JP2008220079A - Brush holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush holder which can easily push out a brush, toward the inside from the side of the opening of a bracket and can surely make the brush abut against a commutator certainly, even when arranging the annular member of the brush holder on the side of the opening of the bracket and assembling a starter motor. <P>SOLUTION: A guide part 3, which opens in its inner perimetrical and peripheral directions, is made at an annular member 2, consisting of an insulator and is equipped with a brush 4 which can slide in its inner perimetrical and peripheral directions of the annular member 2, inside the guide member 3. The brush 4 can fix and keep its position inside and outside the guide member 3. A cut 16 is made at the peripheral edge of the annular member 2, at a position where the guide member 3 is made, and the cut 16 is made, in a state of being cut off in its inner perimetrical direction, up to a position which goes over the outer end of the brush 4, in condition that the above brush 4 is positioned outside the guide 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brush holder provided with a brush for passing a current to a commutator of a starter motor.

  When starting the engine of the saddle riding vehicle by the cell starter, electric power is supplied from the starter relay to the starter motor, and the crankshaft is rotated by the rotation of the starter motor. Electric power is supplied to the starter motor from a lead wire from the cell starter to a terminal provided in the starter motor.

  In this case, the brush holder is assembled to the bracket of the starter motor, the brush provided in the brush holder is brought into contact with the commutator in the bracket, and power is supplied to the brush. Such a brush holder unit is described in Patent Document 1. This brush holder unit reduces the man-hours for assembling the brush holder unit and improves the assembling position accuracy.

JP 2003-23746 A

  However, the brush holder unit of Patent Document 1 is provided with a brush on the opening side of the bracket. Therefore, at the time of assembling the starter motor, it is possible to easily perform the work of attaching the brush holder and bringing the brush into contact with the commutator. That is, since the brush is assembled so as to be positioned on the opening side of the bracket, the operator can push the brush toward the inside of the annular member while visually observing the brush and abut the commutator.

  On the other hand, when the brush is assembled so as to be positioned on the bottom side of the bracket, the annular member that is the substrate of the brush holder is positioned on the opening side of the bracket, so that the brush is visually observed from the opening of the bracket when the starter motor is assembled. In addition to being unable to do so, it is impossible to perform the work of making the brush contact the commutator by being blocked by the annular member.

  The present invention takes the above-described prior art into consideration, and even when the annular member of the brush holder is disposed on the opening side of the bracket and the starter motor is assembled, the brush can be easily brought inward from the opening side of the bracket. It is an object of the present invention to provide a brush holder that can be pushed out and can reliably bring the brush into contact with the commutator.

  In order to achieve the above object, according to the first aspect of the present invention, an annular member made of an insulator is provided with a guide portion that opens in the inner and outer circumferential directions, and the inside of the guide portion is slid in the inner and outer circumferential direction of the annular member. A movable brush is provided, and the position of the brush can be fixedly held inside and outside the guide portion, and a notch portion is provided on the outer peripheral edge of the annular member at the position where the guide portion is formed. The brush holder is formed, and the notch portion is formed by being notched in the inner circumferential direction to a position beyond the outer end portion of the brush in a state where the brush is located outside the guide portion. I will provide a.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a stepped portion formed in a step shape is provided at a corner portion of the outer end portion of the brush on the side of the notch portion.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the outer peripheral edge of the annular member is clamped and held between a yoke and a bracket of a starter motor, and the outer peripheral edge of the annular member is A convex part protruding in the yoke direction is formed, and a concave part into which the convex part can be fitted is formed in the yoke, and the fitting depth of the convex part and the concave part is at least that of the annular member. It is characterized by being at least twice the thickness.

  According to invention of Claim 1, a notch is formed in the outer periphery of the annular member in the position in which the guide part was formed, and this notch is a brush with the brush located outside the guide part. It is formed by being cut out in the inner circumferential direction up to a position beyond the outer end of the inner wall. Accordingly, even when the brush holder is attached to the bracket with the brush on the bottom side of the bracket, that is, with the annular member on the opening side of the bracket, the brush can be easily pushed out through the notch. For this reason, a brush can be made to contact | abut to a commutator reliably.

  According to the invention of claim 2, since the stepped portion formed in a step shape is provided at the notch portion side of the outer end portion of the brush, that is, the corner portion of the brush visible from the notch portion, When extruding, a tool or the like can be brought into contact with the stepped portion, and the work can be facilitated and a reliable extruding operation can be realized.

  According to the invention of claim 3, since the concave portion and the convex portion are formed in the yoke and the annular member, and these are fitted and joined to each other, the assembly work of the bracket can be reliably performed at an accurate position. . Moreover, since this fitting depth is at least twice the thickness of the annular member, the depth is relatively deep, so that the operator can reliably recognize that both members are fitted. be able to.

  In the present invention, an annular member made of an insulator is provided with a guide portion that is open in the inner and outer circumferential directions, and a brush is provided in the guide portion that can slide in the inner and outer circumferential directions of the annular member. The inner and outer sides of the guide part can be fixed and held, and a notch is formed on the outer periphery of the annular member at the position where the guide part is formed. In a state where the brush is located outside the guide portion, it is formed by being cut out in the inner circumferential direction to a position beyond the outer end portion of the brush, and a brush holder is mounted by arranging an annular member on the opening side of the bracket. Even in this case, the brush holder can easily push the brush inward through the notch, and can reliably bring the brush into contact with the commutator.

  FIG. 1A is a front view of a state before pushing out a brush provided in a brush holder according to the present invention, and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 2A is a bottom view of the brush holder, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. FIG. 3A is a front view showing a state after the brush of the brush holder according to the present invention is pushed out, and FIG. 3B is a cross-sectional view taken along the line CC in FIG. 4A is a schematic front view when the brush holder is attached to the rear bracket, and FIG. 4B is a cross-sectional view taken along the line DD in FIG. 5A is a sectional view of the yoke, and FIG. 5B is a view taken along line EE of FIG.

  A brush holder 1 according to the present invention includes an annular member 2 made of an insulator and a plurality of guide portions 3 (four in the figure) arranged on the surface thereof. The guide portion 3 has a substantially rectangular tube shape opened in the inner and outer peripheral directions of the annular member 2, and the brush 4 is slidably disposed therein. As shown in FIG. 1, the brush 4 is urged from one side by a spring 5 at a position outside the guide portion 3 and pressed against the other inner wall of the guide portion 3 to fix and hold the position. Is done.

  A substantially semicircular copper plate 6 is fixed to the back surface of the annular member 2 by rivets 7. The copper plate 6 is electrically connected by a plurality of (two in the figure) brushes 4 and pigtails 8. Power is supplied to the copper plate 6 from a bolt 11 that passes through the rear bracket 9. As shown in FIG. 4, the bolt 11 is tightened with a nut 15 with respect to the rear bracket 9. A metal ground member 12 is sandwiched between the outer edges of the annular member 2. This ground member 12 is electrically connected to a brush other than the brush 4 connected to the copper plate 6 and the pigtail 8. The ground member 12 is sandwiched and fixedly held between a rear bracket 9 and a yoke 13 constituting a starter motor 14 to be described later, and is grounded.

  The brush holder 1 is disposed such that the opening side of the rear bracket 9 is the back surface of the annular member 2. Therefore, when the brush holder 1 is mounted on the rear bracket 9, the back surface side of the annular member 2 faces as shown in FIG. Thereafter, in order to bring the brush 4 into contact with the commutator 26 (see FIG. 6) located at the axial center of the rear bracket 9, an operation of pushing the brush 4 inward is performed.

  A cutout portion 16 is formed on the outer peripheral edge of the annular member 2 and the ground member 12 at the position where the guide portion 3 is formed. The notch 16 is formed by being notched in the inner circumferential direction up to a position beyond the outer end of the brush 4 with the outer edge of the brush 4 positioned outside the guide 3. Therefore, when the brush holder 1 is attached to the rear bracket 9, the armature is inserted, and the brush 4 is pushed out, the rear end portion of the brush 4 can be seen from the notch portion 16. The operator can easily and reliably move the brush 4 inward by inserting a tool or the like into the notch 16 and pushing the rear end of the brush 4.

  A stepped portion 17 is formed in a step shape at the corner of the brush 4 on the side visible from the notch 16. Accordingly, when the brush 4 is pushed inward, a tool or the like can be brought into contact with the stepped portion 17 and pushed out, so that the work becomes easy and a reliable push-out work can be realized.

  At the same time as the brush 4 is pushed out, the spring 5 urged from the side surface direction moves to the rear end side of the brush 4 through the notch provided on the side surface of the guide portion 3, and urges the brush 4 inward again. (See FIG. 3). Thereby, the brush 4 is fixedly held by the spring 5 in a state of being located inside the guide portion 3. Therefore, the brush 4 can reliably hold the state in contact with the commutator 26 (see FIG. 6).

  As shown in FIG. 5, the yoke 13 has a substantially cylindrical shape, and a plurality of (four in the figure) magnets 18 which are permanent magnets are fixed inside. A recess 19 is cut out at the rear end of the yoke 13 (right side in FIG. 4). On the other hand, the ground member 12 is formed by bending a part of its periphery in the direction of the back surface to form a convex portion 20 (see FIG. 2B). As described above, since the brush holder 1 is clamped and fixed between the rear bracket 9 and the yoke 13, the concave portion 19 and the convex portion 20 are fitted to each other at the time of clamping to facilitate positioning of the both. And it can carry out reliably (refer FIG. 6). Therefore, the assembling work of the rear bracket 9 with respect to the yoke 13 can be easily and reliably performed. In addition, although the example which formed the convex part 20 in the earth member 12 was shown in the figure, you may form in the annular member 2. FIG.

  The fitting depth between the concave portion 19 and the convex portion 20 is at least twice the thickness of the annular member. For this reason, since the depth is comparatively deep, the operator can surely recognize that both members are fitted. Therefore, it is possible to prevent the yoke 13 and the rear bracket 9 from being assembled in an incorrect state.

  FIG. 6 is a partial cross-sectional view of the starter motor to which the brush holder is attached.

  As shown in the figure, the starter motor 14 includes a front bracket 21, a yoke 13, and a rear bracket 9. A plurality of magnets 18 are fixed to the inner peripheral surface of the yoke 13 to form a stator. A rotor 22 is disposed inside thereof. The rotor 22 is obtained by forming a coil 25 on a core 24 fixed to a starter gear 23 serving as an axis of the starter motor 14 by winding. This winding is connected to the commutator 26. The starter gear 23 is supported by bearings 27 and 28 provided in the front bracket 21 and the rear bracket 9. Electric power is supplied to the motor from the lead wire 29 to the bolt 11, the brush 4, and the commutator 26 in the terminal 10 covered with the cap 30. Reference numeral 32 denotes an attachment portion for attaching the starter motor 14 to the vehicle body. In addition, the rear bracket 9 and the yoke 13 are securely positioned and fitted by the concave portion 19 and the convex portion 20.

It is a front view of the state before pushing out the brush with which the brush holder which concerns on this invention is extruded, (B) is AA sectional drawing of (A). (A) is a bottom view of a brush holder, (B) is a BB sectional view of (A). (A) is a front view of the state after extruding the brush of the brush holder which concerns on this invention, (B) is CC sectional drawing of (A). (A) is a front schematic diagram when a brush holder is attached to a rear bracket, and (B) is a DD cross-sectional view of (A). (A) is sectional drawing of a yoke, (B) is the EE view of (A). It is a partial cross section figure of a starter motor with which a brush holder was attached.

Explanation of symbols

1: brush holder, 2: ring member, 3: guide part, 4: brush, 5: spring, 6: copper plate, 7: rivet, 8: pigtail, 9: rear bracket, 10: terminal, 11: bolt, 12 : Ground member, 13: yoke, 14: starter motor, 15: nut, 16: notch, 17: step, 18: magnet, 19: recess, 20: protrusion, 21: front bracket, 22: rotor, 23: Starter gear, 24: Core, 25: Coil, 26: Commutator, 27: Bearing, 28: Bearing, 29: Lead wire, 30: Cap, 31: Palace terminal, 32: Mounting part

Claims (3)

An annular member made of an insulator is formed with a guide portion that is open in the inner and outer circumferential directions,
A brush that can slide in the inner and outer peripheral directions of the annular member is provided in the guide portion,
The brush is capable of fixing and holding the position inside and outside the guide portion,
A notch is formed on the outer periphery of the annular member at the position where the guide is formed,
The notch portion is formed by notching in the inner circumferential direction to a position beyond the outer end portion of the brush in a state where the brush is located outside the guide portion.   The brush holder according to claim 1, wherein a stepped portion formed in a step shape is provided at a corner of the outer end portion of the brush on the side of the notch.   An outer peripheral edge of the annular member is sandwiched and held between a yoke and a bracket of a starter motor, and a convex portion protruding in the yoke direction is formed on the outer peripheral edge of the annular member. The concave portion capable of fitting the convex portion is formed by notching, and the fitting depth of the convex portion and the concave portion is at least twice the thickness of the annular member. Or the brush holder of 2.

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