ゆるみ防止機能を有するハイパーロックナットの開発 : 第1報,三次元有限要素法による弾塑性解析(機械要素,潤滑,工作,生産管理など)

概要

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Bolted joints are widely used in mechanical structures since the disassembly for maintenance is easy without high cost. However, vibration induced loosing,due to dynamic loading has been unsolved subject for a long time. We have developed a new type of nut named 'hyper lock nut (HLN), which realizes anti-loosening performance without complicated tightening process and tool. In this study, we have investigated the mechanisms of bolted joint with HLN, and tightening behavior are analyzed by mean of three-dimensional finite element method. Results are compared with the experimental results for HLN.- Good qualitative agreement is observed between analytical results and experiments with respect to displacement, tightening force and tightening torque. We found some new aspects and superior points for bolted-joint with HLN than that of standard nuts. It is found that tightening torque of HLN is higher than that of standard. It is also found that the antiloosening performance can be realized by the thread contact force at the slit region and angular facing on bearing surface. Moreover, by mean of tensile and fatigue experiments, it is concluded that HLN involves sufficient strength in practical use.
一般社団法人日本機械学会の論文
2007-03-25