| 摘要 |
<p>The present invention relates to actuator (11) comprising a piston (16) with a cylinder (17). The piston (16) divides the cylinder (17) with at least two chambers. An orifice (53) is provided in an end surface of the cylinder (17). The said end surface and the nearest piston surface are shaped so that as the piston (16) approaches the said end surface the flow of fluid from between the said end surface and the said piston surface to the orifice is restricted. Preferably the end surface and the piston (16) define between them two subchambers (54, 57) and an interconnecting passage (58) for the last portion of motion of the piston (16) towards the end surface. The passage (58) decreases in size as the piston (16) approaches the end surface and increasingly restricts flow of fluid between the two subchambers (57, 54).</p> |
