Tooth Contact Analysis of New-style Unsymmetric Involute Gear with Double Pressure Angles

摘要

Because the pressure angles have an effect on load capacity of involute gear, the unsymmetric involute spur gears were designed which had different pressure angles on the drive side and coast side. Rational design of the unsymmetric tooth profile could lead to an increase in load capacity, a reduction in noises and vibration levels.This papers developed parametric design programs of total tooth model of unsymmetric and symmetric involute gear by Autolisp language. It was proposed that the boundary conditions of thermal transmission model and calculation formula of frictional heat flux for unsymmetric gear. Then the total models were transferred into ANSYS.On the basis of the mechanism of time-variant gear scuffing, the transient bulk temperature fields of the unsymmetric and symmetric gears were solved by finite element analysis. The results show that the maximum bulk temperature of unsymmetric gear is lower than symmetric gear on steady conditions and unsymmetric gear can efficiently improve the scuffing load capacity and decrease the contact stress of tooth face. So this new-style gear has a better future for application.