| 摘要 |
<p>The system for valve control is an internal combustion engine has a revolving cam and a push rod operated by the cam in an intermittent cycle. It has a resilient re-setting or return mechanism (6, 7) constructed from a first spring (6) which is slack in its rest position, but which becomes compressed as the rotating arm causes pivoting of the rocker arm. The second spring (7) is of higher stiffness and the mass of the element moved by the cam (2) corresponds to the stiffness of the spring in such a way that at a known rate of rotation of the machine it achieves at least part of the opening and closing motion in a ballistic manner.</p> |
