The camshaft is a component in a piston engine. Its function is to control the opening and closing actions of the valve. Although the speed of the camshaft in a four stroke engine is half that of the crankshaft (in a two-stroke engine, the speed of the camshaft is the same as the crankshaft), its speed is usually still very high and it needs to withstand a large amount of torque. Therefore, high requirements are placed on the strength and support of the camshaft in design. The material is usually special cast iron, and occasionally forgings are used. Due to the fact that the valve motion law is related to the power and operating characteristics of an engine, camshaft design plays a very important role in the design process of the engine
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