| 摘要 |
<p>A camshaft drive mechanism includes a drive sprocket (10) mounted for rotation on one end of a camshaft (11), a plurality of double planet gears (13) are mounted in angularly spaced relationship on the drive sprocket (10), said planet gears (13) being freely rotatable relative to the drive sprocket (10), each planet gear (13) having a first set of teeth (15) meshing with a gear (17) mounted for rotation with the camshaft (11) and a second set of teeth (16) meshing with a gear (20) mounted, coaxially of the camshaft (11), for rotation with a secondary input shaft (18), the ratio of the number of teeth on the gear (17) to those on gear (20) being greater than 1, the secondary input shaft (18) being rotatable to vary the drive ratio or phase relationship between the drive sprocket (10) and camshaft (11).</p> |
