Patent ID: 8714125
Filing Date: 2014-05-06
Classification: F01L,Y10T

Abstract:
1. A valve drive system of an engine, the valve drive system comprising: a camshaft that is supported by a cylinder head of the engine and on which a plurality of cams having different valve lift characteristics are arranged at predetermined intervals; a rocker shaft supported by the cylinder head in parallel or substantially in parallel with the camshaft; a rocker arm that is disposed between one of the plurality of cams and an intake valve or an exhaust valve, that is swingably supported by the rocker shaft, and that is movable in an axial direction of the rocker shaft, the rocker arm including a presser for the intake valve or the exhaust valve and extending in the axial direction for a length greater than the predetermined interval between the plurality of cams; and a drive unit that moves the rocker arm toward one side or toward an opposite side in the axial direction by the predetermined interval between the plurality of cams; wherein the drive unit includes: