1107 ねじ締結, その最適化への提案 : ゆるみ防止及びおねじ応力の低減化機能付きナット・ボルトの開発

概要

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The stress distribution in a tap bolted joint and the pressure distribution on the contact sourface of fixed member have been examined by the three-dimensional photoelastic experiment. The experiment shows that the stress distribution in a bolted joint is axially asymmetrical, because the screw part has an axiasymmetrical shape. The pressure distribution on the contact surface of fixed memmber has the asymmetry corresponding to that stated above. The radial distribution of the contact surface pressure concentrates at the recent part of the tap bolt, while the pressure on the contact surf ace at the outer part of the tap bolt is reduced to almost zero. Namely, the pressure on the contact sur face of the fixed member is not uniformly distributed. In the case of a tap bolt having some part without the thread, i.e. an improved tap bolt, the peripheral portion of the tap bolt can bear the load pressure which has uniform distribution in all directions of circular angles. Thus the cause of loosening due to asymmetrical distribution of pressure on the bearing surface is eliminated. Based on the above matters, actual steel bolt were made, and the loosening test by the vibration normal to axis was carried out. As the result, it was verified and confirmed that the loosening due to the turning of bolt did not occur.
一般社団法人日本機械学会の論文
2003-12-08