Patent ID: 7211911

Claim:
An automotive alternator comprising: a rotor connected to a rotor shaft having slip-rings formed at a rear end thereof; a brush device having brushes slidably contacting the slip-rings for supplying field current to the rotor; a cover-member covering the brush device and the slip rings; a rear bearing box holding a rear bearing that rotatably supports the rotor shaft; a rear frame having a rear end wall positioned between a front surface of the cover member and a rear surface of the rear bearing box, the rear end wall having a center opening through which a rear end of the rotor shaft extends; and a vibration-absorbing member disposed between the rear end wall of the rear frame and the cover member, wherein: the cover member having an extending cylindrical portion positioned in the center opening of the rear end wall, forming a cylindrical space therebetween; and the vibration-absorbing member is made of rubber and includes a cylindrical portion tightly filling the cylindrical space and a rear disc portion compressed between the front surface of the cover member and the rear end wall of the rear frame.