JP2006211751A - Installation structure of motor brush holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation structure of a motor brush holder that surely prevents the installation failure of a brush holder and surely operates a motor by smoothly sliding a brush. <P>SOLUTION: The installation structure of the motor brush holder is constituted such that: the metallic brush holder 10 for holding the brush 16 so that the brush freely frequently appears is formed of a pair of opposing side pieces 11, 11 and a ceiling piece 12, and formed into a U-shape at its cross section; fixing pieces 14 are arranged at ends of reverse-ceiling piece sides of the pair of side pieces 11, 11 so as to protrude therefrom; the fixing pieces 14 of the pair of side pieces 11, 11 are penetrated into a pair of installation holes 24, 24 formed at a resin-made holder base 23 from its one end face to the other end face; and the brush holder 10 is installed to the holder base 23 by being bent at the other end face 23b side of the holder base 23. Protrusions 25 are formed inside a gap between the pair of fixing pieces 14 of the brush holder 10 on the other end face 23b of the holder base 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a brush holder mounting structure for a motor suitable for use in mounting a metal brush holder for storing and holding a brush used for motor commutation on a resin holder base.

  As a brush holder mounting structure of this type of motor, there is one shown in FIGS. 7 to 9 (see, for example, Patent Document 1).

  As shown in FIGS. 7 to 9, the metal brush holder 1 used in the brush holder mounting structure of the motor has a cross-section of a pair of side pieces 2, 2, a ceiling piece 3 and a rear piece 4 facing each other. It has a letter-shaped hollow rectangular tube shape, and a brush 7 urged toward a commutator (not shown) by a coil spring is housed and held in a retractable manner. Further, a pair of fixing pieces 5 and 5 project from the ends of the pair of side pieces 2 and 2 on the side opposite to the ceiling.

  The pair of fixed pieces 5 and 5 integrally formed on the pair of side pieces 2 and 2 of the brush holder 1 are formed by penetrating from one end face of the disc-shaped holder base 8 to the other end face. The holder base 8 is bent at the other end face 8b side by caulking. As a result, the brush holder 1 is attached to the holder base 8, and the brush 7 stored and held in the brush holder 1 so as to freely move in and out slides on the one end surface 8a of the holder base.

Japanese Unexamined Patent Publication No. 7-322572 (FIGS. 8 and 9)

Japanese Utility Model Publication No. 2-42058 (FIGS. 5 and 6)

  However, in the conventional motor brush holder mounting structure, the fixing pieces 5 of the pair of side pieces 2 and 2 of the metal brush holder 1 are crimped to the other end face 8b side of the resin holder base 8 to form an L-shape. Since it is bent in the shape (substantially right angle), the bent portion (clamping portion) of the pair of fixed pieces 5 and 5 bent in this L shape is loosened to the mounting state of the brush holder 1 due to the return deformation (spring back). There was a defect that it was easy to generate or play. Due to the mounting failure of the brush holder 1, the brush 7 stored and held in the brush holder 1 can be moved smoothly on the holder 8, which may make it difficult to operate the motor.

  Further, when a housing case such as a metal end cover comes close to the other end surface 8b of the resin holder base 8 due to the reduction in size and thickness of the motor, a pair of fixed pieces of the metal housing case and the brush holder 1 are used. Since the edge surface distance with the 5 and 5 bent portions becomes small, it is necessary to interpose an insulating member such as an insulating sheet between them, which increases the number of parts and increases the cost.

  Accordingly, the present invention has been made to solve the above-described problems, can reliably prevent mounting failure of the brush holder, and can operate the motor reliably by sliding the brush smoothly. It is an object to provide a brush holder mounting structure for a motor.

  According to the first aspect of the present invention, a metal brush holder that accommodates and holds a brush so as to be retractable is formed in a U-shaped cross section with a pair of side pieces facing each other and a ceiling piece, and an anti-ceiling of the pair of side pieces. Fixing pieces project from the end portions on one side, and the fixing pieces of the pair of side pieces are passed through a pair of mounting holes formed by penetrating from one end surface of the resin holder base to the other end surface. In the brush holder mounting structure of a motor in which each of the fixed pieces penetrating through the mounting holes is bent on the other end surface side of the holder base so that the brush holder is mounted on the holder base, the other end surface of the holder base A recess is formed inside the pair of fixed pieces of the brush holder.

  According to a second aspect of the present invention, in the brush holder mounting structure for a motor according to the first aspect, the concave portion of the other end surface of the holder base is respectively upward from the pair of fixed pieces toward the center between the pair of fixed pieces. An inclined taper surface is formed.

  According to a third aspect of the present invention, in the brush holder mounting structure for a motor according to the first aspect, the pair of fixed pieces are bent at fulcrums at positions closer to the pair of fixed pieces of the recesses on the other end surface of the holder base. It is characterized in that convex portions are formed respectively.

  As described above, according to the first aspect of the present invention, the recesses are formed inside the pair of fixed pieces of the metal brush holder on the one end surface of the resin holder base. When attaching the brush holder to the holder base by bending the fixed piece on the other end surface side of the holder base, the pair of fixed pieces are bent in advance in advance in consideration of the return deformation of each bent portion of the pair of fixed pieces. Can do.

  Even if a housing case such as a metal end cover is disposed close to the other end surface of the resin holder base due to the miniaturization and thinning of the motor, a pair of the metal housing case and the metal brush holder The edge surface distance with each bending part of a fixed piece can be ensured reliably. Thereby, it is not necessary to interpose an insulating member such as an insulating sheet between the bent portions of the pair of fixed pieces of the metal housing case and the metal brush holder, and the cost can be reduced correspondingly. .

  According to the invention of claim 2, the pair of fixed pieces is formed by forming the tapered surfaces inclined upward from the pair of fixed pieces to the center between the pair of fixed pieces in the concave portion of the other end surface of the holder base. At the time of bending, the pair of fixed pieces can be bent at an acute angle along the tapered surfaces on both sides of the concave portion in consideration of the return deformation of each bent portion of the pair of fixed pieces. Thereby, a metal brush holder can be reliably attached to one end surface of the resin holder base, and the motor can be operated reliably by sliding the brush smoothly on the holder base.

  According to the third aspect of the present invention, the convex portions serving as the folding fulcrums of the pair of fixed pieces are formed at positions close to the pair of fixed pieces of the concave portion on the other end surface of the holder base, whereby the pair of fixed pieces are bent. Sometimes, the pair of fixed pieces can be reliably bent at an acute angle along the convex portions on both sides of the concave portion, and return deformation of the bent portions of the pair of fixed pieces can be reliably prevented. Thereby, the attachment failure of a brush holder can be prevented reliably, a brush can be slid smoothly and a motor can be operated reliably.

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

  1 is a side view showing a mounting state of a brush holder according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, and FIG. 3 is a plan view of a holder base to which the brush holder is attached. FIG. 4 is a cross-sectional view of the main part of the motor to which the holder base is attached.

  As shown in FIG. 4, the opening 21a of the bottomed cylindrical yoke (housing case) 21 of the motor 20 is closed by a metallic end cover (housing case) 22 made of metal, and the opening 21a. Is fitted with a ring-shaped holder base 23 made of synthetic resin. As shown in FIG. 3, four metal brush holders 10 are attached to the holder base 23 in a cross shape so that the opening 10a faces the central hole 23c.

  As shown in FIGS. 1 and 2, a metal brush holder 10 is a hollow square tube having a U-shaped cross section whose front side is opened by a pair of opposing side pieces 11, 11, a ceiling piece 12, and a rear piece 13. The brush 16 urged toward the commutator 29 by the coil spring 15 is housed and held in such a manner that it can be moved in and out. Further, an L-shaped fixing piece 14 is integrally formed at the center of the end of the pair of side pieces 11, 11 on the side opposite to the ceiling.

  Further, a recess 23d is formed at a position of the other end surface 23b of the holder base 23 facing the front side of the pair of side pieces 11 and 11 of the brush holder 10, and a pair of sides of the brush base 10 of the holder base 23 is formed. A pair of mounting holes 24 and 24 are formed at positions facing the fixed pieces 14 of the pieces 11 and 11 so as to penetrate from the one end surface 23a of the holder base 23 to the other end surface 23b. A recess 25 is formed on the inner side between the pair of fixed pieces 14 and 14 of the brush holder 10 of the recess 23 d formed on the other end surface 23 b of the holder base 23. The recess 25 includes a pair of tapered surfaces 25a and 25a inclined upward from the pair of fixed pieces 14 and 14 toward the center between the pair of fixed pieces 14 and 14, and the pair of tapered surfaces 25a and 25a. And a plane 25b formed therebetween.

  A planar U-shaped opening 12a is formed from the center of the front edge of the ceiling piece 12 of the brush holder 10 to the rear side. A pigtail line 17 connected to the brush 16 moves in the opening 12a. The brush 16 is in contact with a commutator 29 of a motor shaft 28 that is rotatably supported by a bearing 27 at the center of the end cover 22 and a bearing (not shown) at the center of the bottom of the yoke 21. Furthermore, the end of the brush holder 10 on the side opposite to the ceiling of the back piece 13 is fitted in a recess 23 e formed on one end surface 23 a of the holder base 23.

  According to the brush holder mounting structure of the motor 20 of the above embodiment, when the metal brush holder 10 is mounted on the synthetic resin holder base 23, first, the L-shape of the pair of side pieces 11 and 11 of the brush holder 10 is used. Each of the fixed pieces 14, 14 is passed through the pair of mounting holes 24, 24.

  Next, the L-shaped fixing pieces 14 and 14 of the pair of side pieces 11 and 11 are bent at an acute angle by caulking inward so as to face each other at the concave portion 25 of the other end surface 23b of the holder base 23. Each of the fixed pieces 14, 14 is substantially U-shaped. A bent portion (caulking portion) after the fixing pieces 14 and 14 are bent is indicated by reference numeral 14a in the figure.

  The other end surface of the holder base 23 in consideration of the amount of return deformation (spring back) of the bent portions 14a and 14a of the pair of fixed pieces 14 and 14 when the pair of fixed pieces 14 and 14 of the brush holder 10 are bent. The pair of fixing pieces 14, 14 can be preliminarily bent at an acute angle by the recess 25 of 23b. Thereby, the metal brush holder 10 can be reliably attached to the one end surface 23a of the synthetic resin holder base 23, and the attachment failure of the brush holder 10 can be reliably prevented. As a result, the brush 16 can be smoothly slid on the holder base 23 and the motor 20 can be operated reliably.

  As shown in FIG. 4, the motor 20 has a metal end cover 22 brought into contact with the other end surface 23b of the synthetic resin holder base 23 to reduce the overall size and thickness. In consideration of the amount of return deformation of the bent portions 14a and 14a of the pieces 14 and 14, the concave portion 25 as a space where the pair of fixed pieces 14 and 14 can be bent excessively in advance is formed as a concave portion of the other end surface 23b of the holder base 23. By further forming on 23d, the edge surface distance between the metal end cover 22 and the bent portions 14a of the pair of fixing pieces 14, 14 of the metal brush holder 10 can be ensured reliably. Accordingly, it is necessary to interpose an insulating member such as an insulating sheet between the metal end cover 22, the metal end cover 22, and the bent portions 14 a of the pair of fixing pieces 14, 14 of the metal brush holder 10. Therefore, the cost can be reduced accordingly.

  FIG. 5 is a side view showing a mounting state of a brush holder according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line YY in FIG.

  As shown in FIGS. 5 and 6, in this other embodiment, a pair of fixing pieces 14, 14 of the metal brush holder 10 in the recess 23d formed on the other end surface 23b of the holder base 23 'made of synthetic resin. A recess 26 is formed on the inside. The concave portion 26 of the holder base 23 'and the concave portion 25 of the holder base 23 of the above embodiment are different in shape. That is, the concave portion 26 formed in the concave portion 23d of the other end surface 23b of the holder base 23 'made of synthetic resin has a bending fulcrum of the pair of fixed pieces 14, 14 at positions on both sides near the pair of fixed pieces 14, 14. And a flat surface 26b between the pair of convex portions 26a, 26a. In addition, since the other structure is the same as the said embodiment, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted.

  According to the brush holder mounting structure of the motor 20 of the other embodiment, the pair of fixed pieces are located at positions close to the pair of fixed pieces 14 and 14 of the recess 26 of the other end surface 23b of the synthetic resin holder base 23 '. Since the convex portions 26a and 26a serving as folding fulcrums of the fourteen and fourteen are integrally formed, the pair of fixed pieces 14 and 14 are formed on the convex portions on both sides of the concave portion 26 when the pair of fixed pieces 14 and 14 are bent. 26a can be reliably bent into an acute-angled substantially C shape along 26a. Thereby, the return deformation | transformation of each bending part 14a of a pair of fixed pieces 14 and 14 can be prevented reliably, and the attachment defect of the brush holder 10 can be prevented reliably. As a result, the brush 20 can be smoothly slid and the motor 20 can be operated reliably.

  In addition, according to each said embodiment, what formed the L-shaped fixed piece integrally protrudingly formed in the center of the edge part of the anti-ceiling piece side of a pair of side piece of a brush holder was bent and formed at an acute angle, but fixed piece May be formed straight, or a fixed piece may be integrally formed before and after the end of each side piece on the side opposite to the ceiling. Moreover, although the recessed part was formed inside a pair of fixed piece of the brush holder of the other end surface of a holder base, you may form a recessed part in the outer side of a pair of fixed piece, respectively.

It is a side view which shows the attachment state of the brush holder of embodiment of this invention. It is sectional drawing which follows the XX line in FIG. It is a top view of the holder base to which the said brush holder was attached. It is sectional drawing of the principal part of the motor with which the said holder base was attached. It is a side view which shows the attachment state of the brush holder of other embodiment of this invention. It is sectional drawing which follows the YY line in FIG. It is a side view which shows the attachment state of the conventional brush holder. It is sectional drawing which follows the ZZ line in FIG. It is a perspective view which shows the state before attachment of the said conventional brush holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal brush holder 11,11 A pair of side piece 12 Ceiling piece 14,14 A pair of fixed piece 14a Bending part (caulking part)
16 Brush 20 Motor 23, 23 'Resin holder base 23b Other end surface 24, 24 A pair of mounting holes 25a Tapered surface 26 Concave portion 26a Convex portion

Claims (3)

A metal brush holder for retractably storing and holding the brush is formed in a U-shaped cross section with a pair of opposing side pieces and a ceiling piece, and a fixed piece at the end of the pair of side pieces on the side opposite to the ceiling piece Each of the fixed pieces of the pair of side pieces is passed through a pair of mounting holes formed by penetrating from one end surface of the resin holder base to the other end surface, and is passed through the pair of mounting holes. In the brush holder mounting structure of the motor in which each fixing piece is bent at the other end surface side of the holder base so that the brush holder is attached to the holder base.
A brush holder mounting structure for a motor, wherein a recess is formed inside the pair of fixed pieces of the brush holder on the other end surface of the holder base. The brush holder mounting structure for a motor according to claim 1,
A brush holder mounting structure for a motor, wherein a taper surface inclined upward from the pair of fixed pieces to the center between the pair of fixed pieces is formed in the concave portion of the other end surface of the holder base. The brush holder mounting structure for a motor according to claim 1,
A brush holder mounting structure for a motor, wherein convex portions serving as bending fulcrums of the pair of fixed pieces are formed at positions close to the pair of fixed pieces of the concave portions on the other end surface of the holder base.

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