Brush holder and manufacturing method thereof
View Patent ↗A brush holder incorporates a terminal integral part, which has a coupling portion. The coupling portion couples the terminals with each other. The brush holder has a resin body and a plurality of terminals. The resin body has an opening. The terminals are embedded in the resin body. The terminals are coupled to each other by the coupling portion as an integral part before being embedded in the resin body. The coupling portion is exposed from the opening of the resin body. The terminals are separated from each other by cutting the coupling portion, which is exposed from the opening of the resin body. A coating member coats the opening of the resin body to insulate each terminal.
1. A brush holder, which is attached to the motor housing to close an opening of the motor housing and retains a brush, the brush holder comprising:
a resin body forming at least part of the brush holder, wherein the resin body has an opening;
a plurality of terminals embedded in the resin body, wherein the terminals are coupled to each other by a coupling portion so as to form an integral part before being embedded in the resin body, wherein the coupling portion is exposed from the opening of the resin body, and wherein the terminals are separated from each other by cutting the coupling portion, which is exposed from the opening of the resin body;
a sealing member provided on the resin body, the sealing member sealing the opening of the motor housing when the brush holder is attached to the motor housing; and
a coating member for insulating the separated terminals from each other, wherein part of a material of the sealing member fills the opening of the resin body to form the coating member.
2. The brush holder according to claim 1 , wherein the sealing member is molded integrally with the resin body.
3. The brush holder according to claim 1 , wherein the sealing member is formed of elastic material.
4. The brush holder according to claim 3 , wherein the elastic material is elastomer.
5. The brush holder according to claim 1 , further comprising a main body, which is located inside the motor housing and retains the brush, an extended portion, which extends from the main body to the outside of the motor housing, and a connector portion, which is exposed outside the motor housing from the extended portion, wherein the coupling portion is located at a position corresponding to at least one of the extended portion and the connector portion.
6. The brush holder according to claim 1 , further comprising a main body, which is located inside the motor housing retains the brush, an extended portion, which extends from the main body to the outside of the motor housing, and a connector portion, which is exposed outside the motor housing from the extended portion, wherein the coupling portion is one of coupling portions located at positions associated with at least two of the positions corresponding to the main body, the extended portion, and the connector portion.
7. The brush holder according to claim 1 , wherein the coupling portion is one of a plurality of coupling portions, and wherein the coupling portions are exposed from the opening of the resin body.
8. The brush holder according to claim 7 , wherein the coupling portions are cut at once.
9. The brush holder according to claim 1 , wherein the motor housing includes a yoke housing and a gear housing, wherein the yoke housing forms part of a motor main body, which rotates a rotary shaft, wherein the gear housing accommodates a reduction mechanism, which is assembled to the yoke housing and reduces rotation of the rotary shaft, wherein the brush holder is held and fixed between the yoke housing and the gear housing, and wherein the opening of the resin body and the coating member are located at a portion of the brush holder, which is held between the yoke housing and the gear housing.