Patent ID: 7584730

Claim:
A valve train device for an engine for driving a valve which opens and closes a valve opening of a combustion chamber, comprising: a valve drive device comprising a drive member; a drive force transmission mechanism configured to transmit a driving force from the drive member to the valve, the drive force transmission mechanism comprising a transmission portion configured to transmit the driving force from the drive member to the valve and a variable portion configured to continuously change a state of the transmission portion to thereby continuously change an opening duration of the valve or the amount of valve lift, wherein at least part of the variable portion is positioned within in the transmission portion; wherein the state of the transmission portion is changed by changing the position of the variable portion with respect to the transmission portion; and wherein the transmission portion includes an arm comprising a pair of bearing portions that are pivotally supported on a support shaft; wherein the variable portion comprises a control arm that is pivotally supported on an eccentric shaft which is formed on the support shaft between the pair of bearing portions.