Pump

Abstract

To provide a pump which has enhanced reliability of a stator.SOLUTION: A pump 1 has a rotor 50, a stator assembly 75, a pump part 60 connected to one side in an axial direction of the rotor, a circuit board 80 arranged on the other side in the axial direction of the stator assembly, a support member 10 located inside of a radial direction of the stator assembly and having a rotor housing hart 12 housing the rotor inside, and a resin housing 30 molding the stator assembly and the support member. The rotor housing part has a lid part 12a covering the rotor from the other side in the axial direction, and a cylindrical part 12b located between the rotor and the stator assembly in the radial direction, and opening to one side in the axial direction. The stator assembly has an annular stator core, a plurality of coils attached to the stator core, and a stator cover 90 covering the plurality of coils. The stator cover has a coil holding part 97h holding a coil line extending from the coil and connected to the circuit board.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a pump.

Background Art

[0002] The development of an electric pump in which a motor part, a pump part, and a driver part are integrated in advance has been underway. Patent Document 1 discloses a pump in which a motor part and a pump part are integrated, and a structure in which a stator is molded in order to ensure the waterproofness of the stator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As shown in the prior document, when the stator is molded, the molding resin and the coil come into direct contact. Therefore, there is a risk that the coil wire may be damaged by the heat and injection pressure during the molding of the molding resin.

[0005] In view of the above circumstances, one of the objects of the present invention is to provide a pump with improved reliability of the stator.

Means for Solving the Problems

[0006] One aspect of the pump of the present invention 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, a circuit board disposed on the other axial side of the stator assembly, a support member having a rotor housing section 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 has a lid section covering the rotor from the other axial side, and a cylindrical section located in the radial direction between the rotor and the stator assembly and opening on one axial side. The stator assembly includes an annular stator core, a plurality of coils attached to the stator core, and a stator cover covering the plurality of coils. The stator cover has a coil holding section holding coil wires extending from the coils and connected to the circuit board.

Advantages of the Invention

[0007] According to one aspect of the present invention, a pump with enhanced reliability of the stator can be provided.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0009] Each figure virtually shows the central axis J in the pump 1 of the embodiment described below. In the following description, the axial direction of the central axis J is simply referred to as the "axial direction". The radial direction centered on the central axis J is simply referred to as the "radial direction". The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". The Z-axis shown in each figure indicates the direction in which the central axis J extends. In the following description, the side (+Z side) in the axial direction toward which the arrow of the Z-axis points is referred to as the "upper side", and the side opposite to the side toward which the arrow of the Z-axis points (-Z side) in the axial direction is referred to as the "lower side".

[0010] In the present embodiment, the lower side corresponds to the "one side in the axial direction", and the upper side corresponds to the "other side in the axial direction". Note that the upper side and the lower side are merely names for explaining the relative positional relationship of each part, and the actual arrangement relationship or the like may be an arrangement relationship or the like other than the arrangement relationship or the like indicated by these names.

[0011] FIG. 1 is a perspective view of the pump 1. FIG. 2 is a cross-sectional view of the pump 1. FIGS. 3, 4, 5, and 6 are enlarged views of a part of FIG. 2, respectively. In FIG. 2, for the sake of explanation, cross-sections at different circumferential positions are shown on both the left and right sides sandwiching the central axis J.

[0012] 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 case 2. The motor 3 has a rotor 50 that can rotate about the central axis J, and a stator assembly 75 that is located radially outside the rotor 50 and surrounds the rotor 50. That is, the pump 1 includes the rotor 50 and the stator assembly 75.

[0013] The pump 1 of the present embodiment is a water pump that pumps water. The pump 1 rotates the pump section 60 by the motor 3 to discharge the water (liquid) sucked from the inflow pipe 26 from the outflow pipe 27 (see FIG. 1).

[0014] As shown in FIG. 2, the case 2 houses the motor 3, the pump unit 60, the support member 10, the fixed shaft 40, and the circuit board 80. Inside the case 2, it is divided into a flow path region A2 through which water (liquid) passes and a waterproof region A1 sealed from water. In the flow path region A2, the rotor 50, the fixed shaft 40, and the pump unit 60 are arranged. In the waterproof region A1, the stator assembly 75 and the circuit board 80 are arranged. The flow path region A2 and the waterproof region A1 are partitioned by the support member 10.

[0015] The case 2 has a resin housing (motor housing) 30, a board cover 28, and a pump cover 20. That is, the pump 1 includes the resin housing 30, the board cover 28, and the pump cover 20. The board cover 28 is joined to the upper end portion of the resin housing 30. On the other hand, the pump cover 20 is joined to the lower end portion of the resin housing 30. Thereby, the resin housing 30, the board cover 28, and the pump cover 20 are fixed to each other.

[0016] The resin housing 30 has an embedding portion 32 for molding and embedding the stator assembly 75 and the support member 10. That is, the resin housing 30 is formed by insert molding for inserting the stator assembly 75 and the support member 10. Thereby, the resin housing 30 holds the stator assembly 75 and the support member 10. The resin housing 30 surrounds the stator 70, the rotor 50, and the rotor housing portion 12 from the radially outer side.

[0017] As shown in FIG. 1, the outer peripheral surface 30a of the resin housing 30 is circular when viewed in the axial direction. A connector portion 39 is provided on the outer peripheral surface 30a of the resin housing 30. That is, the resin housing 30 has the connector portion 39. The connector portion 39 protects the terminal terminal 8 connected to the external device 7.

[0018] As shown in FIG. 2, at the upper end of the resin housing 30, a housing upper surface 30g facing upward and a surrounding cylinder portion 38 extending upward from the outer edge of the upper surface 30g are provided. On the other hand, at the lower end of the resin housing 30, a cylindrical holding cylinder portion 31 centered on the central axis J is provided. The resin housing 30 is joined to the substrate cover 28 at the surrounding cylinder portion 38 and joined to the pump cover 20 at the holding cylinder portion 31.

[0019] The housing upper surface 30g faces the circuit board 80 in the vertical direction. On the housing upper surface 30g, bosses for supporting the circuit board 80 from below are provided. The surrounding cylinder portion 38 is cylindrical with the central axis J as the center. The surrounding cylinder portion 38 surrounds the circuit board 80 from the outer side in the radial direction.

[0020] The substrate cover 28 has a plate-shaped cover body 28a extending along a plane orthogonal to the central axis J and a guide rib 28b provided on the lower surface of the cover body 28a. The cover body 28a is circular with the central axis J as the center. The outer diameter of the cover body 28a substantially coincides with the outer diameter of the resin housing 30. The guide rib 28b extends along the circumferential direction. The guide rib 28b is disposed slightly radially inward from the outer edge of the cover body 28a. The outer peripheral surface of the guide rib 28b fits into the inner peripheral surface of the surrounding cylinder portion 38 of the resin housing 30. Thereby, the substrate cover 28 is positioned with respect to the resin housing 30.

[0021] The region located radially outside the guide rib 28b on the lower surface of the cover body 28a contacts the upper end surface of the surrounding cylinder portion 38 of the resin housing 30. The lower surface of the cover body 28a and the upper end surface of the surrounding cylinder portion 38 are welded to each other.

[0022] In the welding process, the substrate cover 28 is rotated while being pressed against the resin housing 30 at its lower surface. In the welding process, the contact portion between the substrate cover 28 and the resin housing 30 is melted and solidified by frictional heat for joining. That is, the substrate cover 28 and the resin housing 30 are joined by spin welding. Note that the substrate cover 28 and the resin housing 30 may be welded by other welding means such as ultrasonic welding or laser welding.

[0023] The circuit board 80 is disposed above (on the other axial direction side) the stator assembly 75. That is, the circuit board 80 is disposed above the stator 70. The circuit board 80 is accommodated in a space surrounded by the radially inner side of the surrounding cylinder portion 38 of the resin housing 30, the housing upper surface 30g, and the substrate cover 28.

[0024] The circuit board 80 includes a plate-shaped substrate body 81 along a plane orthogonal to the central axis J, and a heating element 82 mounted on the upper surface 81a (the surface on the other axial direction side) of the substrate body 81. Further, in addition to the heating element 82, the circuit board 80 has a plurality of elements (not shown) mounted on the upper surface 81a or the lower surface 81b of the substrate body 81.

[0025] The substrate 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 the first through hole 81h and the second through hole 81k. A coil wire 73a extending upward from the stator assembly 75 is inserted into the first through hole 81h and soldered to the substrate body 81. The first end portion 8a of the terminal 8 is inserted into the second through hole 81k and soldered to the substrate body 81. A plurality of the first through holes 81h and the second through holes 81k are provided in the substrate body 81.

[0026] The heating element 82 is arranged on the central axis J. The heating element 82 means an element that generates heat during operation and becomes high temperature among the elements mounted on the substrate body 81. When the circuit board 80 has a plurality of elements, the heating element 82 has a larger heat generation amount compared to other elements. Examples of the heating element 82 include a switching element, a capacitor, a field effect transistor, a driver integrated circuit for driving a field effect transistor, and a power supply integrated circuit.

[0027] The support member (shield member) 10 is made of a non-magnetic 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.

[0028] The rotor housing portion 12 is located on the radially inner side of the stator assembly 75. That is, the rotor housing portion 12 is located on the radially inner side of the stator 70. The rotor housing portion 12 is cylindrical, surrounds the central axis J, and opens downward. The rotor housing portion 12 houses the rotor 50 inside. The rotor housing portion 12 has a lid portion 12a that covers the rotor 50 from above and a cylindrical portion 12b that extends downward from the lid portion 12a.

[0029] The lid portion 12a is in the shape of a disc centered on the central axis J. The lid portion 12a covers the rotor 50 from above (the other side in the axial direction). A holding portion 12c is provided at the center of the lid portion 12a when viewed from the axial direction. The holding portion 12c is a portion that holds the upper end portion of the fixed shaft 40. The holding portion 12c protrudes downward more than other portions of the lid portion 12a.

[0030] The cylindrical portion 12b extends downward from the radially outer peripheral edge portion of the lid portion 12a and is connected to the radially inner peripheral edge portion of the flange portion 11. The cylindrical portion 12b is located between the rotor 50 and the stator assembly 75 in the radial direction. That is, the cylindrical portion 12b is located between the rotor 50 and the stator 70 in the radial direction. The cylindrical portion 12b opens downward.

[0031] According to this embodiment, the rotor housing 12 houses the rotor 50 therein. Further, the rotor housing 12 has a lid portion 12a that covers the rotor 50 from above, and a cylindrical portion 12b that surrounds the periphery of the rotor 50 and opens downward. Thereby, while securing a structure for connecting the pump portion 60 to the lower side of the rotor 50, the rotor housing 12 can seal while separating between the rotor 50 and the stator 70, and can suppress the liquid (water) sent by the pump portion 60 from coming into contact with the stator 70.

[0032] The flange portion 11 is annular and surrounds the central axis J. The flange portion 11 extends radially outward from the lower end (one axial side) of the rotor housing 12. The flange portion 11 is located below the stator 70. The surface facing the lower side of the flange portion 11 (the third contact surface 10f described later) is welded to the pump cover 20.

[0033] The outer peripheral surface of the flange portion 11 is covered by the holding cylinder portion 31 of the resin housing 30. That is, the holding cylinder portion 31 contacts the outer peripheral surface of the flange portion 11 at at least a part of the inner peripheral surface. In this embodiment, the support member 10 is embedded in the resin housing 30 together with the stator assembly 75.

[0034] The flange portion 11 is embedded in the resin housing 30 at a part of the upper surface and the outer peripheral surface, and is exposed from the resin housing 30 at the lower surface. The resin housing 30 has a stepped surface 32a at a portion that embeds the upper surface of the flange portion 11. That is, the resin housing 30 has a stepped surface 32a that contacts the upper surface (the surface facing the other axial side) of the flange portion 11. The resin housing 30 supports the flange portion 11 in the axial direction at the stepped surface 32a.

[0035] As shown in FIG. 1, a plurality of convex portions 11e arranged along the circumferential direction are provided on the outer peripheral surface of the flange portion 11. A plurality of concave portions 31e into which the convex portions 11e are inserted are provided on the inner peripheral surface of the holding cylinder portion 31. The concave portions 31e are formed by the molten resin surrounding the outer peripheral surface of the flange portion and filling between the convex portions 11e during the molding of the resin housing 30. Therefore, the convex portions 11e and the concave portions 31e are in close contact with each other.

[0036] A positioning rib 11d is provided on the lower surface (the surface facing one side in the axial direction) of the flange portion 11. The positioning rib 11d projects downward from the lower surface of the flange portion 11. The positioning rib 11d extends along the circumferential direction around the central axis J. The outer peripheral surface facing the radially outer side of the positioning rib 11d fits into the inner peripheral surface of the pump cover 20. The positioning rib 11d axially aligns the pump cover 20 and the support member 10. Note that 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 axially aligned while allowing an assembly error within the range of the gap.

[0037] As shown in FIG. 2, the fixed shaft 40 extends in the axial direction. The fixed shaft 40 has a columnar shaft main body portion 41 extending in the axial direction around the central axis J, and a holding member 42 disposed on the other side in the axial direction of the shaft main body portion 41. The shaft main body portion 41 and the holding member 42 are made of a metal material having excellent thermal conductivity.

[0038] A screw hole 41h is provided on the lower end surface of the shaft main body portion 41. The screw hole 41h extends in the axial direction around the central axis J. A retaining screw 69 is inserted into the screw hole 41h. The retaining screw 69 suppresses the pump portion 60 from detaching downward.

[0039] At the center of the pump section 60, a retaining recess 61 is provided. The retaining recess 61 opens downward. The retaining recess 61 has a retaining surface 61p facing downward as the bottom surface. Inside the retaining recess 61, the above-described retaining screw 69 is arranged. The seating surface of the head of the retaining screw 69 and the retaining surface 61p of the retaining recess 61 of the pump section 60 face each other axially via a washer 68.

[0040] The lower end surface of the shaft main body portion 41, the retaining screw 69, and the washer 68 are exposed in the flow path of the fluid pumped by the pump section 60. Therefore, the fixed shaft 40, the retaining screw 69, and the washer 68 come into contact with the water (liquid) flowing into the pump section 60 and are water-cooled. For this reason, the heat transmitted from the circuit board 80 to the fixed shaft 40 can be released to the water, and the circuit board 80 can be efficiently cooled.

[0041] As shown in FIG. 5, the holding member 42 is arranged on the upper side (the other axial side) of the shaft main body portion 41. The holding member 42 has a holding member main body 42b and a holding member flange portion (flange portion) 42f extending radially outward from the holding member main body 42b. In the holding member main body 42b, a holding hole portion 42h opening downward is provided. The upper end portion of the shaft main body portion 41 is fitted into the holding hole portion 42h. Thereby, the shaft main body portion 41 is fixed to the holding member 42.

[0042] According to the present embodiment, the fixed shaft 40 has a shaft main body portion 41 and a holding member 42 that are fixed to each other. For this reason, the fixed shaft 40 can be manufactured by assembling the separately manufactured shaft main body portion 41 and the holding member 42, and the fixed shaft 40 can be manufactured at low cost.

[0043] The holding member 42 is embedded in the lid 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 lid portion 12a. Thereby, the fixed shaft 40 is supported by the lid portion 12a. According to the present embodiment, since the holding member flange portion 42f is embedded in the holding portion 12c, the holding member flange portion 42f is hooked on the holding portion 12c with a large area in the axial direction. Thereby, it is possible to suppress the holding member flange portion 42f from coming off downward from the holding portion 12c.

[0044] The holding member flange portion 42f extends radially outward with respect to the shaft main body portion 41. The holding member flange portion 42f has enhanced adhesion to the resin material constituting the holding portion 12c by being surface-treated. Thereby, the intrusion of moisture into the interface between the holding member 42 and the holding portion 12c is suppressed. Therefore, moisture does not reach above the lid portion 12a from the inside of the rotor housing portion 12.

[0045] The holding member 42 has an exposed portion 42a that is exposed upward (the other axial direction side) with respect to the lid portion 12a. That is, the fixed shaft 40 has the exposed portion 42a. The exposed portion 42a is the 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 lid portion 12a.

[0046] A heat conductive material 9 is sandwiched between the exposed portion 42a and the circuit board 80. The heat conductive material 9 of the present embodiment is a sheet-shaped heat dissipation sheet. As the material of the heat conductive material 9, a silicon-based material or the like is used. Note that the heat conductive material 9 may be heat dissipation grease or heat dissipation gel.

[0047] 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 board main body 81 of the circuit board 80. The heat conductive material 9 transfers the heat of the circuit board 80 to the fixed shaft 40.

[0048] According to the present embodiment, the heat conductive material 9 transfers the heat generated in the circuit board 80 to the fixing shaft 40 via the heat conductive material 9. The fixing shaft 40 has a sufficiently large heat capacity compared to the heating element 82 and the substrate body 81. Further, the fixing shaft 40 is cooled by contacting the water (liquid) discharged by the pump unit 60. Therefore, according to the present embodiment, the circuit board 80 can be effectively cooled, and the reliability of the operation of the circuit board 80 can be improved.

[0049] According to the present embodiment, the circuit board 80 is cooled using the fixing shaft 40 provided inside the pump 1. Therefore, the entire pump 1 can be miniaturized in the axial direction as compared with the case where a heat sink is also used above the circuit board 80. In addition, compared with the case of using a heat sink, the seal structure around the heat sink can be omitted, and the manufacturing cost can be reduced.

[0050] In the present embodiment, the heating element 82, the heat conductive material 9, and the exposed portion 42a overlap each other when viewed from the axial direction. Therefore, the heat generated by the heating element 82 can be transmitted to the exposed portion 42a of the fixing shaft 40 via the substrate body 81 and the heat conductive material 9 at the shortest distance, and the heating element 82 can be efficiently cooled by the fixing shaft 40.

[0051] In the present embodiment, the case where the heating element 82 is mounted on the upper surface 81a of the substrate body 81 has been described. In this case, the heat of the heating element 82 is transmitted to the heat conductive material 9 via the circuit board. On the other hand, as shown in FIG. 8 as a modification, the heating element 82 may be mounted on the lower surface 81b (the surface on one side in the axial direction) of the substrate body 81. In this modification, the heat conductive material 109 is in direct contact with the heating element. Therefore, the heat of the heating element can be directly transmitted to the heat conductive material 109, and the cooling efficiency of the heating element 82 can be improved.

[0052] As shown in FIG. 2, the rotor 50 is housed inside the rotor housing portion 12. The rotor 50 is rotatable about the central axis J. The rotor 50 includes a rotor core 51, a magnet 52, a first covering portion 54, and a resin portion 53.

[0053] The rotor core 51 is annular and surrounds the central axis J. A fixed shaft 40 is axially passed through the radially inner side of the rotor core 51. 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. For example, a plurality of magnets 52 are provided at intervals in the circumferential direction. The first covering portion 54 fixes the rotor core 51 and the plurality of magnets 52 to each other. The first covering portion 54, the rotor core 51, and the magnet 52 constitute the rotor assembly 55.

[0054] The resin portion 53 surrounds the central axis J and is cylindrical and extends in the axial direction. A fixed shaft 40 is axially passed through the radially inner side of the resin portion 53. The fixed shaft 40 is inserted into the radially inner side 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.

[0055] The resin portion 53 has a second covering portion 53a that embeds and holds the rotor assembly 55, and an extension portion 53b that extends downward from the second covering portion 53a. The second covering portion 53a has a portion that is located between the fixed shaft 40 and the rotor core 51 in the radial direction. The lower end portion of the extension portion 53b protrudes below the rotor housing portion 12. A retaining recess 61 is provided at the lower end portion of the extension portion 53b. As described above, a retaining screw 69 that suppresses the detachment of the rotor 50 and the pump portion 60 is disposed inside the retaining recess 61.

[0056] 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 radially inwardly away 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.

[0057] The pump portion 60 is connected to the lower side (one axial side) of the rotor 50. In the present embodiment, the pump portion 60 is an impeller. The pump portion 60 is made of resin.

[0058] The pump unit 60 has an impeller main body portion 62 that is connected to the lower end portion of the extending portion 53b of the rotor 50. The resin portion 53 and the impeller main body portion 62 are part of the same single member. The resinous portion including the resin portion 53 and the impeller main body portion 62 is made, for example, by insert molding using the rotor assembly 55 as an insert member.

[0059] The impeller main body portion 62 has a base plate portion 62a, a shroud plate portion 62b, a plurality of blade portions 62c, and a cylindrical portion 62d.

[0060] The base plate portion 62a and the shroud plate portion 62b are circular when viewed from the axial direction. The base plate portion 62a extends radially outward from the outer peripheral surface of the extending portion 53b. The shroud plate portion 62b is below the base plate portion 62a and extends radially outward along the plate surface of the base plate portion 62a.

[0061] The cylindrical portion 62d extends along the axial direction about the central axis J. The cylindrical portion 62d surrounds the extending portion 53b from the radially outer side. The interior of the cylindrical portion 62d is continuous with the space between the base plate portion 62a and the shroud plate portion 62b. The blade portions 62c connect between the base plate portion 62a and the shroud plate portion 62b. The blade portions 62c extend along the radial direction. When the pump unit 60 rotates, the plurality of blade portions 62c send the liquid between the blade portions 62c radially outward.

[0062] The pump unit 60 has a suction port 64 for sucking water (liquid) and a discharge port 65 for discharging water (liquid). The suction port 64 faces downward and faces the inflow pipe 26 in the axial direction. On the other hand, the discharge port 65 faces radially outward and faces the outflow pipe 27 (see FIG. 1) in the radial direction.

[0063] The suction port 64 is provided at the lower end of the cylindrical portion 62d. The suction port 64 opens downward. On the other hand, the discharge port 65 is provided between the base plate portion 62a and the shroud plate portion 62b in the axial direction. The discharge port 65 opens radially outward. The pump section 60 is rotated about the central axis J by the rotor 50, sucks water from the suction port 64 into the interior, and discharges the water from the discharge port 65 to send the water. The water sent by the pump section 60 also flows into the inside of the rotor housing section 12.

[0064] As shown in FIG. 3, the stator assembly 75 has an annular stator core 71, a plurality of coils 73 attached to 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. Further, the stator 70 is composed of the stator core 71, the plurality of coils 73, and the plurality of insulators 72. That is, the stator assembly 75 has the stator 70 and the stator cover 90.

[0065] The stator 70 is located radially outside the rotor 50 and surrounds the rotor 50. The stator 70 is annular and surrounds the rotor housing section 12 and the rotor 50 on the radially outer side of the rotor housing section 12. The stator 70 has a stator core 71, an insulator 72 attached to the stator core 71, and a plurality of coils 73 attached to the stator core 71 via the insulator 72.

[0066] The stator core 71 is located radially outside the rotor housing section 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 71a. Although not shown, the plurality of teeth 71b are arranged side by side along the circumferential direction.

[0067] The radially inner ends of the plurality of teeth 71b face the outer peripheral surface of the cylindrical portion 12b in the rotor housing portion 12 with a slight gap therebetween. That is, in the present embodiment, the stator 70 is arranged in a non-contact state with the outer peripheral surface of the cylindrical portion 12b.

[0068] As shown in FIG. 4, the coil 73 is configured by winding a coil wire 73a around the teeth 71b. An 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 in the stator 70 is the same as the number of teeth 71b.

[0069] As shown in FIG. 3, the insulator 72 is attached to the teeth 71b. The insulator 72 covers the outer peripheral surface of the teeth 71b. The insulator 72 of the present embodiment is vertically divisible. The insulator 72 is assembled to the teeth 71b from the vertical direction. The insulator 72 of the present embodiment is attached for each tooth 71b. The number of insulators 72 provided in the stator 70 is the same as the number of teeth 71b.

[0070] The insulator 72 has an enclosing portion 72d disposed between the coil 73 and the teeth 71b, an outer wall portion 72b located radially outside the coil 73, and an inner wall portion 72c located radially inside the coil 73. The enclosing portion 72d is a rectangular cylindrical shape that covers the outer peripheral surface of the teeth 71b. The outer wall portion 72b and the inner wall portion 72c sandwich the coil 73 from both sides in the radial direction.

[0071] FIG. 7 is a perspective view of the stator assembly 75 of the present embodiment. As shown in FIGS. 3 and 7, a step portion 72a is provided on the outer surface facing the radially outer side of the outer wall portion 72b. The step portion 72a is provided on the upper side and the lower side 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 72b. The step portion 72a forms a step surface facing the stator core 71 side.

[0072] As shown in FIG. 3, two step portions 72a are provided on one insulator 72. Of the two step portions 72a, one is located below the stator core 71 and the other is located above the stator core 71. As shown in FIG. 7, a 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 above and below the stator core 71.

[0073] As shown in FIG. 3, the stator cover 90 covers a 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 above and below the insulator 72. The stator cover 90 is disposed so as to straddle between the outer wall portion 72b and the inner wall portion 72c of the insulator 72.

[0074] The stator cover 90 includes an annular first cover body 91 that covers the coil 73 from below (one side in the axial direction) and an annular second cover body 92 that covers the coil 73 from above (the other side in the axial direction).

[0075] According to the present embodiment, since the stator cover 90 covers the coil 73, the coil 73 can be protected from the molten resin material during the molding of the resin housing 30. Generally, an insulating film is provided on the surface of the coil wire 73a. According to the present embodiment, it is possible to suppress damage to the insulating film of the coil wire 73a due to the heat and injection pressure of the molten resin during the molding of the resin housing 30.

[0076] 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 housing 30 and the coil 73, and it is difficult for the heat of the molten resin during molding to be transmitted to the coil 73. Thereby, damage to the insulating film of the coil wire 73a can be more reliably suppressed.

[0077] Generally, since the coil 73 is formed by winding the coil wire 73a, its outer shape is difficult to stabilize. According to this embodiment, a gap G is provided between the stator cover 90 and the coil 73, so that the stator cover 90 can be assembled to the stator 70 without depending on the shape of the coil 73.

[0078] Since the outer shape of the coil wire 73a is exposed on the surface of the coil 73, the surface has a complex concave-convex shape. Therefore, when the surface of the coil 73 is molded with the resin housing 30, it is difficult for the molten resin to flow into the gaps between the coil wires 73a, and sink marks and the like are likely to occur inside the resin housing 30. In addition, since the surface of the coil 73 has a complex concave-convex shape, it is difficult to control the wall thickness of the resin housing 30, and there is a problem that the dimensional accuracy is difficult to stabilize.

[0079] According to this embodiment, the resin housing 30 covers the stator cover 90 without covering the surface of the coil 73. That is, it is not necessary for the molding resin to cover a complex concave-convex shape, and sink marks of the resin housing 30 can be suppressed and the dimensional accuracy can be stabilized.

[0080] According to this embodiment, when the resin housing 30 is molded, the molten resin material covers the surfaces of the stator cover 90 and the stator core 71. Thereby, each part of the stator 70 can be sealed from the outside. Furthermore, the stator cover 90 is firmly fixed to the stator core 71, and the reliability of protecting the coil 73 by the stator cover 90 can be enhanced.

[0081] According to this embodiment, the stator cover 90 includes a pair of cover bodies 91 and 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. In addition, the stator cover 90 can effectively cover the exposed portion of the coil 73 from above and below by the pair of cover bodies 91 and 92.

[0082] As shown in FIG. 7, the first cover body 91 and the second cover body 92 each have an annular main body portion 93, an outer cylindrical portion 95, an inner cylindrical portion 96, a plurality of locking portions 94a, and a plurality of sealing wall portions 94f. Further, the second cover body 92 further has a plurality of columnar portions 97 and a terminal holding portion 98. That is, the stator cover 90 has an annular main body portion 93, an outer cylindrical portion 95, an inner cylindrical portion 96, a locking portion 94a, a sealing wall portion 94f, a columnar portion 97, and a terminal holding portion 98.

[0083] The annular main body portion 93 is annular about the central axis J. The annular main body portion 93 has a plurality of cutout portions 93a. The cutout portions 93a open to the surface of the annular main body portion 93 facing away from the stator core 71. The annular main body portion 93 of the first cover body 91 is located below the coil 73, and the annular main body portion 93 of the second cover body 92 is located above the coil 73.

[0084] As shown in FIG. 4, the outer cylindrical portion 95 extends from the outer edge of the annular main body portion 93 toward the stator core 71 side. The outer cylindrical portion 95 and the inner cylindrical portion 96 are each cylindrical about the central axis J. On the other hand, the inner cylindrical portion 96 extends from the inner edge of the annular main body portion 93 toward the stator core 71 side. The outer cylindrical portion 95 and the inner cylindrical portion 96 of the first cover body 91 extend upward from the annular main body portion 93. The outer cylindrical portion 95 and the inner cylindrical portion 96 of the second cover body 92 extend downward from the annular main body portion 93. In the following description, the tip of the outer cylindrical portion 95 or the inner cylindrical portion 96 means the end on the stator core 71 side in the axial direction.

[0085] The inner cylindrical portion 96 overlaps the inner wall portion 72c of the insulator 72 when viewed in the axial direction. The tip of the inner cylindrical portion 96 contacts the end surface of the inner wall portion 72c facing the axial direction. The inner cylindrical portion 96 is located radially inside the coil 73. The inner peripheral surface of the inner cylindrical portion 96 facing radially inward is continuous with the inner surface of the inner wall portion 72c facing radially inward. The inner peripheral surface of the inner cylindrical portion 96 and the inner surface of the inner wall portion 72c fit onto the outer peripheral surface of the cylindrical portion 12b of the rotor housing portion 12.

[0086] According to this embodiment, the outer peripheral surface of the cylindrical portion 12b of the support member 10 fits into the inner cylindrical portion 96. The gap between the inner cylindrical portion 96 and the cylindrical portion 12b is small enough that the molten resin during molding does not pass through. Therefore, when the resin housing 30 is molded, the inflow of the molten resin from the radially inner side of the inner cylindrical portion 96 toward the coil 73 side (i.e., the gap G) can be suppressed. As a result, the coil 73 can be separated from the resin housing 30 to protect the coil 73.

[0087] The outer cylindrical portion 95 is disposed on the radially outer side of the outer wall portion 72b of the insulator 72. The outer cylindrical portion 95 covers the vicinity of the upper end portion of the outer side surface of the outer wall portion 72b from the radially outer side. The tip portion of the outer cylindrical portion 95 faces the end surface of the stator core 71 with a gap therebetween.

[0088] As shown in FIG. 3, the locking portion 94a extends from the tip portion of the outer cylindrical portion 95 toward the stator core 71 side. The locking portion 94a of the first cover body 91 extends upward from the upper end portion of the outer cylindrical portion 95. The locking portion 94a of the second cover body 92 extends downward from the lower end portion of the outer cylindrical portion 95.

[0089] The locking portion 94a extends along the outer wall portion 72b of the insulator 72. A claw portion 94aa is provided at the tip portion of the locking portion 94a. The claw portion 94aa is locked to the step portion 72a provided on the outer side surface of the outer wall portion 72b. That is, the cover bodies 91 and 92 have a plurality of claw portions 94aa that extend toward the stator core 71 side and are locked to the insulator 72.

[0090] As shown in FIG. 7, the locking portions 94a are arranged at equal intervals along the circumferential direction. The first cover body 91 and the second cover body 92 of this embodiment are each provided with the same number of locking portions 94a as the insulator 72. Each locking portion 94a is locked to one step portion 72a provided on the insulator 72.

[0091] According to this embodiment, the first cover body 91 and the second cover body 92 are assembled to the stator 70 from the vertical direction. The locking portion 94a functions as a snap fit. Therefore, in the assembling process, the locking portion 94a is elastically deformed radially outward until the claw portion 94aa reaches the step portion 72a in the assembling process. A reinforcing rib 94ab is provided on the outer 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 in the radially outward direction.

[0092] According to this embodiment, the first cover body 91 and the second cover body 92 are locked and fixed to the stator 70. Thereby, during the molding of the resin housing 30, it is possible to suppress the displacement of the first cover body 91 and the second cover body 92 with respect to the stator 70. Further, according to this embodiment, since the first cover body 91 and the second cover body 92 are fixed to the stator 70 by a snap fit, the assembling process of the stator assembly 75 can be simplified.

[0093] The sealing wall portion 94f extends from the tip of the outer cylinder portion 95 toward the stator core 71 side. The sealing wall portion 94f of the first cover body 91 extends upward from the upper end portion of the outer cylinder portion 95. The sealing wall portion 94f of the second cover body 92 extends downward from the lower end portion of the outer cylinder portion 95.

[0094] The sealing wall portion 94f is plate-shaped with the radial direction as the thickness direction. The sealing wall portion 94f is disposed between the locking portions 94a adjacent to each other in the circumferential direction. That is, the sealing 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 one insulator 72 extends in an arc shape along the circumferential direction when viewed from the axial direction. The outer wall portions 72b of the insulators 72 arranged in the circumferential direction are continuous in the circumferential direction. Thereby, the outer wall portions 72b of the plurality of insulators 72 constitute a cylindrical shape. The sealing wall portion 94f covers the gap between the outer wall portions 72b of the insulators 72 arranged in the circumferential direction.

[0095] According to this embodiment, the sealing wall portion 94f covers the space between the adjacent insulators 72 in the circumferential direction from the radially outer side. Therefore, when the resin housing 30 is molded, it is possible to suppress the molten resin from flowing into the coil 73 side (that is, the gap G) from the gap between the insulators 72. As a result, the coil 73 can be separated from the resin housing 30 to protect the coil 73.

[0096] When the resin housing 30 is molded, the first cover body 91 and the second cover body 92 are pressed toward the stator core 71 by the resin pressure of the molten resin. The locking portions 94a of the first cover body 91 and the second cover body 92 have low strength in order to elastically deform smoothly during locking. In this embodiment, the end face of the sealing wall portion 94f facing the axial direction contacts the stator core 71. Therefore, the sealing wall portion 94f can receive the force caused by the resin pressure applied to the first cover body 91 and the second cover body 92 and suppress damage to the locking portion 94a.

[0097] The columnar portions 97 extend upward from the upper surface of the annular main body portion 93 of the second cover body 92. Three columnar portions 97 are provided on the second cover body 92. The three columnar portions 97 are arranged along the circumferential direction. A through hole (coil holding portion) 97h opens on the upper surface of the columnar portion 97. That is, the through hole 97h is provided in the second cover body 92. In this embodiment, two through holes 97h open in one columnar portion 97.

[0098] As shown in FIG. 4, the through hole 97h extends linearly in the axial direction. The through hole 97h extends across the annular main body portion 93 and the columnar portion 97 in the second cover body 92.

[0099] A coil wire 73a extending upward from the coil 73 is inserted into 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 97h) for holding the coil wire.

[0100] In the present embodiment, holding the coil wire 73a means supporting the coil wire 73a along the axial direction to maintain the posture and position of the coil wire 73a. The inner peripheral surface of the through-hole 97h may be in close contact with the coil wire 73a. The aperture diameter of the through-hole 97h is preferably 1.5 times or less the wire diameter of the coil wire 73a.

[0101] In the present embodiment, since the coil holding portion that holds 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 provided so as to be recessed radially inward from the outer peripheral portion of the second cover body 92.

[0102] The through-hole 97h is provided with a tapered portion 97t whose cross-sectional area decreases as it goes upward (the other axial direction side). 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 the stator cover 90, it becomes easier to guide the end of the coil wire 73a into the through-hole 97h, and the assembly process of the stator assembly 75 can be facilitated.

[0103] In the present embodiment, the stator cover 90 holds the coil wire 73a drawn from the coil 73 in the through-hole 97h and connected to the circuit board 80. Thereby, the stator cover 90 can position the coil wire 73a and facilitate the connection process of the coil wire 73a to the circuit board 80.

[0104] In the present embodiment, the through-hole 97h connects the space where the coil 73 is accommodated and the space where the circuit board 80 is accommodated inside the case 2. For this reason, when molding the resin housing 30, the molten resin does not come into contact with the coil wire 73a drawn from the coil 73. That is, the stator cover 90 can protect the drawn coil wire 73a from the molten resin in the through-hole 97h.

[0105] The through hole 97h of this embodiment overlaps with the first through hole 81h of the circuit board 80 when viewed from 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 the connection between the coil wire 73a and the circuit board 80 can be enhanced.

[0106] The through hole 97h of this embodiment extends axially inside the columnar portion 97. Further, the columnar portion 97 extends along the axial direction and penetrates the resin housing 30 in the axial direction. Therefore, a long through hole 97h can be ensured, and the certainty of holding the coil wire 73a by the through hole 97h can be enhanced.

[0107] The upper end surface (tip surface) 97a of the columnar portion 97 is exposed upward with respect to the resin housing 30. During the molding of the resin housing 30, it is covered by a mold. The upper end surface 97a of the columnar portion 97 faces the circuit board 80, and an opening of the through hole 97h is provided. Therefore, during the molding of the resin housing 30, the molten resin does not enter the inside of the through hole 97h, and the coil wire 73a can be more reliably protected.

[0108] As shown in FIG. 7, the terminal holding portion 98 is disposed on the upper surface of the annular main body portion 93 of the second cover body 92. The terminal holding portion 98 has a radially extending portion 98a extending radially outward with respect to the second cover body 92, and an upper protruding portion 98b extending upward from the radially outer end of the radially extending portion 98a. The terminal holding portion 98 embeds and holds a plurality (three in this embodiment) of terminal terminals 8 inside. The second cover body 92 is formed by insert molding for inserting the terminal terminals 8.

[0109] The terminal terminal 8 has a base portion 8c extending along the radial direction, a first end portion 8a extending upward from the radially inner end portion of the base portion 8c, and a second end portion 8b extending upward from the radially outer end portion of the base portion 8c. The base portion 8c extends along the radial direction inside the radially extending portion 98a of the terminal holding portion 98. The first end portion 8a protrudes upward from the radially extending portion 98a. 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.

[0110] As shown in FIG. 2, the first end portion 8a of the terminal terminal 8 passes through the inside of the resin housing 30 and protrudes upward from the upper surface 30g of the housing. 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.

[0111] The second end portion 8b of the terminal terminal 8 protrudes upward in the connector portion 39 of the resin housing 30. The connector portion 39 exposes the second end portion 8b of the terminal terminal 8 and surrounds the periphery. The second end portion 8b is connected to an external device 7 connected to the connector portion 39. The external device 7 supplies power to the circuit board 80 via the terminal terminal 8. Further, the circuit board 80 supplies power from the coil wire 73a to the coil 73.

[0112] According to the present embodiment, since the stator cover 90 has the terminal holding portion 98, the terminal terminal 8 can be held in the stator cover 90 in advance. Therefore, when the resin housing 30 is molded, the terminal terminal 8 can be easily embedded inside the resin housing 30, and the manufacturing process can be simplified.

[0113] The pump cover 20 constitutes the lower end portion of the case 2. The pump cover 20 is located below (on one axial side) the motor 3, the resin housing 30, and the support member 10. The pump cover 20 covers the pump portion 60. The pump cover 20 has a pump surrounding portion 22, an upper end cylindrical portion 21, an inflow pipe 26, and an outflow pipe 27 (see FIG. 1). The pump surrounding portion 22 covers the pump portion 60 from the radially outer side and the lower side.

[0114] Inside the pump enclosure 22, a flow path through which water (liquid) flows is provided. The upper end cylindrical portion 21 extends upward from the upper end portion of the pump enclosure 22. The upper end cylindrical portion 21 is cylindrical with the central axis J as the center. The upper end cylindrical portion 21 surrounds the outer peripheral surface of the holding cylindrical portion 31 of the resin housing 30.

[0115] As shown in FIG. 1, the inflow pipe 26 extends downward from the lower end portion of the pump enclosure 22. Further, the outflow pipe 27 extends radially outward from the outer peripheral portion of the pump enclosure 22. The inflow pipe 26 and the outflow pipe 27 are connected to the internal space of the pump enclosure 22.

[0116] The pump cover 20 is joined to the resin housing 30 and the support member 10 by welding. Hereinafter, the joining configuration of the pump cover 20 with the resin housing 30 and the support member 10 will be described. The pump cover 20 is welded to the resin housing 30 and the support member 10 by spin welding.

[0117] 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 upward (the other axial direction side) and a sub-region 20b facing radially inward. The main region 20a is the upper end surface of the pump enclosure 22. The sub-region 20b is located on the inner peripheral surface of the upper end cylindrical portion 21. The main region 20a and the sub-region 20b are connected to each other orthogonally. The main region 20a and the sub-region 20b both extend annularly along the circumferential direction with the central axis J as the center.

[0118] The resin housing 30 has a second contact surface 30f and a fourth contact surface 30e at its lower end. The second contact surface 30f is a flat surface facing the lower side (the other side in the axial direction). On the other hand, the fourth contact surface 30e is a curved surface facing the outer side in the radial direction. The second contact surface 30f and the fourth contact surface 30e extend annularly along the circumferential direction around the central axis J. The second contact surface 30f is the lower end surface of the holding cylinder portion 31. On the other hand, the fourth contact surface 30e is located on the outer peripheral surface of the holding cylinder portion 31. That is, the second contact surface 30f and the fourth contact surface 30e are provided on the holding cylinder portion 31. The second contact surface 30f contacts and is welded to the main region 20a of the first contact surface 20f in the vertical direction. On the other hand, the fourth contact surface 30e contacts and is welded to the sub-region 20b of the first contact surface 20f in the radial direction.

[0119] The support member 10 has a third contact surface 10f at its lower end. The third contact surface 10f is a flat surface facing the lower side (the other side in the axial direction). The third contact surface 10f extends annularly along the circumferential direction around the central axis J. The third contact surface 10f is the 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 contacts and is welded to the main region of the first contact surface 20f in the vertical direction. The third contact surface 10f is arranged adjacent to the inner side in the radial direction of the second contact surface 30f. The second contact surface 30f and the third contact surface 10f are arranged on the same plane orthogonal to the central axis J.

[0120] 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 housing 30 and the third contact surface 10f of the support member 10. By welding the first contact surface 20f to the second contact surface 30f, the waterproof region A1 and the flow path region A2 inside the case 2 can be sealed from the outside of the case 2. Also, by welding the first contact surface 20f to the third contact surface 10f, the waterproof region A1 and the flow path region A2 can be sealed from each other inside the case 2. Thereby, the sealing of the pump 1 can be realized without using a sealing member such as an O-ring, the number of parts can be reduced, and an inexpensive and highly reliable pump 1 can be manufactured.

[0121] In addition, according to the present embodiment, the resin housing 30 and the support member 10 are welded to one contact surface (the first contact surface 20f) of the pump cover 20. Therefore, in a single welding process, it becomes possible to join the two members of the resin housing 30 and the support member 10 to the pump cover 20, and the welding process can be simplified.

[0122] According to the present embodiment, since the first contact surface 20f is annular, the welded portions can be arranged annularly, and the inner region and the outer region of the welded portions can be sealed from each other. In addition, by making the first contact surface 20f annular, it becomes possible to employ spin welding in which the pump cover 20 is rotated with respect to the resin housing 30 and the support member 10 to weld the contact surfaces to each other, and the working efficiency of the welding process can be improved.

[0123] Note that, in the present embodiment, the case where the pump cover 20, the resin housing 30, and the support member 10 are joined by spin welding is illustrated, but other welding means may be employed. As an example, the pump cover 20, the resin housing 30, and the support member 10 may be welded by ultrasonic welding, laser welding, or the like.

[0124] 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 an axial stress to the contact portion between the first contact surface 20f and the second contact surface 30f and the third contact surface 10f, and the welding efficiency in the case of employing spin welding can be improved.

[0125] As described above, the support member 10 is molded by the resin housing 30. Therefore, the support member 10 and the resin housing 30 are in close contact with each other, but are not joined. Therefore, a minute gap is provided between the support member 10 and the resin housing 30.

[0126] In this 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 into the minute gap between the support member 10 and the resin housing 30 and solidifies. Thereby, sealing between the support member 10 and the resin housing 30 becomes possible, and a more reliable sealing structure can be realized.

[0127] As described above with reference to FIG. 1, the convex portion 11e provided on the outer peripheral surface of the flange portion 11 fits into the concave portion 31e of the holding cylinder portion 31. According to this 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. Thereby, in the welding process by spin welding, relative rotation between the resin housing 30 and the support member 10 can be suppressed.

[0128] According to this embodiment, the convex portion 11e and the concave portion 31e are arranged along the circumferential direction and fit into each other. Therefore, the minute gap between the support member 10 and the resin housing 30 extends in a wave shape along the circumferential direction. The resin material melted by spin welding spreads the interface between the first contact surface 20f, the second contact surface 30f, and the third contact surface 10f in the circumferential direction due to the rotation during spin welding. According to this embodiment, by arranging the gap between the support member 10 and the resin housing 30 in a wave shape along the circumferential direction, the resin material melted during spin welding can effectively penetrate into the gap and solidify, realizing a highly reliable sealing structure.

[0129] As shown in FIG. 6, the pump cover 20 of this embodiment is welded to the fourth contact surface of the resin housing 30 in the sub-region 20b of the first contact surface 20f. According to this embodiment, the area of the welding surface can be widely secured to further enhance the reliability of sealing. In addition, a labyrinth structure with an intricate welding surface can be adopted to enhance the certainty of sealing and the rigidity of the welded portion.

[0130] 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 direction side). At the lower end portion of the outer peripheral surface 30a of the resin housing 30, a stepped portion 30d that is recessed downward and radially inward is provided. The upper end cylindrical portion 21 of the pump cover 20 is fitted into the stepped portion 30d.

[0131] The stepped portion 30d has a facing surface 32b facing downward. That is, the resin housing 30 has the facing surface 32b. The facing 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 a gap between the facing surface 32b and the upper end surface 21a, a part of the first contact surface 20f and the second contact surface 30f melts in the welding process, and even when the pump cover 20 and the resin housing 30 approach relatively in the axial direction, it is possible to suppress the interference between the facing surface 32b and the upper end surface 21a.

[0132] In the present embodiment, it is preferable that the resin housing 30, the pump cover 20, and the support member 10 that are welded to each other are made of the same type of resin material. Similarly, it is preferable that the resin housing 30 and the substrate cover 28 that are welded to each other are made of the same type of resin material. By forming the members to be welded from the same type of resin material, strong welding can be achieved, and it is possible to suppress the occurrence of thermal distortion and damage to the welded portion even after welding.

[0133] As described above, various embodiments of the present invention have been described. However, each configuration and their combinations in each embodiment are examples, and additions, omissions, substitutions, and other changes of the configuration are possible without departing from the spirit of the present invention. Further, the present invention is not limited by the embodiments.

[0134] For example, the use of the pump to which the present invention is applied is not particularly limited. The pump may be mounted on any device. The pump may be mounted on, for example, a vehicle. The pump may be a pump for sending any fluid. The pump may be an oil pump for sending oil. In addition, as described above, each configuration described in this specification can be appropriately combined within a range that does not conflict with each other.

Explanation of Reference Numerals

[0135] 1…Pump, 3…Motor, 7…External device, 8…Terminal terminal, 8a…First end, 8b…Second end, 9, 109…Thermal conductive material, 10…Support member, 10f…Third contact surface, 11…Flange portion, 11d…Positioning rib, 11e…Protrusion, 12…Rotor housing, 12a…Cover portion, 12b…Cylindrical portion, 12c…Holding portion, 20…Pump cover, 20a…Main region, 20b…Sub region, 20f…First contact surface, 30…Resin housing (motor housing), 30a…Outer peripheral surface, 30e…Fourth contact surface, 30f…Second contact surface, 31…Holding cylinder portion, 31e…Recess, 32a…Step surface, 32b…Opposing surface, 39…Connector portion, 40…Fixed shaft, 41…Shaft main body portion, 42…Holding member, 42a…Exposed portion, 42f…Holding member flange portion (flange portion), 50…Rotor, 60…Pump portion, 64…Suction port, 65…Discharge port, 70…Stator, 71…Stator core, 72…Insulator, 73…Coil, 73a…Coil wire, 75…Stator assembly, 80…Circuit board, 81…Board main body, 81h…First through hole (through hole), 82…Heat generating element, 90…Stator cover, 91…First cover body (cover body), 92…Second cover body (cover body), 94aa…Claw portion, 94f…Sealing wall portion, 96…Inner cylinder portion, 97…Columnar portion, 97a…Upper end surface (tip surface), 97h…Through hole (coil holding portion), 97t…Taper portion, 98…Terminal holding portion, G…Gap, J…Central axis

Claims

1. 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, A circuit board disposed on 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, A resin housing that molds the stator assembly and the support member, and The rotor housing portion includes A lid portion that covers the rotor from the other axial side, A cylindrical portion located in the radial direction between the rotor and the stator assembly and opening on one axial side, and The stator assembly includes An annular stator core, A plurality of coils attached to the stator core, A stator cover that covers the plurality of coils, and The stator cover has a coil holding portion that holds coil wires extending from the coils and connected to the circuit board, The coil holding portion is a through hole extending along the axial direction, A gap in which the resin material constituting the resin housing is not filled is provided between the stator cover and the coils, One axial end of the through hole opens into the gap, Pump.

2. The through hole is provided with a tapered portion whose cross-sectional area decreases toward the other axial side, The pump according to claim 1.

3. The circuit board is provided with through holes into which the coil wires are inserted, When viewed from the axial direction, the coil holding portion overlaps with the through holes, The pump according to claim 1 or 2.

4. The stator cover has a columnar portion extending along the axial direction and penetrating the resin housing in the axial direction, The coil holding portion extends along the axial direction inside the columnar portion, The pump according to any one of claims 1 to 3.

5. The tip surface of the columnar portion is exposed to the resin housing and faces the circuit board, and an opening of the coil holding portion is provided, The pump according to claim 4.

6. 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, A circuit board disposed on 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, A resin housing that molds the stator assembly and the support member, The rotor housing includes A lid portion that covers the rotor from the other axial side, A cylindrical portion that is located between the rotor and the stator assembly in the radial direction and opens on one axial side, The stator assembly includes An annular stator core, A plurality of coils attached to the stator core, A stator cover that covers the plurality of coils, The stator cover has a coil holding portion that holds coil wires extending from the coils and connected to the circuit board, The stator cover includes An annular first cover body that covers the coil from one axial side, An annular second cover body that covers the coil from the other axial side, The coil holding portion is provided on the second cover body, The stator assembly has a plurality of insulators interposed between the stator core and the plurality of coils, The first cover body and the second cover body have a plurality of claw portions that extend toward the stator core side and are locked to the insulators, Pump.

7. A rotor rotatable about a central axis, A stator assembly located outside the rotor in the radial direction and surrounding the rotor, A pump portion connected to one axial side of the rotor, A circuit board disposed on the other axial side of the stator assembly, A support member having a rotor housing portion located inside the stator assembly in the radial direction and housing the rotor therein, A resin housing that molds the stator assembly and the support member, The rotor housing includes A lid portion that covers the rotor from the other axial side, A cylindrical portion that is located between the rotor and the stator assembly in the radial direction and opens on one axial side, The stator assembly includes An annular stator core, A plurality of coils attached to the stator core, A stator cover that covers the plurality of coils, The stator cover has a coil holding portion that holds coil wires extending from the coils and connected to the circuit board, A terminal terminal having a first end connected to the circuit board and a second end connected to an external device, The resin housing has a connector portion that exposes the second end and surrounds the periphery, The stator cover has a terminal holding portion that embeds and holds the terminal terminal, Pump.

Images