| 摘要 |
<p>A variable valve gear has a drive shaft (1) rotating in synchronism with a crankshaft of an engine, a drive cam (13) provided on the drive shaft (1), a rocking cam (6) rockably supported by the drive shaft (1), an engine valve opened and closed by rocking of the rocking cam (6), a rocking shaft (7) parallel to the drive shaft (1), a rocker arm (3) rockably supported by the rocking shaft (7), a first link (4) for linking the rocker arm (3) and the drive cam (13), a second link (5) for linking the rocker arm (3) and the rocking cam (6), and rocking-shaft position change means for changing the angle of operation and the amount of lift of the engine valve by changing the position of the rocking shaft (7) relative to the drive shaft (1). In a predetermined range of the angle of operation of the engine valve, the position of the rocking shaft (7) relative to the drive shaft (1) changes such that a change in the maximum lift of the engine valve caused by a change in the angle of engine valve operation is less than that when the angle of engine valve operation is changed outside the predetermined operation angle range.</p> |
