| 摘要 |
PURPOSE:To obtain a lightweight coil spring by making uniform the shear stress generated on a strand in the peripheral direction of a coil. CONSTITUTION:A spring strand 1 is formed by smoothly connecting a circular- arc part (a) having a smaller curvature and a circular-arc part (b) having a larger curvature by curves (c) and (c) and has a circular section. When said strand 1 is extended and contracted, keeping straight the center line X-X of a coil, the spring constant of the circular-arc part (a) having a smaller curvature increases and the stress correction coefficient reduces, and the spring constant of the circular-arc part (b) having a large curvature reduces, and the stress correction coefficient increases. Therefore, the max. shear stress generated on the inner periphery of the coil reduces on the circular-arc part (a) in comparison with the circular-arc part (b). |
