1. The camshaft is an integral part of the valve train in the engine. Tappets and push rods press the cams on the camshaft against the valve stem by means of rocker arms. The valves are opened against the spring force from the valve springs depending on the cam position. The camshaft obtains its drive from the crankshaft via gears, roller chains, toothed belts or vertical shafts. Camshafts on diesel engines in heavy commercial vehicles are generally driven by gears. In addition to tappet and push rod control, rocker arm or drag lever controls are also frequently used in diesel engines.

2. Heavy duty truck, buses, engineering machinery, mining machinery, petroleum machinery, railway machinery, port machinery, stationary and mobile diesel generator set power stations, Marine propulsion unit and auxiliary power unit, pump power units and other power units, automobile industry power ships.