Abstract
In this report, the friction and wear of austenitic stainless steel spur gears of which the surface layer was thermally diffused after being Sn-plated were exammined in high vacuum. Gear tests were carried out under grease lubrication and dry friction in vacuum of about 2 x 10-3 Pa using a power-circulating gear test rig. From the tests, the following results were obtained. ( 1 ) In the case of grease lubrication, the ratio of the gear frictional loss torque to the transmitted torque was in the range of 0. 01 to 0. 05. ( 2 ) The time to reach destructive surface failure of the gears due to thermally diffused treatment was significantly long. This long time was observed in both dry friction test and grease lubrication one. The optimum diffused layer thickness was about 4 μm in the case of grease lubrication. ( 3 ) The acceleration of the gear box when the gear tests could not proceed due to destructive surface failure was significantly increased, and then the destructive surface failure could be detected by means of the measurement of acceleration due to vibration of the tested gear box.
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