| 摘要 |
<p>ENGINE VALVE TRAIN SYSTEM An engine valve train system for selectively effecting operation of a pair of side by side valves of a cylinder and to effect deactivation of one of the valves in the pair during predetermined modes of engine operation includes first and second rocker arms pivotably supported on a hollow rocker shaft which in turn is suitably supported for pivotable movement between an operative position and an idle or inoperative position and which is connected to a source of pressurized hydraulic fluid. The first rocker arm is adapted to be driven by an actuator to effect opening and closing movement of one of the valves. The second rocker arm has a hydraulic cylinder and piston means which, when the rocker shaft is in the operative position, is supplied with hydraulic fluid whereby to extend the piston to operatively connect the second rocker arm with the first rocker arm so as to be also operated thereby whereby to effect opening and closing movement of the other one of the valves and when the rocker shaft is in the idle or inoperative position, hydraulic fluid can drain from the hydraulic cylinder and piston means whereby the second rocker arm becomes inoperative to effect opening movement of the other one of the valves.</p> |
