portion 28a and the upper end surface of the surrounding tube portion 38 are welded to each other.

In the soldering step, the substrate cover 28 is rotated while pressing the lower surface against the resin case 30. In the welding step, the contact portion between the substrate cover 28 and the resin case 30 is melted and solidified by frictional heat to join them. That is, the substrate cover 28 and the resin case 30 are joined by spin welding. The substrate cover 28 and the resin case 30 may be welded by other welding methods such as ultrasonic welding and laser welding.

The circuit board 80 is disposed above (axially on the other side) the stator assembly 75. That is, the circuit board 80 is disposed above the stator 70. The circuit board 80 is housed in a space surrounded by the radially inner side of the surrounding tube portion 38 of the resin case 30, the case upper surface 30g, and the board cover 28.

The circuit board 80 includes: a plate-shaped substrate main body 81 along a plane orthogonal to the central axis J; and a heat generating element 82 attached to an upper surface 81a (the other surface in the axial direction) of the substrate main body 81. In addition to the heat generating element 82, the circuit board 80 includes a plurality of elements (not shown) mounted on the upper surface 81a or the lower surface 81b of the board main body 81.

The substrate main body 81 has a first through hole (through hole) 81h and a second through hole 81k penetrating in the thickness direction. That is, the circuit board 80 is provided with a first through hole 81h and a second through hole 81k. The coil wire 73a extending upward from the stator assembly 75 is inserted into the first through hole 81h and soldered to the board main body 81. The first end 8a of the terminal 8 is inserted into the second through hole 81k and soldered to the substrate body 81. The first through hole 81h and the second through hole 81k are provided in plurality on the substrate main body 81.

The heater element 82 is disposed on the central axis J. The heat generating element 82 is an element that emits heat during operation and becomes a high temperature, among elements mounted on the board main body 81. When the circuit board 80 includes a plurality of elements, the heat generating element 82 generates a larger amount of heat than other elements. Examples of the heat generating element 82 include a switching element, a capacitor, a field effect transistor driving integrated circuit, a power supply integrated circuit, and the like.

The support member (shield member) 10 is made of a nonmagnetic material. In the present embodiment, the support member 10 is made of resin. The support member 10 has a rotor housing portion 12 and a flange portion 11.

The rotor housing 12 is located radially inward of the stator assembly 75. That is, the rotor housing portion 12 is located radially inward of the stator 70. The rotor housing 12 is cylindrical and opens downward around the center axis J. The rotor housing portion 12 houses the rotor 50 therein. The rotor housing portion 12 includes a lid portion 12a covering the rotor 50 from above and a cylindrical portion 12b extending downward from the lid portion 12a.

The lid 12a has a circular plate shape centered on the central axis J. The cover 12a covers the rotor 50 from the upper side (the other side in the axial direction). The center of the lid 12a is provided with a holding portion 12c when viewed in the axial direction. The holding portion 12c holds an upper end of the fixed shaft 40. The holding portion 12c protrudes to the lower side than the other portion of the cover portion 12a.

The cylindrical portion 12b extends downward from the radially outer peripheral edge of the cover portion 12a, and is connected to the radially inner peripheral edge of the flange portion 11. The cylindrical portion 12b is located radially between the rotor 50 and the stator assembly 75. That is, the cylindrical portion 12b is located between the rotor 50 and the stator 70 in the radial direction. The cylindrical portion 12b is open downward.

According to the present embodiment, the rotor housing 12 houses the rotor 50 therein. The rotor housing 12 includes a cover 12a covering the rotor 50 from above and a cylindrical portion 12b surrounding the periphery of the rotor 50 and opening downward. Thus, the rotor housing section 12 can seal the rotor 50 and the stator 70 with a space therebetween while securing a structure for connecting the pump section 60 to the lower side of the rotor 50, and can suppress the liquid (water) fed by the pump section 60 from coming into contact with the stator 70.

The flange portion 11 has an annular shape surrounding the center axis J. The flange portion 11 extends radially outward from the lower (one axial) end of the rotor housing portion 12. The flange portion 11 is located at the lower side of the stator 70. A surface facing downward of the flange portion 11 (a third contact surface 10f described later) is welded to the pump cover 20.

The outer peripheral surface of the flange portion 11 is covered with a retainer cylinder portion 31 of the resin case 30. That is, the retainer cylinder portion 31 contacts the outer peripheral surface of the flange portion 11 at least at a part of the inner peripheral surface. In the present embodiment, the support member 10 is embedded in the resin case 30 together with the stator assembly 75.

The flange portion 11 is embedded in the resin case 30 at a part of the upper surface and the outer peripheral surface, and is exposed from the resin case 30 at the lower surface. The resin case 30 has a stepped surface 32a at a portion where the upper surface of the flange portion 11 is buried. That is, the resin case 30 has a stepped surface 32a that contacts the upper surface (surface facing the other axial side) of the flange portion 11. The resin case 30 axially supports the flange portion 11 at the stepped surface 32a.

As shown in fig. 1, a plurality of protrusions 11e arranged in the circumferential direction are provided on the outer peripheral surface of the flange portion 11. The inner peripheral surface of the retainer tube portion 31 is provided with a plurality of recesses 31e into which the protrusions 11e are inserted. When the resin case 30 is molded, the concave portion 31e is formed by surrounding the outer peripheral surface of the flange portion with molten resin and filling the convex portions 11e with each other. Therefore, the convex portion 11e and the concave portion 31e are in close contact with each other.

A positioning rib 11d is provided on the lower surface (surface facing one axial direction side) of the flange portion 11. The positioning rib 11d protrudes downward from the lower surface of the flange portion 11. The positioning rib 11d extends in the circumferential direction around the center axis J. The outer circumferential surface of the positioning rib 11d facing radially outward is fitted in the inner circumferential surface of the pump cover 20. The positioning rib 11d axially aligns the pump housing 20 opposite to the support member 10. Further, a slight gap may be provided between the outer peripheral surface of the positioning rib 11d and the inner peripheral surface of the pump cover 20. In this case, the pump cover 20 and the support member 10 are subjected to shaft alignment while allowing an assembly error within the range of the clearance.

As shown in fig. 2, the fixed shaft 40 extends in the axial direction. The fixed shaft 40 has: a cylindrical shaft body 41 extending in the axial direction about the center axis J; and a holding member 42 disposed on the other axial side of the shaft body 41. The shaft main body portion 41 and the holding member 42 are made of a metal material having excellent thermal conductivity.

The shaft body 41 has a screw hole 41h in its lower end surface. The threaded hole 41h extends in the axial direction around the center axis J. The retaining screw 69 is inserted into the screw hole 41h. The disengagement preventing screw 69 prevents the pump section 60 from disengaging downward.

A retaining recess 61 is provided in the center of the pump section 60. The retaining concave portion 61 is open downward. The retaining recess 61 has a downward retaining surface 61p as a bottom surface. The retaining screw 69 is disposed inside the retaining recess 61. The seat surface of the head of the retaining screw 69 is axially opposed to the retaining surface 61p of the retaining recess 61 of the pump section 60 via the washer 68.

The lower end surface of the shaft body 41, the retaining screw 69, and the washer 68 are exposed to the channel of the fluid pumped by the pump 60. Therefore, the fixed shaft 40, the retaining screw 69, and the washer 68 are in contact with the water (liquid) flowing into the pump section 60, and water-cooled. Therefore, heat transferred from the circuit board 80 to the fixed shaft 40 can be released into water, and the circuit board 80 can be efficiently cooled.

As shown in fig. 5, the holding member 42 is disposed on the upper side (the other side in the axial direction) of the shaft body portion 41. The holding member 42 has: the holding member main body 42b; and a holding member flange portion (flange portion) 42f extending radially outward from the holding member main body 42 b. The holding member main body 42b is provided with a holding hole 42h that opens downward. The upper end of the shaft body 41 is fitted into the holding hole 42h. Thereby, the shaft body portion 41 is fixed to the holding member 42.

According to the present embodiment, the fixed shaft 40 has a shaft body portion 41 and a holding member 42 fixed to each other. Therefore, the fixed shaft 40 can be manufactured by assembling the separately manufactured shaft body 41 and the holding member 42, and the fixed shaft 40 can be manufactured at low cost.

The holding member 42 is embedded in the cover portion 12a of the support member 10 by insert molding. More specifically, the holding member flange portion 42f of the holding member 42 is embedded in the holding portion 12c of the cover portion 12a. Thereby, the fixed shaft 40 is supported by the cover 12a. According to the present embodiment, the holding member flange portion 42f is embedded in the holding portion 12c, and the holding member flange portion 42f is hooked to the holding portion 12c with a large area in the axial direction. This can prevent the holding member flange 42f from coming off the holding portion 12c downward.

The holding member flange portion 42f extends radially outward with respect to the shaft main body portion 41. The holding member flange portion 42f is surface-treated to improve adhesion to the resin material constituting the holding portion 12c. This can suppress the entry of moisture into the interface between the holding member 42 and the holding portion 12c. Therefore, the moisture does not reach the upper side of the lid 12a from the inside of the rotor housing 12.

The holding member 42 has an exposed portion 42a exposed upward (axially on the other side) with respect to the cover portion 12a. That is, the fixed shaft 40 has an exposed portion 42a. The exposed portion 42a is an upper surface of the holding member main body 42b, and extends along a plane orthogonal to the central axis J. The exposed portion 42a extends along a plane orthogonal to the central axis J. The exposed portion 42a faces the circuit board 80 located above the cover 12a.

The heat conductive material 9 is interposed between the exposed portion 42a and the circuit board 80. The heat conductive material 9 of the present embodiment is a sheet-like heat sink. The heat conductive material 9 is made of silicon resin or the like. The heat conductive material 9 may be heat dissipating grease or heat dissipating gel.

The heat conductive material 9 is in contact with the exposed portion 42a. Further, the heat conductive material 9 is in contact with the lower surface 81b of the substrate main body 81 of the circuit substrate 80. The heat conductive material 9 moves the heat of the circuit substrate 80 toward the fixed shaft 40.

According to the present embodiment, the heat conductive material 9 transmits the heat generated in the circuit board 80 to the fixing shaft 40 through the heat conductive material 9. The heat capacity of the fixed shaft 40 is sufficiently large compared to the heat generating element 82 and the substrate body 81. The fixed shaft 40 is cooled by contacting with water (liquid) discharged from the pump section 60. Therefore, according to the present embodiment, the circuit board 80 can be efficiently cooled, and the reliability of the operation of the circuit board 80 can be improved.

According to the present embodiment, the circuit board 80 is cooled using the fixed shaft 40 provided inside the pump 1. Therefore, the pump 1 main body can be downsized in the axial direction, compared to the case where a heat sink is also used on the upper side of the circuit board 80. Further, compared to the case of using a heat sink, a sealing structure around the heat sink can be omitted, and the manufacturing cost can be reduced.

In the present embodiment, the heating element 82, the heat conductive material 9, and the exposed portion 42a overlap each other when viewed in the axial direction. Therefore, the heat generated in the heating element 82 can be transmitted to the exposed portion 42a of the fixed shaft 40 at the shortest distance via the substrate body 81 and the heat conductive material 9, and the heating element 82 can be efficiently cooled by the fixed shaft 40.

In the present embodiment, a case where the heating element 82 is mounted on the upper surface 81a of the substrate main body 81 is described. In this case, the heat of the heat generating element 82 is transferred to the heat conductive material 9 via the circuit substrate. In contrast, as shown as a modification in fig. 8, the heater element 82 may be attached to the lower surface 81b (one surface in the axial direction) of the substrate body 81. In this modification, the heat conductive material 109 is in direct contact with the heat generating element. Therefore, the heat of the heating element can be directly transferred to the heat conductive material 109, and the cooling efficiency of the heating element 82 can be improved.

As shown in fig. 2, the rotor 50 is housed inside the rotor housing portion 12. The rotor 50 is rotatable about the center axis J. The rotor 50 has a rotor core 51, a magnet 52, a first cover 54, and a resin portion 53.

The rotor core 51 has a ring shape surrounding the center axis J. The fixed shaft 40 passes through the radially inner side of the rotor core 51 in the axial direction. The magnet 52 is fixed to the rotor core 51. In the present embodiment, the magnet 52 is disposed on the outer peripheral surface of the rotor core 51. The magnet 52 is provided in plurality at intervals in the circumferential direction, for example. The first covering portion 54 fixes the rotor core 51 and the plurality of magnets 52 to each other. The first cover portion 54, the rotor core 51, and the magnet 52 constitute a rotor assembly 55.

The resin portion 53 surrounds the central axis J and is cylindrical extending in the axial direction. The fixed shaft 40 passes through the radially inner side of the resin portion 53 in the axial direction. The fixed shaft 40 is inserted radially inward of the resin portion 53. The fixed shaft 40 rotatably supports the rotor 50 by supporting the inner peripheral surface of the resin portion 53.

The resin portion 53 has: a second covering part 53a in which the rotor assembly 55 is embedded and held; and an extension portion 53b extending downward from the second covering portion 53 a. The second covering portion 53a has a portion located between the fixed shaft 40 and the rotor core 51 in the radial direction. The lower end of the extension 53b protrudes below the rotor housing 12. A retaining recess 61 is provided at the lower end of the extension 53b. As described above, the retaining screw 69 for suppressing the detachment of the rotor 50 from the pump section 60 is disposed inside the retaining recess 61.

The outer peripheral surface of the resin portion 53 is the outer peripheral surface of the rotor 50. The outer peripheral surface of the resin portion 53 is located at a position radially inward from the inner peripheral surface of the rotor housing portion 12. The outer peripheral surface of the second covering portion 53a faces the inner peripheral surface of the rotor housing portion 12 with a slight gap therebetween.

The pump section 60 is connected to the lower side (one axial side) of the rotor 50. In the present embodiment, the pump section 60 is an impeller. The pump section 60 is made of resin.

The pump section 60 has an impeller main body 62 connected to a lower end portion of the extension portion 53b of the rotor 50. The resin part 53 and the impeller main body part 62 are part of the same single component. The resin portion including the resin portion 53 and the impeller main body portion 62 is manufactured by, for example, insert molding in which the rotor assembly 55 is an insert member.

The impeller main body 62 includes a bottom plate 62a, a shroud 62b, a plurality of blade portions 62c, and a cylindrical portion 62d.

The bottom plate portion 62a and the cover plate portion 62b are circular when viewed in the axial direction. The bottom plate portion 62a extends radially outward from the outer peripheral surface of the extending portion 53b. The cover plate portion 62b extends radially outward along the plate surface of the bottom plate portion 62a below the bottom plate portion 62 a.

The cylindrical portion 62d extends in the axial direction around the central axis J. The cylindrical portion 62d surrounds the extending portion 53b from the radial outside. The interior of the cylindrical portion 62d is connected to a space between the bottom plate portion 62a and the cover plate portion 62 b. The blade portion 62c connects the bottom plate portion 62a and the hood plate portion 62 b. The blade portions 62c extend in the radial direction. By rotating the pump section 60, the plurality of vane sections 62c transport the liquid between the vane sections 62c to the radial outside.

The pump section 60 has: a suction port 64 through which water (liquid) is sucked; and a discharge port 65 for discharging water (liquid). The suction port 64 faces downward and is axially opposed to the inflow pipe 26. On the other hand, the discharge port 65 faces radially outward and is opposed to the outflow pipe 27 (see fig. 1) in the radial direction.

The suction port 64 is provided at the lower end of the cylindrical portion 62d. The suction port 64 is open to the lower side. On the other hand, the outlet 65 is provided between the bottom plate 62a and the cover plate 62b in the axial direction. The discharge port 65 opens radially outward. The pump section 60 is rotated around the center axis J by the rotor 50, whereby water is sucked into the interior from the suction port 64 and discharged from the discharge port 65 to be delivered. The water fed from the pump section 60 also flows into the rotor housing section 12.

As shown in fig. 3, the stator assembly 75 includes: an annular stator core 71; a plurality of coils 73 mounted on the stator core 71; a plurality of insulators 72 interposed between the stator core 71 and the plurality of coils 73; and a stator cover 90. In the stator 70, the stator core 71, the plurality of coils 73, and the plurality of insulators 72 constitute the stator 70. That is, the stator assembly 75 has a stator 70 and a stator can 90.

The stator 70 is located radially outward of the rotor 50 and surrounds the rotor 50. The stator 70 is annular and surrounds the rotor housing 12 and the rotor 50 radially outside the rotor housing 12. The stator 70 has: the stator core 71; an insulator 72 mounted to the stator core 71; and a plurality of coils 73 mounted to the stator core 71 via insulators 72.

The stator core 71 is positioned radially outward of the rotor housing 12 and surrounds the rotor core 51. The stator core 71 has: an annular core back 71a surrounding the rotor core 51; and a plurality of teeth 71b extending radially inward from the core back 71 a. Although not shown, the plurality of teeth 71b are arranged in a circumferential direction.

The radially inner end portions of the plurality of pole teeth 71b face the outer peripheral surface of the cylindrical portion 12b of the rotor housing 12 with a slight gap therebetween. That is, in the present embodiment, the stator 70 is disposed in a state of non-contact with the outer peripheral surface of the cylindrical portion 12b.

As shown in fig. 4, the coil 73 is formed by winding a coil wire 73a around the teeth 71b. The insulator 72 is interposed between the coil 73 and the teeth 71b. The end of the coil wire 73a extends upward from the coil 73. The extended coil wire 73a is connected to the circuit board 80. The number of coils 73 provided to the stator 70 is the same as the number of pole teeth 71b.

As shown in fig. 3, the insulator 72 is attached to the tooth 71b. The insulator 72 covers the outer peripheral surface of the tooth 71b. The insulator 72 of the present embodiment can be divided in the vertical direction. The insulator 72 is assembled to the teeth 71b from the vertical direction. The insulator 72 of the present embodiment is attached to each tooth 71b. The number of insulators 72 provided to the stator 70 is the same as the number of pole teeth 71b.

The insulator 72 has: an enclosing portion 72d disposed between the coil 73 and the teeth 71 b; an outer wall portion 72b located radially outward of the coil 73; and an inner wall portion 72c located radially inward of the coil 73. The surrounding portion 72d has a square tubular shape covering the outer peripheral surface of the tooth 71b. The outer wall portion 72b and the inner wall portion 72c sandwich the coil 73 from both sides in the radial direction.

Fig. 7 is a perspective view of the stator assembly 75 of the present embodiment.

As shown in fig. 3 and 7, a step portion 72a is provided on the outer surface of the outer wall portion 72b facing radially outward. Step portions 72a are provided on the upper and lower sides of the stator core 71, respectively. The step portion 72a is recessed radially inward with respect to the outer surface of the outer wall portion 72 b. The step portion 72a has a step surface facing the stator core 71.

As shown in fig. 3, one insulator 72 is provided with two step portions 72a. One of the two step portions 72a is located below the stator core 71, and the other is located above the stator core 71. As shown in fig. 7, the plurality of insulators 72 are arranged in the circumferential direction. Therefore, the plurality of step portions 72a are arranged at equal intervals in the circumferential direction on the upper side and the lower side of the stator core 71.

As shown in fig. 3, the stator cover 90 covers the plurality of coils 73. As described above, the coil 73 is disposed between the outer wall portion 72b and the inner wall portion 72c of the insulator 72. Further, the coil 73 is exposed to the upper and lower sides with respect to the insulator 72. The stator cover 90 is disposed so as to span between the outer wall portion 72b and the inner wall portion 72c of the insulator 72.

The stator cover 90 includes: an annular first cover 91 that covers the coil 73 from below (one axial side); and an annular second cover 92 that covers the coil 73 from the upper side (the other side in the axial direction).

According to the present embodiment, by covering the coil 73 with the stator cover 90, the coil 73 can be protected from the molten resin material when the resin case 30 is molded. Generally, an insulating coating is provided on the surface of the coil wire 73a. According to the present embodiment, it is possible to suppress the insulating coating of the coil wire 73a from being damaged by the heat and injection pressure of the molten resin at the time of molding the resin case 30.

In the present embodiment, a gap G is provided between the stator cover 90 and the coil 73. That is, according to the present embodiment, an air layer is provided between the resin case 30 and the coil 73, and the heat of the molten resin at the time of molding is not easily transmitted to the coil 73. This can reliably suppress damage to the insulating coating of the coil wire 73a.

In general, the coil 73 is formed by winding the coil wire 73a, and thus the outer shape is difficult to stabilize. According to the present embodiment, the stator cover 90 can be assembled to the stator 70 without depending on the shape of the coil 73 by providing the gap G between the stator cover 90 and the coil 73.

Since the coil wire 73a is exposed, the surface of the coil 73 has a complex uneven shape. Therefore, when the surface of the coil 73 is molded by the resin case 30, the molten resin is less likely to flow between the coil wires 73a, and sink marks and the like are likely to occur in the resin case 30. Further, since the surface of the coil 73 has a complicated uneven shape, there is a problem that it is difficult to control the thickness of the resin case 30 and to stabilize the dimensional accuracy.

According to the present embodiment, the resin case 30 covers the stator cover 90 without covering the surface of the coil 73. That is, the mold resin does not need to cover a complicated uneven shape, and sink marks of the resin case 30 can be suppressed, and dimensional accuracy can be stabilized.

According to the present embodiment, the molten resin material covers the surfaces of the stator cover 90 and the stator core 71 when the resin case 30 is molded. This allows the stator 70 to be externally closed. Further, the stator cover 90 is firmly fixed to the stator core 71, and the reliability of protection of the coil 73 by the stator cover 90 can be improved.

According to the present embodiment, the stator cover 90 includes a pair of

cover bodies

91, 92 that cover the coil 73 from the lower side and the upper side, respectively. Therefore, the stator cover 90 can be easily assembled to the stator 70. The stator cover 90 can effectively cover the exposed portion of the coil 73 in the vertical direction by the pair of

cover bodies

91 and 92.

As shown in fig. 7, the first cover 91 and the second cover 92 each have an annular body 93, an outer cylinder 95, an inner cylinder 96, a plurality of locking portions 94a, and a plurality of closing walls 94f. In addition, the second cover 92 has a plurality of columnar portions 97 and terminal holding portions 98. That is, the stator cover 90 includes an annular body 93, an outer cylinder 95, an inner cylinder 96, an engaging portion 94a, a closing wall 94f, a columnar portion 97, and a terminal holding portion 98.

The annular body 93 is annular around the central axis J. The annular body 93 has a plurality of hollow portions 93a. The hollow portion 93a opens on a surface of the annular body portion 93 facing the opposite side of the stator core portion 71. The annular body 93 of the first cover 91 is located below the coil 73, and the annular body 93 of the second cover 92 is located above the coil 73.

As shown in fig. 4, the outer cylindrical portion 95 extends from the outer edge of the annular body portion 93 toward the stator core portion 71 side. The outer cylinder portion 95 and the inner cylinder portion 96 are each cylindrical with the center axis J as the center. On the other hand, the inner cylindrical portion 96 extends from the inner edge of the annular body portion 93 toward the stator core portion 71. The outer cylinder 95 and the inner cylinder 96 of the first cover 91 extend upward from the annular body 93. The outer cylinder 95 and the inner cylinder 96 of the second cover 92 extend downward from the annular body 93. In the following description, the distal ends of the outer cylinder 95 and the inner cylinder 96 represent the ends on the stator core 71 side in the axial direction.

The inner tube portion 96 overlaps the inner wall portion 72c of the insulator 72 when viewed in the axial direction. The front end of the inner tube portion 96 contacts an end surface of the inner wall portion 72c facing in the axial direction. The inner cylinder portion 96 is located radially inward of the coil 73. The inner circumferential surface of the inner tube portion 96 facing radially inward is continuous with the inner side surface of the inner wall portion 72c facing radially inward. The inner circumferential surface of the inner tube portion 96 and the inner surface of the inner wall portion 72c are fitted to the outer circumferential surface of the cylindrical portion 12b of the rotor housing portion 12.

According to the present embodiment, the outer peripheral surface of the cylindrical portion 12b of the support member 10 is fitted in the inner cylindrical portion 96. The clearance between the inner tube portion 96 and the tubular portion 12b is sufficiently small to the extent that the molten resin does not pass through at the time of molding. Therefore, when the resin case 30 is molded, the molten resin can be prevented from flowing from the radially inner side of the inner tube portion 96 to the coil 73 side (i.e., the gap G). As a result, the coil 73 can be separated from the resin case 30, and the coil 73 can be protected.

The outer tube 95 is disposed radially outward of the outer wall 72b of the insulator 72. The outer tube portion 95 covers the vicinity of the upper end of the outer surface of the outer wall portion 72b from the radially outer side. The front end of the outer tube 95 faces the end face of the stator core 71 with a gap therebetween.

As shown in fig. 3, the locking portion 94a extends from the distal end of the outer tube 95 toward the stator core 71. The locking portion 94a of the first cover 91 extends upward from the upper end of the outer cylinder 95. The locking portion 94a of the second cover 92 extends downward from the lower end of the outer cylinder 95.

The locking portion 94a extends along the outer wall portion 72b of the insulator 72. A claw 94aa is provided at the tip of the locking portion 94a. The claw 94aa is locked to a stepped portion 72a provided on the outer surface of the outer wall 72 b. That is, the

covers

91 and 92 have a plurality of claw portions 94aa extending toward the stator core 71 and locked to the insulator 72.

As shown in fig. 7, the locking portions 94a are arranged at equal intervals in the circumferential direction. First cover 91 and second cover 92 of the present embodiment are provided with the same number of locking portions 94a as insulators 72. Each of the locking portions 94a is locked to one of the step portions 72a provided on the insulator 72.

According to the present embodiment, first cover 91 and second cover 92 are assembled to stator 70 from the vertical direction. The locking portion 94a functions as a snap. Therefore, in the assembling step, the locking portion 94a is elastically deformed radially outward until the claw portion 94aa reaches the stepped portion 72a in the assembling step. A reinforcing rib 94ab is provided on the outer peripheral surface of the locking portion 94a. The reinforcing rib 94ab reinforces the locking portion 94a while ensuring the elastic modulus of the locking portion 94a toward the outer side in the radial direction.

According to the present embodiment, the first cover 91 and the second cover 92 are locked and fixed to the stator 70. This can suppress the first cover 91 and the second cover 92 from being displaced relative to the stator 70 when the resin housing 30 is molded. In addition, according to the present embodiment, since first cover 91 and second cover 92 are fixed to stator 70 by fasteners, the assembly process of stator assembly 75 can be simplified.

The closing wall portion 94f extends from the front end portion of the outer cylindrical portion 95 toward the stator core 71 side. Closed wall portion 94f of first cover 91 extends upward from the upper end portion of outer cylindrical portion 95. The closed wall portion 94f of the second cover 92 extends downward from the lower end portion of the outer cylindrical portion 95.

The closing wall 94f is plate-shaped with its thickness direction in the radial direction. The blocking wall 94f is disposed between the locking portions 94a adjacent in the circumferential direction. That is, the blocking wall portion 94f is disposed between the claw portions 94aa in the circumferential direction. As described above, the insulators 72 are arranged in the circumferential direction. The outer wall portion 72b of the one insulator 72 extends in an arc shape along the circumferential direction when viewed in the axial direction. The outer wall portions 72b of the insulators 72 arranged in the circumferential direction are connected in the circumferential direction. Thereby, the outer wall portions 72b of the plurality of insulators 72 form a cylindrical shape. The closed wall 94f covers a gap between the outer wall portions 72b of the insulators 72 arranged in the circumferential direction.

According to the present embodiment, the closed wall portion 94f covers the space between the circumferentially adjacent insulators 72 from the radially outer side. Therefore, when the resin case 30 is molded, the molten resin can be suppressed from flowing into the coil 73 side (i.e., the gap G) from the gap between the insulators 72. As a result, the coil 73 can be separated from the resin case 30, and the coil 73 can be protected.

When the resin housing 30 is molded, the first cover 91 and the second cover 92 are pressed toward the stator core 71 by the resin pressure of the molten resin. The locking portions 94a of the first cover 91 and the second cover 92 have low strength so as to be smoothly elastically deformed at the time of locking. In the present embodiment, the axial front end surface of the closing wall portion 94f contacts the stator core 71. Therefore, the blocking wall 94f can receive the force caused by the resin pressure applied to the first cover 91 and the second cover 92, and can suppress damage to the locking portion 94a.

The columnar portion 97 extends upward from the upper surface of the annular body 93 of the second cover 92. The second cover 92 is provided with three columnar portions 97. The three columnar portions 97 are arranged along the circumferential direction. The through hole (coil holding portion) 97h is open on the upper surface of the columnar portion 97. That is, the through hole 97h is provided in the second cover 92. In the present embodiment, two through holes 97h are opened in one columnar portion 97.

As shown in fig. 4, the through hole 97h extends linearly in the axial direction. The through hole 97h extends in the second cover 92 so as to straddle the annular main body 93 and the columnar portion 97.

The coil wire 73a extending upward from the coil 73 is inserted through the through hole 97h. The through hole 97h functions as a coil holding portion for holding the coil wire 73a. That is, the stator cover 90 has a coil holding portion (through hole 97 h) that holds the coil wire.

In the present embodiment, the holding coil wire 73a is shown to support the coil wire 73a in the axial direction and maintain the posture and position of the coil wire 73a. The inner circumferential surface of the through hole 97h can be in close contact with the coil wire 73a. The diameter of the through hole 97h is preferably 1.5 times or less the diameter of the coil wire 73a.

In the present embodiment, since the coil holding portion for holding the coil 73 is the through hole 97h, the entire outer periphery of the coil wire 73a can be surrounded, and the coil wire 73a can be stably held. However, the coil holding portion may be a notch or the like recessed radially inward from the outer peripheral portion of the second cover 92.

The through hole 97h is provided with a tapered portion 97t whose sectional area decreases toward the upper side (the other side in the axial direction). In the present embodiment, the tapered portion 97t is located at the lower end of the through hole 97h. The cross-sectional shape of the through hole 97h is circular over the entire length including the tapered portion 97t. According to the present embodiment, when assembling stator cover 90, the end portions of coil wires 73a are easily guided into through-holes 97h, and the assembly process of stator assembly 75 can be facilitated.

In the present embodiment, the stator cover 90 holds the coil wire 73a, which is drawn out from the coil 73 and connected to the circuit board 80, in the through hole 97h. This allows the stator cover 90 to position the coil wire 73a and facilitate the connection process of the coil wire 73a to the circuit board 80.

In the present embodiment, the through hole 97h connects the space for housing the coil 73 and the space for housing the circuit board 80 in the case 2. Therefore, the molten resin does not come into contact with the coil wire 73a drawn out from the coil 73 when the resin case 30 is molded. That is, the stator cover 90 protects the drawn coil wire 73a from the molten resin at the through hole 97h.

The through-hole 97h of the present embodiment overlaps the first through-hole 81h of the circuit board 80 when viewed in the axial direction. Therefore, the coil wire 73a extending upward from the through hole 97h can be smoothly inserted into the first through hole 81h of the circuit board 80. Further, since the coil wire 73a is held by the through hole 97h, the coil wire 73a can be stably soldered to the first through hole 81h, and the reliability of connection between the coil wire 73a and the circuit board 80 can be improved.

The through hole 97h of the present embodiment extends in the axial direction inside the columnar portion 97. Further, the columnar portion 97 extends in the axial direction and penetrates the resin case 30 in the axial direction. Therefore, the through-hole 97h can be ensured to be long, and the reliability of holding the coil wire 73a by the through-hole 97h can be improved.

An upper end surface (distal end surface) 97a of the columnar portion 97 is exposed upward with respect to the resin case 30. The resin case 30 is molded by a mold. An upper end surface 97a of the columnar portion 97 faces the circuit board 80, and is provided with an opening of a through hole 97h. Therefore, when the resin case 30 is molded, the coil wire 73a can be more reliably protected without the molten resin intruding into the through hole 97h.

As shown in fig. 7, the terminal holding portion 98 is disposed on the upper surface of the annular body portion 93 of the second cover 92. The terminal holding portion 98 has: a radially extending portion 98a that extends radially outward relative to the second cover 92; and an upper side projecting portion 98b extending upward from a radially outer end of the radially extending portion 98 a. The terminal holding portion 98 embeds and holds a plurality of (three in the present embodiment) terminal terminals 8. The second enclosure 92 is formed by insert molding in which the terminal terminals 8 are embedded.

The terminal 8 has: a base 8c extending in the radial direction; a first end portion 8a extending upward from a radially inner end portion of the base portion 8c; and a second end portion 8b extending upward from a radially outer end portion of the base portion 8 c. The base portion 8c extends radially inside the radially extending portion 98a of the terminal holding portion 98. The first end portion 8a protrudes upward from the radially extending portion 98 a. The second end portion 8b extends upward along the upper protruding portion 98b, and protrudes upward from the upper end surface of the upper protruding portion 98b.

As shown in fig. 2, the first end portions 8a of the terminal terminals 8 pass through the inside of the resin housing 30 and protrude upward from the housing upper surface 30 g. The first end portion 8a is inserted into the second through hole 81k of the circuit board 80 and connected to the circuit board 80 by solder.

The second end portion 8b of the terminal 8 protrudes upward at the connector portion 39 of the resin case 30. The connector portion 39 exposes the second end portion 8b of the terminal 8 and surrounds the second end portion 8b. The second end 8b is connected to the external device 7 connected to the connector portion 39. The external device 7 supplies power to the circuit board 80 via the terminal 8. The circuit board 80 supplies power from the coil wire 73a to the coil 73.

According to the present embodiment, the stator cover 90 has the terminal holding portion 98, and therefore, the terminal terminals 8 can be held in advance to the stator cover 90. Therefore, when the resin case 30 is molded, the terminal 8 can be easily embedded in the resin case 30, and the manufacturing process can be simplified.

The pump cover 20 constitutes a lower end portion of the housing 2. The pump cover 20 is located on the lower side (one axial side) of the motor 3, the resin housing 30, and the support member 10. The pump cover 20 covers the pump section 60. The pump cover 20 includes a pump surrounding portion 22, an upper end cylindrical portion 21, an inlet pipe 26, and an outlet pipe 27 (see fig. 1). The pump surrounding portion 22 covers the pump portion 60 from the radially outer side and the lower side.

A flow path through which water (liquid) flows is provided inside the pump surrounding portion 22. The upper end cylindrical portion 21 extends upward from the upper end portion of the pump surrounding portion 22. The upper end cylindrical portion 21 has a cylindrical shape centered on the central axis J. The upper end cylindrical portion 21 surrounds the outer peripheral surface of the retainer cylindrical portion 31 of the resin case 30.

As shown in fig. 1, the inflow pipe 26 extends downward from the lower end of the pump enclosure 22. The outflow pipe 27 extends radially outward from the outer peripheral portion of the pump surrounding portion 22. The inflow tube 26 and the outflow tube 27 are connected to the internal space of the pump enclosure 22.

The pump cover 20 is joined to the resin case 30 and the support member 10 by welding. The following describes a joint structure between the pump cover 20, the resin case 30, and the support member 10. The pump housing 20 is welded to the resin case 30 and the support member 10 by spin welding.

As shown in fig. 6, the pump cover 20 has an annular first contact surface 20f. The first contact surface 20f has: a main region 20a facing the upper side (the other axial side); and a sub-region 20b facing radially inward. The main region 20a is an upper end surface of the pump surrounding portion 22. The sub-region 20b is located on the inner circumferential surface of the upper end cylindrical portion 21. The main region 20a and the sub region 20b are orthogonal to each other and connected. Both the main region 20a and the sub region 20b extend annularly in the circumferential direction around the central axis J.

The resin case 30 has a second contact surface 30f and a fourth contact surface 30e at a lower end portion. The second contact surface 30f is a flat surface facing downward (one axial side). On the other hand, the fourth contact surface 30e is a curved surface facing radially outward. The second contact surface 30f and the fourth contact surface 30e extend annularly in the circumferential direction around the center axis J. The second contact surface 30f is a lower end portion of the retainer tube portion 31. On the other hand, the fourth contact surface 30e is located on the outer peripheral surface of the retainer tube portion 31. That is, the second contact surface 30f and the fourth contact surface 30e are provided on the retainer cylinder portion 31. The second contact surface 30f is contacted and welded with the main region 20a of the first contact surface 20f in the up-down direction. On the other hand, the fourth contact surface 30e is contacted and welded with the sub-region 20b of the first contact surface 20f in the radial direction.

The support member 10 has a third contact surface 10f at a lower end portion. The third contact surface 10f is a flat surface facing downward (one axial side). The third contact surface 10f extends annularly in the circumferential direction around the central axis J. The third contact surface 10f is a lower end surface of the flange portion 11. That is, the third contact surface 10f is provided on the flange portion 11. The third contact surface 10f is in contact with and welded to the main region of the first contact surface 20f in the up-down direction. The third contact surface 10f is disposed adjacent to the radially inner side of the second contact surface 30 f. The second contact surface 30f and the third contact surface 10f are disposed on the same plane orthogonal to the central axis J.

According to the present embodiment, the first contact surface 20f of the pump cover 20 is welded to the second contact surface 30f of the resin case 30 and the third contact surface 10f of the support member 10. The first contact surface 20f and the second contact surface 30f are welded to each other, whereby the waterproof region A1 and the flow path region A2 in the casing 2 can be sealed from the outside of the casing 2. Further, the first contact surface 20f and the third contact surface 10f are welded to each other, whereby the waterproof region A1 and the flow path region A2 can be sealed from each other in the housing 2. This makes it possible to seal the pump 1 without using a sealing member such as an O-ring, and thus, the number of parts can be reduced, and the pump 1 can be manufactured at low cost and with high reliability.

Further, according to the present embodiment, the resin case 30 and the support member 10 are welded to one contact surface (first contact surface 20 f) of the pump cover 20. Therefore, two members, i.e., the resin case 30 and the support member 10, can be joined to the pump cover 20 by one welding process, and the welding process can be simplified.

According to the present embodiment, since the first contact surface 20f is annular, the welded portion can be arranged in an annular shape, and the inner region and the outer region of the welded portion can be sealed with each other. Further, by forming the first contact surface 20f in an annular shape, spin welding can be employed in which the pump cover 20 is rotated relative to the resin case 30 and the support member 10 to weld the contact surfaces to each other, and the work efficiency of the welding process can be improved.

In the present embodiment, the pump cover 20, the resin case 30, and the support member 10 are joined by spin welding as an example, but other welding methods may be employed. For example, the pump cover 20, the resin case 30, and the support member 10 may be welded by ultrasonic welding, laser welding, or the like.

According to the present embodiment, the first contact surface 20f faces upward, and the second contact surface 30f and the third contact surface 10f welded to the first contact surface 20f face downward. Therefore, welding can be performed while applying axial stress to the contact portion between the first contact surface 20f and the second contact surface 30f and the contact portion between the first contact surface 20f and the third contact surface 10f, and welding efficiency in the case of spin welding can be improved.

As described above, the support member 10 is molded by the resin housing 30. Therefore, the support member 10 and the resin case 30 are in close contact with each other, but are not joined. Therefore, a slight gap is provided between the support member 10 and the resin case 30.

In the present embodiment, the second contact surface 30f of the resin housing 30 and the third contact surface 10f of the support member 10 are arranged adjacent to each other in the radial direction. Therefore, a part of the resin material melted in the welding process enters a minute gap between the support member 10 and the resin case 30 and is solidified. This enables the support member 10 and the resin case 30 to be sealed, and a more reliable sealing structure can be realized.

As described above with reference to fig. 1, the convex portion 11e provided on the outer peripheral surface of the flange portion 11 is fitted into the concave portion 31e of the retainer tube portion 31. According to the present embodiment, the convex portion 11e and the concave portion 31e function as a rotation stopper between the support member 10 and the resin housing 30. Thus, in the welding step by spin welding, the resin case 30 and the support member 10 can be prevented from rotating relative to each other.

According to the present embodiment, the convex portions 11e and the concave portions 31e are arranged in the circumferential direction and fitted to each other. Therefore, a minute gap between the support member 10 and the resin case 30 extends in a wave shape along the circumferential direction. The resin material melted by the spin welding spreads in the circumferential direction in the interface between the first contact surface 20f and the second contact surface 30f and the third contact surface 10f by the rotation at the time of the spin welding. According to the present embodiment, by arranging the gap between the support member 10 and the resin case 30 in a wavy shape in the circumferential direction, the resin material melted at the time of spin welding can be efficiently infiltrated into the gap and solidified, and a highly reliable closed structure can be realized.

As shown in fig. 6, the pump cover 20 of the present embodiment is welded to the fourth contact surface of the resin case 30 at the sub-region 20b of the first contact surface 20f. According to the present embodiment, the sealing reliability can be further improved by securing a wide area of the bonding surface. Further, the weld surface can be formed in a zigzag labyrinth structure, and the reliability of sealing can be improved and the rigidity of the weld portion can be improved.

In the present embodiment, the pump cover 20 has an upper end surface 21a located at the upper end of the upper end cylindrical portion 21. The upper end surface 21a is an annular flat surface facing upward (the other axial side). A stepped portion 30d recessed downward and radially inward is provided at a lower end portion of the outer peripheral surface 30a of the resin case 30. The upper end cylindrical portion 21 of the pump cover 20 is fitted into the step portion 30d.

The step portion 30d has a facing surface 32b facing downward. Namely, the resin case 30 has the opposing face 32b. The opposing surface 32b faces the upper end surface 21a of the upper end cylindrical portion 21 with a gap therebetween. According to the present embodiment, by providing the gap between the opposing surface 32b and the upper end surface 21a, even when the first contact surface 20f and the second contact surface 30f are partially melted in the welding step and the pump cover 20 and the resin case 30 are relatively close to each other in the axial direction, the opposing surface 32b and the upper end surface 21a can be suppressed from interfering with each other.

In the present embodiment, the resin case 30, the pump cover 20, and the support member 10, which are welded to each other, are preferably made of the same resin material. Similarly, the resin case 30 and the substrate cover 28 welded to each other are preferably made of the same resin material. By forming the members to be welded from the same resin material, strong welding can be achieved, thermal strain is less likely to occur after welding, and damage to the welded portion can be suppressed.

While various embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are examples, and additions, omissions, substitutions, and other changes in the configurations can be made without departing from the scope of the present invention. The present invention is not limited to the embodiments.

The use of the pump to which the present invention is applied is not particularly limited. The pump may be installed in any device. The pump may be mounted to a vehicle, for example. The pump may also be a pump that delivers any fluid. The pump may also be an oil pump that delivers oil. The respective configurations described above in the present specification can be appropriately combined within a range not inconsistent with each other.

Claims

1. A pump, comprising:

a rotor rotatable about a central axis;

a stator assembly located radially outward of the rotor and surrounding the rotor;

a pump section connected to one axial side of the rotor;

the circuit substrate is configured on the other axial side of the stator assembly;

a support member having a rotor housing portion that is located radially inward of the stator assembly and that houses the rotor therein; and

a resin case that molds the stator assembly and the support member,

the rotor housing section includes:

a cover portion that covers the rotor from the other axial side; and

a cylindrical portion located radially between the rotor and the stator assembly and opened to one axial side,

the stator assembly has:

an annular stator core;

a plurality of coils mounted to the stator core; and

a stator cover covering a plurality of the coils,

the stator cover has a coil holding portion that holds a coil wire that extends from the coil and is connected to the circuit board.

2. The pump of claim 1,

the coil holding portion is a through hole extending in the axial direction.

3. The pump of claim 2,

the through hole is provided with a taper portion whose sectional area becomes smaller toward the other side in the axial direction.

4. Pump according to claim 2 or 3,

a through hole into which the coil wire is inserted is provided on the circuit substrate,

the coil holding portion overlaps with the through hole when viewed in the axial direction.

5. Pump according to claim 2 or 3,

the stator cover has a columnar portion extending in an axial direction and penetrating the resin case in the axial direction,

the coil holding portion extends in an axial direction inside the columnar portion.

6. The pump of claim 4,

7. The pump of claim 5,

the front end surface of the columnar portion is exposed to the resin case, faces the circuit board, and is provided with an opening of the coil holding portion.

8. The pump of claim 6,

9. The pump according to any one of claims 1 to 3,

having a terminal having a first end portion connected to the circuit substrate and a second end portion connected to an external device,

the resin case has a connector portion that exposes the second end portion and surrounds the second end portion,

the stator cover has a terminal holding portion that embeds and holds the terminal terminals.

10. The pump according to any one of claims 1 to 3,

the stator cover has:

a ring-shaped first cover covering the coil from one axial side; and

an annular second cover covering the coil from the other axial side,

the coil holding portion is provided to the first cover.

11. The pump of claim 10,

the stator assembly has a plurality of insulators interposed between the stator core and the plurality of coils,

the first cover and the second cover have a plurality of claw portions that extend toward the stator core portion side and are locked to the insulator.

12. The pump according to any one of claims 1 to 3,

a gap is provided between the stator case and the coil.