| Crankshaft is a special rotor which mainly be used in engines. Crankshaft is not a separate operation in the course of practical work, but be integral with the connecting rod and piston. So it will be inconsistent with the actual working conditions if we only do balancing test on crankshaft. This article is the research for the above issue. On the foundation of the dynamic balancing theory of crank connecting machine, studying the traditional motorcycle dynamic balancing testing system. There are many shortcomings of traditional test systems, such as complicated steps, low testing accuracy, low efficiency and higher test costs.This paper introduces a new dynamic balance test method of crank assembly. Crankshaft, connecting rod and piston are considered as a whole in the process of testing. The new system has such many distinct advantages as data acquisition and processing base on PC-control, high accuracy and efficiency, easy to operate, do not need to rotate sensor or piston, timely graphics. By testing the dynamic balance of motorcycle crank-connect rod mechanism show that the new dynamic balance test system can get the desired results compared with the similar equipment imported from abroad . But the test of accuracy and stability is necessary to be improved.The article does some study focusing on the improved design of the new test system . Firstly, starting from the equilibrium theory, dividing the connecting rod of the dynamic model into three conditions, deriving calculation theory of unbalanced curve derived unbalanced through a special method to general . Secondly, introducing the improved design of the new test system, comparing advantages and disadvantages of the two plans before and after improvement. Thirdly, analyzing the influences of cantilever structure and coupling on test accuracy. Then proposing a semi-automatic balance system . Finally, analyzing error sources of the balancing system and putting forward some solutions.
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