| 摘要 |
PURPOSE: To provide an assembled shaft having large torsional strength and flexural strength as well as light by extending a shoulder region downward to a driving element and fixing it between a pipe member and the driving element materially in a shape connecting state. CONSTITUTION: Shoulder regions 9, 10 outside diameters to respectively guide onto a pipe member 1 of which are reduced are provided among driving elements 2, 3, 14, sleeves 7, 8 larger in diameter than the pipe member 1 are inserted, the shoulder regions 9, 10 extend downward below the driving elements 2, 3, 14 and they are fixed between themselves and the pipe member 1 in an intrinsically shape connecting state. Consequently, a pipe member on the outside consisting of each of the sleeves 7, 8 can be enlarged in diameter as long as a build-in condition of a shaft permits, torsional strength increases with fourth power of diameter, and accordingly, it is possible to provide large strength even when the sleeves 7, 8 are thin. Consequently, it is possible to provide an assembled shaft having large torsional strength and flexural strength without a defect of weight. |
