Involute modified gear transmission design theory was manaded,the constraint model of modification coefficient choose of the involute planetary gear drive with small teeth difference was established. The choosing-software on modification coefficient of the involute planetary gear drive with small teeth difference was developed on AutoCAD2000.It greatly increase the efficiency and guality designing of the involute planetary gear drive with small teeth difference.
According to machining theory of involute modified gear,all curves that constitute gear profile are achieved. Their equations are also deduced with Visual Basic in SolidWorks.
In the involute modification of gear drive, there is a relationshipξ_1+ξ_2>λ to assure two teeth profiles being engaged without backlash.Inthis paper, the mathematical proof of the relationship is givenfirst and the geometric proof is given by computer graphing.
This paper introduces the interference graph of annular involute gear, that was put forword by some Japenese scholars. The interference graph is drawn according to condition of meither overlaping interference, addendum interference, interim interference, ridial interference, involute interfernce, dedendum cut, nor addendum sharping. The interfernce graph provides the users with data and appraoch for design involute variable-line annular gear.
A computing formula of normal backtash is derived for profile shifted gear driving by centre distance changing bigger. Its influence guantity to normal backlash is analysed by example. The relation of normal backlash, pressure angle and deflection coefficient for designers reference are derived.