| 摘要 |
<p>A brake actuator has a body (8) containing a pair of brake-applying members (l0, ll) which may be actuated hydraulically to separate the friction elements of a brake into engagement with a rotatable braking surface. The members (l0, ll) are interconnected by a mechanism in the form of a shaft (l2) of which respective end portions (l3, l4) are provided with reversible threaded portions of opposite hand which engage corresponding threads (l0A, llA) within the members (l0, ll), the shaft being constrained against axial movement between bearings (l6, l7). Any excess movement of one of the members relative to the other is transmitted to that other member such as to cause an opposite proportional, usually equal, movement of said other member, irrespective of forces arising from servo effects in the brake.</p> |
