ころがり疲れに及ぼす相手材料の影響

抄録

The authors carried out an experimental investigation on the rolling contact fatigue using a testing machine of a rotating-disc type orginally designed by the authors, in order to find the best combination of materials for reduction gears of marine turbines. The experimental condition was chosen as follows : diameter of test disc=60 mm, rolling speed=4800 rpm without slip, maximum contact pressure=70 kg/mm², temperature of supplied turbine oil=60°C and rate of feed=1cc/sec. The main results are summarized : The fatigue resistance of the wheel material is considerably affected by the cold working effect due to the rolling contact to the mating pinion material. A harder pinion material raises the fatigue resistance of the wheel material to a great extent. The best result is obtained by the combination of materials which show the greatest cold working tendency. The results are clearly explained by measuring the surface flow of the materials and the progress of the surface hardness.