| 摘要 |
A fluid-operated power booster includes a housing (12) having a main piston (10) slidably mounted therein and a regulating chamber formed in the main piston. A regulating piston (22) is mounted within the regulating chamber and is fixed to an input shaft (24). The input shaft and regulating piston in a first direction permits the flow of working fluid into both a working chamber and regulating chamber (18), while movement of the input shaft in a second direction causes working fluid to be exhausted from the working chamber. The regulating piston is biased by a mechanical spring (28) whose force must be overcome to inititate movement of the regulating piston and thereby the flow of working fluid to achieve booster action. The output of the device is by way of an output shaft (30) connected to the main piston.
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