| 摘要 |
A hydraulic brake system for automotive vehicles provided with a hydraulic power booster (1) and with a master cylinder (10) operable by the power booster (1). The booster piston (2) is designed as stepped piston with a pedal-close portion (5) of smaller diameter and with a pedal-remote portion (6) of larger diameter. Together with a housing (11), the annular surface (12) of the booster piston (2) at the piston step encloses an annular space (13) of variable volume. The annular space (13) communicates with an unpressurized supply reservoir (22), which communication may be locked, and wherein in a pedal-remote pocket bore (7) of the booster piston (2) a master cylinder piston (8) confining a working chamber (17) is guided in a sealed manner. An annular chamber (14) confined by the pedal-remote annular surface of the booster piston (2) is pressurizable by the pressure of an auxiliary pressure source. A hydraulic communication is establishable between the annular chamber (14) and the working chamber (17) by way of a non-return valve (57) which opens towards the working chamber (17). With respect to a prefill of the brake system at the beginning of the braking operation a double-seat valve (41) between the annular chamber (14) and the unpressurized supply reservoir (22). The double-seat valve (41) temporarily adopts a locking position at the beginning of the braking operation.
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