円周スリットナットのねじ山変形とゆるみ防止効果の関係

概要

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In this study, the thread deformation mechanism and relation between thread deformation and anti-loosening effect for nut with circumference slits are studied by the experiment and using FEM. The slit nut is adequately compressed before use. Two methods for compressive pre-strain are compared. It is found that cylinder compression method provides thread with rotational deformation than plate compression method. The rotational deformation has an important role as slowing the increase of the resistance torque with the amount of compression. Therefore, cylinder compression method is superior for processing control. The effects of the slit geometries, which is defined by the location h, the inner diameter d and the width w are investigated based on the experiment and the numerical analysis. It is found that h and d has large effect on thread deformation and w has little effect on that.