What is a Motorcycle Crankshaft?

[VonKendra]

A motorcycle crankshaft converts reciprocating motion into rotational motion and outputs power through the gear at one end of the crankshaft. The role of the crankshaft: It is the most important component in the engine. It receives the force transmitted by the connecting rod and converts it into torque, which is then output through the crankshaft to drive other engine accessories. The crankshaft is subjected to the combined effects of centrifugal force from rotating masses, periodically varying gas inertial forces, and reciprocating inertial forces, resulting in bending and torsional loads. Therefore, the crankshaft must have sufficient strength and stiffness, with wear-resistant journal surfaces, uniform operation, and good balance. The structure of the crankshaft: To reduce the mass of the crankshaft and the centrifugal force generated during operation, the crankshaft journals are often hollow. Oil holes are drilled on each journal surface to allow oil to be introduced or discharged for lubricating the journal surfaces. To minimize stress concentration, the connections between the main journals, crankpins, and crank arms are designed with transition arcs.