Slave cylinder for a hydraulic actuating system of a motor vehicle friction clutch

US5211099A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Wolfgang Grosspietsch · Schweinfurt, DE
• Gottfried Mader · Ebelsbach, DE
• Herbert Voit · Schweinfurt, DE
• Karl Muller

Key dates

• Filing date: Mar 19, 1992
• Grant date: May 18, 1993
• Expiry date: Mar 19, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D25/083
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A slave cylinder of the annular cylinder type is proposed, whereof the annular piston (45) able to slide axially between an outer cylinder wall (29) and an inner cylinder wall (33) is sealed by a grooved sealing ring (53) with respect to the pressure chamber (37). In order to be able to evacuate by means of a suction pump a hydraulic actuating system for a motor vehicle friction clutch, constructed using a slave cylinder of this type, before filling with hydraulic fluid, means are provided on the annular cylinder or in addition to the sealing lips (57) on the grooved sealing ring, which increase the sealing action of the sealing lips (57) when applying a vacuum to the hydraulic pressure chamber (37). The said means may be conical surfaces (61, 63) on the cylinder walls or a conical ring engaging in an annular groove (59) of the sealing ring (53). Additional sealing beads having a cross-sectional contour in the shape of a circular sector may be formed if necessary on the grooved sealing ring.