Lucas Automotive Gmbh

Zf Active Safety Gmbh

Michael Geider

Martin Struschka

Ludwig Friedsam

The invention relates to a brake master cylinder arrangement for a motor vehicle brake system, comprising at least one piston arrangement with: a pressure piston unit that can be moved along a movement axis (V) and, together with a housing arrangement of the brake master cylinder arrangement, defines a pressure chamber; and a force input member that can be moved according to the actuation of the brake pedal and is coupled, or can be coupled, to the pressure piston unit so as to move therewith, the brake master cylinder also comprising: a position transmitter element that can be moved according to the actuation of the force input member; a detection unit designed to detect a movement of the position transmitter element; and a coupling arrangement designed to couple the position transmitter element to at least one element of the piston arrangement in a substantially rigid manner, along the movement axis (V), the coupling arrangement also being designed to allow a rotation of the at least one element of the piston arrangement in relation to the position transmitter element about the movement axis (V).

Brake master cylinder arrangement with position transmitter element and coupling arrangement therefor

A master cylinder for a vehicle hydraulic brake system has a housing with a bore formed therein, which is open at one end and in which a first pressure piston and a second pressure piston are guided sealingly and displaceably along an axis. Acting counter to an actuating direction upon the first pressure piston is a restrained first restoring spring and upon the second pressure piston a second restoring spring. In order, in a transportation or disassembly state of the master cylinder, to prevent the first pressure piston from being pressed excessively out of the bore, the second pressure piston is supported by means of a stop component counter to the actuating direction positively in the housing of the master cylinder.

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Urmitz, Germany

Michael Geider