Patent ID: 8193682

Claim:
An alternator for vehicles, comprising: a rotary shaft; two slip rings fixed to the rotary shaft to be rotated together with the rotary shaft; two brushes placed to be in slide contact with the slip rings; a brush holder that accommodates the brushes to be held therein, the brush holder being made of thermosetting resin; positive-side and negative-side connection terminals fixed to the brush holder; two brush leads electrically connecting the brushes and the connection terminals, respectively; and a slip ring cover that covers the slip rings in cooperation with the brush holder, wherein the brush holder is shaped to have a pair of first chambers in which the brushes are accommodated, respectively, a pair of second chambers in which the brush leads are accommodated, respectively, and two first air holes each having two ends, one end thereof being directly open to a corresponding one of the second chambers and the other end thereof being directly open outside at a face of the brush holder.