JP7643138B2 - Electric pump - Google Patents

Description

The present invention relates to an electric pump.

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 three-phase AC current to the coil of the stator via a bus bar, thereby rotating the rotor.

JP 2019-75872 A

In the electric pump described above, the bus bar is disposed between the stator of the motor and the control unit. This requires securing space between the stator of the motor and the control unit to accommodate the bus bar, which may lead to an increase in the size of the electric pump.

In view of the above, one of the objectives of the present invention is to provide an electric pump that can be made smaller.

One aspect of the electric pump of the present invention comprises 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 comprising a guide body that is fixed to the stator portion and that guides the coil wire led out from the 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 that guides the coil wire led out from the guide body to the one radial side. and a coil holding member that holds the coil wire extending outward by bending it to one side in the 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 that connects the first guide surface and the second guide surface, a coil guide portion that guides the coil wire extending radially outward from the guide body to one side in the axial direction, 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 extending from the coil holding member to one side in the axial direction being electrically connected to the circuit board.

According to one aspect of the present invention, an electric pump that can be made compact is provided.

FIG. 1 is a perspective view showing a pump according to an embodiment. FIG. 2 is a vertical cross-sectional view of a pump according to an embodiment. FIG. 3 is a perspective view showing a stator portion provided in the pump of the embodiment. FIG. 4 is a plan view of a circuit board provided in the pump of one embodiment. FIG. 5 is a perspective view of a stator portion and a coil guide according to one embodiment. FIG. 6 is a perspective view of a guide body of a coil guide according to one embodiment. FIG. 7 is a perspective view of a coil holding member of a coil guide according to one embodiment. FIG. 8 is a perspective view of the coil holding member of the embodiment, seen from a different direction than that of FIG. 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. FIG. 10 is a perspective view showing a state in which a coil wire is passed through a coil holding member of the embodiment. FIG. 11 is a perspective view illustrating a state in which the coil holding member of the embodiment is raised.

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".

Note that the terms "upper side," "upper side," and "lower side" 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.

The pump 10 of this embodiment shown in FIG. 1 is, for example, an electric pump mounted on a vehicle. The pump 10 pumps 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.

As shown in FIG. 2, in this embodiment, the motor 20, the pump mechanism 30, and the circuit board 50 are housed in a housing 40. The housing 40 has a housing body portion 41, a flange portion 42, and a mounting surface 48.

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 all part of the same single member.

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 housing recess 41a that opens upward and downward. The motor 20 is housed radially inside the motor housing recess 41a.

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 that 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 radially inside the pump accommodating recess 41e.

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 centered on the second central axis J2. The second central axis J2 of the protrusion 44 is disposed 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 inlet 44a. The inlet 44a is connected to the internal space of the pump accommodating recess 41e. The inlet 44a is formed by 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 oil to flow out from the outlet.

The flange portion 42 extends radially outward from the outer peripheral surface of the housing body portion 41. A plurality of flange portions 42 are provided at intervals from each other 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 the mounting target portion of the pump 10. The mounting hole 42h penetrates 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 the mounting target portion.

As shown in FIG. 2, the housing body 41 has a through hole 41c that axially connects the inside of the motor accommodating recess 41a and the inside of the pump accommodating recess 41e. An oil seal 43 is held within 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.

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 around the central axis J1. The shaft 22 is rotatable around the central axis J1. The 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 that supports 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).

The rotor core 23 is fixed to the outer peripheral surface of the shaft 22. The rotor core 23 is annular about the central axis J1. The rotor core 23 is cylindrical and extends in the axial direction. The rotor core 23 is formed, for example, by stacking multiple electromagnetic steel plates in the axial direction.

The stator portion 26 is disposed radially outside the rotor portion 21 and faces the rotor portion 21 with a radial gap therebetween. In other words, the stator portion 26 faces the rotor portion 21 in the radial direction. The stator portion 26 surrounds the rotor portion 21 from the radial outside over the entire circumferential circumference. As shown in Figures 2 and 3, the stator portion 26 has a stator core 27 and multiple coils 29.

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 multiple electromagnetic steel plates in the axial direction.

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

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.

The motor 20 of this embodiment is a three-phase motor. The multiple 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 jumper 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 jumper portion 29b is a portion that connects the multiple 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 below.

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 other axial end of the shaft 22. In this way, the pump mechanism 30 is driven by the inner rotor 30a rotating together with the shaft 22.

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 to the upper side. A board support surface 17g is provided on the inner peripheral 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 supported by the board support surface 17g and accommodated in the accommodating recess 41k of the board housing 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 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, for example, to an external power source. This allows the circuit board 50 to supply power supplied from the connector portion 80 to the stator portion 26.

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 in the form of a plate 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.

The ends of the coil wires 29c of the coils 29 that constitute the stator section 26 are electrically connected to the circuit board 50. As shown in FIG. 4, in this embodiment, the coil wires 29c of the stator section 26 are 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 arranged at each location on the circuit board 50. Each coil wire 29c is part of a coil 29 for either the U-phase, V-phase, or W-phase.

As shown in FIG. 2, the inverter unit 52 is electrically connected to the motor 20. The inverter unit 52 is attached to the base material 55 of the circuit board 50. In this embodiment, the inverter unit 52 is attached to the 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.

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 the inverter unit 52. The processor controls the supply of electricity to the inverter unit 52.

As shown in Figures 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 the upper surface 55a on one axial side of the substrate 55. The capacitor 57 is cylindrical and protrudes 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 attached to the upper surface 55a of the base material 55. The inductor 58 is used to boost the power supplied from an external source to the pump 10. The inductor 58 is electrically connected to the inverter section 52 via the circuit board 50. As a result, the capacitor 57 and the inductor 58 are electrically connected to the stator section 26 via the circuit board 50, the inverter section 52, and the coil wire 29c.

Compared to the inductor 58, the capacitor 57 has a larger protruding dimension from the circuit board 50 upward (to one axial direction). In other words, the capacitor 57 is a component that is taller than the inductor 58. The upper end surface 57t of the capacitor 57 is located near the mounting surface 48 in the axial direction.

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

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 is disposed on the opposite axial side of the circuit board 50 from the inverter unit 52 and the processor (not shown). The heat dissipation material 70 is disposed at a position that overlaps with 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.

As shown in Figures 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 substrate housing 17 from above. In this embodiment, the cover 60 is fixed to the 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 substrate housing 17. When viewed in the axial direction, the mounting surface 48 is annular and continues in the circumferential direction radially outside the accommodating recess 41k.

The cover 60 is constructed 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 from the axial direction, the cover 60 has an outer shape that matches the upper end of the housing main body 41 (substrate housing 17).

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

The cover recess 62 is located radially inward of the fixed portion 61. The cover recess 62 is recessed downward (the other axial side) relative to the fixed portion 61. In this embodiment, the cover recess 62 is located on one side in the Y direction (-Y side) relative to the central axis J1 when the cover 60 is attached to the mounting surface 48.

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 radially outward from the bottom surface 62b. The inclined surface 62s inclines upward from the bottom surface 62b radially outward, 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 that inclines upward from the bottom surface 62b toward the cover protrusion 63.

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

The tip surface 63t is a surface perpendicular to the axial direction. The inclined surface 63s is provided radially outward from the tip surface 63t. The inclined surface 63s inclines downward from the tip surface 63t radially outward and is connected to the fixing portion 61.

The cover protrusion 63 is arranged to cover the capacitor 57 of the circuit board 50. That is, the capacitor 57 is arranged 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 arranged with a gap in the axial direction between it and the capacitor 57.

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 radius of curvature. 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.

The outer rib 64B extends along the bottom surface 62b and continues to the inclined surface 62s. The outer 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 rib 64B, the cover 60 can prevent contact with the wiring and electronic components protruding upward from the base material 55.

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 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 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.

As shown in Figures 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 outward from the coil 29 of the stator portion 26 radially outward.

The inner rib 91p, the outer rib 91q, and the radial rib 91s are provided on the surface facing the upper side of the plate-shaped portion 91a. The inner rib 91p rises upward from the inner peripheral edge portion on the radial inside of the plate-shaped portion 91a. The inner rib 91p is provided continuously in the circumferential direction. The outer rib 91q rises upward from the outer peripheral edge portion on the radial outside of the plate-shaped portion 91a. The outer 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 the slit 93 described later to connect the inner rib 91p and the outer rib 91q. The inner rib 91p, the outer rib 91q, and the radial rib 91s reinforce the plate-shaped portion 91a, increasing the strength of the guide body 91.

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 in the axial direction between the guide body 91 and the stator portion 26.

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 hooking it into a recess 28b provided on the radially outer surface of the insulator 28 of the stator part 26. The fixing claws 94t of the multiple legs 94 are each hooked into the recess 28b, thereby restricting the upward movement of the guide body 91. Furthermore, by fixing the legs 94 to the stator part 26 during assembly, the guide body 91 can be easily attached to the stator part 26.

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 three locations spaced apart in the circumferential direction, with two slits in each location. Each slit 93 is recessed in a V-shape or U-shape from the inner peripheral 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 radially outer slit end 93e 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 slits 93.

The support portion 92 is provided on the outer peripheral surface on the radially outer side of the plate-shaped portion 91a (guide 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.

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 the shaft portion 96s of the coil holding member 95 described later. The second restricting surface 92b is a surface provided so as to rise radially outward from the upper end 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.

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

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 upward and hold the two coil wires 29c extending radially outward from a pair of slits 93 of the guide body 91.
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.

The plate portion 96 is shaped like a plate with a plate surface facing the axial direction, and is supported from below by an outer peripheral rib 91q and an inner peripheral rib 91p of the coil holding member 95.
The shaft portion 96s is provided on both sides in the circumferential direction at the radially outer end of the plate portion 96. The shaft portion 96s protrudes from the plate portion 96 on both sides in the circumferential direction. 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 direction and the axial direction in a state in which the shaft portion 96s is sandwiched between the third restricting surfaces 92c on both sides in the circumferential direction 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 to one side in the axial direction. In other words, 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 the 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. The inner fixing portion 97 extends from the inner circumferential portion of the plate portion 96 to the other axial direction. A fixed hook 97s is provided at the lower end of the inner fixing portion 97. The fixed hook 97s is frame-shaped. The fixed hook 97s of the inner fixing portion 97 is fixed to a fixed claw provided at the 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.

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

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.

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 underside of the plate portion 96. The first guide surface 101 extends radially outward from the radial middle portion of the bottom surface 96b of the plate portion 96.

The first guide surface 101 is provided with a pressing portion 99t. That is, the coil guide portion 98 has a 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 lower guide body 91.

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

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 along the axial direction on the radially outer surface of the plate portion 96.

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, 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.

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

Next, as shown in FIG. 11, the coil holding member 95 is rotated around the shaft 96s with the shaft 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 make close contact. This applies tension 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.

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.

Then, as shown in FIG. 9, the plate portion 96 is brought into contact with 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.

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, thereby making it possible to reduce the size of the pump 10.

According to the pump 10 of this embodiment, when the coil holding member 95 supported by the support portion 92 is rotated around the shaft portion 96s while the coil wire 29c is 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 way, the coil wire 29c can be easily connected to the circuit board 50.

According to the pump 10 of this embodiment, the coil wire 29c can be inserted into the through hole 99h of the coil holding member 95, so that the circumferential position of the coil wire 29c connected to the circuit board 50 can be determined more stably.

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 between the coil wire 29c and the circuit board 50.

According to the pump 10 of this 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 this embodiment, the coil wire 29c derived from the coil 29 is pulled out toward the coil guide portion 98 through the slit 93, so that the introduction position (pulling out position) of the coil wire 29c relative to the coil guide portion 98 can be stabilized.

In the pump 10 of this embodiment, the width of the slit end 93e of the slit 93 is smaller than the outer diameter of the coil wire 29c, so 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 relative to the coil guide portion 98.

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.
In this embodiment, the upward movement of the guide body 91 can be restricted by hooking the fixing claws 94t of the legs 94 onto the stator portion 26. 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.

According to the pump 10 of this embodiment, the coil guide 90 is made of a resin material, so that the coil guide 90 can be manufactured easily and at low cost. In addition, by using an insulating resin material, short circuits of the coil wire 29c can be suppressed.

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.

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 combined as appropriate within a range that does not contradict each other.

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...center axis.

Claims (10)

a motor having a rotor portion and a stator portion rotatable about a central axis extending in an axial direction;
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
a guide body fixed to the stator portion and configured to guide a coil wire led from the coil of the stator portion to one side in the axial direction, radially outward;
a coil holding member that is disposed on one axial side of the guide body and that holds the coil wire extending radially outward from the guide body by bending the coil wire to the one axial side;
having
The coil holding member is
a 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 that guides the coil wire extending radially outward from the guide body to one side in the axial direction;
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 one side in the axial direction and is electrically connected to the circuit board. the coil holding member includes a shaft portion rotatably supported by a support portion provided on an outer periphery of the guide body on the radially outer side,
2. The electric pump according to claim 1, wherein the coil holding member is rotated around the shaft portion while holding the coil wire pulled out radially outward from the guide body in the holding portion, thereby bending the coil wire to one side in the axial direction along the coil guide groove. The electric pump according to claim 1 , wherein the holding portion has a through hole into which the coil wire is inserted. The electric pump according to claim 1 , wherein the coil guide portion has a pressing portion that presses the coil wire led out from the coil against the guide body. The electric pump according to claim 1 , wherein the coil holding member has an inner fixing portion that is provided radially inward of the guide body, extends to the other axial side, and is fixed to the guide body. 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 electric pump according to claim 1 , wherein the coil wire is led out from the coil through the slit and pulled out radially outwardly and held by the coil holding member. The electric pump according to claim 6 , wherein a width of the radially outer slit end of the slit is smaller than an outer diameter of the coil wire. The coil guide is
The electric pump according to claim 1 , further comprising a plurality of legs extending from the guide body to the other axial direction side and fixed to the stator portion. 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 . The electric pump according to claim 1 , wherein the coil guide is made of a resin material.

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