| 摘要 |
A fluid actuator with fluid limit valves ( 550, 551 ) and optional adjustable mechanical limits enables the construction of fluid linkages which are able to completely replace mechanical linkages. In a fluid circuit comprising of two or more fluid actuators, the pistons ( 102 ) of the fluid actuators can become uncorrelated when fluid leakage occurs. At the piston ( 102 ) extension and retraction limits, fluid limit valves ( 550, 551 ) open. The open fluid limit valves ( 550, 551 ) allow fluid to bypass pistons ( 102 ) and/or allow fluid from an external source to compensate the fluid leakage. The fluid bypassing pistons ( 102 ) at their extension or retraction limit and/or externally supplied fluid forces the uncorrelated pistons ( 102 ) to reach their extension or retraction limit as well. The fluid actuator with optional adjustable mechanical limits have one or more additional pistons ( 686, 688 ), which have an adjustable separation from the main piston ( 102 ) or end of cylinder. The fluid actuator with fluid limit valves ( 550, 551 ) and optional adjustable mechanical limits enables mechanical linkages to be replaced by fluid circuits composed of the fluid actuators.
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