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:
Jun. 12, 2001
Filed:
Oct. 21, 1999
Applicant:
Inventors:
Ludwig Winkelmann, Erlangen, DE;
Gerhard Meyer, Lehrberg, DE;
Bernd Liebezeit, Oberreichenbach, DE;
Gerhard Prosch, Höchstadt/Aisch, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16D 2/508 ;
U.S. Cl.
CPC ...
F16D 2/508 ;
Abstract
A hydraulically operated central release unit for a motor vehicle clutch is designed as a slave cylinder that is arranged inside a clutch housing. The central release unit includes a housing in which a ring piston is movably guided. The ring piston has a groove ring seal with lips sealingly contacting the sealing tracks. To reduce the wear on the sealing lips and to avoid squeaking noises of the groove ring seal, the surfaces of the sealing tracks are provided with micro cavities.