JP7703385B2 - pump - Google Patents

Description

The present invention relates to a pump.

The development of electric pumps in which the motor and pump are already integrated is underway. Patent Document 1 discloses a pump in which the motor and pump are integrated, with a molded stator structure to ensure that the stator is waterproof.

Patent No. 4894375

In Patent Document 1, a seal member is sandwiched between the housing that molds the stator and the member that surrounds the impeller. When adopting such a structure, there is a problem that the assembly process becomes complicated.

In view of the above, one of the objectives of the present invention is to provide a pump that can achieve a highly reliable sealing structure using a simple manufacturing process.

One embodiment of the pump of the present invention includes a rotor rotatable about a central axis, a stator located radially outside the rotor and surrounding the rotor, a pump section connected to one axial side of the rotor, a support member located radially inside the stator and having a rotor housing section that houses the rotor inside, a motor housing that surrounds the stator, the rotor, and the rotor housing section from the radial outside, and a pump cover located on one axial side of the motor housing and the support member and covering the pump section. The pump cover has an annular first contact surface. The motor housing has a second contact surface that contacts the first contact surface. The support member has a third contact surface that contacts the first contact surface. The first contact surface is welded to the second contact surface and the third contact surface.

According to one aspect of the present invention, a pump can be provided that can achieve a highly reliable sealing structure through a simple manufacturing process.

FIG. 1 is a perspective view of a pump according to one embodiment. FIG. 2 is a cross-sectional view of a pump according to one embodiment. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a partially enlarged view of FIG. FIG. 5 is a partially enlarged view of FIG. FIG. 6 is a partially enlarged view of FIG. FIG. 7 is a perspective view of a stator assembly according to one embodiment. FIG. 8 is a partial cross-sectional view of a modified pump.

Each figure shows an imaginary central axis J of a pump 1 according to an 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 in the axial direction toward which the Z-axis arrow points (+Z side) is referred to as the "upper side," and the side opposite to the side toward which the Z-axis arrow points (-Z side) is referred to as the "lower side."

In this embodiment, the lower side corresponds to the "one axial side," and the upper side corresponds to the "other axial side." Note that the terms "upper side" and "lower side" are names used simply to describe the relative positional relationships of the various parts, and the actual positional relationships may be other than those indicated by these names.

Figure 1 is a perspective view of pump 1. Figure 2 is a cross-sectional view of pump 1. Figures 3, 4, 5, and 6 are enlarged views of parts of Figure 2. For the sake of explanation, Figure 2 shows cross sections at different circumferential positions on both the left and right sides of the central axis J.

As shown in FIG. 2, the pump 1 of this 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 includes a rotor 50 that can rotate about a central axis J, and a stator assembly 75 that is positioned radially outward of the rotor 50 and surrounds the rotor 50. That is, the pump 1 includes the rotor 50 and the stator assembly 75.

The pump 1 in this embodiment is a water pump that pumps water. The pump 1 discharges water (liquid) sucked in from the inlet pipe 26 through the outlet pipe 27 (see FIG. 1) by rotating the pump section 60 with the motor 3.

As shown in FIG. 2, the case 2 houses the motor 3, pump unit 60, support member 10, fixed shaft 40, and circuit board 80. The inside of the case 2 is divided into a flow path area A2 through which water (liquid) passes, and a waterproof area A1 that is sealed off from water. The rotor 50, fixed shaft 40, and pump unit 60 are arranged in the flow path area A2. The stator assembly 75 and circuit board 80 are arranged in the waterproof area A1. The flow path area A2 and the waterproof area A1 are separated by the support member 10.

The case 2 has a resin housing (motor housing) 30, a board cover 28, and a pump cover 20. That is, the pump 1 comprises the resin housing 30, the board cover 28, and the pump cover 20. The board cover 28 is joined to the upper end of the resin housing 30. Meanwhile, the pump cover 20 is joined to the lower end of the resin housing 30. In this way, the resin housing 30, the board cover 28, and the pump cover 20 are fixed to one another.

The resin housing 30 has an embedding section 32 in which the stator assembly 75 and the support member 10 are molded and embedded. That is, the resin housing 30 is formed by insert molding in which the stator assembly 75 and the support member 10 are inserted. In this way, 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 accommodating section 12 from the radial outside.

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. In other words, the resin housing 30 has the connector portion 39. The connector portion 39 protects the terminal 8 that is connected to the external device 7.

As shown in FIG. 2, the upper end of the plastic housing 30 is provided with an upwardly facing housing upper surface 30g and an enclosing tube portion 38 extending upward from the outer edge of the upper surface 30g. Meanwhile, the lower end of the plastic housing 30 is provided with a cylindrical retaining tube portion 31 centered on the central axis J. The plastic housing 30 is joined to the board cover 28 at the enclosing tube portion 38, and joined to the pump cover 20 at the retaining tube portion 31.

The housing top surface 30g faces the circuit board 80 in the vertical direction. A boss that supports the circuit board 80 from below is provided on the housing top surface 30g. The surrounding tube portion 38 is cylindrical and has a center on the central axis J. The surrounding tube portion 38 surrounds the circuit board 80 from the radial outside.

The board cover 28 has a plate-shaped cover body 28a extending along a plane perpendicular to the central axis J, and a guide rib 28b provided on the underside of the cover body 28a. The cover body 28a is circular, centered on the central axis J. The outer diameter of the cover body 28a is approximately the same as the outer diameter of the plastic housing 30. The guide rib 28b extends in the circumferential direction. The guide rib 28b is positioned 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 enclosing tube portion 38 of the plastic housing 30. This positions the board cover 28 relative to the plastic housing 30.

The area of the underside of the cover body 28a that is located radially outward from the guide rib 28b contacts the upper end surface of the enclosing tube portion 38 of the resin housing 30. The underside of the cover body 28a and the upper end surface of the enclosing tube portion 38 are welded to each other.

In the welding process, the board cover 28 is rotated while its underside is pressed against the resin housing 30. In the welding process, the contact area between the board cover 28 and the resin housing 30 is melted and solidified by frictional heat to join them. That is, the board cover 28 and the resin housing 30 are joined by spin welding. Note that the board cover 28 and the resin housing 30 may also be welded by other welding methods such as ultrasonic welding and laser welding.

The circuit board 80 is disposed above the stator assembly 75 (the other axial side). In other words, 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 enclosing cylinder portion 38 of the resin housing 30, the housing top surface 30g, and the board cover 28.

The circuit board 80 has a plate-shaped board body 81 along a plane perpendicular to the central axis J, and a heating element 82 mounted on the upper surface 81a (the surface on the other axial side) of the board body 81. In addition to the heating element 82, the circuit board 80 also has a plurality of elements (not shown) mounted on the upper surface 81a or the lower surface 81b of the board body 81.

The board body 81 has a first through hole (through hole) 81h and a second through hole 81k that penetrate in the thickness direction. That is, the circuit board 80 is provided with the first through hole 81h and the 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 body 81. The first end 8a of the terminal 8 is inserted into the second through hole 81k and soldered to the board body 81. A plurality of first through holes 81h and second through holes 81k are provided in the board body 81.

The heating element 82 is disposed on the central axis J. The heating element 82 refers to an element mounted on the board body 81 that generates heat and becomes hot during operation. When the circuit board 80 has multiple elements, the heating element 82 generates a large amount of heat compared to the 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.

The support member (shield member) 10 is made of a non-magnetic material. In this 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 accommodating portion 12 is located radially inside the stator assembly 75. In other words, the rotor accommodating portion 12 is located radially inside the stator 70. The rotor accommodating portion 12 is cylindrical and surrounds the central axis J, opening downward. The rotor accommodating portion 12 accommodates the rotor 50 inside. The rotor accommodating 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.

The lid portion 12a is disk-shaped and centered on the central axis J. The lid portion 12a covers the rotor 50 from above (the other axial side). A holding portion 12c is provided in 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 of the fixed shaft 40. The holding portion 12c protrudes downward further than the other portions of the lid portion 12a.

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

According to this embodiment, the rotor accommodating section 12 accommodates the rotor 50 inside. The rotor accommodating section 12 also has a lid section 12a that covers the rotor 50 from above, and a cylindrical section 12b that surrounds the rotor 50 and opens to the bottom. As a result, the rotor accommodating section 12 can seal the rotor 50 and the stator 70 while ensuring a structure that connects the pump section 60 to the underside of the rotor 50, and can prevent the liquid (water) pumped by the pump section 60 from coming into contact with the stator 70.

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 accommodating portion 12. The flange portion 11 is located below the stator 70. The surface of the flange portion 11 facing downward (the third contact surface 10f described later) is welded to the pump cover 20.

The outer peripheral surface of the flange portion 11 is covered by the retaining tube portion 31 of the resin housing 30. That is, the retaining tube portion 31 contacts the outer peripheral surface of the flange portion 11 on at least a portion of its inner peripheral surface. In this embodiment, the support member 10 is embedded in the resin housing 30 together with the stator assembly 75.

The flange portion 11 is embedded in the resin housing 30 at a portion of its upper surface and its outer peripheral surface, and is exposed from the resin housing 30 at its lower surface. The resin housing 30 has a step surface 32a in the portion where the upper surface of the flange portion 11 is embedded. In other words, the resin housing 30 has a step surface 32a that contacts the upper surface of the flange portion 11 (the surface facing the other axial direction). The resin housing 30 supports the flange portion 11 in the axial direction at the step surface 32a.

As shown in FIG. 1, the outer peripheral surface of the flange portion 11 is provided with a plurality of protrusions 11e aligned in the circumferential direction. The inner peripheral surface of the retaining tube portion 31 is provided with a plurality of recesses 31e into which the protrusions 11e are inserted. The recesses 31e are formed when the resin housing 30 is molded by filling the protrusions 11e with molten resin surrounding the outer peripheral surface of the flange portion. As a result, the protrusions 11e and the recesses 31e are in close contact with each other.

A positioning rib 11d is provided on the underside of the flange portion 11 (the surface facing one axial direction). The positioning rib 11d protrudes downward from the underside of the flange portion 11. The positioning rib 11d extends in the circumferential direction around the central axis J. The outer peripheral surface of the positioning rib 11d facing radially outward 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 relative to one another. Note that a small 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 for assembly errors within the range of the gap.

As shown in FIG. 2, the fixed shaft 40 extends in the axial direction. The fixed shaft 40 has a cylindrical shaft body 41 that extends in the axial direction around a central axis J, and a retaining member 42 that is disposed on the other axial side of the shaft body 41. The shaft body 41 and the retaining member 42 are made of a metal material with excellent thermal conductivity.

A screw hole 41h is provided on the lower end surface of the shaft body 41. The screw hole 41h extends in the axial direction about the central axis J. A retaining screw 69 is inserted into the screw hole 41h. The retaining screw 69 prevents the pump section 60 from coming off downwards.

A retaining recess 61 is provided in the center of the pump section 60. The retaining recess 61 opens downward. The retaining recess 61 has a retaining surface 61p facing downward as its bottom surface. The retaining screw 69 described above is placed inside the retaining recess 61. The seat 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 in the axial direction via a washer 68.

The lower end surface of the shaft body 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. As a result, the heat transferred from the circuit board 80 to the fixed shaft 40 can be released to the water, allowing the circuit board 80 to be efficiently cooled.

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

According to this embodiment, the fixed shaft 40 has a shaft body 41 and a retaining member 42 that are fixed to each other. Therefore, the fixed shaft 40 can be manufactured by assembling the shaft body 41 and the retaining member 42 that are manufactured separately, and the fixed shaft 40 can be manufactured inexpensively.

The retaining member 42 is embedded in the lid portion 12a of the support member 10 by insert molding. More specifically, the retaining member flange portion 42f of the retaining member 42 is embedded in the retaining portion 12c of the lid portion 12a. This allows the fixed shaft 40 to be supported by the lid portion 12a. According to this embodiment, by embedding the retaining member flange portion 42f in the retaining portion 12c, the retaining member flange portion 42f is caught by the retaining portion 12c over a large area in the axial direction. This makes it possible to prevent the retaining member flange portion 42f from slipping out downward from the retaining portion 12c.

The retaining member flange portion 42f extends radially outward relative to the shaft body portion 41. The retaining member flange portion 42f is surface-treated to enhance adhesion to the resin material that constitutes the retaining portion 12c. This prevents moisture from penetrating the interface between the retaining member 42 and the retaining portion 12c. Therefore, moisture does not reach the upper side of the lid portion 12a from inside the rotor accommodating portion 12.

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

The thermally conductive material 9 is sandwiched between the exposed portion 42a and the circuit board 80. In this embodiment, the thermally conductive material 9 is a sheet-shaped heat dissipation sheet. The thermally conductive material 9 is made of a material such as a silicon-based material. The thermally conductive material 9 may be a heat dissipation grease or a heat dissipation gel.

The thermally conductive material 9 contacts the exposed portion 42a. The thermally conductive material 9 also contacts the lower surface 81b of the board body 81 of the circuit board 80. The thermally conductive material 9 transfers heat from the circuit board 80 to the fixed shaft 40.

According to this embodiment, the thermally conductive material 9 transfers heat generated in the circuit board 80 to the fixed shaft 40 via the thermally conductive material 9. The fixed shaft 40 has a sufficiently large heat capacity compared to the heating element 82 and the board body 81. In addition, the fixed shaft 40 is cooled by contacting with the water (liquid) discharged by the pump section 60. Therefore, according to this embodiment, the circuit board 80 can be effectively cooled, and the reliability of the operation of the circuit board 80 can be improved.

According to this embodiment, the circuit board 80 is cooled using a fixed shaft 40 provided inside the pump 1. This allows the entire pump 1 to be made smaller in the axial direction compared to when a heat sink is also used above the circuit board 80. In addition, compared to when a heat sink is used, the sealing structure around the heat sink can be omitted, reducing manufacturing costs.

In this embodiment, the heating element 82, the thermally conductive material 9, and the exposed portion 42a overlap each other when viewed from the axial direction. This allows the heat generated by the heating element 82 to be transferred to the exposed portion 42a of the fixed shaft 40 via the substrate body 81 and the thermally conductive material 9 in the shortest possible distance, allowing the heating element 82 to be efficiently cooled by the fixed shaft 40.

In this embodiment, the case where the heating element 82 is mounted on the upper surface 81a of the substrate main body 81 has been described. In this case, the heat of the heating element 82 is transferred to the thermal conductive material 9 via the circuit board. In contrast, as shown as a modified example in FIG. 8, the heating element 82 may be mounted on the lower surface 81b (the surface on one axial side) of the substrate main body 81. In this modified example, the thermal conductive material 109 is in direct contact with the heating element. Therefore, the heat of the heating element can be directly transferred to the thermal 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 12. The rotor 50 is rotatable about the central axis J. The rotor 50 has a rotor core 51, a magnet 52, a first covering portion 54, and a resin portion 53.

The rotor core 51 is annular and surrounds the central axis J. A fixed shaft 40 passes axially through the radially inner side of the rotor core 51. The magnets 52 are fixed to the rotor core 51. In this embodiment, the magnets 52 are 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 magnets 52 constitute a rotor assembly 55.

The resin part 53 is cylindrical and extends axially around the central axis J. The fixed shaft 40 passes axially through the radially inner side of the resin part 53. The fixed shaft 40 is inserted radially inside the resin part 53. The fixed shaft 40 supports the inner peripheral surface of the resin part 53, thereby rotatably supporting the rotor 50.

The resin part 53 has a second covering part 53a that embeds and holds the rotor assembly 55, and an extension part 53b that extends downward from the second covering part 53a. The second covering part 53a has a part that is located between the fixed shaft 40 and the rotor core 51 in the radial direction. The lower end of the extension part 53b protrudes downward beyond the rotor accommodating part 12. A retaining recess 61 is provided at the lower end of the extension part 53b. As described above, a retaining screw 69 that prevents the rotor 50 and the pump part 60 from coming off is arranged inside the retaining recess 61.

The outer peripheral surface of the resin part 53 is the outer peripheral surface of the rotor 50. The outer peripheral surface of the resin part 53 is located radially inwardly away from the inner peripheral surface of the rotor accommodating part 12. The outer peripheral surface of the second covering part 53a faces the inner peripheral surface of the rotor accommodating part 12 with a small gap therebetween.

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

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

The impeller body 62 has a base plate portion 62a, a shroud plate portion 62b, a number of blade portions 62c, and a cylindrical portion 62d.

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

The cylindrical portion 62d extends in the axial direction around the central axis J. The cylindrical portion 62d surrounds the extension portion 53b from the radially outward side. The inside of the cylindrical portion 62d is connected to the space between the base plate portion 62a and the shroud plate portion 62b. The vane portion 62c connects between the base plate portion 62a and the shroud plate portion 62b. The vane portion 62c extends in the radial direction. When the pump portion 60 rotates, the vane portions 62c send the liquid between the vane portions 62c radially outward.

The pump section 60 has an intake port 64 for drawing in water (liquid) and an exhaust port 65 for exhausting water (liquid). The intake port 64 faces downward and faces the inlet pipe 26 in the axial direction. On the other hand, the exhaust port 65 faces radially outward and faces the outlet 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 opens downward. Meanwhile, 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 portion 60 is rotated around the central axis J by the rotor 50, thereby drawing water into the interior through the suction port 64 and discharging the water from the discharge port 65, thereby delivering the water. The water delivered by the pump portion 60 also flows into the inside of the rotor accommodating portion 12.

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. 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 the stator 70 and the stator cover 90.

The stator 70 is located radially outside the rotor 50 and surrounds the rotor 50. The stator 70 is annular and surrounds the rotor accommodating section 12 and the rotor 50 radially outside the rotor accommodating 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.

The stator core 71 is located radially outside the rotor accommodating section 12 and surrounds the rotor core 51. The stator core 71 has an annular core back 71a that surrounds the rotor core 51 and a number of teeth 71b that extend radially inward from the core back 71a. Although not shown in the figure, the multiple teeth 71b are arranged side by side along the circumferential direction.

The radially inner ends of the teeth 71b face the outer circumferential surface of the cylindrical portion 12b in the rotor housing portion 12 with a small gap between them. In other words, in this embodiment, the stator 70 is arranged in a non-contact state with the outer circumferential 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. An insulator 72 is interposed between the coil 73 and the teeth 71b. An end of the coil wire 73a extends upward from the coil 73. The extending coil wire 73a is connected to the circuit board 80. The number of coils 73 provided on the stator 70 is the same as the number of teeth 71b.

As shown in FIG. 3, the insulators 72 are attached to the teeth 71b. The insulators 72 cover the outer peripheral surfaces of the teeth 71b. The insulators 72 of this embodiment can be separated in the vertical direction. The insulators 72 are assembled to the teeth 71b from the vertical direction. The insulators 72 of this embodiment are attached to each tooth 71b. The number of insulators 72 provided on the stator 70 is the same as the number of teeth 71b.

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 square tube 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 radial sides.

FIG. 7 is a perspective view of a stator assembly 75 according to the present embodiment.
3 and 7, a step portion 72a is provided on an outer surface of the outer wall portion 72b facing radially outward. The step portions 72a are provided on the upper and lower sides of the stator core 71. The step portions 72a are recessed radially inward with respect to the outer surface of the outer wall portion 72b. The step portion 72a has a step surface facing the stator core 71.

As shown in FIG. 3, two step portions 72a are provided on one insulator 72. Of the two step portions 72a, one is located on the lower side of the stator core 71, and the other is located on the upper side of the stator core 71. As shown in FIG. 7, the multiple insulators 72 are lined up in the circumferential direction. Therefore, the multiple step portions 72a are lined up at equal intervals in the circumferential direction on the upper and lower sides of the stator core 71.

As shown in FIG. 3, the stator cover 90 covers the multiple coils 73. As described above, the coils 73 are disposed between the outer wall portion 72b and the inner wall portion 72c of the insulator 72. The coils 73 are exposed on the upper and lower sides of the insulator 72. The stator cover 90 is disposed so as to straddle the outer wall portion 72b and the inner wall portion 72c of the insulator 72.

The stator cover 90 has an annular first cover body 91 that covers the coil 73 from below (one axial side), and an annular second cover body 92 that covers the coil 73 from above (the other axial side).

According to this embodiment, the stator cover 90 covers the coil 73, thereby protecting the coil 73 from the molten resin material when the resin housing 30 is molded. Generally, an insulating coating is provided on the surface of the coil wire 73a. According to this embodiment, damage to the insulating coating of the coil wire 73a caused by the heat and injection pressure of the molten resin when the resin housing 30 is molded can be suppressed.

In this embodiment, a gap G is provided between the stator cover 90 and the coil 73. In other words, according to this embodiment, an air layer is provided between the resin housing 30 and the coil 73, making it difficult for the heat of the molten resin during molding to be transmitted to the coil 73. This makes it possible to more reliably prevent damage to the insulating coating of the coil wire 73a.

Generally, the coil 73 is constructed by winding the coil wire 73a, and therefore the external shape is not stable. 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 regardless of the shape of the coil 73.

The surface of the coil 73 has a complex uneven shape because the outer shape of the coil wire 73a is exposed. Therefore, when the surface of the coil 73 is molded with a resin housing 30, it is difficult for the molten resin to get into the gaps between the coil wires 73a, and sink marks are likely to occur inside the resin housing 30. In addition, because the surface of the coil 73 has a complex uneven shape, it is difficult to control the thickness of the resin housing 30, and there is a problem that dimensional accuracy is difficult to stabilize.

According to this embodiment, the resin housing 30 does not cover the surface of the coil 73, but covers the stator cover 90. In other words, there is no need for the molded resin to cover the complex uneven shape, which suppresses sink marks in the resin housing 30 and stabilizes dimensional accuracy.

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. This allows each part of the stator 70 to be sealed from the outside. Furthermore, the stator cover 90 is firmly fixed to the stator core 71, which increases the reliability of the protection of the coil 73 by the stator cover 90.

According to this embodiment, the stator cover 90 includes a pair of cover bodies 91, 92 that respectively cover the coil 73 from the lower and upper sides. This allows the stator cover 90 to 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, 92.

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 cylinder portion 95, an inner cylinder portion 96, a plurality of locking portions 94a, and a plurality of sealing wall portions 94f. The second cover body 92 also 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 cylinder portion 95, an inner cylinder portion 96, locking portions 94a, sealing wall portions 94f, columnar portions 97, and terminal holding portions 98.

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

As shown in FIG. 4, the outer cylinder portion 95 extends from the outer edge of the annular main body portion 93 toward the stator core 71. The outer cylinder portion 95 and the inner cylinder portion 96 are each cylindrical and centered on the central axis J. Meanwhile, the inner cylinder portion 96 extends from the inner edge of the annular main body portion 93 toward the stator core 71. The outer cylinder portion 95 and the inner cylinder portion 96 of the first cover body 91 extend upward from the annular main body portion 93. The outer cylinder portion 95 and the inner cylinder portion 96 of the second cover body 92 extend downward from the annular main body portion 93. In the following description, the tip portion of the outer cylinder portion 95 or the inner cylinder portion 96 refers to the end portion on the stator core 71 side in the axial direction.

The inner cylinder portion 96 overlaps the inner wall portion 72c of the insulator 72 when viewed from the axial direction. The tip of the inner cylinder portion 96 contacts the end face of the inner wall portion 72c facing the axial direction. The inner cylinder portion 96 is located radially inside the coil 73. The inner circumferential surface of the inner cylinder portion 96 facing radially inward is continuous with the inner surface of the inner wall portion 72c facing radially inward. The inner circumferential surface of the inner cylinder portion 96 and the inner surface of the inner wall portion 72c fit into the outer circumferential surface of the cylindrical portion 12b of the rotor accommodating portion 12.

According to this embodiment, the outer peripheral surface of the tubular portion 12b of the support member 10 fits into the inner tube portion 96. The gap between the inner tube portion 96 and the tubular portion 12b is small enough that the molten resin does not pass through during molding. Therefore, when the resin housing 30 is molded, the molten resin can be prevented from flowing from the radial inside of the inner tube portion 96 into the coil 73 side (i.e., gap G). As a result, the coil 73 can be separated from the resin housing 30 and protected.

The outer cylinder portion 95 is disposed radially outside the outer wall portion 72b of the insulator 72. The outer cylinder portion 95 covers the vicinity of the upper end portion of the outer surface of the outer wall portion 72b from the radial outside. The tip portion of the outer cylinder portion 95 faces the end face of the stator core 71 via a gap.

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

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

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

According to this embodiment, the first cover body 91 and the second cover body 92 are assembled to the stator 70 from above and below. The locking portion 94a functions as a snap fit. Therefore, in the assembly process, the locking portion 94a elastically deforms radially outward until the claw portion 94aa reaches the step portion 72a. 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 radially outward.

According to this embodiment, the first cover body 91 and the second cover body 92 are engaged and fixed to the stator 70. This makes it possible to prevent the first cover body 91 and the second cover body 92 from being misaligned with respect to the stator 70 when the resin housing 30 is molded. In addition, according to this embodiment, the first cover body 91 and the second cover body 92 are fixed to the stator 70 by snap fitting, which simplifies the assembly process of the stator assembly 75.

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

The sealing wall portion 94f is a plate-like member with a thickness direction in the radial 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. As a result, the outer wall portions 72b of the multiple insulators 72 form a cylindrical shape. The sealing wall portion 94f covers the gaps between the outer wall portions 72b of the insulators 72 arranged in the circumferential direction.

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

When the resin housing 30 is molded, the first cover body 91 and the second cover body 92 are pressed against 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 to allow smooth elastic deformation when locked. In this embodiment, the tip surface of the sealing wall portion 94f facing the axial direction contacts the stator core 71. Therefore, the sealing wall portion 94f can suppress damage to the locking portions 94a by receiving the force caused by the resin pressure applied to the first cover body 91 and the second cover body 92.

The columnar portion 97 extends 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 lined up in the circumferential direction. A through hole (coil holding portion) 97h opens on the upper surface of the columnar portion 97. In other words, the through hole 97h is provided on the second cover body 92. In this embodiment, two through holes 97h open on one columnar portion 97.

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.

The 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 that holds the coil wire 73a. In other words, the stator cover 90 has a coil holding portion (through hole 97h) that holds the coil wire.

In this embodiment, holding the coil wire 73a means supporting the coil wire 73a along the axial direction to maintain the attitude and position of the coil wire 73a. The inner circumferential surface of the through hole 97h may be in close contact with the coil wire 73a. The hole diameter of the through hole 97h is preferably 1.5 times or less the wire diameter of the coil wire 73a.

In this embodiment, the coil holding portion that holds the coil 73 is a through hole 97h, so that 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 recessed radially inward from the outer periphery of the second cover body 92.

The through hole 97h is provided with a tapered portion 97t whose cross-sectional area decreases toward the upper side (the other axial side). In this 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 its entire length, including the tapered portion 97t. According to this embodiment, when the stator cover 90 is assembled, it becomes easier to guide the end of the coil wire 73a into the through hole 97h, facilitating the assembly process of the stator assembly 75.

In this embodiment, the stator cover 90 holds the coil wire 73a that is pulled out from the coil 73 through the through hole 97h and connected to the circuit board 80. This allows the stator cover 90 to position the coil wire 73a and facilitate the process of connecting the coil wire 73a to the circuit board 80.

In this embodiment, the through hole 97h connects the space inside the case 2 in which the coil 73 is housed and the space in which the circuit board 80 is housed. Therefore, when the resin housing 30 is molded, the molten resin does not come into contact with the coil wire 73a drawn from the coil 73. In other words, the stator cover 90 can protect the drawn coil wire 73a from the molten resin at the through hole 97h.

The through hole 97h in 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. In addition, 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, thereby improving the reliability of the connection between the coil wire 73a and the circuit board 80.

In this embodiment, the through hole 97h extends axially inside the columnar portion 97. The columnar portion 97 also extends axially and penetrates the resin housing 30 in the axial direction. This allows the through hole 97h to be long, which increases the reliability of the through hole 97h holding the coil wire 73a.

The upper end surface (tip surface) 97a of the columnar portion 97 is exposed above the resin housing 30. When the resin housing 30 is molded, it is covered by a mold. The upper end surface 97a of the columnar portion 97 faces the circuit board 80, and is provided with an opening for a through hole 97h. Therefore, when the resin housing 30 is molded, molten resin does not enter the inside of the through hole 97h, and the coil wire 73a can be more reliably protected.

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 from the second cover body 92, and an upper protrusion 98b extending upward from the radially outer end of the radially extending portion 98a. The terminal holding portion 98 holds multiple terminal terminals 8 embedded therein (three in this embodiment). The second cover body 92 is formed by insert molding in which the terminal terminals 8 are inserted.

The terminal 8 has a base 8c extending along the radial direction, a first end 8a extending upward from the radially inner end of the base 8c, and a second end 8b extending upward from the radially outer end of the base 8c. The base 8c extends along the radial direction inside the radially extending portion 98a of the terminal holding portion 98. The first end 8a protrudes upward from the radially extending portion 98a. The second end 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 8a of the terminal 8 passes through the inside of the resin housing 30 and protrudes upward from the housing top surface 30g. The first end 8a is inserted into the second through hole 81k of the circuit board 80 and connected to the circuit board 80 by soldering.

The second end 8b of the terminal 8 protrudes upward from the connector portion 39 of the resin housing 30. The connector portion 39 surrounds the second end 8b of the terminal 8, exposing it. The second end 8b is connected to an external device 7 that is 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 also supplies power to the coil 73 from the coil wire 73a.

According to this embodiment, the stator cover 90 has a terminal holding portion 98, so the terminal terminal 8 can be held in the stator cover 90 in advance. Therefore, when the plastic housing 30 is molded, the terminal terminal 8 can be easily embedded inside the plastic housing 30, simplifying the manufacturing process.

The pump cover 20 constitutes the lower end of the case 2. The pump cover 20 is located below (on 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 has a pump surrounding section 22, an upper end cylindrical section 21, an inlet pipe 26, and an outlet pipe 27 (see FIG. 1). The pump surrounding section 22 covers the pump section 60 from the radial outside and from below.

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 of the pump surrounding portion 22. The upper end cylindrical portion 21 is cylindrical and centered on the central axis J. The upper end cylindrical portion 21 surrounds the outer peripheral surface of the retaining cylindrical portion 31 of the resin housing 30.

As shown in FIG. 1, the inlet pipe 26 extends downward from the lower end of the pump enclosure 22. The outlet pipe 27 extends radially outward from the outer periphery of the pump enclosure 22. The inlet pipe 26 and the outlet pipe 27 are connected to the internal space of the pump enclosure 22.

The pump cover 20 is joined to the resin housing 30 and the support member 10 by welding. The joining configuration between the pump cover 20, the resin housing 30, and the support member 10 is described below. The pump cover 20 is welded to the resin housing 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 upward (the other axial side) and a sub-region 20b facing radially inward. The main region 20a is the upper end surface of the pump enclosing portion 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 perpendicularly. The main region 20a and the sub-region 20b both extend annularly in the circumferential direction around the central axis J.

The resin housing 30 has a second contact surface 30f and a fourth contact surface 30e at the lower end. The second contact surface 30f is a flat surface facing downward (the other 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 in an annular shape along the circumferential direction centered on the central axis J. The second contact surface 30f is the lower end surface of the retaining tube portion 31. On the other hand, the fourth contact surface 30e is located on the outer circumferential surface of the retaining tube portion 31. That is, the second contact surface 30f and the fourth contact surface 30e are provided on the retaining tube portion 31. The second contact surface 30f is in contact with and 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 is in contact with and welded to 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 its lower end. The third contact surface 10f is a flat surface facing downward (the other axial side). The third contact surface 10f extends in an annular shape along the circumferential direction centered on 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 is in contact with and welded to the main region of the first contact surface 20f in the vertical direction. The third contact surface 10f is disposed adjacent to the radial inner side of the second contact surface 30f. The second contact surface 30f and the third contact surface 10f are disposed on the same plane perpendicular to the central axis J.

According to this 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 area A1 and the flow path area A2 inside the case 2 can be sealed from the outside of the case 2. Furthermore, by welding the first contact surface 20f to the third contact surface 10f, the waterproof area A1 and the flow path area A2 can be sealed from each other inside the case 2. This makes it possible to seal the pump 1 without using a sealing member such as an O-ring, reducing the number of parts and manufacturing an inexpensive and highly reliable pump 1.

In addition, according to this embodiment, the resin housing 30 and the support member 10 are welded to one contact surface (first contact surface 20f) of the pump cover 20. This makes it possible to join the two members, the resin housing 30 and the support member 10, to the pump cover 20 in a single welding process, simplifying the welding process.

According to this embodiment, since the first contact surface 20f is annular, the welded portion can be arranged in an annular shape, and the inner and outer areas of the welded portion can be sealed from each other. In addition, by making the first contact surface 20f annular, it is possible to employ spin welding, in which the pump cover 20 is rotated relative to the resin housing 30 and the support member 10 to weld the contact surfaces together, thereby improving the work efficiency of the welding process.

In this embodiment, the pump cover 20, the plastic housing 30, and the support member 10 are joined by spin welding, but other welding means may be used. As an example, the pump cover 20, the plastic housing 30, and the support member 10 may be welded by ultrasonic welding, laser welding, or the like.

According to this 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 portions between the first contact surface 20f and the second contact surface 30f and the third contact surface 10f, and the welding efficiency can be improved when spin welding is employed.

As described above, the support member 10 is molded with 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 together. Therefore, a small gap is provided between the support member 10 and the resin housing 30.

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, part of the resin material melted in the welding process enters the minute gap between the support member 10 and the resin housing 30 and solidifies. This makes it possible to seal between the support member 10 and the resin housing 30, and realizes a more reliable sealing structure.

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 retaining tube 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 plastic housing 30. This makes it possible to prevent the plastic housing 30 and the support member 10 from rotating relative to each other during the welding process by spin welding.

According to this embodiment, the protrusions 11e and recesses 31e are aligned in 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 wavy manner in the circumferential direction. The resin material melted by spin welding spreads in the circumferential direction at the interface between the first contact surface 20f, the second contact surface 30f, and the third contact surface 10f 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 wavy manner in the circumferential direction, the resin material melted during spin welding can effectively penetrate into the gap and solidify, thereby realizing a highly reliable sealing structure.

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 welded surface can be secured to be large, further improving the reliability of the seal. In addition, the welded surface can be made into an intricate labyrinth structure, which increases the reliability of the seal and the rigidity of the welded portion.

In this 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 step portion 30d that is recessed downward and radially inward is provided at the lower end of the outer circumferential surface 30a of the resin housing 30. The upper end cylindrical portion 21 of the pump cover 20 is fitted into the step portion 30d.

The step portion 30d has an opposing surface 32b facing downward. That is, the resin housing 30 has the opposing surface 32b. The opposing surface 32b faces the upper end surface 21a of the upper end tubular portion 21 via a gap. According to this embodiment, by providing a gap between the opposing surface 32b and the upper end surface 21a, even if a portion of the first contact surface 20f and the second contact surface 30f melts during the welding process and the pump cover 20 and the resin housing 30 become relatively close to each other in the axial direction, interference between the opposing surface 32b and the upper end surface 21a can be suppressed.

In this embodiment, the resin housing 30, pump cover 20, and support member 10 that are welded together are preferably made of the same type of resin material. Similarly, the resin housing 30 and board cover 28 that are welded together are preferably made of the same type of resin material. By making the welded members out of the same type of resin material, strong welding can be achieved, and thermal distortion is less likely to occur even after welding, and damage to the welded parts can be suppressed.

Although various embodiments of the present invention have been described above, each configuration and their combinations in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments.

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 type of equipment. The pump may be mounted on a vehicle, for example. The pump may be a pump that pumps any type of fluid. The pump may be an oil pump that pumps oil. Note that the configurations described above in this specification may be combined as appropriate within a range that does not contradict each other.

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...protruding portion, 12...rotor accommodating portion, 12a...lid portion, 12b...cylindrical portion, 12c...retaining portion, 20...pump cover, 20a...main region, 20b...sub-region, 20f...first contact surface, 30...resin housing (motor housing), 30a...outer periphery, 30e...fourth contact surface, 30f...second contact surface, 31...retaining cylindrical portion, 31e...recess, 32a...step surface, 32b...opposing surface, 39...connector portion, 40...fixed shaft, 41...shaft main body, 42...retaining member, 42a... Exposed portion, 42f... flange portion of holding member (flange portion), 50... rotor, 60... pump portion, 64... intake port, 65... discharge port, 70... stator, 71... stator core, 72... insulator, 73... coil, 73a... coil wire, 75... stator assembly, 80... circuit board, 81... board 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... tapered portion, 98... terminal holding portion, G... gap, J... central axis line

Claims (10)

A rotor rotatable about a central axis;
a stator located radially outside the rotor and surrounding the rotor;
a pump portion connected to one axial side of the rotor;
a support member including a rotor accommodating portion located radially inside the stator and accommodating the rotor therein, and a flange portion extending radially outward from one axial end of the rotor accommodating portion ;
a motor housing that surrounds the stator, the rotor, and the rotor accommodating portion from a radially outer side;
a pump cover located on one axial side of the motor housing and the support member and covering the pump unit,
The pump cover has an annular first contact surface,
the motor housing has a second contact surface in contact with the first contact surface,
the support member has a third contact surface in contact with the first contact surface,
the first contact surface is welded to the second contact surface and to the third contact surface ;
The pump cover, the support member, and the motor housing are each a single member.
pump. the second contact surface and the third contact surface face one side in the axial direction,
the first contact surface has a main area facing the other axial direction and welded to the second contact surface and the third contact surface;
2. The pump of claim 1. The pump according to claim 2, wherein the second contact surface and the third contact surface are disposed adjacent to each other in the radial direction. the motor housing has a retaining tube portion whose inner circumferential surface is in contact with an outer circumferential surface of the flange portion at least in part,
The second contact surface is provided on the holding tube portion,
The third contact surface is provided on the flange portion.
A pump according to any one of claims 1 to 3. A plurality of protrusions are provided on an outer circumferential surface of the flange portion, the protrusions being aligned in a circumferential direction.
The pump according to claim 4 , wherein an inner circumferential surface of the retaining cylinder portion is provided with a plurality of recesses into which the respective protrusions are inserted. the support member has a positioning rib that protrudes from an end face of the flange portion facing one axial direction to one side, extends along a circumferential direction, and is fitted into the pump cover on an outer peripheral surface facing radially outward.
6. A pump according to claim 4 or 5. the motor housing has a fourth contact surface facing radially outward;
A pump according to any one of the preceding claims, wherein the first contact surface has a sub-area facing radially inwards and welded to the fourth contact surface. the motor housing has a stepped surface in contact with a surface of the flange portion facing the other axial direction,
A pump according to any one of claims 1 to 7. The pump cover has an upper end surface facing the other axial direction,
The pump according to any one of claims 1 to 8, wherein the motor housing has an opposing surface that faces the upper end surface with a gap therebetween. The pump according to any one of claims 1 to 9, wherein the first contact surface is spin welded to the second contact surface and the third contact surface.

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