| 摘要 |
An arm coupling mechanism 72 is provided as changing means for selectively switching double valve variable control and single valve variable control. The single valve variable control is achieved in a condition, in which a large lift arm 70 and a second rocking cam arm 40R are coupled together with a pin 76. The second rocking cam arm 40R for moving a second valve 16R includes a pin hole 80, in which the pin 76 is inserted, formed therein. The position of the pin hole 80 is set so that a pin switching operation can be executed when control is provided to achieve an operating angle, at which the single valve variable control is to be started for reduced NOx. A second driving cam 14 is adapted to have a cam height greater than a cam height of a first driving cam 12. |
