| 摘要 |
PURPOSE:To reduce the weight of a spring and to manufacture even a large spring at a low cost by using fiber reinforced resin as spring raw material, and arranging the direction of fibers of a spring element wire at an angle within a specified range with respect to the axis of the spring element wire. CONSTITUTION:Fiber reinforced resin is used as spring raw material, and the direction of fibers of the spring element wire is at an orientation angle + or -alpha deg.with respect to the axis of the spring element wire. The orientation angle + or -alpha deg.is determined depending on the ratio of bending and torsion, that is, spring load. It is good that alpha is 20 deg.-45 deg.. On the other hand, a flexible core 4 is filler material for keeping the cylindrical section of the element wire, and light-weight body is used as the core. As fiber reinforced resin is used as raw material of a helical spring 13, the highness of resiliency of raw material can be utilized and an orientation angle of reinforcing fiber can be obtained in order that raw material elastic property is optimum, so that the weight can be reduced. Helical springs of various properties can be obtained by varying the amount of reinforced fibers, drawing forming die and a mandrel, so that even a large spring can be manufactured at a low cost. |
