Abstract
The tooth surface strength and wear of case hardened spur gears were studied in order to clarify them from the view point of tooth forms and pitch line velocities and also to obtain higher tooth surface strength than ever found. The test results showed that the face width influences a little on the tooth surface strength in the case of the face width being small. The cutter pressure angle and the profile shift do not influence on the tooth surface strength shown with Hertzian pressure, but these factors affect the power transmitting capacities very much. The tooth surface strength of case hardened in a vacuum gears and that of MoS2 coated gears are about 15% and 30% higher than that of usual case hardened gears respectively.
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