摘要 |
<p>A device having a first (16) and second (20) rocker arm, and a control linkage. The first rocker arm (16) has a first end receiving a first roller (18) and a second end riding on a camshaft lobe. A second roller (14) travels along an upper surface (21) of the first rocker arm (16). The upper surface (21) of the second rocker arm (20) receives the first roller (18). When the control linkage (12) is in a first position, the first rocker arm (16) and roller (18) slides along the upper surface (21) of the second rocker arm (20) towards the first end of the rocker arm, such that the valve head has maximum duration and lift from the valve seat. When the control linkage (12) is in a second position, the first roller (18) slides along the upper surface of the second rocker arm (20) towards the second end of the rocker arm such that the valve head has minimum duration and lift from the valve seat.</p> |