| 摘要 |
A hydraulic actuator is formed by an assembly including a first element, a cylinder, a body section and a chamber. The first element is provided with a first set of a plurality of different sized piston cavities and piston elements which cooperate with a second set of piston elements and piston cavities respectively formed on a second element. The second element forms a piston in cylinder. The body sides incorporates, preferably in symmetrical relationship around the axis, of the assembly a plurality of valves, one valve for each of the pairs of cooperating pistons and cavities. A piston divides the chamber into a high pressure reservoir and a low pressure reservoir with the piston being urged toward the high pressure reservoir to maintain a difference in pressure between the high and low pressure reservoirs. Passages connect each of the valves to the high and low pressure reservoir and each valve with respective of the cavity adapted to selectively connect its respective cavity to either the high pressure reservoir or the low pressure reservoir.
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