Patent ID: 7417353
Filing Date: 2008-08-26
Classification: H02K

Abstract:
1. An alternator to be mounted on a vehicle, comprising: slip rings fixed on a rotary shaft and rotatable together with the rotary shaft; brushes slidable on the slip rings; a brush holder having a brush accommodating portion in which the brushes are accommodated, and having both sides in an axial direction of the rotary shaft, one of the sides having a through hole communicating the brush accommodating portion to an outside of the alternator; a slip-ring cover covering the slip rings as well as the brush holder; and a rear cover covering electronic components including the brushes and having a first air-ventilating port for communicating between an inner space containing slid portions of the brushes on the slip rings and the outside of the alternator and a second air-ventilating port for communicating between the brush accommodating portion and the outside of the alternator via the through hole of the brush holder.