極端にゆるみにくいねじ締結体の開発

概要

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The purpose of this paper is to present the development of effective antiloosening screw fasteners which are very resistant to loosening without sacrificing any of the advantageous features of conventional screw fasteners. Two factors cause loosening of screw fasteners. One is relative slip between the bolt and the nut screw thread. The other is relative slip between the bearing surface of the bolt or nut and the surface of fastened material. Prevention of loosening could be realized if either one of these causes were eliminated. In order to eliminate relative thread slip, we developed a new screw called the "step-lock bolt". This bolt has 8 steps in one helical circumference. Bolts of size M8 with the new shape were made by the rolling process. The performance of the bolts fastened with conventional nuts was examined and the efficacy in preventing loosening was discussed. The results show that a step-lock bolt fastened with a force of 12kN or higher does not loosen.
一般社団法人日本機械学会の論文
1996-05-25