Modification of the Tooth Geometry of a Polymer GEAR with a Straight Tooth Line to Adjust the Torque Transmission Capability in One Direction Only

Piotr Strojny Piotr Strojny

doi:10.31648/ts.6914

Abstract

This paper describes a methodology for modifying a tooth for the ability to transmit torque in one direction only. It presents two methods (analytical and numerical) of tooth mass reduction while maintaining functional features of the whole transmission. The results of the above mentioned methodology are presented on the example of a mass-produced transmission.

Highlights

A significant percentage of devices incorporating gears are based on the principle of torque transmission in one direction only
It is worth to mention that the literature analysis did not come across any items that directly refer to the modification of the tooth geometry made of polymeric materials
On the basis of the obtained results it may be concluded that the proposed methods of tooth modification allow to decrease the tooth mass and of the whole transmission

Summary

Introduction

A significant percentage of devices incorporating gears are based on the principle of torque transmission in one direction only. The gears in them use only one side of the tooth for direct torque transmission. This situation raises the important question of whether, and to what extent, the teeth of such gears can be modified in terms of the removal of unnecessary material, finishing treatments such as grinding, and heat treatments on the side of the tooth that. It is worth to mention that the literature analysis did not come across any items that directly refer to the modification of the tooth geometry made of polymeric materials. 2021), the supplier of polymers for Zelmer company, provided information about the material of which the above mentioned transmission is made. According to the kinematic diagram (Fig. 1) and the data from Tables 1 and 2 using the relationships (1) and (2) (Dziama et al 1995, Ochęduszko 1985), stress values at the tooth base and contact stresses (Hertz formula) were estimated: σσgg

FF h bb ss2

Method

Findings

Conclusions