Importance

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Abstract

A hydraulic actuator, comprising: a housing; a rod secured to a piston, the rod and piston being slidably received within the housing, wherein the rod along with the piston is capable of movement between a first position and a second position; a first chamber positioned on one side of the piston and within the housing; a second chamber positioned on another side of the piston and within the housing; a self contained flexible volume compensator disposed within the housing; a fluid disposed in the first chamber, the second chamber and the self contained flexible volume compensator, wherein the fluid in the self contained flexible volume compensator is pressurized to a predetermined pressure level; a bidirectional pump for moving the fluid between the first chamber, the second chamber and the self contained flexible volume compensator; a valve system disposed in the housing and for providing selective fluid communication between the first chamber, the second chamber and the self contained flexible volume compensator as the rod moves in a range of movement defined by the first position and the second position, wherein the valve system isolates the first chamber from the self contained flexible volume compensator and the second chamber when a fluid pressure in at least one of the first chamber, the second chamber and the self contained flexible volume compensator is below a predetermined level; and wherein the pressurized fluid in the self contained flexible volume compensator is transferred from the self contained flexible volume compensator to the second chamber via the pump and fluid in the first chamber is transferred to pump from the first chamber when the rod is moved toward the second position and wherein fluid in the second chamber is transferred from second chamber to the self contained flexible volume compensator and the first chamber when the rod and piston are moved towards the first position.

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First Claim