What is the function of the crankshaft?

[StPeyton]

The function of the crankshaft: It is an important component in the engine that receives the force transmitted by the connecting rod and converts it into torque, which is then output through the crankshaft to drive other accessories on the engine. The crankshaft is subjected to the combined effects of centrifugal force from rotating masses, periodically varying gas inertial forces, and reciprocating inertial forces, causing it to bear bending and torsional loads. Therefore, the crankshaft must have sufficient strength and stiffness, with wear-resistant journal surfaces, uniform operation, and good balance. To reduce the mass of the crankshaft and the centrifugal force generated during operation, the crankshaft journals are often made hollow. Oil holes are drilled on each journal surface to allow oil to be introduced or discharged for lubricating the journal surfaces. To reduce stress concentration, transition arcs are used to connect the main journals, crankpins, and crank arms.