JPWO2008102778A1 - Holder stay fixing structure and motor with brush - Google Patents

Abstract

In the holder stay fixing structure that uses a rivet to fix the holder stay for supporting the brush that is in sliding contact with the commutator to the end bracket of the motor with brush, the rivet is expanded by buckling deformation at the site where the rivet of the end bracket is inserted. A cylindrical portion for receiving the diameter portion is provided. As a result, it is possible to provide a holder stay fixing structure and a brushed motor that can prevent damage during assembly of the holder stay.

Description

The present invention relates to a holder stay fixing structure and a brush motor using the same.
This application claims priority based on Japanese Patent Application No. 2007-38257 and Japanese Patent Application No. 2007-38258 for which it applied to Japan on February 19, 2007, and uses the content here.

  Conventionally, for example, there is a brush motor as a fan motor used for cooling a radiator of an automobile. This type of brushed motor has a cylindrical yoke with a plurality of permanent magnets attached to its inner peripheral surface, and a bracket that closes the opening of the yoke, and the armature is rotatably supported by the yoke and the bracket. is doing. The armature includes an armature coil and a commutator to which the armature coil is connected. The commutator is provided so as to be relatively movable while being in contact with the brush. This brush is for supplying electric power to the armature coil, and is supported by a holder stay via a brush holder.

The holder stay is formed in a substantially disk shape, and is fixed to the bracket with rivets. That is, in order to fix the holder stay to the bracket, first, the bracket and the holder stay are overlapped, and the rivet is inserted into the rivet hole formed in each. Next, the tip of the rivet shaft is crushed to be buckled (plastically deformed). Then, the tip of the shaft of the rivet is deformed and expands outward in the radial direction to form a flange portion, and the entire shaft inserted through the rivet hole is expanded in a drum shape. Accordingly, the movement of the holder stay in the axial direction and the radial direction with respect to the bracket is restricted, and the holder stay is fixed to the bracket (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
JP 2002-142403 A JP-A-6-165443 Japanese Utility Model Publication No. 5-43758

  By the way, the holder stay is formed of a resin having an insulating property in order to ensure insulation between the brush and the bracket, and it is necessary to consider heat resistance. For example, a thermosetting resin such as a phenol resin is used. It is often done. For this reason, when the shaft portion of the rivet expands in the rivet hole of the holder stay, the rivet hole of the holder stay is pushed outward in the radial direction, and the holder stay may be damaged by stress.

  The present invention has been made in view of the above-described circumstances, and provides a holder stay fixing structure and a brush motor that can prevent damage to the holder stay when the holder stay is fixed to the bracket with a rivet. .

In order to solve the above problems, in the present invention, in the holder stay fixing structure for fixing the holder stay for supporting the brush that is in sliding contact with the commutator to the bracket using the rivet, in the portion through which the rivet of the bracket is inserted, A cylindrical portion for receiving a diameter-enlarged portion due to buckling deformation of the rivet is provided.
By configuring in this way, the diameter of the rivet due to buckling deformation can be received by the cylindrical portion without forcibly expanding the rivet hole of the holder stay, and the holder stay can be fixed to the bracket.

In this case, the cylindrical portion may be provided so as to rise from the bracket toward the holder stay, and the concave portion for receiving the cylindrical portion may be formed in the holder stay.
By configuring in this way, if the cylindrical portion of the bracket is disposed in the recess formed in the holder stay, the cylindrical portion can be disposed in the vicinity of the portion where the rivet has the largest diameter.

In order to solve the above problems, in the present invention, a rivet is formed with a first shaft portion and a second shaft portion provided at the tip of the first shaft portion and having a diameter reduced by a step, and the holder stay A first rivet hole corresponding to the first shaft portion is formed on the bracket, and a second rivet hole serving as the cylindrical portion corresponding to the second shaft portion is formed on the bracket. The first shaft portion of the rivet is inserted through the first rivet hole of the holder stay, and the second shaft portion of the rivet is inserted through the second rivet hole of the bracket.
By comprising in this way, the buckling strength of a 2nd axial part can be weakened rather than the 1st axial part of a rivet. For this reason, when the holder stay is fixed to the bracket using a rivet, the second shaft portion can be deformed without substantially deforming the first shaft portion even if the tip of the rivet is crushed. Moreover, since the diameter-enlarged portion of the second shaft portion due to buckling deformation is received by the second rivet hole, the holder stay can be fixed to the bracket without forcibly expanding the rivet hole of the holder stay.

  The present invention also includes a bracket to which the holder stay is fixed using the above-described holder stay fixing structure, and a yoke to which the bracket is attached, and an armature having the commutator is rotatably disposed in the yoke. A brushed motor is provided.

  According to the present invention, the diameter of the rivet due to buckling deformation can be received by the tubular portion without forcibly expanding the rivet hole of the holder stay, and the holder stay can be fixed to the bracket. For this reason, it is possible to prevent an excessive force from acting on the holder stay, and it is possible to prevent damage when the holder stay is fixed.

  In this case, if the cylindrical portion of the bracket is disposed in the recess formed in the holder stay, the cylindrical portion can be disposed in the vicinity of the portion where the rivet has the largest diameter. For this reason, the diameter-enlarged portion of the rivet can be received more efficiently by the cylindrical portion, and the holder stay can be securely fixed to the bracket.

  Further, when the rivet is provided with the first shaft portion and the second shaft portion having a diameter reduced from the first shaft portion, the buckling strength of the second shaft portion can be weaker than that of the first shaft portion of the rivet. it can. For this reason, when the holder stay is fixed to the bracket using a rivet, the second shaft portion can be deformed without substantially deforming the first shaft portion even if the tip of the rivet is crushed. Therefore, it is possible to prevent an excessive force from acting on the holder stay through which the first shaft portion is inserted, and it is possible to prevent damage when the holder stay is fixed.

  In addition, according to the present invention, it is possible to prevent damage at the time of fixing the holder stay, and thus it is possible to provide a motor with a brush with improved assembly workability.

It is a longitudinal cross-sectional view which shows the structure of the motor with a brush in 1st embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of a rivet in a first embodiment of the present invention. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is explanatory drawing of the fixing procedure using the rivet in 1st embodiment of this invention. It is a perspective view of the rivet in 2nd embodiment of this invention. It is sectional drawing corresponding to the part in alignment with the BB line of FIG. 2 in 2nd embodiment of this invention. It is explanatory drawing of the fixing procedure using the rivet in 2nd embodiment of this invention.

Explanation of symbols

  1 motor with brush, 2 yoke, 6 armature, 13 commutator, 17 end bracket (bracket), 20 holder stay, 22 brush, 28, 128 rivets, 36, 136 expanded diameter part, 40 cylindrical part, 42 recessed part, 129 end Bracket side rivet hole (second rivet hole), 130 Holder stay side rivet hole (first rivet hole), 132 First shaft portion, 133 Second shaft portion,

Next, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG.1 and FIG.2, the motor 1 with a brush becomes a drive source of the electrical equipment (for example, radiator fan) mounted in a vehicle. The brushed motor 1 includes an armature 3 rotatably provided in a bottomed cylindrical yoke 2, and an opening 2 c of the yoke 2 is closed with an end bracket 17.

  From the peripheral wall 2a of the yoke 2, a stay 9 used for fixing the brushed motor 1 to the outside protrudes, while a plurality of permanent magnets 4 are juxtaposed along the circumferential direction inside the peripheral wall 2a. ing. Further, a boss portion 10 is formed in the end portion (bottom portion) 2b of the yoke 2 at a substantially radial center. The boss portion 10 is formed with an insertion hole 11 for inserting the rotation shaft 5 of the armature 3 and a bearing 12 for rotatably supporting one end side of the rotation shaft 5.

  The armature 3 includes an armature core 6 fixed to the outside of the rotary shaft 5, an armature coil 7 wound around the armature core 6, and a commutator 13 disposed on the other end side of the rotary shaft 5. . The armature core 6 is obtained by laminating a plurality of ring-shaped metal plates 8 in the axial direction. A plurality of T-shaped teeth are radially formed on the outer periphery of the armature core 6, and enamel-coated windings 16 are wound around the teeth. As a result, a plurality of armature coils 7 are formed on the outer periphery of the armature core 6.

  A plurality of segments 14 made of a conductive material are attached to the outer peripheral surface of the commutator 13. The segments 14 are made of plate-like metal pieces that are long in the axial direction, and are fixed in parallel at equal intervals along the circumferential direction in a state of being insulated from each other. A riser 15 that is folded back to the outer diameter side is integrally formed with the segment 14 at the end of each segment 14 on the armature core 6 side. A winding start end and a winding end end of the winding 16 drawn from the armature coil 7 are respectively wound around the riser 15 and fixed by fusing. Thereby, the segment 14 and the armature coil 7 corresponding to this are electrically connected.

  The end bracket 17 is made of metal and is formed in a substantially disk shape, and a boss portion 18 is formed so as to protrude at a substantially central portion in the radial direction. A bearing 19 for rotatably supporting the other end side of the rotating shaft 5 is press-fitted and fixed to the boss portion 18. A holder stay 20 is attached to the inside of the end bracket 17 (the lower side in FIG. 1).

  The holder stays 20 are made of resin and formed in a substantially disk shape, and four brush holders 21 are fixed at equal intervals in the circumferential direction. Each brush holder 21 is provided with a brush 22 that can be moved in and out in a state where the brush 22 is urged through a spring 23. The tip portions of the brushes 22 are biased by the springs 23 and are in contact with the segments 14 of the commutator 13 so as to be relatively movable.

  Each brush 22 is connected to each terminal 26 provided on the power distribution board 25 via a pigtail 24. These terminals 26 are electrically connected to the connector 27 through a pattern (not shown). The connector 27 is connected to a connector (not shown) connected to an external power supply (not shown). That is, power from an external power source is supplied to each brush 22 via the terminal 26, the pigtail 24, and the like, and is supplied from these brushes 22 to the commutator 13.

Here, the holder stay 20 is fixed to the end bracket 17 using two rivets 28 and 28.
As shown in FIG. 2, the rivet 28 is provided at two points symmetrical with respect to the commutator 13. Further, as shown in FIG. 3, the rivet 28 is made of aluminum or the like, and has a substantially disc-shaped head portion 31 and a shaft portion 32 provided on the distal end side (lower side in FIG. 3) of the head portion 31. Is integrally molded.

  The end bracket 17 is formed with a substantially circular convex portion 37 at a portion corresponding to the rivet 28 in a plan view protruding toward the holder stay 20. A cylindrical portion 40 is formed by burring or the like so that the cylindrical portion 40 rises from the end bracket 17 toward the holder stay 20 side at the substantially center in the radial direction of the convex portion 37. The tubular portion 40 is a portion through which the shaft portion 32 of the rivet 28 is inserted, and the inner diameter E2 thereof is set to substantially coincide with the shaft diameter E1 of the shaft portion 32 of the rivet 28.

On the other hand, the holder stay 20 is formed with a substantially circular recess 34 in a plan view for receiving the head portion 31 of the rivet 28 at a portion corresponding to the rivet 28. A rivet hole 30 through which the rivet 28 is inserted is formed substantially at the center in the radial direction of the recess 34.
As shown in detail in FIG. 5, the rivet hole 30 is formed with a plurality of convex portions 30 a extending in the axial direction of the rivet hole 30 and projecting radially inward at equal intervals in the circumferential direction. The convex portion 30a is formed in a substantially triangular shape in plan view from the axial direction so as to gradually taper as it goes radially inward.

The hole diameter E3 of the rivet hole 30 is set to be slightly larger than the shaft diameter E1 of the shaft portion 32 of the rivet 28. That is, the hole diameter E3 of the rivet hole 30 is set to be larger than the inner diameter E2 of the cylindrical portion 40 of the end bracket 17 and is set to correspond to the maximum diameter of the enlarged diameter portion 36 of the rivet 28 described later. On the other hand, the diameter E4 of the circle connecting the vertices of the convex portions 30a is set so as to substantially match the shaft diameter E1 of the shaft portion 32 of the rivet 28.
A recess 42 for receiving the tubular portion 40 is formed on the end bracket 17 side of the rivet hole 30.

The recess 42 is formed in a substantially circular shape in plan view, and has a peripheral wall 42a and a bottom wall 42b. The depth H1 of the concave portion 42 is set to be larger than the rising height H2 of the cylindrical portion 40. As a result, the mating surface 20a of the holder stay 20 and the convex portion 37 of the end bracket 17 can come into contact with each other. ing.
In addition, the diameter E5 of the peripheral wall 42a is set to be slightly larger than the outer diameter E6 of the tubular portion 40. As a result, the shaft portion 32 of the rivet 28 is deformed to expand, so that the tubular portion 40 is radially outward. Even if it is a case where it pushes and spreads toward, the cylindrical part 40 and the recessed part 42 of the holder stay 20 do not interfere.

  In the rivet 28 inserted into the cylindrical portion 40 of the end bracket 17 and the rivet hole 30 of the holder stay 20 formed in this way, a collar portion 35 that is crushed and buckled and deformed at the tip of the shaft portion 32 is formed. In addition to being formed, a drum-shaped enlarged diameter portion 36 is formed closer to the proximal end than the distal end (see FIG. 4). That is, the end bracket 17 and the holder stay 20 are restricted from moving in the axial direction by the head 31 and the flange 35 of the rivet 28.

On the other hand, the diameter-expanded portion 36 of the rivet 28 is in close contact with the cylindrical portion 40 of the end bracket 17, and the convex portion 30 a formed in the rivet hole 30 of the holder stay 20 is slightly pressed. The end bracket 17 and the holder stay 20 are restricted from moving in the radial direction. Thus, the buckle deformation of the rivet 28 ensures that the holder stay 20 is securely fixed to the end bracket 17 without rattling.
Since the cylindrical portion 40 is disposed in a recess 42 formed in the holder stay 20, a portion where the shaft portion 32 of the rivet 28 expands the most diameter (the head 31 of the shaft portion 32 of the rivet 28 and the flange 31). It is located in the vicinity of (substantially the center between the portion 35).

Next, a procedure for fixing the holder stay 20 to the end bracket 17 using the rivet 28 will be described.
As shown in FIG. 6, first, the two parts 17 and 20 are overlapped while aligning the positions of the cylindrical portion 40 of the end bracket 17 and the rivet hole 30 of the holder stay 20. Next, the shaft portion 32 of the rivet 28 faces the holder stay 20 side, and the rivet 28 is inserted into the rivet hole 30 and the tubular portion 40 from the holder stay 20 side.

  In the rivet 28 inserted into the rivet hole 30 and the tubular portion 40, the head portion 31 is disposed in the concave portion 34 of the holder stay 20, while the distal end side of the shaft portion 32 protrudes from the end bracket 17. In this state, the head 31 is crushed along the axial direction while holding the head 31 with a jig (not shown) so that the rivet 28 does not come out (crush in the direction of arrow D in FIG. 6). ).

  Then, as shown in FIG. 4, the shaft portion 32 is buckled and deformed so that the tip end of the shaft portion 32 extends outward in the radial direction, thereby forming the flange portion 35. At the same time, the base end side of the shaft portion 32 (the rivet hole 30 and the portion inserted into the tubular portion 40) bulges outward in the radial direction to form a diameter-expanded portion 36. At this time, since the cylindrical portion 40 is disposed in the vicinity of the portion where the shaft portion 32 of the rivet 28 is most expanded in diameter, the convex portion 30 a of the rivet hole 30 is slightly pressed by the expanded diameter portion 36 of the rivet 28. Only, the cylindrical portion 40 receives a buckling load from the enlarged diameter portion 36 of the rivet 28.

  For this reason, the rivet hole 30 is not forcedly expanded, and damage to the holder stay 20 can be prevented. On the other hand, since the cylindrical portion 40 is made of a highly rigid metal, even if the shaft portion 32 is expanded in diameter by the buckling deformation of the rivet 28 and the cylindrical portion 40 is expanded outward in the radial direction, There is no possibility that the cylindrical portion 40 (end bracket 17) is damaged. Thereby, the fixing using the rivet 28 between the end bracket 17 and the holder stay 20 is completed.

According to this embodiment, since the cylindrical part 40 for inserting the shaft part 32 of the rivet 28 is formed in the end bracket 17, the diameter-enlarged part of the rivet 28 due to buckling deformation in the cylindrical part 40. The holder stay 20 can be securely fixed to the end bracket 17 under the buckling load from 36. On the other hand, in the rivet hole 30 of the holder stay 20, the convex portion 30 a is only slightly pressed against the enlarged diameter portion 36 of the rivet 28.
For this reason, the rivet hole 30 of the holder stay 20 is not expanded. As a result, it is possible to prevent an excessive force from acting on the holder stay 20, and it is possible to prevent damage when the holder stay 20 is fixed.

  Further, since the cylindrical portion 40 is formed so as to rise from the end bracket 17 toward the holder stay 20 side, the holder stay 20 is formed with a recess 42 for receiving the cylindrical portion 40, so that the cylindrical portion 40 can be disposed in the vicinity of the portion where the rivet 28 has the largest diameter (approximately the center between the head portion 31 and the flange portion 35 of the shaft portion 32). For this reason, the enlarged diameter part 36 of a rivet can be received by the cylindrical part 40 more efficiently, and the holder stay 20 can be reliably fixed to the end bracket 17.

  Furthermore, since the holder stay 20 can be securely fixed to the end bracket 17 while preventing damage when the holder stay 20 is assembled, the assembly workability of the brushed motor 1 can be improved.

  In the above-described embodiment, a case has been described in which the tubular portion 40 formed by burring or the like on the end bracket 17 is formed so as to rise from the end bracket 17 toward the holder stay 20 side. However, the structure of this portion is not limited to this, and the tubular portion 40 may be formed separately from the end bracket 17 and integrated with the end bracket 17 by welding or the like.

  Furthermore, in the above-described embodiment, the cylindrical portion 40 is formed so as to rise from the end bracket 17 toward the holder stay 20, while the holder stay 20 is formed with a recess 42 that receives the cylindrical portion 40. However, the structure of this portion is not limited to this, and the cylindrical portion 40 is in the end bracket 17 and can receive a buckling load from the enlarged diameter portion 36 of the rivet 28. What is necessary is just to be arrange | positioned in the site | part.

Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, in the following description, about the member which has the structure similar to 1st embodiment mentioned above, the code | symbol same as 1st embodiment is attached | subjected and the description is abbreviate | omitted.
Also in this embodiment, the holder stay 20 is fixed to the end bracket 17 using two rivets 128 and 128. That is, as shown in FIG. 2 described above, the rivets 128 are provided at two points symmetrical with respect to the commutator 13. Further, as shown in FIG. 7, the rivet 128 is formed of aluminum or the like, and has a substantially disc-shaped head 131 and a first shaft portion provided on the distal end side (lower side in FIG. 7) of the head 131. 132 and a second shaft portion 133 which is provided on the distal end side of the first shaft portion 132 and whose diameter is reduced by a step is integrally formed. That is, for example, when the shaft diameter E11 of the first shaft portion 132 is set to about 3 mm, the shaft diameter E12 of the second shaft portion 133 is set to about 2 mm.

  Similar to the first embodiment, the end bracket 17 is formed with a convex portion 37 having a substantially circular shape in a plan view projecting toward the holder stay 20 at a portion corresponding to the rivet 128. Further, an end bracket-side rivet hole 129 (second rivet hole) for inserting the rivet 128 is formed at the substantially center in the radial direction of the convex portion 37. The diameter of the end bracket-side rivet hole 129 is set to a size corresponding to the shaft diameter E12 of the second shaft portion 133 of the rivet 128.

On the other hand, as in the first embodiment, the holder stay 20 is formed with a substantially circular recess 34 in a plan view for receiving the head portion 31 of the rivet 128 at a portion corresponding to the rivet 128. A holder stay side rivet hole 130 (first rivet hole) through which the rivet 128 is inserted is formed at substantially the center in the radial direction of the recess 34.
As shown in detail in FIG. 5 described above, the holder stay side rivet hole 130 is disposed near the end bracket 17 in the axial direction of the holder stay side rivet hole 130 and radially inward as in the first embodiment. A plurality of projecting protrusions 130a are formed at equal intervals in the circumferential direction. The convex part 130a is formed in a substantially triangular shape in plan view from the axial direction so as to taper gradually toward the inner side in the radial direction.

The hole diameter E13 of the holder stay side rivet hole 130 is set to be slightly larger than the shaft diameter E11 of the first shaft portion 132 of the rivet 128.
On the other hand, the diameter E14 of the circle connecting the vertices of the convex portion 130a is set to substantially coincide with the shaft diameter E11 of the first shaft portion 132 of the rivet 128. Further, the convex portion 130a is formed in a taper shape so as to be inclined slightly inward in the radial direction from the head 131 side (upper side in FIG. 8) of the rivet 128 toward the distal end side (lower side in FIG. 8) of the rivet 128. Yes.

  Specifically, the diameter E14 of the circle connecting the apexes of the convex portion 130a is set to a size that substantially matches the shaft diameter E11 of the first shaft portion 132 on the head 131 side of the rivet 128, and the tip side of the rivet 128 On the (second shaft portion 133 side), it is set slightly smaller than the shaft diameter E11 of the first shaft portion 132. For this reason, the movement of the holder stay 20 in the radial direction with respect to the end bracket 17 can be restricted without an excessive force acting on the holder stay 20.

  In the rivet 128 inserted into the end bracket side rivet hole 129 and the holder stay side rivet hole 130 formed in this way, a collar portion 135 that is crushed and buckled and deformed at the tip of the second shaft portion 133 is formed. A drum-shaped enlarged diameter portion 136 that is buckled and deformed is formed on the proximal end side (first shaft portion 132 side) of the second shaft portion 133 (see FIG. 8).

  That is, the end bracket 17 and the holder stay 20 are restricted from moving in the axial direction by the head 131 and the flange 135 of the rivet 128. Further, the diameter-enlarged portion 136 of the rivet 128 is in close contact with the end bracket-side rivet hole 129 so as to push the end bracket-side rivet hole 129 so that the radial movement of the end bracket 17 relative to the holder stay 20 is restricted. . Thus, the buckle deformation of the rivet 128 ensures that the holder stay 20 is securely fixed to the end bracket 17 without rattling.

Next, a procedure for fixing the holder stay 20 to the end bracket 17 using the rivet 128 will be described.
As shown in FIG. 9, first, the end bracket side rivet hole 129 and the holder stay side rivet hole 130 are aligned, and the both 17 and 20 are overlapped. Next, the second shaft portion 133 of the rivet 128 faces the holder stay 20 side, and the rivet 128 is inserted into the end bracket side rivet hole 129 and the holder stay side rivet hole 130 from the holder stay 20 side.

  In the rivet 128 inserted into the end bracket side rivet hole 129 and the holder stay side rivet hole 130, the head portion 131 is disposed in the concave portion 34 of the holder stay 20, while the distal end side of the second shaft portion 133 is at the end bracket 17. It will be in the state which protruded from. In this state, the head 131 is crushed along the axial direction while holding the head 131 with a jig (not shown) so that the rivet 128 does not come out (in the direction of arrow d in FIG. 9). Crush).

  Then, as shown in FIG. 8, the second shaft portion 133 is buckled and deformed so that the distal end of the second shaft portion 133 extends outward in the radial direction, thereby forming a flange 135. At the same time, the base end side of the second shaft portion 133 (the portion inserted into the end bracket side rivet hole 129) bulges outward in the radial direction to form a diameter-expanded portion 136.

  On the other hand, the shaft diameter of the first shaft portion 132 is set larger than that of the second shaft portion 133, that is, the buckling strength is higher than that of the second shaft portion 133. In addition, the second shaft portion 133 is not gradually reduced in diameter from the first shaft portion 132 but is rapidly reduced in diameter by a step. For this reason, a buckling load acts on the second shaft portion 133, and the rivet 128 is buckled and deformed at this portion and the buckling load is absorbed, so that the buckling load hardly acts on the first shaft portion 132. Therefore, the first shaft portion 132 is hardly buckled.

Further, when the second shaft portion 133 is buckled and deformed, the end bracket side rivet hole 129 is pushed outward in the radial direction, and the end bracket side rivet hole 129 receives a buckling load from the enlarged diameter portion 136 of the rivet 128. receive. That is, in the present embodiment, the end bracket side rivet hole 129 acts in the same manner as the cylindrical portion 40 in the first embodiment. Since the end bracket 17 is made of a metal having higher rigidity than the rivet 128, there is no possibility that the end bracket 17 that receives the buckling load from the enlarged diameter portion 136 is damaged.
Thereby, the fixing using the rivet 128 between the end bracket 17 and the holder stay 20 is completed.

That is, according to the above-described embodiment, in addition to the same effects as in the above-described embodiment 1, the rivet 128 is formed by integrally forming the head portion 131, the first shaft portion 132, and the second shaft portion 133. Therefore, the buckling strength of the second shaft part 133 can be weaker than that of the first shaft part 132 of the rivet 128. For this reason, when the holder stay 20 is fixed to the end bracket 17 using the rivet 128, the first shaft portion 132 is hardly buckled and deformed even if the tip of the rivet 128 is crushed, and the second shaft portion 133 is seated. Can be bent and deformed.
Therefore, the holder stay side rivet hole 130 through which the first shaft portion 132 is inserted is not forcibly expanded. As a result, it is possible to prevent an excessive force from acting on the holder stay side rivet hole 130, and thus it is possible to prevent damage when the holder stay 20 is fixed.

  The convex portion 130a formed in the holder stay side rivet hole 130 is such that the head 131 side of the rivet 128 substantially coincides with the shaft diameter E11 and the tip side of the rivet 128 is larger than the shaft diameter E11 of the first shaft portion 132. It is formed in a tapered shape so as to be slightly smaller. For this reason, the movement of the holder stay 20 in the radial direction with respect to the end bracket 17 can be restricted without exerting an excessive force on the holder stay 20, and the end bracket 17 and the holder stay 20 are more securely fixed to each other. can do.

Further, even if the tip of the rivet 128 is crushed, the first shaft portion 132 of the rivet 128 is hardly buckled and deformed. Therefore, the hole diameter of the holder stay side rivet hole 130 is hardly considered, considering the amount of deformation of the first shaft portion 132. E13 and the diameter E14 of the circle connecting the vertices of the convex portion 130a can be determined. That is, it becomes possible to easily manage the dimensions of the holder stay side rivet hole 130.
Since the holder stay 20 can be securely fixed to the end bracket 17 while preventing damage when the holder stay 20 is fixed, the workability of assembling the brushed motor 1 can be improved.

  Further, since the convex portion 130a is formed in the holder stay side rivet hole 130, even if the first shaft portion 132 of the rivet 128 is buckled and expanded in diameter, the enlarged diameter portion is used as the holder stay side rivet hole. It can receive only by the convex part 130a instead of receiving by 130 whole. For this reason, it becomes possible to prevent damage to the holder stay 20 more reliably.

  In the above-described embodiment, the hole diameter E13 on the head 131 side of the holder stay side rivet hole 130 is set to a size substantially equal to the shaft diameter E11 of the first shaft portion 132, and the hole diameter E14 on the distal end side is The case where the shaft diameter E11 of the first shaft portion 132 is set to be slightly smaller and formed in a tapered shape has been described. However, the structure of this portion is not limited to this, and the first shaft portion 132 of the rivet 128 is tapered from the base end side (upper side in FIG. 7) to the front end side (lower side in FIG. 7). Alternatively, both the holder stay side rivet hole 130 and the first shaft portion 132 may be formed in a cylindrical shape without providing a tapered portion.

Further, the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the brushed motor 1 is a drive source of an electrical component (for example, a radiator fan) mounted on a vehicle has been described. However, the brushed motor to which the present invention is applicable is described below. However, the present invention is not limited to this, and the holder stay fixing structure of this embodiment can be applied to rivet fixing between the end bracket of various motors with brushes and the holder stay.

  Further, in the above-described embodiment, a case has been described in which the brush holder 21 is disposed on the holder stay 20, and the brush 22 is housed in the brush holder 21 so as to be able to appear and retract in a state of being biased via the spring 23. . However, the structure of the brush to which the present invention is applicable is not limited to this, and the brush 22 is supported by a leaf spring without using the brush holder 21, and the leaf spring moves the brush 22 toward the commutator 13. An urging structure may be used.

  Further, in the above-described embodiment, the case where the holder stay 20 is fixed to the end bracket 17 using the two rivets 28, 28 (128, 128) has been described. However, the number and arrangement of the rivets 28 (128) are different. The structure is not limited to this, and any structure may be used as long as the holder stay 20 is fixed to the end bracket 17 with at least one rivet 28 (128).

  According to the present invention, it is possible to provide a holder stay fixing structure in which damage to the holder stay is prevented when the holder stay of the brush motor is fixed to the bracket with a rivet, and a brush motor having the holder stay fixing structure. it can.

Claims (4)

In the holder stay fixing structure that uses a rivet to fix the holder stay for supporting the brush that is in sliding contact with the commutator to the bracket,
The holder stay fixing structure which provided the cylindrical part which receives the enlarged diameter part by the buckling deformation of the said rivet in the site | part which inserts the said rivet of the said bracket.   2. The holder stay fixing structure according to claim 1, wherein the cylindrical portion is provided so as to rise from the bracket toward the holder stay, and a concave portion for receiving the cylindrical portion is formed in the holder stay. In the holder stay fixing structure that uses a rivet to fix the holder stay for supporting the brush that is in sliding contact with the commutator to the bracket,
The rivet includes a first shaft portion and a second shaft portion provided at a tip of the first shaft portion and having a diameter reduced by a step.
Forming a first rivet hole corresponding to the first shaft portion in the holder stay, and forming a second rivet hole corresponding to the second shaft portion in the bracket;
A holder stay fixing structure in which the first shaft portion of the rivet is inserted into the first rivet hole of the holder stay, and the second shaft portion of the rivet is inserted into the second rivet hole of the bracket. The bracket to which the holder stay is fixed using the holder stay fixing structure according to claim 1,
A yoke to which the bracket is attached,
A brush motor in which an armature having the commutator is rotatably disposed in the yoke.

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