Abstract
The friction loss of spur gears has been studied for a long time, but it has not yet been made clear. In this study, we carried out the experiments to obtain the influence of Rear ratios and center distances on the friction loss of spur gears, using power circulating test equipments. The gear ratios used in these tests were i≒1∼4 and three kinds of center distances were used, that were a=48, 91.5 and 183 mm. Test results showed that the friction loss of gear ratio i=1 is the lowest among other gear ratios if the center distance is constant and the pitch line velocity is the same and also showed the longer the center distance, the lower the friction loss. We showed the mean coefficient of friction in experimental equation concerning with the mean sliding velocity and Hertzian pressure.
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