The spur planetary gear torsional stiffness and its crack sensitivity under quasi-static conditions Song Xue, Rodney Entwistle, Ilyas Mazhar and Ian Howard* Department of Mechanical Engineering, Curtin University, Bentley, Western Australia, Australia Department of Mechanical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia * Corresponding author. Phone: (+61) 89266 7047. E-mail: [email protected] Abstract: The sun-planet and ring-planet tooth mesh stiffness variations and the resulting transmission errors are the main internal vibration generation mechanisms for planetary gear systems. This paper presents the results of torsional stiffness analysis of involute spur planetary gear systems in mesh using finite element methods. A planetary gear model with three planet gears and fixed ring gear and its subsystem models have been developed to study the subsystem and overall torsional stiffnesses. Based on the analysis of torsional mesh stiffness, predic- tive models for single branch sun-planet-ring and overall planetary gear torsional stiffnesses have been proposed. A crack coefficient was introduced to the sun-planet and ring-planet meshes to predict the effect and sensitivity of changes to the overall torsional mesh stiffness. The resulting mesh stiffness crack sensitivity of the overall gear system was analysed under quasi-static conditions. It was found that the carrier arm stiffness has great influence on the crack sensitivity while the overall stiffness was most sensitive to the crack on the sun-planet mesh. Keyword: planetary gear, FEA method, subsystem torsional stiffness, overall torsional stiffness, crack sensitivity
The spur planetary gear torsional stiffness and its crack sensitivity under quasi-static conditions
May 23, 2023
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