Lucas Industries Limited

Hartmut Unterberg

Martin Struschka

Hans-Christoph Lange

Peter Linde

A master cylinder includes a restraining device arranged between the first and second pistons for preventing the return spring from being compressed and expanded beyond a certain extent. The restraining device includes a first, substantially sleeve-shaped component and a second, substantially pin-shaped component. The pin-shaped component includes a flange which projects radially outwards. The sleeve-shaped component includes a first receiving flange which positively interacts with the flange of the pin-shaped component. The sleeve-shaped component includes at least one introduction opening which enables the flange on the pin-shaped component to be laterally introduced into the sleeve-shaped component. The end of the sleeve-shaped component includes a second receiving flange which positively interacts with a flanged projection on the second piston which projects radially outwards. The sleeve-shaped component includes the at least one introduction opening which enables the flange provided on the second piston to be laterally introduced into the sleeve-shaped component.

Master cylinder for a hydraulic vehicle braking system with improved return spring restraining

A master cylinder (10) for a hydraulic vehicle braking system comprises a housing (12) which has a bore (14) extending along a longitudinal axis (A), whose one end is closed by an end wall associated with the housing (12) of the master cylinder (10) and whose other opposite end is sealingly closed by a closure element (16). In the bore (14) adjacent to the closure element (16) a piston (18) is accommodated sealingly and axially movable which can be actuated through same, which has a central valve (20) which enables a fluid connection between a fluid reservoir and a pressure chamber (28) which is defined in the bore (14) by the end wall and the piston (18). When the piston (18) is not actuated, the central valve (20) is held in the open position by means of an abutment member (transverse pin 34) acting on the closure element (16). In order to ensure a defined opening point with respect to the piston (18) even then when the central valve (20) is to open against an overpressure, the closure element (16) consists of an annular elastomeric part (42) which faces towards the pressure chamber (28) and of a detachably connected and axially succeeding part (44) made form rigid material which is also designed annularly. For the generation of a quasi-rigid stop the part (44) made from rigid material comprises an annular circumferential projection (46), which is integrally formed with same whose maximum cross-sectional dimension amounts to not more than approximately half of the cross-sectional dimension of the elastomeric part (42), and which penetrates the elastomeric part (42) completely or nearly completely in an axial direction.

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Koblenz, Germany

Hartmut Unterberg