| 摘要 |
PURPOSE:To obtain a light-weight steering wheel having practically sufficient tortional rigidity by applying in advance a tortional force in the same direction as external force to one-way oriented fibers. CONSTITUTION:A rotary tool 9 is turned to rotate a winding tool 5 in the direction of arrow, and fibers 2 impregnated with a resin are wound around the tool 5 once. Afterwards, the fibers 2 are wound around a boss tool 11 through notches 8. The processes are repeated to laminate a given number of fibers 2 to form a core material 1. After lamination, the tool 9 is removed out, the boss metal tool 11 is turned, and the fibers 2 in the spoke portion 4 are twisted toward one direction which coincides with the direction of distorting the spoke portion 4 by external force, where the left and right sides are in the opposite directions. The core material 1 is heated to harden the resin in such a way as to prevent the restoration of twist, the metal tool 11 is fixed, and the core material 1 is covered with resin and molded at a give temperature and under a given pressure to obtain a product. By adding the twisting' process, the tortional rigidity of the core material can be raised, enabling it to overcome tortional torque to be generated by external forces. |
