Abstract
In a crowned gear pair, which is employed to prevent end tooth bearing. the load distribution in the tooth trace direction is elliptical. In this report. the effects of crowning on the anti-seizure capacity of a gear base oil have been examined by two-cylinder tests at high specific slidings comparing with the results under uniform bearing. The anti-seizure capacity of the gear base oil in the test with crowned cylinders is higher than that in the test with uncrowned cylinders. Though the contact width in the axial direction at seizure becomes small and the Hertzian stress at seizure becomes high as the radius of crowning is decreased, the radius of crowning hardly affects the seizure load. The outer surface bulk temperature just before seizure, which becomes high as the radius of crowing is increased, is hardly affected by the radius of crowning at high sliding velocities.
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