| 摘要 |
PURPOSE:To obtain the load supporting performance over a certain value per unit installation area without increasing the close adhesion stress by winding at least two wire materials in concentric and multilayered form in the same winding direction and setting the coil diameter of the wire material so that each wire material is superposed in the axial direction. CONSTITUTION:Coil springs 1 and 2 in double winding form are formed by winding two wire materials having an equal wire diameter in concentric form in the same winding direction into an equal coil diameter, together with an upper flange 3 and a lower flange 4. Therefore, the load supporting performance over a certain value per unit installation area can be obtained without increasing the wire diameter and increasing the close adhesion stress, even if the rigidity ratio between the shaft and the direction perpendicular to the shaft is reduced, and a suitable coil spring for a vibrationproof device can be obtained. |
