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:
Mar. 22, 1994
Filed:
Apr. 05, 1993
Michael D Bradfield, Anderson, IN (US);
David L Wright, Pendleton, IN (US);
Thomas R Sowash, Anderson, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A ventilated brush holder for an alternating current generator. The brush holder has a tubular shield portion, a brush holding portion and a bearing retainer portion. The shield portion encloses the slip rings of the rotor of the generator. The brush holding portion has bores that are open to the interior of the shield portion. Brushes are located in the bores that project into the shield portion and engage the slip rings. The bearing retaining portion is disposed between and engages an internal surface of an opening in the frame of the generator and an outer surface of the outer race of a ball bearing for the rotor shaft. The bearing retainer portion has a plurality of circumferentially spaced and axially extending slots that form air passages. A fan is driven by the rotor shaft and when it is rotated, air is caused to flow through the shield portion and then through the slots in the bearing retainer portion. This flow of air cools the brushes and the bearing and carries away brush dust. Moisture contained in the air tends to promote the creation of a brush dust film on the slip rings.