Load endurance tests have been conducted to obtain allowable surface compressive stresses for materials required for
strength and high reliability of power gears. The following JIS materials were used in conducting the tests: spheric
graphite cast iron, G5502; carbon steel, G4051 and steel G4502. Using a designed gear with module 4 and 20 degree
pressure angle as a prototype, load endurance tests were conducted. and data concering tooth damage was accumulated.
The results of these tests and comparison of the durbility of the materials are presented in this paper.
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