Study on the Scoring Resistance of Lubricating Oil in Two Cylinder Test : 3rd Report, Seizure Behavior under Rolling-sliding Contact Condition and the Relation between Seizure and Temperature in Non-EP Gear Oil

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In this paper, the effects of specific sliding and sliding velocity on the seizure behavior of non-EP gear oil under rolling-sliding contact condition were revealed. And the relation between seizure and temperature was examined considering the lubrication state of frictional surfaces before seizure. As the result, the following conclusions are deduced : (1) Specific film thickness (ξ_0)_<DS> just before destructive seizure which makes further operation impossible is significantly affected by specific sliding and sliding velocity. (2) When (ξ_0)_<DS>≦0.3 where a destructive seizure occurs after lasting boundary lubrication, seizure occurrence is more related to maximum contact surface temperature. Maximum contact surface temperature (T_<cmax>)_<DS> just before destructive seizure decreases as specific sliding increases. (T_<cmax>)_<DS> in sliding contact is in the range of 456 to 477 K, which gives the reference value of the thermal stability of the boundary lubrication film. (3) On the other hand, when (ξ_0)_<DS>>0.3,seizure occurrence has intimate relation with bulk temperature of outer surface of cylinder T_b. (T_b)_<DS> just before destructive seizure decreases as specific sliding increases.
一般社団法人日本機械学会の論文