| 摘要 |
<p>PURPOSE:To perform smooth revolution of an engine at partially loaded operation, in which operation of cylinders is partially stopped, by stopping operation of an intake valve in an idle cylinder and opening an exhaust valve from an exhaust stroke to an intake stroke. CONSTITUTION:If the end part of a rocker arm 8 is contacted to a basic circle part 7c of a cam 7a, repulsive force of a valve spring 16 for the arm 8 is decreased, and an actuator 13 is operated to move the arm 8 through a shaft 14 and rocker bracket 15 in the direction P while compressing a spring 11, then an end part of the arm 8 is contacted to the periphery of a cam 7b. On the other hand, when the cam 7b comes to the circle 7c by action of the spring 11, the arm 8 is moved in the direction Q. In this way, an intake valve is closed and an exhaust valve is opened to resuck exhaust to a combustion chamber in an intake stroke while the intake and exhaust valves are closed to compress burnt gas in a compression stroke.</p> |
