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:
Feb. 15, 2005
Filed:
Mar. 28, 2003
Ralf Koberstein, Wartmannsroth-Völkersleier, DE;
Klaus Reuter, Oberthulba-Hetzlos, DE;
Klaus Krappmann, Gochsheim, DE;
Ralf Koberstein, Wartmannsroth-Völkersleier, DE;
Klaus Reuter, Oberthulba-Hetzlos, DE;
Klaus Krappmann, Gochsheim, DE;
ZF Sachs AG, Schweinfurt, DE;
Abstract
A pressure cylinder for a hydraulic actuation device in motor vehicles includes a housing () with an internal cylinder (). A piston () is displaceable in the internal cylinder for forming a pressure space () for a hydraulic fluid. The piston includes a hemispherical socket () in an indentation (). A spring () is arranged in the pressure space (), and a tappet () is connected by a transmission part with a hemispherical cap (). The tappet () is in a frictional and swivelable engagement in the socket () in an indentation () by the force of the spring (). The piston is a deep-drawn, cup-shaped part and includes a filling piece () in the interior of the piston (). An annular space () is disposed at a piston surface () facing toward the pressure space (). The annular space () is for receiving the spring () in a compressed state when the piston () is in a top dead center position.