軸受の摩擦係数におよぼす隙間の影響

概要

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The coefficient of friction of journal bearing is usually shown as μ_f = H√ZN/p, where Z stands for lubricant viscosity, N for rotational speed of Jonrnal, P for load applied per unit projected bearing area, H for the function concerning the position of journal centre.　It has generally been thought that μ_f is decided chiefly by √ZN/p, because the effect of H is not so eminent. But varying the bearing clearance by means of inserting shims between the two half bearings of 50mm diameter and 68mm long, under the condition of N = 258 - 1224 rpm and p = 1.48-l4.12 kg/cm^2, we measured the coefficient of friction of the bearing and gained the following results :　1. The particular clearance is found where μ_f is minimum for each bearing load ; the larger the bearing load, the smaller the clearance is, and the bigger the journal speed, the larger the clearance becomes.　2. This change of μ_f is due to H, that is, the coefficient of friction of the bearing is affected not only by √ZN/p but also greatly by the position of journal centre.　3. Even though ZN/p is constant, μ_f is not unique, because H does change. We found the coefficient of friction became smaller as the number of revolution of the journal became greater for the constant value of ZN/p.
1957-03-30