Abstract
The relation of the scoring occurrence to the temperature and the correlation between the gear test results and the two-cylinder test results were examined with a gear base oil using an IAE type high-speed spur gear test rig. In the mixed lubrication state, a scoring occurrence has intimate relation to the working flank bulk temperature which is not affected markedly by the sliding velocity and the oil-jet direction unlike the maximum contact surface temperature and the integral temperature. The scoring temperature of a spur gear pair can be estimated from the bulk temperatures just before seizures in two-cylinder tests taking the specific slidings and the sliding velocities at the beginning or the end of gear meshing into consideration.
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