ENGINE WITH VARIABLE VALVE ACTUATING MECHANISM

摘要

An internal combustion engine is described having a valve mechanism that comprises an SCP camshaft (10) operating two sets of valves (16, 22). The first set of valves (22) is operated via a summation rocker system (38, 40) such that the valve lift characteristic results from the combination of two cam profiles (18, 20). The second set of valves (16) has a valve lift characteristic that is different from that of the first set. In the invention, changing the valve lift characteristic of the first set of valves by varying the phase of the inner shaft (10b) of the SCP camshaft relative to the outer tube (10a) of the SCP camshaft serves additionally to alter the operation of the second set of valves.