Oil Flow in Short-Bearing with Circumferential Groove

概要

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A study was carried out on the oil flow in a short-bearing with a circumferential oil groove, in consideration of oil film disintegration and restoration on the unloaded side.(1) The ratio between dimensionless oil flow coefficient of the circumferentially grooved bearing (q_T) and the hydrodynamic flow coefficient obtained by the short-bearing approximation (q_H=2n) was found to be a function of the oil feed capacity number (C_<npf>) only so far as the present experiment is concerned (C_n=2×10^<-3>〜10^<-1>, C_<npf>=5×10^<-2>〜2). Results of the experiment coincided well with the theoretical values.(2) q_T/2n value of the circumferentially grooved bearing converged to zero as C_<npf> increased to a large value, while, in bearings with an axial groove or an oil hole, q_T/2n converged to finite values.(3) In the case of a circumferentially grooved bearing, unlike the other types of bearings, the oil flow could not be divided into two components resulting from the oil-feed pressure and the hydrodynamic film pressure, because the hydrodynamic component itself was affected by the oil-feed pressure.
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