Patent ID: 7882812

Claim:
A valvetrain mechanism of an engine, comprising: a drive shaft configured to rotate in synchronization with the engine; a link arm having a large end and a small end, the drive shaft being inserted into and passed through the large end; a valve lift control shaft disposed parallel to the drive shaft and having an eccentric portion; an oscillating arm disposed rotatably at the eccentric portion of the valve lift control shaft and interconnected with the small end of the link arm via a first rotation support point; a link rod interconnected with the oscillating arm via a second rotation support point positioned at a same side as the first rotation support point with respect to the valve lift control shaft; and an oscillating cam interconnected with the link rod via a third rotation support point and operated correspondingly with an operation of the drive shaft to thereby open an valve; wherein a thickness of the small end of the link arm in a direction of the drive shaft is thinner than a thickness of the large end of the link arm in the direction of the drive shaft.