有限要素解析による大型車用ホイールボルトの締め付け特性の評価(機械要素,潤滑,工作,生産管理など)

概要

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Recently, tire coming-off accidents of large vehicles are frequently occurring and threatening the safety of civic life. It is reported that these accidents are primarily caused by the fatigue failure of the wheel bolt. Ordinary large vehicles have the so-called double-tire structure, and its inner and outer wheels are tightened successively in two stages. Although the tightening torque is specified for each stage, it is difficult to estimate the amount of final bolt force generated in wheel bolts, since the two-stage tightening operation involves complicated mechanical behavior. In this paper, the relationship between the applied torque and the resulting bolt force has been derived by means of finite element analysis. The numerical analyses have also shown that the repeated tire replacements might cause the scatter of bolt preloads and lead to the tire coming-off accidents. The validity of the proposed equation relating torque and axial bolt force has been testified by experimentation using a test setup composed of the actual parts of large vehicles.
2009-02-25