Fundamental on Scoring Failure : 1st report, Initiation and Progress of Scoring on Gear Teeth

Abstract

In order to clarify the initiation and progress of scoring failure on gear tooth flank, scoring tests were carried out using a gear pair of gear ratio 1. The scoring initiates on one tooth pair and then it proceeds or spreads onto successive tooth pairs and finally it covers all the teeth of the gear. The tooth temperature in relation with the driving time takes a steady, saturated value, when no scoring occurs. But when a scoring occurs, the temperature-time curve shows a point of inflection and diverges. These features of scoring phenomena indicate that the analysis of scoring is to be dealt with as a thermal-stability problem.