| 摘要 |
<p>Valve operating apparatus is disclosed in which the valves (1a,1b) are operated by rocker arms (7,8,9) driven by cams (3,4,5) having different cam profiles and hydraulically operated coupling mechanisms (21,22) for selectively connecting or disconnecting adjacent rocker arms to vary the operation of the valves under different engine operating conditions. The coupling mechanisms are operated by fluid supplied through the rocker shaft (6) mounting the rocker arms. The rocker shaft is divided into independent fluid supply passages (32,33) whereby the couplings can be supplied independently with operating fluid in order to expand the number of available valve operating control modes. Variations are described in which operating fluid can be independently supplied to various ancillary hydraulically-operated equipment, as well as to the selective coupling mechanisms. <IMAGE></p> |
