| 摘要 |
A master cylinder (10) for a vehicle hydraulic braking system (12) has a housing (18) with a bore (20) formed therein. A piston (22) is guided in a sealing and displaceable manner in the bore (20) and is mechanically connected to a rod-like actuating element (26), by means of which an input force (F) can be transmitted to the piston (22) for pressure conversion. In the bore (20), the piston (22) bounds a pressure chamber (28) and a replenishing chamber (30) arranged on the actuating element side, and has a hydraulically active area (A). In order selectively to increase the pressure intensification of the master cylinder (10), a device (50) is provided which selectively provides a fluid connection between the pressure chamber (28) and the replenishing chamber (30). In the last-mentioned state, on account of the hydraulically active area (B) of the actuating element (26) being smaller than the hydraulically active area (A) of the piston (22), the pressure intensification of the master cylinder (10) is increased by the factor A/B.
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