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High Wear Resistance And Good Lubrication
May 04, 2018

The camshaft is a component in the piston engine. Its role is to control the opening and closing of the valve. Although in a four-stroke engine, the camshaft rotates at half the speed of the crankshaft (in the two-stroke engine, the camshaft rotates at the same speed as the crankshaft), the speed is usually very high, and it needs to withstand large torques. The camshaft has high requirements in terms of strength and support, and its material is generally high-quality alloy steel or alloy steel. Because the valve movement law relates to the power and running characteristics of an engine, the camshaft design occupies a very important position in the engine design process.

The cam bearing is subjected to periodic impact loads. The contact stress between the cam and the tappet is large and the relative sliding speed is also high, so the wear of the cam working surface is severe. In view of this situation, in addition to the higher dimensional accuracy, smaller surface roughness and sufficient rigidity, the camshaft journal and cam working surface should have high wear resistance and good lubrication.

The camshaft is usually forged from high-quality carbon steel or alloy steel, and may also be cast with alloyed or ductile iron. The journal and cam working surfaces are polished after heat treatment.