| 摘要 |
PURPOSE: A master cylinder for a motor vehicle's hydraulic braking system is provided to selectively generate a strong braking pressure with a braking booster by using a simple method. CONSTITUTION: A master cylinder (10) for a vehicle's hydraulic braking system (12) has a housing (18) with a drilling (20) inside it. In the drilling (20) is guided a sealing and movable piston (22) which is mechanically connected to a rod-like actuating member (26) by means of which an input force (F) can be transmitted to the piston (22) for pressure intensification. The piston (22) defines a pressure chamber (28) in the drilling (20) and a compensating chamber (30) on the actuating member side and has a hydraulically active surface (A). For the optional increase in the pressure intensification of the master cylinder (10) there is a device (50) which optionally provides a fluid connection to the pressure chamber (28) and the compensating chamber (30).In the latter case, owing to the smaller hydraulically effective area (B) of the actuating member (26) in relation to the hydraulically effective area (A) of the piston, the pressure intensification of the master cylinder (10) is increased by the factor A/B.
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