Abstract

Info

Author(s):: ZHAO Xiang-fei; ZHANG Jing-cai; LIU Hong-qi; WANG Bao-chao; 1. China Certification Center for Automotive Products, China Academy of Machinery Science and Technology, Beijing 100044, China; 2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

Keywords:: mechanical engineering; involute gear; finite element; tooth fillet; bending stress

Abstract:: Gears are important components on the vehicle. Combined with meshing theory, parameterized finite element model was established by APDL to improve the involute gear bending fatigue strength. The research introduced rational quadratic Bezier curve to describe the gear tooth root fillet. Optimization method in ANSYS was used to optimize the Bezier curve to reduce tooth root bending stress. Analytical method was conducted to verify the results of optimization and three-dimensional contact analysis was used to analyze meshing gear. The results show that: For a given parameter gear, tooth root bending stress of optimized gear is reduced by about 21%, compared to the unoptimized gear. Analytical and numerical simulation results are basically the same and this verifies the optimization results; The equivalent contact stress is basically unchanged and contact stress of three-dimensional analysis is decreased slightly; Due to different load positions and different FEA, reduction percentage of bending stress is less than above. But in the whole, optimized gear exhibits higher bending strength than the unoptimized gear on the condition of slight improvement of contact strength which benefits for gear drive.