JP2014239584A - Brush card assembly, and method of manufacturing brush card assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of enhancing the workability when assembling a brush card assembly or when assembling a brush card assembly and a rotor, while reducing the possibility of cracking a brush.SOLUTION: A first groove recessed radially inward and elongating in the circumferential direction is provided at the other end of a brush, and an exposed part not covered with a brush holder is provided at least in the vicinity of the other end of a brush. The exposed part has a second groove elongating radially while being recessed in the circumferential direction. Radial outer end of the second groove is connected with the first groove, and the other end of a press member has a contact part bending toward the center of a hole, and a portion of the contact part is in contact with the first groove, in a brush card assembly.

Description

  The present invention relates to a brush card assembly and a method for manufacturing the brush card assembly.

  Conventionally, a technique has been proposed in which a brush is urged radially inward using a brush spring and the brush is urged toward a commutator. Such a technique is described in Patent Document 1, for example.

  Further, a technique for temporarily fixing a brush using a stopper when assembling the brush holder side sub-assembly has been proposed. Such a technique is described in Patent Document 2, for example.

JP 2010-124518 A JP 07-288952 A

  However, in the technique described in Patent Document 1, when a force is applied toward the radially outer side with respect to the brush, and the portion where the brush and the brush spring are in contact with each other moves to the circumferential side surface of the brush, There was a problem that cracks occurred in the brush due to the force applied to the brush from the brush spring.

  Moreover, in the technique described in Patent Document 2, it is necessary to install a stopper when temporarily fixing the brush, and there is a problem that work man-hours increase and work efficiency deteriorates. Furthermore, when releasing the temporarily fixed state of the brush, since both the brush and the commutator move, there is a possibility that the brush may crack.

  The present invention has been made in view of the above problems, and improves work efficiency when assembling a brush card assembly or assembling a brush card assembly and a rotor, and reduces the possibility of cracks in the brush. The purpose is to provide technology.

  1st Embodiment of this invention is a brush card | curd assembly, Comprising: The disk-shaped brush card | curd provided with the hole penetrated to an axial direction in a center part, and an end surface in radial direction both ends, The said brush A rod-shaped brush with one end faced toward the center of the hole on the card, a brush holder having a side wall portion extending in the axial direction along the circumferential side surface of the brush, and one end portion held by the brush card And the other end surface of the brush has a first groove extending in the circumferential direction while being recessed inward in the radial direction, and the other end surface of the brush is a wire member that contacts the other end surface of the brush. There is an exposed portion that is not covered by the brush holder at least near the other end surface of the brush, and the exposed portion has a second groove that extends in the radial direction while being recessed in the circumferential direction. The radially outer end is the first Connected to the groove, the other end portion of the pressing member has a contact portion that is bent toward the center of the hole, a part of the contact portion, characterized in that contact with the first groove.

  An exemplary second embodiment of the present invention is a method for manufacturing a brush accord assembly, which includes a disc-shaped brush card having a hole penetrating in the axial direction in the center, and end faces at both ends in the radial direction. A rod-shaped brush having one end faced toward the center of the hole on the brush card, a brush holder having a side wall portion extending in the axial direction along a circumferential side surface of the brush, and one end portion A pressure member that is held by the brush card and whose other end is in contact with the other end face of the brush, and the other end face of the brush extends in the circumferential direction while being recessed radially inward. An exposed portion that is not covered by the brush holder in the vicinity of at least the other end surface of the brush, and the exposed portion has a second groove extending in the radial direction while being recessed in the circumferential direction, Radial direction of the second groove The end portion is connected to the first groove, the other end portion of the pressure member has a contact portion that bends toward the center of the hole, and a part of the contact portion is in contact with the first groove. The pressure member is a method for manufacturing a brush card assembly that is elastically deformed radially outward, the step of holding the pressure member on the brush card, and the brush in the hole of the brush card. And a step of moving and temporarily fixing the brush radially outward until the contact portion of the pressure member is connected to the second groove via the first groove; It is characterized by having.

  In the exemplary first embodiment of the present invention, when the brush moves largely outward in the radial direction, the contact portion smoothly moves from the first groove to the second groove, and the contact portion and the second groove are Touch. In this case, the moving distance at which the contact portion is elastically deformed is smaller when the second groove is provided than when the second groove is not provided. For this reason, the force applied to the brush that is proportional to the moving distance by which the contact portion is elastically deformed is also smaller when the second groove is provided than when the second groove is not provided. Therefore, the possibility that cracks occur in the brush can be reduced when the second groove is provided rather than when the second groove is not provided.

  The second exemplary embodiment of the present invention guides the brush radially outward until the contact portion of the pressure member is connected to the second groove via the first groove. Thereby, it is not necessary to provide another member for temporary fixing such as a stopper, and the working efficiency is improved. Further, after the brush card assembly is incorporated into the rotor, the state in which the brush and the pressure member are temporarily fixed can be easily released by applying a force from the radially outer side to the radially inner side. Furthermore, when releasing the temporarily fixed state, the commutator 103 does not move, but the brush 3 moves. That is, since both the commutator 103 and the brush 3 do not move, the possibility of cracks occurring in the brush 3 can be reduced.

It is sectional drawing which shows a motor provided with a brush card assembly. It is a top view which shows a brush card assembly. It is a perspective view which shows a brush card assembly. It is a perspective view which shows a brush card assembly. It is a perspective view of a brush. It is an enlarged side view which shows a brush periphery structure. It is a perspective view of a brush holder. It is an enlarged plan view showing a brush peripheral structure. It is an enlarged plan view which shows the brush periphery structure before temporary fixing. It is an enlarged plan view which shows the brush periphery structure before temporary fixing. It is an enlarged plan view which shows the brush periphery structure after temporary fixing.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present invention, a direction parallel to the central axis J of the motor is “axial direction”, a direction orthogonal to the central axis J of the motor is “radial direction”, and a direction along an arc centered on the central axis J of the motor is defined. These are referred to as “circumferential directions”, respectively. In the present invention, the shape and positional relationship of each part will be described with the central axis J direction as the vertical direction. However, the definition of the vertical direction is not intended to limit the orientation when the motor according to the present invention is used.

  FIG. 1 is a view showing a motor 100 including a brush card assembly 1 according to the present invention. The motor 100 includes a rotor 101 and a stator 104. The rotor 101 is rotatably supported by a stator 104 via a bearing 107.

  The rotor 101 has a shaft 102 and a commutator 103. The stator 104 includes a covered cylindrical housing 105, a magnet 106 fixed to the inner peripheral surface of the housing 105, and the brush card assembly 1. The brush card assembly 1 is housed inside the housing 105.

  FIG. 2 is a top view showing the brush card assembly 1.

  The brush card assembly 1 includes a brush card 2, a plurality of brushes 3 and 4, a plurality of brush holders 5 and 6, a plurality of pressure members 7 and 8, and choke coils 9 and 10. However, in the present invention, the number of brushes, brush holders, pressure members, and choke coils is not limited. For example, the number of brushes may be four.

  Hereinafter, each configuration of the brush card assembly 1 according to the first exemplary embodiment of the present invention will be described with reference to FIGS. 3A, 3B, 4, 5, and 6. FIG. In the following, for convenience, the brush card assembly 1 will be described with respect to a peripheral structure in which the brush 3, the brush holder 5, the pressure member 7, and the choke coil 9 are arranged.

  FIG. 3A is a perspective view of the brush card assembly 1 as seen from the white arrow X in FIG. FIG. 3B is a perspective view of the brush card assembly 1 as seen from the white arrow Y in FIG. 4 and 6 are perspective views of the brush 3 and the brush holder 5, respectively. FIG. 5 is an enlarged side view showing a peripheral structure where the brush 3 is arranged.

  The brush card 2 is a resin disk-shaped member. A hole 21 penetrating in the axial direction is provided in the central portion of the brush card 2. In addition, the brush card 2 includes a guide portion 22 that holds the brush 3 movably in the radial direction, a fixing portion 23 that fixes the brush holder 5 that covers the brush 3, and a force applied to the brush 3 to rectify the brush 3. And a holding portion 24 that holds the processing member 7 that makes contact with the child 103. Note that the brush card does not have to be disk-shaped. For example, an elliptical member having a hole in the center may be used.

  As shown in FIG. 3B, the guide portion 22 of the brush card 2 includes a lower guide surface 221 that faces the axial lower surface of the brush 3 in the axial direction and a pair of lateral guide surfaces 222 </ b> A that face both side surfaces of the brush 3 in the circumferential direction. , 222B. The pair of lateral guide surfaces 222A and 222B extend from both circumferential ends of the lower guide surface 221 toward the upper side in the axial direction. The circumferential width of the brush 3 and the circumferential width between the pair of lateral guide surfaces 222A and 222B are substantially the same. Accordingly, the brush 3 can move stably in the radial direction without being inclined in the circumferential direction.

  As shown in FIG. 3B, the lower guide surface 221 of the brush card 2 has a central portion in the circumferential direction that is recessed in the axial direction in the entire radial region. In this case, the contact area between the lower surface in the axial direction of the brush 3 and the lower guide surface 221 of the brush card 2 is smaller than the lower guide surface that is uniformly flat in the circumferential direction. The frictional resistance generated between them is small, and the brush 3 is easy to move. However, the lower guide surface 221 of this embodiment is not limited to this, and may be flat.

  As shown in FIG. 4, the brush 3 is a rod-shaped member having end surfaces at both ends in the radial direction and arranged on the brush card 2 with the one end surface 31 facing the center of the hole 21. The rod shape may be a columnar shape or a polygonal column shape. The brush 3 of the present embodiment has a substantially quadrangular prism shape, but is not limited to this.

  One end surface 31 of the brush 3 faces the commutator 103 in the radial direction. When the one end surface 31 of the brush 3 and the commutator 103 are in contact with each other, the rotor 101 is energized through the brush 3 and the commutator 103, and the rotor 101 is rotated by the energization.

  As shown in FIGS. 3A, 4, and 5, the other end surface 32 of the brush 3 has a first groove 321 that extends in the circumferential direction while being recessed radially inward in the axially upper region UA. . Further, at least the other end surface 32 of the brush 3 has an exposed portion 33 that is not covered by the brush holder 5. The exposed portion 33 has a second groove 331 that is recessed in the circumferential direction and extends in the radial direction, and a radially outer end portion of the second groove 331 is connected to the first groove 321. That is, the first groove 321 and the second groove 331 are provided in the region UA on the upper side in the axial direction.

  In addition, it is preferable that the axial position of the 1st groove | channel 321 and the 2nd groove | channel 331 is the same. Thereby, when temporarily fixing the brush 3 mentioned later, it can suppress that the brush 3 shakes to an axial direction. That is, the possibility that cracks will occur in the brush 3 can be reduced.

  A portion where the first groove 321 and the second groove 331 are continuous has a curved surface that is recessed radially inward and circumferentially. Thereby, in the process of temporarily fixing the brush 3 to be described later to the brush card 2, the contact portion 721 of the pressure member 7 can smoothly move from the first groove 321 to the second groove 331, and the brush The possibility of cracks occurring in 3 can be reduced. The shape of the part may be an inclined surface instead of a curved surface. A curved surface is a surface connecting points on a curve, whereas an inclined surface is a surface connecting points on a straight line, and there is a clear difference between them.

  The other end surface 32 of the brush 3 has a step portion 34 that is recessed radially inward in a region DA on the lower side in the axial direction. The step portion 34 faces at least a part of the brush card 2 and the housing 105 in the radial direction. That is, the other end surface 32 of the brush 3 is arranged in the order of the step portion 34, at least a part of the brush card 2, and the housing 105 from the radially inner side in the region DA on the lower side in the axial direction. The other end surface 32 of the brush 3 faces the housing 105 in the radial direction in the axially upper region UA in which the first groove 321 and the second groove 331 are provided. That is, the other end surface 32 of the brush 3 is disposed in the order of the first groove 321 and the housing 105 from the radially inner side in the axially upper region UA.

  In addition, an outer wall extending upward in the axial direction is provided on the peripheral edge of the housing 105. The outer wall has a notch that is recessed downward in the axial direction at the same position as the brush 3 in the circumferential direction. The site | part in which the 1st groove | channel 321 of the brush 3 was provided in the notch part can be located. That is, the 1st groove | channel 321 can be located in the radial direction outer side as much as possible among the other end surfaces 32 of the brush 3. Thereby, when releasing the state where the brush 3 to be described later is temporarily fixed to the brush card 2, it is easy to apply a force from the radially outer side to the radially inner side with respect to the other end surface 32 of the brush 3. That is, work efficiency can be improved.

  The upper surface in the axial direction of the protruding portion 231 of the fixed portion 23 is located on the upper side in the axial direction with respect to the upper surface in the axial direction of the brush 3. Thereby, when the brush 3 is temporarily fixed, even if the brush 3 is inclined toward the fixing portion 23 due to the force applied by the pressure member 7, the brush 3 can be prevented from falling off the brush card 2.

  As shown in FIG. 6, the brush holder 5 has an upper wall portion 51 that covers the upper surface in the axial direction of the brush 3, and a side wall portion 52 that extends in the axial direction along the circumferential side surface of the brush 3. The side wall portion 52 includes a side wall 521 that extends downward in the axial direction near the radial center of the brush 3, and leg portions 522 </ b> A and 522 </ b> B that extend downward in the axial direction near the radial end of the brush 3.

  FIG. 7 is an enlarged plan view showing a peripheral structure where the brush 3 is arranged. The brush 3 and the brush holder 5 are not shown.

  The fixing part 23 has a fixing part 23A and a fixing part 23B. The fixing portions 23A and 23B have projecting portions 231A and 231B that extend upward in the axial direction, respectively. The protrusions 231A and 231B have storage portions 232A and 232B that open upward in the axial direction. The leg portions 522A and 522B of the brush holder 5 are press-fitted into the storage portions 232A and 232B, and the brush card 2 and the brush holder 5 are fixed.

  The pressure member 7 is a wire whose one end 71 is held by the brush card 2 and whose other end 72 is in contact with the other end surface 32 of the brush 3. In this embodiment, the pressurizing member 7 is shown as a coil spring including one end portion 71, the other end portion 72, and a body portion 73 wound in a spiral shape.

  The one end portion 72 and the body portion 73 of the pressure member 7 are held by the holding portion 24 of the brush card 2. The holding portion 24 includes a circular holding portion 241 cut out in a substantially circular shape in plan view in accordance with the shape of the body portion 73, and an axial direction along a direction in which the one end portion 71 extends toward the other end surface 32 of the brush 3. And a linear holding portion 242 cut out on the lower side.

  The linear holding portion 242 has a substantially U-shaped cross section when viewed from the direction in which the one end portion 71 extends. The linear holding part 242 has a wall part 2421 that covers the radially outer side of the one end part 71. Here, when the brush 3 described later is temporarily fixed to the brush card 2, a force is applied to the other end portion 72 of the pressing member 7 radially outward by the brush 3. Along with this, a force is also applied to the radially outer side of the one end portion 71 of the pressing member 7. However, in this embodiment, since the wall part 2421 is provided, it can suppress that the one end part 71 of the pressurization member 7 moves to a radial direction outer side. That is, the pressure can be stably applied from the pressure member 7 to the brush 3.

  As shown in FIG. 7, the other end 72 of the pressure member 7 has a contact portion 721 that bends toward the center of the hole 21 of the brush card 2. A part of the contact portion 721 is in contact with the first groove 321 of the brush 3 and elastically deforms. However, the contact portion 721 does not necessarily bend toward the center of the hole 21 of the brush card 2. That is, the direction changes before and after the brush 3 described later is temporarily fixed. Further, the axial width of the contact portion 721 is smaller than the axial widths of the first groove 321 and the second groove 331 provided on the other end surface 32 of the brush 3. Thereby, the contact part 721 of a pressurization member can move the 1st groove | channel 321 and the 2nd groove | channel 331 smoothly. However, this embodiment is not limited to this. That is, the axial width of the contact portion 721 may be equal to or larger than the axial width of each of the first groove 321 and the second groove 331 provided on the other end surface 32 of the brush 3.

  Hereinafter, the manufacturing method of the brush card assembly 1 in 2nd Embodiment of this invention is demonstrated using FIG. 8A, FIG. 8B, and FIG. 8C. 8A and 8B are enlarged plan views showing the brush peripheral structure before temporary fixing. FIG. 8C is an enlarged plan view showing the brush peripheral structure after temporary fixing. 8A and 8B are different in the position of the brush 3 where the contact portion 721 of the pressing member 7 contacts.

  First, the pressure member 7 is held on the brush card 2. That is, the contact portion 721 of the pressing member 7 is directed radially inward, and the circular holding portion 241 of the holding portion 24 and the body portion 73 of the pressing member 7 are overlapped in the axial direction from the upper side in the axial direction. The body part 73 is fitted into the circular holding part 241.

  Here, the brush 3 is disposed on the periphery of the hole 21 of the brush card 2. As shown in FIG. 8A, in the guide portion 22 of the brush card 2, the brush 3 is moved radially outward with the other end face 32 facing radially outward, and added to the first groove 321 of the brush 3. The contact portion 721 of the pressure member 7 is brought into contact. In this state, a force is applied from the pressure member 7 to the brush 3 in the direction indicated by the white arrow in FIG. 8A.

  Subsequently, the brush 3 is further moved radially outward from the state shown in FIG. 8A. FIG. 8B shows a state in which the contact portion 721 of the pressure member 7 is in contact with a portion where the first groove 321 and the second groove 331 of the brush 3 are continuous.

  In this state, force acts on the brush 3 from the pressure member 7 in the direction indicated by the white arrow in FIG. 8B. In this case, the brush 3 may be inclined in the circumferential direction.

  However, as shown in FIG. 8B, the circumferential side surface of the protruding portion 231 </ b> A of the fixing portion 23 </ b> A on the brush 3 side extends radially outward from substantially the same radial position as the radial position of the other end surface 32 of the brush 3. . Therefore, it is possible to suppress the brush 3 from being inclined in the circumferential direction by the circumferential side surface of the protruding portion 231A. That is, the possibility that cracks will occur in the brush 3 can be reduced.

  Finally, the brush 3 is temporarily fixed to the brush card 2. FIG. 8C shows a state after temporary fixing. From the state shown in FIG. 8B, the brush 3 is further moved radially outward to connect the contact portion 721 of the pressing member 7 with the second groove 312 of the brush 3. In this state, force is applied from the pressure member 7 to the brush 3 in the direction indicated by the white arrow in FIG. 8C. This state is a state in which the brush 3 is temporarily fixed to the brush card 2. In addition, in FIG. 8C as well as FIG. 8B, it is possible to suppress the brush 3 from being inclined in the circumferential direction by the circumferential side surface of the protruding portion 231A. That is, the possibility that cracks will occur in the brush 3 can be reduced.

  Subsequently, a process of releasing the temporarily fixed state of the brush 3 will be described.

  First, in a state where the shaft 102 and the hole 21 of the brush card 2 overlap in the axial direction, the shaft 102 is inserted to a predetermined position where the axial heights of the commutator 103 and the brush 3 coincide. A force is applied to the other end surface 32 of the brush 3 from the radially outer side to the radially inner side.

  As a result, the temporarily fixed state of the brush 3 is released in the order of FIG. 8C to FIG. 8B and FIG. 8B to FIG. 8A, the one end face 31 of the brush 3 and the commutator 103 come into contact with each other. The first groove 321 on the other end surface 32 and the contact portion 721 of the pressure member 7 are in contact with each other.

  Thus, since it is not necessary to provide a separate member for temporarily fixing the brush 3, the work process for providing the separate member can be reduced, and the work efficiency is improved. Further, when releasing the temporarily fixed state of the brush 3, the commutator 103 does not move and the brush 3 moves. That is, since both the commutator 103 and the brush 3 do not move, the possibility of cracks occurring in the brush 3 can be reduced.

  The exemplary first embodiment and the second embodiment of the present invention have been described above, but the configuration of the present invention is not limited to the above-described example. For example, you may combine suitably each element which appeared in each embodiment and its modification in the range which does not produce inconsistency.

  In addition, this invention can be utilized for the motor for anti-lock brakes, for example.

J Central shaft 100 Motor 101 Rotor 102 Shaft 103 Commutator 104 Stator 105 Housing 106 Magnet 107 Bearing 1 Brush card assembly 2 Brush card 21 Hole 22 Guide portion 221 Lower guide surface 222 Lateral guide surface 23 Fixed portion 231 Protruding portion 232 Storage portion 24 Holding part 241 Circular holding part 242 Straight holding part 2421 Wall part 3, 4 Brush 31 One end face 32 Other end face UA Axial upper area DA Axial lower area 321 First groove 33 Exposed part 331 Second part Groove 34 Stepped part 5, 6 Brush holder 51 Upper wall part 52 Side wall part 53 Leg part 7, 8 Pressure member 71 One end part 72 Other end part 721 Contact part 73 Body part 9, 10 Choke coil

Claims (7)

A disc-shaped brush card with a hole penetrating in the axial direction in the center;
Rod-shaped brushes each having an end face at both ends in the radial direction and arranged with the one end face toward the center of the hole on the brush card;
A brush holder having a side wall extending in the axial direction along a circumferential side surface of the brush;
A pressure member, one end of which is held by the brush card and the other end of which is a wire that contacts the other end of the brush;
With
The other end surface of the brush has a first groove extending in the circumferential direction while being recessed radially inward,
There is an exposed portion that is not covered by the brush holder in the vicinity of at least the other end surface of the brush, and the exposed portion has a second groove that extends in the radial direction while being depressed in the circumferential direction,
The radially outer end of the second groove is connected to the first groove, and the other end of the pressure member has a contact portion that bends toward the center of the hole,
The brush card assembly, wherein a part of the contact portion is in contact with the first groove.   The brush card assembly according to claim 1, wherein a portion where the radially outer end portion of the second groove and the first groove are connected has a curved surface.   The brush card assembly according to claim 1, wherein the axial positions of the contact portion, the first groove, and the second groove are the same.   The brush card assembly according to claim 1, wherein an axial width of the contact portion is smaller than an axial width of each of the first groove and the second groove.   The other end surface of the brush has a step portion that is recessed radially inward in a region on the lower side in the axial direction, and has the first groove and the second groove in a region on the upper side in the axial direction. The brush card assembly according to claim 1. The brush card has a holding portion that holds one end of the pressure member,
The brush card assembly according to claim 1, wherein the holding portion has a wall portion that covers a radially outer side of the one end portion. A disc-shaped brush card with a hole penetrating in the axial direction in the center;
Rod-shaped brushes each having an end face at both ends in the radial direction and arranged with the one end face toward the center of the hole on the brush card;
A brush holder having a side wall extending in the axial direction along a circumferential side surface of the brush;
A pressure member, one end of which is held by the brush card and the other end of which is a wire that contacts the other end of the brush;
With
The other end surface of the brush has a first groove extending in the circumferential direction while being recessed radially inward,
There is an exposed portion that is not covered by the brush holder in the vicinity of at least the other end surface of the brush, and the exposed portion has a second groove that extends in the radial direction while being depressed in the circumferential direction,
The radially outer end of the second groove is connected to the first groove, and the other end of the pressure member has a contact portion that bends toward the center of the hole,
A part of the contact portion is a method of manufacturing a brush card assembly in contact with the first groove,
Holding the pressure member on the brush card;
Arranging the brush around the hole of the brush card;
Moving and temporarily fixing the brush radially outward until the contact portion of the pressure member is connected to the second groove via the first groove;
A method of manufacturing a brush card assembly.

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