Table of Contents

Foreword
Introduction
1 Scope
2 Normative references
3 Symbols and terminology
4 Formulae for calculation of dimensions
5 General
6 Geometrical data to be known for calculation
7 Forces, speeds and parameters for the calculation of
   stresses
8 Efficiency and power loss
9 Wear load capacity
10 Surface durability (pitting resistance)
11 Deflection
12 Tooth root strength
13 Temperature safety factor
14 Determination of the wheel bulk temperature
Annex A (informative) - Notes on physical parameters
Annex B (informative) - Methods for the determination of the
        parameters
Annex C (informative) - Lubricant film thickness according to
        EHL - theory
Annex D (informative) - Wear path definitions
Annex E (informative) - Notes on calculation wear
Annex F (informative) - Notes on tooth root strength
Annex G (informative) - The utilisation of existing tooling for
        machining of worm wheel teeth
Annex H (informative) - Adaptation of equations for the reference
        gear to own results of measurements
Annex I (informative) - Life time estimation for worm gears with
        a high risk of pitting damage
Annex J (informative) - Examples
Bibliography

Abstract

Describes equations for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Organization for Standardization
Pages
ISBN
Committee	TC 60
Supersedes	ISO/DIS 14521 : 40.60 (2006)