Abstract
The power losses of spur gear drive change with the gear rotation speed. When gears rotate at a high speed, churning loss occupies the large part of the power loss in the gear drive. In this study, we investigated the effects of the driving conditions on the churning loss of gear drive. In the experiment, the churning losses of spur gears with three kinds of modules were measured in oil bath lubrication. Then, we discussed the effects of lubricating oil and gear speed on the churning loss. As a result of this study, it is found that the oil viscosity has an influence on churning loss except using traction oil, high gear speed provides large churning torque, and large module of the gear has large churning torque.
