対向分布圧縮荷重を受ける弾性中空円筒のエネルギ貯蔵特性および剛性に及ぼす内半径の効果

抄録

A bicycle crank gear with hollow cylindrical elastic bodies has been developed to increase efficiency driving bicycles. Hollow cylindrical elastic bodies built in a crank gear are compressed by pedaling, and elastic strain energy stored in the bodies leads to improve accelerating performance of bicycle and to reduce muscle strain of human during pedaling. However, mechanism in the elastic bodies inside the gear has not yet been clarified, and its theoretical clarification is required. Assuming that a hollow cylindrical elastic body built in a bicycle crank gear is subjected to oppositely distributed pressures on the outer boundary, we have theoretically analyzed the elastic behavior of the cylinder. Considering deformation of the hollow circular cylinder in a bicycle crank gear compressed by pedaling does not recover perfectly, numerical calculations have been carried out and an effect of inner radius on changes of elastic strain energy, shrinkage and rigidity in the cylinder has been evaluated quantitatively.