Name:     Ralf Kobersteen	Profession:     Inventor
Relationship:	Country:     Wartmannsroth-Volkersleier, Bavaria, DE
http://actuation-hydraulic.banner-trader.com/Patents/vehicles_device_device_in.html Title: Hydraulic actuation device in motor vehicles Abstract: A pressure cylinder for a hydraulic actuation device in motor vehicles includes a housing (1) with an internal cylinder (2,3). A piston (6) is displaceable in the internal cylinder for forming a pressure space (12) for a hydraulic fluid. The piston includes a hemispherical socket (10) in an indentation (9). A spring (18) is arranged in the pressure space (12), and a tappet (7) is connected by a transmission part with a hemispherical cap (8). The tappet (7) is in a frictional and swivelable engagement in the socket (10) in an indentation (9) by the force of the spring (18). The piston is a deep-drawn, cup-shaped part and includes a filling piece (13) in the interior of the piston (6). An annular space (15) is disposed at a piston surface (14) facing toward the pressure space (12). The annular space (15) is for receiving the spring (18) in a compressed state when the piston (6) is in a top dead center position. Patent Number: 6,854,271 Issued on 02/15/2005 to Koberstein, et al. -------------------------------------------------------------------------------- Inventors: Koberstein; Ralf (Wartmannsroth-Volkersleier, DE); Reuter; Klaus (Oberthulba-Hetzlos, DE); Krappmann; Klaus (Gochsheim, DE) Assignee: ZF Sachs AG (Schweinfurt, DE) Appl. No.: 401621 Filed: March 28, 2003 Foreign Application Priority Data -------------------------------------------------------------------------------- Apr 03, 2002[DE] 102 14 599 Current U.S. Class: 60/588 Intern'l Class: B60T 011//26 Field of Search: 188/322.15 267/286-291 60/588 92/170.1,255,169.1,172,129