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:
Jul. 29, 1997
Filed:
Oct. 02, 1995
Glenn Eric Meeusen, Racine, WI (US);
Twin Disc, Incorporated, Racine, WI (US);
Abstract
A transmission gear train has a clutch designed to minimize shift shock upon engagement while still exhibiting relatively rapid initial engagement. To this end, a face cavity is formed in the clutch actuating piston which acts as an accumulator into which hydraulic fluid flows for a period of time after initial clutch engagement. This fluid flow causes clutch pressure to be lower than system main pressure while the accumulator is filling, thereby providing a cushioning effect which reduces shift shock. Use of the accumulator or face cavity eliminates the need for a stepped piston and the additional seals and flow passages normally required for a stepped piston, thus simplifying clutch manufacture and operation.