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:
May. 30, 2006
Filed:
Nov. 04, 2003
Joseph Hessell, Canton, MI (US);
Michael J. Gorman, Pinckney, MI (US);
Joseph Hessell, Canton, MI (US);
Michael J. Gorman, Pinckney, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An apparatus for applying and releasing a clutch piston in a clutch cylinder against a return spring includes a fill oil chamber having first and second portions separated by a fill piston. The first portion is in fluid communication with the clutch cylinder through a first passage, and the second portion is in fluid communication with a second passage. A third passage is in fluid communication with the first passage. A fill control valve is operative to alternately communicate the second passage to a transmission line pressure passage or an exhaust passage. The fill control valve is further operative to alternately communicate the third passage to a controllable source of pressurized oil having a signal pressure, or to close the third passage.