| 摘要 |
Coupling for driving two cam sets from a crankshaft comprises a driving member hydraulically coupled to two driven members each connected to a respective cam set. The position of each driven member is variable relative to the drive member independently of the other. The driving member may be toothed ring 132 having inward vanes 134; first driven member a hub 138 having radially outward vanes 140 connected to a camshaft (14 Fig. 4) and first cams (18), and; second driven member 142 a disc having projections 144 and connected to a tube (12) rotatable relative to the camshaft and carrying second cams (16). The members define cavities divided into chambers by vanes and projections and rotational positions of the members are adjusted by selective pressurising/venting of chambers. Alternatively there may be separate cavities for each driven member (Figs 3). |
