JP2019068555A - Busbar unit and motor - Google Patents

Abstract

A busbar unit that can be manufactured at low cost is provided. A busbar unit is provided above a stator which is annularly arranged around a central axis extending in a vertical direction. The bus bar unit is sandwiched between the first holder member 61, the second holder member 62 located above the first holder member, and the first holder member and the second holder member in the axial direction. And a bus bar 70 connected to a coil wire extending from the stator. Either the first holder member or the second holder member has a protrusion 67 protruding to the other side along the axial direction. The bus bar is provided with a through hole 70h into which the protrusion is inserted. [Selection diagram] FIG.

Description

  The present invention relates to a bus bar unit and a motor.

  Patent Document 1 discloses a motor having an arrangement member provided with a groove for arranging a coil wire drawn from a coil. In such a structure, the number of steps for arranging the coil wire is increased, which causes a problem of cost increase.

JP, 2010-154701, A

  For this reason, the present inventors are advancing adoption of the bus-bar unit which made the resin hold | maintain the several bus-bar which connects the coil wire and external connection terminal of a motor to resin. The bus bar unit has a plurality of bus bars and a resin bus bar holder for holding the plurality of bus bars. The plurality of bus bars are respectively fixed to the bus bar holder by, for example, heat caulking. In this case, since thermal caulking is provided for each bus bar, the number of bus bars increases, and the number of thermal caulking also increases, resulting in a problem of an increase in manufacturing cost.

  An object of one embodiment of the present invention is to provide a busbar unit that can be manufactured inexpensively.

  According to one aspect of the present invention, the bus bar unit is provided on the upper side of the stator annularly disposed around a central axis extending in the vertical direction. The bus bar unit is sandwiched between the first holder member, the second holder member located above the first holder member, and the first holder member and the second holder member in the axial direction. And a bus bar. The bus bar is connected to a coil wire extending from the stator. Any one of the first holder member and the second holder member has a protrusion that protrudes to the other side along the axial direction. The bus bar is provided with a through hole into which the protrusion is inserted.

  According to an aspect of the present invention, there is provided a bus bar unit that can be manufactured inexpensively by a manufacturing process.

FIG. 1 is a cross-sectional view of a motor according to one embodiment. FIG. 2 is an exploded perspective view of the bus bar unit of one embodiment. FIG. 3 is a perspective view of a fixing pin (protrusion) of one embodiment. FIG. 4 is a cross-sectional view of a fixing pin (protrusion) and a bus bar of one embodiment. FIG. 5 is a partial cross-sectional view of the bus bar unit showing a bent portion according to one embodiment. FIG. 6 is a partial cross-sectional view of the bus bar unit showing a bent portion according to one embodiment. FIG. 7 is a partial perspective view of the bus bar unit of the modification. FIG. 8 is a partial cross-sectional view of a bus bar unit of a modification. FIG. 9 is a schematic view of an electric power steering apparatus according to an embodiment.

  Hereinafter, a motor 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.

  In each figure, the Z axis is shown as appropriate. The Z-axis direction of each drawing is a direction parallel to the axial direction of the central axis J shown in FIG. In the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side) in the Z-axis direction is referred to as "lower side". Note that the upper and lower sides are directions used merely for the purpose of explanation, and do not limit the actual positional relationship or direction. Further, unless otherwise noted, a direction (Z-axis direction) parallel to the central axis J is simply referred to as “axial direction” or “vertical direction”, and a radial direction centered on the central axis J is simply referred to as “radial direction”. The circumferential direction around the central axis J, that is, around the axis of the central axis J, is simply referred to as “circumferential direction”. Furthermore, in the following description, “plan view” means a state viewed from the axial direction.

<Motor>
FIG. 1 is a cross-sectional view of a motor 10 of the present embodiment.
The motor 10 according to the present embodiment includes a rotor 30, a stator 40, a housing 20, a bearing holder 50, an upper bearing 6A, a lower bearing 6B, and a bus bar unit 60.

The rotor 30 rotates around a central axis J extending in the vertical direction. The rotor 30 has a shaft 31, a rotor core 32, and a rotor magnet 33.
The shaft 31 is disposed along the central axis J around a central axis J extending in the vertical direction (axial direction). The shaft 31 is rotatably supported around the central axis J by the upper bearing 6A and the lower bearing 6B. The rotor core 32 is fixed to the outer peripheral surface of the shaft 31. The rotor magnet 33 is fixed to the outer peripheral surface of the rotor core 32.

  The stator 40 is annularly disposed around the central axis J. The stator 40 surrounds the radially outer side of the rotor 30. The stator 40 faces the rotor 30 in the radial direction via a gap. The stator 40 has an annular stator core 41, an insulator 42 mounted on the stator core 41, and a coil 43 mounted on the stator core 41 via the insulator 42. The stator core 41 has teeth portions (not shown). The coil 43 is configured by winding a coil wire 43a. The coil wire 43 a is wound around the teeth portion of the stator core 41 via the insulator 42. The end of the coil wire 43 a is drawn upward and connected to the bus bar unit 60.

  The housing 20 is in the form of a tube that opens to the upper side (+ Z side). The housing 20 accommodates the rotor 30, the stator 40, the bearing holder 50 and the bus bar unit 60. The housing 20 has a tubular portion 25 and a bottom portion 29.

  The cylindrical portion 25 surrounds the stator 40 from the radially outer side. In the present embodiment, the cylindrical portion 25 is cylindrical with the central axis J as a center. The bottom portion 29 is located at the lower end of the cylindrical portion 25. A lower bearing holding portion 28 is provided at the center of the bottom portion 29 in plan view. The housing 20 holds the lower bearing 6B in the lower bearing holding portion 28.

  The bearing holder 50 is located on the upper side (+ Z side) of the stator 40. Also, the bearing holder 50 is located below the bus bar unit 60. That is, the bearing holder 50 is located between the stator 40 and the bus bar unit 60 in the axial direction. The planar view (XY plane) shape of the bearing holder 50 is, for example, a circular shape concentric with the central axis J. The bearing holder 50 is held by the cylindrical portion 25 of the housing 20 at the outer edge. An upper bearing holding portion 58 is provided at the center of the bearing holder 50 in plan view. The bearing holder 50 holds the upper bearing 6A at the upper bearing holding portion 58.

  The bearing holder 50 is provided with a first coil wire passage hole 51 penetrating in the axial direction. The coil wire 43a drawn from the stator 40 passes through the first coil wire passage hole 51 and is drawn upward.

<Bus bar unit>
The plan view shape of the bus bar unit 60 is a substantially circular shape that expands in the radial direction. The bus bar unit 60 is disposed on the upper side of the stator 40 and the bearing holder 50. The bus bar unit 60 is fixed to the upper surface of the bearing holder 50, for example.

FIG. 2 is an exploded perspective view of the bus bar unit 60. As shown in FIG.
The bus bar unit 60 includes five bus bars 70 (first bus bar 71, second bus bar 72, third bus bar 73, fourth bus bar 74, fifth bus bar 75), and a bus bar holder (first holder member) 61. And a cover member (second holder member) 62.

(Busbar holder (first holder member))
The bus bar holder 61 holds five bus bars 70. The bus bar holder 61 extends in a plate shape along the direction orthogonal to the axial direction. The lower surface of the bus bar holder 61 contacts the upper surface of the bearing holder 50. The bus bar holder 61 is made of, for example, an insulating material such as resin.

  The bus bar holder 61 has an upper surface 61 a facing upward. The bus bar holder 61 supports the five bus bars 70 from the lower side on the upper surface 61 a. The upper surface 61a is provided with a plurality of grooves 61d. The different bus bars 70 are accommodated in the grooves 61 d. Thereby, positional deviation of the bus bar 70 with respect to the bus bar holder 61 is suppressed in the direction orthogonal to the axial direction.

  A plurality of fixing pins (projections) 67 are provided on the upper surface 61 a of the bus bar holder 61. That is, the bus bar holder 61 has a plurality of fixing pins 67. The fixing pin 67 is located inside the groove 61 d when viewed in the axial direction. The fixing pin 67 protrudes from the bus bar holder 61 in the axial direction toward the cover member 62 (ie, the upper side). On the other hand, the five bus bars 70 are provided with a plurality of through holes 70 h penetrating in the vertical direction. The fixing pins 67 are inserted into the through holes 70 h of the respective bus bars 70.

FIG. 3 is a perspective view of the fixing pin 67. FIG.
The fixing pin 67 has a columnar portion 67a and a plurality of (four in the present embodiment) ribs 67c. Further, on the upper surface 61 a of the bus bar holder 61 around the fixing pin 67, a recessed portion 61 c recessed downward is provided. In the present embodiment, the recess 61c is provided on the bottom surface of the groove 61d provided on the upper surface 61a. The fixing pin 67 is located inside the recess 61 c when viewed in the axial direction.

  The columnar portion 67a extends in the vertical direction along a columnar portion axis O1 extending in the vertical direction. In the present embodiment, the columnar portion 67a is in the shape of a cylinder centered on the columnar portion axis O1. The columnar portion 67a passes through the through hole 70h. The tip of the columnar portion 67 a is located on the upper side of the bus bar 70 in a state where the fixing pin 67 is inserted into the through hole 70 h of the bus bar 70.

  The rib 67c is provided on the outer peripheral surface of the columnar portion 67a. The rib 67c protrudes in the direction away from the columnar part axis O1. The rib 67c extends in the vertical direction. In the present embodiment, the rib 67 c is in the shape of a vertically elongated prism. The rib 67c extends from the bottom of the recess 61c to near the tip of the columnar portion 67a. The plurality of ribs 67c are arranged at equal intervals around the columnar part axis O1 (that is, the axis of the columnar part 67a). The diameter of the circle connecting the radial tips of the plurality of ribs 67c around the columnar portion axis O1 is larger than the diameter of the through hole 70h of the bus bar 70.

FIG. 4 is a cross-sectional view of fixing pin 67 and bus bar 70.
The fixing pin 67 is press-fit into the through hole 70 h. In FIG. 4, an outline shown by a two-dot chain line is an outline of the rib 67 c of the fixing pin 67 before being press-fitted into the through hole 70 h. As shown by the solid line in FIG. 4, in a state where the fixing pin 67 is press-fit into the through hole 70 h, each rib 67 c is elastically deformed radially inward about the columnar portion axis O 1. A force is applied to the rib 67c in a direction from the inner circumferential surface of the through hole 70h toward the columnar portion 67a. A gap is provided between the portion of the outer peripheral surface of the columnar portion 67a where the rib 67c is not provided and the inner peripheral surface of the through hole 70h in the radial direction.

  According to the present embodiment, the plurality of bus bars 70 are provided with the through holes 70 h into which the fixing pins 67 provided on the bus bar holder 61 are inserted. Thereby, the plurality of bus bars 70 can be easily positioned on the bus bar holder 61. In addition, according to the present embodiment, the plurality of ribs 67c provided on the fixing pin 67 respectively contact the inner peripheral surface of the through hole 70h. Therefore, the bus bar 70 does not rattle with the bus bar holder 61, and the positioning accuracy of the bus bar 70 can be enhanced.

  When the fixing pin 67 is press-fit into the through hole 70 h, a part of the rib 67 c which is elastically deformed may be scraped and dropped to the upper surface 61 a of the bus bar holder 61. If a part of the cut rib 67c is sandwiched between the bus bar holder 61 and the bus bar 70, the bus bar 70 may be lifted. On the other hand, in the upper surface 61a of the bus bar holder 61 of the present embodiment, since the recess 61c is provided around the fixing pin 67, a part of the cut rib 67c falls into the recess 61c. Thus, the bus bar 70 can be suppressed from being lifted by a part of the cut rib 67 c.

  As shown in FIG. 2, the upper surface 61 a of the bus bar holder 61 is provided with a plurality of (three in the present embodiment) terminal holding portions 68 protruding upward. That is, the bus bar holder 61 has a terminal holding portion 68. The terminal holding portion 68 supports the external connection terminal 77 of the bus bar 70.

The bus bar holder 61 is provided with a first shaft passage hole 61 h penetrating the bus bar holder 61 in the vertical direction and a plurality of second coil wire passage holes 61 i.
The first shaft passage hole 61 h is located at the center of the bus bar holder 61 in plan view. The plan view shape of the first shaft passage hole 61 h is a circle centered on the central axis J. As shown in FIG. 1, the shaft 31 is passed through the first shaft passage hole 61 h.
A plurality of second coil wire passage holes 61i are provided along the circumferential direction. The plan view shape of the second coil wire passage hole 61i is circular. The coil wire 43a drawn from the coil 43 is passed through the second coil wire passage hole 61i.

(Bus bar)
The five bus bars 70 are plate-shaped. Five bus bars 70 are connected to coil wire 43 a extending from stator 40. As shown in FIG. 1, the coil wire 43 a passes through the first coil wire passage hole 51 of the bearing holder 50 and the second coil wire passage hole 61 i of the bus bar holder 61, and is drawn above the bus bar holder 61.

As shown in FIG. 2, the five bus bars 70 include three phase bus bars (first bus bar 71, second bus bar 72, and third bus bar 73) and two neutral point bus bars (fourth bus bars 74, fifth). And the bus bar 75). In the motor 10, the plurality of coils 43 are star-connected by these bus bars 70 to form a three-phase circuit.
The plurality of coils 43 may constitute a plurality of connection systems. As a result, even if a failure occurs in any of the connection systems, current can be supplied to the motor 10. The plurality of connection systems are constituted by a three-phase circuit in which the coils 43 included in each are connected by star connection.

  The first bus bar 71 includes a bus bar main body 71 a, two coil connection parts 76, an external connection terminal 77, and a bent part 79. Similarly, the second bus bar 72 includes a bus bar main body portion 72 a, two coil connection portions 76, an external connection terminal 77, and a bent portion 79. In addition, the third bus bar 73 includes a bus bar main body 73 a, two coil connection parts 76, an external connection terminal 77, and a bent part 79.

  The bus bar main body portions 71a, 72a, 73a of the first bus bar 71, the second bus bar 72, and the third bus bar 73 extend in the direction perpendicular to the vertical direction. The plate surfaces of the bus bar main body portions 71a, 72a, 73a are orthogonal to the vertical direction. That is, the first bus bar 71, the second bus bar 72, and the third bus bar 73 are flat type bus bars. The first bus bar 71, the second bus bar 72, and the third bus bar 73 are arranged such that the thickness direction of the bus bar main portions 71a, 72a, 73a is the axial direction. The bus bar main body portions 71 a, 72 a, 73 b are accommodated in the groove portions 61 d of the bus bar holder 61. Through holes 70 h into which fixing pins 67 of bus bar holder 61 are inserted are provided in bus bar main body portion 71 a. The bus bar main body portions 71a, 72a, 73a are sandwiched between the bus bar holder 61 and the cover member 62 in the axial direction. That is, the first bus bar 71, the second bus bar 72, and the third bus bar 73 are sandwiched between the bus bar holder 61 and the cover member 62 in the bus bar main portions 71a, 72a, 73a.

The bus bar main body portion 71 a of the first bus bar 71 has a first portion 71 b and a second portion 71 c.
The first portion 71b extends linearly along the circumferential direction. The first portion 71 b has a first end 71 ba and a second end 71 bb located at both ends in the circumferential direction. The first end 71 ba of the first portion 71 b is connected to the external connection terminal 77.
The second portion 71c extends radially inward from the second end 71bb of the first portion 71b. In the first bus bar 71, the second portion 71c bifurcates as it extends radially inward, and is connected to the coil connection portion 76 at the tip of the branch destination. That is, two coil connection parts 76 are connected to the second portion 71c.

The bus bar main body portion 72a of the second bus bar 72 has a first portion 72b and a second portion 72c.
The first portion 72b linearly extends along the circumferential direction. The first portion 72b has a first end 72ba and a second end 72bb located at both ends in the circumferential direction. The first end 72 ba of the first portion 72 b is connected to the external connection terminal 77.
The second portion 72c extends radially inward from the second end 72bb of the first portion 72b. Two coil connection parts 76 are connected to the second portion 72c.

The bus bar main body portion 73a of the third bus bar 73 has a first portion 73b and a second portion 73c.
The first portion 73b linearly extends along the circumferential direction. The first portion 73 b has a first end 73 ba and a second end 73 bb located at both ends in the circumferential direction. The first end 73 ba of the first portion 73 b is connected to the external connection terminal 77.
The second portion 73c extends radially inward from the second end 73bb of the first portion 73b. Two coil connection parts 76 are connected to the second portion 73c. A bridge portion 78 straddling the first bus bar 71 and the second bus bar 72 is provided in the second portion 73 c. The bridge portion 78 includes a rising portion 78a extending upward from the upper surface 61a of the bus bar holder 61, an intermediate portion 78b extending from the upper end of the rising portion 78a along the upper surface 61a, and a downward direction from the end of the intermediate portion 78b. And a falling portion 78c. The third bus bar 73 axially overlaps the first bus bar 71 and the second bus bar 72 in the middle portion 78 b of the bridge portion 78.

  In the first bus bar 71, the second bus bar 72, and the third bus bar 73, bending portions 79 are connected in the vicinity of the boundaries between the first portions 71b, 72b, 73b and the second portions 71c, 72c, 73c, respectively. Ru. A through hole 70h into which the fixing pin 67 is inserted is provided at the boundary between the first portion 71b, 72b, 73b and the second portion 71c, 72c, 73c located at the root of the bent portion 79. That is, the through holes 70h are provided at the roots from which the bent portions 79 of the bus bar main portions 71a, 72a, 73a extend.

  The bending portion 79 is provided to each of the first bus bar 71, the second bus bar 72, and the third bus bar 73. That is, three bent portions 79 are provided in the bus bar unit 60 of the present embodiment. In bus bar unit 60, three bent portions 79 are arranged at equal intervals along the circumferential direction. The three bent portions 79 extend upward from the bus bar main body portions 71a, 72a, 73a.

  A pair of fixing pieces 79 a which are bifurcated and extend upward are provided at the tip (upper end in the present embodiment) of the bent portion 79. As will be described later, as shown in FIG. 5, the pair of fixing pieces 79 a constitutes the caulking portion 7 and fixes the first bus bar 71, the second bus bar 72 and the third bus bar 73 to the cover member 62. Further, as described above, the first bus bar 71, the second bus bar 72, and the third bus bar 73 are fixed to the bus bar holder 61 by the fixing pins 67. Therefore, cover member 62 is fixed to bus bar holder 61 via first bus bar 71, second bus bar 72 and third bus bar 73.

  The external connection terminal 77 is provided to each of the first bus bar 71, the second bus bar 72, and the third bus bar 73. That is, in the present embodiment, three external connection terminals 77 are provided. The three external connection terminals 77 extend upward from each of the bus bar main body portions 71a, 72a, 73a. The plate surface of the external connection terminal 77 is orthogonal to the circumferential direction. The upper end of the external connection terminal 77 is electrically connected to a control device (not shown). The three external connection terminals 77 are arranged at equal intervals along the circumferential direction.

  The fourth bus bar 74 has a bus bar main body 74 a and three coil connection parts 76. Similarly, the fifth bus bar 75 has a bus bar main body portion 75 a and three coil connection portions 76. The fourth bus bar 74 and the fifth bus bar 75 are disposed on the opposite side of the central axis J in the radial direction. In the present embodiment, the shape of the fourth bus bar 74 and the shape of the fifth bus bar 75 are the same. The fourth bus bar 74 and the fifth bus bar 75 are arranged point-symmetrically with respect to the central axis J in plan view.

  The bus bar main body portions 74a and 75a of the fourth bus bar 74 and the fifth bus bar 75 are elongated plate-like shapes extending along a plane orthogonal to the vertical direction. That is, the fourth bus bar 74 and the fifth bus bar 75 are flat type bus bars. The fourth bus bar 74 and the fifth bus bar 75 are arranged such that the thickness direction of the bus bar main portions 74 a and 75 a is the axial direction. The plate surfaces of the bus bar main body portions 74a and 75a are orthogonal to the vertical direction. The fourth bus bar 74 and the fifth bus bar 75 are supported by the bus bar holder 61 with the plate surfaces directed vertically. Through holes 70 h into which fixing pins 67 are inserted are provided in the bus bar main body portions 74 a and 75 a. The fourth bus bar 74 and the fifth bus bar 75 are sandwiched between the bus bar holder 61 and the cover member 62 in the bus bar main portions 74 a and 75 a.

  The bus bar main body portions 74a and 75a of the fourth bus bar 74 and the fifth bus bar 75 extend in a substantially arc shape along the circumferential direction on the radially inner side of the second coil wire passage hole 61i. The bus bar main body portions 74a and 75a branch in three directions from both end portions in the circumferential direction and the center portion in the circumferential direction, and extend right above the three second coil wire passage holes 61i.

  The coil connection portions 76 respectively provided to the first bus bar 71 to the fifth bus bar 75 are portions that hold the coil wire 43 a and are connected to the coil wire 43 a. In the bus bar unit 60 of the present embodiment, twelve coil connection portions 76 are provided. The twelve coil connection portions 76 are positioned immediately above the second coil wire passage holes 61i provided in the bus bar holder 61, respectively. That is, the coil connection portion 76 is disposed at a position overlapping the second coil wire passage hole 61i in plan view.

(Cover member (second holder))
The plan view shape of the cover member 62 is substantially circular expanding in the radial direction. The cover member 62 is located on the upper side (one side in the axial direction) of the bus bar holder 61. The cover member 62 is made of, for example, an insulating material such as a resin. The cover member 62 has a cover main body 62a, an inner cylindrical portion 62b, and an outer edge 62c.

  The cover main body 62a is circular in plan view, and extends in a plate shape in a direction orthogonal to the axial direction. The cover main body 62 a overlaps the bus bar holder 61 as viewed in the axial direction.

  As shown in FIG. 1, the inner cylindrical portion 62 b extends downward from the inner edge of a second shaft passage hole 62 h provided in the cover main portion 62 a. The inner cylindrical portion 62 b is a cylinder centered on the central axis J. The inner cylindrical portion 62 b surrounds the shaft 31 from the outer side in the radial direction. The inner cylindrical portion 62 b is fitted into the first shaft passage hole 61 h of the bus bar holder 61. Thereby, the cover member 62 is positioned in the radial direction with respect to the bus bar holder 61.

  The outer edge portion 62c extends downward from the outer edge of the cover main portion 62a. The outer edge portion 62c has a substantially cylindrical shape centering on the central axis J. The outer edge portion 62 c surrounds the bus bar 70 and the bus bar holder 61 from the radially outer side.

  As shown in FIG. 2, in the cover main body 62a, a second shaft passage hole 62h, three terminal passage holes 62i, three bent portion passage holes 64, three second recesses 66, and three A first recess (gripping recess) 63 is provided. That is, the cover member 62 is provided with a second shaft passage hole 62 h, three terminal passage holes 62 i, three bent portion passage holes 64, a second recess 66, and a first recess 63. The second shaft passage hole 62h, the terminal passage hole 62i, and the bent portion passage hole 64 penetrate the cover main body 62a in the axial direction. The second recess 66 and the first recess 63 are recessed downward on the upper surface of the cover body 62a.

  The second shaft passage hole 62h is located at the center of the cover main body 62a in a plan view. The plan view shape of the second shaft passage hole 62h is a circle centered on the central axis J. As shown in FIG. 1, the shaft 31 is passed through the second shaft passage hole 62 h.

  A plurality of three terminal passage holes 62i are provided along the circumferential direction. The three terminal passage holes 62i are arranged at equal intervals along the circumferential direction. The plan view shape of the three terminal passage holes 62i has a substantially rectangular shape whose short side is a side extending in a direction orthogonal to the radial direction. The external connection terminals 77 of the bus bar 70 and the terminal holding portions 68 of the bus bar holder 61 pass through the three terminal passage holes 62i.

  Three first concave portions 63 are provided in the cover main body 62a. The three first recesses 63 are arranged at equal intervals in the circumferential direction. The first recess 63 reaches the outer edge of the cover body 62a. Therefore, the first recess 63 opens upward and radially outward. In other words, the outer peripheral edge of the cover member 62 is provided with three first recesses 63 that are recessed inward in the radial direction.

  The tip of the chuck portion 5 of the assembling apparatus (or the assembling jig) for gripping the cover member 62 is inserted into the first recess 63 in the assembling process. The assembling device inserts the three chucks 5 into the first recess 63 respectively. Thereafter, the chuck portion 5 is moved in a direction approaching the central axis J, and the chuck portion 5 is brought into contact with the inner wall surface of the first concave portion 63 facing the radial direction. By bringing the chuck 5 into contact with the inner wall surface of the first recess 63, the cover member 62 is gripped. According to the present embodiment, by providing the first recess 63 in the cover member 62, the assembling apparatus can easily grip the cover member 62 in the assembly process. Further, by rotating the three chucks 5 around the central axis J, the circumferential alignment of the cover member 62 can be easily performed.

In the present embodiment, the plan view shape of one first recess 63 among the three first recesses 63 is different from the plan view shape of the other two first recesses 63. More specifically, the plan view shape of one first concave portion 63 among the three first concave portions 63 is a rectangular shape whose one side is a direction orthogonal to the radial direction. Moreover, the planar view shape of other two 1st recessed parts 63 among three 1st recessed parts 63 is a semicircle shape dented in a radial inside. The first concave portion 63 having a rectangular shape in a plan view functions as a mark at the time of performing positioning of the cover member 62 in the circumferential direction. Further, by making the shapes of the three chuck portions 5 conform to the shapes of the respective first concave portions 63, when the cover member 62 is gripped by the assembling apparatus, the positions deviated by 120 ° in the circumferential direction Can be prevented from being gripped by
In addition, in this embodiment, the cover member 62 in which the three 1st recessed parts 63 were provided was illustrated. However, the number of first recesses 63 is not limited as long as a plurality of first recesses 63 are provided in cover member 62. In addition, although it has been described that the planar view shape of one first concave portion 63 among the three first concave portions 63 is different from the planar view shape of the other two first concave portions 63, the planar surface of the three first concave portions 63 The visual shapes may all be the same. In that case, a mark may be provided in the vicinity of any one first recess 63 when the circumferential alignment of the cover member 62 is performed.

  Three second concave portions 66 are provided in the cover main body 62a. The three second recesses 66 are equally spaced in the circumferential direction. The second recess 66 reaches the outer edge of the cover body 62a. Thus, the second recess 66 opens upward and radially outward. The second recess 66 has a bottom surface 66 a facing upward. The bottom surface 66 a is a part of the top surface of the cover member 62.

  Three bending portion passage holes 64 are provided along the circumferential direction. Each bent portion passage hole 64 is located at the bottom surface 66 a of the second recess 66 which is different among the three second recesses 66. The three terminal passage holes 62i are arranged at equal intervals along the circumferential direction. The plan view shape of the bending portion passage hole 64 is a rectangular shape. The bent portion 79 of the bus bar 70 passes through the bent portion passage hole 64.

  In addition, a holding portion 65 is provided around the bending portion passage hole 64. That is, the cover member 62 has the holding portion 65. The holding portion 65 has a pair of holding protrusions 65 a. The holding projection 65 a protrudes upward from the bottom surface 66 a of the second recess 66. The holding projection 65 a is rectangular in plan view. One side of the holding projection 65 a in plan view coincides with one side of the rectangular bending portion passage hole 64. The pair of holding projections 65 a are arranged to sandwich the bending portion passage hole 64 when viewed in the axial direction. Further, the pair of holding protrusions 65 a is disposed to sandwich the bending portion 79 passing through the bending portion passage hole 64 in one direction orthogonal to the axial direction. The holding projection 65 a has an inclined surface 65 b which is separated from the bending portion passage hole 64 as it goes upward. That is, the cover member 62 is provided with a pair of inclined surfaces 65 b. The inclined surface 65 b is a part of the upper surface of the cover member 62.

FIG. 5 is a cross-sectional view of the bus bar unit 60 showing the bending portion 79 inserted into the bending portion passage hole 64. As shown in FIG. FIG. 5 is a cross-sectional view taken along a cross-sectional line parallel to the plate surface of the bent portion 79. As shown in FIG.
As shown in FIG. 5, the tip of the bent portion 79 is located above the upper surface of the cover member 62. The pair of fixing pieces 79 a provided at the tip of the bent portion 79 is crimped after the cover member 62 is mounted on the upper side of the bus bar holder 61. More specifically, a caulking jig 4 having a V-shaped tip 4a is prepared, and the tip 4a is brought close from the upper side of the bent portion 79 and inserted between the pair of fixing pieces 79a, and further, the lower side. In this case, the pair of fixing pieces 79a are turned away from each other until they contact the inclined surface 65b. As a result, the crimped portion 7 is formed at the tip of the bent portion 79. That is, the crimped portion 7 is provided at the tip of the bent portion 79. The caulking portion 7 also has a pair of fixing pieces 79a.

  The tip of the fixing piece 79 a opens wider than the width of the bending portion passage hole 64. That is, viewed in the axial direction, at least a part of the caulking portion 7 reaches the outside of the bending portion passage hole 64. The portion of the crimped portion 7 that reaches the outside of the bent portion passage hole 64 suppresses the cover member 62 from moving upward with respect to the bus bar 70.

  Further, the caulking portion 7 contacts the inclined surface 65 b which is a part of the upper surface of the cover member 62 at a portion positioned outside the bending portion passage hole 64 when viewed in the axial direction. Further, as described later, the bus bar 70 has a portion in contact with the lower surface of the cover member 62. Accordingly, the bus bar 70 contacts the surface of the cover member 62 facing upward and the surface of the cover member 62 facing downward. Thus, rattling of the cover member 62 with respect to the bus bar 70 is suppressed.

  According to the present embodiment, the inclined surface 65b in contact with the caulking portion 7 extends along the inclination direction of the fixing piece 79a and contacts the fixing piece 79a. As a result, a large contact area between the caulking portion 7 and the cover member 62 can be secured, and the reliability of fixing the bus bar 70 and the cover member 62 can be enhanced.

  According to the present embodiment, the caulking portion 7 is constituted by a pair of fixing pieces 79 a located at the tip of the bending portion 79 and divided into two. Further, the pair of fixing pieces 79 a inclines in the direction of being separated from each other as it goes to the tip of the bending portion 79. Such a crimped portion 7 can be easily formed by a crimping jig 4 having a V-shaped tip 4a. That is, according to the present embodiment, the crimping process can be simplified, and the cost required for the assembling process can be compressed.

FIG. 6 is a cross-sectional view of bus bar unit 60 showing bent portion 79 inserted into bent portion passage hole 64. As shown in FIG. FIG. 6 is a cross-sectional view taken along a cross-sectional line orthogonal to the plate surface of the bent portion 79. As shown in FIG.
As shown in FIG. 6, a through hole 70h is provided at the root from which the bent portion 79 of the bus bar main body 71a, 72a, 73a extends. The bus bar 70 is fixed to the bus bar holder 61 by inserting the fixing pin 67 into the through hole 70 h. By providing through hole 70 h at the root of bent portion 79, bent portion 79 can be stabilized relative to bus bar holder 61. As a result, rattling of the cover member 62 with respect to the bus bar holder 61 can be suppressed.

  On the surface facing the lower side of the cover member 62, an accommodation recess 69 in which the fixing pin 67 is accommodated is provided. The housing recess 69 surrounds the fixing pin 67. The cover member 62 contacts the bus bar 70 around the accommodation recess 69. Therefore, the cover member 62 contacts the bus bar 70 around the through hole 70 h. Similarly, the bus bar holder 61 contacts the bus bar 70 around the through hole 70 h. That is, the bus bar holder 61 and the cover member 62 contact the bus bar 70 in the vertical direction around the through hole 70 h to sandwich the bus bar 70. Therefore, rattling of the bus bar 70 in the axial direction and the radial direction around the through hole 70 h is suppressed. In addition, according to the present embodiment, the bus bar holder 61 and the cover member 62 sandwich the bus bar 70 from above and below at the root of the bent portion 79. Therefore, the bent portion 79 is stabilized, and the stability of the fixation between the bus bar 70 and the cover member 62 in the caulking portion 7 located at the tip of the bent portion 79 is enhanced.

  According to the present embodiment, the plurality of bus bars 70 are fixed by being pinched by the bus bar holder 61 and the cover member 62. Therefore, it is not necessary to individually fix the plurality of bus bars 70 using a structure such as thermal caulking. Therefore, the assembling process can be simplified as compared with the case where the plurality of bus bars 70 are individually fixed.

  In addition, as shown in FIG. 2, the case where the fixing pin 67 is provided in the bus-bar holder 61 was illustrated in this embodiment. However, the fixing pin 67 may be provided on the cover member 62. That is, any one of the bus bar holder 61 and the cover member 62 may have the fixing pin 67 projecting in the other direction along the axial direction.

  Further, in the present embodiment, the case where the bending portion passage hole 64 is provided in the cover member 62 and the bending portion 79 extends upward and passes through the bending portion passage hole 64 is exemplified. However, the bent portion passage hole 64 may be provided in the bus bar holder 61, and the bent portion 79 may extend downward and pass through the bent portion passage hole 64. That is, the bus bar 70 has a bending portion 79 extending in one side in the axial direction, and the bending portion passage hole 64 for passing the bending portion 79 is provided in either one of the bus bar holder 61 and the cover member 62. Just do it. In addition, the inclined surface 65 b may be provided on one of the bus bar holder 61 and the cover member 62 provided with the bending portion passage hole 64. In this case, it is preferable that the fixing pin 67 be provided on the cover member 62, and the cover member 62 and the bus bar 70 be fixed by the fixing pin 67.

[Modification]
7 and 8 show a bus bar unit 160 according to a modification. FIG. 7 is a perspective view showing a snap fit portion 190 for fixing the bus bar holder (first holder member) 161 and the cover member (second holder member) 162 in the bus bar unit 160 of this modification. FIG. 8 is a cross-sectional view of the snap fit portion 190 in the bus bar unit 160 of the present modification.

The bus bar unit 160 of the present modification is different from the bus bar unit 60 of the above-described embodiment mainly in that it has a snap fit portion 190 that fixes the bus bar holder 161 and the cover member 162 to each other.
In addition, about the component of the aspect same as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  A plurality of (three in the present modification) snap-fit parts 190 are provided on the bus bar unit 160. The plurality of snap fit portions 190 are arranged at equal intervals along the circumferential direction. In the present modification, the snap fit portion 190 is disposed in the vicinity of the external connection terminal 77 of the bus bar 70.

  The snap fit portion 190 is composed of a claw portion 191 provided in the bus bar holder 161 and a claw portion passage hole 196 provided in the cover member 162.

  As shown in FIG. 8, the bus bar holder 161 has a claw portion 191 extending upward. The claw portion 191 has a claw body portion 191a extending upward and a claw protrusion 191b extending radially outward at the upper end of the claw body portion 191a. The upper surface of the claw projection 191b is provided with a claw inclined surface 191c that is inclined downward toward the radially outer side.

  A third recess 162 d is provided on the top surface of the cover member 162. The third recess 162 d is recessed downward from the top surface of the cover member 162. The third recess 162 d reaches the outer edge of the cover member 162. Therefore, the third recess 162 d opens upward and radially outward. The claw portion passing hole 196 is provided on the bottom surface 162da of the third concave portion 162d. In addition, a stepped portion 162db is provided on the bottom surface 162da of the third concave portion 162d. The stepped portion 162db protrudes upward at the bottom surface 162da. The stepped portion 162 db is adjacent to the opening of the claw portion passing hole 196.

  The claw portion passage hole 196 penetrates the cover member 162 in the axial direction. The claw portion passage hole 196 is located inside the third concave portion 162 d provided in the cover member 162 as viewed in the axial direction. A tapered surface 196 a is provided on the inner peripheral surface of the claw portion passage hole 196. The tapered surface 196a is inclined radially inward as it goes upward. The tapered surface 196a overlaps the claw inclined surface 191c when viewed from the axial direction. The inclination angle of the tapered surface 196a and the inclination angle of the claw inclined surface 191c are substantially equal.

  The nail body 191 a passes through the nail passage hole 196. The upper end of the nail body portion 191a is located above the bottom surface 162da of the third recess 162d. The claw protrusion 191 b contacts the step portion 162 db on the upper side of the claw passage hole 196.

  In the assembling process, when the worker (or the assembling device) brings the cover member 162 close to the bus bar holder 161 in the axial direction, the inclined sloping surface 191 c first contacts the tapered surface 196 a of the claw passing hole 196. Furthermore, when the cover member 162 is moved, the claw inclined surface 191c slides relative to the tapered surface 196a, and the claw main body 191a elastically deforms inward in the radial direction. When the claw projection 191b reaches the upper side of the step 162db, the elastic deformation of the claw body 191a is released, and the claw projection 191b rides on the upper side of the step 162db. Thereby, the snap fit portion 190 fixes the bus bar holder 161 and the cover member 162 to each other.

  According to this modification, the bus bar holder 161 and the cover member 162 are fixed to each other by the snap fit portion 190. Further, similarly to the above-described embodiment, the bus bar 70 is vertically sandwiched by the bus bar holder 161 and the cover member 162. Therefore, the plurality of bus bars 70 can be fixed to the bus bar holder 161 without fixing the plurality of bus bars 70 individually.

In the present modification, the bus bar 70 and the cover member 162 may not be fixed by the caulking portion 7 (see FIG. 5) of the bus bar 70.
In the above embodiment, the bus bar holder 61 and the cover member 62 are fixed via the bus bar 70.
On the other hand, in the present modification, the bus bar holder 161 and the cover member 162 are directly fixed at the snap fit portion 190. Also, the bus bar 70 is fixed by being sandwiched between the bus bar holder 161 and the cover member 162. Therefore, the bus bar 70 may not be directly fixed to the bus bar holder 161. In addition, the bus bar 70 may not be directly fixed to the cover member 162.

<Electric power steering device>
Next, an embodiment of a device on which the motor 10 of one embodiment is mounted will be described.
FIG. 9 is a schematic view of an electric power steering apparatus 2 on which the motor 10 of the present embodiment is mounted. The electric power steering device 2 is mounted on a steering mechanism of a wheel 212 of a car. The electric power steering device 2 is a device that reduces the steering force by hydraulic pressure. The electric power steering apparatus 2 includes a motor 10, a steering shaft 214, an oil pump 216, and a control valve 217.

The steering shaft 214 transmits an input from the steering 211 to an axle 213 having wheels 212. The oil pump 216 generates hydraulic pressure in a power cylinder 215 that transmits hydraulic driving force to the axle 213. The control valve 217 controls the oil of the oil pump 216. In the electric power steering device 2, the motor 10 is mounted as a drive source of the oil pump 216.
The motor 10 of the present embodiment is not limited to the electric power steering device 2 and may be mounted on any device.

  Although one embodiment and its modification of the present invention were explained above, each composition and combination of those in one embodiment and its modification are an example, and it is composition within the range which does not deviate from the meaning of the present invention. Additions, omissions, substitutions and other modifications are possible. Further, the present invention is not limited by the embodiments.

  For example, in the above-described embodiment, the case where the bus bar 70 is a flat type bus bar disposed with the axial direction as the thickness direction has been described. However, the bus bar 70 may be a vertically mounted bus bar disposed with the direction orthogonal to the axial direction as the thickness direction.

  Moreover, in the above-mentioned embodiment, the case where the bus-bar unit 60 was arrange | positioned above the bearing holder 50 was demonstrated. However, the bus bar unit 60 may be disposed between the bearing holder 50 and the stator 40 in the axial direction.

  Furthermore, in the above-described embodiment, the case where the fixing pin 67 is provided with a plurality of ribs 67c has been described. However, the fixing pin 67 may not be provided with the plurality of ribs 67 c.

7 caulking portion 10 motor 30 rotor 40 stator 43 coil 43a coil wire 60, 160 busbar unit 61, busbar holder (first holder member) 62, 162 ... cover member (second holder member), 63 ... first recess (gripping recess), 64 ... bent portion passage hole, 65b ... inclined surface, 67 ... fixing pin (projection), 67a ... columnar portion, 67c ... Rib, 70 ... bus bar, 70 h ... through hole, 71a, 72a, 73a, 74a, 75a ... bus bar main part, 76 ... coil connection part, 79 ... bent part, 79a ... fixed piece, 190 ... snap fit part, J ... Central axis

Claims (10)

A bus bar unit provided on an upper side of a stator annularly disposed around a vertically extending central axis, the bus bar unit comprising:
A first holder member,
A second holder member located above the first holder member;
A bus bar interposed in the axial direction between the first holder member and the second holder member and connected to a coil wire extending from the stator;
Any one of the first holder member and the second holder member has a protrusion that protrudes to the other side along the axial direction,
The bus bar is provided with a through hole into which the protrusion is inserted.
Bus bar unit. The first holder member and the second holder member contact the bus bar in the vertical direction around the through hole.
The bus bar unit according to claim 1. The protrusion is
A columnar portion extending in the vertical direction and passing through the through hole;
And a plurality of ribs protruding from the outer peripheral surface of the columnar part and spaced apart from each other around the axis of the columnar part,
The plurality of ribs contact the inner circumferential surface of the through hole, respectively.
The bus bar unit according to claim 1 or 2. The bus bar is
A bus bar main body extending in a direction orthogonal to the axial direction and sandwiched between the first holder member and the second holder member;
A coil connection portion connected to the coil wire;
And a bent portion extending in the axial direction from the bus bar main body portion,
A bent portion passage hole is provided in any one of the first holder member and the second holder member so as to penetrate in the axial direction and pass the bent portion.
The tip of the bent portion is provided with a crimped portion at least a part of which reaches the outside of the bent portion passage hole as viewed in the axial direction.
The bus bar unit according to any one of claims 1 to 3. The through hole is provided at a base where the bent portion of the bus bar main body portion extends.
The bus bar unit according to claim 4. The caulking portion has a pair of bifurcated fixing pieces located at the tip of the bent portion,
The pair of fixing pieces are inclined in a direction away from each other toward the tip of the bent portion.
The bus bar unit according to claim 4 or 5. Among the first holder member and the second holder member, one of the first holder member and the second holder member provided with the bent portion passage hole is provided with a pair of inclined surfaces that contact the fixing piece, respectively.
The pair of inclined surfaces extends along the inclination direction of the pair of fixing pieces.
The bus bar unit according to claim 6. The first holder member and the second holder member are fixed to each other by a snap fit portion.
The bus bar unit according to any one of claims 1 to 7. At least one outer peripheral edge of the first holder member and the second holder member is provided with a plurality of gripping recesses that are recessed radially inward.
The bus bar unit according to any one of claims 1 to 8. A motor comprising the bus bar unit according to any one of claims 1 to 9,
Said stator,
And a rotor radially opposed to the stator via a gap.
motor.

Images