| 摘要 |
On a main rocker arm, there is arranged a pivotal sub-rocker arm. A rocker arm coupling mechanism is employed which, under a given condition of an associated engine, couples tightly the main rocker arm and the sub-rocker arm to cause the main rocker arm to pivot in accordance with rotation of a higher lift cam. First and second tappet members are carried by the main rocker arm to actuate two intake or exhaust valves of the engine in response to the pivoting movement of the main rocker arm. The second tappet member is loosely connected to the main rocker arm so that, under a certain condition, the second tappet member fails to transmit the pivoting movement of the main rocker arm to the associated valve. A tappet locking mechanism is further employed which, under a given operation condition of the engine, locks the second tappet member to the main rocker arm thereby to ensure the transmission of the pivoting movement of the main rocker arm to the associated valve.
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