巨視的座面すべりがない場合のねじのゆるみ挙動 : 軸直角方向繰返し外力下のゆるみ機構

概要

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It is considered that the self-loosening with returning rotation of screw thread can occur in threaded joints under transversely repeated force even when the macroscopic slide is absent on the bearing surface. The above loosening can be expected to be relatively small, but should be noticed because it can become to be a start toward a serious loss of fastening force. This paper presents an approximate solution for the loosening mechanism in this case. An elastic torsion of bolt-shank produced in the relative movement between mating threads and a moment endurable on the bearing surface being regarded as basic factors of loosening, a theoretical consideration is prompted. Especially paying attention to behavior of the above elastic torsion and the loss of fastening force, an experimental examination of the theory is performed in a static condition. Consequently, it is shown that a basic appearance of loosening may be explained fairly well by the theory.
公益社団法人精密工学会の論文
1988-07-05