| 摘要 |
<p>PURPOSE:To secure optimum conditions in a valve characteristic, by installing three suction-exhaust valve driving cams connectedly on a camshaft as well as installing a rocker arm driving part in a manner conformable to each cam, while connecting an interval between adjacent rocker arms according to an engine driving state, and selecting an actuating cam. CONSTITUTION:Two suction valves 1a and 1b are opened or closed by rocker arms 7, 8 and 9 being operated by three cams 3, 5 and 4 connectedly installed on the camshaft 2 set up in the upper part. Connecting pistons 22 and 23 are installed in the central rocker arm 7 and an adjacent part of these rocker arms 8 and 9 at both sides, and when pressure oil is fed to a chamber 29, these pistons 22 and 23 are moved as in illustration against a spring 37, whereby all rocker arms 7, 8 and 9 become unitized as one body and rotated. When the pressure oil inside the chamber 29 is drained, both contact surfaces between pistons 22 and 23 as well as between the piston 23 and a pressing piece 24 accord with both end faces between rocker arms 7 and 9 as well as between the rocker arms 9 and 8, coming into a free rotational state, thus these rocker arms 7 and 8 operate in an independent manner.</p> |
