Patent ID: 9599131
Date: 2017-03-21
CPC Classifications: B21B,B23Q,F15B,F16F,F16L

Claim:
1. A vibration damping system by means of a hydraulic actuation system, comprising: at least one hydraulic actuator having a movable part, and a corresponding hydraulic feeding circuit which supplies said hydraulic actuator, and hydraulic damping means for a vibrating force acting on the movable part of the hydraulic actuator; said damping means being connected to said hydraulic circuit to actuate a damping of said vibrating force, and characterized in that said damping means comprise a double chamber cylinder having a first chamber hydraulically connected to said hydraulic circuit, and a movable part connected to an electric damping part, and in that the first chamber is hydraulically connected to and communicating with a second chamber of the double chamber cylinder by means of a calibrated pipe or passage having a length and a diameter defining a critical frequency of the calibrated pipe, wherein according to the length and diameter of the calibrated pipe, a pressure wave propagation towards the second chamber is allowed to pass through the calibrated pipe allowing equalization of pressure in the first and second chambers in relation to frequencies lower than the critical frequency of the calibrated pipe and inhibited to pass through the calibrated pipe preventing equalization of pressure in the first and second chambers in relation to frequencies higher than the critical frequency of the calibrated pipe, thereby actuating the hydraulic damping means to dampen the pressure wave propagation.