In trying to clarify the effect of molybdenum disulfide film on the scoring resistance and the wear characteristics of gears, various tests on balls and gears coated with MoS2 film have been run. From the test results obtained with a four-ball machine and a power-circulating gear machine it was found that the effect of the MoS2 film was small on the seizure load of the balls. In contrast, the effect of the MoS2 film on the scoring resistance of the gears was significant, and the development of the gears of which the load-carrying capacity against scoring is considerably large could be made.

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