EXPERIMENTAL-STUDY OF A VARIABLE-PRESSURE DAMPER ON AN AUTOMOTIVE VALVE TRAIN

A variable pressure damper (VPD) is proposed here to adjusted the fric tion force on the valve spring to investigate the relation between the friction force and the valve train. Valve bounce, component separatio n, spring vibration are observed in the testing. The VPD is shown to h ave significant improvement in reducing valve bouncing distance and su rge vibration under 2985 rpm. Also, experimental results indicate that the component separation becomes more imminent at high speeds with la rger damping forces. Here, in certain speed range, a proper frictional force provided by VPD is shown to be able to eliminate bouncing compl etely without causing component separation.