| 摘要 |
A valvetrain 50 for a multiple-cylinder internal combustion engine (10, figure 1) having a camshaft 12 within the engine block (14, figure 1) for operating two valves 28 from a single camshaft lobe 70. A lifter 58 in contact with the common camshaft lobe 70 is associated with a single pushrod 56 which engages a follower 90,94. The follower 90,94 engages at least two rocker arms 54, each of which actuates a different valve 28. The lifter 58 may have a roller (150, figure 3) for contacting the camshaft 12. The follower 90,94 may be a bucket follower with at least two independent lash adjusters, each engaging a rocker arm 54. The lash adjusters may have a high pressure chamber (170,172, figure 3) containing a variable amount of hydraulic fluid. The lash adjustment mechanism and rocker arm 54 may interact via a pivotable surface or a coupling, e.g an elephant foot. The follower 90,94 may reciprocate in a bore within the cylinder head (22, figure 1) or within a fulcrum 126, associated with the rocker arms 54, mounted to the cylinder head (22, figure 1). |
