Fundamental on Scoring Failure : 3rd Report: Improvement of Scoring Model and Definition of Scoring Index

概要

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The differential equation which expresses the temperature of rolling/sliding contacting bodies is so improved that the measured surface bulk temperature of gear teeth and of contacting rollers as a function of running time coincide quantitatively well with the simulating results. When the running time vs surface bulk temperature curve has a point of inflection, the temperature diverges and a scoring failure occurs, that is, the thermal stability expressed by this differential equation corresponds to the occurrence of a scoring failure. Because the thermal stability of the differential equation is decided by its coefficients, the scoring index is defined using these coefficients : Theoretical analysis shows, that when this scoring index is less than 0.9, a scoring failure does not occur, and when this scoring index is larger than 1.0, a scoring failure occurs. The scoring test using a power circulating gear test rig has confirmed the propriety of this scoring index.
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