Electric pump

Abstract

To provide an electric pump that can be reduced in size.SOLUTION: A coil guide 90 of an electric pump has a guide body 91 for guiding radially outward coil wires 29c led out from coils of a stator part to one axial side, and coil hold members 95 that are disposed on the one axial side with respect to the guide body and hold the coil wires extending radially outward from the guide body while bending them to the one axial side. The coil hold member has: a coil guide portion that includes coil guide grooves each having a first guide surface, a second guide surface, and an arcuate guide surface connecting the first guide surface and the second guide surface, and guides the coil wires extending radially outward from the guide body to the one axial side; and a hold portion for holding the coil wires extending radially outward from the guide body to the one axial side. The coil wires extend to the one axial side from the coil hold member and are electrically connected to a circuit board.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an electric pump. [Background technology]

[0002] Patent Document 1 describes a configuration in which a motor with a rotor and a stator is provided in a housing of an electric pump, and a control unit that controls the operation of the motor by controlling the power supplied to the motor. In this configuration, a switching element provided in the control unit outputs a three-phase AC current to a coil of the stator via a bus bar, thereby driving and rotating the rotor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-75872 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric pump as described above, the bus bar is disposed between the stator of the motor and the control unit, which requires a space for disposing the bus bar between the stator of the motor and the control unit, which may lead to an increase in the size of the electric pump.

[0005] In view of the above circumstances, an object of the present invention is to provide an electric pump that can be made compact. [Means for solving the problem]

[0006] One aspect of the electric pump of the present invention includes a motor having a rotor portion and a stator portion rotatable about a central axis extending in the axial direction, a pump mechanism connected to the rotor portion, a circuit board provided on one axial side of the motor, a housing that accommodates the motor, the pump mechanism, and the circuit board, and a coil guide arranged between the stator portion and the circuit board, the coil guide including a guide body that is fixed to the stator portion and that guides a coil wire led out from a coil of the stator portion to the one axial side radially outward, and a coil guide that is arranged on the one axial side of the guide body and guides a coil wire led out from the guide body to the one axial side radially outward. and a coil holding member that bends and holds the coil wire extending outward in one axial direction, the coil holding member including a coil guide groove having a first guide surface that guides the coil wire in the radial direction, a second guide surface that guides the coil wire in the axial direction, and an arc-shaped guide surface connecting the first guide surface and the second guide surface, the coil holding member having a coil guide portion that guides the coil wire extending radially outward from the guide body to one axial side, and a holding portion that holds the coil wire extending from the coil guide portion to one axial side, the coil wire extending from the coil holding member to one axial side and electrically connected to the circuit board. Effect of the Invention

[0007] According to one aspect of the present invention, there is provided an electric pump that can be made compact. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a pump according to one embodiment. [Diagram 2] FIG. 2 is a vertical cross-sectional view of a pump according to one embodiment. [Diagram 3] FIG. 3 is a perspective view showing a stator portion provided in the pump of one embodiment. [Figure 4] FIG. 4 is a plan view of a circuit board provided in the pump of one embodiment. [Diagram 5]FIG. 5 is a perspective view of a stator portion and a coil guide according to one embodiment. [Figure 6] FIG. 6 is a perspective view of a guide body of a coil guide according to one embodiment. [Figure 7] FIG. 7 is a perspective view of a coil holding member of a coil guide according to one embodiment. [Figure 8] FIG. 8 is a perspective view of the coil holding member of the embodiment, seen from a different direction than that of FIG. [Figure 9] FIG. 9 is a cross-sectional view showing a state in which a coil wire is held by a coil holding member of a coil guide according to an embodiment. [Figure 10] FIG. 10 is a perspective view showing a state in which a coil wire is passed through a coil holding member of one embodiment. [Figure 11] FIG. 11 is a perspective view showing a state in which the coil holding member of the embodiment is raised. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the following description, the direction in which the Z axis shown in each figure extends is the up-down direction, the side in which the Z axis arrow points (+Z side) is called the "upper side", and the opposite side to the side in which the Z axis arrow points (-Z side) is called the "lower side". The central axis J1 shown in the following figures is a virtual axis extending parallel to the Z axis. Unless otherwise specified, the direction parallel to the axial direction of the central axis J1, i.e., the Z axis direction, is simply called the "axial direction", the radial direction centered on the central axis J1 is simply called the "radial direction", and the circumferential direction centered on the central axis J1 is simply called the "circumferential direction". Among the radial directions, the direction approaching the central axis J1 is called the radial inner side, and the direction away from the central axis J1 is called the radial outer side. In this embodiment, the "parallel direction" includes a direction that is approximately parallel, and the "orthogonal direction" includes a direction that is approximately orthogonal. In this embodiment, the upper side corresponds to the "one axial side", and the lower side corresponds to the "other axial side".

[0010] Note that the terms "upper" and "lower" are simply names used to describe the relative positional relationships of the various parts, and the actual positional relationships may be other than those indicated by these names.

[0011] A pump 10 of this embodiment shown in Fig. 1 is, for example, an electric pump mounted on a vehicle. The pump 10 pumps a fluid inside the vehicle. The fluid pumped by the pump 10 is, for example, oil. The oil is, for example, ATF (Automatic Transmission Fluid). As shown in Figs. 1 and 2, the pump 10 of this embodiment includes a motor 20, a pump mechanism 30, a housing 40, a circuit board 50, a cover 60, and a coil guide 90.

[0012] 2, in this embodiment, the motor 20, the pump mechanism 30, and the circuit board 50 are accommodated in a housing 40. The housing 40 has a housing main body portion 41, a flange portion 42, and a mounting surface 48.

[0013] The housing body 41 has a motor housing 15, a pump housing 16, a base housing 17, and a pump cover 13. In this embodiment, the motor housing 15, the pump housing 16, and the base housing 17 are part of a single, identical member.

[0014] In this embodiment, the motor housing 15 is cylindrical and extends in the axial direction. The motor housing 15 is disposed between the pump housing 16 and the base housing 17 in the axial direction. The motor housing 15 has a motor accommodating recess 41a that opens upward and downward. The motor 20 is accommodated radially inside the motor accommodating recess 41a.

[0015] The pump housing 16 is connected to the lower side of the motor housing 15. The pump housing 16 has a pump accommodating recess 41e which is a recess that opens to the lower side. The lower opening of the pump accommodating recess 41e is closed by the pump cover 13. The pump mechanism 30 is accommodated on the radially inner side of the pump accommodating recess 41e.

[0016] The pump cover 13 has a cylindrical protrusion 44 extending in the axial direction. The protrusion 44 extends downward from the bottom of the pump cover 13. The protrusion 44 extends in the axial direction about a second central axis J2. The second central axis J2 of the protrusion 44 is disposed at a position radially shifted from the central axis J1. The second central axis J2 and the central axis J1 extend parallel to each other.

[0017] The protrusion 44 has an inlet 44a. The inlet 44a is connected to the internal space of the pump accommodating recess 41e. The inlet 44a is configured as a through hole that penetrates the pump cover 13 in the axial direction. The inlet 44a allows oil to flow into the pump mechanism 30. In other words, the pump mechanism 30 draws oil from outside the device through the inlet 44a. The pump cover 13 includes an outlet (not shown). The pump mechanism 30 allows the oil to flow out from the outlet.

[0018] The flange portion 42 extends radially outward from the outer circumferential surface of the housing main body 41. A plurality of flange portions 42 are provided at intervals from one another in the circumferential direction. The flange portion 42 has an end face 42a facing downward and a mounting hole 42h. The end face 42a is flat and extends in a direction perpendicular to the central axis J1. The end face 42a contacts a target attachment portion of the pump 10. The mounting hole 42h passes through the flange portion 42 in the axial direction. The mounting hole 42h is disposed in each flange portion 42. A screw member (not shown) is inserted into the mounting hole 42h to fix the pump 10 to a target attachment portion.

[0019] 2, the housing body 41 has a through hole 41c that axially connects the interior of the motor accommodating recess 41a and the interior of the pump accommodating recess 41e. An oil seal 43 is held in the through hole 41c to seal between the inner circumferential surface of the through hole 41c and the outer circumferential surface of the shaft 22, which will be described later.

[0020] The motor 20 is accommodated in the motor accommodating recess 41a. The motor 20 includes a rotor portion 21 having a shaft 22 extending along a central axis J1, and a stator portion 26.

[0021] The rotor portion 21 rotates about a central axis J1. The shaft 22 is rotatable around the central axis J1. A lower end of the shaft 22 protrudes into the pump accommodating recess 41e through the through hole 41c and is connected to the pump mechanism 30. The shaft 22 is rotatably supported by a bearing (not shown), such as a plain bearing, provided between the through hole 41c and the pump accommodating recess 41e. A bearing supporting the shaft 22 may be provided in the pump housing 16. An upper end of the shaft 22 may be held by a bearing (not shown).

[0022] Rotor core 23 is fixed to the outer circumferential surface of shaft 22. Rotor core 23 is annular about central axis J1. Rotor core 23 is cylindrical and extends in the axial direction. Rotor core 23 is formed, for example, by stacking a plurality of electromagnetic steel plates in the axial direction.

[0023] The stator portion 26 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap therebetween. That is, the stator portion 26 faces the rotor portion 21 in the radial direction. The stator portion 26 surrounds the rotor portion 21 from the radially outside over the entire circumferential circumference. As shown in Figs. 2 and 3, the stator portion 26 has a stator core 27 and a plurality of coils 29.

[0024] The stator core 27 is annular about the central axis J1. The stator core 27 surrounds the rotor portion 21 from the radial outside. The stator core 27 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap therebetween. The stator core 27 is formed, for example, by stacking a plurality of electromagnetic steel plates in the axial direction.

[0025] As shown in FIG. 3, the stator core 27 has a core back 27a and a plurality of teeth 27b. The core back 27a is annular about a central axis. The core back 27a is cylindrical and extends in the axial direction. A radially outer surface of the core back 27a is fixed to an inner peripheral surface of the housing 40. The core back 27a fits into the housing 40. The teeth 27b extend radially inward from a radially inner surface of the core back 27a. The multiple teeth 27b are arranged on the radially inner surface of the core back 27a at intervals from one another in the circumferential direction.

[0026] The multiple coils 29 are attached to the stator core 27 via the insulators 28. That is, the multiple coils 29 are attached to the stator core 27 via the insulators 28. The insulators 28 have a portion that covers the teeth 27b. The material of the insulators 28 is an insulating material such as resin. The multiple coils 29 are each formed by winding a coil wire 29c around each tooth 27b via the insulators 28.

[0027] The motor 20 of this embodiment is a three-phase motor. The coils 29 include U-phase, V-phase, and W-phase coils. Each coil 29 is connected to a portion of the circuit board 50 corresponding to one of the U-phase, V-phase, and W-phase. Each coil 29 has a winding portion 29a, a crossover portion 29b, and a coil wire 29c. The winding portion 29a is a portion formed by winding a wire around a part of the stator core 27. The crossover portion 29b is a portion that connects the winding portions 29a between the coils 29 of the same phase. The coil wire 29c is drawn upward from the winding portion 29a and connected to the circuit board 50 via a coil guide 90 described later.

[0028] As shown in FIG. 2, the pump mechanism 30 is driven by the motor 20. The pump mechanism 30 is disposed below the stator portion 26. The pump mechanism 30 is connected to the rotor portion 21. In this embodiment, the pump mechanism 30 has a trochoid pump structure. The pump mechanism 30 has an inner rotor 30a and an outer rotor 30b located radially outside the inner rotor 30a. The inner rotor 30a and the outer rotor 30b are pump gears and mesh with each other. The inner rotor 30a and the outer rotor 30b each have a trochoid tooth profile. The inner rotor 30a is fixed to the end of the shaft 22 on the other axial side. In this manner, the pump mechanism 30 is driven by the inner rotor 30a being rotated together with the shaft 22.

[0029] The board housing 17 is located at the upper end of the housing main body 41. The board housing 17 is cylindrical and centered on the central axis J1. The board housing 17 has an accommodating recess 41k consisting of a recess that opens at least upward. A board support surface 17g is provided on the inner circumferential surface of the accommodating recess 41k. A plurality of board support surfaces 17g are provided at intervals from each other in the circumferential direction. The board support surface 17g is perpendicular to the axial direction and faces downward. The circuit board 50 is accommodated in the accommodating recess 41k of the board housing 17 by being supported by the board support surface 17g.

[0030] A connector portion 80 is provided on the upper side of the housing 40. The connector portion 80 is provided on a radially outer surface of the board housing 17. The connector portion 80 protrudes radially outward from the board housing 17. The connector portion 80 is connected to the circuit board 50, and for example, an external power supply is connected thereto. This allows the circuit board 50 to supply power, supplied from the connector portion 80, to the stator portion 26.

[0031] As shown in FIGS. 2 and 4, the circuit board 50 includes a base material 55, an inverter unit 52, a processor (not shown), a capacitor 57, and an inductor 58. The circuit board 50 is plate-shaped with its plate surface facing the axial direction. The circuit board 50 is located on one axial side of the motor 20. The circuit board 50 is supported from the other axial side by a plurality of board support surfaces 17g, and is fixed to each of the plurality of board support surfaces 17g by screws. In this way, the circuit board 50 is supported by the housing 40.

[0032] The circuit board 50 is electrically connected to the end of the coil wire 29c of the coil 29 constituting the stator portion 26. As shown in FIG. 4, in this embodiment, the coil wire 29c of the stator portion 26 is connected to the circuit board 50 at three locations spaced apart in the circumferential direction on the outer periphery of the circuit board 50. Two coil wires 29c are disposed at each location on the circuit board 50. Each coil wire 29c is a part of the coil 29 of any one of the U-phase, V-phase, and W-phase.

[0033] As shown in FIG. 2, the inverter unit 52 is electrically connected to the motor 20. The inverter unit 52 is attached to a base material 55 of the circuit board 50. In this embodiment, the inverter unit 52 is attached to a lower surface 55b on the other axial side of the base material 55. The inverter unit 52 includes a plurality of FETs 52a. The FETs 52a are, for example, field effect transistors. The inverter unit 52 is electrically connected to the stator unit 26 via the coil wire 29c of the coil 29 connected to the circuit board 50.

[0034] The processor (not shown) is electrically connected to the inverter unit 52. The processor is attached to the lower surface 55b of the base material 55 at a position different from that of the inverter unit 52. The processor controls the supply of electricity to the inverter unit 52.

[0035] 2 and 4, the capacitor 57 and the inductor 58 are disposed on the other side in the Y direction (+Y side) with respect to the central axis J1. The capacitor 57 is an electronic component attached to an upper surface 55a on one axial side of the base material 55. The capacitor 57 has a cylindrical shape that protrudes upward from the circuit board 50. The capacitor 57 is electrically connected to the inverter unit 52 via the circuit board 50.

[0036] Inductor 58 is attached to upper surface 55a of base material 55. Inductor 58 is used to boost the voltage of power supplied from an external source to pump 10. Inductor 58 is electrically connected to inverter unit 52 via circuit board 50. As a result, capacitor 57 and inductor 58 are electrically connected to stator unit 26 via circuit board 50, inverter unit 52, and coil wire 29c.

[0037] Compared with inductor 58, capacitor 57 has a larger protruding dimension upward (to one axial side) from circuit board 50. In other words, capacitor 57 is a component that is taller than inductor 58. An upper tip surface 57t of capacitor 57 is disposed near mounting surface 48 in the axial direction.

[0038] In this embodiment, a heat dissipation material 70 is provided on the upper side of the circuit board 50. The heat dissipation material 70 is in a sheet shape along an XY plane perpendicular to the axial direction, and covers at least a part of the circuit board 50. In this embodiment, the heat dissipation material 70 includes a material having high thermal conductivity, such as an aluminum-based material or a copper-based material. The heat dissipation material 70 is provided on an upper surface 55a of a base material 55 of the circuit board 50.

[0039] In this embodiment, the inverter unit 52 and the processor (not shown) are heat-generating components that generate heat when the pump is driven. The heat dissipation material 70, the inverter unit 52, and the processor (not shown) are disposed on opposite sides of the circuit board 50 in the axial direction. The heat dissipation material 70 is provided at a position overlapping the inverter unit 52 and the processor (not shown), which are heat-generating components mounted on the circuit board 50, when viewed from the axial direction. As shown in FIG. 2, the heat dissipation material 70 is in close contact with the upper surface 55a of the base material 55 of the circuit board 50. The heat dissipation material 70 is fixed to the base material 55 by, for example, grease, adhesive, or the like.

[0040] As shown in Figs. 1 and 2, the cover 60 is disposed on the upper side of the housing 40. The cover 60 covers the accommodating recess 41k of the board housing 17 from above. In this embodiment, the cover 60 is fixed to a mounting surface 48 located at the upper end of the housing 40. In this embodiment, the mounting surface 48 is provided at the upper end of the board housing 17. The mounting surface 48 has an annular shape that is continuous in the circumferential direction radially outside the accommodating recess 41k when viewed in the axial direction.

[0041] The cover 60 is formed by pressing a metal plate into a predetermined shape as shown below. The cover 60 has a fixing portion 61, a cover recess 62, a cover protrusion 63, a first rib 64, and a second rib 65. When viewed in the axial direction, the cover 60 has an outer shape that matches the upper end of the housing main body 41 (substrate housing 17).

[0042] The fixing portion 61 is provided continuously in the circumferential direction on the outer circumferential edge portion of the cover 60. The fixing portion 61 is fixed to the mounting surface 48 of the housing 40 by a plurality of bolts 68. In this manner, the cover 60 is fixed to the mounting surface 48 of the board housing 17, and closes the accommodating recess 41k from above.

[0043] The cover recess 62 is located radially inside of the fixed portion 61. The cover recess 62 is recessed downward (the other axial side) with respect to the fixed portion 61. In the present embodiment, the cover recess 62 is located on one side in the Y direction (-Y side) with respect to the central axis J1 in a state in which the cover 60 is attached to the mounting surface 48.

[0044] The cover recess 62 has a bottom surface 62b, an inclined surface 62s, and a connecting inclined surface 62j. The bottom surface 62b is a surface perpendicular to the axial direction. The lower surface of the bottom surface 62b contacts the heat dissipation material 70. The inclined surface 62s is provided on the radially outer side of the bottom surface 62b. The inclined surface 62s inclines upward from the bottom surface 62b toward the radially outer side, and is connected to the fixing portion 61. The connecting inclined surface 62j is a surface provided in a portion adjacent to the cover protrusion 63. The connecting inclined surface 62j is a surface inclined upward from the bottom surface 62b toward the cover protrusion 63.

[0045] The cover protrusion 63 is provided on the radial inner side of the fixed portion 61 at a position different from the cover recess 62. In the present embodiment, the cover protrusion 63 is located on the other side in the Y direction (+Y side) with respect to the central axis J1 in a state in which the cover 60 is attached to the mounting surface 48. The cover protrusion 63 protrudes upward with respect to the fixed portion 61. The cover protrusion 63 has a tip surface 63t and an inclined surface 63s.

[0046] The tip surface 63t is a surface perpendicular to the axial direction. The inclined surface 63s is provided on the radially outer side of the tip surface 63t. The inclined surface 63s is inclined downward from the tip surface 63t toward the radially outer side and is connected to the fixing portion 61.

[0047] The cover protrusion 63 is provided so as to cover the capacitor 57 of the circuit board 50. That is, the capacitor 57 is provided so as to overlap the cover protrusion 63 when viewed in the axial direction. In this embodiment, the tip surface 63t of the cover protrusion 63 is disposed between the capacitor 57 and is spaced apart in the axial direction.

[0048] The first rib 64 is provided along the bottom surface 62b of the cover recess 62. In this embodiment, the tip surface of the first rib 64 is located below the fixing portion 61. That is, the cover 60 has a shape that does not allow the first rib 64 to protrude from inside the cover recess 62. The first rib 64 protrudes upward from the bottom surface 62b. The first rib 64 is provided in a curved surface shape having a predetermined curvature radius. The first rib 64 extends in a direction along the bottom surface 62b. In this embodiment, a plurality of first ribs 64 are provided. In this embodiment, the first rib 64 includes an inner rib 64A and an outer rib 64B. In this embodiment, the inner rib 64A is provided on the bottom surface 62b on the side of the connecting inclined surface 62j. The inner rib 64A extends along the bottom surface 62b to the -Y side and is connected to the connecting inclined surface 62j.

[0049] The outer periphery rib 64B extends along the bottom surface 62b and is continuous with the inclined surface 62s. The outer periphery rib 64B is provided at a position corresponding to the wiring and electronic components protruding upward from the base material 55. By providing the outer periphery rib 64B, the cover 60 can prevent contact with the wiring and electronic components protruding upward from the base material 55.

[0050] The second rib 65 is provided on the tip surface 63t of the cover protrusion 63. The second rib 65 is recessed downward from the tip surface 63t and extends in a groove shape along the tip surface 63t. In this embodiment, the second ribs 65 are provided in, for example, three locations. The multiple second ribs 65 are aligned in the X direction when viewed from the axial direction and are positioned so as not to interfere with the condenser 57.

[0051] As shown in Fig. 2, a coil guide 90 is provided on the upper side of the circuit board 50. The coil guide 90 is disposed between the stator portion 26 and the circuit board 50. The coil guide 90 holds the coil wire 29c extending upward from the winding portion 29a of the coil 29. As shown in Fig. 5, the coil guide 90 has a guide body 91, a support portion 92, and a coil holding member 95. The guide body 91 and the coil holding member 95 of the coil guide 90 are each made of an insulating resin material.

[0052] 5 and 6, the guide body 91 is annular about the central axis J1 when viewed in the axial direction. The guide body 91 is integrally provided with a plate-shaped portion 91a, an inner peripheral rib 91p, an outer peripheral rib 91q, and a radial rib 91s. The plate-shaped portion 91a is a plate whose plate surface faces the axial direction. The guide body 91 guides the coil wire 29c led out upward from the coil 29 of the stator portion 26 radially outward.

[0053] The inner peripheral rib 91p, the outer peripheral rib 91q, and the radial rib 91s are provided on the surface of the plate-shaped portion 91a facing the upper side. The inner peripheral rib 91p rises upward from the inner peripheral edge portion on the radially inner side of the plate-shaped portion 91a. The inner peripheral rib 91p is provided continuously in the circumferential direction. The outer peripheral rib 91q rises upward from the outer peripheral edge portion on the radially outer side of the plate-shaped portion 91a. The outer peripheral rib 91q is provided continuously in the circumferential direction. A plurality of radial ribs 91s are provided at intervals in the circumferential direction. Each radial rib 91s rises upward from the plate-shaped portion 91a and extends continuously in the approximately radial direction along a slit 93 described later to connect the inner peripheral rib 91p and the outer peripheral rib 91q. The inner peripheral rib 91p, the outer peripheral rib 91q, and the radial rib 91s reinforce the plate-shaped portion 91a, thereby increasing the strength of the guide body 91.

[0054] The guide body 91 is provided with a support portion 92, a plurality of legs 94, and a slit 93. The legs 94 are provided on the lower side of the plate-shaped portion 91a. The legs 94 are fixed to the stator portion 26. The legs 94 fix the guide body 91 to the stator portion 26. The legs 94 are provided at intervals in the circumferential direction of the plate-shaped portion 91a. Each leg 94 extends downward from the outer circumferential edge of the plate-shaped portion 91a. A tip 94s of each leg 94 abuts against an upper surface 27s facing upward of the core back 27a of the stator core 27. This restricts the guide body 91 from moving downward. When the tip 92s of each leg 94 abuts against the upper surface 27s, a gap is provided between the guide body 91 and the stator portion 26 in the axial direction.

[0055] Further, a fixing claw 94t is provided at the lower end of each leg 94. Each fixing claw 94t protrudes radially inward. As shown in FIG. 8, the fixing claw 94t of the leg 94 is fixed by being hooked into a recess 28b provided on the radially outer surface of the insulator 28 of the stator portion 26. The fixing claws 94t of the multiple legs 94 are hooked into the recess 28b, thereby restricting the upward movement of the guide body 91. Furthermore, by fixing the legs 94 to the stator portion 26 during assembly, the guide body 91 can be easily attached to the stator portion 26.

[0056] As shown in FIG. 6, the slits 93 are provided in the plate-shaped portion 91a of the guide body 91. The slits 93 are provided in a plurality of locations spaced apart in the circumferential direction. In this embodiment, the slits 93 are provided in two locations at three locations spaced apart in the circumferential direction. Each slit 93 is recessed in a V-shape or U-shape from the inner circumferential surface on the radially inner side of the plate-shaped portion 91a of the guide body 91 toward the radially outer side. In this embodiment, the width of the slit end 93e on the radially outer side of the slit 93 is smaller than the outer diameter of the coil wire 29c. The coil wire 29c drawn out from the winding portion 29a of the coil 29 to the upper side is led out radially outward through the slit 93.

[0057] The support portion 92 is provided on the outer peripheral surface on the radially outer side of the plate-shaped portion 91a (guide main body 91). A plurality of support portions 92 are provided at intervals in the circumferential direction. In this embodiment, the support portions 92 are provided at a total of three locations spaced apart in the circumferential direction. The support portions 92 are recessed radially inward from the outer peripheral surface on the radially outer side of the plate-shaped portion 91a.

[0058] The support portion 92 has a first restricting surface 92a, a second restricting surface 92b, and a third restricting surface 92c. The first restricting surface 92a is a flat surface facing radially outward. The first restricting surface 92a restricts the radially inward movement of a shaft portion 96s of a coil holding member 95, which will be described later. The second restricting surface 92b is a surface provided so as to rise radially outward from an upper end portion of the first restricting surface 92a. The second restricting surface 92b faces downward. The second restricting surface 92b restricts the upward movement of the shaft portion 96s of the coil holding member 95. The third restricting surface 92c is a surface provided so as to rise radially outward from both circumferential sides of the first restricting surface 92a. The third restricting surface 92c restricts the circumferential movement of the shaft portion 96s of the coil holding member 95.

[0059] A notch 91k is provided in the support portion 92. The notch 91k is provided by recessing a part of the outer circumferential rib 91q toward the other axial side. The notch 91k is provided in the circumferential center of the first restriction surface 92a.

[0060] 5, the coil holding member 95 is disposed on the upper side (one axial side) of the guide body 91. The coil holding members 95 are provided at three locations spaced apart in the circumferential direction. The coil holding members 95 bend the two coil wires 29c extending radially outward from a pair of slits 93 of the guide body 91 upward and hold them. As shown in FIGS. 7 and 8, the coil holding member 95 integrally includes a plate portion 96, a shaft portion 96s, an inner fixing portion 97, a coil guide portion 98, and a holding portion 99.

[0061] The plate portion 96 is shaped like a plate with a plate surface facing the axial direction. The plate portion 96 is supported by an outer peripheral rib 91q and an inner peripheral rib 91p of the coil holding member 95 from below. The shaft portion 96s is provided on both circumferential sides at the radially outer end of the plate portion 96. The shaft portion 96s protrudes from the plate portion 96 on both circumferential sides. The shaft portion 96s abuts against the support portion 92 of the guide body 91 from the radially outer side. The shaft portion 96s is rotatable around an axis perpendicular to the radial and axial directions in a state in which the shaft portion 96s is sandwiched between the third restricting surfaces 92c on both circumferential sides and restricted from moving in the circumferential direction, the first restricting surface 92a restricts the shaft portion 96s from moving in the radially inward direction, and the second restricting surface 92b restricts the shaft portion 96s from moving toward one axial side. That is, the shaft portion 96s of the coil holding member 95 is rotatably supported by the support portion 92.

[0062] The inner fixing portion 97 is provided at a radially inner end of the plate portion 96 of the guide body 91. The inner fixing portion 97 extends from the plate portion 96 to the other axial direction side. The inner fixing portion 97 extends from the inner circumferential portion of the plate portion 96 to the other axial direction side. A fixing hook 97s is provided at a lower end of the inner fixing portion 97. The fixing hook 97s is frame-shaped. The fixing hook 97s of the inner fixing portion 97 is fixed to a fixing claw provided at a tip of the inner circumferential edge portion of the guide body 91 on the other axial direction side. The shaft portion 96s is supported by the support portion 92 and the inner fixing portion 97 is fixed to the guide body 91, so that the coil holding member 95 is held by the guide body 91.

[0063] 7, 8 and 9, the coil guide portion 98 bends and guides upward the two coil wires 29c led out radially outward from the slits 93. The coil guide portions 98 are provided in groove shapes on both circumferential sides of the coil holding member 95.

[0064] The coil guide portion 98 includes a pair of coil guide grooves 100. Each coil guide groove 100 has a first guide surface 101, a second guide surface 102, and an arcuate guide surface 103.

[0065] The first guide surface 101 is a surface that guides the coil wire 29c in the radial direction. The first guide surface 101 is provided on the lower side of the plate portion 96. The first guide surface 101 extends from a radially intermediate portion of the bottom surface 96b of the plate portion 96 toward the radially outer side.

[0066] A pressing portion 99t is provided on the first guide surface 101. That is, the coil guide portion 98 has the pressing portion 99t. The pressing portion 99t protrudes downward from the first guide surface 101. The pressing portion 99t presses the coil wire 29c leading out from the slit 93 toward the guide body 91 on the lower side.

[0067] The arc-shaped guide surface 103 is an arc-curved surface that connects the first guide surface 101 and the second guide surface 102. The arc-shaped guide surface 103 is provided continuous with the first guide surface 101 and the second guide surface 102. The arc-shaped guide surface 103 is curved around an axis that follows the shaft portion 96s. The arc-shaped guide surface 103 is provided with a predetermined radius of curvature. The arcuate guide surface 103 of this embodiment has a curvature shape that, when the coil holding member 95 is rotated and fixed relative to the guide body 91, as described below, adheres tightly to the coil wire 29c so as to press it radially outward, generating a restraining force that suppresses loosening of the coil wire 29c.

[0068] The second guide surface 102 is a surface that guides the coil wire 29c in the axial direction. The second guide surface 102 is provided on a radially outer surface of the plate portion 96 along the axial direction.

[0069] The coil wire 29c led out from the guide body 91 via the slit 93 is guided radially outward by hitting the first guide surface 101 from below, and is guided upward by being bent along the arcuate guide surface 103, and is guided upward by hitting the second guide surface 102 from the radially outer side. In this way, the coil wire 29c extending radially outward from the guide body 91 is drawn upward along the coil guide groove 100 of the coil guide portion 98.

[0070] The holding portion 99 is provided at a radially outer end of the plate portion 96. The holding portion 99 protrudes upward from the plate portion 96. The holding portion 99 holds the coil wire 29c extending upward from the coil guide portion 98. The holding portion 99 is provided with a pair of through holes 99h spaced apart in the circumferential direction. The coil wire 29c extending upward from the coil guide groove 100 of the coil guide portion 98 is inserted into each of the through holes 99h. The coil wire 29c inserted into the through holes 99h extends upward and is electrically connected to the circuit board 50.

[0071] The coil holding member 95 having the above-mentioned structure is attached to the guide body 91 in the following manner. 10, coil wire 29c is drawn out from coil 29 in advance through slit 93 and led out radially outward. Next, coil holding member 95 is laid down so that through hole 99h of holding portion 99 extends along the radial direction, and coil wire 29c extending radially outward is inserted into through hole 99h. Next, the coil holding member 95 is moved radially inward while using the coil wire 29c inserted into the through hole 99h as a guide, and the shaft portion 96s is abutted against the first restriction surface 92a of the support portion 92.

[0072] 11, the coil holding member 95 is rotated around the shaft portion 96s with the shaft portion 96s abutting against the first and second restricting surfaces 92a and 92b of the support portion 92. Then, the coil wire 29c is bent along the arc-shaped guide surface 103 of the coil guide groove 100 while being held by being inserted into the through hole 99h. At this time, the arc-shaped guide surface 103 presses the coil wire 29c radially outward to come into close contact with the coil wire 29c. As a result, tension is applied to the coil wire 29c, so that the coil wire 29c held by the holding portion 99 is bent upward while preventing the coil wire 29c from loosening.

[0073] The coil wire 29c bent along the arc-shaped guide surface 103 is guided radially outward by hitting the first guide surface 101 from below, and is guided upward by hitting the second guide surface 102 from the radially outward. Furthermore, the coil wire 29c is pressed against the guide body 91 by the pressing portion 99t of the coil guide portion 98.

[0074] Thereafter, as shown in FIG. 9, the plate portion 96 is abutted against the guide body 91 from above and the inner fixing portion 97 is fixed to the inner periphery of the guide body 91, thereby completing the attachment of the coil holding member 95 to the guide body 91.

[0075] According to the pump 10 of this embodiment, the coil wire 29c derived from the coil 29 of the stator portion 26 is guided upward from the radial outside by the coil guide portion 98. The coil wire 29c extending upward from the coil guide portion 98 is held by the holding portion 99. This makes it possible to determine the circumferential position of the coil wire 29c extending upward toward the circuit board 50. In addition, by bending the coil wire 29c along the coil guide groove 100 of the coil guide portion 98, tension can be applied to the coil wire 29c derived from the coil 29, allowing it to be extended upward. In this manner, the coil 29 of the stator portion 26 and the circuit board 50 can be electrically connected without using a bus bar, and as a result, the pump 10 can be made smaller in size.

[0076] According to the pump 10 of this embodiment, when the coil holding member 95 supported by the support portion 92 is rotated about the shaft portion 96s with the coil wire 29c held by the holding portion 99, the coil wire 29c extending radially outward from the guide body 91 is bent along the coil guide groove 100 (arcuate guide surface 103) of the coil guide portion 98, and can be pulled out upward. In this manner, the coil wire 29c can be easily connected to the circuit board 50.

[0077] According to the pump 10 of the present embodiment, by inserting the coil wire 29c into the through hole 99h of the coil holding member 95, the position in the circumferential direction of the coil wire 29c connected to the circuit board 50 can be determined more stably.

[0078] According to the pump 10 of this embodiment, the coil wire 29c extending from the coil 29 is pressed by the pressing portion 99t of the coil holding member 95, thereby preventing the coil wire 29c from shifting in position due to vibration or the like. This reduces the load on the connection portion between the coil wire 29c and the circuit board 50.

[0079] According to the pump 10 of the present embodiment, the inner fixing portion 97 of the coil holding member 95 is fixed to the radially inner side of the guide body 91, whereby the coil holding member 95 can be fixed to the guide body 91.

[0080] According to the pump 10 of this embodiment, the coil wire 29c derived from the coil 29 is pulled out toward the coil guide portion 98 through the slit 93, thereby stabilizing the introduction position (pulling out position) of the coil wire 29c relative to the coil guide portion 98.

[0081] According to the pump 10 of this embodiment, since the width of the slit end 93e of the slit 93 is smaller than the outer diameter of the coil wire 29c, the coil wire 29c arranged in the slit 93 is sandwiched by the slit 93. This makes it possible to more reliably stabilize the introduction position of the coil wire 29c with respect to the coil guide portion 98.

[0082] According to the pump 10 of this embodiment, the coil guide 90 has a plurality of legs 94, so that the guide body 91 can be reliably fixed to the stator portion 26. This makes it possible to determine the position of the guide body 91 relative to the stator portion 26, and thus the circumferential position of the coil wire 29c extending upward can be stably determined. Moreover, in this embodiment, by hooking the fixing claws 94t of the legs 94 onto the stator portion 26, it is possible to restrict the upward movement of the guide body 91. Moreover, by fixing the legs 94 to the stator portion 26 during assembly, the guide body 91 can be easily attached to the stator portion 26.

[0083] According to the pump 10 of the present embodiment, the coil guide 90 is made of a resin material, which allows easy and low-cost manufacture of the coil guide 90. Furthermore, the use of an insulating resin material can prevent the coil wire 29c from shorting out.

[0084] Although one embodiment of the present invention has been described above, each configuration and their combination in the embodiment is merely an example, and addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiment.

[0085] The use of the electric pump to which the present invention is applied is not particularly limited. The type of fluid delivered by the electric pump is not particularly limited and may be water, etc. The predetermined object to which the electric pump is attached may be any object. The electric pump may be mounted on equipment other than a vehicle. The electric pump may be disposed in any manner with respect to the vertical direction. The central axis of the motor of the electric pump may extend in a direction inclined with respect to the vertical direction without being perpendicular to the vertical direction, or may extend parallel to the vertical direction. Note that the configurations and methods described in this specification may be appropriately combined within a range that does not contradict each other. [Explanation of symbols]

[0086] 10...pump (electric pump), 20...motor, 21...rotor portion, 26...stator portion, 29...coil, 29c...coil wire, 30...pump mechanism, 40...housing, 50...circuit board, 61...fixed portion, 90...coil guide, 91...guide body, 99h...through hole, 92...support portion, 93...slit, 93e...slit end, 94...leg portion, 94t...fixing claw, 95...coil holding member, 96s...shaft portion, 97...inner fixed portion, 98...coil guide portion, 99...holding portion, 99t...pressing portion, 100...coil guide groove, 101...first guide surface, 102...second guide surface, 103...arcuate guide surface, J1...central axis.

Claims

1. A motor having a rotor portion and a stator portion that can rotate around a central axis extending in the axial direction. and, a pump mechanism coupled to the rotor portion; a circuit board provided on one axial side of the motor; a housing containing the motor, the pump mechanism, and the circuit board; a coil guide disposed between the stator portion and the circuit board, The coil guide is The coil is fixed to the stator portion and led out from the coil of the stator portion to one side in the axial direction. a guide body that guides the coil wire radially outward; The guide body is disposed on one side of the guide body in the axial direction. a coil holding member that holds the coil wire extending outward by bending it to one side in the axial direction; having The coil holding member is a first guide surface that guides the coil wire in the radial direction; a second guide surface that is in contact with the first guide surface and an arc-shaped guide surface that connects the first guide surface and the second guide surface, a coil guide groove for guiding the coil wire extending from the guide body to the outside in the radial direction; A coil guide portion that guides the coil to one side in the axial direction; a holding portion that holds the coil wire extending from the coil guide portion to one axial side; Has The coil wire extends from the coil holding member to one side in the axial direction and is connected to the circuit board. Electric pump, electrically connected.

2. The coil holding member is a support member provided on an outer periphery of the guide body on the radially outer side. a shaft portion supported rotatably on the The coil holding member holds the coil pulled out radially outward from the guide body. When the wire is held by the holding portion, the wire is rotated around the shaft portion, so that the coil guide groove 2. The electric pump according to claim 1, wherein the coil wire is bent toward one side in the axial direction along a line extending from the center of the coil wire to the center of the 。

3. The coil winding according to claim 1 or 2, wherein the holding portion has a through hole into which the coil wire is inserted. Dynamic pump.

4. The coil guide portion guides the coil wire led out from the coil relative to the guide body. The electric pump according to claim 1 , further comprising a pressing portion that presses against the inner wall of the pump.

5. The coil holding member is provided on the radially inner side of the guide body, and is disposed on the other axially outer side of the guide body.

5. The guide body according to claim 1, further comprising an inner fixing portion extending to the inner side and fixed to the guide body.

13. The electric pump according to claim 1.

6. The guide body has an annular shape when viewed in the axial direction, The guide body has a slit recessed from a radially inner circumferential surface toward a radially outer side. 、 The coil wire led out from the coil is pulled radially outward through the slit. The coil according to any one of claims 1 to 5, wherein the coil is held by the coil holding member. Electric pump.

7. The width of the slit at the radially outer end of the slit is smaller than the outer diameter of the coil wire. The electric pump according to claim 6.

8. The coil guide is The guide body has a plurality of legs extending from the guide body to the other axial direction and fixed to the stator portion. The electric pump according to any one of claims 1 to 7.

9. Each of the legs has a fixing claw, The plurality of legs are fixed to the stator portion by hooking the fixing claws onto the radially outer side of the stator portion. The electric pump according to claim 8, wherein the rotor is fixed to the stator portion.

10. The coil guide according to any one of claims 1 to 9, wherein the coil guide is made of a resin material. On-board electric pump.

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