3243 ホイールボルト軸直角力の測定(J07-3 締結・接合の力学とプロセス(3),J07 締結・接合の力学とプロセス)

概要

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Loosening of the wheel nuts may be the cause of accidents where the wheel falls off while the automobile is running. When the transverse force of wheel bolts exceeds a certain proportion of the bolt shaft force, the wheel nut begins to loosen. The results of 3-dimensional numerical analysis established that the transverse force was influenced by the bolt shaft force caused by the bolt fastening. When the transverse force of wheel bolt exists, disproportional force acts the nut seat and it appears as pressure distribution in the contact surface of nut seat. In this study, the pressure distribution in the nut seat is measured using the pressure measuring film to obtain the transverse force of wheel bolt. It is clear that the results, the pressure in the contact area of nut seat when whole 8 wheel nuts are tightened is far larger than that when only one wheel nut is tightened although the bolt shaft force are identical with each other, and the fact indicates that the transverse force of wheel bolt caused by the bolt shaft force exists.
2006-09-15