| 摘要 |
In a valve operating system for an internal combustion engine comprising a valve-operation driving force transmission means interposed between a valve operating camshaft and an engine valve carried in a body of the internal combustion engine for opening and closing operation of the engine valve, a valve operation mode changeover mechanism capable of switching the opening and closing mode of the engine valve in accordance with the operating condition of the engine, and a wrapping connector type transmission system provided between the valve operating camshaft and a crankshaft, the valve operating system further includes a tension adjusting means capable of adjusting the tension of a transmitting band of the wrapping connector type transmission system, and a control means for controlling the operation of the tension adjusting means in accordance with the operation mode of the valve operation mode changeover mechanism. It is possible to vary the preset load of the transmitting band in accordance with the operation of the valve operation mode changeover mechanism to vary the peak value of the load applied from the valve operating camshaft to the transmitting band, thereby adjusting the tension of the transmitting band in accordance with the change in operation mode of the engine valve.
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