Basic design of spur, helical and bevel industrial gear units

The following pages are from a publication I wrote about 17 years ago. It was intended for publication in one of the DATA books by the old draughtsman's union. However it was never accepted, the reason being it was not suitable at that time. They stopped producing the booklets after that so I hope the reason given was correct and that it wasn't because it was a load of @;~#@@.

Judge for yourselves.

Remember it is 17 yrs old and a lot of things could have changed, especially steel specs.

Also, most of this is scanned in using an OTR program, and although I'm checking it some things may escape me.

Also the Web Pages seem a bit disjointed, email me if you want the original Word document - it is laid out better

BASIC DESIGN OF SPUR, HELICAL AND BEVEL INDUSTRIAL GEAR UNITS

Introduction

To the competent engineer, the design of a gear unit, like any other machine, may seem a fairly easy task. However without experience in this field the designer cannot be expected to cover all aspects of gearbox design.

The purpose of this booklet is to set out the basic design for an industrial gearbox. It should help designers and draughtsmen not familiar with gearboxes, lay out a reliable working design. And it is intended for the reader to use his own experience in selecting formulae, stress values etc., for gearbox components. To this effect a list of further useful reading is included at the back of this booklet.

An industrial gearbox is defined as a machine for the majority of drives requiring a reliable life and factor of safety, and with the pitch line velocity of the gears limited to below 25 m/s, as opposed to mass produced gearboxes designed for a specific duty and stressed to the limit, or used for very high speeds etc., e.g. automobile, aerospace, marine gearboxes

CONTENTS

Click here for CHAPTER I

BASIC SIZE AND SELECTI ON.

Straight or Helical

Selection Torque

Materials and Heat Treatment

Through Hardened

Flame or Induction Hardened

Nitrided

Case Carburised and Hardened

Sizing the Unit

Click here for CHAPTER II