| 摘要 |
A hydraulically powered rotary actuator (32) for rotating a first portion (14) of a work machine (10) relative to a second portion (12) of the work machine (10) has inner and outer rings (36, 96, 38, 98) enclosed by first and second cover plates (42, 104, 44, 106). The inner and outer rings (36, 96, 38, 98) are spaced apart to define a hydraulic power chamber (56, 98) to which pressurized fluid is supplied to rotate one of the inner or outer rings (36, 96, 38, 98). The first portion (14) of the work machine (10) is connected to the rotatable ring (36, 96) and rotates with it. A large diameter bearing assembly (40, 110) rotatably supports the rotatable ring (36, 96) and the first portion (14) of the work machine (10). Most prior work machines with rotatable car or upper structure require large expensive components including gear reduction assemblies, a hydraulic motor, and large diameter swing gear. The subject actuator simplifies the construction by eliminating many of the prior components. |
