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Gear Knowledge

The essential knowledge needed for gear design

To design gears, it is necessary to have technical knowledge of gears as mechanical element. This is true even when using already designed standard gears.

Among the required knowledge are various formulas for calculating gear strengths and sizes, knowledge regarding the gear types and specialized vocabulary, gear train's speed ratios and rotational directions, teeth forms and teeth thicknesses, backlashes, precision classes of ISO and AGMA, the accuracy of gear assembly, materials and heat treating which are mainly related to hardness, lubrication in applications, how to ameliorate problems related to noise and breakage, geometric tolerances and special geometric symbols used in mechanical drawings, etc.

Starting with the level of user's knowledge, it is necessary to offer multiple levels of technical data in order to successively understand more advanced knowledge regarding the topics listed above. Accordingly KHK has prepared the following four kinds of PDF formatted data. For knowledge that cannot be explained by the four kinds of technical data, we have added separate Q&A sections divided into fields of manufacturing, technology and products. For the future, we are also planning to publish a gear calculation software.

Related links :
Spur Gears - Main page of spur gears
Gear Rack - Main page of gear rack
齿轮知识 - 中文页

button of gear selector

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The ABCs of Gears - A

What is a gear ? An introduction to simply explained history and applications of gears. We recommend it for those just starting to learn about gears.


The ABCs of Gears - B

The intermediate level which presents a detailed explanation of types of gears and tooth forms and precision, heat treatment, surface treatment, production methods, etc.


Introduction to Gears

Intermediate level text almost same level as B. Includes comments on gear inspection and noise, manufacturing facility, etc.


Gear Technical Reference

Comprehensive data and synthetic technical reference needed when designing machines and gears and when studying gear knowledge.


Introduction To Gear Trains Analysis

Gear Technical Textbook written by All Merit Enterprise, Taiwan


Gear Nomenclature

This page aims to present gear related basic terminology.


Q&A about Gears

Q&A about the technical details of gears


Types and Mechanisms of Gear Reducers

Here, the types and their mechanisms of geared speed reducers are introduced.

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