Fte Automotive Gmbh

Fte Automotive Gmbh & Co. Kg

Elmar Kuhn

Stefan Gebert

Jan Gnyp

Matthias Lehnert

Ruthard Braun

Ernst Möller

Ruthart Braun

Johannes Burkard

A central release unit for a hydraulic clutch actuator has a plastic cylinder housing which is produced by injection molding and which has at least one cylinder wall provided, on an outer circumference, with a reinforcement sleeve. The reinforcement sleeve can be fastened to the cylinder wall after the injection molding of the cylinder housing, for which purpose a snap-action connection is provided on a forward end, which faces away from the pressure connection piece, of the reinforcement sleeve. The connection is formed by a radially inwardly bent detent portion of the reinforcement sleeve and by a rib integrally formed on the outer circumference of the cylinder wall. The reinforcement sleeve has a main portion which adjoins the detent portion and which is of conical shape complementary to an outer circumferential surface, which is of conical form in the reinforcement region, of the cylinder wall.

Concentric slave cylinder for a hydraulic clutch actuator

A central release device () is disclosed having a cylinder housing (), with a cylindrical wall (), and a guide sleeve (), which is arranged concentrically therewith and on which an annular piston (), which can be operatively connected to a clutch and can be hydraulically actuated by way of a pressure chamber () defined by the cylindrical wall and the guide sleeve, is displaceably guided. At its end the guide sleeve has an annular flange () with an end face () facing away from the annular piston and a radially outer circumferential surface (), by way of which flange the guide sleeve is fixed to an end face () of the cylinder housing. According to the invention at least one axial groove (), which starts at the end face and in which an insert () is firmly fitted, gripping behind the circumferential surface of the annular flange, is formed in the cylinder housing adjacent to the annular flange, an upper side () of the insert facing away from the annular piston lying in a plane defined by the end face of the annular flange or in front of this plane, viewed from the annular piston. As a result, a central release device of simple design is created which has a relatively short overall axial length.

Central release device for a hydraulic clutch actuation system

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Pfarrweisach, Germany

Elmar Kuhn