公开(公告)号：US5826482A

公开(公告)日：1998-10-27

申请号：US757510

申请日：1996-11-27

Applicant: Alexander William Rowe

Inventor： Alexander William Rowe

IPC: B25D9/16 ,  E21B4/14 ,  E21C20060101 ,  F01B11/00 ,  F01L25/04 ,  F15B15/17 ,  F15B15/22 ,  F01B7/18 ,  F01L25/02

CPC classification number: F01B11/00 ,  F01L25/04

Abstract: A hydraulic actuator has a housing, a piston drive chamber in the housing, a fluid inlet into the chamber, and a piston reciprocable in the drive chamber. The piston has diametrical steps exposed to fluid under pressure to cycle the piston. A sleeve spaced from and surrounds over a length of the piston to define a return chamber therebetween. The housing has first and second seats. The first seat and a first surface of the sleeve define an exhaust valve, which has an exhaust port, for the return chamber. The exhaust port is opened and closed by reciprocating the sleeve. The second seat and a second surface of the sleeve an inlet valve for the return chamber. Reciprocating the sleeve opens and closes the return chamber to the drive chamber. The housing also has a bore through which a portion of the sleeve reciprocates to close the exhaust valve and seal the drive chamber. The piston and the sleeve are configured so that they interact hydraulically during cycling to generate hydraulic pressure changes in the return chamber. This reciprocates the sleeve between the exhaust valve and the return chamber inlet valve to cycle the piston. The piston/sleeve configuration also hydraulically cushions the piston as it travels toward the exhaust valve.

Abstract translation: 液压致动器具有壳体，壳体中的活塞驱动室，进入腔室的流体入口以及可在驱动室中往复运动的活塞。 活塞具有在压力下暴露于流体的直径步骤以使活塞循环。 套筒与活塞的长度间隔并围绕活塞的长度，以在其间限定一个返回室。 房屋有第一和第二个座位。 套筒的第一座位和第一表面限定了排气门，该排气阀具有用于返回室的排气口。 排气口通过套筒往复运动而打开和关闭。 第二座椅和套筒的第二表面是用于返回室的入口阀。 往复运动的套筒打开和关闭返回室到驱动室。 壳体还具有孔，套筒的一部分通过该孔往复运动以关闭排气阀并密封驱动室。 活塞和套筒被构造成使得它们在循环期间以液压方式相互作用以在返回室中产生液压变化。 这使得排气阀和返回室入口阀之间的套筒往复运动以使活塞循环。 当活塞/套筒构件向排气阀行进时，活塞/套管构造还液压地缓冲活塞。