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.