Study on the Scoring Resistance of Lubricating Oil in Two Cylinder Test : 2nd Report, Seizure Behavior under Pure Sliding Contact Condition

Abstract

In this paper, the practical equations to calculate maximum contact surface temperature in Two Cylinder test were proposed. Moreover, for non-EP additive mineral oil, the effect of sliding velocity on the seizure behavior under pure sliding contact condition using through-hardened cylinders of S45C steel and the relation between seizure and temperature were investigated. As the result, the following conclusions are deduced : Bulk temperature of outer surface of cylinder can be approximated by the temperature at r^^-=0.97 and the circumferential position of ψ where bulk temperature rise of outer surface of cylinder is defined in the transverse section which passes through the end of contact region in axial direction. Seizure behavior is classified into two forms. One is such a form that when sliding velocity ν_s ≨ 1.26 m/s initial and destructive seizures occur at different loads after lasting boundary lubrication condition, and the other is such a form that when ν_s > 1.26 m/s destructive seizure suddenly occurs with a metallic sound from the state that oil film is retained and coefficient of friction is small. Thermal resistance of boundary lubrication film in initial seizure is related to maximum contact surface temperature.