Abstract
This study focuses on the phenomenon of oil trapping in the tooth spaces of spur gears. It presents the first obtained results in order to provide an estimation of the power losses due to the compression of the oil trapped between the inter teeth meshing spaces in a high-speed transmission for internal and external spur gears. It first allows, to model the inter teeth spaces at any time and offers limits for the trapped fluid volume and axial and radial discharge surfaces. The discretization impact result is discussed.Then, the influence of certain design and operating parameters such as module, pressure angle, addendum modification coefficient and rotational speed on these discharge surfaces and trapped volume is presented.
Highlights
In gear transmissions, tooth lubrication is necessary to cool surfaces
Several studies on gears try to prevent their deterioration, to improve performance and minimize power losses. These may be due to frictions [1] or in relation to ambient air via the ventilation phenomenon called aerodynamic losses [2] or in connection with lubricant that depends on the type of lubrication, this is the case of losses by churning or by trapping fluid between gear teeth at high rotational speeds
There are only few available published studies on the modeling of oil trapping between mating gears
Summary
Several studies on gears try to prevent their deterioration, to improve performance and minimize power losses. These may be due to frictions (friction loss) [1] or in relation to ambient air via the ventilation phenomenon called aerodynamic losses (windage loss) [2] or in connection with lubricant that depends on the type of lubrication, this is the case of losses by churning (churning loss) or by trapping fluid between gear teeth at high rotational speeds (trapping loss). There are only few available published studies on the modeling of oil trapping between mating gears
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