Abstract
A quasi-analytical model based on fluid mechanics is established to estimate the no-load power losses of a spiral bevel gear with splash lubrication. The no-load losses are defined as the sum of churning power loses and windage power losses. Then, the model is applied to different spiral bevel gears to measure the distributions of each individual power loss in the overall no-load losses, and the results agree well with sets of experimental findings. Considering windage effects, the impacts of rotating speeds, lubricating oil properties, and gear geometries parameters on churning losses are also quantified at low or moderate speed. Finally, by introducing the dynamic immersion depth, efforts are also made to explain uncommon behavior of the churning drag that the torque decreases with increasing of the rotating speed. A simplified evolution model of the dynamic immersion depth related to the Froude number inspired by the published work is presented to understand the churning behavior of bevel gears at moderate speed.
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