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:
Dec. 30, 2014
Filed:
Aug. 27, 2012
Larry D. Diemer, Clarkston, MI (US);
Todd R. Berger, Pinckney, MI (US);
Larry D. Diemer, Clarkston, MI (US);
Todd R. Berger, Pinckney, MI (US);
GM Global Technology Operations, LLC, Detroit, MI (US);
Abstract
A multiple plate friction clutch includes clutch plates or discs having reduced frictional (spin) losses and thus reduced heat generation and improved service life. The clutch plates include both leaf springs or spring tabs at the periphery of the clutch plate that axially bias adjacent plates away from one another and a reduced area of friction material that contacts an adjacent reaction plate. On a typical motor vehicle automatic transmission clutch, a total of six or eight leaf springs or tabs are utilized: with three or four offset to one side and three or four offset to the other side.