| 摘要 |
PURPOSE:To reduce dispersion in control torque of a cam, by controlling the inclined angle of a lever for supporting the back surface of a rocker arm with the use of the cam driven by a resilient member whose spring constant becomes smaller as the twisting angle thereof becomes greater. CONSTITUTION:A rocker arm 13 is supported by means of a lever 15 whose inclined angle is adjusted by a lift control cam 20, and therefore, the lift amount and timing of an exhaust valve 12 are controlled in due to displacement of the fulcrum. A resilient member (leaf spring) 34 whose spring constant becomes less as the twist angle thereof becomes greater is disposed between the control cam 20 and the control shaft 20. Further, dispersion in operation of the lift control cams 20 among engine cylinders may be made to be minimum while the control torque is reduced. |
