| 摘要 |
<p>A spring-applied brake actuator has an output member (20) movable from a "brake released" position to a "brake applied" position in which an output braking force can be applied through the output member (20), and a braking force generating spring (5) for generating the output braking force to be applied to the output member (20) when in its "brake-applied" position. The output member (20) is constituted by a piston and there is provided first means (8/10) for applying a fluid pressure such that the spring (5) is withheld from generating said output braking force in the "brake released applied" condition of the actuator, and second means (11/13/16/22/23/24) for applying this fluid pressure to the output member (20) to move it into its "brake applied" position before the braking force generating spring (5) is allowed to generate the output braking force to be applied through the output member (20).</p> |
