| 摘要 |
<p>A vehicle brake system in which an output member is axially displaceable by the application of differential fluid pressure, under the control of a valve operable by an input member, across a movable internal wall which divides a housing of the booster into a pair of fluid chambers. Displacement of the movable wall is communicated to the output member via a lever mechanism providing a mechanical advantage between said movable wall and the output member. The lever mechanism comprises first and second levers. The second lever is pivotable relative to the input and output members at respective pivot points. The first lever is pivoted to the second lever, with the movable wall acting on one end of said first lever and the other end thereof co-operating with the housing such that, upon a predetermined displacement of the movable wall, the first lever is pivoted and its displacement is transmitted with mechanical advantage to the output member via the second lever, the second lever simultaneously transmitting a reaction force to the input member.</p> |
