| 摘要 |
A rotary actuator includes a plurality of interchangeable and essentially identical modular drive units each having a pair of racks operably rotating a drive shaft such that the torque applied to the shaft is evenly divided between the drive units. The shaft has pinion-type teeth of a length to accommodate the number of drive units needed to develop the required shaft torque. End plates sandwich the drive units therebetween and rotatably support the shafts. An internal channel system routes hydraulic fluid simultaneously to the proper ends of the racks of each of the drive units to translate the racks in unison. A position sensor identifies the rotary position of the shaft and provides such information to the control mechanism. A rack biasing mechanism for each rack provides biasing pressure against an associated back of a rack directly opposite the shaft and includes a roller acting on the back of the rack. A differential pressure sensor arrangement is provided to sense rotary loading of the shaft.
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