AGMA 912-A04:2004 Edition

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Mechanisms of Gear Tooth Failures

Published By	Publication Date	Number of Pages
AGMA	2004	30

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Category: AGMA

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Description

This information sheet describes many of theways in which gear
teeth can fail and recommends methods for reducing gear failures.
It provides basic guidance for those attempting to analyze gear
failures. The information sheet should be used in conjunction with
ANSI/AGMA 1010–E95 in which the gear tooth failure modes are
defined. Similar definitions can also be found in ISO 10825. They
are described in detail to help investigators understand failures
and investigate remedies.

The information presented in this document applies to spur and
helical gears. However, with some exceptions the information also
applies to bevel, worm and hypoid gears. Discussion of material
properties is primarily restricted to steel.

System investigations

Gear system dynamic problems are beyond the scope of this
information sheet. However, it is important to recognize that many
gear failures are influenced by problems with the gear system, such
as high loads caused by vibration. When investigating gear
failures, it is necessary to consider that the cause may stem from
a problem with the system rather than the gears.

Analysis by specialists

It is not the intent of this information sheet to discuss the
details of disciplines such as dynamics, material science,
corrosion or tribology. It is hoped that the material presented
will facilitate communication in the investigation of gear
problems.

Additional information