Patent ID: 6938413
Filing Date: 2005-09-06
Classification: E02F,F15B

Abstract:
1. A hydraulic control arrangement for damping driving vibrations of a mobile machine, comprising a hydraulic cylinder ( 2 ) supporting a working tool the cylinder chambers ( 12 , 14 ) of which are connectable to a fluid source ( 6 , 10 ) or a tank (T) via a control valve arrangement ( 4 ), and comprising a damping valve arrangement ( 8 ) for connecting a cylinder chamber ( 12 ) to a hydraulic accumulator ( 10 ) and another cylinder chamber ( 14 ) to the tank (T), wherein the damping valve arrangement includes a valve ( 24 ) for influencing the pressure in the hydraulic accumulator ( 10 ) and a check valve ( 30 ) for preventing a backflow of the fluid from the hydraulic accumulator ( 10 ) to the cylinder chamber ( 12 ), characterized in that the valve ( 24 ) has a pressure control function through which a connection between the hydraulic accumulator ( 10 ) and the tank (T) can be controlled to be opened when a limit pressure is exceeded, and in that the check valve ( 30 ) is disposed in a passage ( 74 , 82 ) of the valve ( 24 ) through which the terminal (U) connected to a cylinder chamber is connectable to an accumulator terminal (P′) connected to the hydraulic accumulator ( 10 ), wherein the passage ( 74 , 82 ) can be controlled to be closed when driving the valve ( 24 ) in the direction of the pressure control function.