JP2019030215A - motor - Google Patents

Abstract

To provide a motor in which a bus bar and a bus holder are arranged to a motor part with high position accuracy, and a cost of the bus bar is suppressed low.SOLUTION: A motor 1 includes: a rotor having a shaft with a center axis J extended in an axial direction as a center; a stator which is arranged oppositely to the rotor, and includes a plurality of coils; a housing that houses the rotor and the stator; and a bus bar assembly 70 that is positioned on one direction side in an axial direction of the shaft. The bus bar assembly 70 includes: a plurality of bus bars 71 electrically connected to the plurality of coils of the stator; and a bus holder 80 holding the plurality of bus bars 71. At least one bus bar 71 among the plurality of bus bars 71 is placed on an arrangement surface part 80i provided on the bus holder 80 and is extended in a direction crossing the center axis J.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a motor.

  For example, Patent Documents 1 and 2 describe an electric pump in which a motor having a circuit board and a pump are integrated. In these circuit boards, the coil ends of the coils extending from the stator of the motor are electrically connected directly to the circuit board.

  On the other hand, depending on the circuit board mounted on the motor, the coil end of the coil may be connected to the circuit board via a bus bar provided on the bus bar holder. The bus bar has one end connected to the coil end and the other end connected to the circuit board, so that the call and the circuit board are electrically connected.

JP 2013-217223 A JP 2017-053323 A

  When a circuit board is mounted on a motor equipped with a bus bar holder, if the position of the circuit board connection terminal of the bus bar connected to the circuit board is shifted with respect to the bus bar holder or the position of the bus bar holder is shifted with respect to the motor, There is a possibility that the connection between the board connection terminal and the circuit board may be difficult. For this reason, there is a demand for arranging the bus bar and the bus bar holder with respect to the motor with high positional accuracy.

  In addition, since the bus bar is made of a relatively expensive material, there is a desire to reduce the cost of the bus bar.

  An object of the present invention is to provide a motor in which a bus bar and a bus bar holder are arranged with high positional accuracy with respect to a motor unit, and the cost of the bus bar is suppressed.

  An exemplary first invention of the present application includes a rotor having a shaft centering on a central axis extending in an axial direction, a stator disposed opposite to the rotor and having a plurality of coils, and the rotor and the stator accommodated therein And a bus bar assembly located on one axial side of the shaft, the bus bar assembly including a plurality of bus bars electrically connected to the plurality of coils of the stator, and a plurality of bus bars A bus bar holder that holds the bus bar, and at least one of the plurality of bus bars is placed on an arrangement surface portion provided on the bus bar holder and intersects the central axis It is a motor extending in the direction.

  According to the first exemplary invention of the present application, it is possible to provide a motor in which the bus bar and the bus bar holder are arranged with high positional accuracy with respect to the motor, and the cost of the bus bar can be suppressed.

It is sectional drawing of the electric oil pump which concerns on 1st Embodiment. It is a top view of the circuit board holding part concerning a 1st embodiment. It is an internal perspective view of the motor part which has the bus-bar holder which concerns on 1st Embodiment. It is a top view of the bus-bar holder which concerns on 1st Embodiment. It is sectional drawing of the bus-bar holder which concerns on 1st Embodiment. It is a cross-sectional perspective view of the support part of the bus-bar holder which concerns on 1st Embodiment. It is an expanded sectional view of the motor side flange part of the resin housing concerning a 1st embodiment.

  Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an electric oil pump in which a pump unit is disposed on one side of the motor in the axial direction to discharge oil will be described as an example. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale and number in each structure.

  In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction parallel to the other axial side of the central axis J shown in FIG. The X-axis direction is a direction parallel to the short direction of the electric oil pump shown in FIG. 1, that is, the left-right direction in FIG. The Y-axis direction is a direction 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 referred to as “rear side”, and the negative side (−Z side) in the Z-axis direction is referred to as “front side”. The rear side and the front side are simply names used for explanation, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as “axial direction”, a radial direction centered on the central axis J is simply referred to as “radial direction”, and the central axis J The circumferential direction centered on the axis, that is, the circumference of the central axis J (θ direction) is simply referred to as “circumferential direction”.

  In this specification, “extending in the axial direction” means not only extending in the axial direction (Z-axis direction) but also extending in a direction inclined by less than 45 ° with respect to the axial direction. Including. Further, in this specification, the term “extend in the radial direction” means 45 ° with respect to the radial direction in addition to the case where it extends strictly in the radial direction, that is, the direction perpendicular to the axial direction (Z-axis direction) Including the case of extending in a tilted direction within a range of less than.

[First embodiment]
<Overall configuration>
FIG. 1 is a cross-sectional view of the electric oil pump according to the first embodiment. As shown in FIG. 1, the electric oil pump 1 of the present embodiment includes a motor unit 10 and a pump unit 40. The motor unit 10 and the pump unit 40 are arranged along the axial direction. The motor unit 10 includes a shaft 11 disposed along a central axis J extending in the axial direction. The pump unit 40 is located on one side (front side) in the axial direction of the motor unit 10 and is driven by the motor unit 10 via the shaft 11 to discharge oil. Hereinafter, each constituent member will be described in detail.

<Motor unit 10>
As shown in FIG. 1, the motor unit 10 includes a resin housing 13, a rotor 20, a shaft 11, a stator 22, a rolling bearing 25, and a bus bar assembly 70.

  The motor unit 10 is, for example, an inner rotor type motor. The rotor 20 is fixed to the outer peripheral surface of the shaft 11, and the stator 22 is positioned on the radially outer side of the rotor 20. Moreover, the rolling bearing 25 is arrange | positioned at the rear side (+ Z side) edge part of the shaft 11, and supports the shaft 11 rotatably.

(Resin housing 13)
As shown in FIG. 1, the resin housing 13 includes a stator holding portion 13a, a circuit board holding portion 13b, and a pump body holding portion 13c. The stator holding part 13a, the circuit board holding part 13b, and the pump body holding part 13c are integrally formed of resin.

(Stator holding part 13a)
The stator holding portion 13a has a through hole 13a1 extending in the axial direction on the inner side. The shaft 11, the rotor 20, and the stator 22 of the motor unit 10 are disposed in the through hole 13a1. The outer surface of the stator 22, that is, the outer surface of a core back portion 22a described later is fitted to the inner surface of the stator holding portion 13a. Thereby, the stator 22 is accommodated in the stator holding part 13a.

  On the left side in the X-axis direction of the outer wall portion 13a2 of the stator holding portion 13a of the present embodiment, the left wall portion 13a3 in which the radial thickness of the resin increases from the front side (−Z side) to the rear side (+ Z side). Have Further, the right side in the X-axis direction of the outer wall portion 13a2 has an insertion hole portion 13a4 that extends in the X-axis direction and into which the external connector 90 is inserted. A bracket portion 13a5 that supports the insertion hole portion 13a4 is provided on the front side of the insertion hole portion 13a4. The rigidity of the insertion hole 13a4 is reinforced by the bracket part 13a5.

(Circuit board holding part 13b)
FIG. 2 is a plan view of the circuit board holder 13b according to the present embodiment. As shown in FIGS. 1 and 2, the circuit board holding portion 13b is continuously connected to the rear side end portion of the stator holding portion 13a. The circuit board holding portion 13b has a bottomed container shape that is open on the rear side and extends in the X-axis direction, and includes a container main body portion 13b1 and a container main body side flange portion 13b2.

  The container main body 13b1 has a substrate housing chamber 13b3. The substrate housing chamber 13b3 is open on the rear side, and the cover portion 15 covers the opening on the rear side of the substrate housing chamber 13b3. The container main body 13b1 is integrally formed of resin, and a plurality of protrusions 13b4 are provided at intervals on the inner surface and the bottom surface of the substrate housing chamber 13b3. The circuit board 16, the motor side terminal portions 74c, 75c, 76c, the connector side terminal 18 and the like are accommodated in the substrate accommodating chamber 13b3.

  The motor side terminal portions 74c, 75c, and 76c are arranged on the left side in the X-axis direction in the substrate housing chamber 13b3, one end side is electrically connected to the coil 22b of the motor unit 10, and the other end side is electrically connected to the circuit board 16. Connected. The connector-side terminal 18 is disposed on the right side in the X-axis direction in the substrate housing chamber 13b3, and one end side is electrically connected to the external connector 90 and the other end side is electrically connected to the circuit board 16. The motor side terminal portions 74c, 75c, and 76c constitute a part of a bus bar 71 (see FIG. 4) described later.

  The circuit board 16 outputs a motor output signal. In the present embodiment, the circuit board 16 is disposed on the rear side of the board housing chamber 13b3 and extends in the X-axis direction. A plurality of electronic components and a printed wiring (not shown) are provided on the back surface (front side surface) of the circuit board 16. On the left side of the circuit board 16 in the X-axis direction, tip portions of the motor side terminal portions 74c, 75c, and 76c protrude and are electrically connected. In the present embodiment, three motor side terminal portions 74c, 75c, and 76c are connected to the circuit board 16 with an interval in the Y-axis direction. Further, by using a copper inlay substrate as the circuit board 16, heat generated by a heating element (not shown) can be radiated through the cover portion 15.

  The cover portion 15 is made of a metal material, has a large heat capacity, and has a large surface area, and therefore has a high heat dissipation effect. In this embodiment, the cover part 15 protrudes outward from the top part 15a extended along the circuit board 16, the side wall part 15b extended to the front side from the outer edge part of the top part 15a, and the front side edge part of the side wall part 15b. Cover side flange section 15c.

  The cover-side flange portion 15c is disposed to face the container main body side flange portion 13b2 provided in the container main body portion 13b1, and is fixed to the container main body side flange portion 13b2 by fastening means such as bolts. The top portion 15a has a recess 15d that is recessed toward the circuit board 16 on the left side in the X-axis direction. The tip of the recess 15d contacts the circuit board 16 via a heat transfer member (not shown). For this reason, the heat generated from the circuit board 16 can be effectively radiated through the heat transfer member and the cover portion 15.

(Pump body holding part 13c)
As shown in FIG. 1, the pump body holding portion 13c has a cylindrical shape with an open front side, and is continuously connected to the front side end of the stator holding portion 13a. The pump body holding portion 13c has a hole portion 13c1 extending in the axial direction on the inner side. The inner diameter of the hole 13c1 is slightly larger than the outer diameter on the rear side of the pump body 52 of the pump section 40 described later. The rear side of the pump body 52 is fitted to the inner side surface of the hole 13c1.

  The outer surface 13c2 of the pump body holding portion 13c has a motor side flange portion 13c3 protruding in the radial direction. The motor side flange portion 13c3 is disposed to face a pump side flange portion 52a provided in the pump body 52 described later, and is fixed to the pump side flange portion 52a by fastening means such as a bolt. Thereby, the pump part 40 is fixed to the resin housing 13.

(Rotor 20)
The rotor 20 includes a rotor core 20a and a rotor magnet 20b. The rotor core 20a is fixed to the shaft 11 so as to surround the shaft 11 around the axis (θ direction). The rotor magnet 20b is fixed to the outer surface along the axis (θ direction) of the rotor core 20a. The rotor core 20a and the rotor magnet 20b rotate together with the shaft 11. The rotor 20 may be an embedded magnet type in which a permanent magnet is embedded in the rotor 20. Compared with the surface magnet type in which the permanent magnet is provided on the surface of the rotor 20, the embedded magnet type rotor 20 can reduce the possibility of the magnet peeling off due to centrifugal force, and actively uses the reluctance torque. can do.

(Stator 22)
The stator 22 surrounds the rotor 20 around the axis (θ direction), and rotates the rotor 20 around the central axis J. The stator 22 includes a core back portion 22a, a teeth portion 22c, a coil 22b, and an insulator (bobbin) 22d.

  The shape of the core back portion 22 a is a cylindrical shape that is concentric with the shaft 11. The teeth part 22c extends toward the shaft 11 from the inner surface of the core back part 22a. A plurality of teeth portions 22c are provided, and are arranged at equal intervals in the circumferential direction of the inner surface of the core back portion 22a. The coil 22b is provided around an insulator (bobbin) 22d, and is formed by winding a conductive wire 22e. An insulator (bobbin) 19 is attached to each tooth portion 22c. The stator 22 has a resin mold portion 22f in which a core back portion 22a, a teeth portion 22c, a coil 22b, and an insulator (bobbin) 22d are covered with a resin during integral molding with resin.

(Rolling bearing 25)
The rolling bearing 25 is disposed on the rear side (+ Z side) of the rotor 20 and the stator 22 and is held by the rolling bearing holding unit 30. The rolling bearing 25 supports the shaft 11. The shape, structure and the like of the rolling bearing 25 are not particularly limited, and any known bearing can be used.

(Shaft 11)
As shown in FIG. 1, the shaft 11 extends along the central axis J and penetrates the motor unit 10. The front side (−Z side) of the shaft 11 protrudes from the motor unit 10 and extends into the pump unit 40. The front side (−Z side) of the shaft 11 is supported by a slide bearing 45 in the pump body 52 described later.

(Bus bar assembly 70)
FIG. 3 is an internal perspective view of the motor unit 10 having the bus bar holder 80 according to the present embodiment. FIG. 4 is a plan view of the bus bar holder 80 according to the present embodiment. As shown in FIGS. 3 and 4, the bus bar assembly 70 is located between the rolling bearing holding portion 30 and the substrate housing chamber 13b3 (see FIG. 1). The bus bar assembly 70 is integrated with the resin housing 13 (see FIG. 1) by insert molding. The bus bar assembly 70 is an integrally molded product made of resin. That is, the bus bar assembly 70 is a primary molded product, and the resin housing 13 including the bus bar assembly 70 is a secondary molded product.

  The bus bar assembly 70 includes a plurality of bus bars 71 that are electrically connected to the plurality of coils 22 b (see FIG. 1) of the stator 22, and a bus bar holder 80 that holds the plurality of bus bars 71. The bus bar holder 80 has a plate-shaped holder main body 80a. The holder body 80a has a circular shape when viewed in the axial direction.

(Bus bar holder 80)
The bus bar holder 80 is disposed at a position that intersects the central axis J of the shaft 11. In the illustrated embodiment, the bus bar holder 80 is disposed at a position that is coaxial with the central axis J of the shaft 11 and orthogonal to the central axis J. The holder main body 80a is disposed on the rear side (+ Z side) end of the stator 22. In this embodiment, the holder main body 80a is placed on the insulator 22d of the motor unit 10, and the outer diameter of the holder main body 80a is slightly larger than the outer diameter of the insulator 22d.

  The holder body 80a has a plurality of through holes 80b. A plurality of through-holes 80b are arranged at intervals in the circumferential direction where the holder main body 80a and the stator 22 overlap in the axial direction. In the present embodiment, the holder body 80a has a plurality of circular through holes 80b1 and square through holes 80b2 in the circumferential direction of the peripheral edge of the holder body 80a. Further, the holder main body 80a has a plurality of circular through holes 80b1 around the center of the holder main body 80a.

  In these through holes 80b, the resin flows through the through holes 80b toward the stator 22 and the resin housing 13 when the bus bar assembly 70 is insert-molded. Therefore, when the resin is cured, the holder body 80a (bus bar holder 80) is fixed to the stator 22 and the resin housing 13 through the cured resin through the through hole 80b.

  FIG. 5 is a cross-sectional view of the bus bar holder 80 according to the present embodiment. As shown in FIG. 5, the holder main body 80 a has a flange 80 c that protrudes radially outward from the insulator 22 d provided on the stator 22. The front side (−Z side) of the flange portion 80c has an insertion recess 80d into which the rear side end portion of the insulator 22d is inserted.

  As shown in FIG. 4, a positioning portion 80m that protrudes in the axial direction is provided on either the rear side end portion of the insulator 22d or the flange portion 80c. A positioning hole portion 80f into which the positioning portion 80m is inserted is provided at either the rear end portion of the insulator 22d or the flange portion 80c.

  In the present embodiment, a pin 80e1 serving as a positioning portion 80m protruding in the axial direction is provided at the rear side end portion of the insulator 22d. Two pins 80e1 are provided at intervals in the circumferential direction of the insulator 22d. On the other hand, two positioning hole portions 80f are provided in the circumferential portion of the holder main body portion 80a with an interval in the circumferential direction. The pins 80e1 are fitted into these positioning holes 80f, and the circumferential direction and the radial positioning of the holder main body 80a with respect to the stator 22 can be performed. The number of pins 80e1 and positioning holes 80f may be at least two and may be three or more.

  The holder main body portion 80a has a terminal holding portion 85 that protrudes to the rear side on the left side in the X-axis direction. Details of the terminal holding portion 85 will be described later.

  The holder body 80a has a flat surface 80h on the rear side. The surface 80h has a plurality of arrangement surface portions 80i on which the plurality of bus bars 71 are arranged. In the present embodiment, the placement surface portion 80i includes a first placement surface portion 80i1, a second placement surface portion 80i2, and a third placement surface portion 80i3. The first arrangement surface portion 80i1 extends in the radial direction of the holder main body portion 80a through the central axis J. The second placement surface portion 80i2 is located on the left side in the X-axis direction of the holder main body portion 80a on the one side (+ side) in the Y-axis direction with respect to the first placement surface portion 80i1, and extends radially outward with respect to the central axis J. The third arrangement surface portion 80i3 is located on the left side in the X axis direction on the other side (− side) in the Y axis direction than the first arrangement surface portion 80i1, and extends in the X axis direction.

  The first arrangement surface portion 80i1 is connected to the first straight center surface portion 80i1a extending linearly to the left in the X-axis direction through the central axis J, and to the right end in the X-axis direction of the first straight center surface portion 80i1a. As it progresses, it is connected to the left end of the first right extending surface portion 80i1b that extends in a straight line and inclines toward the Y-axis direction, and the first straight central surface portion 80i1a. And a first left extending surface portion 80i1c that is inclined to the side and extends linearly.

  The second disposition surface portion 80i2 is connected to the second straight surface portion 80i2a extending linearly along the Y-axis direction + side of the first left extending surface portion 80i1c, and the left end in the X-axis direction of the second straight surface portion 80i2a. And a second left extending surface portion 80i2b extending to the left. The third arrangement surface portion 80i3 includes a third straight surface portion 80i3a that is located on the Y-axis direction negative side of the first left extending surface portion 80i1c and extends linearly along the first straight center surface portion 80i1a.

  The arrangement surface portion 80 i has a pair of guide walls 82 that extend along both lateral sides of the bus bar 71 and protrude from the arrangement surface portion 80 i, and the bus bar 71 is disposed between the pair of guide walls 82. In the present embodiment, a pair of guide walls 82 are provided on both sides of the first arrangement surface portion 80i1, the second arrangement surface portion 80i2, and the third arrangement surface portion 80i3 in the short direction.

  FIG. 6 is a cross-sectional perspective view of the support portion 86 of the bus bar holder 80 according to the present embodiment. As shown in FIG. 6, the bus bar holder 80 has a terminal holding portion 85 that protrudes rearward on the left side in the X-axis direction. The terminal holding part 85 has a rectangular parallelepiped shape, and the longitudinal direction of the terminal holding part 85 extends along the Y-axis direction. A vertical groove 85c extending along the motor-side terminal portion 75c of the bus bar 71 is provided on the side surface 85a on the right side in the X-axis direction of the terminal holding portion 85 and the rear-side top surface 85b. The vertical groove 85c extends in the axial direction and opens to the side surface 85a and the top surface 85b. A vertical groove 85c into which the motor-side terminal portions 75c and 76c of the second bus bar 75 and the third bus bar 76 are inserted is provided on the Y axis direction − side of the vertical groove 85c.

  The motor side terminal portion 75c has a bent portion 75c1 at an axially intermediate portion. In the illustrated embodiment, the bent portion 75c1 is bent stepwise (L-shaped) toward the left in the X-axis direction. The motor side terminal portions 74c and 76c have bent portions 74c1 and 76c1 (see FIG. 3) similarly to the motor side terminal portion 75c.

  The front side of the motor side terminal portion 75c is inserted into the vertical groove portion 85c. The bent portion 75c1 of the motor side terminal portion 75c is disposed to face the rear opening of the vertical groove portion 85c with a gap. The rear side of the motor side terminal portion 75c extends from the bent portion 75c1 to the rear side. For this reason, when the bus bar assembly 70 is integrally molded with the resin housing 13, if the motor side terminal portion 75c is pushed to the left in the X-axis direction due to the resin pressure, the motor side terminal portion 75c may be inclined. Since the rear side is inserted into the vertical groove portion 85c, it is possible to suppress the possibility that the rear side of the motor side terminal portion 75c is inclined to the left in the X-axis direction.

  Moreover, since the motor side terminal part 75c is inserted in the vertical groove part 85c, the pressing force to the motor side terminal part 75c by resin pressure is suppressed. For this reason, the possibility that the rear side of the motor side terminal portion 75c is inclined to the left in the X-axis direction can be further suppressed.

  Further, the rear side end portion of the motor side terminal portion 75c is welded and electrically connected to the circuit board 16, as shown in FIGS. When the rear side end portion of the motor side terminal portion 75c is welded to the circuit board 16, there is a possibility that the motor side terminal portion 75c extends in the axial direction due to heat and biases the circuit board 16. However, the urging force acting on the circuit board 16 can be reduced by deforming the bent portion 75c1 provided in the motor side terminal portion 75c. In addition, when the motor side terminal part 75c receives heat and expand | extends, the bending part 75c1 will deform | transform into the vertical groove part 85c side. For this reason, since the bent part 75c1 moves into the vertical groove part 85c, the movement of the bent part 75c1 is not limited.

  Here, when the bus bar assembly 70 is integrally formed with the resin housing 13, the resin pressure acts on the terminal holding portion 85, and the left side in the X-axis direction of the bus bar holder 80 moves to the front side via the terminal holding portion 85. There is a risk of deformation in the direction of bending. Therefore, the terminal holding portion 85 includes a support portion 86 that extends to the front side from the peripheral edge portion of the holder main body portion 80a. The support portion 86 has a step portion 86 a that contacts the rear side end portion of the stator 22 of the motor portion 10.

  In the illustrated embodiment, the support portion 86 has a wall portion 86 b that curves along the outer peripheral surface of the rear side end portion of the stator 22. The wall portion 86b has a width slightly larger than the width of the terminal holding portion 85 in the longitudinal direction (Y-axis direction). A step portion 86a that contacts the rear side end portion of the stator 22 is provided at the front side end portion of the wall portion 86b. Therefore, the resin pressure acting on the terminal holding portion 85 can be supported by the rear end portion of the stator 22 via the support portion 86 by the rear end portion of the stator 22 coming into contact with the step portion 86a. .

  In addition, a plurality of ribs 88 extending in the axial direction are provided on the radially outer surface of the wall portion 86b with an interval in the circumferential direction.

(Bus bar 71)
As shown in FIG. 4, the bus bar 71 is made of a metal material, for example, tin-plated copper in which tin is plated on copper. The bus bar 71 includes a first bus bar 74 disposed on the first placement surface portion 80i1, a second bus bar 75 disposed on the second placement surface portion 80i2, and a third bus bar 76 disposed on the third placement surface portion 80i3. And having.

  The first bus bar 74 includes a bus bar main body portion 74a, a coil side terminal portion 74b connected to one end side of the bus bar main body portion 74a, and a motor side terminal portion 74c connected to the other end side of the bus bar main body portion 74a. The second bus bar 75 includes a bus bar main body 75a, a coil side terminal 75b connected to one end of the bus bar main body 75a, and a motor side terminal 75c connected to the other end of the bus bar main body 75a. The third bus bar 76 includes a bus bar main body portion 76a, a coil side terminal portion 76b connected to one end side of the bus bar main body portion 76a, and a motor side terminal portion 76c connected to the other end side of the bus bar main body portion 76a.

  The bus bar main body 74a of the first bus bar 74 includes a first straight line portion 74a1 placed on the first straight central surface portion 80i1a, a first right stretched portion 74a2 placed on the first right stretched surface portion 80i1b, And a first left extending portion 74a3 placed on the first left extending surface portion 80i1c. The first straight portion 74a1 passes on the central axis J. The coil side terminal portion 74b connected to the side end portion of the first right extending portion 74a2 has a conductive wire connection portion 74b1 that electrically connects the conductive wire 22e of the coil 22b extending from the stator 22 to the rear side.

  The conductive wire connecting portion 74b1 is supported by a connection terminal holding portion 80k1 provided to protrude from the rear peripheral edge portion of the holder main body portion 80a. In the present embodiment, the coil 22b of the motor unit 10 is a three-phase winding, and in order to connect the coil 22b corresponding to any of the U phase, V phase, and W phase and the bus bar 71, the connection terminal holding unit 80k1, k2, and k3 are provided at three locations at equal intervals in the circumferential direction of the peripheral edge of the holder main body 80a.

  In the present embodiment, the first bus bar 74 is connected to the coil 22b of the stator 22 at one end portion of the first bus bar 74, and is located at a position opposite to the one end portion of the first bus bar 74 with the central axis J as the center. When disposing the other end portion of the first bus bar 74, an example of the disposition of the first bus bar 74 when the imaginary line L connecting the one end portion and the other end portion of the first bus bar 74 is shifted with respect to the central axis J. I have to.

  In such a case, in the present embodiment, the first straight portion 74a1 is disposed at a position intersecting the central axis J, and the first right extending portion 74a2 is connected to the connection terminal holding portion 80k1 from one longitudinal end portion of the first straight portion 74a1. The first left extending portion 74a3 is linearly extended from the other longitudinal end of the first straight portion 74a1 toward the terminal holding portion 85 that supports the motor side terminal portion 75c. Therefore, as compared with the case where the first straight line portion 74a1 does not extend in the direction intersecting the central axis J, the first bus bar 74 can be disposed at the shortest distance.

  In the illustrated embodiment, the case where one longitudinal direction side of the first straight line portion 74a1 is arranged at a position intersecting the central axis is shown, but the middle portion in the longitudinal direction or the other longitudinal direction side of the first straight line portion 74a1 is the center. You may arrange | position in the position which cross | intersects the axis | shaft J.

  The bus bar body 75a of the second bus bar 75 includes a second straight line portion 75a1 placed on the second straight face portion 80i2a and a second left stretched portion 75a3 placed on the second left stretched surface portion 80i2b. Have. The coil-side terminal portion 75b connected to the right end portion in the X-axis direction of the second straight portion 75a1 is supported by the connection terminal holding portion 80k2.

  The bus bar main body portion 76a of the third bus bar 76 has a third straight portion 76a1 placed on the third straight surface portion 80i3a. The coil side terminal portion 76b connected to the right end portion in the X-axis direction of the third straight portion 76a1 is supported by the connection terminal holding portion 80k3.

  Each of the first bus bar 74, the second bus bar 75, and the third bus bar 76 has a fixing hole 77 penetrating in the axial direction. In the illustrated embodiment, the first bus bar 74 has a fixing hole 77 at the left end portion in the X-axis direction of the first linear portion 74a1. The second bus bar 75 has a fixing hole 77 at the right end in the X-axis direction of the second linear portion 75a1. The third bus bar 76 has a fixing hole 77 at the right end in the X-axis direction of the third linear portion 76a1.

  On the other hand, as shown in FIGS. 4 and 6, the bus bar holder 80 has a communication hole 89 at a position overlapping the fixing hole 77 of the bus bar 71 in a state where the bus bar 71 is arranged on the arrangement surface portion 80 i. In the present embodiment, the bus bar holder 80 has a communication hole 89 that communicates with the fixing hole 77 at the left end portion in the X-axis direction of the first straight central surface portion 80i1a of the first arrangement surface portion 80i1. The bus bar holder 80 has a communication hole 89 that communicates with the fixing hole 77 at the right end in the X-axis direction of the second linear surface portion 80i2a of the second arrangement surface portion 80i2. Furthermore, the bus bar holder 80 has a communication hole 89 that communicates with the fixing hole 77 at the left end portion in the axial direction of the third linear surface portion 80i3a of the third arrangement surface portion 80i3.

  Therefore, when the resin flows through the fixing hole 77 and the communication hole 89 during the insert molding and the resin is cured in the fixing hole 77 and the communication hole 89, the bus bar 71 can be fixed to the bus bar holder 80 by the cured resin. .

  The placement surface portion 80i has a positioning portion 80m that positions the bus bar 71 at a predetermined position of the placement surface portion 80i. The bus bar 71 has a positioning hole portion 78 that fits with the positioning portion 80m. In the present embodiment, a positioning hole 78 is provided at the left end in the X-axis direction of the first left extending portion 74a3 of the first bus bar 74. A positioning hole 78 is provided at the left end of the second left extending portion 75a3 of the second bus bar 75 in the X-axis direction. A positioning hole 78 is provided at the left end of the third straight portion 76a1 of the third bus bar 76 in the X-axis direction.

  On the other hand, a positioning portion 80m that is passed through the positioning hole 78 is provided at the left end portion in the X-axis direction of the first left extending surface portion 80i1c of the first arrangement surface portion 80i1. In the present embodiment, the positioning portion 80 m is a positioning projection that is passed through the positioning hole 78. A positioning portion 80m is provided at the left end portion in the X-axis direction of the second left extending surface portion 80i2b of the second arrangement surface portion 80i2. A positioning portion 80m is provided on the left end portion in the X-axis direction of the third linear surface portion 80i3a of the third arrangement surface portion 80i3.

  In the positioning portion 80m of the positioning projection passed through the positioning hole 78, the tip of the positioning portion 80m protruding from the positioning hole 78 is crushed and crimped at the time of molding by the mold, and the bus bar 71 is attached to the arrangement surface portion 80i. Positioned.

<Pump unit 40>
As shown in FIG. 1, the pump unit 40 is located on one axial side of the motor unit 10, specifically, on the front side (−Z side). The pump unit 40 is driven through the shaft 11 by the motor unit 10. The pump unit 40 includes a pump rotor 47 and a pump housing 51. The pump housing 51 includes a pump body 52 and a pump cover 57. Hereinafter, each component will be described in detail.

(Pump body 52)
The pump body 52 is fixed in the front side (−Z side) of the resin housing 13 on the front side (−Z side) of the motor unit 10. The pump body 52 includes a housing portion 53 that houses the pump rotor 47 and has a side surface and a bottom surface located on the rear side (+ Z side) of the motor unit 10. The accommodating portion 53 opens to the front side (−Z side) and is recessed to the rear side (+ Z side). The shape of the accommodating portion 53 viewed from the axial direction is a circular shape.

  The pump body 52 has a recess 54 that is recessed from the rear side (+ Z side) surface to the front side (−Z side). A seal member 59 is accommodated in the recess 54. The shape of the recess 54 viewed from the axial direction is a circular shape.

  The pump body 52 has a through hole 55 penetrating along the central axis J. The through-hole 55 is open at both ends in the axial direction and allows the shaft 11 to pass therethrough. The rear side (+ Z side) opening opens toward the recess 54. The opening on the front side (−Z side) opens into the accommodating portion 53. The through hole 55 functions as a slide bearing 45 that supports the shaft 11 rotatably.

  FIG. 7 is an enlarged cross-sectional view of the motor-side flange portion 13c3 of the resin housing 13 according to the first embodiment. The pump body 52 has a step portion 61 that is recessed inward in the radial direction on the outer side surface on the radially outer side on the rear side (+ Z side). The step portion 61 has an annular end wall surface 61a. The resin housing 13 can be positioned in the axial direction with respect to the pump body 52 by the front side end portion 13d of the resin housing 13 coming into contact with the end wall surface 61a. In the present embodiment, as shown in FIG. 7, the front-side end portion 13d of the resin housing 13 contacts the end wall surface 61a via the metal plate 63 disposed on the end wall surface 61a. The step portion 61 is located between the seal member 59 provided in the recess 54 and the accommodating portion 53. The step portion 61 is located between the seal member 59 provided in the recess 54 and the accommodating portion 53.

  In the present embodiment, the metal plate 63 is provided between the resin housing 13 and the pump body 52. The resin housing 13 is inserted with a collar 69 having knurled eyes on the outer surface and female threads on the inner peripheral surface. Specifically, it is inserted on the step portion 61. The metal plate 63 has a size substantially equal to the size in the radial direction of the front end portion 13 d of the resin housing 13. The reason why the metal plate 63 is disposed between the resin housing 13 and the pump body 52 is as follows. The outer shape of the resin housing 13 cannot be increased due to the installation space of the electric oil pump 1. For this reason, the thickness of the collar 69 of the resin housing 13 that contacts the pump body 52 of the resin housing 13 cannot be sufficiently secured. Therefore, when the resin housing 13 and the pump body 52 are fastened, the pump body 52 may be buckled. Therefore, by inserting an iron metal plate 63 between the resin housing 13 and the pump body 52, buckling can be prevented even if the collar 69 is not sufficiently thick and the pump body 52 is made of aluminum. .

  A peripheral wall surface 64 extends continuously to the rear side (+ Z side) at the radially inner end of the end wall surface 61a. On the rear side (+ Z side) of the peripheral wall surface 64, an annular recess 65 that is recessed radially inward is provided. A seal member 66 is provided in the recess 65. In the illustrated embodiment, the recess 65 is provided with an O-ring.

  A pump-side flange portion 52 a is provided on the outer side in the radial direction from the end wall surface 61 a of the step portion 61. The pump-side flange portion 52a extends continuously from the end wall surface 61a. In this embodiment, the pump side flange part 52a is provided in four places at intervals in the circumferential direction.

  The pump side flange portion 52a is disposed to face the motor side flange portion 13c3 in a state where the front side end portion 13d of the resin housing 13 is in contact with the stepped portion 61, and between the pump side flange portion 52a and the motor side flange portion 13c3. The motor part 10 can be fixed to the pump part 40 by fastening with fastening means such as bolts.

(Pump rotor 47)
The pump rotor 47 is attached to the shaft 11. More specifically, the pump rotor 47 is attached to the front side (−Z side) of the shaft 11. The pump rotor 47 includes an inner rotor 47a attached to the shaft 11 and an outer rotor 47b surrounding the radially outer side of the inner rotor 47a. The inner rotor 47a is annular. The inner rotor 47a is a gear having teeth on the radially outer surface.

  The inner rotor 47a is fixed to the shaft 11. More specifically, the front side (−Z side) end of the shaft 11 is press-fitted into the inner rotor 47a. The inner rotor 47a rotates around the axis (θ direction) together with the shaft 11. The outer rotor 47b has an annular shape surrounding the radially outer side of the inner rotor 47a. The outer rotor 47b is a gear having teeth on the radially inner side surface.

  The inner rotor 47a and the outer rotor 47b mesh with each other, and the outer rotor 47b rotates as the inner rotor 47a rotates. That is, the pump rotor 47 is rotated by the rotation of the shaft 11. In other words, the motor unit 10 and the pump unit 40 have the same rotation axis. Thereby, it can suppress that the electric oil pump 1 enlarges to an axial direction.

  Further, the rotation between the inner rotor 47a and the outer rotor 47b changes the volume between the meshing portions of the inner rotor 47a and the outer rotor 47b. A region where the volume decreases is a pressurized region, and a region where the volume increases is a negative pressure region. A suction port is disposed on the front side (−Z side) of the negative pressure region of the pump rotor 47. Further, a discharge port is arranged on the front side (−Z side) of the pressurizing region Ap of the pump rotor 47. Here, the oil sucked into the accommodating portion 53 from the suction port 57a provided in the pump cover 57 is accommodated in a volume portion between the inner rotor 47a and the outer rotor 47b and sent to the pressurizing region. Thereafter, the oil is discharged from a discharge port 57b provided in the pump cover 57 through a discharge port.

(Pump cover 57)
As shown in FIG. 1, the pump cover 57 covers the pump body 52 from the front side (−Z side), thereby providing an accommodation portion 53 between the pump cover 57 and the pump body 52. In the present embodiment, the pump cover 57 is attached to the front side (−Z side) of the pump body 52 and closes the opening 53 a that opens to the front side (−Z side) of the housing portion 53, thereby A housing portion 53 is provided between the cover 57 and the pump body 52.

<Operation and effect of electric oil pump 1>
Next, the operation and effect of the electric oil pump 1 will be described. As shown in FIG. 1, when the motor unit 10 of the electric oil pump 1 is driven, the shaft 11 of the motor unit 10 rotates, and the outer rotor 47 b rotates as the inner rotor 47 a of the pump rotor 47 rotates. When the pump rotor 47 rotates, the oil sucked from the suction port 57a of the pump unit 40 moves in the housing portion 53 of the pump unit 40, and is discharged from the discharge port 57b through the discharge port.

(1) Here, in the electric oil pump 1 according to the present embodiment, at least one bus bar 71 among the plurality of bus bars 71 is placed on the arrangement surface portion 80i provided on the bus bar holder 80, and the central axis It extends in the direction crossing J. For this reason, when one end of the bus bar 71 is electrically connected to the coil 22b of the stator 22 and the other end of the bus bar 71 is disposed at a position opposite to the one end of the bus bar 71 with the central axis J being the center, The bus bar 71 can be arranged on the arrangement surface portion 80i with the shortest distance. For this reason, it is possible to provide the motor unit 10 (electric oil pump 1) in which the increase in the length of the bus bar 71 is suppressed and the cost is suppressed.

(2) Since the bus bar 71 extends linearly on the arrangement surface portion 80i, the bus bar 71 can be arranged in the radial direction. For this reason, the length of the bus bar 71 in the longitudinal direction can be further shortened.

(3) Since the bus bar holder 80 is disposed at a position intersecting the central axis J, the bus bar 71 can be disposed at the shortest distance in a state where the bus bar 71 is placed on the arrangement surface portion 80i of the bus bar holder 80. .

(4) Since the housing is the resin housing 13, the motor unit 10 can be reduced in weight. Since the bus bar assembly 70 is integrated with the resin housing 13 by insert molding, the bus bar assembly 70 is positioned with respect to the resin housing 13 at the time of insert molding. For this reason, the positional accuracy with respect to the resin housing 13 of the bus-bar assembly 70 can be improved.

(5) The bus bar holder 80 has through holes 80b that open on both sides in the axial direction, and the bus bar holder 80 is fixed to the resin housing 13 with a resin filled in the through holes 80b during insert molding. For this reason, the bus bar holder 80 can be fixed in a state of being accurately arranged on the resin housing 13.

(6) The bus bar holder 80 has a plate-shaped holder main body 80a, the holder main body 80a has a surface 80h on one side in the axial direction, and each of the plurality of bus bars 71 is arranged on the surface 80h. It has a plurality of arrangement surface portions 80i. For this reason, a plurality of bus bars 71 can be arranged corresponding to each.

(7) The arrangement surface portion 80 i has a pair of guide walls 82 extending along both lateral sides of the bus bar 71 and protruding from the arrangement surface portion 80 i, and the bus bar 71 is arranged between the pair of guide walls 82. For this reason, the bus bar 71 can be arranged on the arrangement surface portion 80i corresponding to the bus bar 71, and erroneous arrangement can be prevented. Further, since the pair of guide walls 82 extend along both side surfaces of the bus bar 71, the bus bar 71 can be positioned between the pair of guide walls 82. Moreover, the possibility that the bus bar 71 is displaced during insert molding can be suppressed.

(8) The placement surface portion 80i has a positioning portion 80m that positions the bus bar 71 at a predetermined position of the placement surface portion 80i, and the bus bar 71 has a positioning hole portion 78 that fits with the positioning portion 80m. For this reason, the bus bar 71 can be positioned on the arrangement surface portion 80i by fitting the positioning portion 80m into the positioning hole 78. Moreover, the possibility that the bus bar 71 may shift during insert molding can be suppressed.

(9) Each of the plurality of bus bars 71 has a fixing hole 77, and the bus bar holder 80 has a communication hole 89 at a position overlapping the fixing hole 77 of the bus bar 71 in a state where the bus bar 71 is arranged on the arrangement surface portion 80i. For this reason, when the resin filled in the fixing hole 77 and the communication hole 89 is cured at the time of insert molding, the bus bar 71 can be fixed to the bus bar holder 80 by the cured resin.

(10) The holder main body 80a is disposed on one axial end of the stator 22, the holder main body 80a has a plurality of through holes 80b, and the through holes 80b include the holder main body 80a and the stator 22. Are arranged at intervals in the circumferential direction at positions overlapping in the axial direction. For this reason, the holder main body 80a can fix the holder main body 80a to the stator 22 and the resin housing 13 by the cured resin when the resin filled in the through hole 80b is hardened at the time of insert molding.

(11) The holder main body portion 80a has a flange portion 80c that protrudes radially outward from the insulator 22d provided on the stator 22, and the other axial side of the flange portion 80c is one end in the axial direction of the insulator 22d. It has an insertion recess 80d into which the part is inserted. For this reason, the holder body 80a can be positioned in the axial direction with respect to the insulator 22d. Moreover, it has the positioning part 80m which protrudes in an axial direction in any one of the axial direction one side edge part of the insulator 22d, and the flange part 80c, and it exists in either one of the axial direction one side edge part of the insulator 22d, and the flange part 80c. A positioning hole 78 into which the positioning portion 80m is inserted is provided. For this reason, the holder main-body part 80a can be positioned with respect to the insulator 22d.

(12) The terminal holding portion 85 includes a support portion 86 extending to the other side in the axial direction from the peripheral edge portion of the holder main body portion 80a. For this reason, it is possible to prevent the motor side terminal portions 74c, 75c, and 76c from being inclined due to the resin pressure during the insert molding. Further, the terminal holding portion 85 has a support portion 86 that extends to the other side in the axial direction from the peripheral edge portion of the holder main body portion 80 a, and the support portion 86 is a stepped portion that comes into contact with one end portion in the axial direction of the resin housing 13. 86a. For this reason, when a resin pressure acts on the terminal holding part 85 at the time of insert molding, the resin pressure is supported at one end in the axial direction of the resin housing 13 via the support part 86 and the step part 86a. For this reason, a possibility that the terminal holding | maintenance part 85 side of the holder main-body part 80a may deform | transform can be prevented.

(13) Since the radially outer surface of the support portion 86 includes the rib 88 extending in the axial direction, the rigidity of the support portion 86 in the axial direction can be improved.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. These embodiments and modifications thereof are included in the scope and gist of the invention, and at the same time, are included in the name of the claims and their equivalents.

  In the embodiment described above, the electric oil pump 1 in which the pump unit 40 is integrated with the motor unit 10 is taken as an example of an embodiment of the motor, but is not limited thereto. A motor without the pump unit 40 may be used.

  Moreover, although embodiment mentioned above demonstrated the case where the number of the bus bars 71 corresponding to any one of U phase, V phase, and W phase was three, it is not restricted to this. The number of bus bars 71 may be changed according to the number of phases and the number of slots of the motor unit.

10 Motor part 11 Shaft 13 Resin housing (housing)
20 rotor 22 stator 22a coil 22d insulator 70 bus bar assembly 71 bus bar 74a, 75a, 76a bus bar body 74c, 75c, 76c motor side terminal 77 fixing hole 78 positioning part 80 bus bar holder 80a holder body 80b through hole 80c flange 80d Insertion recessed part 80h surface 80i arrangement surface part 80m positioning part 82 guide wall 85 terminal holding part 86 support part 86a step part 88 rib 89 communication hole J central axis

Claims (13)

A rotor having a shaft about a central axis extending in the axial direction;
A stator disposed opposite to the rotor and having a plurality of coils;
A housing for housing the rotor and the stator;
A bus bar assembly located on one axial side of the shaft,
The bus bar assembly is
A plurality of bus bars electrically connected to the plurality of coils of the stator;
A bus bar holder for holding a plurality of the bus bars,
At least one of the bus bars is a motor that is placed on an arrangement surface provided on the bus bar holder and extends in a direction intersecting the central axis. The motor according to claim 1, wherein the bus bar extends linearly on the arrangement surface portion. The motor according to claim 1, wherein the bus bar holder is disposed at a position intersecting with the central axis. The housing is a resin housing;
4. The motor according to claim 1, wherein the bus bar assembly is integrated with the resin housing by insert molding. 5. The bus bar holder has through holes that are open on both sides in the axial direction,
The motor according to claim 4, wherein the bus bar holder is fixed to the resin housing by a resin filled in the through hole during insert molding. The bus bar holder has a plate-shaped holder main body,
The holder body has a surface on one side in the axial direction,
The motor according to claim 5, wherein the surface has a plurality of the arrangement surface portions on which the plurality of bus bars are respectively arranged. The arrangement surface portion has a pair of guide walls extending along both lateral sides of the bus bar and projecting from the arrangement surface portion,
The motor according to claim 6, wherein the bus bar is disposed between the pair of guide walls. The arrangement surface portion has a positioning portion for positioning the bus bar at a predetermined position of the arrangement surface portion,
The motor according to claim 7, wherein the bus bar has a positioning hole portion that fits with the positioning portion. Each of the plurality of bus bars has a fixing hole,
The motor according to any one of claims 6 to 8, wherein the bus bar holder has a communication hole at a position overlapping the fixing hole of the bus bar in a state where the bus bar is arranged on the arrangement surface portion. The holder main body is disposed on one end of the stator in the axial direction,
The holder body has a plurality of the through holes,
The motor according to claim 6, wherein a plurality of the through holes are arranged at intervals in a circumferential direction at a position where the holder main body portion and the stator overlap in the axial direction. The holder main body portion has a flange portion that protrudes radially outward from an insulator provided in the stator,
The other axial side of the flange portion has an insertion recess into which an axial one side end of the insulator is inserted,
A positioning portion that protrudes in the axial direction at either one of the axial end portion of the insulator and the flange portion;
The motor according to claim 10, further comprising a positioning hole portion into which the positioning portion is inserted into either one of the end portion on the one axial side of the insulator and the flange portion. The bus bar includes a bus bar main body portion disposed on the placement surface portion, and a motor side terminal portion connected to one end side of the bus bar main body portion and bent and extended to one side in the axial direction and connected to the circuit board. Have
The holder main body portion has a terminal holding portion that protrudes from the placement surface portion to one axial side adjacent to the motor side terminal portion of the bus bar disposed on the placement surface portion,
The terminal holding part has a support part extending to the other side in the axial direction from the peripheral part of the holder main body part,
The motor according to claim 6, wherein the support portion has a stepped portion that contacts an end portion on one axial side of the resin housing. The motor according to claim 12, wherein a radially outer surface of the support portion includes a rib extending in an axial direction.

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