Kinematic And Dynamic Analysis On Valve Train Of Motorcycle Engine

Valve train is one of the important components of a complete engine. The efficiency of charge and exchange are influenced by the design of valve train, accordingly, the power, economics of fuel and harmful emission are affected as well. The liability and noise of engines are impacted by the liability and noise of valve train directly. The research and the development of valve train are becoming urgently due to the increasingly enhanced requirements to engine's power and emission.The investigation object in this article bases on CG125 motorcycle , further research and analysis job were performed on profiles of cams and design theory of kinematics and dynamics, the valve train of CG125 engine is the prototype for optimizing, the other systems involved were optimized at the same time, the testing results showed more than 10% torque could be reinforced and above 10% fuel could be saved during low- medium speed phases comparing to the prototype engines, the Euro II emission standard could be satisfied easily without any accessory, the other promotion are favourable applicability to rough road, outstanding driving power, prominent economics and friendly to environment.First, the quality of charge, the efficiency of exchange, outer characteristic and specific fuel consumption could be ameliorated by optimal timing diagram which were established by the results of testing and analysis based on research and development of kinematics of valve train and design theory of the profile of cams.Second, the actual motion and force could be acquired by calculation and analysis via movement differential equations based on the model of valve train dynamics which was set up form CG125 engine. After comparing the single-quality model with the double-quality model, the influence factors to valve train could show up, and then combining with the software to set up the valve train model in order to analyze the rationality of valve train of CG125 engine. The analysis data could be adopted for optimizing the design of valve train and max. Time-area value, the cams profiles, the alteration design of inferior rocker arm. This production had applied to nation practicability award. The manufacture of prototype parts had been implemented after the new-design settled. The results of monomial testing to parts and performance testing to engines identified the advance of engine performance during low-medium speed and the reducing of motorcycle's specific fuel consumption. Using this new type engine for motorcycle could satisfy Euro II emission standard without any stuff.