An Infra-red Technique for the Measurement of Gear Tooth Surface Temperature

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Abstract
Work in the field of gear tooth surface distress during recent years has shown clearly that surface temperature history provides the key to performance predictions. This especially applies when using an EP oil. Many attempts have been made to monitor surface temperature by using a variety of thermocouple designs. None of these attempts has resulted in the developing of a practical tool and all interfere with the surface continuity and can initiate scoring. An infra-red technique offered a satisfactory solution to this temperature measurement problem if the complexities of calibration could be resolved. This paper describes how a satisfactory technique was evolved along with results of proving tests when applied to a spiral bevel pair. Also included is the surface temperature history of a score/recovery mechanism. A practical tool for the measurement of gear tooth surface temperature has been developed and, slightly modified, the same technique is now being applied to temperature measurements within a rolling element bearing by the insertion of a sapphire window into the bearing tracks.

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