The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 06, 1994
Filed:
Jun. 23, 1993
Susumu Sasaki, Hitachi, JP;
Hisashi Wada, Hitachi, JP;
Takashi Oguri, Hitachi, JP;
Susumu Terumoto, Hitachi, JP;
Akihiro Saito, Hitachi, JP;
Hitachi Automotive Engineering, Tokyo, JP;
Hitachi, Ltd. and Co., Ltd., Ibaraki, JP;
Abstract
An object of the invention is to, in a vehicular alternating current (AC) dynamo, reduce an influence of vibration on a brush during operation, thereby preventing the brush from wobbling, cracking or causing other damages, also to make the brush sufficiently exposed to cooling air during operation, thereby preventing the brush temperature from rising excessively. In the vehicular AC dynamo, by virtue of a pressing force produced upon a tubular cover integral with a fan guide being fixed to a rear bracket through a seal member, an abutting end surface of a projection of the tubular cover is axially abutted with an inner abutting surface of a recess of the brush holder for pressing and fixing said brush holder against and to the rear bracket. In addition, the side of the fan guide and the side of the brush holder are arranged to be flush with each other, and a labyrinth seal structure is constituted by a circumferential groove of an end flange and a cylindrical projection which is formed by both the tubular cover and the brush holder.