ANTI-SCORING CAPACITIES OF LUBRICATING OILS (1st REPORT) -CORRELATION BETWEEN SPUR GEAR TEST RESULTS AND TWO-CYLINDER TEST RESULTS OF A BASE OIL-.

As a basis for determining a method for estimating the scoring temperature in a spur gear pair, the anti-scoring capacity of a gear base oil was examined by both spur gear and two-cylinder tests. There was no definite difference between the anti-scoring capacity in through-hardened. Steel cylinders and that in case-hardened ones. In the mixed lubrication state, it is appropriate to estimate the scoring temperature of a spur gear pair from the outer surface bulk temperatures immediately before scoring in the two-cylinder tests, with the bulk temperature being taken as an index. In the estimation, it is necessary to take into account the specific slidings at the tips of the wheel and the pinion, and the decrease in scoring temperature on the approach side due to the tip interference.