Patent ID: 6837198
Filing Date: 2005-01-04
Classification: F01L,Y10T

Abstract:
1. A variable valve train ( 1 ) for load control of a spark-ignited internal combustion engine, preferably a fully variable valve train ( 1 ) for throttle-free load control of the internal combustion engine, said valve train ( 1 ) being arranged between cams ( 2 ) of a camshaft ( 3 ) and inlet valves ( 9 ) of cylinders of the internal combustion engine and comprising direct valve actuating elements ( 15 ), transmission elements ( 5 ) and adjusting elements ( 8 , 8 a ) for influencing the lifting function of the transmission elements ( 5 ) that are drivingly installed between the cams ( 2 ) and the valve actuating elements ( 15 ) and have first working surfaces ( 4 ) loaded by the cams ( 2 ) and second working surfaces ( 13 ) acting on the valve actuating elements ( 15 ), characterized in that each cylinder possesses at least two inlet valves ( 9 ), and at least one particular part of the transmission element ( 5 ) comprising the second working surface ( 13 ) and one particular adjusting element ( 8 , 8 a ) are associated to each inlet valve ( 9 ), said particular adjusting element ( 8 , 8 a ) being displaceable relative to a further adjusting element ( 8 , 8 a ) of a second inlet valve ( 9 ) or to further adjusting elements of further inlet valves of each cylinder, the adjusting elements ( 8 ) are pivoting fingers or eccentrics and are mounted on a hollow shaft ( 6 ) that extends in direction of the inlet valves ( 9 ), the adjusting elements ( 8 ) of a first row of identical inlet valves ( 9 ) of all cylinders are fixed to the hollow shaft ( 6 ) by a rigid connection, and when two inlet valves ( 9 ) are provided for each cylinder, the adjusting elements ( 8 a ) of a further row of adjacent identical inlet valves ( 9 ) of all cylinders are rotatably mounted relative to the hollow shaft ( 6 ), a further shaft ( 7 ) is arranged in a bore ( 17 ) of the hollow shaft ( 6 ) for relative rotation thereto, which further shaft ( 7 ) comprises an entraining element ( 19 ) for each adjusting element ( 8 a ) of the further row of identical inner valves ( 9 ), and said entraining element ( 19 ) projects through the hollow shaft ( 6 ) and is connected to the associated adjusting elements ( 8 a ).