多孔質ジャーナル軸受の潤滑機構に関する研究 : 両端を密閉した多孔質ジャーナル軸受の運転開始時における静特性

概要

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A theoretical investigation of static characteristics at the start of operation is developed for a porous journal bearing with sealed ends lubricated only by the oil initially provided within its structures. Numerical results show that a negative pressure region exists in the porous matrix just below the oil-film rupture zone. Hence, air penetrates into the porous matrix at the oil-film rupture zone as the oil in the porous matrix moves inwards, which causes the reduction of oil content within the porous matrix. With decreasing Sommerfeld number S_w, the oil-film force f^^^ and the oil leakage flow q^^^_<oce> at the axial ends through the clearance gap increase in the hydrodynamic regime due to an increase of the angular extent of oil-film β, although the values of β and q^^^_<oce> in the mixed regime are constant and are the same as those at the transition point from the hydrodynamic regime to the mixed regime since the value of f^^^ is assumed to be equal to that at the transition point. Furthermore, with decreasing S_w, the coefficient of friction μ decreases in the hydrodynamic regime and then 0steeply increases in the initial stage of the mixed regime. At lower ranges of S_w, μ approaches the value of the coefficient of boundary friction.
一般社団法人日本機械学会の論文
1997-10-25