pump

Abstract

A pump is provided. The pump has a rotor that is rotatable about a central axis, a stator that is located radially outward of the rotor and surrounds the rotor, a pump portion that is connected to an axial side of the rotor, a support member that has a rotor housing portion that is located radially inward of the stator and internally houses the rotor, a motor housing that surrounds the stator, the rotor, and the rotor housing portion from a radially outer side, and a pump cover that is located on an axial side of the motor housing and the support member and covers the pump portion. The pump cover has a first contact surface that is annular. The motor housing has a second contact surface that is in contact with the first contact surface. The support member has a third contact surface that is in contact with the first contact surface. The first contact surface is welded to the second contact surface and the third contact surface.

Description

Technical Field

[0001] This invention relates to pumps. Background Technology

[0002] Development is underway for an electric pump in which the motor and pump sections are pre-integrated. Patent Document 1 discloses a pump in which the motor and pump sections are integrated, and the pump is configured such that the stator is molded to ensure the stator's waterproofness.

[0003] Patent Document 1: Japanese Patent No. 4894375

[0004] In Patent Document 1, a sealing component is sandwiched between the outer shell obtained by molding the stator and the component surrounding the impeller. With this structure, there is a problem of complicated assembly process. Summary of the Invention

[0005] In view of the above circumstances, one of the objectives of this invention is to provide a pump with a highly reliable sealing structure that can be achieved with a simple manufacturing process.

[0006] One embodiment of the invention is a pump comprising: a rotor capable of rotating 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 having a rotor housing located radially inside the stator and housing the rotor internally; a motor housing surrounding the stator, the rotor, and the rotor housing from the radial outside; and a pump cover located on one axial side of the motor housing and the support member, covering the pump section. The pump cover has an annular first contact surface, and the motor housing has a second contact surface contacting the first contact surface. The support member has a third contact surface contacting the first contact surface. The first contact surface is fused to the second and third contact surfaces.

[0007] According to one aspect of the present invention, it is possible to provide a pump with a highly reliable sealing structure that can be achieved with a simple manufacturing process. Attached Figure Description

[0008] Figure 1 This is a perspective view of a pump implemented in one way.

[0009] Figure 2 This is a cross-sectional view of a pump according to one embodiment.

[0010] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0011] Figure 4 yes Figure 2 A magnified view of a portion of the image.

[0012] Figure 5 yes Figure 2 A magnified view of a portion of the image.

[0013] Figure 6 yes Figure 2 A magnified view of a portion of the image.

[0014] Figure 7 This is a perspective view of a stator assembly according to one implementation method.

[0015] Figure 8 This is a partial sectional view of a modified pump.

[0016] Label Explanation

[0017] 1: Pump; 3: Motor; 7: External device; 8: Terminal block; 8a: First end; 8b: Second end; 9, 109: Thermal conductive material; 10: Support component; 10f: Third contact surface; 11: Flange; 11d: Positioning rib; 11e: Protrusion; 12: Rotor housing; 12a: Cover; 12b: Cylindrical part; 12c: Holding part; 20: Pump cover; 20a: Main area; 20b: Secondary area; 20f: First contact surface; 30: Resin housing (motor housing); 30a: Outer peripheral surface; 30e: Fourth contact surface; 30f: Second contact surface; 31: Holding cylinder; 31e: Recess; 32a: Stepped surface; 32b: Opposing surface; 39: Connector part; 40: Fixed shaft; 41: Shaft body part; 42: Holding part Holding component; 42a: Exposed part; 42f: Holding component flange; 50: Rotor; 60: Pump part; 64: Inlet; 65: Outlet; 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; 82: Heating element; 90: Stator cover; 91: First cover body; 92: Second cover body; 94aa: Claw part; 94f: Sealing wall part; 96: Inner cylinder part; 97: Columnar part; 97a: Upper end face; 97h: Through hole (coil holding part); 97t: Tapered part; 98: Terminal holding part; G: Gap; J: Central axis. Detailed Implementation

[0018] In each figure, the central axis J of the pump 1 in the embodiment described below is hypothetically shown. In the following description, the axial direction of the central axis J is simply referred to as "axial direction". The radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction centered on the central axis J is simply referred to as "circumferential direction". 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 where the arrow of the Z-axis points (+Z side) is called the "upper side", and the side in the axial direction opposite to the side in the Z-axis direction (-Z side) is called the "lower side".

[0019] In this embodiment, the lower side corresponds to "one side of the axial direction" and the upper side corresponds to "the other side of the axial direction". In addition, the upper side and the lower side are just names used to describe the relative positional relationship of each part. The actual configuration relationship may be a configuration relationship other than that represented by these names.

[0020] Figure 1 This is a 3D view of pump 1. Figure 2 This is a cross-sectional view of pump 1. Figure 3 , Figure 4 , Figure 5 as well as Figure 6 They are respectively to Figure 2 A magnified portion of the image. Additionally, in Figure 2 For illustration, cross-sections at different circumferential positions on the left and right sides of the central axis J are shown.

[0021] like Figure 2 As shown, 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 housing 2. The motor 3 includes a rotor 50, which is capable of rotating about a central axis J; and a stator assembly 75, which is located radially outside the rotor 50 and surrounds the rotor 50. That is, the pump 1 includes a rotor 50 and a stator assembly 75.

[0022] In this embodiment, pump 1 is a water pump for conveying water. Pump 1 uses motor 3 to rotate pump section 60, drawing water (liquid) from inlet pipe 26 and pumping it out through outlet pipe 27 (see reference). Figure 1 )discharge.

[0023] like Figure 2 As shown, housing 2 houses motor 3, pump unit 60, support member 10, fixed shaft 40, and circuit board 80. The interior of housing 2 is divided into a flow path area A2 for water (liquid) passage and a water-sealed waterproof area A1. Rotor 50, fixed shaft 40, and pump unit 60 are arranged in flow path area A2. Stator assembly 75 and circuit board 80 are arranged in waterproof area A1. Flow path area A2 and waterproof area A1 are separated by support member 10.

[0024] The housing 2 includes a resin outer shell (motor housing) 30, a substrate cover 28, and a pump cover 20. That is, the pump 1 includes the resin outer shell 30, the substrate cover 28, and the pump cover 20. The substrate cover 28 is joined to the upper end of the resin outer shell 30. Conversely, the pump cover 20 is joined to the lower end of the resin outer shell 30. Thus, the resin outer shell 30, the substrate cover 28, and the pump cover 20 are mutually fixed.

[0025] The resin housing 30 has an embedded portion 32 into which the stator assembly 75 and the support member 10 are molded and embedded. That is, the resin housing 30 is formed by molding an insert into which the stator assembly 75 and the support member 10 are embedded. Thus, 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.

[0026] like Figure 1 As shown, when viewed axially, the outer peripheral surface 30a of the resin housing 30 is circular. A connector portion 39 is provided on the outer peripheral surface 30a of the resin housing 30. That is, the resin housing 30 has a connector portion 39. The connector portion 39 protects the wiring terminal 8 that is connected to the external device 7.

[0027] like Figure 2 As shown, the upper end of the resin housing 30 has an upper surface 30g facing upwards and a surrounding cylindrical portion 38 extending upwards from the outer edge of the upper surface 30g. On the other hand, the lower end of the resin housing 30 has a cylindrical retaining portion 31 centered on the central axis J. The resin housing 30 is engaged with the substrate cover 28 at the surrounding cylindrical portion 38 and with the pump cover 20 at the retaining portion 31.

[0028] The upper surface 30g of the outer casing faces the circuit board 80 in the vertical direction. A boss supporting the circuit board 80 from below is provided on the upper surface 30g of the outer casing. The surrounding cylindrical portion 38 is cylindrical about the central axis J. The surrounding cylindrical portion 38 surrounds the circuit board 80 radially outward.

[0029] The substrate cover 28 has a plate-shaped cover body 28a extending along a plane perpendicular to the central axis J, and guide ribs 28b disposed on the lower surface of the cover body 28a. The cover body 28a is circular about the central axis J. The outer diameter of the cover body 28a is approximately the same as the outer diameter of the resin housing 30. The guide ribs 28b extend circumferentially. The guide ribs 28b are positioned slightly radially inward than the outer edge of the cover body 28a. The outer peripheral surface of the guide ribs 28b is embedded in the inner peripheral surface of the surrounding cylindrical portion 38 of the resin housing 30. Thus, the substrate cover 28 is positioned relative to the resin housing 30.

[0030] The area on the lower surface of the cover body 28a, located radially outward from the guide rib 28b, contacts the upper end face of the surrounding cylindrical portion 38 of the resin shell 30. The lower surface of the cover body 28a and the upper end face of the surrounding cylindrical portion 38 are fused together.

[0031] In the welding process, the substrate cover 28 is pressed against the lower surface of the resin shell 30 while rotating. During the welding process, frictional heat is used to melt and solidify the contact area between the substrate cover 28 and the resin shell 30 to achieve bonding. That is, the substrate cover 28 and the resin shell 30 are joined by rotational welding. Alternatively, the substrate cover 28 and the resin shell 30 can also be welded together using other welding methods such as ultrasonic welding or laser welding.

[0032] The circuit board 80 is disposed on the upper side (the other side of the axial direction) of the stator assembly 75. That is, the circuit board 80 is disposed on the upper side of the stator 70. The circuit board 80 is housed in a space surrounded by the radially inner side of the surrounding cylindrical portion 38 of the resin housing 30, the upper surface 30g of the housing, and the board cover 28.

[0033] The circuit board 80 includes: a substrate body 81, which is plate-shaped along a plane perpendicular to the central axis J; and a heating element 82, which is mounted on the upper surface 81a (the surface on the other side of the axial direction) of the substrate body 81. In addition to the heating element 82, the circuit board 80 also has a plurality of components mounted on the upper surface 81a or the lower surface 81b of the substrate body 81 (not shown).

[0034] The substrate body 81 has a first through hole 81h and a second through hole 81k extending along the thickness direction. That is, the circuit board 80 has 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 the coil wire 73a is connected to the substrate body 81 by solder. A first end 8a of a terminal 8 is inserted into the second through hole 81k, and the first end 8a is connected to the substrate body 81 by solder. Multiple first through holes 81h and second through holes 81k are provided on the substrate body 81.

[0035] The heating element 82 is disposed on the central axis J. The heating element 82 refers to the element that generates heat and becomes high temperature during operation among the elements mounted on the substrate body 81. When the circuit board 80 has multiple elements, the heating element 82 generates more heat than other elements. Examples of heating elements 82 include switching elements, capacitors, field-effect transistors, driver integrated circuits for driving field-effect transistors, and power supply integrated circuits.

[0036] The support member (shielding member) 10 is non-magnetic. 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.

[0037] The rotor housing 12 is located radially inside the stator assembly 75. That is, the rotor housing 12 is located radially inside the stator 70. The rotor housing 12 is cylindrical, surrounding the central axis J and opening at the bottom. The rotor housing 12 houses the rotor 50 internally. The rotor housing 12 has a cover 12a that covers the rotor 50 from the top and a cylindrical portion 12b that extends downward from the cover 12a.

[0038] The cover portion 12a is in the shape of a circular plate centered on the central axis J. The cover portion 12a covers the rotor 50 from the upper side (the other side of the axial direction). When viewed from the axial direction, a retaining portion 12c is provided in the center of the cover portion 12a. The retaining portion 12c is the part that retains the upper end of the fixed shaft 40. The retaining portion 12c protrudes downward from the other parts of the cover portion 12a.

[0039] The cylindrical portion 12b extends downward from the radially outer periphery of the cover portion 12a and connects to the radially inner periphery of the flange portion 11. The cylindrical portion 12b is located radially between the rotor 50 and the stator assembly 75. That is, the cylindrical portion 12b is located radially between the rotor 50 and the stator 70. The cylindrical portion 12b has an opening on its lower side.

[0040] According to this embodiment, the rotor housing 12 internally houses the rotor 50. Furthermore, the rotor housing 12 has a cover 12a that covers the rotor 50 from above and a cylindrical portion 12b that surrounds the rotor 50 and opens at the bottom. Thus, the rotor housing 12 can ensure a structure that connects the pump unit 60 to the bottom of the rotor 50 while simultaneously sealing the rotor 50 from the stator 70, preventing the liquid (water) pumped by the pump unit 60 from contacting the stator 70.

[0041] The flange portion 11 is annular in shape surrounding the central axis J. The flange portion 11 extends radially outward from the lower end (axial side) of the rotor housing portion 12. The flange portion 11 is located on the lower side of the stator 70. The lower-facing surface of the flange portion 11 (the third contact surface 10f described later) is fused to the pump cover 20.

[0042] The outer peripheral surface of the flange portion 11 is covered by the retaining sleeve portion 31 of the resin housing 30. That is, at least a portion of the inner peripheral surface of the retaining sleeve portion 31 contacts the outer peripheral surface of the flange portion 11. In this embodiment, the support member 10 is embedded in the resin housing 30 together with the stator assembly 75.

[0043] A portion of the flange portion 11 is embedded in a resin housing 30 on its upper surface and outer peripheral surface, and protrudes from the resin housing 30 on its lower surface. The portion of the resin housing 30 into which the flange portion 11 is embedded has a stepped surface 32a. That is, the resin housing 30 has a stepped surface 32a that contacts the upper surface of the flange portion 11 (the surface facing the opposite axial direction). The resin housing 30 axially supports the flange portion 11 at the stepped surface 32a.

[0044] like Figure 1 As shown, a plurality of protrusions 11e arranged circumferentially are provided on the outer peripheral surface of the flange portion 11. A plurality of recesses 31e are provided on the inner peripheral surface of the retaining cylinder portion 31 for the protrusions 11e to be inserted into. The recesses 31e are formed by filling the protrusions 11e into each other by surrounding the outer peripheral surface of the flange portion with molten resin during the molding of the resin shell 30. Therefore, the protrusions 11e and the recesses 31e are in close contact with each other.

[0045] A positioning rib 11d is provided on the lower surface (the side facing the axial direction) of the flange portion 11. The positioning rib 11d protrudes downward from the lower surface of the flange portion 11. The positioning rib 11d extends circumferentially with the central axis J as the center. The outer circumferential surface of the positioning rib 11d facing radially outward is embedded in the inner circumferential surface of the pump cover 20. The positioning rib 11d enables the pump cover 20 and the support member 10 to be axially aligned relative to each other. Alternatively, a small gap may be provided between the outer circumferential surface of the positioning rib 11d and the inner circumferential surface of the pump cover 20. In this case, the pump cover 20 and the support member 10 are axially aligned within the allowable gap range of assembly error.

[0046] like Figure 2 As shown, the fixed shaft 40 extends axially. The fixed shaft 40 has a cylindrical shaft body portion 41 extending axially about a central axis J, and a retaining member 42 disposed on the other axial side of the shaft body portion 41. The shaft body portion 41 and the retaining member 42 are made of a metal material with excellent thermal conductivity.

[0047] A threaded hole 41h is provided on the lower end face of the shaft body 41. The threaded hole 41h extends axially with the central axis J as the center. An anti-disengagement screw 69 is inserted into the threaded hole 41h. The anti-disengagement screw 69 prevents the pump part 60 from disengaging to the downward side.

[0048] An anti-detachment recess 61 is provided in the center of the pump section 60. The anti-detachment recess 61 opens downwards. The anti-detachment recess 61 has an anti-detachment surface 61p facing downwards as its bottom surface. The aforementioned anti-detachment screw 69 is disposed inside the anti-detachment recess 61. The seat surface of the head of the anti-detachment screw 69 is axially opposed to the anti-detachment surface 61p of the anti-detachment recess 61 of the pump section 60 through a washer 68.

[0049] The lower end face of the shaft body 41, the anti-loosening 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 anti-loosening screw 69, and the washer 68 come into contact with the water (liquid) flowing into the pump section 60 and are cooled by the water. Therefore, the heat transferred from the circuit board 80 to the fixed shaft 40 can be released into the water, thereby effectively cooling the circuit board 80.

[0050] like Figure 5 As shown, the retaining member 42 is disposed on the upper side (the other side of the axial direction) of the shaft body portion 41. The retaining member 42 has a retaining member body 42b and a retaining member flange portion (flange portion) 42f extending radially outward from the retaining member body 42b. A retaining hole portion 42h with an opening on the lower side is provided in the retaining member body 42b. The upper end portion of the shaft body portion 41 is fitted into the retaining hole portion 42h. Thus, the shaft body portion 41 is fixed to the retaining member 42.

[0051] According to this embodiment, the fixed shaft 40 has a shaft body portion 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 portion 41 and the retaining member 42, which are manufactured separately, and the fixed shaft 40 can be manufactured inexpensively.

[0052] The retaining member 42 is embedded into the cover portion 12a of the supporting member 10 by insert molding. More specifically, the retaining member flange portion 42f of the retaining member 42 is embedded into the retaining portion 12c of the cover portion 12a. Thus, the fixing shaft 40 is supported by the cover portion 12a. According to this embodiment, by embedding the retaining member flange portion 42f into the retaining portion 12c, the retaining member flange portion 42f hooks onto the retaining portion 12c with a larger area in the axial direction. Therefore, it is possible to prevent the retaining member flange portion 42f from falling downward from the retaining portion 12c.

[0053] The retaining member flange 42f extends radially outward relative to the shaft body 41. The retaining member flange 42f undergoes surface treatment to improve its adhesion to the resin material constituting the retaining portion 12c. This suppresses moisture infiltration into the interface between the retaining member 42 and the retaining portion 12c. Therefore, moisture will not reach the upper side of the cover 12a from the interior of the rotor housing 12.

[0054] The retaining member 42 has an exposed portion 42a that protrudes upward (to the other side of the axial direction) relative to the cover portion 12a. That is, the fixing shaft 40 has an exposed portion 42a. The exposed portion 42a extends along a plane perpendicular to the central axis J, which is the upper surface of the retaining member body 42b. The exposed portion 42a is opposite to the circuit board 80 located above the cover portion 12a.

[0055] A 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-like heat sink. Silicon-based materials or the like are used as the material of the thermally conductive material 9. Alternatively, the thermally conductive material 9 can also be thermal grease or thermal gel.

[0056] The thermally conductive material 9 contacts the exposed portion 42a. Additionally, the thermally conductive material 9 contacts the lower surface 81b of the substrate body 81 of the circuit board 80. The thermally conductive material 9 causes the heat of the circuit board 80 to move towards the fixed axis 40.

[0057] According to this embodiment, the heat generated by the circuit board 80 is transferred to the fixed shaft 40 via the thermally conductive material 9. The heat capacity of the fixed shaft 40 is sufficiently large compared to the heating element 82 and the substrate body 81. Furthermore, the fixed shaft 40 is cooled by contact with water (liquid) discharged from the pump section 60. Therefore, according to this embodiment, the circuit board 80 can be effectively cooled, improving the reliability of the circuit board 80's operation.

[0058] According to this embodiment, a fixed shaft 40 disposed inside the pump 1 is used to cool the circuit board 80. Therefore, compared to the case where a heat sink is also used on the upper side of the circuit board 80, the pump 1 as a whole can be miniaturized in the axial direction. In addition, compared to the case where a heat sink is used, the sealing structure around the heat sink can be omitted, thereby reducing manufacturing costs.

[0059] In this embodiment, when viewed from the axial direction, the heating element 82, the thermally conductive material 9, and the exposed portion 42a overlap each other. Therefore, the heat generated by the heating element 82 can be transferred to the exposed portion 42a of the fixed shaft 40 with the shortest distance via the substrate body 81 and the thermally conductive material 9, and the heating element 82 can be effectively cooled by the fixed shaft 40.

[0060] In this embodiment, the case where the heating element 82 is mounted on the upper surface 81a of the substrate body 81 is described. In this case, the heat from the heating element 82 is transferred to the heat-conducting material 9 via the circuit board. Alternatively, it can be as follows... Figure 8 As shown in the modified example, the heating element 82 is mounted on the lower surface 81b (the surface on one axial side) of the substrate body 81. In this modified example, the thermally conductive material 109 is in direct contact with the heating element. Therefore, the heat from the heating element can be directly transferred to the thermally conductive material 109, thereby improving the cooling efficiency of the heating element 82.

[0061] like Figure 2 As shown, the rotor 50 is housed inside the rotor housing 12. The rotor 50 is capable of rotating about the central axis J. The rotor 50 has a rotor core 51, a magnet 52, a first covering part 54, and a resin part 53.

[0062] The rotor core 51 is annular, surrounding the central axis J. A fixed shaft 40 is axially inserted into the radially inner side of the rotor core 51. 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, multiple magnets 52 are arranged at intervals in the circumferential direction. A first covering portion 54 fixes the rotor core 51 and the multiple magnets 52 to each other. The first covering portion 54, the rotor core 51, and the magnets 52 constitute the rotor assembly 55.

[0063] The resin section 53 is cylindrical, surrounding the central axis J and extending axially. A fixed shaft 40 is inserted axially into the radially inner side of the resin section 53. The fixed shaft 40 supports the rotor 50 for rotation by supporting the inner circumferential surface of the resin section 53.

[0064] The resin portion 53 has a second covering portion 53a for embedding and holding the rotor assembly 55, and an extension portion 53b extending downward from the second covering portion 53a. The second covering portion 53a has a portion located radially between the fixed shaft 40 and the rotor core 51. The lower end of the extension portion 53b protrudes downward beyond the rotor housing portion 12. An anti-detachment recess 61 is provided at the lower end of the extension portion 53b. As described above, an anti-detachment screw 69 is disposed inside the anti-detachment recess 61 to prevent the rotor 50 and the pump portion 60 from separating.

[0065] 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 inward from the inner peripheral surface of the rotor housing part 12. The outer peripheral surface of the second covering part 53a faces the inner peripheral surface of the rotor housing part 12 with a small gap between them.

[0066] The pump section 60 is connected to the lower side (axial side) of the rotor 50. In this embodiment, the pump section 60 is an impeller. The pump section 60 is made of resin.

[0067] The pump section 60 has an impeller body section 62 connected to the lower end of the extension 53b of the rotor 50. The resin section 53 and the impeller body section 62 are part of the same single component. The resin part including the resin section 53 and the impeller body section 62 is manufactured, for example, by insert molding of the rotor assembly 55 as an insert component.

[0068] The impeller body 62 has a base plate 62a, a protective plate 62b, multiple blades 62c, and a cylindrical part 62d.

[0069] Viewed axially, the base plate portion 62a and the cover plate portion 62b are circular. The base plate portion 62a extends radially outward from the outer peripheral surface of the extension portion 53b. The cover plate portion 62b extends radially outward along the plate surface of the base plate portion 62a below it.

[0070] The cylindrical portion 62d extends axially around the central axis J. The cylindrical portion 62d surrounds the extension portion 53b radially outward. The interior of the cylindrical portion 62d is connected to the space between the base plate portion 62a and the protective plate portion 62b. The blade portion 62c connects the base plate portion 62a and the protective plate portion 62b. The blade portion 62c extends radially. By rotating the pump portion 60, the multiple blade portions 62c convey the liquid between them radially outward.

[0071] The pump section 60 has an inlet 64 for drawing in water (liquid) and an outlet 65 for discharging water (liquid). The inlet 64 faces downward and is axially opposed to the inflow pipe 26. On the other hand, the outlet 65 faces radially outward and is radially opposed to the outlet pipe 27 (see reference). Figure 1 Opposite.

[0072] A suction port 64 is located at the lower end of the cylindrical portion 62d. The suction port 64 opens at the lower side. On the other hand, a discharge port 65 is axially located between the base plate portion 62a and the protective cover portion 62b. The discharge port 65 opens radially outward. The pump portion 60 rotates about the central axis J via the rotor 50, thereby drawing water in through the suction port 64 and discharging water through the discharge port 65. The water transported by the pump portion 60 also flows into the inner side of the rotor housing portion 12.

[0073] like Figure 3 As shown, the stator assembly 75 has an annular stator core 71, a plurality of coils 73 mounted on the stator core 71, a plurality of insulating members 72 between the stator core 71 and the plurality of coils 73, and a stator cover 90. Furthermore, the stator core 71, the plurality of coils 73, and the plurality of insulating members 72 constitute the stator 70. That is, the stator assembly 75 has a stator 70 and a stator cover 90.

[0074] The stator 70 is located radially outside the rotor 50 and surrounds the rotor 50. The stator 70 is annular, surrounding the rotor housing 12 and the rotor 50 radially outside the rotor housing 12. The stator 70 has: a stator core 71; an insulator 72 mounted on the stator core 71; and a plurality of coils 73 mounted on the stator core 71 through the insulator 72.

[0075] The stator core 71 is located radially outside the rotor housing 12 and surrounds the rotor core 51. The stator core 71 has an annular core back 71a surrounding the rotor core 51 and a plurality of teeth 71b extending radially inward from the core back 71a. Although not shown in the figure, the plurality of teeth 71b are arranged circumferentially.

[0076] The radially inner ends of the plurality of teeth 71b are positioned opposite the outer peripheral surface of the cylindrical portion 12b in the rotor housing 12 with a small gap between them. That is, in this embodiment, the stator 70 is configured in a state where it does not contact the outer peripheral surface of the cylindrical portion 12b.

[0077] like Figure 4 As shown, coil 73 is constructed by winding coil wire 73a around tooth 71b. An insulating member 72 is sandwiched between coil 73 and tooth 71b. The end of coil wire 73a extends upward from coil 73. The extended coil wire 73a is connected to circuit board 80. The number of coils 73 provided on stator 70 is the same as the number of teeth 71b.

[0078] like Figure 3 As shown, the insulating member 72 is mounted on the tooth 71b. The insulating member 72 covers the outer peripheral surface of the tooth 71b. In this embodiment, the insulating member 72 can be divided in the vertical direction. The insulating member 72 is assembled relative to the tooth 71b in the vertical direction. In this embodiment, the insulating member 72 is mounted on each tooth 71b. The number of insulating members 72 provided on the stator 70 is the same as the number of teeth 71b.

[0079] The insulating member 72 has a surrounding portion 72d disposed between the coil 73 and the tooth 71b, an outer wall portion 72b located radially outward of the coil 73, and an inner wall portion 72c located radially inward of the coil 73. The surrounding portion 72d is in the shape of a square tube covering the outer peripheral surface of the tooth 71b. The outer wall portion 72b and the inner wall portion 72c clamp the coil 73 from both radial sides.

[0080] Figure 7 This is a perspective view of the stator assembly 75 of this embodiment.

[0081] like Figure 3 and Figure 7 As shown, a stepped portion 72a is provided on the outer surface of the outer wall portion 72b facing radially outward. The stepped portion 72a is provided on the upper and lower sides of the stator core 71. The stepped portion 72a is recessed radially inward relative to the outer surface of the outer wall portion 72b. The stepped portion 72a has a stepped surface facing the stator core 71.

[0082] like Figure 3 As shown, two stepped portions 72a are provided on one insulating member 72. One of the two stepped portions 72a 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. Figure 7 As shown, multiple insulating elements 72 are arranged circumferentially. Therefore, multiple stepped portions 72a are arranged at equal intervals circumferentially on the upper and lower sides of the stator core 71.

[0083] like Figure 3As shown, the stator cover 90 covers a plurality of coils 73. As described above, the coils 73 are disposed between the outer wall portion 72b and the inner wall portion 72c of the insulating member 72. In addition, the coils 73 are exposed above and below the insulating member 72. The stator cover 90 is configured to span between the outer wall portion 72b and the inner wall portion 72c of the insulating member 72.

[0084] The stator cover 90 has an annular first cover 91 that covers the coil 73 from the lower side (one axial side) and an annular second cover 92 that covers the coil 73 from the upper side (the other axial side).

[0085] According to this embodiment, by covering the coil 73 with the stator cover 90, the coil 73 can be protected from the influence of 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 this embodiment, the heat of the molten resin and the injection pressure during the molding of the resin housing 30 can suppress damage to the insulating film of the coil wire 73a.

[0086] In this embodiment, a gap G is provided between the stator cover 90 and the coil 73. That is, according to this embodiment, an air layer is provided between the resin shell 30 and the coil 73, so that the heat of the molten resin during molding is not easily transferred to the coil 73. As a result, damage to the insulating coating of the coil wire 73a can be suppressed more reliably.

[0087] Generally, the coil 73 is formed by winding the coil wire 73a, so its shape is difficult to stabilize. According to this embodiment, by providing a gap G between the stator cover 90 and the coil 73, the stator cover 90 can be assembled onto the stator 70 regardless of the shape of the coil 73.

[0088] Because the coil wires 73a are exposed, the surface of the coil 73 has a complex uneven shape. Therefore, when molding the surface of the coil 73 using the resin shell 30, the molten resin has difficulty spreading into the gaps between the coil wires 73a, and shrinkage easily occurs inside the resin shell 30. Furthermore, due to the complex uneven shape of the coil 73's surface, controlling the wall thickness of the resin shell 30 becomes difficult, resulting in inconsistent dimensional accuracy.

[0089] According to this embodiment, the resin shell 30 does not cover the surface of the coil 73, but covers the stator cover 90. That is, it is not necessary to mold the resin to cover a complex concave-convex shape, which can suppress the shrinkage of the resin shell 30 and make the dimensional accuracy stable.

[0090] According to this embodiment, during the molding of the resin housing 30, molten resin material covers the surfaces of the stator cover 90 and the stator core 71. This allows for external sealing of all parts of the stator 70. Furthermore, the stator cover 90 is securely fixed to the stator core 71, improving the reliability of the stator cover 90's protection of the coil 73.

[0091] According to this embodiment, the stator cover 90 has a pair of covers 91 and 92 that cover the coil 73 from the bottom and top sides, 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 the top and bottom directions using the pair of covers 91 and 92.

[0092] like Figure 7 As shown, the first cover 91 and the second cover 92 each have an annular main body portion 93, an outer cylinder portion 95, an inner cylinder portion 96, multiple locking portions 94a, and multiple sealing wall portions 94f. Additionally, the second cover 92 also has multiple columnar portions 97 and terminal holding portions 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.

[0093] The annular main body 93 is annular with the central axis J as its center. The annular main body 93 has multiple weight-reducing parts 93a. The weight-reducing parts 93a are open on the surface of the annular main body 93 facing the side opposite to the stator core 71. The annular main body 93 of the first cover 91 is located below the coil 73, and the annular main body 93 of the second cover 92 is located above the coil 73.

[0094] like Figure 4 As shown, the outer cylinder portion 95 extends from the outer edge of the annular main body portion 93 toward the stator core 71. Both the outer cylinder portion 95 and the inner cylinder portion 96 are cylindrical with their central axis J as the center. Conversely, 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 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 92 extend downward from the annular main body portion 93. In the following description, the front end of the outer cylinder portion 95 or the inner cylinder portion 96 refers to the end on the axial side of the stator core 71.

[0095] When viewed axially, the inner cylinder portion 96 overlaps with the inner wall portion 72c of the insulating member 72. The front end of the inner cylinder portion 96 contacts the axially facing end face of the inner wall portion 72c. The inner cylinder portion 96 is located radially inside the coil 73. The radially inward-facing inner circumferential surface of the inner cylinder portion 96 is connected to the radially inward-facing inner surface of the inner wall portion 72c. The inner circumferential surface of the inner cylinder portion 96 and the inner surface of the inner wall portion 72c are embedded in the outer circumferential surface of the cylindrical portion 12b of the rotor housing portion 12.

[0096] According to this embodiment, the outer peripheral surface of the cylindrical portion 12b of the support member 10 is embedded in the inner cylindrical portion 96. The gap between the inner cylindrical portion 96 and the cylindrical portion 12b is small enough that molten resin cannot pass through during molding. Therefore, during the molding of the resin shell 30, it is possible to suppress the flow of molten resin from the radially inner side of the inner cylindrical portion 96 into the coil 73 side (i.e., gap G). As a result, the coil 73 can be separated from the resin shell 30, thereby protecting the coil 73.

[0097] The outer cylinder portion 95 is disposed radially outside the outer wall portion 72b of the insulating member 72. The outer cylinder portion 95 covers the vicinity of the upper end of the outer side surface of the outer wall portion 72b from the radial outside. The front end of the outer cylinder portion 95 is positioned opposite the end face of the stator core 71 with a gap between them.

[0098] like Figure 3 As shown, the locking part 94a extends from the front end of the outer cylinder 95 toward the stator core 71. The locking part 94a of the first cover 91 extends upward from the upper end of the outer cylinder 95. The locking part 94a of the second cover 92 extends downward from the lower end of the outer cylinder 95.

[0099] The locking portion 94a extends along the outer wall portion 72b of the insulating member 72. A claw portion 94aa is provided at the front end of the locking portion 94a. The claw portion 94aa is locked to the stepped portion 72a provided on the outer side of the outer wall portion 72b. That is, the covers 91 and 92 have a plurality of claw portions 94aa extending toward the stator core 71 and locked to the insulating member 72.

[0100] like Figure 7 As shown, the locking portions 94a are arranged at equal intervals along the circumference. In this embodiment, the first cover 91 and the second cover 92 are each provided with the same number of locking portions 94a as the insulating member 72. Each locking portion 94a is locked to a stepped portion 72a provided on the insulating member 72.

[0101] According to this embodiment, the first cover 91 and the second cover 92 are assembled vertically relative to the stator 70. The locking part 94a functions as a snap-fit ​​part. Therefore, during the assembly process, the locking part 94a elastically deforms radially outward until the claw part 94aa reaches the step part 72a. A reinforcing rib 94ab is provided on the outer surface of the locking part 94a. The reinforcing rib 94ab strengthens the locking part 94a while ensuring the elastic modulus of the locking part 94a radially outward.

[0102] According to this embodiment, the first cover 91 and the second cover 92 are locked to the stator 70 and thus fixed. Therefore, during the molding of the resin housing 30, misalignment of the first cover 91 and the second cover 92 relative to the stator 70 can be suppressed. Furthermore, according to this embodiment, the first cover 91 and the second cover 92 are fixed to the stator 70 via a snap-fit ​​connection, thereby simplifying the assembly process of the stator assembly 75.

[0103] The sealing wall portion 94f extends from the front end of the outer cylinder portion 95 toward the stator core 71. The sealing wall portion 94f of the first cover 91 extends upward from the upper end of the outer cylinder portion 95. The sealing wall portion 94f of the second cover 92 extends downward from the lower end of the outer cylinder portion 95.

[0104] The sealing wall portion 94f is plate-shaped with its thickness in the radial direction. The sealing wall portion 94f is disposed between adjacent locking portions 94a in the circumferential direction. That is, the sealing wall portion 94f is disposed between claw portions 94aa in the circumferential direction. As described above, the insulating members 72 are arranged circumferentially. When viewed axially, the outer wall portion 72b of one insulating member 72 extends in an arc shape along the circumferential direction. The outer wall portions 72b of the circumferentially arranged insulating members 72 are connected in the circumferential direction. Thus, the outer wall portions 72b of the plurality of insulating members 72 constitute a cylindrical shape. The sealing wall portion 94f covers the gap between the outer wall portions 72b of the circumferentially arranged insulating members 72.

[0105] According to this embodiment, the sealing wall portion 94f covers the space between adjacent insulating members 72 in the circumferential direction from the radially outer side. Therefore, during the molding of the resin housing 30, it is possible to prevent molten resin from flowing into the coil 73 side (i.e., gap G) from the gap between the insulating members 72. As a result, the coil 73 can be separated from the resin housing 30, thereby protecting the coil 73.

[0106] During the molding of the resin housing 30, the first cover 91 and the second cover 92 are pressed against the stator core 71 side using the resin pressure of the molten resin. The locking portions 94a of the first cover 91 and the second cover 92 have low strength in order to allow for smooth elastic deformation during locking. In this embodiment, the axially facing front end face of the sealing wall portion 94f contacts the stator core 71. Therefore, the sealing wall portion 94f is subjected to the force caused by the resin pressure applied to the first cover 91 and the second cover 92, which can suppress damage to the locking portions 94a.

[0107] A columnar portion 97 extends upward from the upper surface of the annular main body portion 93 of the second cover 92. Three columnar portions 97 are provided on the second cover 92. The three columnar portions 97 are arranged circumferentially. A through hole (coil holding portion) 97h is opened on the upper surface of the columnar portion 97. That is, the through hole 97h is provided in the second cover 92. In this embodiment, two through holes 97h are opened in one columnar portion 97.

[0108] like Figure 4 As shown, the through hole 97h extends in a straight line along the axial direction. The through hole 97h extends in the second cover 92 in a manner that crosses the annular main body 93 and the columnar part 97.

[0109] A coil wire 73a extending upward from the coil 73 is inserted through the through hole 97h. The through hole 97h functions as a coil holding part to hold the coil wire 73a. That is, the stator cover 90 has a coil holding part (through hole 97h) to hold the coil wire.

[0110] In this embodiment, maintaining the coil wire 73a means supporting the coil wire 73a along the axial direction to maintain its posture and position. The inner circumferential surface of the through hole 97h can also be in close contact with the coil wire 73a. The diameter of the through hole 97h is preferably 1.5 times or less the diameter of the coil wire 73a.

[0111] Furthermore, in this embodiment, since the coil holding portion of the coil 73 is a through hole 97h, it can surround the entire outer periphery of the coil wire 73a, thus stably holding the coil wire 73a. However, the coil holding portion may also be a notch or the like, provided in a way that recesses radially inward from the outer periphery of the second cover 92.

[0112] A tapered portion 97t is provided in the through hole 97h, the cross-sectional area of ​​which decreases as it faces upward (to the other side of the axial direction). 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 along its entire length including the tapered portion 97t. According to this embodiment, when assembling the stator cover 90, the end of the coil wire 73a can be easily guided into the interior of the through hole 97h, and the assembly process of the stator assembly 75 can be easily performed.

[0113] In this embodiment, the stator cover 90 holds the coil wire 73a, which is led out from the coil 73 and connected to the circuit board 80, in the through hole 97h. As a result, the stator cover 90 can position the coil wire 73a, making the connection process of the coil wire 73a relative to the circuit board 80 easier.

[0114] In this embodiment, the through-hole 97h connects the space inside the housing 2 that houses the coil 73 with the space that houses the circuit board 80. Therefore, during the molding of the resin housing 30, the molten resin will not come into contact with the coil wire 73a led out from the coil 73. That is, the stator cover 90 can protect the coil wire 73a led out from the molten resin in the through-hole 97h.

[0115] When viewed axially, the through-hole 97h of this embodiment overlaps with the first through-hole 81h of the circuit board 80. 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. Furthermore, since the coil wire 73a is held by the through-hole 97h, it can be stably soldered relative to the first through-hole 81h, thereby improving the reliability of the connection between the coil wire 73a and the circuit board 80.

[0116] In this embodiment, the through-hole 97h extends axially inside the columnar portion 97. Furthermore, the columnar portion 97 extends axially and penetrates the resin housing 30 axially. Therefore, a longer through-hole 97h can be ensured, thereby improving the reliability of the through-hole 97h in retaining the coil wire 73a.

[0117] The upper end face (front end face) 97a of the columnar portion 97 protrudes upward relative to the resin housing 30. The resin housing 30 is covered by the mold during molding. The upper end face 97a of the columnar portion 97 faces the circuit board 80 and has an opening for a through hole 97h. Therefore, during the molding of the resin housing 30, molten resin does not penetrate into the interior of the through hole 97h, thus providing more reliable protection for the coil wire 73a.

[0118] like Figure 7 As shown, a terminal holding portion 98 is disposed on the upper surface of the annular main body portion 93 of the second cover 92. The terminal holding portion 98 has: a radially extending portion 98a that extends radially outward relative to the second cover 92; and an upper protrusion 98b that extends upward from the radially outward end of the radially extending portion 98a. The terminal holding portion 98 internally embeds and holds a plurality of (three in this embodiment) terminals 8. The second cover 92 is formed by molding an insert into which the terminals 8 are embedded.

[0119] The terminal block 8 has: a base 8c extending radially; a first end 8a extending upward from a radially inner end of the base 8c; and a second end 8b extending upward from a radially outer end of the base 8c. The base 8c extends radially inside the radial extension 98a of the terminal holding portion 98. The first end 8a protrudes upward from the radial extension 98a. The second end 8b extends upward along the upper protrusion 98b and protrudes upward from the upper end face of the upper protrusion 98b.

[0120] like Figure 2 As shown, the first end 8a of the terminal 8 protrudes upward from the upper surface 30g of the resin housing 30 through the interior of the housing. 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 solder.

[0121] The second end 8b of the terminal block 8 protrudes upward from the connector portion 39 of the resin housing 30. The connector portion 39 exposes and surrounds the second end 8b of the terminal block 8. The second end 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 block 8. In addition, the circuit board 80 supplies power to the coil 73 from the coil wire 73a.

[0122] According to this embodiment, the stator cover 90 has a terminal holding portion 98, so the terminal 8 can be held in the stator cover 90 in advance. Therefore, during the molding of the resin housing 30, the terminal 8 can be easily embedded into the interior of the resin housing 30, which simplifies the manufacturing process.

[0123] The pump cover 20 forms the lower end of the housing 2. The pump cover 20 is located below (on the axial side) 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 enclosure 22, an upper cylindrical section 21, an inlet pipe 26, and an outlet pipe 27 (see reference). Figure 1 The pump enclosure 22 covers the pump section 60 from the radially outer and lower sides.

[0124] A flow path for supplying water (liquid) is provided inside the pump enclosure 22. An upper cylindrical portion 21 extends upward from the upper end of the pump enclosure 22. The upper cylindrical portion 21 is cylindrical with the central axis J as its center. The upper cylindrical portion 21 surrounds the outer peripheral surface of the retaining cylinder portion 31 of the resin housing 30.

[0125] like Figure 1 As shown, the inlet pipe 26 extends downward from the lower end of the pump enclosure 22. Additionally, 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.

[0126] The pump housing 20 is joined to the resin housing 30 and the support member 10 by welding. The joining structure of the pump housing 20 to the resin housing 30 and the support member 10 will be described below. The pump housing 20 is welded to the resin housing 30 and the support member 10 by rotational welding.

[0127] like Figure 6 As shown, the pump housing 20 has an annular first contact surface 20f. The first contact surface 20f has a main region 20a facing upward (the other side of the axial direction) and a secondary region 20b facing radially inward. The main region 20a is the upper end face of the pump enclosure 22. The secondary region 20b is located on the inner circumferential surface of the upper cylindrical portion 21. The main region 20a and the secondary region 20b are connected perpendicularly to each other. Both the main region 20a and the secondary region 20b extend in an annular shape along the circumferential direction with the central axis J as the center.

[0128] The resin shell 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 downward (to the other side of the axial direction). 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 a ring shape around the central axis J in the circumferential direction. The second contact surface 30f is the lower end surface of the retaining cylinder portion 31. On the other hand, the fourth contact surface 30e is located on the outer circumferential surface of the retaining cylinder portion 31. That is, the second contact surface 30f and the fourth contact surface 30e are provided on the retaining cylinder portion 31. The second contact surface 30f contacts and is fused together with 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 fused together with the secondary region 20b of the first contact surface 20f in the radial direction.

[0129] 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 (to the other side of the axial direction). The third contact surface 10f extends in a ring shape around the central axis J in the circumferential direction. 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 fused together with the main area of ​​the first contact surface 20f in the vertical direction. The third contact surface 10f is arranged adjacent to the radially inner side of the second contact surface 30f. The second contact surface 30f and the third contact surface 10f are arranged on the same plane perpendicular to the central axis J.

[0130] According to this embodiment, the first contact surface 20f of the pump housing 20 is fused to the second contact surface 30f of the resin housing 30 and the third contact surface 10f of the support member 10. By fusing the first contact surface 20f to the second contact surface 30f, the waterproof area A1 and the flow path area A2 inside the housing 2 can be sealed relative to the outside of the housing 2. Furthermore, by fusing the first contact surface 20f to the third contact surface 10f, the waterproof area A1 and the flow path area A2 can be sealed to each other inside the housing 2. Therefore, the pump 1 can be sealed without using sealing components such as O-rings, reducing the number of components and enabling the manufacture of an inexpensive and highly reliable pump 1.

[0131] Furthermore, according to this embodiment, the resin housing 30 and the support member 10 are fused to a contact surface (first contact surface 20f) of the pump cover 20. Therefore, in a single fusion process, both the resin housing 30 and the support member 10 can be joined to the pump cover 20, thereby simplifying the fusion process.

[0132] According to this embodiment, since the first contact surface 20f is annular, the welding portion can be configured in annular shape, and the inner and outer regions of the welding portion can be sealed to each other. Furthermore, by making the first contact surface 20f annular, rotary welding can be used to weld the contact surfaces together by rotating the pump housing 20 relative to the resin housing 30 and the support member 10, thereby improving the efficiency of the welding process.

[0133] In addition, this embodiment illustrates the joining of the pump housing 20, resin housing 30, and support member 10 by rotary welding, but other welding methods may also be used. For example, the pump housing 20, resin housing 30, and support member 10 may also be welded together by ultrasonic welding, laser welding, or the like.

[0134] According to this embodiment, the first contact surface 20f faces upward, and the second contact surface 30f and the third contact surface 10f, which are fused to the first contact surface 20f, face downward. Therefore, fusion can be performed while applying axial stress to the contact portion between the first contact surface 20f and the second contact surface 30f and the third contact surface 10f, thereby improving the fusion efficiency when rotary fusion is used.

[0135] As described above, the support member 10 is molded from the resin housing 30. Therefore, the support member 10 and the resin housing 30 are in close contact with each other, but not joined. Thus, a small gap is provided between the support member 10 and the resin housing 30.

[0136] 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 radially adjacent to each other. Therefore, a portion of the molten resin material during the welding process enters and solidifies into the tiny gap between the support member 10 and the resin housing 30. As a result, a seal can be achieved between the support member 10 and the resin housing 30, thereby enabling a sealing structure with higher reliability.

[0137] Based on Figure 1 As explained, the protrusion 11e provided on the outer peripheral surface of the flange portion 11 is embedded in the recess 31e of the retaining cylinder portion 31. According to this embodiment, the protrusion 11e and the recess 31e function as anti-rotation portions between the support member 10 and the resin housing 30. Thus, in a welding process based on rotational welding, it is possible to suppress relative rotation between the resin housing 30 and the support member 10.

[0138] According to this embodiment, the protrusions 11e and the recesses 31e are arranged circumferentially and interlock with each other. Therefore, the minute gap between the support member 10 and the resin housing 30 extends wavyly circumferentially. The resin material molten by rotational welding expands circumferentially at the interface between the first contact surface 20f and the second and third contact surfaces 30f due to rotation during the rotational welding process. According to this embodiment, by wavyly arranging the gap between the support member 10 and the resin housing 30 circumferentially, the resin material molten during rotational welding can effectively penetrate the gap and solidify, thereby achieving a highly reliable sealing structure.

[0139] like Figure 6 As shown, in this embodiment, the pump cover 20 is fused 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, a larger area of ​​the fusion surface can be ensured, further improving the reliability of the seal. Furthermore, a labyrinthine structure with an intricate fusion surface can be formed, thereby improving the reliability of the seal and increasing the rigidity of the fusion portion.

[0140] In this embodiment, the pump cover 20 has an upper end face 21a located at the upper end of the upper cylindrical portion 21. The upper end face 21a is a flat, annular surface facing upward (to the other side of the axial direction). A stepped portion 30d, recessed downward and radially inward, is provided at the lower end of the outer peripheral surface 30a of the resin housing 30. The upper cylindrical portion 21 of the pump cover 20 is embedded in the stepped portion 30d.

[0141] The stepped portion 30d has a downward-facing opposing surface 32b. That is, the resin shell 30 has an opposing surface 32b. The opposing surface 32b faces the upper end surface 21a of the upper cylindrical portion 21 with a gap between them. According to this embodiment, by providing a gap between the opposing surface 32b and the upper end surface 21a, even when 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 shell 30 are relatively close to each other in the axial direction, interference between the opposing surface 32b and the upper end surface 21a can be suppressed.

[0142] In this embodiment, the resin shell 30, pump cover 20, and support member 10 that are fused together are preferably made of the same resin material. Similarly, the resin shell 30 and substrate cover 28 that are fused together are preferably made of the same resin material. By making the fused parts made of the same resin material, a strong fusion can be achieved, and thermal strain is less likely to occur after fusion, thereby suppressing damage to the fused part.

[0143] The various embodiments of the present invention have been described above. However, the structures and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications to the structures are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments described above.

[0144] For example, the application of the pump of the present invention is not particularly limited. The pump can also be mounted on any equipment. For example, the pump can also be mounted on a vehicle. The pump can also be a pump that transports any kind of fluid. The pump can also be an oil pump that transports oil. Furthermore, the various structures described above in this specification can be appropriately combined within a scope that does not contradict each other.

Claims

1. A pump having: A rotor that can rotate about its central axis; The stator is located radially outside the rotor and surrounds the rotor; The pump unit is connected to one axial side of the rotor; A support member having a rotor housing portion located radially inside the stator and housing the rotor therein; A motor housing that radially surrounds the stator, the rotor, and the rotor housing; and A pump cover, located on one axial side of the motor housing and the support component, covers 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 component has a third contact surface that contacts the first contact surface. The first contact surface is fused to the second contact surface and the third contact surface. The support member has a flange portion extending radially outward from one end of the rotor housing portion on the axial side. The motor housing has a retaining sleeve portion, at least a portion of which contacts the outer peripheral surface of the flange portion. The second contact surface is disposed on the retaining cylinder portion. The third contact surface is disposed on the flange portion. The support member has a positioning rib that protrudes from the end face of the flange toward the axial side and extends circumferentially, and the outer circumferential surface of the positioning rib toward the radially outward side is embedded in the inner circumferential surface of the pump cover.

2. The pump according to claim 1, wherein, The second contact surface and the third contact surface face towards one axial direction. The first contact surface has a main region facing the other side of the axial direction and fused to the second and third contact surfaces.

3. The pump according to claim 2, wherein, The second contact surface and the third contact surface are arranged adjacent to each other in the radial direction.

4. The pump according to any one of claims 1 to 3, wherein, The outer peripheral surface of the flange portion is provided with a plurality of protrusions arranged circumferentially. The inner circumferential surface of the retaining cylinder is provided with a plurality of recesses for the protrusions to be inserted.

5. The pump according to any one of claims 1 to 3, wherein, The motor housing has a fourth contact surface facing radially outward. The first contact surface has a sub-region that faces radially inward and is fused to the fourth contact surface.

6. The pump according to any one of claims 1 to 3, wherein, The support member has a flange portion extending radially outward from one end of the rotor housing portion on the axial side. The motor housing has a stepped surface that contacts the side of the flange facing the opposite axial direction.

7. The pump according to any one of claims 1 to 3, wherein, The pump cover has an upper end face facing the opposite side of the axial direction. The motor housing has a facing surface that is separated from the upper end face by a gap.

8. The pump according to claim 2 or 3, wherein, The first contact surface is rotatably fused to the second and third contact surfaces.

9. A pump having: A rotor that can rotate about its central axis; The stator is located radially outside the rotor and surrounds the rotor; The pump unit is connected to one axial side of the rotor; A support member having a rotor housing portion located radially inside the stator and housing the rotor therein; A motor housing that radially surrounds the stator, the rotor, and the rotor housing; and A pump cover, located on one axial side of the motor housing and the support component, covers 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 component has a third contact surface that contacts the first contact surface. The first contact surface is fused to the second contact surface and the third contact surface. The support member has a flange portion extending radially outward from one end of the rotor housing portion on the axial side. The motor housing has a retaining sleeve portion, at least a portion of which contacts the outer peripheral surface of the flange portion. The second contact surface is disposed on the retaining cylinder portion. The third contact surface is disposed on the flange portion. The first contact surface is rotatably fused to the second and third contact surfaces. The support member has a positioning rib that protrudes from the end face of the flange toward the axial side and extends circumferentially, and the outer circumferential surface of the positioning rib toward the radially outward side is embedded in the inner circumferential surface of the pump cover.

10. The pump according to claim 9, wherein, The outer peripheral surface of the flange portion is provided with a plurality of protrusions arranged circumferentially. The inner circumferential surface of the retaining cylinder is provided with a plurality of recesses for the protrusions to be inserted.

Images