Structure and function of the crankshaft

KS | Kolbenschmidt | Motorservice

How does a crankshaft work? How is a crankshaft constructed? What is torsion resistance? What material are crankshafts made of, and what properties do they need to have? This article gives you the answers.

Function of the crankshaft

The crankshaft converts the force generated by the combustion in the engine into rotary motion. The linear upwards and downwards motion of the pistons is converted into a torque by the connecting rod and then transmitted to the fly wheel.


Construction and properties


To withstand the heavy loads involved, crankshafts have a hardened surface and a tough core. Therefore, crankshafts are often made of forged steel. The continuous grain course enables a high torsion resistance to be achieved. The bearing positions on the crankshaft are surface hardened, making them more resistant to wear. 

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