Nockenwellen für den Ventiltrieb von Brennkraftmaschinen

摘要

PCT No. PCT/GB90/01513 Sec. 371 Date Mar. 30, 1992 Sec. 102(e) Date Mar. 30, 1992 PCT Filed Oct. 4, 1990 PCT Pub. No. WO91/05147 PCT Pub. Date Apr. 18, 1991.A camshaft (16) is described for operating the primary and secondary inlet or exhaust valves (12) of an internal combustion engine having multiple valves in each cylinder, the camshaft having cams (18a, 18b) of substantially the same cam profile and phase for operating the primary and secondary valves of each cylinder. In accordance with the invention, in order to reduce valve train noise at least the trailing ramps of the cams (18a, 18b) are offset by between 1 DEG and 3 DEG relative to one another.