Camshaft is a part of piston engine. Its function is to control the opening and closing of the valve. Although the speed of camshaft in four stroke engine is half of that of crankshaft (in two stroke engine, the speed of camshaft is the same as that of Crankshaft), usually its speed is still very high, and it needs to bear a lot of torque. Therefore, the strength and support of camshaft are very high in design, and its material is usually high-quality alloy steel or alloy steel. As the law of valve movement is related to the power and operating characteristics of an engine, camshaft design plays a very important role in the process of engine design.

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