Double Arc Gear Contact Analysis And Applications

The double circular-arc helical gear (DCAHG) has many virtues, such as high carrying capacity, durability, convenient machining, so that it is used in many industries like rock oil, mining, metallurgy. The contact state of gear teeth seriously affects the mesh between gears and dynamics capability, so it is very significative to study the static and dynamic contact performance of DCAHG.This paper primarily represents the study and discussion about computing methods and modeling of load share of contact stress and bending stress of static mesh and dynamic mesh of DCAHG.Based on the equation of tooth faces and outlines, gear tooth parameters are computed, and the nonlinear mesh equation is established. The gear transmission characteristics in fixing error and manufacture error are obtained; some rules and conclusions are found. The equation of tooth load share is built based on the angle displacement compensation principle; load share is gained between teeth and between contact traces, and the error influence on load sharing is analyzed.This paper brings up a new method for solving bending stress and contact stress of DCAHG, and discusses in details the gear static stress distributing under the influence of various errors. A parameter modeling method in ANSYS software is also proposed, by using topology element meshing techniques, based on the character of DCAHG. It can expediently generate canonical top-quality grids.Based on explicit dynamical program ANSYS/LS-DYNA, the dynamic contact computing model (rigid and flexibility model and flexibility model) of gears is built. The change with time of tooth bending stress and contact stress is got, and the stress under the brim contact situation is examined. After analysis, it shows that the results of flexible model are comparatively coincident with the fact.