| 摘要 |
<p>A valve timing control system of an internal combustion engine having a camshaft (1) for operating intake or exhaust valves. The valve timing control system is comprised of a cylindrical sprocket (2) driven through a timing chain by a crankshaft of the engine. An arm (11) is fixed to one end of the camshaft and located inside the sprocket in a manner to extend generally diametrically. An annular piston (18) is movably disposed coaxially with the camshaft and inside the sprocket to define an oil pressure chamber (30). The piston is moved axially by controlling the oil pressure to be supplied to the oil pressure chamber, in accordance with an engine operating condition. At least three sliders are supported to the piston to move with the piston. Each slider (19,20,21,22) has an inclined face which is in slidable contact with a side face of the arm. This inclined surface is adapted to push the arm to rotate around the axis of the camshaft when each slider is moved axially upon the axial movement of the piston. The rotation of the arm causes the camshaft to make its relative rotational movement to the driven sprocket, thereby changing the opening and closing timings of the intake or/and exhaust valves. <IMAGE></p> |
