INITIAL TEMPERATURE EVALUATION FOR FLASH TEMPERATURE INDEX OF GEAR TOOTH

In the AGMA standard for the scoring resistance evaluation of gears, f lash temperature is used as an index indicating the risk of scoring. T he flash temperature is expressed as the sum of flash rise of temperat ure and initial temperature. In this research, the initial temperature s are measured for various gear sets in running by thermocouples which are mounted just beneath the working surface of pinion. The effects o f gear dimensions, rotating speed, and lubrication conditions on the i nitial temperature are clarified. An experimental formula is proposed for estimating the initial temperature, which depends on the temperatu re of oil inlet, the frictional power loss, and the running conditions such as rotating speed, contact position, and the oil supply rare. Th e estimated initial temperatures are in good agreement with the measur ed values. The proposed method is available for the scoring resistance evaluation of the vehicle transmissions.