handbook of practical gear design.pdf

Handbook of Practical Gear Design Darle W. Dudley Consultant Dudley Technical Group, Inc. TECHNOMIC ^PUBLISHING CO.. INC.) I ,ANCASTER ? BASET contents Foreword xiii Preface xv chapter 1 GEAR-DESIGN TRENDS Manufacturing Trends Small, Low-Cost Gears for Toys, Gadgets, and Mechanisms Appliance Gears Machine Tools Control Gears Vehicle Gears Transportation Gears Marine Gears Aerospace Gears Industrial Gearing Gears in the Oil and Gas Industry Mill Gears vii viii CONTENTS Selection of the Right Kind of Gear External Spur Gears External Helical Gears Internal Gears Straight Bevel Gears Zerol Bevel Gears Spiral Bevel Gears Hypoid Gears Face Gears Crossed-Helical Gears (Nonenveloping Worm Gears) Single-Enveloping Worm Gears Double-Enveloping Worm Gears Spiroid Gears chapter 2 PRELIMINARY DESIGN CONSIDERATIONS Stress Formulas Calculated Stresses Gear-Design Limits Gear-Strength Calculations Gear Surface-Durability Calculations Gear Scoring Thermal Limits Preliminary Estimate of Gear Size Gear Specifications Size of Spur and Helical