Dynamic Balance Two-Dimensional Measuring of Crankshaft Assembly in Motorcycle Engine

A crankshaft assembly has different structure and dynamic characteristics than a normal revolved body, which leads to problems in dynamic balance measurement and imbalance compensation of it. The traditional method used to measure crankshaft assemblies is too inefficient to meet the modern manufacturing industry's requirements. Inspired by the challenges, methods for dynamic balance measurement and imbalance compensation of it are proposed in this paper. First, three typical dynamic balance models of a crankshaft assembly are built for different unbalanced mass distributions. Then, the unbalanced inertial force and unbalanced characteristic parameters are formulated and analyzed. Based on dynamic balance modeling and synthesis, an imbalance compensation method is proposed by drilling-out at a specific angle of the crankshaft. Finally, the dynamic balance measurement experiment is conducted, and the results validate that the proposed method is fast and accurate.