| 摘要 |
<p>PURPOSE:To make the amount of change in the valve opening timing different from that in the closing timing by furnishing a cam lift absorption mechanism in the transmission mechanism, and by giving the cam a rising profile asymmetrically to its sinking profile. CONSTITUTION:In this driving cam 1 used in a variable valve lift timing mechanism, the rising profile P1 is given a different form from the sinking profile P2. The amount of change in the valve opening timing of a suction/exhaust valve with respect to the change in the amount of cam lift absorption by the transmission mechanism is thus different from the amount of change in the valve closing timing, so that optimum valve overlapping as well as optimum exhaust valve opening timing and suction valve closing timing are obtained at each revolving speed of engine so as to ensure an enhanced torque characteristic, for ex., for full open condition.</p> |
