JP7331541B2 - electric pump device - Google Patents

Description

The present invention relates to an electric pump device. This application claims priority based on Japanese Patent Application No. 2018-185800 filed on September 28, 2018, and the content thereof is incorporated herein.

An electric pump device includes a motor, a substrate, a housing, and a pump. In the electric compressor of Patent Document 1, the base member is fixed to the motor housing, and the multilayer substrate is fixed to a pedestal formed so as to protrude from the flat portion of the base member into the driving device accommodating portion.

JP 2016-118183 A

The conventional substrate fixing structure has room for improvement in terms of suppressing the vibration of the substrate. If the vibration damping property of the board is low, it may affect the durability of the solder that joins the coil ends of the motor and the board.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide an electric pump device capable of improving the vibration damping properties of the inverter board and increasing the durability of the solder that fixes the ends of the coil and the inverter board. be one.

One aspect of the electric pump device of the present invention includes a motor, an inverter board electrically connected to the motor, a housing housing the motor and the inverter board, and a pump section driven by the power of the motor. and, the housing includes a motor housing portion that accommodates the motor, and an inverter housing portion that accommodates the inverter board, the motor housing portion extending inside the inverter housing portion and the It has a strut portion fixed to the inverter board.
Further, one aspect of the electric pump device of the present invention includes a motor, an inverter board electrically connected to the motor, a housing housing the motor and the inverter board, and a motor driven by the power of the motor. a pump unit, wherein the motor includes a rotor having a shaft extending along a central axis; a stator radially facing the rotor; and a plurality of bearings rotatably supporting the shaft. , the housing has a bearing retaining wall portion disposed on one axial side of the stator and on the other axial side of the inverter board to retain at least one bearing; The portion has a recess recessed toward the other side in the axial direction from the surface of the bearing holding wall portion facing the one side in the axial direction. It has an electronic component protruding to the side, said electronic component being inserted into said recess.
Further, one aspect of the electric pump device of the present invention includes a motor, an inverter board electrically connected to the motor, a coil support arranged between the motor and the inverter board, the motor, A housing that accommodates the inverter board and the coil support; and a pump section that is driven by the power of the motor. It has a stator facing each other and a plurality of bearings that rotatably support the shaft, and the housing is arranged on one axial side of the stator and on the other axial side of the inverter board. , a bearing retaining wall portion for retaining at least one bearing, the bearing retaining wall portion having a wall portion through hole axially penetrating the bearing retaining wall portion, the coil support including the coil A window portion axially penetrates through the support, the wall portion through-hole and the window portion are arranged to overlap each other when viewed in the axial direction, and the inverter board faces the other side of the inverter board in the axial direction. It has an electronic component protruding from the plate surface to the other side in the axial direction, and the electronic component is inserted into at least one of the wall portion through-hole and the window portion.

According to the electric pump device of one aspect of the present invention, the damping property of the inverter board can be improved, and the durability of the solder that fixes the ends of the coil and the inverter board can be enhanced.

1 is a perspective view showing a motor unit and an electric pump device according to a first embodiment; FIG. FIG. 2 is a front view showing the motor unit and the electric pump device of the first embodiment. FIG. 3 is a longitudinal sectional view showing the III-III section of FIG. FIG. 4 is a rear view (plan view) showing the motor unit and the electric pump device of the first embodiment, showing a state in which the first member of the inverter housing section and the like are removed from the device. FIG. 5 is a vertical cross-sectional view showing a V-V cross section of FIG. 6 is a longitudinal sectional view showing a VI-VI section of FIG. 4. FIG. FIG. 7 is a rear view showing the motor unit and the electric pump device of the first embodiment, showing a state where the inverter housing portion, the inverter board, etc. are removed from the device. 8 is a longitudinal sectional view showing a VIII-VIII section of FIG. 7. FIG. FIG. 9 is a side view schematically showing the vicinity of the first end of the coil. FIG. 10 is a plan view showing a modification of the heat conductive sheet. FIG. 11 is a longitudinal sectional view showing part of the motor unit and the electric pump device of the first modified example of the first embodiment. FIG. 12 is a longitudinal sectional view showing part of the motor unit and the electric pump device of the second modified example of the first embodiment. FIG. 13 is a vertical cross-sectional view showing a motor unit and an electric pump device according to the second embodiment.

<First embodiment>
A motor unit 10 and an electric pump device 1 including the same according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 12. FIG. The drawing shows an XYZ coordinate system as a three-dimensional orthogonal coordinate system as appropriate. Motor unit 10 and electric pump device 1 include motor 20 and inverter board 40 . The motor 20 has a central axis J, and the central axis J extends along the Z-axis direction. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction." The axial position of the motor 20 and the axial position of the inverter board 40 are different from each other. That is, the motor 20 and the inverter board 40 are arranged in the axial direction. Of the axial directions, the direction from the motor 20 to the inverter board 40 is called one axial direction side (+Z side), and the direction from the inverter board 40 to the motor 20 is called the other axial direction side (-Z side). A radial direction centered on the central axis J is simply referred to as a “radial direction”. Of the radial directions, the direction closer to the central axis J is called the radial inner side, and the direction away from the central axis J is called the radial outer side. The circumferential direction around the central axis J, that is, the circumference of the central axis J is simply referred to as the "circumferential direction". In this embodiment, "parallel directions" include substantially parallel directions, and "perpendicular directions" include substantially perpendicular directions.

The electric pump device 1 of the present embodiment sucks and discharges a fluid such as oil. The electric pump device 1 has, for example, a function of circulating fluid in a flow path. If the fluid is oil, the electric pump device 1 may be called an electric oil pump device. Although not shown, the electric pump device 1 is provided in, for example, a drive device of a vehicle. That is, the electric pump device 1 is mounted on the vehicle.

As shown in FIGS. 1 to 9, the motor unit 10 includes a housing 11, a fastening screw 18, a fixing screw 19, a motor 20, an inverter board 40, a wiring member 50, a screw member 60, and a coil support. 80 and. The electric pump device 1 includes a motor unit 10 , a pump section 90 and a pump cover 95 . Specifically, the electric pump device 1 includes a housing 11, a fastening screw 18, a fixing screw 19, a motor 20, an inverter board 40, a wiring member 50, a screw member 60, a coil support 80, and a pump section 90. , and a pump cover 95 . In this embodiment, the pair of plate surfaces of the inverter board 40 face the axial direction. One of the pair of plate surfaces of the inverter board 40 faces one side in the axial direction. The other of the pair of plate surfaces of the inverter board 40 faces the other side in the axial direction. In the present embodiment, "as seen from the axial direction" has the same meaning as "in a plan view of the inverter board 40".

Housing 11 accommodates motor 20 and inverter board 40 . Housing 11 has motor housing portion 12 , oil seal 32 , shaft portion 33 , inverter housing portion 13 , and breather portion 14 . Motor housing portion 12 accommodates motor 20 . In this embodiment, the motor housing portion 12 also houses the pump portion 90 . That is, the housing 11 also accommodates the pump section 90 . According to this embodiment, the motor 20 and the pump section 90 are accommodated in the motor housing section 12, so the structure of the electric pump device 1 can be simplified. Assembly of the electric pump device 1 is facilitated.

The motor housing portion 12 is made of metal. The motor housing portion 12 is constructed from a single member. The motor housing portion 12 has a housing cylinder portion 12a, a collar portion 12b, a pump housing wall portion 12c, a bearing holding cylinder portion 12d, and a strut portion 12g.

The housing cylinder portion 12a has a tubular shape extending in the axial direction. In this embodiment, the housing cylinder portion 12a is cylindrical. A motor 20 is housed in the housing cylinder portion 12a. The collar portion 12b spreads radially outward from one axial end portion of the housing cylinder portion 12a. The flange portion 12b has a plate-like shape with a plate surface facing the axial direction. In this embodiment, the outer shape of the flange portion 12b is substantially polygonal when viewed from the axial direction.

The collar portion 12b has a breather mounting hole 12i, a breather housing recess 12j, a claw support surface 12k, an outer surface 12l, and a shaft mounting hole 12m (see FIGS. 5 and 6). The breather mounting hole 12i axially penetrates the flange portion 12b. The breather mounting hole 12i has a tapered hole-shaped portion whose inner diameter increases toward the other side in the axial direction. The breather mounting hole 12i overlaps with a wiring member arrangement region 13a, which will be described later, when viewed from the axial direction.

The breather housing recess 12j is recessed toward one side in the axial direction from the surface of the collar portion 12b facing the other side in the axial direction. When viewed from the axial direction, the breather housing recess 12j has a circular ring shape. The inner diameter of the breather housing recess 12j is larger than the inner diameter of the breather mounting hole 12i. The bottom surface of the breather housing recess 12j facing the other side in the axial direction is connected to the inner peripheral surface of the breather mounting hole 12i.

The claw portion support surface 12k is arranged on the surface of the collar portion 12b facing one side in the axial direction. In this embodiment, the claw support surface 12k is a plane perpendicular to the central axis J. As shown in FIG. The pawl support surface 12k has a substantially annular shape when viewed from the axial direction, and surrounds the breather mounting hole 12i from the outside (see FIG. 7). An inner peripheral portion of the claw portion support surface 12k is connected to an end portion (opening portion) on one side in the axial direction of the breather mounting hole 12i.

12 l of outer surrounding surfaces are arrange|positioned at the surface which faces the axial direction one side of the collar part 12b. The outer surface 12l is substantially C-shaped when viewed from the axial direction. 12 l of outer surrounding surfaces surround the claw part support surface 12k from the outer side of the breather radial direction, seeing from an axial direction. Note that the breather radial direction is a radial direction centered on the breather central axis C, as will be described later. The outer surface 12l is located on the other side in the axial direction with respect to the claw support surface 12k. That is, the axial position of the outer peripheral surface 12l is on the other side in the axial direction with respect to the axial position of the claw support surface 12k.

The shaft portion mounting hole 12m is recessed toward the other side in the axial direction from the surface of the collar portion 12b facing the one side in the axial direction. The shaft attachment hole 12m extends in the axial direction. The shaft attachment hole 12m is circular.

The pump housing wall portion 12c is arranged at the end portion on the other side in the axial direction of the cylindrical housing portion 12a. The pump housing wall portion 12c is arranged inside the housing cylinder portion 12a. The pump housing wall portion 12c closes the opening on the other side in the axial direction of the cylindrical housing portion 12a. The pump housing wall portion 12c has a plate-like shape with a plate surface facing the axial direction. In this embodiment, the pump housing wall portion 12c is substantially disc-shaped. The pump accommodation wall portion 12 c accommodates the pump portion 90 . The pump housing wall portion 12c has a pump housing hole 12f and a plurality of lightening holes (not shown).

The pump housing hole 12f is recessed toward one side in the axial direction from the plate surface facing the other side in the axial direction of the pump housing wall portion 12c. In this embodiment, the pump housing hole 12f is circular. 12 f of pump accommodation holes are arrange|positioned in the center part of the pump accommodation wall part 12c seeing from an axial direction. Although not shown in particular, the plurality of lightening holes are recessed toward the other side in the axial direction from the plate surface facing the one side in the axial direction of the pump accommodating wall portion 12c, and are spaced apart from each other in the circumferential direction. The plurality of lightening holes are arranged radially outside the pump housing hole 12f.

The bearing holding tubular portion 12d has a tubular shape extending from the pump housing wall portion 12c to one side in the axial direction. The bearing holding cylindrical portion 12d protrudes to the one axial side from the plate surface facing the one axial side of the pump housing wall portion 12c. The bearing holding tubular portion 12d holds a first bearing 35 of the motor 20, which will be described later. The first bearing 35 is a bearing located on the other side in the axial direction of the rotor core 23 to be described later, among the plurality of bearings 35 and 36 arranged axially apart from each other in the motor 20 . The first bearing 35 is fitted in the bearing holding tubular portion 12d.

The strut portion 12g extends in the axial direction. The strut portion 12g is arranged on the collar portion 12b and extends from the collar portion 12b to one side in the axial direction. The strut portion 12g protrudes to the one axial side from the plate surface facing the one axial side of the collar portion 12b. A plurality of strut portions 12g are provided. The plurality of strut portions 12g are arranged at intervals in the circumferential direction when viewed from the axial direction. Specifically, when viewed from the axial direction, that is, when the inverter board 40 is viewed from above, the plurality of support columns 12g are arranged at positions overlapping the outer periphery of the inverter board 40 with a space therebetween.

In this embodiment, the strut portion 12g is substantially cylindrical. The outer diameter of the strut portion 12g decreases toward one side in the axial direction. The outer peripheral surface of the strut portion 12g is tapered. The strut portion 12g has a female screw portion on the inner peripheral surface of the strut portion 12g. An end surface of the support 12g facing one side in the axial direction is planar and perpendicular to the central axis J. As shown in FIG. An end face of the support 12g facing one side in the axial direction contacts a plate surface of the inverter board 40 facing the other side in the axial direction.

The strut portion 12 g is arranged inside the inverter housing portion 13 . The strut portion 12 g extends inside the inverter housing portion 13 . The column portion 12 g is fixed to the inverter board 40 . According to the present embodiment, since the inverter board 40 is fixed to the strut part 12g of the motor housing part 12, the mounting rigidity of the inverter board 40 to the housing 11 can be increased, and the vibration damping property of the inverter board 40 can be improved. . Relative vibration between the inverter substrate 40 and the stator 26 , which is fixed to the motor housing portion 12 by shrink fitting or the like, can be suppressed. Therefore, the durability of the solder 30 that fixes the first end portion 29a of the coil 29 of the stator 26, which will be described later, and the inverter board 40 can be enhanced. Moreover, the durability of the solder 31 that fixes the terminal 51 of the wiring member 50 to the inverter board 40, which will be described later, is also enhanced.

Further, according to the present embodiment, the column portion 12g axially extends from the brim portion 12b located radially outside the housing cylinder portion 12a, and supports the inverter board 40. As shown in FIG. Therefore, even if the inverter board 40 has an outer shape larger than that of the cylindrical housing portion 12a, the inverter board 40 can be stably supported by the supporting column portion 12g.

Further, according to the present embodiment, the inverter board 40 is more stably supported by the plurality of struts 12g. In addition, since the column portion 12g is arranged on the outer peripheral portion of the inverter board 40, the degree of freedom of the wiring pattern of the inverter board 40 is suppressed. Further, since the motor housing portion 12 is made of metal, the damping property of the inverter board 40 can be further improved by the motor housing portion 12 having high rigidity.

Further, according to the present embodiment, the strut portion 12g is a part of the motor housing portion 12 that is formed of a single member, that is, the strut portion 12g is provided integrally with the motor housing portion 12, so that the strut portion 12g Good sealing performance can be maintained. Therefore, it is possible to prevent water or the like from entering the inside of the motor housing portion 12 and the inverter housing portion 13 from the outside of the apparatus through the periphery of the support portion 12g. Configurations and operational effects of the strut portion 12g other than those described above will be separately described later together with the description of the inverter housing portion 13. FIG.

The oil seal 32 has an annular shape around the central axis J. As shown in FIG. The oil seal 32 is arranged inside the bearing holding tubular portion 12 d and positioned on the other side in the axial direction of the first bearing 35 . The shaft portion 33 is a pin member extending in the axial direction. The shaft portion 33 is fitted into the shaft portion mounting hole 12m. The shaft portion 33 protrudes from the collar portion 12b to one side in the axial direction.

The inverter housing portion 13 accommodates the inverter board 40 . In this embodiment, inverter housing portion 13 also houses coil support 80 . The housing 11 thus also accommodates the coil support 80 . The inverter housing portion 13 is arranged on one side in the axial direction of the flange portion 12b and overlaps the flange portion 12b when viewed in the axial direction. The inverter housing portion 13 has a first member 16, a second member 17, and a heat conductive sheet 13c. Moreover, the inverter housing part 13 has the wiring member arrangement|positioning area|region 13a and the coil support accommodation space 13b.

The first member 16 may also be called a lid member of the inverter housing portion 13 . The first member 16 is made of metal. The first member 16 is arranged on one side in the axial direction of the inverter board 40 and covers the one side in the axial direction of the inverter board 40 . The first member 16 faces one of the pair of plate surfaces of the inverter board 40 . In the axial direction, the first member 16 faces one plate surface of the inverter board 40 facing the one side in the axial direction with a gap therebetween. The first member 16 has a capped tubular shape.

The first member 16 has a top wall 16a, a peripheral wall 16b and a flange 16c. Top wall 16 a faces one plate surface of inverter board 40 . The peripheral wall 16b has a tubular shape extending from the outer peripheral portion of the top wall 16a to the other side in the axial direction. The peripheral wall 16b is arranged so as to overlap the inverter board 40 when viewed from the radial direction. The flange 16c extends radially outward from the other axial end of the peripheral wall 16b.

The second member 17 may also be called a body member of the inverter housing portion 13 . The second member 17 is axially positioned between the motor housing portion 12 and the first member 16 . That is, the second member 17 is arranged between the motor housing portion 12 and the first member 16 . The second member 17 is fixed to the collar portion 12b. The second member 17 is sandwiched between the collar portion 12b and the flange 16c in the axial direction and fixed by the fastening screw 18 . A plurality of fastening screws 18 are provided. The plurality of fastening screws 18 are arranged at intervals in the circumferential direction. According to this embodiment, since the second member 17 is fixed to the flange portion 12b, a wide area for fixing the inverter housing portion 13 to the motor housing portion 12 can be secured, and the inverter housing portion 13 can be stably attached to the motor housing portion 12. can be fixed by Further, the size of the inverter housing portion 13 can be reduced in the axial direction while ensuring the internal volume of the inverter housing portion 13 .

The second member 17 is arranged on the other axial side of the inverter board 40 and covers the inverter board 40 from the other axial side. The second member 17 faces the other of the pair of plate surfaces of the inverter board 40 . The second member 17 faces the other plate surface of the inverter board 40 facing the other side in the axial direction with a gap in the axial direction. The second member 17 has a cylindrical shape with a bottom.

The second member 17 has a bottom wall portion 17a and a peripheral wall portion 17b. That is, the inverter housing portion 13 has a bottom wall portion 17a and a peripheral wall portion 17b. Bottom wall portion 17 a faces the other plate surface of inverter board 40 . That is, the bottom wall portion 17a faces the plate surface of the pair of plate surfaces of the inverter board 40 that faces the other side in the axial direction. The bottom wall portion 17a has a plate shape with a plate surface facing the axial direction. The bottom wall portion 17a is fixed to the collar portion 12b by a fixing screw 19. As shown in FIG. That is, the second member 17 is fixed to the motor housing portion 12 with the fixing screws 19 . A plurality of fixing screws 19 are provided. The plurality of fixing screws 19 are arranged at intervals in the circumferential direction. The fixing screw 19 is used for the purpose of temporarily fixing the second member 17 to the motor housing portion 12 until the inverter housing portion 13 and the motor housing portion 12 are fastened with the fastening screw 18 . Temporary fixation refers to a temporary fixation state required for assembly. The number of fixing screws 19 is less than the number of fastening screws 18 . Since the second member 17 is fixed to the motor housing portion 12 with the fixing screws 19, it is held by the inverter board 40 fixed to the support column portion 12g of the motor housing portion 12 and the connector portion 17i of the second member 17, which will be described later. The relative position of the wiring member 50 to the terminal 51 is stable, and the terminal 51 can be easily connected to the inverter board 40 .

The bottom wall portion 17a includes a bearing holder 17c, a wave washer 17g, a fitting cylinder portion 17d, a through hole 17e, a rib portion 17f, a pin portion 71, a boss portion 17j, an insertion hole 17k, and a breather housing. It has a wall portion 17l and a tubular portion arrangement hole 17m. That is, the second member 17 has a bearing holder 17c, a through hole 17e and a boss portion 17j. Further, the pin portion 71 is provided on the inverter housing portion 13 .

The bearing holder 17c is made of metal. When injection molding the second member 17, the bearing holder 17c is placed in a mold (not shown) together with another metal part. The second member 17 is insert-molded together with the bearing holder 17c by filling the mold with molten resin and solidifying it. That is, the second member 17 has a portion made of resin. According to the present embodiment, since the second member 17 has a portion made of resin, the flexibility of the shape of the second member 17 is increased. Therefore, a connector portion 17i and the like, which will be described later, can be easily provided on the second member 17 .

The bearing holder 17c has a truncated tubular shape. The bearing holder 17c holds at least one bearing 36 among a plurality of bearings 35, 36 of the motor 20, which will be described later. The bearing holder 17c holds the second bearing 36 . The second bearing 36 is one of the plurality of bearings 35 and 36 located on one side in the axial direction of the rotor core 23 to be described later. The second bearing 36 fits within the bearing holder 17c. That is, the bottom wall portion 17 a holds at least one bearing 36 . The bottom wall portion 17 a may also be referred to as the bearing holding wall portion 55 . That is, the housing 11 has the bearing retaining wall portion 55 . The bearing holding wall portion 55 is arranged on one axial side of the stator 26 and arranged on the other axial side of the inverter board 40 . The bearing holding wall portion 55 is positioned between the stator 26 and the inverter board 40 in the axial direction. The bearing holding wall portion 55 has a wall portion through hole 55a that penetrates the bearing holding wall portion 55 in the axial direction. A plurality of wall through-holes 55 a may be provided in the bearing holding wall 55 .

The wave washer 17g has an annular shape centered on the central axis J. As shown in FIG. The wave washer 17g is disposed within the bearing holder 17c and is axially positioned between the top wall of the bearing holder 17c and the second bearing 36. As shown in FIG. The wave washer 17g contacts the top wall of the bearing holder 17c and the second bearing 36 in the axial direction. Between the bearing holder 17c and the second bearing 36, the wave washer 17g biases them axially away from each other.

The fitting tube portion 17d has a tubular shape extending from the bottom wall portion 17a to the other side in the axial direction. The fitting tube portion 17d fits into the housing tube portion 12a. In this embodiment, the fitting tube portion 17d is cylindrical and fits inside one end (opening) of the housing tube portion 12a in the axial direction. According to this embodiment, the fitting cylinder portion 17d of the bottom wall portion 17a is fitted into the housing cylinder portion 12a of the motor housing portion 12, so that the bearing 36 held by the bearing holder 17c of the bottom wall portion 17a is It is coaxially aligned with the central axis J of shaft 22 . Therefore, the performance of the motor 20 is stabilized.

The through hole 17e axially penetrates the bottom wall portion 17a. In this embodiment, the through hole 17e is circular. A plurality of through holes 17e are provided. The plurality of through holes 17e are arranged at intervals in the circumferential direction when viewed from the axial direction. More specifically, when viewed from the axial direction, that is, when the inverter board 40 is viewed from above, the plurality of through holes 17e are arranged at positions overlapping the outer peripheral portion of the inverter board 40 and spaced apart from each other. A support 12g is inserted into each through hole 17e. In other words, the column portion 12g is inserted into the through hole 17e. According to the present embodiment, by passing the strut portion 12g through the through hole 17e of the second member 17, it is possible to easily ensure the sealing performance between the inverter housing portion 13 and the motor housing portion 12. FIG. In addition, the inverter housing portion 13 and the motor housing portion 12 can be roughly aligned, improving the ease of assembly.

Here, the support|pillar part 12g is demonstrated. The strut portion 12g penetrates through the second member 17 . The strut portion 12g penetrates the bottom wall portion 17a of the second member 17 in the axial direction. According to this embodiment, the strut portion 12g can be arranged inside the inverter housing portion 13 with a simple configuration. Then, the inverter board 40 can be supported by the supporting column portion 12g. The strut portion 12g is arranged inside the peripheral wall portion 17b when viewed from the axial direction. The strut portion 12g protrudes to one side in the axial direction from the peripheral wall portion 17b when viewed in the radial direction. According to the present embodiment, the inverter board 40 supported by the tip of the column portion 12g is arranged on one side in the axial direction of the peripheral wall portion 17b of the second member 17 . That is, the other plate surface of the inverter board 40 is located on one side in the axial direction of the peripheral wall portion 17b. Therefore, when the first end portion 29a of the coil 29 and the terminal 51, which will be described later, are soldered to the inverter board 40, whether the solders 30 and 31 have appropriately reached the other board surface of the inverter board 40, That is, it is possible to easily confirm whether or not the soldering has been successfully performed by visual inspection from the radial direction.

The rib portion 17f protrudes from the plate surface facing the one axial side of the bottom wall portion 17a to the one axial side and extends along a virtual plane (not shown) perpendicular to the central axis J. As shown in FIG. A plurality of rib portions 17f are provided. The plurality of rib portions 17f radially extend around the central axis J. As shown in FIG. In the present embodiment, the plurality of rib portions 17f includes rib portions 17f extending in the radial direction and rib portions 17f extending in directions other than the radial direction when viewed from the axial direction. The plurality of rib portions 17f are arranged at intervals in the circumferential direction. A radially outer end of the rib portion 17f is connected to the peripheral wall portion 17b. The end face of the rib portion 17f facing one side in the axial direction is located on the other side in the axial direction of the end face of the peripheral wall portion 17b facing one side in the axial direction.

The pin portion 71 extends axially. The pin portion 71 extends axially to one side from the bottom wall portion 17a. In this embodiment, the pin portion 71 is provided integrally with one rib portion 17f among the plurality of rib portions 17f. That is, the pin portion 71 and one rib portion 17f are a single member portion. The pin portion 71 is located between the radial inner end portion and the radial outer end portion of one rib portion 17f.

The pin portion 71 is inserted into a positioning hole portion 43 (described later) of the inverter board 40 . One axial end of the pin portion 71 is inserted into the positioning hole portion 43 . The end portion of the pin portion 71 on one side in the axial direction protrudes to the one side in the axial direction from the end surface of the support portion 12g on the one side in the axial direction. When viewed from the axial direction, the pin portion 71 faces at least one support 12g among the plurality of support 12g with a gap therebetween. That is, the pin portion 71 is arranged close to at least one support portion 12g with a gap when viewed from the axial direction. The outer diameter of the pin portion 71 gradually decreases from the bottom wall portion 17a toward one side in the axial direction. According to this embodiment, the inverter board 40 and the inverter housing portion 13 can be aligned by inserting the pin portions 71 into the positioning holes 43 of the inverter board 40 . Further, when the inverter board 40 is fixed to the post portion 12g with the screw member 60, the inverter board 40 can be prevented from rotating together with the screw member 60, and the inverter board 40 can be prevented from rotating with respect to the inverter housing portion 13. can be suppressed.

The boss portion 17j protrudes from the bottom wall portion 17a toward one side in the axial direction. The boss portion 17j extends in the axial direction. The boss portion 17j is cylindrical or columnar. In this embodiment, the boss portion 17j is cylindrical. The boss portion 17j has a planar tip surface that is perpendicular to the central axis J and faces one side in the axial direction of the boss portion 17j. The tip surface of the boss portion 17j is in contact with or faces the other plate surface of the inverter board 40 with a gap therebetween. Boss portion 17 j can support the other plate surface of inverter board 40 . In a plan view of the inverter board 40 , the boss portion 17 j is arranged in the central portion of the inverter board 40 . In a plan view of the inverter board 40, the bearing holder 17c and the boss portion 17j are arranged to overlap each other.

The insertion hole 17k is recessed toward one side in the axial direction from the surface of the bottom wall portion 17a facing the other side in the axial direction. The insertion hole 17k extends axially. The insertion hole 17k overlaps with the shaft portion mounting hole 12m and the shaft portion 33 when viewed in the axial direction. The shaft portion 33 is inserted into the insertion hole 17k. According to this embodiment, the second member 17 is radially positioned with respect to the motor housing portion 12 by fitting the fitting tube portion 17d into the housing tube portion 12a. Further, the second member 17 is circumferentially positioned with respect to the motor housing portion 12 by inserting the shaft portion 33 into the insertion hole 17k. Thereby, the relative positions of the motor housing portion 12 and the inverter housing portion 13 are stably determined, and the first end portion 29a of the coil 29 and the terminal 51 to be described later can be easily connected to the inverter board 40 . Further, when viewed from the axial direction, the shaft portion 33 and the pin portion 71 are arranged so as to overlap each other. According to this embodiment, since the shaft portion 33 and the pin portion 71 are arranged coaxially, the alignment structure using them can be space-saving.

The breather housing wall portion 17l is recessed toward one side in the axial direction from the surface of the bottom wall portion 17a facing the other side in the axial direction. The breather housing wall portion 17l has a topped tubular shape. The breather housing wall portion 17l has a peripheral wall and a top wall. A peripheral wall of the breather housing wall portion 17l extends from the bottom wall portion 17a toward one side in the axial direction. The top wall of the breather housing wall portion 17l closes the opening on one side in the axial direction of the peripheral wall of the breather housing wall portion 17l. The breather housing wall portion 17l overlaps the breather mounting hole 12i when viewed from the axial direction. The tubular portion arrangement hole 17m axially penetrates the bottom wall portion 17a. A later-described extended tubular portion 85b of the coil support 80 is arranged inside the tubular portion arrangement hole 17m.

The peripheral wall portion 17b has a tubular shape extending from the outer peripheral portion of the bottom wall portion 17a to one side in the axial direction. In this embodiment, the peripheral wall portion 17b has a substantially polygonal cylindrical shape. The peripheral wall portion 17b has a spacer 17h and a connector portion 17i. That is, the inverter housing portion 13 has a connector portion 17i.

The spacer 17h has a tubular shape extending in the axial direction. In this embodiment, the spacer 17h is cylindrical. The spacer 17h is provided on the peripheral wall portion 17b and passes through the second member 17 in the axial direction. A plurality of spacers 17h are provided. The plurality of spacers 17h are arranged at intervals in the circumferential direction. A fastening screw 18 is inserted into each spacer 17h. The spacer 17h is made of metal. When injection molding the second member 17, the spacer 17h is placed in a mold (not shown) together with another metal part. The second member 17 is insert-molded together with the spacer 17h by filling the mold with molten resin and solidifying it.

An external power source (not shown) is connected to the connector portion 17i. The connector portion 17i is cylindrical. In this embodiment, the connector portion 17i has a rectangular tubular shape. The connector portion 17i extends from the peripheral wall portion 17b toward the outside of the peripheral wall portion 17b when viewed in the axial direction. The connector portion 17i protrudes outward from the peripheral wall portion 17b along a virtual plane (not shown) perpendicular to the central axis J. As shown in FIG. In this embodiment, the direction in which the connector portion 17i protrudes from the peripheral wall portion 17b may be referred to as the protruding direction. The projecting direction of the connector portion 17i is the +X side. The side opposite to the projecting direction is the -X side. Also, the direction orthogonal to the projecting direction when viewed from the axial direction may be called the width direction. The width direction is the Y-axis direction. The connector portion 17i is arranged at a position different from the central axis J in the width direction. In the width direction, the direction from the central axis J to the connector portion 17i is called one width direction side (+Y side), and the direction from the connector portion 17i to the central axis J is called the other width direction side (−Y side).

The connector portion 17i and the peripheral wall portion 17b are parts of a single member. A portion of the wiring member 50 is arranged inside the connector portion 17i. The connector portion 17 i is fixed to the wiring member 50 . The connector portion 17i holds the wiring member 50 .

The wiring member arrangement area 13 a is a space in which the wiring member 50 is arranged in the inverter housing portion 13 . The wiring member arrangement area 13a is positioned between the central axis J and the connector portion 17i in the projecting direction in a plan view of the inverter board 40 in the internal space of the inverter housing portion 13 . That is, the wiring member arrangement area 13a is positioned between the central axis J and the connector portion 17i when viewed from the axial direction. The wiring member arrangement area 13a is located on the projecting direction (+X side) of the central axis J and on the opposite side (−X side) of the connector portion 17i to the projecting direction.

Coil support accommodation space 13 b is arranged inside inverter housing portion 13 . The coil support accommodation space 13b accommodates the coil support 80. As shown in FIG. The coil support accommodation space 13b is a space in the internal space of the inverter housing portion 13 in which the coil support 80 is arranged. The coil support accommodation space 13b has an annular shape centered on the central axis J. As shown in FIG. The coil support accommodation space 13b overlaps the stator 26 when viewed from the axial direction. The coil support accommodation space 13b is positioned radially inside the fitting tube portion 17d. The coil support accommodation space 13b is a groove-like space that is recessed in one axial direction from the surface of the bottom wall portion 17a facing the other axial side and extends in the circumferential direction.

The heat-conducting sheet 13c is plate-shaped, and a pair of plate surfaces face the axial direction. The heat conductive sheet 13c is an elastic sheet member. The thermally conductive sheet 13c has, for example, a rectangular plate shape. The heat conductive sheet 13 c is arranged between the first member 16 or the second member 17 and the inverter board 40 and contacts the first member 16 or the second member 17 and the inverter board 40 . In this embodiment, the heat conductive sheet 13 c is arranged between the first member 16 and the inverter board 40 and contacts the first member 16 and the inverter board 40 . Specifically, the heat-conducting sheet 13 c is arranged between the top wall 16 a and one plate surface of the inverter board 40 and contacts the top wall 16 a and one plate surface of the inverter board 40 . Although not shown in particular, when the thermally conductive sheet 13c is arranged between the second member 17 and the inverter board 40 and contacts the second member 17 and the inverter board 40, the thermally conductive sheet 13c is located on the bottom wall portion. 17 a and the other plate surface of the inverter board 40 , and are in contact with the other plate surface of the inverter board 40 and the other plate surface of the inverter board 40 . do. The thermally conductive sheet 13c is thermally connected to a heating element 46 of the inverter board 40, which will be described later. The heat-conducting sheet 13c has a function of transferring the heat of the heating element 46 to another member by thermal conduction to cool the heating element 46. As shown in FIG. Configurations and effects of the heat conductive sheet 13c other than those described above will be separately described later together with the description of the inverter board 40. FIG.

The breather portion 14 communicates the inside and the outside of the housing 11 . The breather portion 14 is provided on the flange portion 12b of the motor housing portion 12 and is exposed from the housing 11 toward the other side in the axial direction to the outside of the device. That is, the breather portion 14 is arranged on the collar portion 12b. The collar portion 12b is covered from one axial side by the inverter housing portion 13, and faces the other axial side, that is, the side of a vehicle member (not shown) to which the electric pump device 1 is fixed. Therefore, the flange portion 12b is surrounded by the inverter housing portion 13 and the member of the vehicle in the axial direction. According to the present embodiment, it is possible to suppress direct contact with the breather portion 14 by water droplets and the like that are scattered due to running of the vehicle or the like. Therefore, the members inside the housing 11 are less likely to come into contact with water or the like, and the functions of the inverter board 40, the motor 20, etc. are maintained satisfactorily.

The breather portion 14 is arranged at a position not overlapping a leg portion 97 of the pump cover 95, which will be described later, when viewed from the axial direction. According to this embodiment, since the breather portion 14 does not overlap the leg portion 97 in the axial direction, for example, the seal function of the housing 11 is inspected from the attachment point of the breather portion 14, that is, the breather attachment hole 12i of the flange portion 12b. Cheap. That is, it is easy to attach a jig or the like of an inspection device (not shown) to the breather attachment hole 12i and to easily remove it. Also, after inspection, the breather portion 14 can be easily attached to the breather attachment hole 12i.

The breather portion 14 is arranged at a position overlapping the wiring member arrangement region 13a of the flange portion 12b when viewed from the axial direction. In the present embodiment, the breather portion 14 is arranged on the other widthwise side (-Y side) of the center axis J in the wiring member arrangement region 13a. Note that the breather portion 14 may be arranged on one widthwise side (+Y side) of the central axis J in the wiring member arrangement region 13a. Since the wiring member arrangement area 13a accommodates the wiring member 50, a large space can be easily secured. According to the present embodiment, the breather portion 14 is arranged at a position overlapping the wiring member arrangement region 13a in the collar portion 12b when viewed from the axial direction, so that the empty space of the housing 11 can be effectively used, and the structure of the apparatus is improved. By optimizing the arrangement of the members, the electric pump device 1 can be miniaturized.

Although not particularly shown, the breather portion 14 is arranged vertically above the center of the electric pump device 1 when the electric pump device 1 is attached to a member of the vehicle. Therefore, submersion of the breather portion 14 can be suppressed. Also, the high-temperature air in the housing 11 can be easily released to the outside of the device through the breather portion 14 . The fact that the breather portion 14 is arranged above the center of the electric pump device 1 in the vertical direction can also be explained using the relative positional relationship between an inlet port 96a and an outlet port 96b of the pump cover 95, which will be described later. This description will be given later together with the description of the pump cover 95 .

The breather portion 14 has a breather main body 14a, a breather cylindrical portion 14b, a claw portion 14c, and a breather seal member 14e. The breather main body 14a is disc-shaped with an internal space. In the following description, the central axis of the breather main body 14a will be referred to as the breather central axis C. As shown in FIG. The breather central axis C extends parallel to the central axis J, that is, extends in the axial direction. A radial direction centered on the breather central axis C is called a breather radial direction. In the breather radial direction, the direction approaching the breather central axis C is called the inside in the breather radial direction, and the direction away from the breather central axis C is called the outside in the breather radial direction. The circumferential direction around the breather central axis C, that is, the circumference of the breather central axis C is called the breather circumferential direction.

The surface of the breather main body 14a facing one side in the axial direction faces the bottom surface of the breather housing recess 12j facing the other side in the axial direction with a gap in the axial direction. The outer peripheral surface of the breather main body 14a faces the inner peripheral surface of the breather housing recess 12j with a gap in the breather radial direction. The breather body 14a has a portion that is accommodated within the breather accommodation recess 12j.

The breather main body 14a has a breathing hole 14d. The breathing hole 14 d communicates with the outside of the housing 11 . The breathing hole 14d communicates with the internal space of the breather main body 14a. A plurality of breathing holes 14d are provided at intervals in the circumferential direction of the breather. The plurality of breathing holes 14d has a breathing hole 14d extending in the radial direction of the breather and a breathing hole 14d extending in the axial direction. The plurality of breathing holes 14d has a breathing hole 14d that opens to the outer peripheral surface of the breather body 14a and a breathing hole 14d that opens to the surface of the breather body 14a facing one side in the axial direction.

The breather tubular portion 14b has a tubular shape extending in the axial direction. The breather tubular portion 14b is connected to the breather main body 14a. The breather tubular portion 14b is connected to a surface of the breather main body 14a facing the one side in the axial direction, and extends from the breather main body 14a toward the one side in the axial direction. The breather tubular portion 14b is inserted into the breather mounting hole 12i. The breather tubular portion 14b communicates with the breathing hole 14d through the internal space of the breather main body 14a. That is, the breather tube portion 14b communicates with the breathing hole 14d. Breather tubular portion 14b communicates with the interior of inverter housing portion 13 through through hole 17e of bottom wall portion 17a and the like. That is, the breather tubular portion 14 b communicates with the inside of the housing 11 .

The claw portion 14c protrudes outward in the breather radial direction from one axial end portion of the breather tubular portion 14b. A plurality of claw portions 14c are provided at intervals in the circumferential direction. The claw portion 14c contacts the flange portion 12b from one side in the axial direction. The claw portion 14c contacts the claw portion support surface 12k of the flange portion 12b from one side in the axial direction. That is, the claw portion 14c contacts the claw portion support surface 12k. The claw portion 14c is hooked on the claw portion support surface 12k by a snap-fit structure or the like. According to the present embodiment, since the claw support surface 12k is arranged on one side in the axial direction of the outer peripheral surface 12l, the claw support surface 12k can be easily machined with a cutting tool or the like. As a result, the axial position of the claw support surface 12k and the accuracy of the machined surface are ensured. Then, the claw portion 14c can be stably hooked on the claw portion support surface 12k. In addition, the fixed state of the breather portion 14 to the collar portion 12b becomes more stable.

Here, the breather accommodating wall portion 17l accommodates the end portion of the breather cylinder portion 14b on one axial side and the claw portion 14c, and covers the breather cylinder portion 14b from one axial direction side. The top wall of the breather housing wall portion 17l faces the one axial end portion of the breather cylindrical portion 14b and the claw portion 14c from one axial side with a gap therebetween. The peripheral wall of the breather housing wall portion 17l faces the one axial end portion of the breather cylindrical portion 14b and the claw portion 14c from the outside in the breather radial direction with a gap therebetween. According to this embodiment, even if water or the like enters the housing 11 through the breather portion 14 from the outside of the device, the breather housing wall portion 17l can prevent the electronic components and the like in the housing 11 from being directly exposed to the water or the like. .

The breather seal member 14e is, for example, an O-ring. The breather seal member 14e contacts the outer peripheral surface of the breather tubular portion 14b, the surface of the breather main body 14a facing one side in the axial direction, and the inner peripheral surface of the breather mounting hole 12i. According to the present embodiment, the breather seal member 14e prevents water or the like from entering the housing 11 through the space between the breather cylindrical portion 14b and the breather mounting hole 12i. Moreover, the attachment state of the breather portion 14 to the collar portion 12b is more stable.

The motor 20 has a rotor 21 , a stator 26 and a plurality of bearings 35 and 36 . The rotor 21 has a shaft 22 , a rotor core 23 , magnets 24 and magnet holders 25 .

The shaft 22 extends along the central axis J. The shaft 22 extends axially around the central axis J. As shown in FIG. The shaft 22 rotates around the central axis J. As shown in FIG. The shaft 22 is rotatably supported around the central axis J by a plurality of bearings 35 and 36 . That is, the plurality of bearings 35 and 36 rotatably support the shaft 22 . The plurality of bearings 35 and 36 are, for example, ball bearings. Among the plurality of bearings 35 and 36 , the first bearing 35 supports a portion of the shaft 22 located on the other axial side of the rotor core 23 . Of the plurality of bearings 35 and 36 , the second bearing 36 supports a portion of the shaft 22 located on one axial side of the rotor core 23 .

Rotor core 23 is fixed to the outer peripheral surface of shaft 22 . The rotor core 23 has an annular shape extending in the circumferential direction around the central axis J. As shown in FIG. The rotor core 23 has a tubular shape extending in the axial direction. The rotor core 23 is, for example, a steel plate laminate formed by laminating a plurality of electromagnetic steel plates in the axial direction.

The magnets 24 are arranged on the radial outer surface of the rotor core 23 . A plurality of magnets 24 are provided. The plurality of magnets 24 are arranged on the radially outer surface of the rotor core 23 at intervals in the circumferential direction. The magnet 24 may be, for example, one cylindrical ring magnet.

The magnet holder 25 is provided on the rotor core 23 and holds the magnets 24 . Magnet holder 25 fixes magnet 24 to rotor core 23 . The magnet holder 25 is arranged on the radial outer surface of the rotor core 23 and the surface facing the other side in the axial direction. The magnet holder 25 presses the magnet 24 from the radially outer side and the axially other side. The magnet holder 25 has a portion positioned between a pair of magnets 24 adjacent in the circumferential direction and extending in the axial direction, and a ring-shaped portion centered on the central axis J and positioned on the other side of the magnet 24 in the axial direction. , has

The stator 26 is arranged radially outside the rotor 21 and faces the rotor 21 with a gap in the radial direction. That is, the stator 26 is radially opposed to the rotor 21 . The stator 26 surrounds the rotor 21 from the outside in the radial direction over the entire circumference. The stator 26 has a stator core 27 , insulators 28 and multiple coils 29 .

The stator core 27 has an annular shape centering on the central axis J. As shown in FIG. The stator core 27 surrounds the rotor 21 on the radially outer side of the rotor 21 . The stator core 27 is arranged radially outside the rotor 21 and faces the rotor 21 with a gap in the radial direction. The stator core 27 is, for example, a steel plate laminate formed by laminating a plurality of electromagnetic steel plates in the axial direction.

The stator core 27 has a core back 27a and a plurality of teeth 27b. The core back 27a has an annular shape centering on the central axis. The core back 27a has a tubular shape extending in the axial direction. A radial outer surface of the core back 27a is fixed to an inner peripheral surface of the cylindrical housing portion 12a. The teeth 27b extend radially inward from the radial inner surface of the core back 27a. The plurality of teeth 27b are arranged on the radial inner surface of the core back 27a at intervals in the circumferential direction. The radially inner side surface of the tooth 27b faces the radially outer side surface of the magnet 24 from the radially outer side with a gap therebetween.

The insulator 28 is attached to the stator core 27 . The insulator 28 has a portion covering the teeth 27b. A material of the insulator 28 is, for example, an insulating material such as resin. A coil 29 is attached to the stator core 27 . Coil 29 is attached to stator core 27 via insulator 28 . The plurality of coils 29 are each configured by winding a conductive wire around each tooth 27 b via an insulator 28 .

Although not shown, the plurality of coils 29 has a first coil and a second coil. The first coil has a first conductor. The second coil has a second conductor that is different from the first conductor. That is, the first coil and the second coil are out of phase with each other. In this embodiment, the motor 20 is a three-phase motor. The three phases are U phase, V phase and W phase. In the case of a three-phase motor, the conductors forming the U-phase, V-phase, and W-phase coils 29 are different from each other. That is, the conductor wire of the U-phase coil 29, the conductor wire of the V-phase coil 29, and the conductor wire of the W-phase coil 29 are different from each other. For example, if the first coil is U-phase, the second coil is either V-phase or W-phase. When the second coil is U-phase, the first coil is either V-phase or W-phase.

The coil 29 has a pair of ends drawn out from the coil 29 at both ends of the conductor wire of the coil 29 . The pair of ends are a first end 29a and a second end 29b. The end portions 29 a and 29 b of the conductor wire of the coil 29 may be called lead portions of the coil 29 . The first end 29 a is directly connected to the inverter board 40 . The second end portion 29b is connected to a neutral point bus bar 81 of the coil support 80, which will be described later.

The first end portion 29a has a first extension portion 29c, a second extension portion 29d, and a third extension portion 29e (see FIG. 9). The first extending portion 29c extends from the coil 29 to one side in the axial direction. The second extending portion 29d is connected to the inverter board 40 and extends in the axial direction. The second extending portion 29 d is joined to the inverter board 40 using solder 30 . The third extending portion 29e connects one axial end of the first extending portion 29c and the other axial end of the second extending portion 29d and extends in a direction intersecting the central axis J. That is, in this embodiment, the first end portion 29a of the coil 29 has a plurality of bent portions 29f and 29g. Specifically, the first end portion 29a is located at a bent portion 29f located at the connecting portion between the first extending portion 29c and the third extending portion 29e, and at the connecting portion between the second extending portion 29d and the third extending portion 29e. and a positioned bend 29g. Therefore, when vibration from outside or inside the apparatus is transmitted to the first extending portion 29c, the vibration is attenuated in the process from the first extending portion 29c to the second extending portion 29d via the third extending portion 29e. be. Specifically, the amplitude of at least the axial component of the vibration is reduced and transmitted to the inverter board 40 . As a result, the load on the solder 30 joining the second extending portion 29d and the inverter board 40 is reduced, and the durability of the solder 30 is improved.

In the first end portion 29a, the conductor wire length Lb of the third extension portion 29e is longer than the conductor wire length La of the second extension portion 29d between the inverter board 40 and the third extension portion 29e. According to the present embodiment, the effect of damping vibration at the first end 29a of the coil 29 is further enhanced. The durability of the solder 30 that joins the first end portion 29a and the inverter board 40 is further improved.

The two first ends 29a shown in FIG. 9 are the first end 29a of the first coil and the first end 29a of the second coil. That is, the two first end portions 29a shown in FIG. 9 are in different phases. When viewed from the axial direction, the third extending portion 29e of the first coil and the third extending portion 29e of the second coil overlap each other, and the third extending portion 29e of the first coil and the second coil overlap each other. The third extending portion 29e of is arranged apart from each other in the axial direction. According to this embodiment, since the two third extending portions 29e overlap each other when viewed from the axial direction, the length of pulling each first end portion 29a in the direction intersecting the central axis J can be reduced. In addition, it is possible to prevent the first end portions 29a having different phases from coming into contact with each other in the axial direction. As a result, the performance of the motor 20 is favorably maintained.

The inverter board 40 is arranged on one axial side of the motor 20 . The inverter board 40 is electrically connected to an external power source (not shown) via a wiring member 50 . Inverter board 40 is electrically connected to motor 20 . The inverter board 40 supplies power supplied from an external power source to the stator 26 of the motor 20 . The inverter board 40 controls the current supplied to the motor 20 .

In a plan view of the inverter board 40, the inverter board 40 has a polygonal shape and has a plurality of corners 45a, 45b, . In this embodiment, the inverter board 40 has a substantially pentagonal shape in a plan view of the inverter board 40, and the inverter board 40 has five corners 45a, 45b, . In the present embodiment, among the plurality of corners 45a, 45b, . is called a first corner 45a. The first corner portion 45a is located on one side in the width direction of the central axis J and in the projecting direction. Further, the second corner portion 45b is a corner portion located on the other side (−Y side) in the width direction of the inverter board 40 and opposite to the projecting direction (−X side) in the plan view of the inverter board 40 . The second corner portion 45b is located on the other widthwise side of the center axis J and on the side opposite to the projecting direction. The third corner is located on the other side in the width direction of the center axis J and in the projecting direction when the inverter board 40 is viewed from above. The fourth corner and the fifth corner are located on one side in the width direction of the center axis J and on the side opposite to the projecting direction in a plan view of the inverter board 40 .

The inverter board 40 has a plurality of heating elements 46 , capacitors 47 , lead-out insertion holes 48 , terminal insertion holes 41 , screw insertion holes 42 , and positioning holes 43 . Further, the inverter board 40 has a coil connection area 40a and a terminal connection area 40b. A plurality of heating elements 46 are mounted on the inverter board 40 and arranged at intervals from each other. The heating element 46 is, for example, a field effect transistor (FET), a pre-driver, a low-loss linear regulator (Low Drop-Out regulator, LDO), or the like. In this embodiment, the heating element 46 is arranged on the other board surface of the inverter board 40 .

Here, the heat conductive sheet 13c will be described. In this embodiment, a plurality of heat conductive sheets 13c are provided. That is, the inverter housing portion 13 has a plurality of heat conductive sheets 13c. In a plan view of the inverter board 40 , the plurality of heat conductive sheets 13 c are individually arranged at positions overlapping the plurality of heat generating elements 46 . In the present embodiment, each thermally conductive sheet 13c overlaps one heating element 46 in plan view of the inverter board 40 . That is, one thermally conductive sheet 13c is arranged so as to overlap with one heating element 46 . When viewed from the axial direction, the thermally conductive sheet 13c and the heating element 46 overlap one-to-one.

For example, unlike the present embodiment, in contrast to the configuration in which a single thermally conductive sheet with a large area is brought into contact with all the heating elements 46, according to the present embodiment, the contact points between the thermally conductive sheet 13c and the inverter board 40 are are distributed and the contact area is reduced. Thereby, the reaction force of the heat conductive sheet 13c is reduced, and the deformation of the inverter board 40 is suppressed. Further, the performance of electronic components such as ceramic capacitors mounted on the inverter board 40 is maintained well. Moreover, the durability of the solder 30 that joins the first end portion 29a of the coil 29 and the inverter board 40 is further improved. The durability of the solder 31 that fixes the inverter board 40 and the terminals 51 of the wiring member 50, which will be described later, is further enhanced.

Here, FIG. 10 shows a modification of the heat conductive sheet 13c of this embodiment. In this modification, each thermally conductive sheet 13 c overlaps two heating elements 46 in plan view of the inverter board 40 . That is, one thermally conductive sheet 13c is arranged so as to overlap two heating elements 46 . In this case as well, the contact points between the heat conductive sheet 13c and the inverter board 40 are dispersed and the contact area is reduced, so deformation of the inverter board 40 is suppressed.

At least one of the plurality of heat conductive sheets 13 c is arranged between the first member 16 and the inverter board 40 and contacts the first member 16 and the inverter board 40 . In this embodiment, all of the plurality of heat conductive sheets 13 c are arranged between the first member 16 and the inverter board 40 and are in contact with the first member 16 and the inverter board 40 . According to this embodiment, when the second member 17 is attached to the motor housing portion 12 and the first member 16 is attached to the second member 17, that is, when the assembly of the inverter housing portion 13 is completed, the heat conductive sheet 13c is It contacts with the inverter board 40 . Since the inverter board 40 can be supported from both sides in the axial direction between the first member 16 and the second member 17 when the heat conductive sheet 13c contacts the inverter board 40, deformation of the inverter board 40 can be prevented. easy to suppress.

According to this embodiment, when the first member 16 is attached to the second member 17 and the thermally conductive sheet 13c presses one plate surface of the inverter board 40, the boss portion 17j pushes the other plate surface of the inverter board 40. support the face. Therefore, deformation of the inverter board 40 is further suppressed. Further, in this embodiment, the boss portion 17j is axially supported by the metal bearing holder 17c. Therefore, the inverter board 40 is stably supported by the boss portion 17j, and deformation of the inverter board 40 is further suppressed.

Although not shown, at least one of the plurality of thermally conductive sheets 13c may be arranged between the second member 17 and the inverter board 40 and come into contact with the second member 17 and the inverter board 40. good.

Capacitor 47 is one of a plurality of electronic components mounted on inverter board 40 . Capacitor 47 is arranged on the other plate surface of inverter board 40 . Capacitor 47 extends from the other plate surface of inverter board 40 toward the other side in the axial direction. The capacitor 47 has a cylindrical shape extending in the axial direction. In this embodiment, a plurality of capacitors 47 are provided. When viewed from the axial direction, the capacitor 47 is arranged overlapping the coil support 80 . The capacitor 47 may also be called the electronic component 47 . That is, the inverter board 40 has electronic components 47 . The electronic component 47 protrudes to the other axial side from the plate surface of the inverter board 40 facing the other axial side.

The drawer insertion hole 48 penetrates the inverter board 40 in its plate thickness direction (axial direction). That is, the drawer insertion hole 48 penetrates the inverter board 40 . A plurality of drawer insertion holes 48 are provided. In the present embodiment, the plurality of drawer insertion holes 48 are arranged linearly in a plan view of the inverter board 40 . The plurality of lead-out insertion holes 48 are arranged at the other end in the width direction of the inverter board 40 and arranged in the projecting direction. The first end portions 29a of the coils 29 are inserted into the lead-out portion insertion holes 48, respectively. A first end 29 a of the coil 29 is joined to the inverter board 40 with solder 30 .

The terminal insertion hole 41 penetrates the inverter board 40 in its thickness direction. That is, the terminal insertion hole 41 penetrates the inverter board 40 . A plurality of terminal insertion holes 41 are provided. In this embodiment, the plurality of terminal insertion holes 41 are arranged linearly in a plan view of the inverter board 40 . The plurality of terminal insertion holes 41 are arranged at the end of the inverter board 40 in the projecting direction (+X side) and arranged in the width direction (Y-axis direction). The terminal insertion hole 41 is arranged at the first corner 45a. In other words, of the plurality of corners 45a, 45b, . . . of the inverter board 40, the corner where the terminal insertion hole 41 is located is the first corner 45a. A terminal 51 of the wiring member 50 , which will be described later, is inserted into each terminal insertion hole 41 . Terminal 51 is joined to inverter board 40 with solder 31 .

The screw insertion holes 42 pass through the inverter board 40 in its thickness direction. That is, the screw insertion holes 42 pass through the inverter board 40 . The screw insertion hole 42 is arranged so as to overlap the female screw portion of the support 12g when viewed from the top of the inverter board 40, that is, when viewed from the axial direction. A plurality of screw insertion holes 42 are provided in the inverter board 40 . When viewed from the axial direction, each screw insertion hole 42 is arranged so as to overlap with the female screw portion of each support 12g.

The screw insertion holes 42 are arranged at a plurality of corners 45a, 45b, . . . At least one of the plurality of screw insertion holes 42 is arranged at the first corner 45a. In this embodiment, two screw insertion holes 42 are arranged in the first corner 45a. In a plan view of the inverter board 40, the terminal insertion hole 41 is arranged between the two screw insertion holes 42 of the first corner 45a. The terminal insertion hole 41 is positioned between the two screw insertion holes 42 in the width direction.

The positioning hole 43 penetrates the inverter board 40 in its thickness direction. That is, the positioning hole portion 43 penetrates the inverter board 40 in the axial direction. In this embodiment, one positioning hole 43 is provided in the inverter board 40 . The positioning hole portion 43 is arranged at a corner portion of the inverter board 40 in a plan view of the inverter board 40 . The positioning hole 43 is arranged at the first corner 45a. The positioning hole portion 43 is arranged between the terminal insertion hole 41 and the outer peripheral end surface of the inverter board 40 in a plan view of the inverter board 40 . In this embodiment, the positioning hole portion 43 is arranged in the width direction between the terminal insertion hole 41 and the outer peripheral end surface of the inverter board 40 facing one side in the width direction.

The positioning hole portion 43 is one of the two screw insertion holes 42 of the first corner portion 45 a in a plan view of the inverter board 40 , and is located on one side in the width direction of the terminal insertion hole 41 . , facing each other with a gap in the projecting direction. That is, in a plan view of the inverter board 40, the screw insertion hole 42 of the first corner portion 45a and the positioning hole portion 43 face each other with a gap therebetween.

The coil connection area 40 a is an area where the ends 29 a of the coils 29 are connected to the inverter board 40 . In the present embodiment, the coil connection region 40a is arranged on the other widthwise side (-Y side) of the center axis J in a plan view of the inverter board 40. As shown in FIG. A plurality of heating elements 46 are arranged in the coil connection region 40a. Specifically, a plurality of heating elements such as FETs are arranged in the coil connection region 40a. According to this embodiment, the ends 29a of the plurality of coils 29 connected to the inverter board 40 and the plurality of heating elements 46 are arranged close to each other, so the wiring pattern of the inverter board 40 can be shortened. Then, each heating element 46 can be individually and efficiently cooled by each heat conducting sheet 13c.

The terminal connection area 40 b is an area where a terminal 51 of the wiring member 50 , which will be described later, is connected to the inverter board 40 . In the present embodiment, the terminal connection region 40b is arranged on one side (+Y side) in the width direction and in the projecting direction (+X side) of the central axis J in a plan view of the inverter board 40 . The terminal connection area 40b is located at the first corner 45a. At least one heating element 46 is arranged in the terminal connection area 40b. In this embodiment, a plurality of heating elements 46 are arranged in the terminal connection area 40b. Specifically, a heating element such as a reverse connection protection FET or an LDO is arranged in the terminal connection region 40b. According to this embodiment, the terminals 51 connected to the inverter board 40 and the heating elements 46 are arranged close to each other, so that the wiring pattern of the inverter board 40 can be shortened. Then, the heat-generating elements 46 can be individually and efficiently cooled by the heat-conducting sheet 13c.

The wiring member 50 extends through the outside and inside of the second member 17 through the connector portion 17i. That is, the wiring member 50 extends over the outside and inside of the housing 11 . The wiring member 50 is electrically connected to an external power source (not shown). The wiring member 50 is electrically connected to the inverter board 40 . In this embodiment, the wiring member 50 is an elongated plate made of metal. The wiring member 50 may also be called a bus bar. A plurality of wiring members 50 are provided.

The wiring member 50 has terminals 51 positioned at the ends of the wiring member 50 . A terminal 51 is provided on each wiring member 50 . That is, a plurality of terminals 51 are provided. The terminal 51 is located at one of the two ends of the wiring member 50 that is located inside the housing 11 . In this embodiment, the wiring member 50 is a single member, and the terminal 51 constitutes a part of the wiring member 50 . The terminal 51 extends axially inside the inverter housing portion 13 . The terminal 51 is arranged at the first corner portion 45a of the inverter board 40 in plan view of the inverter board 40 . Terminal 51 is inserted into terminal insertion hole 41 . Terminal 51 is connected to inverter board 40 using solder 31 .

A plurality of screw members 60 are provided. The screw member 60 is inserted into the screw insertion hole 42 . The threaded member 60 has a male threaded portion. The male screw portion of the screw member 60 inserted into the screw insertion hole 42 is screwed to the female screw portion of the support 12g. That is, the screw member 60 is inserted into the screw insertion hole 42 and fixed to the support 12g. The screw member 60 fixes the inverter board 40 to the housing 11 .

At least two screw members 60 among the plurality of screw members 60 are arranged in the terminal connection area 40b. The terminal 51 is located between the two screw members 60 in a plan view of the inverter board 40 . Specifically, the terminal 51 is arranged between two screw members 60 in the width direction. According to this embodiment, relative movement between the inverter board 40 and the terminals 51 due to thermal deformation, vibration, or the like can be suppressed, and the durability of the solder 31 that fixes the inverter board 40 and the terminals 51 can be enhanced.

The coil support 80 is positioned between the motor 20 and the inverter board 40 in the axial direction. That is, the coil support 80 is arranged between the motor 20 and the inverter board 40 . In this embodiment, the coil support 80 is positioned axially between the bottom wall portion 17a, that is, the bearing holding wall portion 55, and the stator 26. As shown in FIG. Coil support 80 supports first end 29 a of coil 29 between motor 20 and inverter board 40 . The coil support 80 axially guides the first end 29 a of the coil 29 toward the inverter board 40 . Also, the coil support 80 supports the second end 29 b of the coil 29 . The coil support 80 supports the second end portion 29b with a neutral point bus bar 81, which will be described later. The coil support 80 electrically connects the second end portions 29b of the multiple coils 29 with the neutral point bus bar 81 . That is, the neutral point bus bar 81 electrically connects the multiple coils 29 together.

The coil support 80 is housed in the coil support housing space 13b. The coil support housing space 13b, the coil support 80 and the bearing 36 are arranged to overlap when viewed from the radial direction. According to this embodiment, the electric pump device 1 can be made more compact in the axial direction. The coil support 80 has a double cylindrical shape with a peak. The coil support 80 has an inner cylinder, an outer cylinder, and a top wall. The inner cylinder has a cylindrical shape extending in the axial direction. The outer cylinder has a cylindrical shape extending in the axial direction and surrounds the inner cylinder from the outside in the radial direction. The top wall has a plate shape with a plate surface facing the axial direction. The ceiling wall has a substantially annular plate shape. An inner peripheral portion of the ceiling wall is connected to the inner cylinder. An outer peripheral portion of the ceiling wall is connected to the outer cylinder. The coil support 80 is arranged so as to overlap the stator 26 when viewed from the axial direction. The coil support 80 is arranged so as to overlap with the plurality of coils 29 when viewed from the axial direction.

Neutral point bus bar 81 is made of metal. When injection-molding the coil support 80, the neutral point busbar 81 is placed in a mold (not shown). The coil support 80 is insert-molded together with the neutral point bus bar 81 by filling the mold with molten resin and solidifying it. That is, the coil support 80 has resin parts.

The neutral point bus bar 81 has a coil end holding portion 81a and a holding portion connecting bar 81b. The coil end holding portion 81 a holds the second end portion 29 b of the coil 29 . The coil end holding portion 81a is V-shaped when viewed from the axial direction. A plurality of coil end holding portions 81a are provided. The plurality of coil end holding portions 81a are arranged at intervals in the circumferential direction. The coil end holding portion 81a is arranged between the inner cylinder and the outer cylinder of the coil support 80 in the radial direction. The holding portion connecting bar 81b is embedded in the inner cylinder of the coil support 80. As shown in FIG. The holding portion connecting bar 81b has a plate shape with a plate surface facing the axial direction and extends in the circumferential direction. The holding portion connecting bar 81b is connected to the plurality of coil end holding portions 81a. The holding portion connecting bar 81b electrically connects the plurality of coil end holding portions 81a.

The coil support 80 has a first region 80a and a second region 80b. When viewed from the axial direction, the first region 80a and the second region 80b are semicircular regions (see FIG. 7). The first end 29a of the coil 29 is arranged in the first region 80a. A second end portion 29b of the coil 29 and the neutral point bus bar 81 are arranged in the second region 80b. According to the present embodiment, the first end portion 29a arranged in the first region 80a of the coil support 80 is directly connected to the inverter board 40 . In other words, unlike the prior art, no busbar member is used to connect the ends of the coils and the inverter board. Therefore, according to this embodiment, the motor 20 and the inverter board 40 can be arranged closer to each other in the axial direction. Therefore, the electric pump device 1 can be miniaturized in the axial direction. Also, the number of parts can be reduced, and the manufacturing cost is reduced.

The coil support 80 has a first wall portion 85 and a second wall portion 86 . The first wall portion 85 and the second wall portion 86 each form part of the top wall of the coil support 80 . The first wall portion 85 is arranged in the first region 80a. The plate surface of the first wall portion 85 faces the axial direction. The first wall portion 85 has a coil end insertion hole 85a, an extension tubular portion 85b, and a window portion 85c.

The coil end insertion hole 85a axially penetrates the first wall portion 85 . The coil end insertion hole 85a is circular. The first end portion 29a is inserted into the coil end insertion hole 85a. A plurality of coil end insertion holes 85a are provided. The plurality of coil end insertion holes 85a are arranged in the projecting direction (X-axis direction) in the first wall portion 85 . The extending tubular portion 85b has a tubular shape extending from the plate surface of the first wall portion 85 facing the one axial side in the axial direction. The inside of the extension tube portion 85b is part of the coil end insertion hole 85a. A plurality of extension tubular portions 85b are provided. The plurality of extension tubular portions 85b are arranged in the projecting direction on the first wall portion 85 . In the present embodiment, the pair of extension tubular portions 85b that are adjacent to each other are connected to each other at portions of the outer peripheral surfaces of the respective extension tubular portions 85b.

According to the present embodiment, the coil end insertion hole 85a can be lengthened in one axial direction by the extended tubular portion 85b. Therefore, the coil end insertion hole 85 a can guide the first end 29 a of the coil 29 closer to the inverter board 40 . Therefore, the first end portion 29 a can be easily connected to the inverter board 40 . In addition, since the axial distance along which the coil end insertion hole 85a guides the first end portion 29a is longer, it is easier to ensure the insulation of the first end portion 29a. Further, the extending tubular portion 85b is arranged inside the tubular portion arrangement hole 17m of the bottom wall portion 17a. According to this embodiment, the electric pump device 1 can be made more compact in the axial direction.

The window portion 85c axially penetrates the first wall portion 85 . That is, the coil support 80 has a window portion 85c that penetrates the coil support 80 in the axial direction. The window portion 85c overlaps with the routing portion positioned on the other axial side of the first wall portion 85 in the first end portion 29a when viewed in the axial direction. The routing portion is, for example, the third extending portion 29e. A plurality of window portions 85c are provided. In at least one of the plurality of window portions 85c, the wiring portions of the plurality of coils 29 overlap each other within the window portion 85c when viewed from the axial direction. According to the present embodiment, the routed portion of the first end portion 29a that is routed to the other side in the axial direction of the first wall portion 85 can be visually recognized through the window portion 85c. Therefore, the first end portion 29a can be routed stably. At least one of the plurality of windows 85c overlaps the wall through-hole 55a when viewed from the axial direction. That is, the wall portion through-hole 55a and the window portion 85c are arranged so as to overlap when viewed from the axial direction. The wall portion through-hole 55a and the window portion 85c are arranged adjacent to each other in the axial direction.

Here, one of the problems to be solved by the present invention will be described. 2. Description of the Related Art In recent years, there has been a demand for an electric pump device with improved rotational accuracy and rotational output of a motor and a pump section. Along with this, there has been a problem that the size of the electronic components mounted on the inverter board is increased, and the outer shape of the electric pump device is increased. SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide an electric pump device that can reduce the external size while increasing the rotational accuracy and rotational output of a motor and a pump unit.

Electronic component 47 is inserted into at least one of wall through-hole 55a and window 85c. Electronic component 47 has at least one of a portion positioned within wall through hole 55a and a portion positioned within window 85c. In this embodiment, the electronic component 47 is inserted into the wall through-hole 55a and the window 85c. That is, the electronic component 47 has a portion located inside the wall portion through-hole 55a and a portion located inside the window portion 85c. The electronic component 47 overlaps the wall through hole 55a and the window 85c when viewed from the radial direction. The electronic component 47 overlaps the wall through hole 55a and the window 85c when viewed from the circumferential direction. According to this embodiment, by inserting the electronic component 47 into at least one of the wall portion through-hole 55a and the window portion 85c, the outer shape of the electric pump device 1 can be reduced in the axial direction.

The second wall portion 86 is arranged in the second region 80b. The plate surface of the second wall portion 86 faces the axial direction. The second wall portion 86 has a coil end extraction hole 86a. The coil end extraction hole 86a axially penetrates the second wall portion 86 . The second end portion 29b is passed through the coil end extraction hole 86a. That is, the second end portion 29b is pulled out to one side in the axial direction through the coil end extraction hole 86a. A plurality of coil end extraction holes 86a are provided. The plurality of coil end extraction holes 86a are arranged at intervals in the circumferential direction. When viewed from the axial direction, the coil end extraction hole 86a and the coil end holding portion 81a overlap each other. The second wall portion 86 is located on the other axial side of the coil end holding portion 81a.

The axial position of the first wall portion 85 is on one side in the axial direction of the axial position of the second wall portion 86 . In this embodiment, the first wall portion 85 supports the first end portion 29a by means of the coil end insertion hole 85a and the extension tube portion 85b. Since the first wall portion 85 is arranged closer to the inverter board 40 in the axial direction than the second wall portion 86 , the first end portion 29 a supported by the first wall portion 85 is stably attached to the inverter board 40 . can be connected.

The connection portion between the neutral point bus bar 81 and the second end portion 29b, that is, the coil end holding portion 81a is arranged on the other side in the axial direction of the plate surface of the first wall portion 85 facing the one side in the axial direction, and It is arranged on the one side in the axial direction of the plate surface of the second wall portion 86 facing the one side in the axial direction. According to this embodiment, the size of the coil support 80 can be reduced in the axial direction, and the size of the electric pump device 1 can be reduced in the axial direction.

The pump section 90 is driven by the power of the motor 20 . The pump unit 90 sucks and discharges a fluid such as oil. The pump unit 90 is arranged on the other side in the axial direction of the motor 20 . The pump portion 90 is positioned on the other side in the axial direction of the electric pump device 1 . Although not shown, the pump unit 90 is connected to a flow path for fluid such as oil provided in a vehicle driving device or the like. Therefore, the portion of the electric pump device 1 on the other side in the axial direction where the pump portion 90 is located is fixed to a member of the vehicle.

In this embodiment, the pump section 90 has a trochoid pump structure. The pump section 90 has an inner rotor 91 and an outer rotor 92 . The inner rotor 91 and the outer rotor 92 each have a trochoidal tooth profile. The inner rotor 91 is fixed to the other axial end of the shaft 22 . The inner rotor 91 and the shaft 22 may be allowed to rotate relative to each other around the central axis J within a predetermined range. The outer rotor 92 is arranged radially outside the inner rotor 91 . The outer rotor 92 surrounds the inner rotor 91 from the outside in the radial direction over the entire circumference.

The pump cover 95 is fixed to the end of the motor housing portion 12 on the other side in the axial direction and covers the pump portion 90 from the other side in the axial direction. That is, the pump cover 95 is fixed to the housing 11 and covers the pump section 90 . The pump cover 95 is fixed to a vehicle member (not shown). A surface of the pump cover 95 facing the other side in the axial direction comes into contact with a member of the vehicle. The pump cover 95 has a cover portion 96 and leg portions 97 .

The cover portion 96 is arranged to overlap the pump portion 90 when viewed in the axial direction, and covers the pump portion 90 from the other side in the axial direction. That is, the cover portion 96 covers the pump portion 90 . The cover portion 96 has an inlet 96a and an outlet 96b. The inflow port 96a and the outflow port 96b are connected to the pump section 90, respectively. The inflow port 96a is configured by a through hole penetrating the cover portion 96 in the axial direction. The inlet 96 a allows fluid to flow into the pump section 90 . That is, the pump section 90 sucks fluid from the outside of the apparatus through the inlet 96a. The outflow port 96b is configured by a through hole penetrating the cover portion 96 in the axial direction. The outflow port 96b allows the fluid to flow out of the pump section 90. As shown in FIG. That is, the pump section 90 discharges the fluid to the outside of the device through the outflow port 96b. In this embodiment, the inflow port 96a and the outflow port 96b are aligned in the projecting direction when viewed from the axial direction.

The direction from the inflow port 96a to the outflow port 96b when viewed from the axial direction is defined as the fluid feeding direction. The breather portion 14 is arranged in the fluid feed direction with respect to the central axis J when viewed in the axial direction (see FIG. 2). In this embodiment, the fluid feed direction is the +X side, which is the same direction as the projecting direction. Therefore, the projecting direction (+X side) may be rephrased as the fluid feeding direction, and the side opposite to the projecting direction (−X side) may be rephrased as the fluid feeding direction. When the electric pump device 1 is mounted on a vehicle, the inflow port 96a is arranged vertically below the liquid surface of the fluid so as to prevent air entrapment of the fluid. The outflow port 96b is arranged vertically above the inflow port 96a. That is, the fluid feeding direction is a direction including the upper side in the vertical direction. According to this embodiment, the breather portion 14 is arranged above the center of the electric pump device 1 in the vertical direction, so submersion of the breather portion 14 in water can be suppressed. Also, the hot air inside the housing 11 can be easily released to the outside of the device through the breather portion 14 .

The leg portion 97 is connected to the cover portion 96 and arranged radially outside the cover portion 96 . The leg portion 97 protrudes radially outward from the cylindrical housing portion 12a. A plurality of leg portions 97 are provided side by side in the circumferential direction. The breather portion 14 is arranged between a pair of leg portions 97 adjacent in the circumferential direction when viewed from the axial direction. A bolt insertion hole 97 a is provided at each radially outer end of each leg 97 . The bolt insertion hole 97a penetrates the leg portion 97 in the axial direction. The electric pump device 1 is fixed to a member of the vehicle using a bolt member (not shown) inserted into the bolt insertion hole 97a.

FIG. 11 is a longitudinal sectional view showing a part of the motor unit 10 and the electric pump device 1 of the first modified example of the first embodiment. In the first modification, the electronic component 47 is inserted into either the wall portion through-hole 55a or the window portion 85c. In the illustrated example, the electronic component 47 is inserted into the wall through-hole 55a. That is, the electronic component 47 has a portion located inside the wall through hole 55a. The electronic component 47 overlaps the wall through hole 55a when viewed from the radial direction. The electronic component 47 overlaps the wall through hole 55a when viewed from the circumferential direction.

FIG. 12 is a longitudinal sectional view showing a part of the motor unit 10 and the electric pump device 1 of the second modified example of the first embodiment. In the second modification, the bottom wall portion 17a, that is, the bearing holding wall portion 55, has a recessed portion 55b that is recessed from the surface of the bearing holding wall portion 55 facing the one side in the axial direction toward the other side in the axial direction. The concave portion 55b is a bottomed hole, such as a circular hole extending in the axial direction. The electronic component 47 is inserted into the recess 55b. The electronic component 47 has a portion located within the recess 55b. The electronic component 47 overlaps the concave portion 55b when viewed from the radial direction. The electronic component 47 overlaps the concave portion 55b when viewed from the circumferential direction. According to the second modification, by inserting the electronic component 47 into the recess 55b, the outer shape of the electric pump device 1 can be made smaller in the axial direction. Note that the coil support 80 may not be provided in the second modification.

<Second embodiment>
Next, an electric pump device 2 according to a second embodiment of the invention will be described with reference to FIG. In addition, in 2nd Embodiment, the same code|symbol is attached|subjected about the same component as 1st Embodiment, and the description is abbreviate|omitted.

The electric pump device 2 of this embodiment differs from the electric pump device 1 described in the above-described first embodiment in the construction of the housing 11 and the like. In this embodiment, the opening on one axial side of the motor housing portion 12 is in direct contact with the outer peripheral portion of the first member 16 . The fastening screw 18 fixes the motor housing portion 12 and the first member 16 .

In this embodiment, the housing 11 has a bearing retaining wall portion 56 . The bearing holding wall portion 56 is made of metal. The bearing retaining wall portion 56 is constructed by a single member. The bearing holding wall portion 56 is arranged on one axial side of the stator 26 and on the other axial side of the inverter board 40 to hold at least one bearing 36 . The bearing holding wall portion 56 may be called a bearing holder. The outer peripheral portion of the bearing holding wall portion 56 is fixed to an opening portion on one axial side of the motor housing portion 12 by a screw member or the like. According to this embodiment, the rigidity of the bearing holding wall portion 56 is increased, and coaxiality between the shaft 22 supported by the bearings 36 and the stator 26 fitted in the motor housing portion 12 is ensured. Performance stabilizes. Also, the structure of the bearing holding wall portion 56 is simplified.

The bearing holding wall portion 56 has a wall portion through hole 56a that penetrates the bearing holding wall portion 56 in the axial direction. A plurality of wall through-holes 56 a are provided in the bearing holding wall 56 . At least one of the plurality of wall through-holes 56a overlaps the window 85c when viewed from the axial direction. That is, the wall portion through-hole 56a and the window portion 85c are arranged so as to overlap when viewed from the axial direction. Electronic component 47 is inserted into at least one of wall through-hole 56a and window 85c. According to this embodiment, by inserting the electronic component 47 into at least one of the wall portion through-hole 56a and the window portion 85c, the outer shape of the electric pump device 2 can be reduced in the axial direction.

It should be noted that the present invention is not limited to the above-described embodiments, and, for example, as described below, changes in configuration can be made without departing from the gist of the present invention.

In the above-described embodiment, the projecting direction and the width direction are defined in the direction along the imaginary plane (not shown) perpendicular to the central axis J, but the present invention is not limited to this. For example, regardless of the direction in which the connector portion 17i projects from the peripheral wall portion 17b, the direction parallel to the projecting direction may be called the "first direction." That is, the first direction is a predetermined direction among directions along an imaginary plane perpendicular to the central axis J. FIG. In this case, one side (+X side) in the first direction corresponds to the projecting direction, and the other side (−X side) in the first direction corresponds to the side opposite to the projecting direction. Also, the width direction may be rephrased as the “second direction”. That is, the second direction is a direction orthogonal to the first direction among directions along an imaginary plane perpendicular to the central axis J. In this case, one side in the second direction (+Y side) corresponds to one side in the width direction, and the other side in the second direction (−Y side) corresponds to the other side in the width direction. Similarly, the fluid feeding direction may also be called the "first direction".

Further, in the above-described embodiment, the capacitor 47 is used as an example of the electronic component 47, but the electronic component 47 is not limited to this. Electronic component 47 may be an electronic component other than capacitor 47 .

In addition, within the scope that does not deviate from the spirit of the present invention, each configuration (component) described in the above-described embodiments, modifications, notes, etc. may be combined, and addition, omission, replacement, and other Change is possible. Moreover, the present invention is not limited by the embodiments described above, but only by the claims.

DESCRIPTION OF SYMBOLS 1, 2... Electric pump apparatus 11... Housing 12... Motor housing part 12a... Accommodating cylindrical part 12b... Collar part 12g... Strut part 13... Inverter housing part 16... First member 17... Second Members 17a Bottom wall portion (bearing holding wall portion) 17b Peripheral wall portion 17c Bearing holder 17d Fitting cylindrical portion 17e Through hole 17k Insertion hole 19 Fixing screw 20 Motor 21 Rotor 22 Shaft 26 Stator 33 Shaft 35, 36 Bearing 40 Inverter board 43 Positioning hole 47 Capacitor (electronic component) 55, 56 Bearing holding wall , 55a, 56a... Wall portion through hole 55b... Recessed portion 71... Pin portion 80... Coil support 85c... Window portion 90... Pump portion J... Central axis

Claims (11)

a motor;
an inverter board electrically connected to the motor;
a housing that accommodates the motor and the inverter board;
a pump unit driven by the power of the motor,
The housing is
a motor housing portion that houses the motor;
and an inverter housing portion that accommodates the inverter board,
The motor housing portion has a post portion fixed to the inverter board and extending inside the inverter housing portion,
The motor is
a rotor having a shaft extending along a central axis;
a stator diametrically opposed to the rotor,
The motor and the inverter board are arranged in an axial direction,
The motor housing portion
a housing cylindrical portion in which the motor is housed;
a brim extending radially outward from one end in the axial direction of the housing cylinder,
The strut portion is arranged on the flange portion and extends from the flange portion to one side in the axial direction,
The inverter housing part is
a first member facing one of the pair of plate surfaces of the inverter board;
a second member facing the other of the pair of plate surfaces,
the second member is disposed between the motor housing portion and the first member;
The second member is fixed to the collar,
The housing has a shaft portion projecting from the flange portion to one side in the axial direction,
the second member has a bottom wall facing the other plate surface of the inverter board,
The bottom wall portion
a fitting cylinder portion extending from the bottom wall portion to the other side in the axial direction and fitted into the housing cylinder portion;
an insertion hole recessed in one axial direction from a surface facing the other axial side of the bottom wall portion and into which the shaft portion is inserted. The electric pump device according to claim 1,
A plurality of the struts are provided,
The electric pump device according to claim 1, wherein, in a plan view of the inverter board, the plurality of pillars are arranged at a position overlapping an outer peripheral part of the inverter board and spaced apart from each other. The electric pump device according to claim 1 or 2,
The electric pump device, wherein the motor housing portion is made of metal. The electric pump device according to any one of claims 1 to 3,
The electric pump device, wherein the motor housing portion is composed of a single member. The electric pump device according to any one of claims 1 to 4,
The electric pump device, wherein the strut portion penetrates the second member. The electric pump device according to claim 5,
The electric pump device, wherein the second member has a through hole into which the strut is inserted. The electric pump device according to claim 5 or 6,
The electric pump device, wherein the second member has a resin-made portion and is fixed to the motor housing portion with a fixing screw. The electric pump device according to any one of claims 5 to 7,
The second member is
a bottom wall facing the other plate surface of the inverter board;
a cylindrical peripheral wall portion extending from the outer peripheral portion of the bottom wall portion to one side in the axial direction;
The strut portion is arranged inside the peripheral wall portion when viewed from the axial direction,
The electric pump device, wherein the strut portion protrudes to one side in the axial direction from the peripheral wall portion when viewed in the radial direction. The electric pump device according to any one of claims 1 to 8,
The electric pump device, wherein the motor housing portion also accommodates the pump portion. The electric pump device according to claim 1 ,
the motor has a plurality of bearings that rotatably support the shaft;
The electric pump device, wherein the bottom wall portion has a bearing holder that holds at least one of the plurality of bearings. The electric pump device according to claim 1 or 10 ,
The inverter board has a positioning hole that axially penetrates the inverter board,
the bottom wall portion has a pin portion that extends in one axial direction from the bottom wall portion and is inserted into the positioning hole;
An electric pump device in which the shaft portion and the pin portion are arranged to overlap each other when viewed from the axial direction.

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