Patent ID: 8776749

Claim:
A desmodromic hydraulic valve train for reciprocating piston engines and pumps comprising at least: a valve ( 1 ) comprising a valve piston ( 2 ) and a valve stem ( 3 ), the valve piston ( 2 ) is secured to the valve stem ( 3 ); an opening oil chamber ( 4 ), one end of the valve piston ( 2 ) is slidably fitted and seals one side of the opening oil chamber ( 4 ); a closing oil chamber ( 5 ), another end of the valve piston ( 2 ) is slidably fitted and seals one side of the closing oil chamber ( 5 ); a cam ( 6 ); an oil piston ( 7 ); an oil chamber ( 8 ), the oil piston ( 7 ) is slidably fitted and seals one side of the oil chamber ( 8 ), the cam ( 6 ) moves in synchronization to the engine or pump and forces the oil piston ( 7 ) to perform an actuating motion wherein the oil piston displaces oil out of the oil chamber ( 8 ); an oil reservoir ( 11 ), the cam ( 6 ) controls an oil piston ( 7 ) restoring motion wherein oil from the oil reservoir ( 11 ) enters into the oil chamber ( 8 ); control means ( 71 ), ( 10 ), and channels ( 9 ) connecting controllably the opening oil chamber ( 4 ) and the closing oil chamber ( 5 ) with the oil chamber ( 8 ) and the oil reservoir ( 11 ), the actuating motion of the oil piston comprises an initial part wherein the oil from the oil chamber is directed, according to a state of the control means, either to the opening oil chamber and displaces the valve to open positively, or to the closing oil chamber and displaces the valve to close positively, the actuating motion of the oil piston comprises a final part wherein the oil from the oil chamber is directed to the closing oil chamber and displaces the valve to close positively, the final part of the actuating motion is adequately long to guarantee that at the end of the actuating motion of the oil piston the valve will be closed.