| 摘要 |
PCT No. PCT/US80/00782 Sec. 371 Date Jun. 23, 1980 Sec. 102(e) Date Jun. 23, 1980 PCT Filed Jun. 23, 1980 PCT Pub. No. WO82/00045 PCT Pub. Date Jan. 7, 1982.A rotary actuator (11) having a vane (24) which is pivoted in a chamber (13) by fluid pressure to turn an actuator shaft (18) includes internal sump cavities (41A, 41B) that collect abrasive particles from the fluid and which hold such contaminants away from the path of movement of the vane (24). Shields (49A, 49B) protect the sumps (41A, 41B) from fluid turbulence. A magnetic element (47A, 47B) at each sump (41A, 41B) attracts and holds ferromagnetic particles and may be removed for cleaning without a general disassembly of the actuator (11) and with only a minimal draining of fluid. Actuator (11) durability is increased by reducing wear of moving components and maintenance is facilitated by simplifying cleaning. Among other uses, the invention may be employed in actuators (11) which swing a backhoe (34) relative to a supporting vehicle (32).
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