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陳信志 (Shing-Zi Chen)
陳信志 (Shing-Zi Chen)
DEVELOPMENT OF A VARIABLE STIFFNESS MECHANISM IN THE REAR DERAILLEUR
DEVELOPMENT OF A VARIABLE STIFFNESS MECHANISM IN THE REAR DERAILLEUR
彈簧彈性係數可變機構之設計在自行車後變速器之應用
彈簧彈性係數可變機構之設計在自行車後變速器之應用
The rear derailleur is one of the key components in the derailed system of the multi-speed bicycle. In the past researches, it was found that the values of the B-spring stiffness and P-spring stiffness affect the tension of the chain and the positions of the guide pulley directly.
The rear derailleur is one of the key components in the derailed system of the multi-speed bicycle. In the past researches, it was found that the values of the B-spring stiffness and P-spring stiffness affect the tension of the chain and the positions of the guide pulley directly.
According to the influence of the B-spring and P-spring stiffness, different P-springs are set to experiment and compare with the simulated results. The smaller P-spring stiffness can keep the distance between the guide pulley and the bigger freewheel with the distance between the guide pulley and the smaller freewheel in the bigger P-spring stiffness equally. The tight-side tension forces of the chain in each speed-rate are also measured in the constant rotation velocity by the designed equipment. The experimental results of the tight-side tension are different from the simulated results. However, these differences can be explained by different environment setting.
According to the influence of the B-spring and P-spring stiffness, different P-springs are set to experiment and compare with the simulated results. The smaller P-spring stiffness can keep the distance between the guide pulley and the bigger freewheel with the distance between the guide pulley and the smaller freewheel in the bigger P-spring stiffness equally. The tight-side tension forces of the chain in each speed-rate are also measured in the constant rotation velocity by the designed equipment. The experimental results of the tight-side tension are different from the simulated results. However, these differences can be explained by different environment setting.
Three variable stiffness mechanisms are proposed. The characters of them make the mechanism stiffness with lowering variable when the torsion angle is larger. The advantage and the disadvantage are compared from manufacture and analysis to decide a better design. And then aim to such mechanism, the prototype of this spring mechanism will be manufactured to test, analyze, and discuss. The spring mechanisms are not only applied in the planar rear derailleur, but also applied in any mechanical engineering design that want to make the spring stiffness with lowering variable.
Three variable stiffness mechanisms are proposed. The characters of them make the mechanism stiffness with lowering variable when the torsion angle is larger. The advantage and the disadvantage are compared from manufacture and analysis to decide a better design. And then aim to such mechanism, the prototype of this spring mechanism will be manufactured to test, analyze, and discuss. The spring mechanisms are not only applied in the planar rear derailleur, but also applied in any mechanical engineering design that want to make the spring stiffness with lowering variable.
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