Tooth Contact Analysis for Helical Gear of the Differential Applied to Electrical Vehicle

• Main Authors: Chu, Kuo-chen, 朱國禎
• Other Authors: 李政男
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/26393822334723718794

碩士 === 正修科技大學 === 機電工程研究所 === 97 === A differential is a device that allows a difference in velocity between two wheels. One of the applications is in the final drive mechanisms of electrical vehicles. When a four-wheeled vehicle turns, the wheels on the outside of the turn must travel farther than the inside wheels due to their different turning radii. The helical gears drives used as the reduction mechanism in the differential of electrical vehicle. Helical gears that transform rotation between parallel axes in opposite directions are in external meshing. In order to verify the design parameters of helical gears, in this thesis the equations of tooth surfaces and stress analysis are implemented. Based on the conjugate surface theory, homogeneous coordinate transformation and differential geometry, the equations of tooth surfaces of the involute helical gears are derived and the meshing of mating helical gears is analysed. The principal curvatures and the principal directions of the tooth surface both are evaluated. The bending and contact stress of contacting surfaces are calculated through the AGMA standard and the finite element method. The derivation of CAD model in the FEM is based on application of the equations of tooth surfaces.