CN217558539U - Electric pump - Google Patents

Abstract

The utility model discloses a mode of electric pump possesses: a motor having a rotor rotatable about a central axis extending in an axial direction; a pump mechanism connected to the rotor; a circuit board disposed on one axial side of the motor; a housing for accommodating the motor, the pump mechanism and the circuit board; a cover mounted on one axial side of the housing and closing an opening for accommodating the circuit board; and a connector portion provided to the housing and connected to the circuit board. The connector portion has: a connector housing retained to the housing; a connector connecting portion provided in the connector housing and detachably connected to the external connector; and a communication hole provided in the connector housing and communicating the inside of the housing with the outside. The communication hole includes: a first aperture extending from within the housing in a first direction; and a second hole extending from inside the connector connecting portion in a second direction crossing the first direction and connected to the first hole.

Description

Electric pump

Technical Field

The utility model relates to an electric pump.

Background

Patent document 1 describes the following structure: a connector portion having a plurality of connector pins is provided on a housing main body of a housing that houses a motor portion of an electric pump. In this structure, the connector portion has a communication hole that communicates the inside and the outside of the housing. The increase or decrease of the internal pressure of the housing is suppressed by allowing air to flow between the inside and the outside of the housing through the communication hole.

Documents of the prior art

Patent document

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

In the electric pump as described above, the communication hole provided in the connector portion may be opened upward outside the housing main body depending on the orientation of the mounted state of the electric pump. Then, water or dust may enter the housing through the communication hole from the outside of the housing. When water or dust comes into contact with an electrical component housed in the housing, there is a possibility of causing an electrical short circuit.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide an electric pump capable of suppressing the intrusion of water or dust from the outside.

The utility model discloses a mode of electric pump possesses: a motor having a rotor rotatable about a central axis extending in an axial direction; a pump mechanism coupled to the rotor; a circuit board provided on one axial side of the motor; a housing that houses the motor, the pump mechanism, and the circuit board; a cover mounted on one side of the housing in the axial direction and closing an opening for accommodating the circuit board; and a connector portion provided on the housing and connected to the circuit board, the connector portion including: a connector housing retained to the housing; a connector connecting portion provided in the connector housing and detachably connected to an external connector; and a communication hole provided in the connector housing and communicating an inside of the housing with an outside, the communication hole including: a first aperture extending from within the housing in a first direction; and a second hole extending from inside the connector connecting portion in a second direction intersecting the first direction and connected to the first hole.

(Utility model effect)

According to an aspect of the present invention, there is provided an electric pump capable of suppressing intrusion of water and dust from the outside.

Drawings

Fig. 1 is a perspective view showing an electric pump device according to an embodiment.

Fig. 2 is a longitudinal sectional view of an electric pump device according to an embodiment.

Fig. 3 is a perspective view showing a mounting structure of a connector portion of an electric pump device to a housing according to an embodiment.

Fig. 4 is a perspective view showing a connector portion of an embodiment.

Fig. 5 is a longitudinal sectional view of a connector portion of an embodiment.

Fig. 6 is a longitudinal sectional view of a connector portion in a modification of the embodiment.

Detailed Description

In the following description, the direction in which the Z axis extends shown in each drawing is referred to as the vertical direction, and the side (+ Z side) toward which the arrow on the Z axis faces is referred to as the "upper side", and the side opposite to the side (Z side) toward which the arrow on the Z axis faces 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". In the radial direction, a direction approaching the central axis J1 is referred to as a radially inner side, and a direction away from the central axis J1 is referred to as a radially outer side. In the present embodiment, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal 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 relative positional relationships 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 vehicle interior. 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 connector unit 80.

As shown in fig. 2, in the present embodiment, the motor 20, the pump mechanism 30, and the circuit board 50 are housed in a case 40. The housing 40 has a housing main body portion 41, a flange portion 42, a mounting surface 48, and a connector mounting hole 49.

The housing main body portion 41 has a motor housing 15, a pump housing 16, a substrate housing 17, and a 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 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 axially between the pump housing 16 and the base housing 17. 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 opening downward. 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 cover 13. The projection 44 extends in the axial direction about 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 protruding portion 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 formed by a through hole that penetrates the pump cover 13 in the axial direction. The inlet port 44a allows oil to flow into the pump mechanism 30. That is, the pump mechanism 30 sucks in oil from the outside of the apparatus through the inflow port 44a. The pump cover 13 includes an unillustrated outflow port. 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 an end surface 42a facing downward and a mounting hole 42h. The end surface 42a is a flat surface extending in a direction orthogonal 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 42h.

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 that seals between an inner peripheral surface of the through hole 41c and an outer peripheral surface of a shaft 22 described later is held in the through hole 41c.

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

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 connected 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. Rotor core 23 has a cylindrical shape extending in the axial direction. The rotor core 23 is formed by, for example, laminating a plurality of electromagnetic steel plates in the axial direction.

Stator 26 is disposed radially outward of rotor 21, and faces rotor 21 with a gap in the radial direction. That is, the stator portion 26 and the rotor portion 21 are opposed to each other in the radial direction. The stator portion 26 surrounds the rotor portion 21 from the radially outer side over the entire circumference in the circumferential direction. The stator portion 26 has 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 outward of 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.

The stator core 27 has a coil 29. Although not shown, the coil 29 is attached to the stator core through an insulator. The coil 29 has a lead-out portion 29c connected to the circuit board 50. The lead wire portion 29c is led upward from the coil 29 and is connected to the circuit board 50 via a coil wire guide 90 described later.

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 the present 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 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 the rotation of the inner rotor 30a together with the shaft 22.

The board housing 17 is located at an upper end of the housing body 41. The substrate case 17 is cylindrical with the center axis J1 as the center. The substrate case 17 has a housing recess 41k formed of a recess opening at least to the upper side. The 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 faces downward and is perpendicular to the axial direction. The circuit board 50 is supported by the board support surface 17g and is accommodated in the accommodation recess 41k of the board housing 17.

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

As shown in fig. 2 and 3, a connector portion 80 is provided on one axial side of the housing 40. The connector portion 80 is attached to the housing 40 through a connector attachment hole 49 provided on the radially outer side surface of the substrate housing 17. The connector portion 80 is connected to the circuit board 50, for example, to an external power supply. Thus, the circuit board 50 can supply the power supplied from the connector portion 80 to the stator portion 26.

The circuit board 50 of the present embodiment includes a base 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 a 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 board support surfaces 17g from the other axial side, and is fixed to the plurality of board support surfaces 17g by screws. Thereby, the circuit substrate 50 is supported by the housing 40. The leading end of the lead portion 29c of the coil 29 constituting the stator portion 26 is electrically connected to the circuit board 50.

A coil wire guide 90 is provided on the lower side of the circuit board 50. The coil wire guide 90 holds the lead-out wire portions 29c extending from the coil 29 toward one axial side. The coil wire guide 90 is annular with the center axis J1 as the center. The coil wire guide 90 is made of an insulating resin material.

The inverter unit 52 is electrically connected to the motor 20. As shown in fig. 2 and 3, the inverter unit 52 is mounted on a 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 FET52a is, for example, a field effect transistor. The inverter portion 52 is electrically connected to the stator portion 26 via the lead portion 29c of the coil 29 connected to the circuit substrate 50.

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

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 on one axial side of the base material 55. The capacitor 57 has a cylindrical shape protruding upward from the circuit board 50. The capacitor 57 is electrically connected to the inverter unit 52 via the circuit board 50.

The inductor 58 is mounted on the upper surface 55a of the substrate 55. The inductor 58 is used to boost the power supplied from the outside to the pump 10. The inductor 58 is electrically connected to the inverter unit 52 via the circuit board 50. Thus, 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 lead portion 29c.

In the present embodiment, a heat dissipating material 70 is provided on the upper side of the circuit board 50. The heat dissipating material 70 is in the form of a sheet along an XY plane orthogonal to the axial direction, and covers at least a part of the circuit board 50. 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 provided 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 is disposed on the opposite side in the axial direction from the inverter portion 52 and the processor (not shown) with the circuit board 50 interposed therebetween. The heat dissipating member 70 is provided at a position overlapping the inverter unit 52 and a processor (not shown) as heat generating components mounted on the circuit board 50 when viewed from the axial direction. The heat dissipating material 70 is in close contact with the upper surface 55a of the base material 55 of the circuit substrate 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 at the end on the upper side of the housing 40. In the present embodiment, the mounting surface 48 is provided at the upper end of the board housing 17. The mounting surface 48 is formed in a ring shape that is continuous in the circumferential direction on the outer side in the radial direction of the housing recess 41k when viewed in the axial direction.

As shown in fig. 1 and 2, the cover 60 is formed by bending a metal plate into a predetermined shape by press working. The cover 60 has a fixing portion 61, a concave portion 62, a convex portion 63, a first rib 64, and a second rib 65. The cover 60 has an outer shape matching the upper end of the housing body 41 (the board 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 concave portion 62 of the cover 60 is located radially inward of the fixing portion 61. The recess 62 is recessed downward (axially on the other side) with respect to the fixing portion 61. In the present embodiment, the recess 62 is positioned on one side (Y side) in the Y direction with respect to the central axis J1 in a state where the cover 60 is attached to the attachment surface 48.

The recess 62 has a bottom surface 62b, an inclined surface 62s, and a connecting inclined surface 62j. The bottom surface 62b is a surface orthogonal to the axial direction. The lower surface 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 convex portion 63. The coupling inclined surface 62j is a surface inclined upward from the bottom surface 62b toward the convex portion 63.

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

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

The protruding 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 convex portion 63 when viewed in the axial direction. In the present embodiment, the distal end surface 63t of the projection 63 is arranged with a space in the axial direction between the projection and the capacitor 57.

The first rib 64 is provided along the bottom surface 62b of the recess 62. In the present embodiment, the front end surface of the first rib 64 is located below the fixing portion 61. That is, the cover 60 has a shape that does not cause the first rib 64 to protrude from the inside of the 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 case of the present embodiment, a plurality of first ribs 64 are provided. In the present embodiment, the first rib 64 includes an inner circumferential side rib 64A and an outer circumferential side rib 64B. In the present embodiment, the inner peripheral rib 64A is provided on the connection inclined surface 62j side in the bottom surface 62 b. The inner peripheral rib 64A extends along the bottom surface 62b to the-Y side and is connected to the connecting 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 and the electronic component protruding upward from the base material 55. The cover 60 is provided with the outer circumferential rib 64B, and thus can suppress contact with the wiring and the electronic components protruding upward from the base material 55.

The second rib 65 is provided on the front end surface 63t of the 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 63 t. In the present embodiment, the second ribs 65 are provided at three locations, for example. The plurality of second ribs 65 are arranged in the X direction when viewed from the axial direction, and are arranged at positions that do not interfere with the capacitor 57.

As shown in fig. 4 and 5, the connector portion 80 includes a connector housing 81, a connector connecting portion 82, a plurality of connection terminals 84, and a communication hole 85. The connector housing 81 is made of an insulating material such as resin, and is held by the board housing 17. The connector connecting portion 82 is provided in the connector housing 81 and detachably connected to an external connector. A communication hole 85 is provided in the connector housing 81 to communicate the inside and the outside of the substrate housing 17.

The connector housing 81 has a body portion 88 and a housing insertion portion 83. The body portion 88 is fixed to the outer peripheral surface of the substrate case 17. The body portion 88 integrally has a fixing flange 88a along the shape of the outer peripheral surface of the substrate case 17. The body portion 88 is fixed along the outer peripheral surface of the housing body portion 41 by a screw member not shown. For example, a liquid gasket, a packing, a sealing material, or the like is interposed between the body portion 88 of the connector housing 81 and the outer peripheral surface of the housing body portion 41. This can prevent water or dust from entering through the gap between the connector housing 81 and the housing main body 41.

As shown in fig. 4 and 5, the body portion 88 holds the plurality of connection terminals 84. As shown in fig. 5, the thickness dimension St of the main body portion 88 in the radial direction is smaller than the length dimension Sh in the axial direction. That is, the main body portion 88 has a radially flat shape.

The connector connecting portion 82 is provided on the connector housing 81. The connector connecting portion 82 is provided integrally with the main body portion 88. The connector connection portion 82 is detachably connected to an external connector of an external power supply. The connector connecting portion 82 is disposed above the body portion 88. As shown in fig. 5, the connector connecting portion 82 includes a connector receiving surface 82p and a hood 82f. The connector receiving surface 82p is provided on the upper side of the housing main body portion 41. The connector receiving surface 82p is a surface facing upward. The connector body of the external connector abuts against the connector receiving surface 82p.

The cover 82f protrudes upward in a cylindrical shape from the outer peripheral portion of the connector receiving surface 82p. The external connector is inserted into the inside of the hood 82f. A fixed portion 82k to be fixed is provided on the radially outer side of the cover portion 82f, and the fixed portion 82k is fixed to a claw portion, not shown, of the external connector.

The connector connecting portion 82 is provided continuously with the body portion 88, and has a radially flat shape as with the body portion 88. In this way, by reducing the cross section of the connector housing 81 orthogonal to the axial direction, in a state where the pump 10 is mounted on the mounting target portion, interference with other devices and the like around the mounting target portion can be suppressed.

The housing insertion portion 83 is disposed radially inward of the body portion 88. The housing insertion portion 83 is provided integrally with the main body portion 88. The housing insertion portion 83 protrudes radially inward from an inner surface 88i of the body portion 88 facing radially inward. The housing insertion portion 83 has a rectangular shape as viewed from the radially inner side.

The housing insertion portion 83 is inserted into the connector mounting hole 49 penetrating the substrate housing 17 in the radial direction. The connector mounting hole 49 communicates the outer peripheral surface and the inner peripheral surface of the substrate housing 17. As shown in fig. 3, the connector mounting hole 49 is rectangular as viewed from the radially inner side of the substrate housing 17. The connector mounting hole 49 has a pair of positioning projections 49t. A pair of positioning projections 49t are provided on both circumferential sides of the inner circumferential surface of the connector mounting hole 49. The pair of positioning projections 49t project toward the circumferential inside of the connector mounting hole 49. The distal end surface of each positioning protrusion 49t is machined to determine the position in the circumferential direction with a predetermined dimensional accuracy.

As shown in fig. 3, both circumferential sides of the housing insertion portion 83 abut against the pair of positioning projections 49t. Thereby, the circumferential position of the housing insertion portion 83 is positioned with high accuracy. As shown in fig. 4 and 5, the housing insertion portion 83 has an opposing surface 83f opposing the interior of the housing 40.

A plurality of connection terminals 84 are held in the connector housing 81. In the present embodiment, for example, 4 sets of the connection terminals 84 are provided. One end of each of the plurality of connection terminals 84 is electrically connected to the circuit portion of the circuit board 50, and the other end is disposed inside the connector connection portion 82. The plurality of connection terminals 84 are arranged at intervals in the circumferential direction. The connection terminal 84 is provided integrally with the connector housing 81 by insert molding. In the present embodiment, a part of each connection terminal 84 is embedded in the body portion 88 and the housing insertion portion 83.

Each connection terminal 84 has a substantially L-shape, and includes a first terminal portion 84a and a second terminal portion 84b. The first terminal portion 84a extends in the radial direction, protruding from the opposing face 83f of the housing insertion portion 83. In a state where the connector housing 81 is fixed to the outer peripheral surface of the housing main body portion 41, the first terminal portion 84a projects radially inward of the housing main body portion 41 from the opposing surface 83f. An insertion terminal portion 84s extending to one axial side is provided at one end of the first terminal portion 84 a. The insertion terminal portion 84s is inserted into a through hole provided in the base 55 of the circuit board 50. The insertion terminal portion 84s is electrically connected to the circuit board 50 by soldering.

As shown in fig. 5, the second terminal portion 84b extends in the axial direction from the other end of the first terminal portion 84a, and protrudes from the main body portion 88. The second terminal portion 84b protrudes from the connector receiving surface 82p in the hood portion 82f of the connector connecting portion 82. The second terminal portion 84b is connected to an external connector-side terminal inserted into the hood portion 82f of the connector connecting portion 82.

A communication hole 85 is provided in the connector housing 81. The communication hole 85 is provided in the body portion 88 and the housing insertion portion 83. The communication hole 85 communicates the inside of the housing 40 with the outside. The air flows between the inside and the outside of the housing 40 through the communication hole 85, thereby suppressing the increase or decrease of the internal pressure of the housing 40. The communication hole 85 includes a first hole 86 and a second hole 87 connected to the first hole 86.

Here, a direction in which the first hole 86 extends in the body portion 88 and the housing insertion portion 83 is referred to as a first direction, and a direction in which the second hole 87 extends in the body portion 88 is referred to as a second direction.

The first hole 86 extends radially from inside the housing 40 (housing main body portion 41) in a state where the connector housing 81 is fixed to the outer peripheral surface of the housing main body portion 41. That is, in the present embodiment, the first direction in which the first hole 86 extends is a radial direction perpendicular to the axial direction.

The first bore 86 has a first open end 86a. The first opening end 86a of the first hole 86 opens to the opposing surface 83f of the housing insertion portion 83 in the housing 40.

In a state where the connector housing 81 is fixed to the outer peripheral surface of the housing main body portion 41, the second hole 87 extends in the axial direction from inside the connector connecting portion 82 and is connected to the first hole 86. That is, in the present embodiment, the second direction in which the second hole 87 extends is the axial direction. The second bore 87 has a second open end 87a and a second closed end 87e. The second open end 87a opens to the connector receiving surface 82p inside the hood 82f. The second closed end 87e is located in the body portion 88 of the connector housing 81.

The communication hole 85 further includes a recessed portion 88A extending in a direction intersecting with the extending direction of at least one of the first hole 86 and the second hole 87. In the present embodiment, the first hole 86 is connected to the middle of the second hole 87. Specifically, the first hole 86 is connected to the second hole 87 between the second open end 87a and the second closed end 87e. The recess 88A is a portion extending in the axial direction beyond the connection portion 85a of the second hole 87 with the first hole 86. In the present embodiment, the recess 88A is recessed in a direction intersecting the extending direction of the first hole 86.

As shown in fig. 4, the center line 86C of the first hole 86 is disposed between a pair of adjacent connection terminals 84 among the plurality of connection terminals 84 as viewed in the axial direction (second direction). Thus, the first opening end 86a of the first hole 86 is disposed on the opposing surface 83f without interfering with the plurality of connection terminals 84 (first terminal portions 84 a).

According to the pump 10 of the present embodiment, the connector portion 80 is provided with the communication hole 85, and the communication hole 85 is connected with the first hole 86 extending in the radial direction as the first direction and the second hole 87 extending in the axial direction as the second direction. That is, the communication hole 85 is not linear but has a shape curved in the middle. Therefore, for example, even when water or dust enters the communication hole 85 from the outside, the water or dust is unlikely to directly reach the inside of the housing 40 through the communication hole 85. As a result, water or dust from the outside can be prevented from entering the housing 40.

In the pump 10 of the present embodiment, by providing the recess 88A recessed in the direction intersecting the extending direction of the first hole 86, when water, dust, or the like enters the communication hole 85 from the outside of the housing 40, the water, dust, or the like enters the recess 88A. This can more reliably prevent water and dust from reaching the inside of the housing 40. In particular, by positioning the recess 88A on the lower side in the state where the pump 10 is attached to the attachment object, water and dust in the recess 88A can be more reliably captured. In addition, clogging of the communication hole 85 with water or dust due to entry of water or dust into the recess 88A can be suppressed. Therefore, air flows between the inside and the outside of the casing 40, and the increase or decrease in the internal pressure of the casing 40 can be effectively suppressed.

In the pump 10 of the present embodiment, the first hole 86 is connected to the middle of the second hole 87, thereby providing the recess 88A extending in the axial direction intersecting the extending direction of the first hole 86. According to this configuration, when the pump 10 is attached to the mounting target site such that the axial direction is the vertical direction, water and dust entering from the inside of the second hole 87 can be captured by the concave portion 88A provided at the bottom of the second hole 87.

In addition, when the connector housing 81 is manufactured, the recess 88A can be easily provided by providing the second hole 87 deeper than the connecting portion 85a with the first hole 86.

In the pump 10 of the present embodiment, the first open end 86a of the first hole 86 communicates with the inside of the housing 40 by inserting the housing insertion portion 83 of the connector housing 81 into the connector mounting hole 49 provided in the housing 40. Therefore, the communication hole 85 communicating with the inside of the housing 40 can be easily provided.

In the pump 10 of the present embodiment, the center line 86C of the first hole 86 is disposed between the pair of adjacent connection terminals 84, so that interference between the connection terminals 84 and a mold member for providing the first hole 86 can be easily suppressed when the connector housing 81 is manufactured.

In the pump 10 of the present embodiment, the second direction in which the second hole 87 extends is an axial direction, and the first direction in which the first hole 86 extends is a radial direction perpendicular to the axial direction. Thus, when the connector portion 80 that protrudes radially outward from the outer peripheral surface of the housing 40 and the external connector is connected to the housing accommodating portion in the axial direction is provided, the communication hole 85 can be effectively provided.

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

For example, in the above embodiment, the case where the recess 88A is provided in the extending direction of the second hole 87 has been described, but the present invention is not limited thereto. For example, as shown in fig. 6, the first bore 86 has a first open end 86a and a first closed end 86e. The first opening end 86a opens to the opposite surface 83f of the housing insertion portion 83 in the housing 40. The first blocking end 86e is located within the body portion 88 of the connector housing 81.

The second hole 87 is connected midway in the first hole 86. Specifically, the second hole 87 is connected to the first hole 86 between the first open end 86a and the first closed end 86e. The recess 88B is a portion extending in the axial direction beyond the connection portion 85B with the second hole 87 in the first hole 86. The recess 88B is recessed in a direction intersecting the extending direction of the second hole 87.

According to the configuration shown in fig. 6, particularly in the case where the pump 10 is attached to the attachment target site with the axial direction thereof being horizontal and the recess 88B is positioned below, the function of capturing water and dust in the recess 88B can be more effectively exhibited.

In addition, both the concave portion 88A and the concave portion 88B may be provided with respect to the communication hole 85.

In the above-described embodiment, as shown in fig. 5, the recess 88A is provided by extending the second hole 87 beyond the first hole 86, but the recess 88A may be provided so as to extend in the axial direction intersecting the extending direction of the first hole 86 at a portion of the first hole 86 that is located in front of the connection portion 85a with the second hole 87.

Similarly, as shown in fig. 6, the recess 88B is provided by extending the first hole 86 more than the second hole 87, but the recess 88B may be provided so as to extend in a radial direction intersecting the extending direction of the second hole 87 at a portion of the second hole 87 that is further forward than the connection portion 85B with the first hole 86.

In the above embodiment, only one communication hole 85 is provided in the connector portion 80, but a plurality of sets of communication holes 85 may be provided.

In the above embodiment, the communication hole 85 is provided by connecting one second hole 87 to one first hole 86, but the present invention is not limited thereto. The communication hole 85 may be formed by connecting a plurality of second holes 87 to one first hole 86. In addition, the communication hole 85 may connect a plurality of first holes 86 to one second hole 87.

In the above embodiment, the first direction in which the first hole 86 extends is the radial direction, and the second direction in which the second hole 87 extends is the axial direction, but the present invention is not limited to this. The first direction in which the first hole 86 extends and the second direction in which the second hole 87 extends may be set to any directions with respect to the housing 40 as long as they have a relationship orthogonal to each other.

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 in a direction inclined with respect to the vertical direction, not perpendicular to the vertical direction, or may extend in parallel with the vertical direction. In addition, the structures and the methods described in this specification can be combined as appropriate within a range not inconsistent with each other.

(symbol description)

A 10 … pump; 20 … motor; 21 … rotor portion; a 30 … pump mechanism; 40 … outer casing; 41k … receiving recess; 49 … connector mounting holes; 50 … circuit substrate; 60 … mask; an 80 … connector portion; 81 … connector housing; 82 … connector connection; 83 … a housing insertion portion; 83f … opposite faces; 84 … connection terminal; 85 … communicating holes; 85a, 85b …;86 …;86C … centerline; 87 … second aperture; 88A, 88B … recess; j1 … central axis.

Claims (7)

1. An electric pump is characterized by comprising:

a motor having a rotor portion rotatable about a central axis line extending in an axial direction;

a pump mechanism coupled to the rotor portion;

a circuit board provided on one side of the motor in an axial direction;

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

a cover attached to one side of the housing in the axial direction and closing a housing recess housing the circuit board; and

a connector portion provided to the housing and connected to the circuit board,

the connector portion has:

a connector housing held by the housing;

a connector connecting portion provided in the connector housing and detachably connected to an external connector; and

a communication hole provided in the connector housing and communicating an inside and an outside of the housing,

the communication hole includes:

a first aperture extending from within the housing in a first direction; and

and a second hole extending from inside the connector connecting portion in a second direction intersecting the first direction and connected to the first hole.

2. The electric pump of claim 1,

the communication hole further includes a concave portion,

the recess extends in a direction intersecting with an extending direction of at least one of the first hole and the second hole.

3. The electric pump of claim 2,

the first hole is connected midway to the second hole,

the recess is a portion extending in the second direction beyond a connection portion of the second hole with the first hole.

4. The electric pump of claim 2,

the second hole is connected midway to the first hole,

the recess is a portion extending in the first direction beyond a connection portion between the first hole and the second hole.

5. The electric pump according to any one of claims 1 to 4,

the housing is provided with a connector mounting hole for communicating the outer peripheral surface and the inner peripheral surface of the housing,

the connector housing has a housing insertion portion inserted into the connector mounting hole,

the first hole opens on an opposite surface of the housing insertion portion to an inside of the housing.

6. The electric pump of claim 5,

the connector section further has a plurality of connection terminals, one ends of which are electrically connected to the circuit board and the other ends of which are exposed inside the connector connection section, and which are held by the connector housing, one ends of which protrude from the opposing surface toward the inside of the housing,

the center line of the first hole is disposed between a pair of adjacent connection terminals among the plurality of connection terminals when viewed from the second direction.

7. The electric pump according to any one of claims 1 to 4,

the second direction is the axial direction;

the first direction is a radial direction orthogonal to the axial direction.

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