Effect of Nut Height on Prevailing Torque in Screwing Process of Pitch Difference Nut

著者の以前の研究は、ピッチ差のあるボルトナット締結体が疲労強度と緩み止め性能を向上させることを明らかにした。 しかし、疲労強度向上に最適なピッチ差と緩み止め性能向上に最適なピッチ差は異なる。そこで本論文では、ナット高さを高くすることで、両者の向上を同一のピッチ差範囲で実現させることを目的とする。The authors’ previous studies revealed that the bolt nut connections having pitch difference may realize fatigue life improvement and anti-loosening performance. However, the suitable pitch difference for improving the fatigue life is relatively smaller than the suitable pitch difference for improving anti-loosening performance. In other words, there is no pitch difference improving both fatigue life and anti-loosening performance. Therefore, in this paper, the effect of nut height on the anti-loosening performance is newly considered. The results show that the most suitable pitch difference for anti-loosening performance can be reduced by increasing the nut height. This nut height may realize both anti-loosening performance and high fatigue strength