Abstract
In order to improve the surface durability of case-carburized gears, the relationship between temperature of rolling-sliding contact surface and inlet oil temperature under the high load condition was investigated. In this study, a 2-roller type contact fatigue testing machine, test rollers and thermocouples were used. In the roller tests under the condition of various lubricating oil temperatures, the following results are obtained in the rolling-sliding contact surface of the high load condition: First, surface temperature rises remarkably compared with inlet oil temperature. Second, surface temperature reaches the maximum after loading and keeps constant. Third, the influence of risen temperature on the strength of material and the mechanism of lubrication cannot be neglected. Fourth, it is possible to lower the surface temperature by lowering the inlet oil temperature. Therefore, it is thought that the surface durability of case-carburized gears can be improved by controlling the temperature of lubricating oil.
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