JP6552166B2 - Motor for electric oil pump - Google Patents

Description

  The present invention relates to a motor for an electric oil pump.

  For example, as shown in Patent Document 1, there has been proposed a rotation board for detecting a rotational position of a rotor, and a motor in which a control board on which circuit parts for controlling the motor are mounted is integrally provided together with the rotor and the stator. .

JP, 2011-68204, A

  In such a motor, there has been a problem that the size of the motor is increased by the amount of the circuit board mounted on the control board (circuit board) or the control board. In particular, there has been a problem that the motor becomes larger in the axial direction of the rotating shaft.

  For example, when an electric oil pump equipped with such a motor is installed in the engine room of a vehicle, there is a problem that the installation position of the electric oil pump in the engine room is restricted due to an increase in the size of the motor, or the installation position of the electric oil pump is There was a big problem that the distance that the oil pipe is routed becomes large due to the restriction.

  SUMMARY OF THE INVENTION One aspect of the present invention is made in view of the above problems, and includes a circuit board and a rotation sensor, and a motor for an electric oil pump provided with a structure capable of suppressing an increase in size in the axial direction. One of the purposes is to provide.

According to one aspect of the motor for an electric oil pump of the present invention, a rotor supported by a rotary shaft extending in the axial direction, a stator positioned radially outward of the rotor, and one side of the rotor in the axial direction A first bearing member for supporting the rotation shaft, a second bearing member disposed on the other axial side of the rotor and supporting the rotation shaft, the rotor, the stator, and the first bearing A motor housing that accommodates the member, a bearing bracket that holds the second bearing member and is fitted to the motor housing, and is disposed on an extension of the other side of the rotating shaft, the main surface of which is the axial direction And a bus bar that transmits a motor drive signal output from the circuit board to the stator, and a bus bar disposed outside the second bearing member in the radial direction of the rotation shaft A member, a sensor magnet disposed on the other side of the second bearing member so as to be rotatable with the rotation shaft around the rotation shaft, and disposed in the vicinity of the sensor magnet attached to the circuit board. A rotation sensor for detecting the magnetic flux of the sensor magnet, the motor housing has a bottom portion provided on the one side, a cylindrical portion opening on the other side, and the one side from the center of the bottom And the other side is provided with a first projection opening inward of the cylindrical portion, the stator is held inside the cylindrical portion, and the first projection is formed inside the first projection. A bearing member is held, and the bearing bracket includes an annular part, a second projecting part protruding from the center of the annular part to the other side, and the one side opening on a surface of the annular part, A peripheral edge extending from the outer peripheral edge of the circular ring part to the other side, the second bearing member is held on the radially inner side of the second protrusion, and the peripheral part is the motor. Fitted to the inner peripheral surface of the cylindrical portion of the housing, the bearing bracket is located on the radially outer side of the second bearing member, and the annular portion, the second projecting portion, and the peripheral portion And the bus bar member is disposed in the annular recess, the bus bar member has a substantially annular shape, and the bus bar member extends in the radial direction on the second protrusion. An inner diameter portion fitted from the outside, and a sensor positioning portion provided on the other side of the inner diameter portion to position the rotation sensor , at least a part of the circuit component attached to the circuit board is the sensor The diameter of the magnet It is located in the outward direction.

  According to one aspect of the motor for an electric oil pump of the present invention, a rotor supported by a rotary shaft extending in the axial direction, a stator positioned radially outward of the rotor, and one side of the rotor in the axial direction A first bearing member for supporting the rotation shaft, a second bearing member disposed on the other axial side of the rotor and supporting the rotation shaft, the rotor, the stator, and the first bearing A motor housing that accommodates the member, a bearing bracket that holds the second bearing member and is fitted to the motor housing, and is disposed on an extension of the other side of the rotating shaft, the main surface of which is the axial direction And a bus bar that transmits a motor drive signal output from the circuit board to the stator, and a bus bar disposed outside the second bearing member in the radial direction of the rotation shaft A member, a sensor magnet disposed on the other side of the second bearing member so as to be rotatable with the rotation shaft around the rotation shaft, and disposed in the vicinity of the sensor magnet attached to the circuit board. A rotation sensor for detecting the magnetic flux of the sensor magnet, the motor housing has a bottom portion provided on the one side, a cylindrical portion opening on the other side, and the one side from the center of the bottom And the other side is provided with a first projection opening inward of the cylindrical portion, the stator is held inside the cylindrical portion, and the first projection is formed inside the first projection. A bearing member is held, the bearing bracket includes a ring portion, and a second projection portion which protrudes from the center of the ring portion to the other side and the one side opens to the surface on the one side of the ring portion; A peripheral edge portion extending from the outer peripheral edge of the annular portion to the other side, the second bearing member is held on the radially inner side of the second projection, and the peripheral edge is the motor The inner peripheral surface of the cylindrical portion in the housing is fitted, and the bearing bracket is located on the radially outer side of the second bearing member, and the annular portion, the second protrusion, and the peripheral portion And the bus bar member is disposed in the annular recess, the bus bar member is substantially annular, and the bus bar member is disposed in the radial direction in the second projection. An inner diameter portion fitted from the outside, and a sensor positioning portion provided on the other side of the inner diameter portion to position the rotation sensor are characterized.

  According to one aspect of the present invention, there is provided a motor for an electric oil pump provided with a structure capable of suppressing an increase in size in the axial direction while being provided with a circuit board and a rotation sensor.

It is a sectional view showing a motor for electric oil pumps of a 1st embodiment. It is sectional drawing which shows the motor for electric oil pumps of 1st Embodiment, Comprising: It is the elements on larger scale of FIG. It is a perspective view which shows the part of the motor for electrically driven oil pumps of 1st Embodiment. It is sectional drawing which shows the motor for electric oil pumps of 2nd Embodiment. It is sectional drawing which shows the motor for electric oil pumps of 3rd Embodiment. It is sectional drawing which shows the motor for electric oil pumps of 4th Embodiment.

  Hereinafter, a motor for an electric oil pump according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure intelligible, a scale, the number, etc. in an actual structure and each structure may be varied.

Further, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system, the Z-axis direction is the axial direction of the shaft 31 shown in FIG. 1, and the X-axis direction is the connector portion 60b of the inverter housing 60 shown in FIG. The extending direction, that is, the left-right direction in FIG. 1, is taken as the Y-axis direction which is orthogonal to both the X-axis direction and the Z-axis direction. In the following description, the positive side (+ Z side) in the Z-axis direction is taken as the rear side (the other side), and the negative side (−Z side) in the Z-axis direction is taken as the front side (one side). Also, about the axis of shaft 31 and theta _Z direction. Moreover, unless otherwise noted, in the following description, the axial direction shall mean the axial direction of the shaft 31. Moreover, unless otherwise noted, in the following description, the radial direction shall mean the radial direction of the shaft 31.

First Embodiment
1 to 3 are views showing a motor 10 for an electric oil pump according to the present embodiment. FIG. 1 is a cross-sectional view. FIG. 2 is a partial enlarged cross-sectional view in FIG. FIG. 3 is a perspective view. In FIG. 3, illustration of some components such as the motor housing 20 is omitted.

  The motor for an electric oil pump of the present embodiment is a brushless motor. As shown in FIG. 1, the motor 10 for an electric oil pump includes a motor housing 20, a bearing bracket 40, a shaft (rotary shaft) 31, a rotor 30 supported by the shaft 31, a stator 34, and a front bearing ( A first bearing member 39a, a rear bearing (second bearing member) 39b, a bus bar member 50, an inverter housing (support member) 60, a control device 70, and a lid 90 are provided.

  The rotor 30, the stator 34 and the front bearing 39a are accommodated in the motor housing 20. The motor housing 20 is open at the rear side (+ Z side), and the bearing bracket 40 is fitted in the opening 25 of the motor housing 20. The rear bearing 39 b is held by the bearing bracket 40. The shaft 31 is supported on both sides in the axial direction (Z-axis direction) by a front bearing 39a and a rear bearing 39b.

  A lid 90 is fixed to the rear side of the motor housing 20, that is, the opening 25 side via an inverter housing 60. The bus bar member 50 and the control device 70 are accommodated in a region surrounded by the lid portion 90, the inverter housing 60 and the bearing bracket 40. Each component will be described in detail below.

[Motor housing]
The motor housing 20 accommodates the rotor 30, the stator 34 and the front bearing 39a inside. The motor housing 20 includes a cylindrical portion 21, a front bearing holding portion (first protrusion) 22, and a flange portion 23. In the present embodiment, the motor housing 20 is formed, for example, by press-forming a steel plate.

  In the present specification, the rotor 30, the stator 34 and the front bearing 39a are accommodated in the motor housing 20, the whole of the rotor 30, the whole of the stator 34 and the whole of the front bearing 39a inside the motor housing 20. The present invention does not include the case where the position of the motor housing 20 is located, and also includes the case where a part of the rotor 30, the stator 34 and the front bearing 39a is located outside the motor housing 20.

  The cylindrical portion 21 is a bottomed cylinder that opens to the rear side (+ Z side). The cylindrical portion 21 has a circular bottom 24 provided on the front side (−Z side). The bottom portion 24 has a through hole 24 a at the center. The stator 34 is held inside the cylindrical portion 21.

  The front bearing holding portion 22 protrudes from the periphery of the through hole 24a of the bottom portion 24 to the front side (−Z side). In other words, the front bearing holder 22 projects from the center of the bottom 24 to the front side. The front bearing holding portion 22 is a cylinder concentric with the cylindrical portion 21. The rear side (+ Z side) of the front bearing holding portion 22 is open to the inside of the cylindrical portion 21. A front bearing 39 a is held radially inward of the front bearing holding portion 22. The front bearing holding part 22 has a circular bottom plate part 22a on the front side (−Z side). The bottom plate portion 22a has an output shaft hole 22b at the center.

  The flange portion 23 extends radially outward from the end on the rear side (+ Z side) of the cylindrical portion 21. The flange portion 23 has a through hole 23 a into which a male screw 66 for fixing the motor housing 20 and the lid portion 90 is inserted. Although illustration is omitted, a plurality of through holes 23a are provided.

  Note that, in the present specification, “extending radially outward or radially inward” does not include only the case of strictly extending in the radial direction, but in a direction inclined by less than 45 ° with respect to the radial direction. It also includes the case of extension.

[Bearing bracket]
The bearing bracket 40 is a member that holds the rear bearing 39b. The bearing bracket 40 is press-fit into the opening 25 of the cylindrical portion 21 in the motor housing 20. In other words, the bearing bracket 40 is fitted to the motor housing 20. The bearing bracket 40 is located on the rear side (+ Z side) of the stator 34. In the present embodiment, the bearing bracket 40 is formed by, for example, press forming a steel plate.

  In the present embodiment, the entire bearing bracket 40 is located on the radially inner side of the flange portion 23 in the motor housing 20. The bearing bracket 40 includes an annular part 41, a rear bearing holding part (second projecting part) 42, and a peripheral part 43. Moreover, the bearing bracket 40 is provided with the pressing part (contact part) 44a and the pressing part (contact part) 44b as several pressing part (contact part), as shown in FIG.

  The annular portion 41 is concentric with the cylindrical portion 21 of the motor housing 20, as shown in FIG. The annular portion 41 is provided with a through hole 41 b. Although illustration is omitted, in the present embodiment, three through holes 41b are provided at equal intervals in the circumferential direction.

  The rear bearing holding part 42 protrudes from the inner peripheral edge 41 c of the annular part 41 to the rear side (+ Z side). In other words, the rear bearing holding portion 42 protrudes from the center of the annular portion 41 to the rear side. The rear bearing holder 42 is a cylinder concentric with the front bearing holder 22. The front side (−Z side) of the rear bearing holding portion 42 is open to the front surface 41 a on the front side of the annular portion 41. The rear bearing holding portion 42 has a circular top plate portion 42 a on the rear side. The top plate portion 42a has a through hole 42b at the center. A rear bearing 39 b is held inside the rear bearing holding portion 42.

  The peripheral portion 43 cylindrically extends from the outer peripheral edge of the annular portion 41 to the rear side (+ Z side). The peripheral portion 43 is fitted to the inner peripheral surface 21 a of the cylindrical portion 21 in the motor housing 20. In the present embodiment, the peripheral portion 43 is press-fitted to the inner peripheral surface 21 a of the cylindrical portion 21. In the present embodiment, in the axial direction (Z-axis direction), the rear end of the peripheral edge portion 43 is provided at a position closer to the front (−Z side) than the rear end of the cylindrical portion 21.

  The bearing bracket 40 is provided with an annular recess 45 surrounded by the annular portion 41, the rear bearing holding portion 42 and the peripheral portion 43. The annular recess 45 is located radially outside of the rear bearing holding portion 42, that is, radially outside of the rear bearing 39 b held by the rear bearing holding portion 42.

The pressing portion 44 a and the pressing portion 44 b protrude radially inward from an end portion on the rear side (+ Z side) of the peripheral portion 43 as shown in FIGS. 1 and 3. The plurality of pressing portions, that is, the pressing portion 44 a and the pressing portion 44 b are provided to be separated from each other in the circumferential direction of the peripheral edge portion 43. In the present embodiment, for example, pressing portion 44b, to the pressing portion 44a, are provided at a position rotated by approximately 120 ° about the axis (theta _Z direction).

  The pressing portions 44 a and 44 b contact the rear side (+ Z side) surface of the bus bar member 50. More specifically, the pressing portions 44 a and 44 b contact the rear surface of the portion of the bus bar member 50 located in the annular recess 45. Thereby, the bus bar member 50 can be fixed to the bearing bracket 40.

[Shaft and rotor]
The shaft 31 is centered on a central axis J extending in the Z-axis direction. That is, the shaft 31 extends in the Z-axis direction (axial direction). Shaft 31 by a front bearing 39a and a rear bearing 39 b, and is rotatably supported about the axis (theta _Z direction).

The front end (−Z side) end of the shaft 31 protrudes from the output shaft hole 22 b of the bottom plate portion 22 a of the front bearing holding portion 22 to the outside of the motor housing 20.
An end portion on the rear side (+ Z side) of the shaft 31 protrudes to the rear side of the rear bearing holding portion 42 through a through hole 42 b of the top plate portion 42 a in the rear bearing holding portion 42.

The rotor 30 includes a rotor core 32 and a rotor magnet 33, as shown in FIG.
The rotor core 32 surrounds the shaft 31 about the axis (theta _Z direction), and is fixed to the shaft 31. Thus, the rotor 30 is supported by the shaft 31.

The rotor magnet 33 is fixed to the outer circumferential surface along about the axis of the rotor core 32 (theta _Z direction).
The rotor 30, that is, the rotor core 32 and the rotor magnet 33 rotate integrally with the shaft 31.

[Stator]
The stator 34 is located on the radially outer side of the rotor 30. The stator 34 surrounds the rotor 30 about the axis (theta _Z direction). The stator 34 is located inside the cylindrical portion 21 of the motor housing 20 on the front side (−Z side) relative to the bearing bracket 40. The stator 34 includes a core back portion 35, teeth portions 36, a coil portion 37, and a bobbin 38.

  The core back portion 35 has a cylindrical shape concentric with the shaft 31. The outer peripheral surface of the core back portion 35, that is, the outer peripheral surface of the stator 34 is fitted to the inner peripheral surface 21 a of the cylindrical portion 21 of the motor housing 20.

Teeth portion 36 extends from the inner circumferential surface of core back portion 35 toward shaft 31. A plurality of teeth portions 36 are provided, and are arranged at equal intervals in the circumferential direction of the inner peripheral surface of the core back portion 35.
The coil portion 37 is configured by winding a conductive wire around the bobbin 38.
The bobbins 38 are attached to the teeth 36.

[Front and rear bearings]
The front bearing 39 a is held by the front bearing holding portion 22 of the motor housing 20. That is, the front bearing 39a is disposed on the front side (−Z side) of the rotor 30 in the axial direction.

  The rear bearing 39 b is held by the rear bearing holding portion 42 of the bearing bracket 40. That is, the rear bearing 39b is disposed on the rear side (+ Z side) of the rotor 30 in the axial direction.

That is, the stator 34 is disposed between the front bearing 39a and the rear bearing 39b in the axial direction (Z-axis direction). The front bearing 39a and the rear bearing 39b support the shaft 31 as described above.
The configurations of the front bearing 39a and the rear bearing 39b are not particularly limited, and any known bearing may be used.

[Bus bar material]
The bus bar member 50 is disposed outside the rear bearing 39 b in the radial direction of the shaft 31. More specifically, the bus bar member 50 is disposed in the annular recess 45. The bus bar member 50 has a substantially annular shape.

  In the present specification, the term “substantially annular” means not only a strictly annular shape but also a slightly distorted elliptical shape or a portion protruding from an annular portion. Including the case.

  As shown in FIG. 1, the bus bar member 50 has an inner diameter portion 51, a cap portion 52, a sensor holding portion 53, a bus bar holding portion 56, a circuit board wiring member 55a, a bus bar 55b, and a stator wiring member And 55c. Further, as shown in FIG. 3, the bus bar member 50 includes a sensor positioning portion 54a, a sensor positioning portion 54b, and a sensor positioning portion 54c.

In the present embodiment, the inner diameter portion 51, the cap portion 52, the sensor holding portion 53, the sensor positioning portions 54a to 54c, and the bus bar holding portion 56 are made of resin.
As shown in FIG. 1, the inner diameter portion 51 is fitted to the rear bearing holding portion 42 of the bearing bracket 40 from the radially outer side. In the present embodiment, the inner diameter portion 51 is a cylinder concentric with the rear bearing holding portion 42.

  The cap portion 52 extends radially inward from an end portion on the rear side (+ Z side) of the inner diameter portion 51. As shown in FIG. 2, the cap portion 52 is in contact with the outer edge portion of the rear end surface 42 c of the top plate portion 42 a of the rear bearing holding portion 42. That is, the cap portion 52 covers a part of the rear end surface 42 c of the rear bearing holding portion 42.

The sensor holding portion 53 extends from the radial inner end portion of the cap portion 52 to the rear side (+ Z side).
The sensor positioning portions 54a, 54b, 54c are provided in the sensor holding portion 53, as shown in FIG. That is, the sensor positioning portions 54 a to 54 c are provided on the rear side of the inner diameter portion 51. The sensor positioning portions 54a to 54c are portions for positioning rotation sensors 74a to 74c described later.

  The sensor positioning portions 54 a to 54 c protrude radially outward from the sensor holding portion 53. The sensor positioning portions 54 a to 54 c are provided at equal intervals in the circumferential direction of the sensor holding portion 53. The sensor positioning portion 54a is provided with a sensor positioning recess 57a opening inward in the radial direction. The sensor positioning portion 54b is provided with a sensor positioning recess 57b opening inward in the radial direction. The sensor positioning portion 54a is provided with a sensor positioning recess 57c that opens inward in the radial direction.

  In the present embodiment, as shown in FIG. 1 and FIG. 3, the sensor holding portion 53 and the sensor positioning portions 54 a to 54 c are located radially outside of a sensor magnet 81 described later. That is, a part of the bus bar member 50 is located outside the sensor magnet 81 in the radial direction.

  The bus bar holding part 56 is provided around the inner diameter part 51. The bus bar holding portion 56 is substantially annular in plan view (in the XY plane). The bus bar holding portion 56 is fitted in the annular recess 45 of the bearing bracket 40. The bus bar holding part 56 holds the circuit board wiring member 55a, the bus bar 55b, and the stator wiring member 55c. As shown in FIG. 3, on the rear side (+ Z side) surface of the bus bar holding portion 56, a plurality of local concave portions 56a are provided. In other words, the bus bar member 50 includes the local recessed portion 56 a on the rear side.

  As shown in FIG. 1, the circuit board wiring member 55a extends in the axial direction (Z-axis direction), and the end on the rear side (+ Z side) is connected to a circuit board 71 described later. The front side (−Z side) end of the circuit board wiring member 55 a is embedded in the bus bar holding portion 56.

  The bus bar 55b connects the circuit board wiring member 55a and the stator wiring member 55c. The bus bar 55b is substantially embedded inside the bus bar holding portion 56, and extends mainly in a plane orthogonal to the axial direction (Z-axis direction). Although not shown, the bus bar 55 b is electrically connected to the circuit board wiring member 55 a at a portion embedded in the bus bar holding portion 56.

  One end of the bus bar 55 b protrudes to the rear side (+ Z side) of the bus bar holding portion 56. The bus bar 55 b is electrically connected to the stator wiring member 55 c at a portion protruding to the rear side of the bus bar holding portion 56. In the present embodiment, three bus bars 55b are provided as shown in FIG. The portions of the three bus bars 55 b that protrude to the rear side of the bus bar holding portion 56 are arranged at equal intervals along the circumferential direction of the bus bar holding portion 56.

  As shown in FIG. 1, stator wiring member 55 c extends in the axial direction (Z-axis direction), and penetrates bus bar holding portion 56 in the axial direction. The rear side (+ Z side) end portion of the stator wiring member 55c protrudes to the rear side of the bus bar holding portion 56 and is connected to the bus bar 55b. An end portion on the front side (−Z side) of the stator wiring member 55 c protrudes on the front side of the annular portion 41 via the through hole 41 b of the annular portion 41 in the bearing bracket 40. The front end of the stator wiring member 55 c is electrically connected to the coil portion 37 of the stator 34. In the present embodiment, as shown in FIG. 3, three stator wiring members 55c are provided corresponding to the bus bars 55b.

  Thereby, the circuit board 71 and the stator 34 described later are electrically connected via the circuit board wiring member 55a, the bus bar 55b, and the stator wiring member 55c, and the motor output from the circuit board 71 The drive signal is transmitted to the stator 34. That is, the bus bar 55 b transmits the motor drive signal output from the circuit board 71 to the stator 34.

In the present specification, the bus bar is a wire extending mainly in a plane orthogonal to the axial direction.
Further, in the present specification, the wiring member is a wiring extending mainly in the axial direction.

  Furthermore, in the present specification, extending in a plane orthogonal to the axial direction does not include only extending in a plane exactly orthogonal to the axial direction, but with respect to a plane orthogonal to the axial direction Also includes the case of extending in the inclined direction in the range of less than 45 °.

  Further, in the present specification, “extending in the axial direction” does not include only the case of extending in the axial direction (Z-axis direction) strictly, but in a direction inclined by less than 45 ° with respect to the axial direction. It also includes the case of extension.

[Inverter housing]
The inverter housing 60 is provided between the lid 90 and the motor housing 20. The inverter housing 60 accommodates the cover 90 and a circuit board 71 described later. In the present embodiment, the inverter housing 60 is made of resin. As shown in FIG. 3, the inverter housing 60 includes an inverter housing main body 60 a and a connector 60 b.

  The inverter housing body 60 a has a frame shape having an inner peripheral portion 62. The inner circumferential portion 62 is concentric with the bearing bracket 40 and the bus bar member 50, and substantially overlaps in plan view (XY surface view). The inverter housing body 60a includes an inverter housing bottom 63a, an outer shell 63b, and a plurality of circuit board supporters 63c.

  The inverter housing bottom portion 63 a is provided in a frame shape around the inner peripheral portion 62. As shown in FIG. 1, a front side liquid gasket 64 b is provided on the front side (−Z side) surface of the inverter housing bottom 63 a along the entire circumference. The front side liquid gasket 64 b is in contact with the rear side (+ Z side) surface of the flange portion 23 of the motor housing 20.

  The outer shell 63b is provided on the outer edge of the inverter housing bottom 63a, as shown in FIG. The outer shell portion 63b protrudes from the inverter housing bottom portion 63a to the rear side (+ Z side). A rear side liquid gasket 64a is provided over the entire surface of the rear side of the outer shell 63b. As shown in FIG. 1, the rear side liquid gasket 64 a is in contact with an end surface on the front side (−Z side) of a hanging portion 92 of a lid portion 90 described later. The outer shell portion 63 b has a through hole 67 c into which an external thread 66 for fixing the motor housing 20 and the lid portion 90 is inserted. Although illustration is omitted, a plurality of through holes 67c are provided.

  The plurality of circuit board support portions 63c support a circuit board 71 described later. In other words, the inverter housing 60 supports the circuit board 71. The plurality of circuit board support portions 63c are provided to protrude rearward (+ Z side) from the inverter housing bottom 63a. The circuit board support portion 63 c is provided in the vicinity of the radially outer side of the inner circumferential portion 62.

  The plurality of circuit board support portions 63 c are provided apart from one another along the circumferential direction of the inner circumferential portion 62. As shown in FIG. 1, an internal thread portion 67b that opens to the rear side is provided inside the circuit board support portion 63c. The position of the rear end of the circuit board support portion 63c is located on the rear side of the rear end of the outer shell portion 63b.

  The connector portion 60 b protrudes radially outward from the outer shell portion 63 b of the inverter housing main portion 60 a. The connector portion 60 b has a power supply opening 61 opened radially outward. Although not shown, a connector for supplying power to the control device 70 protrudes from the bottom surface of the power supply opening 61. An external power supply (not shown) is connected to the connector portion 60b. The external power supply supplies power to the electric oil pump motor 10 via a connector provided on the bottom surface of the power supply opening 61.

[Control device]
The control device 70 controls the drive of the electric oil pump motor 10. The control device 70 is provided on the rear side (+ Z side) of the bearing bracket 40. The control device 70 includes a circuit board 71, a power IC 72, circuit components 73 a and 73 b, a sensor magnet holding member 80, and a sensor magnet 81. Further, as shown in FIG. 3, the control device 70 includes a rotation sensor 74a, a rotation sensor 74b, and a rotation sensor 74c.

  As shown in FIG. 2, the circuit board 71 is disposed on an extension on the rear side (+ Z side) of the shaft 31. The circuit board 71 has a main surface, for example, a front surface (−Z side) front surface 71 a orthogonal to the axial direction (Z-axis direction).

  As shown in FIG. 1, the circuit board 71 is supported by the end face on the rear side (+ Z side) of the plurality of circuit board support portions 63 c in the inverter housing 60. The circuit board 71 is fixed to the circuit board support portion 63 c by the male screw 67 a being tightened to the female screw portion 67 b of the circuit board support portion 63 c via the circuit board 71. Thus, the circuit board 71 is fixed to the inverter housing 60. Printed wiring not shown is provided on the main surface of the circuit board 71. The circuit board 71 outputs a motor drive signal.

  As shown in FIG. 2, in the present embodiment, a non-arrangement area AR <b> 1 is provided between the circuit board 71 and the shaft 31. The non-arrangement area AR1 is an area where components constituting the electric oil pump motor 10 excluding the circuit board 71 and the shaft 31, that is, circuit components 73a and 73b, rotation sensors 74a to 74c, and the like are not arranged. In other words, no component of the motor 10 for the electric oil pump is disposed between the circuit board 71 and the shaft 31, and the rear end (+ Z side) end face 31 a of the shaft 31 is the front side of the circuit board 71. It directly faces the front surface 71a (on the -Z side).

  The sensor magnet holding member 80 is provided at a portion protruding to the rear side (+ Z side) of the rear bearing holding portion 42 of the shaft 31. In the present embodiment, the sensor magnet holding member 80 is located on the radially inner side of the sensor holding portion 53 of the bus bar member 50.

  The sensor magnet holding member 80 is an annular member, and the center hole is positioned by being fitted to the small diameter portion of the end on the rear side (+ Z side) of the shaft 31. In other words, the inner peripheral surface of the sensor magnet holding member 80 is fitted to the rear end of the shaft 31. The sensor magnet holding member 80 is rotatable with the shaft 31. The sensor magnet holding member 80 is disposed on the rear side (+ Z side) of the rear bearing holding portion 42 in the bearing bracket 40. That is, the sensor magnet holding member 80 is disposed on the rear side of the rear bearing 39b.

  The sensor magnet 81 has an annular shape, and N poles and S poles are alternately arranged in the circumferential direction. The sensor magnet 81 is fitted on the outer peripheral surface of the sensor magnet holding member 80. As a result, the sensor magnet 81 is held by the sensor magnet holding member 80, and is disposed rotatably around the shaft 31 together with the shaft 31 on the rear side (+ Z side) of the rear bearing 39b.

The rotation sensors 74a to 74c are arranged in the vicinity of the sensor magnet 81 as shown in FIGS. The rotation sensors 74 a to 74 c detect the magnetic flux of the sensor magnet 81.
The configurations of the rotation sensors 74a to 74c are the same except for the positions where they are arranged. Therefore, in the following description, only the rotation sensor 74a may be described as a representative.

  Note that, in the present specification, that the rotation sensor is disposed in the vicinity of the sensor magnet includes that the rotation sensor is disposed in a range where the change in the magnetic flux of the sensor magnet can be suitably detected.

  As shown in FIG. 3, the rotation sensor 74 a is positioned by a sensor positioning portion 54 a in the bus bar member 50. In the present embodiment, the rotation sensor 74a is fitted in the sensor positioning recess 57a of the sensor positioning portion 54a. Similarly, the rotation sensor 74b is fitted in the sensor positioning recess 57b of the sensor positioning portion 54b. Similarly, the rotation sensor 74c is fitted in the sensor positioning recess 57c of the sensor positioning portion 54c. Accordingly, the rotation sensors 74 a to 74 c are provided on the outer side in the radial direction of the sensor magnet 81 so as to face the sensor magnet 81 in the radial direction.

  A terminal 75 a of the rotation sensor 74 a extends to the rear side (+ Z side) and is connected to the circuit board 71. A terminal 75 b of the rotation sensor 74 b extends to the rear side (+ Z side) and is connected to the circuit board 71. A terminal 75 c of the rotation sensor 74 c extends to the rear side (+ Z side) and is connected to the circuit board 71. For example, three terminals 75a to 75c are provided. Thus, the rotation sensors 74a to 74c are attached to the circuit board 71, respectively.

  As shown in FIG. 1, the power IC 72 is fixed to the rear side (+ Z side) surface of the circuit board 71. The power IC 72 constitutes an inverter circuit, and controls the power supplied to the electric oil pump motor 10 via the connector portion 60b.

  The circuit components 73 a and 73 b are components attached to the circuit board 71. The circuit components 73a and 73b are components that constitute an inverter circuit together with the power IC 72, and are, for example, capacitors and transistors. The circuit components 73a and 73b are fixed to the front surface 71a of the circuit board 71, as shown in FIG. The circuit components 73a and 73b are disposed outside the rotation sensors 74a to 74c in the radial direction.

  The circuit components 73 a and 73 b protrude from the front surface 71 a of the circuit board 71 to the front side (−Z side). Part of the front side of the circuit components 73 a and 73 b is located on the outside in the radial direction of the sensor magnet 81.

[Cover]
The lid 90 is provided on the rear side (+ Z side) of the inverter housing 60. The lid 90 covers the circuit board 71. The lid portion 90 includes a top plate portion 91 and a hanging portion 92.
A heat conduction sheet 65 is provided on the front surface 91 a on the front side (−Z side) of the top plate portion 91. The heat transfer sheet 65 is in contact with the power IC 72.

  The hanging portion 92 extends from the outer edge of the top plate portion 91 to the front side (−Z side). The front end surface of the drooping portion 92 is in contact with the rear side (+ Z side) surface of the flange portion 23 of the motor housing 20. The hanging portion 92 is provided with a female screw portion 92a that opens to the front side. In the present embodiment, the circuit board 71 is located radially inward of the hanging portion 92.

  The lid 90 has a plurality of male screws 66 inserted into the through holes 23a of the flange 23 and tightened with the female threads 92a through the through holes 67c of the outer shell 63b. It is fixed. Accordingly, the inverter housing 60 is fixed between the hanging portion 92 of the lid portion 90 and the flange portion 23 of the motor housing 20.

  In the electric oil pump motor 10 of the present embodiment, power is supplied to the control device 70 from an external power source connected via the connector portion 60b. Accordingly, a drive current is supplied from the control device 70 to the coil portion 37 of the stator 34 through the circuit board wiring member 55a, the bus bar 55b, and the stator wiring member 55c. When a drive current is supplied to the coil unit 37, a magnetic field is generated, and the rotor 30 having the shaft 31 is rotated by this magnetic field. Thus, the motor 10 for an electric oil pump obtains rotational driving force.

  The drive current supplied to the coil portion 37 of the stator 34 is controlled by the inverter circuit configured by the power IC 72 and the circuit components 73 a and 73 b in the control device 70. Specifically, the control device 70 detects the rotational position of the rotor 30 by detecting the change of the magnetic flux of the sensor magnet 81 by the rotation sensors 74a to 74c. The inverter circuit of the control device 70 outputs a motor drive signal according to the rotational position of the rotor 30, and controls the drive current supplied to the coil portion 37 of the stator 34. Thus, the drive of the motor 10 for an electric oil pump of the present embodiment is controlled.

  According to the present embodiment, the annular recess 45 is provided on the radially outer side of the rear bearing holding portion 42 that holds the rear bearing 39 b. Therefore, for example, as shown in FIG. 1, at least a part of the bus bar member 50 can be disposed inside the annular recess 45. Further, for example, part of the front side of the circuit components 73 a and 73 b fixed to the front surface 71 a of the circuit board 71 can be accommodated in the annular recess 45. In other words, the radially outer area of the rear bearing 39b can be used as an arrangement area for the bus bar member 50 and the circuit components 73a and 73b. Thus, the distance H1 between the circuit board 71 and the shaft 31 shown in FIG. 2 can be reduced. Therefore, according to the present embodiment, it is possible to obtain the electric oil pump motor including the circuit board 71 and the rotation sensors 74 a to 74 c and the structure capable of suppressing enlargement in the axial direction.

  Thereby, when the electric oil pump mounted with the motor 10 for an electric oil pump of the present embodiment is attached to, for example, an engine room of a vehicle, it can be suppressed that the installation position of the electric oil pump is restricted. As a result, it is possible to suppress an increase in the distance for routing the oil pipe connected to the electric oil pump. Therefore, according to this embodiment, it can suppress that the installation area | region of the oil pipe connected to an electric oil pump and an electric oil pump becomes large in the limited space in the engine room of a vehicle.

  Further, according to the present embodiment, since the motor-driven oil pump motor 10 can be prevented from increasing in size in the axial direction as described above, the weight of the motor-driven oil pump motor 10 can be suppressed from increasing.

  Further, according to the present embodiment, a part of the front side of the circuit components 73 a and 73 b is located on the radially outer side of the sensor magnet 81. That is, according to the present embodiment, part of the circuit components 73a and 73b and the sensor magnet 81 can be arranged so as to overlap in the axial direction. Therefore, according to the present embodiment, it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump.

  Further, according to the present embodiment, a part of the bus bar member 50, that is, the sensor holding portion 53 and the sensor positioning portions 54 a to 54 c are located on the radially outer side of the sensor magnet 81. Thereby, the area | region outside the radial direction of the sensor magnet 81 can be utilized as an area | region which arrange | positions the bus-bar member 50. FIG. Therefore, according to the present embodiment, it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump.

  For example, in order to reduce the axial dimension of the motor 10 for an electric oil pump, the shaft 31 may be shortened and the axial distance between the front bearing 39a and the rear bearing 39b may be reduced. However, in this case, when the front bearing 39a and the rear bearing 39b shift in the radial direction, the amount of shift is relatively larger than the axial distance between the front bearing 39a and the rear bearing 39b. . Therefore, the inclination of the shaft 31 becomes large, and there is a problem that the shaft 31 is easily loaded. Therefore, in order to reduce the axial distance between the rear bearing 39b and the front bearing 39a, it is necessary to further improve the accuracy of the coaxiality between the rear bearing 39b and the front bearing 39a.

  On the other hand, according to the present embodiment, since the bearing bracket 40 is press-fit into the cylindrical portion 21 of the motor housing 20, the bearing bracket 40 can be firmly fixed to the inside of the cylindrical portion 21 of the motor housing 20. Thereby, the position of the rear bearing 39b held by the rear bearing holding portion 42 of the bearing bracket 40 can be firmly fixed, and the rear bearing 39b can be prevented from rattling in the radial direction. Further, the coaxiality between the rear bearing 39b and the front bearing 39a can be improved.

  Therefore, according to this embodiment, even when the axial distance between the rear bearing 39b and the front bearing 39a is reduced, it is possible to suppress the load on the shaft 31, and the shaft of the electric oil pump motor 10 can be suppressed. The dimension of the direction can be reduced. Moreover, thereby, the motor 10 for electrically driven oil pumps can be reduced in size, and can be reduced in weight. Moreover, since the load concerning rotation of the shaft 31 can be reduced, the energy efficiency of the electric oil pump motor 10 can be improved.

  Moreover, according to this embodiment, since the bearing bracket 40 is formed by press-molding a steel plate, the strength is high. Therefore, the bearing bracket 40 can be fixed more firmly in the motor housing 20.

  Further, according to the present embodiment, since the motor housing 20 is also formed of a steel plate in the same manner as the bearing bracket 40, the bearing bracket 40 can be fixed easily and firmly in the motor housing 20.

  Further, according to the present embodiment, the bus bar member 50 includes the sensor positioning portions 54 a to 54 c, and the inner diameter portion 51 of the bus bar member 50 is fitted to the rear bearing holding portion 42. Therefore, according to the present embodiment, the rotation sensors 74a to 74c are simply mounted on the sensor positioning portions 54a to 54c of the bus bar member 50 fitted to the rear bearing holding portion 42, and the rotation sensors 74a to 74c are connected to the shaft. It can arrange | position accurately at the position which becomes equidistant from the central axis J of 31.

  According to the present embodiment, the rotation sensor 74a is fitted into the sensor positioning recess 57a of the sensor positioning portion 54a. Therefore, the position of the rotation sensor 74a is stably fixed, and the change of the magnetic flux of the sensor magnet 81, that is, the rotation of the rotor 30 can be stably detected. Moreover, it can also suppress that the detection accuracy of rotation of the rotor 30 falls by the vibration of the motor 10 for electric oil pumps, etc. The same applies to the rotation sensors 74b and 74c.

  Further, according to the present embodiment, the bus bar member 50 includes the cap portion 52, and the cap portion 52 covers a part of the rear end surface of the rear bearing holding portion 42 in the bearing bracket 40. Therefore, the rear side position of the bus bar member 50 in the axial direction is regulated by the cap portion 52, and the axial position of the bus bar member 50 with respect to the bearing bracket 40 can be determined with high accuracy. Therefore, according to the present embodiment, the axial position of the bus bar member 50 with respect to the rear bearing 39 b can be determined with high accuracy.

  Further, according to the present embodiment, the bus bar member 50 includes the sensor holding portion 53 extending from the radially inner side to the rear side of the cap portion 52, and the sensor positioning portions 54a to 54c are provided in the sensor holding portion 53. . Therefore, according to the present embodiment, the rotation sensors 74a to 74c can be placed close to the sensor magnet 81 with high accuracy.

  Further, according to the present embodiment, since the rotation sensors 74a to 74c are provided radially outward of the sensor magnet 81, the rotation sensors 74a to 74c are arranged in line with the sensor magnet 81 in the axial direction. In comparison, the axial dimension of the electric oil pump motor 10 can be reduced.

  Also, for example, the bearing bracket 40 includes a flange portion extending radially outward from the rear end of the peripheral portion 43, and the flange portion and the flange portion 23 of the motor housing 20 are axially overlapped and connected The axial dimension of the motor 10 for the electric oil pump is increased by the amount of the flange portion of the bearing bracket 40.

  On the other hand, according to the present embodiment, the entire bearing bracket 40 is located radially inward of the flange portion 23, and there is no portion of the bearing bracket 40 superimposed in the axial direction with respect to the flange portion 23. Therefore, it can suppress that the dimension of the axial direction of the motor 10 for electrically driven oil pumps becomes large.

  Further, according to the present embodiment, the rear end of the peripheral edge 43 of the bearing bracket 40 is provided on the front side of the rear end of the cylindrical portion 21 of the motor housing 20 in the axial direction. It is done. Therefore, the relative position of the entire bearing bracket 40 in the axial direction to the motor housing 20 can be made more front side. Therefore, according to the present embodiment, it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump.

  Also, for example, when fixing the bearing bracket 40 and the bus bar member 50 using a male screw, the entire axial direction of the bearing bracket 40 and the bus bar member 50 combined by the thickness of the head portion of the male screw The dimensions get bigger. In addition, a portion in which an external thread such as a female screw portion or a nut is tightened is necessary, and the axial dimension of the entire bearing bracket 40 and the bus bar member 50 is increased by that amount. As a result, there is a problem that the axial dimension of the motor 10 for an electric oil pump tends to be large.

  On the other hand, according to the present embodiment, the bearing bracket 40 includes the pressing portions 44 a and 44 b, and the pressing portions 44 a and 44 b come into contact with the rear side surface of the bus bar member 50. The bus bar member 50 is fixed to the bracket 40. Therefore, according to the present embodiment, it is not necessary to use a male screw to fix the bearing bracket 40 and the bus bar member 50, and it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump.

  Further, according to the present embodiment, the non-arrangement area AR1 is provided between the circuit board 71 and the shaft 31, and the rear end face 31a of the shaft 31 directly faces the front surface 71a of the circuit board 71. There is. Therefore, it is easy to reduce the distance H1 between the circuit board 71 and the shaft 31. Therefore, according to the present embodiment, it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump.

  Moreover, according to the present embodiment, since the main surface of the circuit board 71 is disposed orthogonal to the axial direction, it is possible to suppress an increase in the axial dimension of the motor 10 for an electric oil pump. Further, the rotation sensors 74a to 74c and the circuit components 73a and 73b attached to the circuit board 71 can be easily arranged with high accuracy.

Moreover, according to this embodiment, since the rear side liquid gasket 64a is provided, it can suppress that water and oil penetrate | invade into the inside of the motor 10 for electric oil pumps from the clearance gap between the inverter housing 60 and the cover part 90. it can.
Moreover, according to this embodiment, since the front side liquid gasket 64b is provided, water and oil are prevented from entering the inside of the electric oil pump motor 10 through the gap between the inverter housing 60 and the motor housing 20. it can.

  Further, according to the present embodiment, the heat conductive sheet 65 is provided on the front surface 91 a of the top plate 91 in the lid 90, and the heat conductive sheet 65 is in contact with the power IC 72. Thereby, the heat generated by the power IC 72 and the circuit board 71 can be radiated to the lid 90 via the heat conductive sheet 65. Therefore, according to the present embodiment, it can be suppressed that the power IC 72 and the circuit board 71 become high heat and are damaged.

  In the present embodiment, the following configuration may be employed.

  In the above description, the main surface of the circuit board 71, for example, the front surface 71a is configured to be orthogonal to the axial direction, but is not limited thereto. In the present embodiment, the main surface of the circuit board 71 may cross the axial direction, and the main surface of the circuit board 71 may be inclined with respect to the axial direction.

  Further, in the present embodiment, the whole of the circuit components 73 a and 73 b attached to the circuit board 71 may be located outside the sensor magnet 81 in the radial direction. That is, in the present embodiment, it is possible to employ a configuration in which at least a part of the circuit components 73 a and 73 b are located on the radially outer side of the sensor magnet 81. When the entire circuit components 73a and 73b are located outside the sensor magnet 81 in the radial direction, for example, the circuit components 73a and 73b are connected to the circuit board 71 by connection wiring.

  In the embodiment, the rear end of the bearing bracket 40 may be at the same position as the rear end of the cylindrical portion 21 of the motor housing 20 in the axial direction. That is, in the present embodiment, in the axial direction, the rear end of the bearing bracket 40 is at the same position as the rear end of the cylindrical portion 21 of the motor housing 20, or the rear end of the cylindrical portion 21. It is possible to adopt a configuration provided on the front side of the unit.

  Moreover, in the said description, although the peripheral part 43 of the bearing bracket 40 was set as the structure extended to the rear side from the outer periphery of the annular part 41, it is not restricted to this. In the present embodiment, for example, the tip of the portion extending from the outer peripheral edge of the annular portion 41 to the rear side is bent radially outward, and the portion extending from the radially outer end of the bent portion to the front side May be used as the peripheral portion.

  In the above description, the bus bar member 50 and the inverter housing 60 are separate members, but are not limited thereto. In the present embodiment, the bus bar member 50 and the inverter housing 60 may be integrally connected.

Moreover, in this embodiment, the number of the pressing parts of the bearing bracket 40 is not specifically limited, One may be sufficient and three or more may be sufficient.
In the present embodiment, the pressing portions 44a and 44b of the bearing bracket 40 may not be provided.

In the present embodiment, the heat conduction sheet 65 may not be provided.
In the present embodiment, one or both of the rear side liquid gasket 64a and the front side liquid gasket 64b may not be provided.
Further, in the present embodiment, the number of circuit components is not limited to two, and may be one or three or more.

Second Embodiment
The second embodiment is different from the first embodiment in the shape of the bus bar member.
In the following description, about the same composition as the above-mentioned embodiment, explanation may be omitted by attaching the same numerals suitably.

FIG. 4 is a cross-sectional view showing the electric oil pump motor 110 of the present embodiment.
As shown in FIG. 4, the electric oil pump motor 110 includes a motor housing 20, a bearing bracket 40, a shaft 31, a rotor 30, a stator 34, a front bearing 39 a, a rear bearing 39 b, and a bus bar member 150. An inverter housing 60, a control device 170, and a lid 90.

  The bus bar member 150 includes an inner diameter portion 151, a sensor positioning portion 154a, a sensor positioning portion 154b, a bus bar holding portion 56, a circuit board wiring member 55a, a bus bar 55b, and a stator wiring member 55c.

  Similar to the bus bar member 50 of the first embodiment, the bus bar member 150 includes three sensor positioning portions. That is, although illustration is omitted, the bus bar member 150 includes another sensor positioning portion in addition to the sensor positioning portions 154a and 154b.

  The inner diameter portion 151 protrudes to the rear side (+ Z side) from the end surface 42 c of the rear bearing holding portion 42. A sensor positioning portion 154a, a sensor positioning portion 154b, and another sensor positioning portion (not shown) are provided at the rear end of the inner diameter portion 151. The three sensor positioning parts are arranged at equal intervals in the circumferential direction of the inner diameter part 151.

The sensor positioning portion 154a has a sensor positioning recess 157a on the radially inner side. The sensor positioning portion 154b has a sensor positioning recess 157b on the radially inner side. The sensor positioning recesses 157a and 157b have the same configuration as the sensor positioning recesses 57a and 57b of the first embodiment. Another sensor positioning unit (not shown) has the same configuration as the sensor positioning units 154a and 154b.
The inner diameter portion 151 of the present embodiment is the same as the inner diameter portion 51 of the first embodiment except for the above points.

The control device 170 includes a circuit board 171, a power IC 72, circuit components 73a and 73b, a rotation sensor 74a, a rotation sensor 74b, a rotation sensor 74c, a sensor magnet holding member 180, and a sensor magnet 81. . In FIG. 4, the rotation sensor 74 c is not shown.
The circuit board 171 is the same as the circuit board 71 of the first embodiment except that the portions to which the terminals 75a to 75c of the rotation sensors 74a to 74c are connected are different.

  The sensor magnet holding member 180 is different from the sensor magnet holding member 80 of the first embodiment in that the diameter of the outer periphery is large. Therefore, the radial position of the sensor magnet 81 held by the sensor magnet holding member 180 is outside as compared with the first embodiment.

  Thus, the sensor magnet 81 can be disposed closer to the rotation sensors 74a to 74c held by the sensor positioning units 154a to 154c provided in the inner diameter portion 151.

  According to the present embodiment, since the bus bar member 150 does not include the cap portion 52 and the sensor holding portion 53, the axial dimension of the bus bar member 150 can be reduced accordingly. Thus, according to the present embodiment, it is possible to suppress an increase in the axial dimension of the motor 110 for an electric oil pump.

Third Embodiment
The third embodiment is different in that the rotation sensor is directly fixed to the circuit board.
In the following description, about the same composition as the above-mentioned embodiment, explanation may be omitted by attaching the same numerals suitably.

FIG. 5 is a cross-sectional view showing the electric oil pump motor 210 of the present embodiment.
As shown in FIG. 5, the electric oil pump motor 210 includes a motor housing 20, a bearing bracket 40, a shaft 31, a rotor 30, a stator 34, a front bearing 39 a, a rear bearing 39 b, and a bus bar member 250. , An inverter housing 60, a control device 270, and a lid 90.

  The bus bar member 250 includes an inner diameter portion 51, a bus bar holding portion 56, a circuit board wiring member 55a, a bus bar 55b, and a stator wiring member 55c. That is, the bus bar member 250 is different from the bus bar member 50 of the first embodiment in that the cap portion 52, the sensor holding portion 53, and the sensor positioning portions 54a to 54c are not provided. In the present embodiment, the entire bus bar member 250 is located on the front side (−Z side) of the end surface 42 c of the rear bearing holding portion 42 of the bearing bracket 40.

The control device 270 includes a circuit board 271, a power IC 72, circuit components 73 a and 73 b, a rotation sensor 274 a, a rotation sensor 274 b, a sensor magnet holding member 80, and a sensor magnet 81. The control device 270 includes three rotation sensors, as in the control device 70 of the first embodiment. That is, although not shown, control device 270 includes another rotation sensor in addition to rotation sensors 274a and 274b.
The circuit board 271 is the same as the circuit board 71 of the first embodiment except that the rotation sensors 274a and 274b are directly fixed.

The rotation sensors 274 a and 274 b are fixed to the front surface 271 a on the front side (−Z side) of the circuit board 271. The rotation sensors 274a and 274b are provided between the circuit board 271 and the sensor magnet 81 so as to face each other in the axial direction (Z-axis direction). The same applies to another rotation sensor (not shown).
The circuit components 73a and 73b are disposed on the radially outer side of the rotation sensors 274a and 274b and another rotation sensor (not shown).

  According to the present embodiment, the rotation sensors 274a and 274b having relatively small axial dimensions are directly fixed to the circuit board 271, and the circuit components 73a and 73b are disposed radially outward of the rotation sensors 274a and 274b. Therefore, the axial distance H1 (see FIG. 2) between the circuit board 271 and the shaft 31 can be easily reduced, and an increase in the axial dimension of the electric oil pump motor 210 can be suppressed.

  In addition, according to the present embodiment, the bus bar member 250 does not include the cap portion 52, the sensor holding portion 53, and the sensor positioning portions 54a to 54c. it can. Therefore, the circuit components 73 a and 73 b attached to the circuit board 271 and other components can be disposed in the area outside the sensor magnet 81 in the radial direction. Therefore, according to the present embodiment, an increase in the axial dimension of the electric oil pump motor 210 can be suppressed.

  In the present embodiment, the following configuration can also be adopted.

  In the present embodiment, the rotation sensors 274 a and 274 b are fixed at positions outside the sensor magnet 81 in the radial direction of the circuit board 271, and the circuit board 271 is disposed close to the shaft 31. , 274 b may be disposed radially outside the sensor magnet 81.

  Further, in the present embodiment, the entire bus bar member 250 may be accommodated inside the annular recess 45.

Fourth Embodiment
The fourth embodiment differs in that the support position of the circuit board by the inverter housing is on the front side with respect to the contact position between the inverter housing and the lid.
In the following description, about the same composition as the above-mentioned embodiment, explanation may be omitted by attaching the same numerals suitably.

FIG. 6 is a cross-sectional view showing the motor 310 for an electric oil pump of the present embodiment.
As shown in FIG. 6, the electric oil pump motor 310 includes a motor housing 20, a bearing bracket 40, a shaft 331, a rotor 330 including the shaft 331, a stator 34, a front bearing 39a, and a rear bearing 39b. , A bus bar member 350, an inverter housing 360, a control device 370, and a lid 390.

  The rotor 330 is the same except that the length in the axial direction (Z-axis direction) of the shaft 331 is shorter than the length in the axial direction of the shaft 31 of the first embodiment. Specifically, the shaft 331 has a slightly shorter protruding length of the portion of the bearing bracket 40 protruding to the rear side (+ Z side) of the rear bearing holding portion 42 than the shaft 31 of the first embodiment.

  The bus bar member 350 includes an inner diameter portion 51, a cap portion 352, a sensor positioning portion 354a, a sensor positioning portion 354b, a bus bar holding portion 56, a circuit board wiring member 55a, a bus bar 55b, and a stator wiring member 55c. And.

  Similar to the bus bar member 50 of the first embodiment, the bus bar member 350 includes three sensor positioning portions. That is, although illustration is omitted, the bus bar member 350 includes another sensor positioning unit in addition to the sensor positioning units 354a and 354b.

  The cap portion 352 is different from the cap portion 52 of the first embodiment in that sensor positioning portions 354a and 354b and another sensor positioning portion (not shown) are provided at radial inner end portions. The three sensor positioning portions are disposed at equal intervals in the circumferential direction on the inner side in the radial direction of the cap portion 352.

The sensor positioning portion 354a has a sensor positioning recess 357a on the inner side in the radial direction. The sensor positioning portion 354b has a sensor positioning recess 357b on the inner side in the radial direction. The sensor positioning recesses 357a and 357b have the same configuration as the sensor positioning recesses 57a and 57b of the first embodiment. Another sensor positioning unit (not shown) has the same configuration as the sensor positioning units 354a and 354b.
The cap part 352 of this embodiment is the same as the cap part 52 of 1st Embodiment about points other than said point.

The inverter housing 360 includes an inverter housing main portion 360 a and a connector portion 60 b.
The inverter housing main body 360 a has a frame shape having an inner peripheral portion 362. The inner peripheral part 362 is the same as the inner peripheral part 62 of the first embodiment.

The inverter housing main body portion 360a includes an inverter housing bottom portion 63a, an outer shell portion 363b, and a plurality of circuit board support portions 363c.
The outer shell portion 363 b is the same as the outer shell portion 63 b of the first embodiment.

  The plurality of circuit board support portions 363c are first in that the position of the rear end (+ Z side) is closer to the front side (−Z side) than the position of the rear end of the outer shell 363b. It differs from the circuit board support portion 63c of the embodiment. That is, when the position in the axial direction (Z-axis direction) of the flange portion 23 of the motor housing 20 is used as a reference, the height H3 of the circuit board support portion 363c is smaller than the height H2 of the outer shell portion 363b.

  The control device 370 includes a circuit board 371, a power IC 72, a circuit component 373, a rotation sensor 74a, a rotation sensor 74b, a rotation sensor 74c, a sensor magnet holding member 380, and a sensor magnet 381. In FIG. 6, the rotation sensor 74c is not shown.

  Similarly to the circuit board 71 of the first embodiment, the circuit board 371 is supported by being fixed to the plurality of circuit board support portions 363c with male screws 67a. In the present embodiment, since the height H3 of the circuit board support portion 363c is smaller than the height H2 of the outer shell portion 363b, the position where the circuit board 371 of the inverter housing 360 is supported is the rear side of the outer shell portion 363b. From the end of (+ Z side) is the front side (−Z side). That is, the circuit board 371 is disposed inside the outer shell portion 363b.

The circuit board 371 is different from the circuit board 71 of the first embodiment in that the circuit component 373 and the rotation sensors 74a to 74c are connected.
The circuit board 371 of the present embodiment is the same as the circuit board 71 of the first embodiment except for the above points.

  The sensor magnet holding member 380 is attached to the end on the rear side (+ Z side) of the shaft 331. The sensor magnet holding member 380 is generally smaller in size than the sensor magnet 81 of the first embodiment. This is because the portion of the shaft 331 protruding from the rear bearing holding portion 42 to the rear side (+ Z side) is shorter than the shaft 31 of the first embodiment.

Similarly, the sensor magnet 381 is generally smaller in size than the sensor magnet 381 of the first embodiment.
The sensor magnet holding member 380 and the sensor magnet 381 of the present embodiment are the same as the sensor magnet holding member 80 and the sensor magnet 81 of the first embodiment except for the points described above.

The circuit component 373 is fixed to the front surface 371 a on the front side (−Z side) of the circuit board 371. The front side (−Z side) end of the circuit component 373 is located inside the local concave portion 56 a of the bus bar holding portion 56 in the bus bar member 350 and inside the annular concave portion 45 of the bearing bracket 40.
The circuit component 373 of the present embodiment is the same as the circuit component 73a of the first embodiment except for the points described above.

  The lid part 390 is different from the lid part 90 of the first embodiment in that the lid part 390 has a substantially flat plate shape without a hanging part. That is, in the present embodiment, the entire cover 390 corresponds to the top plate 91 in the first embodiment. The lid portion 390 is fixed to the motor housing 20 via the inverter housing 360 with a plurality of male screws 66 in the same manner as the lid portion 90 of the first embodiment.

  The outer edge portion of the front surface 390 a on the front side (−Z side) of the lid portion 390 is in contact with the end surface on the rear side (+ Z side) of the outer shell portion 363 b of the inverter housing 360. The position where the front surface 390 a of the lid 390 contacts the inverter housing 360 is on the rear side with respect to the circuit board 371. In other words, the position at which the circuit board 371 of the inverter housing 360 is supported is on the front side (−Z side) than the position at which the inverter housing 360 and the lid 390 are in contact.

  According to the present embodiment, since the front end of the circuit component 373 is located inside the local recess 56 a of the bus bar member 350, the circuit board 371 can be disposed close to the shaft 331. Therefore, according to this embodiment, it is possible to suppress an increase in the axial dimension of the motor 310 for an electric oil pump.

  Further, according to the present embodiment, since the front end of the circuit component 373 is located inside the annular recess 45 of the bus bar member 350, the circuit board 371 can be disposed close to the shaft 331. it can. Therefore, according to this embodiment, it is possible to suppress an increase in the axial dimension of the motor 310 for an electric oil pump.

  Further, according to the present embodiment, since the height H3 of the circuit board support portion 363c is smaller than the height H2 of the outer shell portion 363b, the lid portion 390 is supported by the inverter housing 360 and the position at which the circuit board 371 is supported. It is on the front side of the contact position. Therefore, even if the lid 390 does not include a hanging portion, the lid 390 does not come into contact with the circuit board 371. Therefore, as shown in the present embodiment, the dimension in the axial direction of the lid portion 390 can be made smaller than in the case where the hanging portion is provided, and the dimension in the axial direction of the motor 310 for an electric oil pump can be made smaller.

  In addition, according to the present embodiment, the circuit board 371 is disposed closer to the shaft 331 because the position where the circuit board 371 is supported is on the front side than the rear end of the outer shell 363b. Therefore, according to this embodiment, it is possible to suppress an increase in the axial dimension of the motor 310 for an electric oil pump.

  In the present embodiment, the following configuration may be employed.

  In the present embodiment, the entire circuit component 373 may be positioned inside the local recess 56 a of the bus bar holding portion 56. That is, in the present embodiment, a configuration in which at least a part of the circuit component 373 is located inside the local recess 56 a of the bus bar holding portion 56 can be adopted.

  Further, in the present embodiment, the entire circuit component 373 may be positioned inside the annular recess 45. That is, in the present embodiment, a configuration in which at least a part of the circuit component 373 is positioned inside the annular recess 45 can be adopted.

  In the above description, unlike the first to third embodiments, only one circuit component 373 is provided. However, the present invention is not limited to this. In the present embodiment, two or more circuit components may be provided.

  The configurations of the first to fourth embodiments described above can be combined as appropriate within a range that does not interfere with each other.

  DESCRIPTION OF SYMBOLS 10, 110, 210, 310 ... Motor for electric oil pumps, 20 ... Motor housing, 21 ... Cylindrical part, 21a ... Inner peripheral surface, 23 ... Flange part, 24 ... Bottom part, 30, 330 ... Rotor, 34 ... Stator, 40 ... bearing bracket, 41 ... annular part, 43 ... peripheral part, 44a, 44b ... pressing part (contact part), 45 ... annular recessed part, 50, 150, 250, 350 ... bus bar member, 51, 151 ... inner diameter part , 52, 352 ... cap portion, 53 ... sensor holding portion, 54a, 54b, 54c, 154a, 154b, 354a, 354b ... sensor positioning portion, 56a ... local recess, 71, 171, 271, 371 ... circuit board, 73a, 73b, 373: Circuit parts, 74a, 74b, 74c, 274a, 274b: Rotation sensors, 81, 381: Sensor magnets, 90, 3 DESCRIPTION OF SYMBOLS 0 ... Lid part, 22 ... Front bearing holding part (1st protrusion part) 31, 31. Shaft (rotational axis), 39a ... Front bearing (1st bearing member), 39b ... Rear bearing (2nd bearing member), 42 Rear bearing holding portion (second projection) 55b Bus bar 60 Inverter housing (supporting member)

Claims (15)

A rotor supported on an axially extending rotary shaft;
A stator located radially outside the rotor;
A first bearing member disposed on one side of the rotor in the axial direction and supporting the rotation shaft;
A second bearing member disposed on the other axial side of the rotor and supporting the rotation shaft;
A motor housing that houses the rotor, the stator, and the first bearing member;
A bearing bracket that holds the second bearing member and is fitted to the motor housing;
A circuit board disposed on an extension of the other side of the rotation axis, the main surface intersecting the axial direction;
A bus bar member that includes a bus bar that transmits a motor drive signal output from the circuit board to the stator, and is disposed outside the second bearing member in the radial direction of the rotary shaft;
A sensor magnet rotatably disposed on the other side of the second bearing member around the rotation axis along with the rotation axis;
A rotation sensor attached to the circuit board and disposed near the sensor magnet for detecting the magnetic flux of the sensor magnet;
Equipped with
The motor housing is
A cylindrical portion having a bottom portion provided on the one side and opening on the other side;
A first protrusion which protrudes from the center of the bottom to the one side and the other side opens to the inside of the cylindrical portion;
Equipped with
The stator is held inside the cylindrical portion,
The first bearing member is held inside the first protrusion,
The bearing bracket is
An annulus,
A second projection which protrudes from the center of the annular portion toward the other side and which is open on the surface on one side of the annular portion;
A peripheral portion extending from the outer peripheral edge of the annular portion to the other side;
Equipped with
The second bearing member is held on the radially inner side of the second projection,
The peripheral portion is fitted to an inner peripheral surface of the cylindrical portion in the motor housing,
The bearing bracket is provided with an annular recess located on the radially outer side of the second bearing member and surrounded by the annular portion, the second protrusion, and the peripheral portion.
The bus bar member is disposed in the annular recess.
The bus bar member is substantially annular,
The bus bar member includes an inner diameter portion that is fitted to the second protrusion portion from the radially outer side, a sensor positioning portion that is provided on the other side of the inner diameter portion and positions the rotation sensor,
With
The motor for an electric oil pump, wherein at least a part of the circuit components attached to the circuit board is located on the radially outer side of the sensor magnet. A rotor supported on an axially extending rotary shaft;
A stator located radially outside the rotor;
A first bearing member disposed on one side of the rotor in the axial direction and supporting the rotation shaft;
A second bearing member disposed on the other axial side of the rotor and supporting the rotation shaft;
A motor housing for housing the rotor, the stator, and the first bearing member;
A bearing bracket that holds the second bearing member and is fitted to the motor housing;
A circuit board disposed on an extension of the other side of the rotation axis, the main surface intersecting the axial direction;
A bus bar member that includes a bus bar that transmits a motor drive signal output from the circuit board to the stator, and is disposed outside the second bearing member in the radial direction of the rotary shaft;
A sensor magnet rotatably disposed on the other side of the second bearing member around the rotation axis along with the rotation axis;
A rotation sensor that is attached to the circuit board and disposed in the vicinity of the sensor magnet, and detects a magnetic flux of the sensor magnet;
Equipped with
The motor housing is
A cylindrical portion having a bottom portion provided on the one side and opening on the other side;
A first protrusion which protrudes from the center of the bottom to the one side and the other side opens to the inside of the cylindrical portion;
Equipped with
The stator is held inside the cylindrical portion,
The first bearing member is held inside the first protrusion,
The bearing bracket is
An annulus,
A second projection which protrudes from the center of the annular portion toward the other side and which is open on the surface on one side of the annular portion;
A peripheral portion extending from the outer peripheral edge of the annular portion to the other side;
Equipped with
The second bearing member is held on the radially inner side of the second projection,
The peripheral portion is fitted to an inner peripheral surface of the cylindrical portion in the motor housing,
The bearing bracket is provided with an annular recess located on the radially outer side of the second bearing member and surrounded by the annular portion, the second protrusion, and the peripheral portion.
The bus bar member is disposed in the annular recess.
The bus bar member is substantially annular,
The bus bar member includes an inner diameter portion fitted to the second projection from the radial direction outer side, and a sensor positioning portion provided on the other side of the inner diameter portion to position the rotation sensor. Electric oil pump motor. The bus bar member includes a cap portion extending radially inward from the other end of the inner diameter portion,
It said cap portion, said second cover at least a part of an end face of the other side of the protrusion, the motor electric oil pump according to claim 1 or 2. The bus bar member includes a sensor holding portion extending from the radially inner end of the cap portion to the other side.
The motor according to claim 3 , wherein the sensor positioning unit is provided in the sensor holding unit.   2. The electric oil pump motor according to claim 1, wherein a part of the bus bar member is located on the radially outer side of the sensor magnet. The rotation sensor is fixed to the one surface of the circuit board,
The circuit components constitute the inverter circuit, wherein disposed on the radially outer side of the rotation sensor, a motor for an electric oil pump according to claim 1 or 5.   The electric oil pump motor according to claim 1, wherein the rotation sensor is provided outside the sensor magnet in the radial direction. The motor for an electric oil pump according to any one of claims 1 to 7 , wherein the bearing bracket is formed by press-molding a steel plate. The motor housing includes a flange portion extending radially outward from the other end of the cylindrical portion,
The motor for an electric oil pump according to any one of claims 1 to 8 , wherein the entire bearing bracket is located on the radially inner side of the flange portion. In the axial direction, the end portion on the other side of the peripheral edge portion is at the same position as the end portion on the other side of the cylindrical portion, or on the one side position from the end portion on the other side of the cylindrical portion. The motor for an electric oil pump according to any one of claims 1 to 9 , which is provided. The bearing bracket includes a plurality of contact portions projecting inward in the radial direction from the other end portion of the peripheral edge portion,
The electric oil pump according to any one of claims 1 to 10 , wherein the plurality of contact portions are provided separately from each other in the circumferential direction of the peripheral edge portion and contact the other surface of the bus bar member. Motor. The motor for an electric oil pump according to any one of claims 1 to 11 , wherein an end surface on the other side of the rotating shaft directly faces the surface on the one side of the circuit board. The bus bar member includes a local recess on the other side,
The motor according to any one of claims 1 to 12 , wherein at least a part of the circuit component fixed to the surface on the one side of the circuit board is located inside the local recess. The motor for an electric oil pump according to any one of claims 1 to 13 , wherein at least a part of the circuit component is located inside the annular recess. A lid that covers the circuit board;
A support member provided between the lid and the motor housing for supporting the circuit board and housing the circuit board together with the lid;
And further
The electric oil pump according to any one of claims 1 to 14 , wherein a position at which the circuit board of the support member is supported is the one side of a position at which the support member and the lid contact with each other. Motor.

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