CN212563632U

CN212563632U - Electric pump device and mounting structure for electric pump device

Info

Publication number: CN212563632U
Application number: CN202020311347.9U
Authority: CN
Inventors: 坂本仁; 樋口孔二; 梶田国博; 池田智一
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Tosok Corp
Priority date: 2019-03-29
Filing date: 2020-03-13
Publication date: 2021-02-19
Anticipated expiration: 2030-03-13
Also published as: US20200309130A1; JP2020165409A

Abstract

An embodiment of the electric pump device of the present invention includes: a motor having a shaft extending along a first central axis; a pump section driven by a motor; and a housing accommodating the motor and the pump section. The housing has: a housing main body portion having a bottomed cylindrical shape and extending in an axial direction; a flange portion extending radially outward from an outer peripheral surface of the housing main body portion; and a protruding portion extending from the bottom of the housing main body portion toward one axial side. The second central axis of the protruding portion is arranged at a position radially offset from the first central axis. The flange portion has a protruding portion protruding toward one axial side from an end surface of the flange portion toward one axial side. Therefore, the present invention provides an electric pump device and an electric pump device mounting structure, in which the electric pump device and a mounted body are easily assembled.

Description

Electric pump device and mounting structure for electric pump device

Technical Field

The utility model relates to an electric pump device and electric pump device's mounting structure.

Background

The electric pump unit of patent document 1 is a unit in which a pump, an electric motor for driving the pump, and a cover are integrated. The electric pump unit is disposed in a recess including a bottomed circular hole that is opened in a rear surface of a vertical wall of the transmission case. The cylindrical portion of the cover is tightly fitted into the rear portion of the recess, and the outward flange is brought into contact with the rear surface of the vertical wall of the housing around the recess via an O-ring and fixed by a bolt or the like. The oil discharge pipe of the pump is tightly inserted into the through hole formed on the bottom wall of the recess.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent No. 5552831 publication

SUMMERY OF THE UTILITY MODEL

In patent document 1, the cylindrical portion of the cap is fitted into the recess, and the drain pipe is fitted into the through hole, so that alignment is difficult and assembly is difficult.

In view of the above, it is an object of the present invention to provide an electric pump device and a mounting structure of the electric pump device, which facilitate assembly of the electric pump device and a body to be mounted.

Means for solving the problems

An embodiment of the electric pump device of the present invention comprises a motor having a shaft extending along a first center axis, a pump section driven by the motor, and a housing accommodating the motor and the pump section. The housing includes: a housing main body portion having a bottomed cylindrical shape and extending in an axial direction; a flange portion extending radially outward from an outer peripheral surface of the housing main body portion; and a protruding portion extending from a bottom portion of the housing main body portion toward one axial side. The second center axis of the protruding portion is arranged at a position radially offset from the first center axis. The flange portion has a protruding portion that protrudes toward one axial side from an end surface of the flange portion that faces one axial side.

In addition, an embodiment of the mounting structure of the electric pump apparatus of the present invention includes: the electric pump device and an attached body to which the electric pump device is attached. The mounted body includes: a mounting surface facing the other axial side and contacting an end surface of the flange portion facing the one axial side; a recess into which the housing main body is inserted, the recess being recessed from the mounting surface toward one axial side; and an input port opened in a bottom surface of the recess and extending in an axial direction for insertion of the protrusion. The inner peripheral surface of the recess faces the outer peripheral surface of the housing main body with a gap in the radial direction. The mounting surface has an insertion hole recessed toward one side in the axial direction from the mounting surface. The projection is inserted into and contacts the insertion hole.

Effect of the utility model

According to the electric pump device and the mounting structure of the electric pump device of one embodiment of the present invention, the electric pump device is easily assembled with the mounted body.

Drawings

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

Fig. 2 is a bottom view showing the electric pump device of the present embodiment.

Fig. 3 is a vertical cross-sectional view of the electric pump device and the mounting structure of the electric pump device according to the present embodiment, showing a cross-section III-III in fig. 2.

Fig. 4 is an enlarged longitudinal sectional view of a part of fig. 3.

Fig. 5 is a side view showing a part of the housing main body and the press-fitting jig.

Fig. 6 is a vertical cross-sectional view showing a first modification of the electric pump device and the mounting structure of the electric pump device according to the present embodiment.

Fig. 7 is a vertical cross-sectional view showing a second modification of the electric pump device and the mounting structure of the electric pump device according to the present embodiment.

Fig. 8 is a vertical cross-sectional view showing a third modification of the electric pump device and the mounting structure of the electric pump device according to the present embodiment.

Description of the symbols

10: electric pump device

20: motor with a stator having a stator core

22: shaft

30: pump section

40: outer casing

41: housing body part

41 b: bottom part

42: flange part

42 a: end face

44: projection part

46: convex part

46 a: first convex part

46 b: second convex part

50: inverter with a voltage regulator

51: hole part

52: pin part

60: inverter casing

80: mounting structure of electric pump device

100: mounted body

101: concave part

101 a: bottom surface

101 b: inner peripheral surface

102: input port

110: mounting surface

111: inserting hole

J1: a first central shaft

J2: second central shaft

J3: third central shaft

L1, L2: length of

N1: first normal line

N2: second normal line

P1: first tangent point

P2: second tangent point

T1: first tangent line

T2: second tangent line

VL: virtual straight line

Detailed Description

An electric pump device 10 and an attachment structure 80 of the electric pump device according to an embodiment of the present invention will be described with reference to the drawings. In the figure, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. As shown in fig. 1 to 3, the electric pump device 10 includes a motor 20, a pump section 30, a casing 40, an inverter case 60, a circuit board 55, a wiring member 56, a bus bar 58, an inverter 50, a capacitor 57, and a breather pipe 59. The mounting structure 80 of the electric pump device includes the electric pump device 10, a body 100 to which the electric pump device 10 is mounted, and a screw member 105.

The motor 20 has a shaft 22 extending along a first center axis J1, and the first center axis J1 extends along the Z-axis direction. The first center axis J1 may be simply referred to as the center axis J1. In the following description, the direction parallel to the first central axis J1 will be simply referred to as "axial direction". In the present embodiment, the axial position of the motor 20 and the axial position of the inverter 50 are different from each other. That is, the motor 20 and the inverter 50 are arranged at different positions in the axial direction. In the axial direction, a direction from the inverter 50 toward the motor 20 is referred to as one axial side (-Z side), and a direction from the motor 20 toward the inverter 50 is referred to as the other axial side (+ Z side). The X-axis direction is a direction orthogonal to the Z-axis direction. The Y-axis direction is a direction orthogonal to the Z-axis direction and the X-axis direction. The Y-axis direction is an inter-axis direction described later.

The radial direction centered on the first center axis J1 is simply referred to as "radial direction". In the radial direction, a direction approaching the first center axis J1 is referred to as a radially inner side, and a direction away from the first center axis J1 is referred to as a radially outer side. The circumferential direction around the first center axis J1, that is, the axial periphery of the first center axis J1 is simply referred to as the "circumferential direction". In the present embodiment, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal direction.

The electric pump device 10 of the present embodiment sucks and discharges a fluid such as oil, for example. The electric pump device 10 has a function of circulating a fluid in a flow path, for example. In the case where the fluid is oil, the electric pump device 10 may also be referred to as an electric oil pump device. In the present embodiment, the electric pump device 10 is mounted to a mounted body 100 that is a housing of a driving device of a vehicle. That is, the electric pump device 10 is mounted on the vehicle.

The mounted body 100 includes a mounting surface 110, a recess 101, an input port 102, an output port 103, and a corner 104. The mounting surface 110 faces the other axial side. The recess 101 is recessed from the mounting surface 110 toward one axial side. The recess 101 is a bottomed circular hole. The input port 102 opens at the bottom surface 101a of the recess 101 and extends in the axial direction. The input port 102 is circular. The output port 103 opens in the recess 101 at a position different from the input port 102. In the present embodiment, the output port 103 opens to the inner peripheral surface 101b of the recess 101. The corner portion 104 is an annular shape extending in the circumferential direction, and is a portion where the inner peripheral surface 101b of the recess 101 is connected to the mounting surface 110. The corner 104 is circular and annular. The electric pump device 10 sucks oil from the input port 102 by the pump section 30 and discharges the oil from the output port 103.

The motor 20 includes a rotor portion 21, a stator portion 26, and a plurality of

bearings

11 and 12. The rotor portion 21 includes a shaft 22, a rotor core 23, a magnet 24, and a magnet holder 25.

The shaft 22 extends in the axial direction about the first center axis J1. The shaft 22 rotates about the first center axis J1. The shaft 22 is supported by the plurality of

bearings

11 and 12 to be rotatable about the first central axis J1. That is, the plurality of

bearings

11 and 12 rotatably support the shaft 22. The plurality of

bearings

11 and 12 are, for example, ball bearings. Of the plurality of

bearings

11, 12, the first bearing 11 supports a portion of the shaft 22 located on one side in the axial direction than the rotor core 23. Of the plurality of

bearings

11 and 12, the second bearing 12 supports a portion of the shaft 22 located on the other axial side than the rotor core 23.

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

The magnet 24 is disposed at the radial outer end of the rotor core 23. In the present embodiment, the magnet 24 is of a buried magnet type. Further, the magnet 24 may be a surface magnet type. The magnet 24 is provided in plurality. The plurality of magnets 24 are arranged at intervals in the circumferential direction at the radial outer end of the rotor core 23. The magnet 24 may be, for example, a cylindrical ring magnet.

The magnet holder 25 is provided on the rotor core 23 and holds the magnet 24. In the present embodiment, the magnet holder 25 suppresses the detachment of the magnet 24 from the rotor core 23 in the axial direction. The magnet holder 25 is disposed on the radially outer surface of the rotor core 23, a surface facing one axial side, and a surface facing the other axial side.

The stator portion 26 is disposed radially outward of the rotor portion 21 and faces the rotor portion 21 with a gap therebetween 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, an insulator 28, and a plurality of coils 29.

The stator core 27 is annular with the first center axis J1 as the center. 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 core back 27a and a plurality of teeth 27 b. The core back portion 27a is annular with a central axis as a center. The core back portion 27a is cylindrical extending in the axial direction. The radially outer side surface of the core back portion 27a is fixed to the inner peripheral surface of the housing 40. The core back portion 27a is fitted into the outer shell 40. The teeth 27b extend radially inward from the radially inner surface of the core back portion 27 a. The plurality of teeth 27b are arranged on the radially inner surface of the core back portion 27a at intervals in the circumferential direction.

The insulator 28 is mounted on the stator core 27. The insulator 28 has a portion covering the teeth 27 b. The material of the insulator 28 is, for example, an insulating material such as resin.

The plurality of coils 29 are attached to the stator core 27 via the insulator 28. That is, the plurality of coils 29 are attached to the stator core 27. Each of the plurality of coils 29 is formed by winding a conductive wire around each tooth 27b via an insulator 28.

Although not particularly shown in the drawing, the plurality of coils 29 includes a first coil, a second coil, and a third coil. The first coil has a first wire. The second coil has a second conductive line different from the first conductive line. The third coil has a third conductive line different from the first conductive line and the second conductive line. The first coil, the second coil and the third coil are different from each other. In the present embodiment, the motor 20 is a three-phase motor. Three phases are referred to as U phase, V phase and W phase. In the case of a three-phase motor, the wires of the coils 29 constituting the U-phase, V-phase, and W-phase are different from each other. That is, the lead wire of the U-phase coil 29, the lead wire of the V-phase coil 29, and the lead wire of the W-phase coil 29 are different from each other.

The coil 29 includes a winding portion 29a wound around a part of the stator core 27, a crossover portion 29b connected to the winding portion 29a and connecting the plurality of coils 29 to each other, and a lead portion 29c connected to the winding portion 29a and connecting the coil 29 to the bus bar 58. The winding portion 29a is formed by winding a wire around the teeth 27b via the insulator 28. The bonding wire portion 29b connects a plurality of winding portions 29a including a single lead wire. The lap wire portion 29b is disposed on the other axial side or one axial side of the stator core 27. The transition wire portion 29b has a portion extending along a virtual plane (not shown) perpendicular to the first center axis J1. The lead wire portion 29c is drawn out from the winding portion 29a toward the other side in the axial direction, and is connected to the circuit board 55 via the bus bar 58.

The pump section 30 is driven by the motor 20. The pump unit 30 is disposed on one axial side of the stator unit 26. The pump portion 30 is connected to the rotor portion 21. In the present embodiment, the pump section 30 has a trochoid pump (trochoid pump) configuration. The pump section 30 has an inner rotor 30a and an outer rotor 30b located radially outward of 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 an end portion of the shaft 22 on one axial side. The motor 20 rotates the inner rotor 30a to drive the pump section 30.

The housing 40 accommodates the motor 20 and the pump section 30. The housing 40 includes a housing main body 41, a protruding portion 44, a sealing portion 43, and a flange portion 42 extending radially outward from the outer peripheral surface of the housing main body 41.

The motor 20 and the pump unit 30 are housed in the housing body 41. The housing body 41 is cylindrical and extends in the axial direction. The case body 41 has a bottomed cylindrical shape. The case body 41 has a peripheral wall 41a and a bottom 41 b. The stator core 27 is fitted into the peripheral wall portion 41 a. The bottom portion 41b closes one axial end of the peripheral wall portion 41 a. As shown in fig. 3, the housing main body portion 41 is inserted into the recess 101 of the mounted body 100. The inner peripheral surface 101b of the recess 101 faces the outer peripheral surface of the housing body 41 with a gap in the radial direction.

The housing body 41 has a cylindrical portion 41c, a stepped surface 41i, a hammer portion 41d, a pump receiving wall portion 41l, a pump receiving hole 41e, a bearing retaining cylindrical portion 41h, a pump cover 41f, and an oil seal 41 g. The cylindrical portion 41c, the stepped surface 41i, and the hammer portion 41d are provided in the peripheral wall portion 41 a. The pump housing wall portion 41l, the pump housing hole 41e, the bearing retainer cylinder portion 41h, the pump cover 41f, and the oil seal 41g are provided on the bottom portion 41 b.

The cylindrical portion 41c is disposed at the other axial end of the housing body portion 41. The cylindrical portion 41c is cylindrical with the first center axis J1 as the center. The cylindrical portion 41c extends in the axial direction. The outer peripheral surface of the cylindrical portion 41c is connected to an end surface 42a of the flange portion 42 facing one axial side. The step surface 41i is an annular surface centered on the first center axis J1 and faces one axial side. The outer peripheral portion of the stepped surface 41i is connected to one axial end of the cylindrical portion 41 c.

The hammer 41d is located on one axial side of the flange 42. The hammer 41d is positioned on one axial side of the cylindrical portion 41c and the stepped surface 41 i. The other axial end of the hammer 41d is connected to the inner peripheral portion of the stepped surface 41 i. The hammer 41d is disposed in the peripheral wall 41a at a portion other than the end portion on the other side in the axial direction.

The outer diameter of the hammer portion 41d becomes smaller toward one axial side. In the present embodiment, as shown in fig. 3, when viewed in a vertical cross section along the first center axis J1, the inclination angle of the portion 41J of the hammer-shaped portion 41d on one side in the axial direction with respect to the first center axis J1 is larger than the inclination angle of the portion 41k of the hammer-shaped portion 41d on the other side in the axial direction with respect to the first center axis J1. That is, in the longitudinal section, the radial displacement amount (i.e., the inclination) per unit length in the axial direction of the portion 41j on one side in the axial direction in the hammer-shaped portion 41d is larger than the radial displacement amount per unit length in the axial direction of the portion 41k on the other side in the axial direction in the hammer-shaped portion 41 d.

According to the present embodiment, since the case body portion 41 has the hammer-shaped portion 41d, a gap can be provided between the inner peripheral surface 101b of the recess 101 of the attached body 100 and the hammer-shaped portion 41 d. This gap is larger than the gap between the inner circumferential surface 101b of the recess 101 and the cylindrical portion 41 c. That is, in the present embodiment, a gap is provided between the outer peripheral surface of the housing body 41 and the inner peripheral surface 101b of the pocket 101, and the oil can flow through the gap, so that the effect of using the oil cooling motor 20 can be obtained.

The pump housing wall 41l is connected to one axial end of the hammer portion 41 d. The pump housing wall portion 41l closes one axial end portion of the peripheral wall portion 41 a. The pump housing wall 41l is a disk shape with its plate surface facing in the axial direction.

The pump housing hole 41e is recessed from the plate surface of the pump housing wall 41l facing one axial side toward the other axial side. In the present embodiment, the pump accommodation hole 41e is a circular hole having a top. The pump section 30 is disposed in the pump housing hole 41 e. The bearing retainer cylinder portion 41h is a cylindrical shape extending from the pump housing wall portion 41l to the other axial side. The bearing retainer cylinder portion 41h protrudes from the plate surface of the pump housing wall portion 41l toward the other axial side. The bearing retainer cylinder portion 41h retains the first bearing 11. The first bearing 11 is fitted in the bearing retainer cylinder portion 41 h.

The pump cover 41f is fixed to a plate surface of the pump housing wall 41l facing one axial side, and covers the pump section 30 from one axial side. The oil seal 41g is annular with the first center axis J1 as the center. The oil seal 41g is disposed in the bearing retainer cylinder portion 41h and is positioned on one axial side of the first bearing 11.

The projection 44 is cylindrical and extends in the axial direction. The protruding portion 44 is cylindrical. The projection 44 may also be referred to as a barrel. The protruding portion 44 extends from the bottom portion 41b of the housing body 41 toward one axial side. In the present embodiment, the protruding portion 44 protrudes from the pump cover 41f to one axial side. The protruding portion 44 extends in the axial direction around the second center axis J2. The second center axis J2 of the protruding portion 44 is arranged at a position radially offset from the first center axis J1. The second central axis J2 and the first central axis J1 extend parallel to each other.

The tab 44 is inserted into and contacts the input port 102. That is, the protrusion 44 is inserted into the input port 102. The protruding portion 44 has a groove portion 44a and an elastic ring member 45. The groove portion 44a is disposed on the outer peripheral surface of the protruding portion 44 and extends around the axis of the second center axis J2. The groove portion 44a is an annular groove centered on the second center axis J2. The elastic ring member 45 is annular and is fitted to the outer peripheral surface of the projection 44, and is elastically deformable. The elastic ring member 45 is, for example, an O-ring or the like. The elastic ring member 45 is disposed in the groove portion 44 a. The elastic ring member 45 extends around the axis of the second center axis J2.

In the present embodiment, as shown in fig. 2, a direction in which a virtual straight line VL passing through the first center axis J1 and the second center axis J2 extends when the housing 40 is viewed from the axial direction is defined as an inter-axial direction. In fig. 2, the inter-axis direction is a direction extending along the Y axis. In the inter-axis direction, the direction from the second center axis J2 toward the first center axis J1 is the + Y side. In the axial direction, a direction from the first center axis J1 toward the second center axis J2 is the-Y side.

The seal portion 43 is annular and extends in the circumferential direction. The seal portion 43 is annular with the first center axis J1 as the center. As shown in fig. 3 and 4, the seal portion 43 is disposed at a corner portion 47 where the outer peripheral surface of the housing body portion 41 and the end surface 42a of the flange portion 42 facing the one axial side are connected. In the present embodiment, the cross section of the seal portion 43 along the radial direction is circular. The sealing portion 43 is, for example, an O-ring, and is elastically deformable. The seal portion 43 is disposed between the corner portion 104 and the corner portion 47. Sealing portion 43 seals between corner portion 104 and corner portion 47. In the present embodiment, the corner portion 104 includes a bottom wall 104a and an inner peripheral wall 104 b.

The bottom wall 104a is located on one axial side of the mounting surface 110 and faces the other axial side. The bottom wall 104a is a flat surface extending in a direction perpendicular to the central axis (corresponding to the first central axis J1) of the recess 101. The bottom wall 104a is annular with the center axis of the recess 101 as the center. The inner circumferential wall 104b is located radially outward of the inner circumferential surface 101b of the recess 101 and radially inward. The inner circumferential wall 104b is annular with the center axis of the recess 101 as the center. An end portion on one side in the axial direction of the inner peripheral wall 104b and an outer peripheral portion of the bottom wall 104a are connected to each other. According to the present embodiment, the seal portion 43 is sandwiched between the bottom wall 104a and the inner peripheral wall 104b of the corner portion 104 of the body 100 to be mounted, and the corner portion 47 of the housing 40. The corner portion 104 is easily processed, and the sealing property by the sealing portion 43 is stable.

As shown in fig. 1 to 4, the flange 42 includes a flange body 42b and a mounting portion 42 c. The flange main body 42b is a circular ring shape having the first center axis J1 as the center. The mounting portion 42c protrudes radially outward from the flange main body 42 b. In the present embodiment, the plurality of mounting portions 42c are provided at intervals in the circumferential direction. Each mounting portion 42c is fixed to a mounting surface 110 of the mounted body 100 by a screw member 105.

The flange portion 42 has an end surface 42a facing one axial side, a positioning portion 46, a hole portion 51, a pin portion 52, and a mounting hole 48. The end face 42a is disposed across the flange portion main body 42b and the mounting portion 42 c. The end surface 42a is a flat surface extending in a direction orthogonal to the first central axis J1. The mounting surface 110 is in contact with the end surface 42 a. The mounting surface 110 is a flat surface extending in a direction orthogonal to the central axis of the recess 101.

As shown in fig. 3, the end face 42a is disposed between a first virtual plane VP1 and a second virtual plane VP2 in the axial direction, the first virtual plane VP1 passing through the stator core 27, the winding portion 29a, and the crossover portion 29b at the one side in the axial direction and extending in the direction orthogonal to the first center axis (center axis) J1, and the second virtual plane VP2 passing through the stator core 27, the winding portion 29a, and the crossover portion 29b at the other side in the axial direction and extending in the direction orthogonal to the first center axis J1. That is, the axial position of the end face 42a is between the axial position of the portion of the stator core 27, the winding portion 29a, and the crossover portion 29b that is positioned on the one side in the axial direction and the axial position of the portion of the stator core 27, the winding portion 29a, and the crossover portion 29b that is positioned on the other side in the axial direction.

The weight of the stator portion 26 is a large proportion of the total weight of the electric pump apparatus 10. Therefore, for example, unlike the present embodiment, if the center of gravity of the stator portion 26 is axially away from the fixing surface of the electric pump device 10 to the attached body 100, that is, the end surface 42a of the flange portion 42 facing the one axial side, the electric pump device 10 is likely to vibrate.

In contrast, in the electric pump device 10 of the present embodiment, the end surface 42a of the flange portion 42 facing one axial side is disposed in the range where the stator core 27, the winding portion 29a, and the crossover portion 29b are located in the stator portion 26 in the axial direction. The center of gravity of the stator portion 26 is located at any one of the stator core 27, the winding portion 29a, and the crossover portion 29 b. That is, according to the present embodiment, the end surface 42a of the flange portion 42 facing one axial side is arranged close to the center of gravity of the stator portion 26 in the axial direction. This can suppress vibration of the electric pump device 10. Specifically, vibration generated due to the operation of the electric pump device 10 can be suppressed. Further, as in the present embodiment, when the mounted body 100 is a housing of a driving device of a vehicle, the electric pump device 10 is suppressed from vibrating (resonating) due to vibration generated by the operation of the driving device or vibration generated by the traveling of the vehicle.

The end face 42a is arranged on the other axial side than the stator core 27 in the axial direction. According to the present embodiment, the end surface 42a of the flange portion 42 facing one axial side is disposed in the range of the portion of the winding portion 29a and the crossover portion 29b located on the other axial side than the stator core 27 in the axial direction. In this case, the effect of suppressing the vibration of the electric pump device 10 as described above can be obtained, and the amount of protrusion of the electric pump device 10 from the mounting surface 110 of the mounted body 100 toward the other side in the axial direction can be suppressed. This ensures a space for installing another member on the other axial side of the electric pump device 10. In addition, the overall outer dimensions of the electric pump device 10 and the attached body 100 can be reduced.

In addition, although the electric pump device 10 may easily vibrate in a configuration in which a gap is generally provided between the outer peripheral surface of the housing main body portion 41 and the inner peripheral surface 101b of the recess 101, according to the present embodiment, the electric pump device 10 is disposed so as to be axially close to the center of gravity of the stator portion 26 with respect to the flange portion 42, which is the fixing surface of the attached body 100, and therefore vibration of the electric pump device 10 can be suppressed.

In the present embodiment, the protruding portion 44 is inserted into the input port 102 of the attached body 100. By interposing the elastic ring member 45 between the outer peripheral surface of the protruding portion 44 and the input port 102, the sealing property between the protruding portion 44 and the input port 102 is ensured, and the elastic ring member 45 functions as a buffer material (vibration suppressing material) between the electric pump device 10 and the body 100 to be attached. Therefore, the vibration is further suppressed.

The positioning portion 46 is provided at the end face 42 a. That is, the flange portion 42 has the positioning portion 46 on the end surface 42 a. The positioning portion 46 is disposed in the flange portion main body 42 b. The positioning portion 46 is in the shape of a protrusion protruding from the end surface 42a to one axial side or a hole recessed from the end surface 42a to the other axial side. In the present embodiment, the positioning portion 46 is a convex shape protruding from the end surface 42a to one axial side. Therefore, the positioning portion 46 may also be referred to as a projection 46. That is, the flange portion 42 has a convex portion 46 protruding from the end surface 42a to one axial side. At least one or more projections 46 are provided on the flange portion 42. The positioning portion 46 extends in the axial direction centering on the third center axis J3. The third central axis J3 is parallel to the first central axis J1 and the second central axis J2.

The mounting surface 110 has mounting surface positioning portions 111 into which the positioning portions 46 are fitted. The attachment surface positioning portion 111 has a hole shape recessed from the attachment surface 110 to one side in the axial direction or a convex shape protruding from the attachment surface 110 to the other side in the axial direction. In the present embodiment, the mounting surface positioning portion 111 is a hole shape recessed from the mounting surface 110 to one side in the axial direction. Therefore, the mounting surface positioning portion 111 may also be referred to as an insertion hole 111. That is, the mounting surface 110 has an insertion hole 111 recessed from the mounting surface 110 to one axial side. The positioning portion 46 (convex portion 46) is inserted into the mounting surface positioning portion 111 (insertion hole 111) and contacts. That is, the positioning portions 46 are inserted into the mounting surface positioning portions 111.

In the electric pump device 10 and the mounting structure 80 of the electric pump device according to the present embodiment, the sealing portion 43 is disposed between the corner portion 47 of the housing 40 and the corner portion 104 of the body 100 to be mounted. For example, unlike the present embodiment, the flange portion 42 can be reduced in outer diameter by providing an annular housing groove that is open in the axial direction and extends in the circumferential direction in the end surface 42a of the flange portion 42 facing the one axial side or the mounting surface 110 of the body 100, and housing the seal portion in the housing groove. Therefore, the electric pump device 10 can be downsized. In the present embodiment, since the corner portion 104 of the mounted body 100 has a smaller diameter than the diameter of the receiving groove, the amplitude of the cutting process of the corner portion 104 is reduced, the processing accuracy such as flatness and verticality is improved, and the sealing performance at the corner portion 104 is improved.

Further, for example, unlike the present embodiment, the configuration in which an annular housing groove that is open in the radial direction and extends in the circumferential direction is provided on the outer circumferential surface of the housing body portion 41 or the inner circumferential surface 101b of the pocket 101, and the seal portion is housed in the housing groove eliminates the need for groove processing of the housing 40, and simplifies the processing of the corner portion 104 of the body 100 to be mounted. Therefore, the processing time at the time of manufacturing can be shortened, and the manufacturing cost and the tact time can be reduced.

In the present embodiment, the positioning portion 46 is provided on the end surface 42a of the flange portion 42 facing the one axial side. The positioning portion 46 of the electric pump device 10 is fitted to the mounting surface positioning portion 111 of the mounting surface 110 of the mounted body 100, that is, the convex portion 46 of the flange portion 42 is inserted into the insertion hole 111 of the mounting surface 110, whereby the housing main body portion 41 of the electric pump device 10 and the recess 101 of the mounted body 100 are coaxially arranged with their central axes aligned. Thus, the distance between the corner 47 of the housing 40 and the corner 104 of the body 100 to be mounted is fixed in the circumferential direction, and the sealing performance of the seal portion 43 is stabilized over the entire circumference in the circumferential direction. Therefore, variation in the sealing performance between the electric pump device 10 and the mounted body 100 in the circumferential direction and the radial direction can be suppressed. That is, it is possible to suppress the occurrence of unevenness in the sealing performance between the electric pump device 10 and the mounted body 100 at each position in the circumferential direction of the seal portion 43 or at the inner end and the outer end in the radial direction of the seal portion 43.

In addition, in the present embodiment, while the sealing performance is stabilized as described above, it is not necessary to fit the outer peripheral surface of the housing body portion 41 to the inner peripheral surface 101b of the recess 101, and the degree of freedom of relative movement of the two members is secured when the electric pump device 10 is attached to the attached body 100. That is, the protruding portion 44 of the housing 40 is easily inserted and fitted into the input port 102 of the body 100 to be mounted, and the positioning portion 46 (protruding portion 46) of the housing 40 is inserted and fitted into the mounting surface positioning portion 111 (insertion hole 111) of the mounting surface 110 of the body 100 to be mounted. Therefore, the electric pump device 10 and the attached body 100 are easily assembled. For example, unlike the present embodiment, in the configuration in which the outer peripheral surface of the housing body 41 is fitted to the inner peripheral surface 101b of the recess 101, there is a possibility that an increase in internal stress, displacement, or the like occurs in the stator 26 fitted in the housing body 41 during assembly, but in the present embodiment, stress generation in the stator 26 is suppressed, and the performance of the motor 20 is maintained well. Further, by providing a gap between the outer peripheral surface of the housing body portion 41 and the inner peripheral surface 101b of the pocket 101, oil can be made to flow through the gap, and a cooling effect can be obtained by the oil.

As shown in fig. 2, the positioning portion 46 (convex portion 46) is arranged in the direction (+ Y side) from the second center axis J2 toward the first center axis J1 in the inter-axial direction, compared to the protruding portion 44. According to the present embodiment, the positioning portion 46 is disposed at a position apart from the protruding portion 44 in the flange portion 42. That is, a large distance is ensured between the protruding portion 44 and the positioning portion 46. Therefore, in a state where the distance in the axial direction between second central axis J2 of protruding portion 44 and third central axis J3 of positioning portion 46 is secured to be large, protruding portion 44 is fitted to inlet port 102, and positioning portion 46 is fitted to mounting surface positioning portion 111. This suppresses the circumferential positional shift between the housing 40 of the electric pump device 10 and the recess 101 of the mounted body 100, improves the accuracy of the circumferential position, and improves the accuracy of the coaxiality between the housing 40 and the recess 101. The distance between the corner 47 of the housing 40 and the corner 104 of the body 100 to be mounted is less likely to vary at each position in the circumferential direction, and the sealing performance by the sealing portion 43 is more stable.

Two positioning portions 46 (protruding portions 46) are provided in the flange portion 42. According to the present embodiment, since the two positioning portions 46 are provided, the accuracy of the coaxiality of the housing 40 of the electric pump device 10 and the recess 101 of the attached body 100 is more stable. Specifically, in the present embodiment, the accuracy of the radial position and the accuracy of the circumferential position of the housing 40 with respect to the recess 101 of the body 100 to be mounted are improved as compared with a configuration in which only one positioning portion 46 is provided, for example. In addition, for example, in a configuration in which three positioning portions 46 are provided, two of the three positioning portions 46 are in contact with the mounting surface positioning portion 111 (insertion hole 111), but since one positioning portion is difficult to be in contact with the mounting surface positioning portion 111, it is difficult to obtain a positioning function in one positioning portion 46. Further, in order to fit the three positioning portions 46 to the mounting surface positioning portions 111, respectively, it is necessary to increase the fitting tolerance, and accordingly, the play (gap) after assembly becomes large, and the positioning accuracy may be lowered.

The two positioning portions 46 (convex portions 46) in the present embodiment are a first positioning portion 46a and a second positioning portion 46 b. The first positioning portion 46a may also be referred to as a first protrusion 46 a. The second positioning portion 46b may also be referred to as a second projection 46 b. That is, the two convex portions 46 are a first convex portion 46a and a second convex portion 46 b. As shown in fig. 2, two tangent lines that pass through the 3 rd center axis J3 of the first locator 46a and are tangent to the outer peripheral surface of the projection 44 when the housing 40 is viewed in the axial direction are a first tangent line T1 and a second tangent line T2. When the housing 40 is viewed in the axial direction, a normal line passing through a first tangent point P1 that is a tangent point of the outer peripheral surface of the protruding portion 44 and the first tangent line T1 and extending from the first tangent line T1 in a direction opposite to the second center axis J2 is a first normal line N1, a normal line passing through a second tangent point P2 that is a tangent point of the outer peripheral surface of the protruding portion 44 and the second tangent line T2 and extending from the second tangent line T2 in a direction opposite to the second center axis J2 is a second normal line N2. The second positioning portion 46b is disposed in a direction (Y side) from the first center axis J1 toward the second center axis J2 in the inter-axial direction than the first normal line N1 and the second normal line N2 when the housing 40 is viewed in the axial direction. That is, the second positioning portion 46b is disposed in the range indicated by the symbol a in fig. 2 in the flange portion 42. In the present embodiment, the second positioner 46b is disposed between the first tangent T1 and the second tangent T2 in the flange portion 42, and on either the first tangent T1 or the second tangent T2.

According to the present embodiment, the first positioning portion 46a (the first convex portion 46a) and the second positioning portion 46b (the second convex portion 46b) are easily arranged on the opposite sides with the protruding portion 44 interposed therebetween, as viewed from the axial direction. This further improves the accuracy of the coaxiality between the housing 40 of the electric pump device 10 and the recess 101 of the body 100 to be attached. Therefore, the sealing performance of the sealing portion 43 is more stable.

The positioning portion 46 (the boss portion 46) overlaps the inverter case 60 as viewed in the axial direction. The inverter case 60 is disposed on the other axial side of the housing 40. For example, in contrast to the configuration in which the positioning portion 46 is disposed radially outward of the inverter case 60 as viewed in the axial direction, unlike the present embodiment, the outer diameter of the flange portion 42 can be reduced in the present embodiment. Therefore, the electric pump device 10 can be downsized.

As shown in fig. 3, the length L2 in the axial direction in which the positioners 46 and the mounting surface positioners 111 are fitted, i.e., the length L2 in the axial direction in which the protrusions 46 are inserted into the insertion holes 111, is smaller than the length L1 in the axial direction in which the protrusions 44 are inserted into the input port 102. According to the present embodiment, when assembling the electric pump device 10 and the mounted body 100, the protruding portion 44 can be first fitted to the input port 102, and then the positioning portion 46 can be fitted to the mounting surface positioning portion 111. Therefore, the electric pump device 10 and the mounted body 100 are more easily assembled.

As shown in fig. 4, the hole 51 is disposed in the flange main body 42 b. The hole 51 is recessed from an end surface 42a of the flange 42 facing one axial side toward the other axial side. The hole 51 has a circular hole shape with a top. The pin portion 52 is disposed on the flange main body 42 b. The pin portion 52 is fixed to the flange portion 42 by fitting into the hole portion 51, and projects from the end face 42a toward one axial side. That is, the pin portion 52 is fixed to the hole portion 51 by press-fitting. The pin portion 52 has a cylindrical shape. The convex portion 46 (positioning portion 46) is a portion of the pin portion 52 that protrudes from the end surface 42a to one axial side. As shown in fig. 5, the pin portion 52 is press-fitted into the hole portion 51 using a columnar press-fitting jig 200. The length of the press-fitting jig 200 in the axial direction is smaller than the length of the housing body 41 in the axial direction.

According to the present embodiment, the convex portion 46 is constituted by the pin portion 52. The pin portion 52 is press-fitted into the flange portion 42 of the housing 40, not into the mounting surface 110 of the attached body 100, and therefore the pin portion 52 can be erected in the axial direction with high accuracy. That is, the outer shape of the housing 40 is smaller and lighter than the mounted body 100, and therefore, handling as a member is easy, and the work of pressing the pin portion 52 into the flange portion 42 is easy. Therefore, the press-fitting accuracy of the pin portion 52 can be stably improved. Thus, assembly becomes easier, and the coaxiality of the housing 40 with the recess 101 improves. Further, the press-fitting jig 200, press-fitting equipment, and the like for press-fitting the pin portion 52 into the flange portion 42 can be manufactured compactly, easily, and inexpensively.

As shown in fig. 1 to 4, the mounting hole 48 is disposed in the mounting portion 42 c. The mounting hole 48 axially penetrates the flange portion 42. A plurality of mounting holes 48 are provided. The mounting holes 48 are disposed in the mounting portions 42 c. The screw member 105 is inserted into the mounting hole 48.

Fig. 6 is a vertical cross-sectional view showing a first modification of the electric pump device 10 and the mounting structure 80 of the electric pump device according to the present embodiment. In the first modification, the corner portion 104 of the body 100 to be mounted has the inclined surface 104c located radially inward as it goes to one axial side. The seal portion 43 is disposed between the inclined surface 104c of the corner portion 104 and the corner portion 47 of the housing 40. In this case, the corner portion 104 is easily processed, and the sealing property of the sealing portion 43 is stabilized.

Fig. 7 is a vertical cross-sectional view showing a second modification of the electric pump device 10 and the mounting structure 80 of the electric pump device according to the present embodiment. In the second modification, the cross section of the seal portion 43 in the radial direction is rectangular. In this case, the posture of the sealing portion 43 disposed at the corner portion 104 of the mounted body 100 is stabilized. The contact area of the seal portion 43 with the bottom wall 104a and the inner peripheral wall 104b increases. Therefore, the sealing performance of the sealing portion 43 is stabilized.

Fig. 8 is a vertical cross-sectional view showing a third modification of the electric pump device 10 and the mounting structure 80 of the electric pump device according to the present embodiment. In the third modification, the seal portion 49 has a plate shape, and the pair of plate surfaces face in the axial direction. The seal portion 49 is in the form of an annular plate centered on the first center axis J1. The seal portion 49 is disposed at a corner portion 47 where the outer peripheral surface of the housing body portion 41 and the end surface 42a of the flange portion 42 facing the one axial side are connected. Seal portion 49 is disposed between corner portion 104 and corner portion 47. Sealing portion 49 seals between corner portion 104 and corner portion 47. In this case, it is not necessary to process the corner portion 104 of the mounted body 100 for disposing the seal portion 49.

As shown in fig. 3, the inverter case 60 houses the inverter 50. The inverter case 60 has a bus bar holder 61 and a cover 62. The bus bar holder 61 is fixed to the other axial side of the housing 40. The bus bar holder 61 holds the wiring member 56 and the bus bar 58. The bus bar holder 61 is manufactured by insert molding using the wiring member 56 and the bus bar 58 as an insert member, for example. The bus bar holder 61 includes a bottom wall portion 61a, a bearing holder 61e, an annular portion 61b, a support portion 61c, and a connector portion 61 d.

The bottom wall portion 61a is plate-shaped and extends in a direction perpendicular to the first center axis J1. The bottom wall portion 61a is fixed to the other surface of the housing 40 in the axial direction. The bearing holder 61e is cylindrical and fixed to the bottom wall portion 61 a. The bearing holder 61e is made of metal. The bearing holder 61e holds the second bearing 12. The second bearing 12 is fitted in the bearing holder 61 e. The annular portion 61b protrudes from the radially outer edge portion of the bottom wall portion 61a toward the other axial side. The annular portion 61b is annular surrounding the first center axis J1. The support portion 61c is disposed radially inward of the annular portion 61b and projects from the bottom wall portion 61a toward the other axial side. A plurality of supporting portions 61c are provided. The connector portion 61d is provided on the radially outer surface of the annular portion 61 b. As shown in fig. 2, the connector portion 61d protrudes from the annular portion 61b in the direction (+ Y side) from the second center axis J2 toward the first center axis J1 in the inter-axial direction. For example, the connector portion 61d is connected to an external power supply that supplies power to the stator portion 26.

As shown in fig. 3, the cover 62 is fixed to the other axial side of the bus bar holder 61. The cover 62 has a plurality of heat radiating fins 62 a.

The circuit board 55 has a plate shape with a plate surface facing in the axial direction. The circuit substrate 55 is located on the other axial side of the stator 26. The circuit substrate 55 is supported from the axial side by the plurality of support portions 61c, and is fixed to the plurality of support portions 61c by screws, respectively. Thereby, the circuit substrate 55 is supported by the bus bar holder 61. The other surface of the circuit board 55 in the axial direction is located on the other side in the axial direction than the annular portion 61 b.

The wiring member 56 and the bus bar 58 are connected to the circuit substrate 55. A part of the wiring member 56 is embedded in and held by the bus bar holder 61. The wiring member 56 is an elongated plate-like member. A plurality of wiring members 56 are provided. The wiring member 56 passes through the inside of the connector portion 61 d. The wiring member 56 has a terminal portion (not shown) exposed from the connector portion 61d to the outside of the inverter case 60. The wiring member 56 is electrically connected to an external power supply connected to the connector portion 61d via a terminal portion.

A part of the bus bar 58 is embedded in and held by the bus bar holder 61. The bus bar 58 is an elongated plate-like member. A plurality of bus bars 58 are provided. The bus bar 58 is connected to a lead-out portion 29c extending from the coil 29 to the other axial side. Thus, the wiring member 56 is electrically connected to the stator 26 via the circuit board 55 and the bus bar 58.

The inverter 50 is electrically connected to the motor 20. The inverter 50 is mounted on the circuit board 55. In the present embodiment, the inverter 50 is mounted on one surface of the circuit board 55 in the axial direction. The inverter 50 has a plurality of transistors 50 a. For example, the transistor 50a is a field effect transistor. The inverter 50 is electrically connected to the stator portion 26 via a bus bar 58 connected to the circuit board 55.

The capacitor 57 is an electronic component mounted on the other surface of the circuit board 55 in the axial direction. The capacitor 57 protrudes from the circuit board 55 toward the other side in the axial direction. The capacitor 57 is cylindrical and extends along a virtual plane (not shown) perpendicular to the first center axis J1. The capacitor 57 is electrically connected to the inverter 50 via the circuit board 55. Thus, the capacitor 57 is electrically connected to the stator portion 26 via the circuit board 55, the inverter 50, and the bus bar 58.

As shown in fig. 1, the vent tube 59 is provided in the cap 62. The breather pipe 59 has a breathing hole (not shown). The breather pipe 59 has a function of discharging air inside the inverter case 60 to the outside through a breather hole.

The present invention is not limited to the above-described embodiments, and for example, as described below, changes in the configuration and the like can be made without departing from the scope of the present invention.

In the above-described embodiment, the pin portion 52 is fixed to the hole portion 51 by press-fitting, and the portion of the pin portion 52 that protrudes from the end surface 42a to one axial side is the convex portion 46 (positioning portion 46). The boss 46 and flange 42 may be portions of a single member. In this case, the convex portion 46 is provided integrally with the flange portion 42, for example, when the case body portion 41 is cast.

Further, the respective components (constituent elements) described in the above-described embodiments, modifications, comments, and the like may be combined or addition, omission, replacement, and other modifications of the components may be made without departing from the scope of the present invention. The present invention is not limited by the embodiments described above, but is defined only by the claims.

Claims

1. An electric pump device, comprising:

a motor having a shaft extending along a first central axis;

a pump section driven by the motor; and

a casing accommodating the motor and the pump part and having

The housing includes:

a housing main body portion having a bottomed cylindrical shape and extending in an axial direction;

a flange portion extending radially outward from an outer peripheral surface of the housing main body portion; and

a protrusion extending from a bottom of the housing main body toward one axial side,

the second central axis of the protruding portion is arranged at a position radially offset from the first central axis,

the flange portion has a protruding portion that protrudes toward one axial side from an end surface of the flange portion that faces one axial side.

2. The electric pump device according to claim 1,

the flange portion includes:

a hole portion recessed from an end surface of the flange portion facing one axial side to the other axial side; and

a pin portion that is fixed to the flange portion by being fitted into the hole portion and that protrudes from the end surface toward one axial side,

the convex portion is a portion of the pin portion that protrudes from the end surface to one side in the axial direction,

the convex portion is provided with at least one at the flange portion.

3. The electric pump device according to claim 1,

defining a direction in which a virtual straight line passing through the first central axis and the second central axis extends, as an inter-axis direction, when the housing is viewed from an axial direction,

the convex portion is arranged in a direction from the second center axis toward the first center axis in the inter-axis direction than the protruding portion.

4. The electric pump device according to claim 2,

5. The electric pump device according to claim 1,

the flange portion is provided with two of the convex portions.

6. The electric pump device according to claim 2,

the flange portion is provided with two of the convex portions.

7. The electric pump device according to claim 5,

the two convex parts are a first convex part and a second convex part,

the housing is viewed from the axial direction and,

two tangent lines which pass through a third central axis of the first convex part and are tangent with the peripheral surface of the protruding part are a first tangent line and a second tangent line,

a normal line passing through a first tangent point that is a tangent point of the outer peripheral surface of the protruding portion to the first tangent line and extending from the first tangent line toward an opposite direction of the second center axis is a first normal line,

a normal line passing through a second tangent point that is a tangent point of the outer peripheral surface of the protruding portion and the second tangent line and extending from the second tangent line toward an opposite direction of the second center axis is a second normal line,

defining a direction in which a virtual straight line passing through the first central axis and the second central axis extends as an inter-axis direction,

the second convex portion is arranged in a direction from the first center axis toward the second center axis in the inter-axis direction with respect to the first normal line and the second normal line.

8. The electric pump device according to claim 1, characterized by comprising:

an inverter electrically connected to the motor; and

an inverter case accommodating the inverter and

the inverter case is disposed on the other side in the axial direction of the housing,

the convex portion overlaps with the inverter case as viewed in the axial direction.

9. A mounting structure of an electric pump apparatus, characterized by comprising:

the electric pump device according to claim 1; and

an attached body to which the electric pump device is attached, and

the mounted body includes:

a mounting surface facing the other axial side and contacting an end surface of the flange portion facing the one axial side;

a recess into which the housing main body is inserted, the recess being recessed from the mounting surface toward one axial side; and

an input port opened at a bottom surface of the recess and extending in an axial direction for insertion of the protrusion,

the inner peripheral surface of the recess and the outer peripheral surface of the housing main body portion are opposed to each other with a gap in the radial direction,

the mounting surface has an insertion hole recessed toward one side in the axial direction from the mounting surface,

the protrusion is inserted into the insertion hole and contacts the insertion hole.

10. The mounting structure of an electric pump apparatus according to claim 9,

the length of the protruding portion in the axial direction inserted into the insertion hole is smaller than the length of the protruding portion in the axial direction inserted into the input port.