線接触混合弾性流体潤滑下の突起間干渉状態の理論解析

概要

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The numerical calculation method, previously developed for unsteady elastohydrodynamic lubrication with direct contact, was applied to an anlysis of asperity interaction in line contact. In order to elucidate how the micro-EHL effects are induced by asperity interaction, an analysis for rolling-sliding contact of two cylindrical surfaces with regular sinusoidal micro-geometry was conducted firstly. When a rough surface and a flat surface make rolling contact at a slip ratio, a micro-wedge action typically appears. On the other hand, if both two surfaces have sinusoidal roughness with a same wavelength, a volume of oil which is sandwiched between quickly moving asperity and slowly moving asperity is compressed and a micro-squeeze effect might be caused. It is shown that this micro-squeeze action could cause higher pressure than direct elastic contact even though oil-film exists. Also in the case of random surfaces produced by fractal FFT method, the peak of pressure could rise to very high value without direct contact. The generation of high pressure by micro-squeeze action might become to a cause of rolling fatigue failure.
一般社団法人日本機械学会の論文
2000-09-25