| 摘要 |
PURPOSE:To aim at reduction of the generation of hammering and overshooting in an engine by making the difference in level between the planes of action of cams smaller as the quantity of lift of cams becomes larger in the case of a cam, which is provided with a plurality of planes of action, for varying the inclination of a lever touching the rear of a rocker arm. CONSTITUTION:On the rear of a rocker arm 13, whose one end touches a cam 11, and the other end touches the edge of an intake and exhaust valve 12, is provided a lever 15 whose one end is supported by a pivot 19, and the other end is caused to touch a control cam 20, and then, the valve timing and lift of the intake and exhaust valve 12 is controlled by way of varying the position of a supporting point on the rear of the rocker arm 13 by varying the inclination of the lever 15. The cam 20 is provided with a plurality of control faces 20a-20e, and the differences in level between each of these control faces 20a-20e are set to smaller as the quantity of lift becomes larger. Thereby, in an operating range where the quantity of lift becomes larger, the lubricating oil is fed in a larger quantity so that the generation of overshooting in the case of controlling the cam can be prevented.
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