JP7040452B2 - motor - Google Patents

Description

The present invention relates to a motor.

Conventionally, a through hole for drawing a coil wire or the like from the inside is provided in a motor housing or a partition wall. A bush of an insulating member is provided in the through hole in order to prevent the coil wire or the like from coming into contact with the housing (see, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 9-266651 Japanese Unexamined Patent Publication No. 9-215260 Japanese Unexamined Patent Publication No. 2012-223067

In Patent Documents 1 to 3, as the bush retaining structure, a structure in which flanges are provided at both ends of the bush or a structure in which the bush installed in the through hole of the motor is fixed with a fixing plate and a screw is adopted. However, the bush having a flange requires a large deformation of the flange at the time of mounting, which complicates the work. In addition, the structure using the fixing plate requires a large number of parts and man-hours for work, and the manufacturing cost also increases.

One aspect of the present invention is to provide a motor having improved bush mounting workability.

According to one aspect of the invention, the motor comprises an electrical element including at least one of a stator and a control board, a rotor disposed facing the stator, and a conductive material extending unilaterally from the electrical element. A housing for accommodating the electric element, a partition wall for accommodating the electric element together with the housing, and a plurality of the conductive materials provided in at least one through hole of the outer wall of the housing and the partition wall. The bush is an elastic member having a plurality of insertion holes into which the conductive material is inserted, and has a plurality of outer peripheral ribs arranged in the circumferential direction on the outer surface facing the through hole. The housing is a tubular member that houses the stator and the rotor, the partition wall is provided in the opening of the housing so as to cover the stator and the rotor, and the through hole is the partition wall of the partition wall. It is composed of a concave portion provided at the outer peripheral end and recessed in the radial direction and an inner surface surface of the housing .

According to one aspect of the present invention, the workability of attaching the bush that holds the conductive material in the motor is improved.

FIG. 1 is a cross-sectional view showing a motor of the embodiment. FIG. 2 is a perspective view of the motor. FIG. 3 is a plan view of the motor. FIG. 4 is an enlarged plan view of the bush. FIG. 5 is a cross-sectional view taken along the line I-I of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.



In the following description, the extending direction of the central axis J is the vertical direction. However, the vertical direction in the present specification is merely a name used for explanation, and does not limit the actual positional relationship or direction. Unless otherwise specified, the direction parallel to the central axis J is simply called "axial direction", the radial direction centered on the central axis J is simply called "diametric direction", and the circumference centered on the central axis J. The direction (around the central axis J) is simply called the "circumferential direction".

In addition, in the present specification, "extending in the axial direction" includes not only the case of extending in the strict axial direction but also the case of extending in a direction inclined in a range of less than 45 ° with respect to the axial direction. Further, in the present specification, "extending in the radial direction" means that in addition to the case where it extends in a strictly radial direction, that is, in a direction perpendicular to the axial direction, it is tilted in a range of less than 45 ° with respect to the radial direction. Including the case of extending in the vertical direction.

FIG. 1 is a cross-sectional view showing the motor 10 of the present embodiment. FIG. 2 is a perspective view of the motor 10. FIG. 3 is a plan view of the motor 10. FIG. 4 is an enlarged plan view of the bush. FIG. 5 is a cross-sectional view taken along the line I-I of FIG.

The motor 10 includes a housing 20, a rotor 30, a stator 40, a bearing holder (partition wall) 55, an upper bearing 51, a lower bearing 52, four bushes 75, and a control board 15. In the present embodiment, the control board 15 and the stator 40 form an electric element of the motor 10. The motor 10 may be configured not to include a control board as an electric element.

The housing 20 has a tubular portion 21 extending in the vertical direction, a bottom wall portion 23 located at the lower end of the tubular portion 21, and an opening 20a opening upward. The stator 40 and the bearing holder 55 are fixed to the inner peripheral surface of the housing 20 in this order from the lower side. The housing 20 houses the rotor 30 inside.

The tubular portion 21 has a cylindrical shape centered on the central axis J. The tubular portion 21 has an inner peripheral surface 20b for holding the stator 40 and an inner peripheral surface 20c for holding the bearing holder 55. The inner diameter of the inner peripheral surface 20c is larger than the inner diameter of the inner peripheral surface 20b. The inner diameter of the housing 20 decreases from the opening 20a toward the back side (bottom wall portion 23 side).



The shape of the tubular portion 21 is not limited to a cylindrical shape. The shape of the tubular portion 21 can be changed within a range in which the stator 40 and the bearing holder 55 can be held on the inner peripheral surface. The outer shape of the tubular portion 21 may be, for example, a box shape.

The bottom wall portion 23 is arranged below the stator 40. The bottom wall portion 23 has a cylindrical bearing holding portion 23a that holds the lower bearing 52, and an output shaft hole 22 that penetrates the bottom wall portion 23 in the axial direction.

The rotor 30 has a shaft 31. The shaft 31 is centered on a central axis J extending in the vertical direction. The rotor 30 rotates around the central axis J together with the shaft 31. The lower end of the shaft 31 passes through the output shaft hole 22 and projects downward to the housing 20. In the present embodiment, the control board 15 is located on the upper side, and the rotational movement of the motor 10 is output to the lower side. However, the structure may be such that the control board 15 is located on the lower side and the rotational motion of the motor 10 is output to the upper side.

The upper bearing 51 and the lower bearing 52 rotatably support the shaft 31 around a central axis. The lower bearing 52 is held by the bearing holding portion 23a on the lower side of the stator 40. The upper bearing 51 is held by the bearing holder 55 on the upper side of the stator 40.

The stator 40 is located radially outside the rotor 30. The stator 40 has a stator core 41, an insulator 42, and a coil 43. The insulator 42 is attached to the teeth 41a of the stator core 41. The coil 43 is composed of a conducting wire wound around the insulator 42 and is arranged in each tooth 41a. The outer peripheral surface of the stator 40 is fixed to the inner peripheral surface 20b of the housing 20.

As shown in FIGS. 1 to 3, the stator 40 has six coil leader wires 91 extending from the plurality of coils 43. The coil leader wire 91 is routed radially outward on the upper side of the stator 40. The coil leader wire 91 is bent upward in the axial direction on the outer peripheral portion of the stator 40 and is pulled out to the upper side of the bearing holder 55. Then, it is connected to the control board 15 located at the upper part of the bearing holder 55. That is, the stator 40 and the control board 15 overlap each other in the axial direction.

If the stator 40 and the control board 15 are connected, the coil leader wire 91 may be bent in one direction and then connected to the control board 15. The coil leader wire 91 passing through the bearing holder 55 is a conductive material extending from the electrical element of the motor 10. The conductive material is not limited to the coil leader wire 91, and may be, for example, wiring or a connector pin extending from the control board 15 housed in the housing 20.

The control board 15 may be housed in the housing 20, or may be housed in another housing such as an ECU cover. Even when the control board 15 is housed in another housing such as an ECU cover, the rotor 30, the stator 40, and the control board 15 can be housed by the housing 20 and the ECU cover.

The bearing holder 55 has a substantially disk shape and is arranged above the stator 40. The bearing holder 55 holds the upper bearing 51. The bearing holder 55 is fixed to the inner peripheral surface 20c of the housing 20. The bearing holder 55 is a partition wall that partitions the inside of the housing 20. The partition wall is not limited to the bearing holder 55 as long as it is a plate member that partitions the inside of the housing 20. For example, the partition wall may be a plate member that also serves as a bus bar holder or a heat sink. Further, the partition wall of the bearing holder 55 or the like is not limited to a substantially disk shape as long as it can be fixed to the inner peripheral surface of the housing 20, and may be a substantially square shape or the like. Further, when another housing such as an ECU cover is provided, the partition wall may be attached to the ECU cover or may be arranged between the ECU cover and the housing 20.

As shown in FIGS. 1 to 3, the bearing holder 55 has an inner cylinder portion 55a that holds the upper bearing 51 and four recesses 55b that allow the coil leader wire 91 to pass axially in the outer peripheral portion of the bearing holder 55. Have.

The recess 55b is a portion recessed inward in the radial direction at the outer peripheral end of the bearing holder 55. In the present embodiment, the two recesses 55b are arranged around the axis of the shaft 31 at equal intervals of 180 °. The recesses 55b are not limited to two, and may not be arranged at equal intervals.

The end surface on the outer peripheral side of the bearing holder 55 is fixed to the inner peripheral surface 20c of the housing 20 in the region excluding the recess 55b. The region surrounded by the recess 55b and the inner peripheral surface 20c is a through hole 60 that penetrates the bearing holder 55 in the axial direction. Three coil leader wires 91 are inserted into the through holes 60, respectively. The coil leader wire 91 is held by a bush 75 fitted in the through hole 60. Further, the planar shape of the through hole 60 in the top view is not limited to the illustrated shape, and can take various shapes such as a circle, an ellipse, a rectangle, and a polygon.

As shown in FIG. 4, in a plan view, the bush 75 has a shape extending substantially in the circumferential direction of the motor 10. The bush 75 is provided with three insertion holes 75A, 75B, and 75C that penetrate in the vertical direction (axial direction). A plurality of outer peripheral ribs 81 to 87 are provided on the outer surface of the bush 75. In FIGS. 4 and 5, one coil leader wire 91a to 91c is inserted into each of the three insertion holes 75A to 75C of the bush 75.

The bush 75 is an elastic member made of an elastomer such as rubber or urethane resin, or plastic. The bush 75 may be either composed of a material having rubber elasticity as a whole or a structure in which only the outer peripheral ribs 81 to 87 are made of a material having rubber elasticity.

By using the bush 75 as an elastic member, the bush 75 can be elastically deformed and fitted into the through hole 60 with a small force. This makes it possible to improve the workability of the operator when the bush 75 is attached.

The bush 75 may be an elastic member made of an insulating resin material. By using an insulating elastic member, the coil leader wire 91 can be reliably insulated from the metal housing 20 and the bearing holder 55.

The bush 75 has a shape elongated in the direction in which the three insertion holes 75A to 75C are lined up. The lateral direction of the bush 75 is a direction orthogonal to the longitudinal direction of the bush. The lateral direction of the bush 75 coincides with the radial direction of the motor 10. Specifically, the shape of the bush 75 may be a rectangle, an ellipse, or the like. The shape of the bush 75 may be a square or a circle, which is not a longitudinal shape.

The outer surface 75a located on the radial outer side of the bush 75 is a substantially cylindrical curved surface along the inner peripheral surface 20c of the housing 20. Three outer peripheral ribs 81, 82, and 83 are provided on the outer side surface 75a. The bush 75 has protrusions 77a and 77b protruding outward in the longitudinal direction at both ends in the longitudinal direction in a plan view. Outer peripheral ribs 84 and 85 are provided on the outer surface surface 75c) of one of the protruding portions 77a in the protruding direction. Outer peripheral ribs 86 and 87 are provided on the tip surface (outer surface 75d) of the other protruding portion 77b in the protruding direction.

Since the bush 75 has the outer peripheral ribs 81 to 87 on the outer surface, the bush 75 is fitted into the through hole 60 with at least the outer peripheral ribs 81 to 87 elastically deformed. As a result, an elastic force toward the outside of the bush 75 is applied to the inner surface of the through hole 60 as a reaction force of the force applied to the bush 75. That is, the bush 75 is in a state of continuously pushing the inner side surface (inner peripheral surface 20c and recess 55b) of the through hole 60. As a result, the bush 75 can be made difficult to come out from the through hole 60.

The outer peripheral ribs 81 to 87 extend in one direction (vertical direction, axial direction) on the outer surface of the bush 75. The upper ends of the outer peripheral ribs 81 to 87 reach the upper surface of the bush 75. The lower ends of the outer peripheral ribs 81 to 87 do not reach the lower surface of the bush 75 and are located on the outer surface of the bush 75.

By providing the outer peripheral ribs 81 to 87 only in a part of the bush 75 in the vertical direction in this way, the bush 75 can be fitted into the through hole 60 with a small force.

The outer peripheral ribs 81 to 87 are arranged apart from each other in the circumferential direction of the bush 75.

If an annular convex portion that goes around the outer surface of the bush 75 is provided, it becomes difficult to insert the bush 75 into the through hole 60. Further, since the bush 75 tends to tilt even in the through hole 60, there is a concern that it will be difficult to arrange the bush 75 at a predetermined position in the through hole 60. On the other hand, in the configuration of the present embodiment, there is a gap between adjacent outer peripheral ribs 81 to 87. Therefore, the bush 75 can be fitted into the through hole 60 in a state where an appropriate frictional force is generated between the bush 75 and the through hole 60. Therefore, the bush 75 can be easily inserted into the through hole 60, and the inclination of the bush 75 in the through hole 60 is also suppressed.

The outer peripheral ribs 81 to 83, 84, 86 and the insertion holes 75A to 75C are arranged so as to satisfy a specific positional relationship. Specifically, the insertion hole 75C and the outer peripheral ribs 83 and 86 will be described. The insertion hole 75C is arranged on a straight line L1 that passes through the outer peripheral rib 83 and extends in a direction in which the outer peripheral rib 83 protrudes from the outer surface 75a of the bush 75. Will be done. Further, the insertion hole 75C is arranged on the straight line L2 that passes through the outer peripheral rib 86 and extends in the direction in which the outer peripheral rib 86 protrudes from the outer surface 75d. The positional relationship between the outer peripheral ribs 81 and 84 and the insertion hole 75A, and the positional relationship between the outer peripheral rib 82 and the insertion hole 75B are the same as the positional relationship between the outer peripheral ribs 83 and 86 and the insertion hole 75C.

According to the above configuration, the elastic force due to the contraction of the outer peripheral ribs 81 and 84 of the bush 75 fitted in the through hole 60 is directed toward the insertion hole 75A, so that the coil leader wire 91a held in the insertion hole 75A is further tightened. Be done. Further, since the elastic force due to the contraction of the outer peripheral rib 82 goes toward the insertion hole 75B, the coil wire 91b held in the insertion hole 75B is further tightened. Further, since the elastic force due to the contraction of the outer peripheral ribs 83 and 86 is directed toward the insertion hole 75C, the coil wire 91c held in the insertion hole 75C is further tightened. As a result, the coil leader wires 91a to 91c are firmly held by the bush 75, so that the coil leader wires 91a to 91c are held in a positioned state. Further, the bush 75 is also suppressed from moving in the vertical direction.

As shown in FIG. 5, the protrusions 77a and 77b are provided at the upper end of the side surface of the bush 75. The recess 55b of the bearing holder 55 has a shape having a step on the inner peripheral surface corresponding to the bush 75. Specifically, the recess 55b is a stepped surface (first surface) formed of a flat surface facing the control board 15 side between the inner peripheral surface 56 on the control board 15 side and the inner peripheral surface 57 on the stator 40 side. Has 58. Of the recesses 55b, the region on the control board 15 side surrounded by the inner peripheral surface 56 is wider than the region on the stator 40 side surrounded by the inner peripheral surface 57 by the amount of accommodating the protrusions 77a and 77b. The bush 75 fitted in the through hole 60 comes into contact with the stepped surface 58 on the lower surfaces of the protrusions 77a and 77b.

According to the above configuration, the bush 75 and the through hole 60 are positioned in the vertical direction by the protrusions 77a and 77b being abutted against the stepped surface 58.

One coil leader wire 91 is inserted into each of the three insertion holes 75A to 75C of the bush 75. The insertion holes 75A to 75C are continuous with the small diameter cylinder portion (first cylinder portion) 71 having an inner diameter equivalent to the thickness of the coil leader wire 91 and the small diameter cylinder portion 71, and the tapered cylinder portion whose inner diameter increases downward. It has a (second cylinder portion) 72 and a large diameter cylinder portion (second cylinder portion) 73 that is continuous with the tapered cylinder portion 72 and has a uniform inner diameter.

According to the above configuration, the coil leader wires 91a to 91c can be easily inserted into the insertion holes 75A to 75C by inserting the coil leader wires 91a to 91c from the large diameter tubular portion 73 on the lower side. The insertion holes 75A to 75C may have at least a small diameter cylinder portion 71 and a large diameter cylinder portion 73. For example, there may be a configuration in which a step is provided between the small diameter cylinder portion 71 and the large diameter cylinder portion 73. The tapered cylinder portion 72 may have a configuration having a conical inner peripheral surface, or may have a configuration in which the generatrix of the cone is not a straight line but is partially curved in the cross-sectional view.

Four inner peripheral ribs 88 are provided on the inner peripheral surface of each of the small diameter tubular portions 71 of the insertion holes 75A to 75C. The inner peripheral ribs 88 are arranged at equal intervals of 90 ° in the circumferential direction of the inner peripheral surface in each of the insertion holes 75A to 75C.

By providing the inner peripheral ribs 88 in the insertion holes 75A to 75C, the coil leader wires 91a to 91c are held in a pressed state by the inner peripheral ribs 88. As a result, the movement of the coil leader wires 91a to 91c from the bush 75 in the exit direction is suppressed.

Since there is a gap between the adjacent inner peripheral ribs 88, the shrinkage range of the inner peripheral ribs 88 is large, and even if the outer diameters of the coil leader wires 91a to 91c are slightly changed, they can be held by the same bush 75.

Since the inner peripheral ribs 88 are arranged at equal intervals in the circumferential direction, the elastic force of the inner peripheral ribs 88 acts evenly on the coil leader wires 91a to 91c, and the bush 75 and the coil leader wires 91a to 91c are relative to each other. Movement is further suppressed.

The bush 75 is fitted into the through hole 60 after the coil leader wires 91a to 91c are inserted into the insertion holes 75A to 75C. Therefore, the reaction force generated by the coil leader wires 91a to 91c expanding the insertion holes 75A to 75C and the pressure received by the bush 75 from the inner surface of the through hole 60 act on the coil leader wires 91a to 91c. As a result, the movement in the direction in which the coil leader wire comes out of the bush 75 is suppressed.

The outer peripheral ribs 81 to 87 are provided in a range in the vertical direction in which the small diameter tubular portion 71 is provided. As a result, elastic force is applied to the coil leader wires 91a to 91c in the small diameter tubular portion 71, which is a portion for holding the coil leader wires 91a to 91c, and the coil leader wires 91a to 91c can be firmly held. By providing the outer peripheral ribs 81 to 87 only in a necessary range, it is possible to prevent the outer peripheral ribs 81 to 87 from becoming a resistance when the bush 75 is fitted into the through hole 60, and the bush 75 can be smoothly fitted into the through hole 60. Can be included.

In the bush 75, the outer surface 75b on the inner side in the radial direction of the motor 10 is an outer surface having no outer peripheral rib. The outer surface 75b of the bush 75 faces the central axis J of the shaft 31 in the radial direction. The outer side surface 75b includes a flat surface extending in a direction orthogonal to the radial direction of the motor 10. The inner peripheral surface of the recess 55b facing outward in the radial direction also includes a flat surface, and the flat surface of the recess 55b and the flat surface of the outer surface 75b face each other and come into contact with each other. As a result, the bush 75 is accurately positioned in the radial direction with respect to the shaft 31. As a result, the coil leader wires 91a to 91c held by the bush 75 can be accurately pulled out to the upper surface side of the bearing holder 55, and the connectivity to the control board 15, the connector, or the like can be improved.

In the present embodiment, the case where the through hole 60 is composed of the inner peripheral surface 20c of the housing 20 and the recess 55b of the bearing holder 55 has been described, but the through hole is provided only in the partition wall (bearing holder 55). It may be provided only on the outer wall of the housing 20. The outer wall refers to the tubular portion 21 or the bottom wall portion 23 of the housing 20.

The detailed shape of each member may be different from the shape shown in each drawing of the present application. Further, the elements appearing in the above-described embodiments and modifications may be appropriately combined as long as there is no contradiction.

10 ... motor, 15 ... control board, 20 ... housing, 20a ... opening, 21 ... cylinder, 30 ... rotor, 40 ... stator, 55 ... bearing holder (partition wall), 55b ... recess, 58 ... stepped surface (first) One side), 60 ... Through hole, 71 ... Small diameter cylinder part (first cylinder part), 72 ... Tapered cylinder part (second cylinder part), 73 ... Large diameter cylinder part (second cylinder part), 75 ... Bush, 75A, 75B, 75C ... Insertion holes, 77a, 77b ... Protruding parts, 81-86 ... Outer peripheral ribs, 88 ... Inner peripheral ribs, L1, L2 ... Straight lines

Claims (13)

An electrical element, including a stator, and at least one of the control boards.
The rotor placed facing the stator and
A conductive material extending from the electric element toward one side,
A housing for accommodating the electric element and
Along with the housing, a partition wall for accommodating the electrical element,
A bush provided in at least one through hole of the outer wall of the housing and the partition wall and holding a plurality of the conductive materials.
Have,
The bush is an elastic member having a plurality of insertion holes into which the conductive material is inserted, and has a plurality of outer peripheral ribs arranged in the circumferential direction on an outer surface facing the through holes.
The housing is a tubular member that houses the stator and the rotor, and the partition wall is provided at an opening of the housing so as to cover the stator and the rotor.
The through hole is composed of a concave portion provided at the outer peripheral end of the partition wall and recessed in the radial direction, and an inner surface surface of the housing .
motor. The motor according to claim 1, wherein the outer peripheral rib extends to one side thereof. The motor according to claim 1 or 2, wherein the insertion hole of the bush is arranged on a straight line in a direction in which the outer peripheral rib protrudes from the outer surface of the bush in a plan view. The bush has a shape long in the direction in which the plurality of insertion holes are arranged in a plan view.
The motor according to any one of claims 1 to 3, wherein at least one of the outer peripheral ribs is located in the longitudinal direction of the bush with respect to the insertion hole. The bush has a shape long in the direction in which the plurality of insertion holes are arranged in a plan view.
The motor according to any one of claims 1 to 4, wherein at least one of the outer peripheral ribs is located in the lateral direction of the bush with respect to the insertion hole. The bush has a plurality of side surfaces facing the inner surface of the through hole.
The at least one side surface is a surface having no outer peripheral rib.
The motor according to any one of claims 1 to 5, wherein the side surface opposite to the side surface having no outer peripheral rib is a surface having the outer peripheral rib. The insertion hole has a first cylinder portion having a uniform inner diameter and a first cylinder portion.
It has a second cylinder portion that extends from the first cylinder portion and has a larger inner diameter than the first cylinder portion.
The motor according to any one of claims 1 to 6, wherein the outer peripheral rib is provided so as to face the first cylinder portion. The motor according to any one of claims 1 to 6, wherein the bush has an inner peripheral rib on the inner surface of the insertion hole. The bush has a plurality of inner peripheral ribs, and the bush has a plurality of inner peripheral ribs.
The motor according to claim 8, wherein the plurality of inner peripheral ribs are arranged at equal intervals in the circumferential direction of the inner surface of the insertion hole. The insertion hole has a first cylinder portion having a uniform inner diameter and a first cylinder portion.
It has a second cylinder portion that extends from the first cylinder portion and has an inner diameter larger than that of the first cylinder portion.
The motor according to claim 8 or 9, wherein the inner peripheral rib is provided so as to face the first cylinder portion. The stator and the control board are arranged so as to overlap each other in the axial direction.
The motor according to any one of claims 1 to 10, which is connected by the conductive material through the through hole. The bush has, in a part of the outer surface, a protrusion protruding outward from the outer surface.
A first surface of the through hole facing the control board side is provided on a part of the inner surface of the through hole.
The motor according to claim 11, wherein the first surface and the protrusion are in contact with each other. The motor according to claim 12, wherein the bush has the outer peripheral rib on the surface of the protrusion.

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