Patent ID: 6679281
Filing Date: 2004-01-20
Classification: E02F,F15B,Y10T

Abstract:
An actuator for a machine, comprising:supply port; hydraulic circuit with a high pressure part and a low pressure part in fluid communication with said supply port to supply pressure to said high and low pressure parts; a first working port; at least one hydraulic accumulator with a fluid side; a switching valve between said supply port and said first working port at least partially separating said supply port and said first working port in a first operating position thereof to ensure connection of said supply port and said accumulator to charge said accumulator and connecting said supply port and said first working port in a second operating position of said switching valve, said switching valve being initially in said first operating position and having a secondary line connected thereto and connected to operating pressure from said supply port to move said switching valve form said first operating position to said second operating position, said operating pressure in said secondary line corresponding essentially to pressure at said fluid side of said accumulator; a pressure reducing valve between said switching valve and said secondary line and separating said low pressure part from said high pressure part of said hydraulic circuit; and a return valve between said secondary line and said accumulator, and opening in a direction of said accumulator.