CN115149687A

CN115149687A - Electric pump

Info

Publication number: CN115149687A
Application number: CN202210310470.2A
Authority: CN
Inventors: 片冈慈裕; 金物弘贵; 小林喜幸
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Powertrain Systems Corp
Priority date: 2021-03-29
Filing date: 2022-03-28
Publication date: 2022-10-04
Also published as: JP2022151947A

Abstract

An electric pump having: a motor having a rotor portion and a stator portion; a pump mechanism connected to the rotor; a circuit board disposed on one axial side of the motor; a housing; a coil guide. The coil guide has: a guide body that guides the coil wire, which is led out from the coil of the stator portion to one side in the axial direction, to the outside in the radial direction; and a coil holding member that is disposed on one axial side of the guide body and that holds a coil extending radially outward from the guide body by bending the coil toward one axial side. The coil holding member includes: a coil guide portion that guides a coil wire extending radially outward from the guide body to one side in the axial direction, the coil guide portion including a coil guide groove having a first guide surface, a second guide surface, and an arc-shaped guide surface connecting the first guide surface and the second guide surface; and a holding portion that holds the coil wire extending from the coil guide portion to one axial side. The coil wire extends from the coil holding member to one axial side and is electrically connected to the circuit board.

Description

Electric pump

Technical Field

The present invention relates to an electric pump.

Background

Patent document 1 describes the following structure: the housing of the electric pump is provided with: a motor having a rotor portion and a stator; and a control unit for controlling the operation of the motor by controlling the electric power supplied to the motor. In this configuration, the rotor portion is driven to rotate by outputting a three-phase ac current from a switching element provided in the control portion to the coil of the stator via the bus bar.

Patent document 1: japanese patent laid-open publication No. 2019-75872

In the electric pump as described above, the bus bar is disposed between the stator of the motor and the control unit. Therefore, a space for arranging the bus bar needs to be secured between the stator of the motor and the control unit, which may increase the size of the electric pump.

Disclosure of Invention

In view of the above circumstances, an object of the present invention is to provide an electric pump that can be reduced in size.

One embodiment of the present invention is an electric pump including: a motor having a rotor portion and a stator portion, the rotor portion being rotatable about a central axis extending in an axial direction; a pump mechanism connected to the rotor portion; a circuit board disposed on one axial side of the motor; a housing that houses the motor, the pump mechanism, and the circuit board; and a coil guide disposed between the stator portion and the circuit board, the coil guide including: a guide body fixed to the stator portion, the guide body guiding a coil wire led out from the coil of the stator portion to one side in the axial direction to the outside in the radial direction; and a coil holding member that is disposed on one side in the axial direction with respect to the guide body and that holds the coil wire extending from the guide body to the radially outer side by bending the coil wire toward the one side in the axial direction, the coil holding member including: a coil guide portion that guides the coil wire extending from the guide body to the radially outer side toward the one side in the axial direction, the coil guide portion including a coil guide groove that has 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 that connects the first guide surface and the second guide surface; and a holding portion that holds the coil wire extending from the coil guide portion to the one side in the axial direction, the coil wire extending from the coil holding member to the one side in the axial direction and being electrically connected to the circuit board.

According to one embodiment of the present invention, an electric pump that can be miniaturized is provided.

Drawings

Fig. 1 is a perspective view showing a pump of one embodiment.

Fig. 2 is a longitudinal sectional view of an embodiment of the pump.

Fig. 3 is a perspective view showing a stator portion provided in a pump according to an embodiment.

FIG. 4 is a plan view of a circuit board disposed on an embodiment of a pump.

Fig. 5 is a perspective view of a stator portion and a coil guide of one embodiment.

Fig. 6 is a perspective view of a guide body of a coil guide according to an embodiment.

Fig. 7 is a perspective view of a coil holding member of the coil guide according to one embodiment.

Fig. 8 is a perspective view of the coil holding member according to the embodiment as viewed from a direction different from that of fig. 7.

Fig. 9 is a 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.

Fig. 10 is a perspective view showing a state in which coil wires are passed into the coil holding member of the embodiment.

Fig. 11 is a perspective view showing a state in which the coil holding member of the embodiment is pulled up.

Description of the reference symbols

10: a pump (electric pump); 20: a motor; 21: a rotor portion; 26: a stator portion; 29: a coil; 29c: a coil wire; 30: a pump mechanism; 40: a housing; 50: a circuit board; 61: a fixed part; 90: a coil guide; 91: a guide body; 99h: a through hole; 92: a support portion; 93: sewing; 93e: end sewing; 94: a leg portion; 94t: a fixing claw; 95: a coil holding member; 96s: a shaft portion; 97: inner side a fixed part; 98: a coil guide; 99: a holding section; 99t: a pressing part; 100: a coil guide groove; 101: a first guide surface; 102: a second guide surface; 103: an arc-shaped guide surface; j1: a central axis.

Detailed Description

In the following description, the direction in which the Z axis shown in each drawing extends is referred to as the vertical direction, the side (+ Z side) of the Z axis toward which the arrow points is referred to as the "upper side", and the side opposite to the side (Z side) of the Z axis toward which the arrow points is referred to as the "lower side". The central axis J1 shown in the following drawings is an imaginary axis extending parallel to the Z axis. Unless otherwise specified, a direction parallel to the axial direction of the central axis J1, i.e., the Z-axis direction, is simply referred to as the "axial direction", a radial direction about the central axis J1 is simply referred to as the "radial direction", and a circumferential direction about the central axis J1 is simply referred to as the "circumferential direction". A direction closer to the central axis J1 in the radial direction is referred to as a radially inner side, and a direction farther from the central axis J1 in the radial direction is referred to as a radially outer side. In the present embodiment, the "parallel direction" includes a substantially parallel direction, and the "perpendicular direction" includes a substantially perpendicular direction. In the present embodiment, the upper side corresponds to the "one axial side", and the lower side corresponds to the "other axial side".

The vertical direction, the upper side, and the lower side are only names for describing the relative positional relationship of the respective parts, and the actual arrangement relationship and the like may be an arrangement relationship other than the arrangement relationship and the like indicated by these names.

The pump 10 of the present embodiment shown in fig. 1 is, for example, an electric pump mounted on a vehicle. The pump 10 delivers fluid within the interior of the vehicle. The fluid delivered by the pump 10 is, for example, oil. The oil is, for example, ATF (Automatic Transmission Fluid). As shown in fig. 1 and 2, the pump 10 of the present embodiment includes a motor 20, a pump mechanism 30, a housing 40, a circuit board 50, a cover 60, and a coil guide 90.

As shown in fig. 2, in the present embodiment, the motor 20, the pump mechanism 30, and the circuit board 50 are housed in the case 40. The housing 40 includes a housing body 41, a flange 42, and a mounting surface 48.

The housing body 41 includes the motor housing 15, the pump housing 16, the substrate housing 17, and the pump cover 13. In the present embodiment, the motor housing 15, the pump housing 16, and the substrate housing 17 are part of a single component that is identical to each other.

In the present embodiment, the motor housing 15 has a cylindrical shape extending in the axial direction. The motor housing 15 is disposed between the pump housing 16 and the substrate housing 17 in the axial direction. The motor housing 15 has a motor housing recess 41a opened vertically. The motor 20 is housed radially inside the motor housing recess 41a.

The pump housing 16 is connected to the underside of the motor housing 15. The pump housing 16 has a pump housing recess 41e formed of a recess opened on the lower side. The opening on the lower side of the pump housing recess 41e is closed by the pump cover 13. The pump mechanism 30 is housed radially inside the pump housing recess 41e.

The pump cover 13 has a cylindrical projection 44 extending in the axial direction. The projection 44 extends downward from the bottom of the pump housing 13. The protruding portion 44 extends in the axial direction centering on the second central axis J2. The second central axis J2 of the projection 44 is arranged at a position radially offset from the central axis J1. The second central axis J2 and the central axis J1 extend parallel to each other.

The protrusion 44 has an inflow port 44a. The inlet 44a is connected to the internal space of the pump housing recess 41e. The inlet 44a is a through hole penetrating the pump cover 13 in the axial direction. The inlet port 44a supplies oil to the pump mechanism 30. That is, the pump mechanism 30 sucks in oil from the outside of the apparatus via the inflow port 44a. The pump housing 13 includes an outflow port not shown. The pump mechanism 30 causes oil to flow out of the outflow port.

The flange portion 42 extends radially outward from the outer peripheral surface of the housing body portion 41. The plurality of flange portions 42 are provided at intervals in the circumferential direction. The flange portion 42 has a mounting hole 42h and an end face 42a facing downward. The end surface 42a is flat extending in a direction perpendicular to the central axis J1. The end face 42a contacts a portion to which the pump 10 is attached. The mounting hole 42h axially penetrates the flange portion 42. The mounting holes 42h are disposed in the respective flange portions 42. A screw member, not shown, for fixing to a mounting target portion of the pump 10 is inserted into the mounting hole 42 h.

As shown in fig. 2, the housing body 41 has a through hole 41c axially connecting the inside of the motor housing recess 41a and the inside of the pump housing recess 41e. An oil seal 43 for sealing between an inner peripheral surface of the through hole 41c and an outer peripheral surface of the shaft 22, which will be described later, is held in the through hole 41c.

The motor 20 is housed in the motor housing recess 41a. The motor 20 has: a rotor portion 21 having a shaft 22 extending along the central axis J1; and a stator portion 26.

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

Rotor core 23 is fixed to the outer peripheral surface of shaft 22. The rotor core 23 is annular with the center axis J1 as the center. The rotor core 23 has a cylindrical shape extending in the axial direction. The rotor core 23 is formed by laminating a plurality of electromagnetic steel plates in the axial direction, for example.

Stator 26 is disposed radially outward of rotor 21, and faces rotor 21 with a gap therebetween in the radial direction. That is, the stator portion 26 and the rotor portion 21 are radially opposed to each other. The stator portion 26 surrounds the rotor portion 21 from the radially outer side over the entire circumference in the circumferential direction. As shown in fig. 2 and 3, the stator portion 26 includes a stator core 27 and a plurality of coils 29.

The stator core 27 has a ring shape centered on the central axis J1. The stator core 27 surrounds the rotor portion 21 from the radially outer side. The stator core 27 is disposed radially outside the rotor portion 21, and faces the rotor portion 21 with a gap therebetween in the radial direction. The stator core 27 is formed by laminating a plurality of electromagnetic steel plates in the axial direction, for example.

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 with a center axis as a center. The core back 27a has a cylindrical shape extending in the axial direction. The radially outer side surface of the core back 27a is fixed to the inner peripheral surface of the case 40. The core back 27a is fitted into the case 40. The teeth 27b extend radially inward from the radially inner surface of the core back 27 a. The plurality of teeth 27b are arranged on the radially inner surface of the core back 27a at intervals in the circumferential direction.

The plurality of coils 29 are attached to the stator core 27 via an insulator 28. That is, the plurality of coils 29 are attached to the stator core 27 via the insulator 28. The insulator 28 has a portion covering the teeth 27b. The material of the insulating member 28 is, for example, an insulating material such as resin. The plurality of coils 29 are each formed by winding a coil wire 29c around each tooth 27b with an insulator 28 interposed therebetween.

The motor 20 of the present embodiment is a three-phase motor. The plurality of coils 29 include U-phase, V-phase, and W-phase coils. Each coil 29 is connected to a portion corresponding to any one of the U-phase, V-phase, and W-phase of the circuit board 50. Each coil 29 includes a winding portion 29a, a crossover portion 29b, and a coil wire 29c. The winding portion 29a is a portion configured by winding a wire (wire) around a part of the stator core 27. The transition wire portion 29b is a portion connecting the plurality of winding portions 29a between the coils 29 of the same phase. The coil wire 29c is drawn upward from the winding portion 29a and is connected to the circuit board 50 via a coil guide 90 described later.

As shown in fig. 2, the pump mechanism 30 is driven by the motor 20. The pump mechanism 30 is disposed below the stator 26. The pump mechanism 30 is connected to the rotor portion 21. In the present embodiment, the pump mechanism 30 has a trochoid pump configuration. The pump mechanism 30 has an inner rotor 30a and an outer rotor 30b located radially outside the inner rotor 30 a. 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 have trochoid tooth profiles, respectively. The inner rotor 30a is fixed to the other axial end of the shaft 22. Thus, the pump mechanism 30 is driven by rotating the inner rotor 30a together with the shaft 22.

The substrate case 17 is located at an upper end of the case body 41. The substrate case 17 has a cylindrical shape centered on the central axis J1. The substrate case 17 has a housing recess 41k formed of a recess opened at least at the upper side. A substrate support surface 17g is provided on the inner peripheral surface of the housing recess 41k. The substrate support surfaces 17g are provided in plurality at intervals in the circumferential direction. The substrate support surface 17g is perpendicular to the axial direction and faces downward. The circuit board 50 is supported by the substrate support surface 17g and is accommodated in the accommodation recess 41k of the substrate case 17.

A connector portion 80 is provided on the upper side of the housing 40. The connector portion 80 is provided on the radially outer surface of the substrate case 17. The connector portion 80 protrudes radially outward from the substrate case 17. A connector portion 80 is connected to the circuit board 50, and the connector portion 80 is connected to an external power supply, for example. Thereby, the circuit board 50 can supply the stator portion 26 with the electric power supplied from the connector portion 80.

As shown in fig. 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 has a plate shape with its plate surface facing in the axial direction. The circuit board 50 is located on one axial side of the motor 20. The circuit board 50 is supported by the plurality of substrate support surfaces 17g from the other axial side, and is fixed to the plurality of substrate support surfaces 17g by screws. Thereby, the circuit board 50 is supported by the housing 40.

The tip of the coil wire 29c of the coil 29 constituting the stator portion 26 is electrically connected to the circuit board 50. As shown in fig. 4, in the present embodiment, on the circuit board 50, the coil wires 29c of the stator portion 26 are connected to 3 locations spaced apart in the circumferential direction at the outer peripheral portion of the circuit board 50. Two coil wires 29c are disposed at respective portions of 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.

As shown in fig. 2, the inverter portion 52 is electrically connected to the motor 20. The inverter portion 52 is mounted on the base material 55 of the circuit board 50. In the present embodiment, the inverter portion 52 is attached to the lower surface 55b on the other axial side of the base material 55. The inverter section 52 includes a plurality of FETs 52a. The FET 52a is, for example, a field effect transistor. 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.

The processor, not shown, is electrically connected to the inverter unit 52. The processor is mounted on a lower surface 55b of the base 55 at a position different from the inverter portion 52. The processor controls energization to the inverter section 52.

As shown in fig. 2 and 4, the capacitor 57 and the inductor 58 are disposed on the other side (+ Y side) in the Y direction with respect to the central axis J1. The capacitor 57 is an electronic component mounted on the upper surface 55a of the substrate 55 on one axial side. The capacitor 57 has a cylindrical shape protruding upward from the circuit board 50. The capacitor 57 is electrically connected to the inverter section 52 via the circuit board 50.

The inductor 58 is mounted on the upper surface 55a of the base material 55. The inductor 58 is used for boosting the power supplied from the outside to the pump 10. The inductor 58 is electrically connected to the inverter section 52 via the circuit board 50. Thereby, the capacitor 57 and the inductor 58 are electrically connected to the stator portion 26 via the circuit board 50, the inverter portion 52, and the coil wire 29c.

The capacitor 57 has a larger protruding dimension from the circuit board 50 toward the upper side (one axial side) than the inductor 58. That is, the capacitor 57 is a component having a height higher than that of the inductor 58. The upper front end surface 57t of the capacitor 57 is arranged near the mounting surface 48 in the axial direction.

In the present embodiment, a heat dissipation material 70 is provided on the upper side of the circuit board 50. The heat dissipating material 70 covers at least a part of the circuit board 50 in a sheet shape along an XY plane perpendicular to the axial direction. In the present 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 disposed on the upper surface 55a of the base material 55 of the circuit board 50.

In the present embodiment, the inverter unit 52 and the processor (not shown) are heat generating components that generate heat when the pump is driven. The heat sink 70, the inverter 52, and the processor (not shown) are disposed on the opposite side in the axial direction with the circuit board 50 interposed therebetween. The heat dissipating material 70 is provided at a position overlapping the inverter portion 52 and the processor (not shown) as heat generating components mounted on the circuit board 50 when viewed from the axial direction. As shown in fig. 2, the heat sink 70 is closely attached to 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, an adhesive, or the like.

As shown in fig. 1 and 2, the cover 60 is disposed above the housing 40. The cover 60 closes the housing recess 41k of the substrate case 17 from above. In the present embodiment, the cover 60 is fixed to the mounting surface 48 located at the upper end of the housing 40. In the present embodiment, the mounting surface 48 is provided at an upper end of the board case 17. The mounting surface 48 is formed in a ring shape that is continuous in the circumferential direction on the radially outer side of the accommodation recess 41k when viewed in the axial direction.

The cover 60 is formed by bending a metal plate into a predetermined shape as described below by press working. The cover 60 has a fixing portion 61, a cover concave portion 62, a cover convex portion 63, a first rib 64, and a second rib 65. The cover 60 has an external shape matching the upper end of the housing main body 41 (substrate housing 17) when viewed in the axial direction.

The fixing portion 61 is provided continuously in the circumferential direction at the outer peripheral 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. Thus, the cover 60 is fixed to the mounting surface 48 of the board housing 17, and closes the housing recess 41k from above.

The cover recess 62 is located radially inward of the fixing portion 61. The cover recess 62 is recessed downward (axially on the other side) with respect to the fixing portion 61. In the present embodiment, the cover recess 62 is located on one side (the Y side) in the Y direction with respect to the center axis J1 in a state where the cover 60 is attached to the attachment surface 48.

The cover recess 62 has a bottom surface 62b, an inclined surface 62s, and a coupling inclined surface 62j. The bottom surface 62b is a surface perpendicular to the axial direction. The surface of the lower side of the bottom surface 62b is in contact with the heat dissipation material 70. The inclined surface 62s is provided radially outward of the bottom surface 62 b. The inclined surface 62s is inclined upward from the bottom surface 62b toward the radially outer side, and is connected to the fixing portion 61. The coupling inclined surface 62j is a surface provided at a portion adjacent to the hood convex portion 63. The coupling inclined surface 62j is a surface inclined upward from the bottom surface 62b toward the convex cover portion 63.

The cover convex portion 63 is provided at a position different from the cover concave portion 62 on the radially inner side of the fixing portion 61. In the present embodiment, the hood-convex portion 63 is located on the other side (+ Y side) in the Y direction with respect to the center axis J1 in a state where the hood 60 is attached to the attachment surface 48. The hood-convex portion 63 protrudes upward relative to the fixing portion 61. The hood-convex portion 63 has a front end surface 63t and an inclined surface 63s.

The front end surface 63t is a surface perpendicular to the axial direction. The inclined surface 63s is provided radially outward of the distal end surface 63t. The inclined surface 63s is inclined downward from the distal end surface 63t toward the radial outer side, and is connected to the fixing portion 61.

The hood-convex portion 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 hood-convex portion 63 when viewed in the axial direction. In the present embodiment, the distal end surface 63t of the convex cover portion 63 and the capacitor 57 are arranged with a space therebetween in the axial direction.

The first rib 64 is provided along the bottom surface 62b of the cover recess 62. In the present embodiment, the distal end surface of the first rib 64 is positioned below the fixing portion 61. That is, the cover 60 has a shape in which the first rib 64 does not protrude from the cover recess 62. The first rib 64 protrudes upward from the bottom surface 62 b. The first rib 64 is provided in a curved surface shape having a predetermined radius of curvature. The first rib 64 extends in a direction along the bottom surface 62 b. In the present embodiment, a plurality of first ribs 64 are provided. In the present embodiment, the first rib 64 includes an inner circumferential rib 64A and an outer circumferential rib 64B. In the present embodiment, the inner peripheral rib 64A is provided on the connection inclined surface 62j side at the bottom surface 62 b. The inner circumferential rib 64A extends along the bottom surface 62b toward the-Y side and is connected to the connection inclined surface 62j.

The outer circumferential rib 64B extends along the bottom surface 62B and is continuous with the inclined surface 62 s. The outer circumferential rib 64B is provided at a position corresponding to the wiring or the electronic component protruding upward from the base material 55. The cover 60 has the outer circumferential rib 64B, and thus can suppress contact with the wiring and the electronic components protruding upward from the base 55.

The second rib 65 is provided on the front end surface 63t of the hood-convex portion 63. The second rib 65 is recessed downward from the front end surface 63t and extends in a groove shape along the front end surface 63t. In the present embodiment, the second ribs 65 are provided at 3 locations, for example. The plurality of second ribs 65 are arranged in the X direction when viewed in the axial direction, and are disposed at positions that do not interfere with the capacitor 57.

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 includes 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.

As shown in fig. 5 and 6, the guide body 91 has an annular shape centered on the central axis J1 when viewed from the axial direction. The guide body 91 integrally has a plate-like portion 91a, an inner circumferential rib 91p, an outer circumferential rib 91q, and a radial rib 91s. The plate-like portion 91a has a plate surface facing in the axial direction. The guide body 91 guides the coil wire 29c led out upward from the coil 29 of the stator 26 radially outward.

The inner circumferential rib 91p, the outer circumferential rib 91q, and the radial rib 91s are provided on the upper surface of the plate-like portion 91a. The inner circumferential rib 91p rises upward from the radially inner circumferential edge portion of the plate-like portion 91a. The inner circumferential rib 91p is provided continuously in the circumferential direction. The outer circumferential rib 91q rises upward from the outer circumferential edge portion on the radially outer side of the plate-like portion 91a. The outer circumferential rib 91q is continuously provided in the circumferential direction. The plurality of radial ribs 91s are provided at intervals in the circumferential direction. Each radial rib 91s stands upward from the plate-like portion 91a, extends continuously in a substantially radial direction along a slit 93 described later, and connects the inner circumferential rib 91p and the outer circumferential rib 91 q. The inner circumferential rib 91p, the outer circumferential rib 91q, and the radial rib 91s reinforce the plate-like portion 91a, thereby increasing the strength of the guide body 91.

The guide body 91 is provided with a support portion 92, a plurality of leg portions 94, and a slit 93.

The plurality of leg portions 94 are provided below the plate-like portion 91a. The plurality of legs 94 are fixed to the stator 26. The guide body 91 is fixed to the stator portion 26 by a plurality of legs 94. The plurality of leg portions 94 are provided at intervals in the circumferential direction of the plate-like portion 91a. Each leg 94 extends downward from the outer peripheral edge of the plate-like portion 91a. The tip 94s of each leg 94 abuts the upper surface 27s of the core back 27a of the stator core 27 facing upward. This restricts downward movement of the guide main body 91. In a state where the tip 92s of each leg 94 abuts against the upper surface 27s, the guide body 91 and the stator portion 26 are provided with a gap in the axial direction.

Further, a fixing claw 94t is provided at a lower end of each leg 94. The fixing claws 94t protrude radially inward. As shown in fig. 8, the fixing claws 94t of the legs 94 are fixed by being hooked in the recesses 28b provided on the radially outer surface of the insulator 28 of the stator portion 26. The fixing claws 94t of the plurality of leg portions 94 are respectively hooked in the recessed portions 28b, thereby restricting the upward movement of the guide main body 91. In addition, when the leg portion 94 is fixed to the stator portion 26 at the time of assembly, the guide body 91 can be easily attached to the stator portion 26.

As shown in fig. 6, the slit 93 is provided in the plate-like portion 91a of the guide main body 91. The slits 93 are provided in plurality at intervals in the circumferential direction. In the present embodiment, two slits 93 are provided at 3 locations in total spaced apart in the circumferential direction. Each slit 93 is recessed in a V-shape or a U-shape from the radially inner peripheral surface of the plate-like portion 91a of the guide body 91 toward the radially outer side. In the present 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 upward from the winding portion 29a of the coil 29 is led out radially outward through the slit 93.

The support portion 92 is provided on the outer circumferential surface of the plate-like portion 91a (guide body 91) on the radially outer side. The support portions 92 are provided in plurality at intervals in the circumferential direction. In the present embodiment, the support portions 92 are provided at 3 locations in total spaced apart in the circumferential direction. The support portion 92 is provided recessed radially inward from the radially outer peripheral surface of the plate portion 91a.

The support portion 92 has a first restriction surface 92a, a second restriction surface 92b, and a third restriction surface 92c. The first restriction surface 92a is a flat surface facing radially outward. The first regulating surface 92a regulates movement of a shaft portion 96s of the coil holding member 95, which will be described later, to the radially inner side. The second limiting surface 92b is a surface that is provided to rise radially outward from an upper end of the first limiting surface 92 a. The second restriction surface 92b faces downward. The second restriction surface 92b restricts the movement of the shaft portion 96s of the coil holding member 95 to the upper side. The third limiting surface 92c is a surface that is provided so as to rise radially outward from both circumferential sides of the first limiting surface 92 a. The third regulating surface 92c regulates the movement of the shaft portion 96s of the coil holding member 95 in the circumferential direction.

The support portion 92 is provided with a notch 91k. The notch 91k is provided by recessing a part of the outer circumferential rib 91q to the other axial side. The notch 91k is provided in the circumferential center of the first regulating surface 92 a.

As shown in fig. 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 3 locations in total spaced apart in the circumferential direction. The coil holding member 95 holds the two coil wires 29c extending radially outward from the pair of slits 93 of the guide main body 91 by being bent upward.

As shown in fig. 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.

The plate portion 96 has a plate shape with a plate surface facing in the axial direction. The plate portion 96 is supported from below by the outer circumferential rib 91q and the inner circumferential rib 91p of the coil holding member 95.

The shaft portions 96s are provided on both sides in the circumferential direction at the end portions radially outside the plate portion 96, respectively. The shaft portion 96s protrudes from the plate portion 96 to both circumferential sides. The shaft portion 96s abuts the support portion 92 of the guide body 91 from the radially outer side. The shaft portion 96s is rotatable about an axis perpendicular to the radial direction and the axial direction in a state where the movement in the circumferential direction is restricted by being sandwiched between the third restricting surfaces 92c on both sides in the circumferential direction, the movement in the radial direction is restricted by the first restricting surface 92a, and the movement in one side in the axial direction is restricted by the second restricting surface 92 b. That is, the shaft portion 96s of the coil holding member 95 is rotatably supported by the support portion 92.

The inner fixing portion 97 is provided at an end portion of the guide body 91 radially inside the plate portion 96. The inner fixing portion 97 extends from the plate portion 96 toward the other axial side. The inner fixing portion 97 extends from the inner peripheral portion of the plate portion 96 toward the other axial side. A fixing hook 97s is provided at an end portion of the lower side of the inner fixing portion 97. The fixing hook 97s has a frame shape. The fixing hook 97s of the inner fixing portion 97 is fixed to a fixing claw provided at the other axial end of the inner peripheral edge portion of the guide main body 91. The shaft portion 96s is supported by the support portion 92, and the inner fixing portion 97 is fixed to the guide body 91, whereby the coil holding member 95 is held by the guide body 91.

As shown in fig. 7, 8, and 9, the coil guide portion 98 bends and guides the two coil wires 29c led out radially outward from the slit 93 upward. The coil guide portions 98 are provided in a groove shape on both sides of the coil holding member 95 in the circumferential direction.

The coil guide 98 includes a pair of coil guide slots 100. Each coil guide groove 100 has a first guide surface 101, a second guide surface 102, and an arc-shaped guide surface 103.

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 below the plate portion 96. The first guide surface 101 extends radially outward from a radially intermediate portion of the bottom surface 96b in the plate portion 96.

The first guide surface 101 is provided with a pressing portion 99t. 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 led out from the slit 93 toward the lower guide body 91.

The arc-shaped guide surface 103 is an arc-shaped surface curved to connect the first guide surface 101 and the second guide surface 102. The arc-shaped guide surface 103 is provided continuously with the first guide surface 101 and the second guide surface 102. The arcuate guide surface 103 is curved around an axis along the shaft portion 96 s. The arc-shaped guide surface 103 is provided with a predetermined radius of curvature.

As described later, the arcuate guide surface 103 of the present embodiment has the following curvature: when the coil holding member 95 is rotated and fixed with respect to the guide main body 91, the coil wire 29c is pressed radially outward to be closely attached, and a restraining force for restraining the coil wire 29c from loosening is generated.

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 in the axial direction.

The coil wire 29c led out from the guide main body 91 through the slit 93 is guided from the lower side to the first guide surface 101 to be guided to the radially outer side, is bent along the arcuate guide surface 103 to be guided to the upper side, and is guided from the radially outer side to the second guide surface 102 to be guided to the upper side. Thus, 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.

The holding portion 99 is provided at the end portion on the outer side in the radial direction 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. Coil wires 29c extending upward from the coil guide grooves 100 of the coil guide portion 98 are inserted into the through holes 99h. The coil wire 29c inserted into the through hole 99h extends upward and is electrically connected to the circuit board 50.

The coil holding member 95 having the above-described structure is attached to the guide main body 91 as follows. As shown in fig. 10, the coil wire 29c drawn out from the coil 29 is led out radially outward through the slit 93. Next, the coil holding member 95 is placed so that the through hole 99h of the holding portion 99 extends in the radial direction, and the coil wire 29c extending outward in the radial direction is inserted into the through hole 99h.

Next, the coil holding member 95 is moved radially inward while the coil wire 29c inserted into the through hole 99h is used as a guide, and the shaft portion 96s is brought into contact with the first regulating surface 92a of the support portion 92.

Next, as shown in fig. 11, the coil holding member 95 is rotated around the shaft portion 96s in a state where the shaft portion 96s is brought into contact with the first and second regulating surfaces 92a and 92b of the support portion 92. Then, the coil wire 29c is bent along the arcuate guide surface 103 of the coil guide groove 100 in a state where the coil wire 29c is held by being inserted into the through hole 99h. At this time, the arcuate guide surface 103 is in close contact with the coil wire 29c so as to press the coil wire radially outward. Thus, the coil wire 29c is placed in a state of being tensioned, and therefore, the coil wire 29c held by the holding portion 99 is bent upward while suppressing the slack of the coil wire 29c.

The coil wire 29c bent along the arcuate guide surface 103 is guided radially outward by coming into contact with the first guide surface 101 from below, and is guided upward by coming into contact with the second guide surface 102 from radially outward. The coil wire 29c is pressed against the guide body 91 by the pressing portion 99t of the coil guide portion 98.

Then, as shown in fig. 9, the plate portion 96 is brought into contact with the guide main body 91 from above, and the inner fixing portion 97 is fixed to the inner peripheral portion of the guide main body 91, thereby completing the attachment of the coil holding member 95 to the guide main body 91.

According to the pump 10 of the present embodiment, the coil wire 29c led out from the coil 29 of the stator portion 26 is guided from the radially outer side to the upper side 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 allows the circumferential position of the coil wire 29c extending upward toward the circuit board 50 to be determined. Further, by bending the coil wire 29c along the coil guide groove 100 of the coil guide portion 98, the coil wire 29c led out from the coil 29 can be given a tension, and the coil wire 29c can be extended upward.

In this way, the coil 29 of the stator portion 26 can be electrically connected to the circuit board 50 without using a bus bar. As a result, the pump 10 can be downsized.

According to the pump 10 of the present embodiment, when the coil holding member 95 supported by the support portion 92 is rotated about the shaft portion 96s in a state where the coil wire 29c is held by the holding portion 99, the coil wire 29c extending radially outward from the guide main body 91 can be bent along the coil guide groove 100 (the arcuate guide surface 103) of the coil guide portion 98 and drawn upward. Thus, the coil wire 29c can be easily connected to the circuit board 50.

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

According to the pump 10 of the present embodiment, the coil wire 29c led out from the coil 29 is pressed by the pressing portion 99t of the coil holding member 95, and thus, the positional displacement of the coil wire 29c can be suppressed by vibration or the like. This reduces the load applied to the connection portion between the coil wire 29c and the circuit board 50.

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

According to the pump 10 of the present embodiment, the introduction position (the extraction position) of the coil wire 29c with respect to the coil guide portion 98 can be stabilized by extracting the coil wire 29c extracted from the coil 29 toward the coil guide portion 98 through the slit 93.

According to the pump 10 of the present 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 disposed in the slit 93 is sandwiched by the slit 93. This can more reliably stabilize the introduction position of the coil wire 29c into the coil guide portion 98.

According to the pump 10 of the present embodiment, since the coil guide 90 has the plurality of leg portions 94, the guide body 91 can be reliably fixed to the stator portion 26. This allows the position of the guide body 91 to be determined with respect to the stator portion 26, and the circumferential position of the coil wire 29c extending upward can be stably determined.

In the present embodiment, the fixing claws 94t of the legs 94 are hooked to the stator 26, whereby the movement of the guide body 91 to the upper side can be restricted. In addition, when assembling, the leg 94 is fixed to the stator 26, whereby the guide body 91 can be easily attached to the stator 26.

According to the pump 10 of the present embodiment, the coil guide 90 is made of a resin material, so that the coil guide 90 can be easily manufactured at low cost. Further, by using an insulating resin material, short-circuiting of the coil wire 29c can be suppressed.

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

The use of the electric pump to which the present invention is applied is not particularly limited. The type of fluid to be delivered by the electric pump is not particularly limited, and may be water or the like. The predetermined object to which the electric pump is attached may be any object. The electric pump may be mounted on a device other than the vehicle. The electric pump may be disposed in any manner with respect to the vertical direction. The center axis of the motor of the electric pump may extend not perpendicularly to the vertical direction but in a direction inclined with respect to the vertical direction, or may extend parallel to the vertical direction. In addition, the structures and the methods described in the present specification can be appropriately combined within a range not inconsistent with each other.

Claims

1. An electric pump having:

a motor having a rotor portion and a stator portion, the rotor portion being rotatable about a central axis extending in an axial direction;

a pump mechanism connected to the rotor portion;

a circuit board disposed on one axial side of the motor;

a housing that houses the motor, the pump mechanism, and the circuit board; and

a coil guide disposed between the stator portion and the circuit board,

the coil guide has:

a guide body fixed to the stator portion and guiding a coil wire led out from the coil of the stator portion to one side in the axial direction to the outside in the radial direction; and

a coil holding member that is disposed on one side in the axial direction with respect to the guide body and that holds the coil wire extending from the guide body to the outside in the radial direction by being bent toward the one side in the axial direction,

the coil holding member includes:

a coil guide portion that guides the coil wire extending from the guide body to the radially outer side to the one side in the axial direction, the coil guide portion 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 that connects the first guide surface and the second guide surface; and

a holding portion that holds the coil wire extending from the coil guide portion to one side in the axial direction,

the coil wire extends from the coil holding member to the one axial side and is electrically connected to the circuit board.

2. The electric pump of claim 1,

the coil holding member includes a shaft portion rotatably supported by a support portion provided at the outer peripheral portion on the radially outer side of the guide body,

the coil holding member bends the coil wire toward the one axial side along the coil guide groove by rotating about the shaft portion in a state where the coil wire drawn out from the guide body to the radial outer side is held by the holding portion.

3. The electric pump according to claim 1 or 2,

the holding portion has a through hole into which the coil wire is inserted.

4. The electric pump according to claim 1 or 2,

the coil guide section has a pressing section that presses the coil wire led out from the coil against the guide body.

5. The electric pump according to claim 1 or 2,

the coil holding member includes an inner fixing portion that is provided on the radially inner side of the guide body, and that extends toward the other axial side to be fixed to the guide body.

6. The electric pump according to claim 1 or 2,

the guide body is annular when viewed from the axial direction,

the guide body has a slit recessed from a radially inner peripheral surface toward a radially outer side,

the coil wire led out from the coil is drawn radially outward through the slit and held by the coil holding member.

7. The electric pump of claim 6,

the width of the slit end on the radially outer side of the slit is smaller than the outer diameter of the coil wire.

8. The electric pump according to claim 1 or 2,

the coil guide has a plurality of leg portions extending from the guide body to the other axial side and fixed to the stator portion.

9. The electric pump of claim 8,

the plurality of leg portions are respectively provided with a fixing claw,

the plurality of legs are fixed to the stator portion by hooking the fixing claws to a radially outer side of the stator portion.

10. The electric pump according to claim 1 or 2,

the coil guide is made of a resin material.