| 摘要 |
<p>PURPOSE:To provide a means capable of supplying working oil to a valve timing control device of a hydraulic drive type at proper hydraulic pressure and in a proper supply amount regardless of engine speed. CONSTITUTION:On a camshaft 3, a cam 13 for pump driving with a tapered cam face extending forward is provided. To move the camshaft 3 in the longitudinal direction, a valve timing control device 7 driven by working oil supplied from an oil pump 15 is provided. Hereby, at the time of high rotation, the camshaft 3 is arranged at a front position by the valve timing control device 7, and at this time, the oil pump 15 is driven at a rear part of the cam for pump driving, that is, at a part where cam diameter is small, and accordingly, excessive rise of a discharge amount and discharge pressure is prevented. Conversely, at the time of low rotation, the camshaft 3 is arranged at a rear position, the oil pump 15 is driven at a front part of the cam 13 for pump driving, and a sufficient discharge amount and discharge pressure are secured.</p> |
