FEA Of JH125 Motorcycle's Sleeve Roller Chain

Chain, as one of the basic mechanical parts, now is wildly used in many fields of national economy. While used as, for example, driving chain for transferring power, transmission chain for conveying items and raising chain for heaving cargo, chain has presented many useful capabilities. Furthermore, above from the working ability of chain being optimized greatly and the use fields of chain being enlarged, many chain products and frameworks have been developed greatly.At present, the development of the chain product is being in traditional phase in mechanical engineering all over the world, that is to say: first set up a model, then test it to find if there are any problems, and ameliorate it at last. While using the traditional method, there are many difficulties: building model and test should spend much time, the sequent of test disperse, the cost of test is high, and all of the above need much manpower, material resources, machines, and test grounds. With the development of computer at a very fast speed and the progress of the theory of FEA increasingly, using the CAD/CAE software used to build geometrical model, assembling model and FEA model to analyze the chain transmission now become feasible. This new method can shorten the period of development, and save much manpower, material resources, which now is becoming more and more important in the development of chain.This topic comprises of the following parts:① Survey the present development and trend of the chain all over the world, including chain products and chain technologies.② Explain the basic transmission theory, mesh characters, chain types and the main transmission models briefly, analyze the existent problems, and propose some means to improve the chain products' capability and performance.③ The present method applied in calculating the power transmission between the chain products has not consider the effects of the appending dynamical load produced by the accelerating speed of mesh between the chain and sprocket wheel. Author presented a suite of functions to calculate the stress brought by the effects of the appending dynamical load produced by the accelerating speed of mesh between the chain and sprocket wheel. Author has proved theses functions to be necessary and usable through analysis and instance. ④ Calculate the stress of the chain plate, shaft plug and sleeve while being loaded via the functions of stress and displacement theory, get the contact stress value between the shaft plug and sleeve parts from the elastic mechanical theory, and calculate the contact stress value between the sprocket wheel and roller while in meshing process.⑤ Bring forward a real model: JH125 motorcycle. Use CAD/CAE and I-DEAS 8.0 to build a 3-D model according with FEA theory. Analyze the displacement of the chain plates (including outer and inner), shaft plug, and sleeve parts. Analyze the contact strength of the shaft plug and sleeve parts. And analyze the contact strength of the roller and sprocket wheel while in meshing process.⑥ compare the results of the theory with that of FEA analysis.