| 摘要 |
<p>There is disclosed a hydraulic brake booster comprising a valve spool providing for alternate connection of a booster chamber with a source of pressure-transmitting fluid and an unpressurized return reservoir. The source of pressure-transmitting fluid is a pump-circulated fluid adapted to be throttled by a mechanically actuatable throttle valve arranged coaxially with the valve spool. Since the throttle valve is actuated independently of the pressure in the booster chamber, the need to produce a supply pressure when the brake is not actuated is eliminated. The pump is subjected to load only during the relatively short period of brake activation.</p> |
