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