| 摘要 |
<p>A variable valve drive device, an engine, and a motorcycle. In the variable valve drive device, a cam sprocket (211) is rotated by a drive force transmitted from a crankshaft (130) to rotate an eccentric plate (250) on an axis parallel with the rotating axis of the cam sprocket (211). The eccentric plate (250) is movable from the axis position to the eccentric position of the cam sprocket (211), and rotated at the eccentric position to rotatingly drive an intake cam block (240) through a variable camshaft (230) at the cyclically varying rotating phase difference thereof from the cam sprocket (211). The intake cam block (240) drives an intake valve. The phase angle of the connected portions of the eccentric plate (250) to the cam sprocket (211) and the movable camshaft (230) to the axis of the eccentric plate (250) is 80 to 160° or 200 to 290° when the rotating direction of the eccentric plate (250) is forward.</p> |
