抄録
The bolts and nuts are widely used in various fields as important joining elements with long history. However, loosening induced by the vibration and by the external loads is still a big problem. And the loosening sometimes causes very serious accident without notice. In this paper, two types of special bolt and nut are considered, named "Super Stud Bolt (SSB)" and "Super Lock Nut (SLN)" which can prevent loosening effectively. In this kind of bolt and nut, the thin walled tube between the upper threads and the lower threads can be deformed along the axial direction so that the phase difference is produced. This phase difference induces the contrary forces on the surfaces of the upper threads and the lower threads, which bring out the anti-loosening performance. In this study, the anti-loosening performance is analyzed and realized with the finite element method. Moreover, the anti-loosening performances under various phase differences are compared and finally best dimensions for SSB and SLN are examined.
