抄録
In this paper, the strength of wheel disc of a newly devised wheel in order to lighten rolling stock was discussed basing on an approximate bending theory for a flat spherical shell, since this wheel disc consists of two discs having the form of a flat spherical shell which are made up to a wheel together with boss and rim by welding. In this theory, unbalanced traction is supported only by the stresses deduced from the membrane theory and the boundary condition is satisfied by the sum of solutions of membrane and bending theories. Some approximations were utilized in order to derive the solution of bending theory. The stresses due to the force-fit of axle and the shrinkage fit of tyre and also those due to axle load and side thrust were considered. As the latter is non-symmetric problem, it was assumed for simplicity that the boss and rim are rigid. This assumption will entail larger error than those due to approximations made in bending theory.
