境界潤滑状態下における車輪•レール間摩擦係数の実験的同定

摘要

When calculating the adhesion coefficient between wheel and rail during rainfall by applying the Mixed Lubrication Theory, the friction coefficient (referred to as boundary friction coefficient) of the contacts between asperities of wheel and rail is one of important parameters. However, its value has been assumed arbitrarily in theoretical calculation so far, therefore, the precision of adhesion coefficient obtained by numerical analysis has been unsatisfied. In order to resolve this problem, this study carries out experiments for estimating the boundary friction coefficient by means of a rolling-sliding friction machine under wet conditions, and find out the boundary friction coefficient is in an average value of 0.5.%境界潤滑条件下の車輪•レール間の摩擦係数を同定するために，2円筒転がりーすベり摩擦力試験機を用いて，幾つかの回転速度，水温，荷重条件下で実験を行った。得られた結果により以下のことが明らかになった。(1)本実験で認められた，回転速度や水温，荷重が最大トラクション係数に及ぼす影響は，従来の研究結果と傾向が一致し，本試験で得られた実験結果は妥当なものであると判断される。