| 摘要 |
PURPOSE:To improve load-resisting performance by disposing a unidirectional carbon fiber/epoxy resin prepreg layer having a large shearing strength at least near the outer surface. CONSTITUTION:A unidirectional carbon fiber/epoxy resin prepreg layer having a large shearing strength of more than 10kg/mm.<2> is arranged and laminated + or -35- + or -55 deg. in order to increase torsion resistance, and is wound round a suitable core material such as a metal wire, plastic wire or the like. At this time, the prepreg is wound into a cylinder in such a manner that the prepreg winding end is not positioned inside the coil. The thus wound prepreg is heated and hardened to obtain a coiled spring. |
