Patent ID: 9000634
Filing Date: 2015-04-07
Classification: H02K

Abstract:
1. A motor with speed reduction mechanism, comprising: a yoke having a bottom surface; a magnet formed with at least four poles in which different magnetic poles are alternately disposed on an inner peripheral surface of the yoke; an armature including an armature shaft which has one end rotatably supported by a bottom portion of the yoke, a commutator which is fixed to the armature shaft, and a core which is fixed to the armature shaft and around which a winding wire is wound, wherein the armature is rotatably disposed on an inner side of the magnet; at least two brushes slidably contacting with the commutator; brush holders on which the at least two brushes are mounted; a gear housing formed into a bottomed open shape and formed with a speed reduction mechanism accommodating part having accommodated therein a speed reduction mechanism engaged with a worm formed on the armature shaft; and a gear housing cover covering the opening of the gear housing, a control board being mounted on a bottom portion of the gear housing cover, wherein a first heat dissipating member is formed at a back surface of the speed reduction mechanism accommodating part of the gear housing, at least said two brushes are disposed in the vicinity of the first heat dissipating member so that heat generated from the brushes is transmitted to the first heat dissipating member, brush holder abutting parts respectively abutting on the brush holders via heat conducting members are formed so as to protrude from a bottom portion of a brush holder accommodating part of the gear housing, and heat generated from the brushes is transmitted to the brush holder abutting parts, and dissipated from the first heat dissipating member to the outside of the gear housing.