The paper analyses the bending fatigue strength of a crankshaft single crank from the view point of reliability design by means of 3d finite element method.

Based on analyzing the unbalanced force of crank-connecting rod mechanism, this paper describes the balance of motorcycle single-cylinder engine according to practices home and abroad.

A single-cylinder high-speed diesel engine with dual symmetric crank-conrod mechanism was developed and tested on a dynamometer test bed.