Abstract

This paper studies the computerized tooth profile generation of involute gears cut with rack-type cutters. Based on the theory of gearing the mathematical models of generating cutter with asymmetric involute teeth and generated involute gears are given. Beveloid (conical involute) gears are considered for a generalized type of involute gearing for connecting parallel shafts. Effective limits of involute design parameters that determine the actual tip circle radii of the generated gears are investigated. An approach based on contact path of mating gears is proposed to eliminate further operations for standard value of tip circle radius. Computer simulation programs are developed to obtain graphs of generating tools and generated teeth surfaces.

Highlights

  • Computer simulation of involute gear generating process has been studied by various authors

  • In the papers about mathematical modeling of the generating and generated teeth surfaces, the limits of involute region design parameters are given for exact geometry of the cutter but obtained gear teeth profile may extend above the standard tip circle

  • Fundamental law of gearing states that the common normal to the transverse section of the cutter and the gear tooth surface must pass through the instantaneous center of rotation

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Summary

Introduction

Computer simulation of involute gear generating process has been studied by various authors. In the papers about mathematical modeling of the generating and generated teeth surfaces, the limits of involute region design parameters are given for exact geometry of the cutter but obtained gear teeth profile may extend above the standard tip circle. This fact can be observed in the papers about pinion-type generation [6,15,22,23] and rack-type generation [5,7,12,13,14] for example.

Mathematical model of generating cutter
Mathematical model of generated gear
Tooth profile analysis on the plane of rotation
Contact path and determination of effective parameter limit
Computer applications
Results
Conclusions

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