| 摘要 |
In an internal combustion engine having a conventional continuously variable valve lift mechanism, a pumping loss is not reduced even if a throttle valve is replaced and the engine separately requires a variable valve timing mechanism for changing the phase of a camshaft to produce an idling state. In a system of the invention for varying the total valve opening angle, a fitting part for stopping gas flow even if a valve is slightly lifted is provided at the opening of a port of a valve having a continuous variable valve lift mechanism. The system can also be used for displacement type pressure engines. A pumping loss is reduced by synergistic effects such as overlap of the valve being eliminated, the amount of a variation in valve timing being increased, and the valve being quickly closed due to existence of the fitting part. Since the continuous variable valve lift mechanism-cum-variable timing mechanism of a subordinate concept can controllably keep valve opening timing at the top dead center by a single control rod, the throttle valve can be easily replaced. |
