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Since the end of 2019, COVID-19 has caused a global pandemic. Countries around the world have begun to block cities and change people’s familiar lifestyles. Many people choose bicycles as a means of transportation or sports, which has increased the demand for bicycles. Since bicycles began to use chains and sprockets in 1874, there has not been much change. The chain will be stretched after a period of use and needs to be replaced. In severe cases, it may fall off or break. In order to improve these shortcomings, this research proposes a scheme that can be directly improved on the propulsion of bicycles. Search domestic and foreign patent websites to find out the bicycle styles that meet the conditions and analyze its structure. Then select four groups of feasible patents for simulation. Finally, decide one to use Taguchi method to improve and install this design on the bicycle. According to Taguchi method, five different analysis targets are proposed. According to the response table, five optimized sizes are obtained. Two sets of sizes are selected for comparison with the original model on comfort and labor saving. They are called New Model_1 and New Model_2.Using RecurDyn to analyze the two models, it is found that under the same force and time, the average crank angular velocity of New Model_2 is 9.337% faster than that of New Model_1, which shows that New Model_2 travels farther in this case; Average crank acceleration of New Model_2 is 46.714% lower than that of New Model_1, which shows that the rider needs less power when riding, which has a labor-saving effect; the pedaling stroke of New Model_2 is 5.599% smaller than that of New Model_1, and the rider has a larger pedaling range It is small and the riding experience is relatively easy. Based on the simulation results, a prototype is made for verification and the analysis results are determined.
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