Load Carrying Capacities of the Coated Gear in Ultra-high Vacuum and Establishment of Inspection System to Tooth Surface Failure.

在动力循环齿轮机上研究了表面热扩散镀镍的不锈钢齿轮（SUS440C）在润滑脂润滑和干摩擦条件下的摩擦磨损特性以及齿轮摩擦损失转矩与传递转矩的比值。在润滑脂润滑的情况下，用全氟聚醚基润滑脂和在基润滑脂中以30%质量%的比例混合二硫化钼添加剂的润滑脂润滑齿轮。试验在空气和约10^<-4> Pa的真空中进行。进一步，为弄清扩散层对齿角处应力的影响，进行了齿轮齿的弯曲疲劳试验。得到以下结果：(1)在真空条件下，加入二硫化钼添加剂：质量%为30的润滑脂润滑后，带扩散层齿轮达到破坏性表面破坏的时间比不添加添加剂的齿轮长30%左右。(2)空气中扩散层使齿轮达到破坏性表面破坏的时间比真空中短57%左右。(3)齿轮摩擦损失转矩与齿轮传递转矩之比随着转数总和的增加而减小，小齿轮转数达到10^5，在0.01 ~ 0.015之间。(4)有扩散层齿轮的弯曲疲劳强度约为450 Mpa，比无扩散层齿轮的弯曲疲劳强度大约50 Mpa。

The frictional and wear characteristics, and ratio of gear frictional loss torque to transmitted torque of the stainless steel gears (SUS440C) of which the surface layr was thermally diffused after being Snplated were investigated by a power-circulating gear machine under the conditions of grease lubrication and dry friction. For the case of grease lubrication, the gear was lubruicated with the base grease of perfluro-polyether and the grease in which MoS2 additives were mixed at the rate of 30 mass% in the base grease. The tests were run in air and in vacuum of about 10^<-4> Pa.Further, to clarify the effect of the diffused layr on the stress at the tooth fillet, the bending fatigue test of the gear teeth was carried out. The following results were obtained ;(1) In the case of the tests in vacuum, the time to reach destructive surface failure of the gears with diffused layr when lubricated with the grease (MoS2 additives : 30 mass%) was about 30% larger than that without the addtitives.(2) The time to reach destructive surface failure of the gears with the diffused layr in air was about 57% smaller than that in vacuum.(3) The ratio of gear frictional loss torque to transmitted torque of the gears decreased with increasing the sum of the number of revolution while the number of revolution of the pinion reached 10^5, and was between 0.01 and 0.015.(4) The bending fatigue strength of the gears with the difused layr was about 450 Mpa, and was about 50 Mpa larger than that without the diffused layr.