AGMA 912-A04 pdf free.AMERICAN GEAR MANUFACTURERS ASSOCIATION Mechanisms of Gear Tooth Failures.
This information sheet describes many of the ways 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.
1.1 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.
1.2 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.
2 Normative references
The following standards contain pi’ovisions which are referenced in the text of this information sheet. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based oci this document are encouraged to investigate the possibility of applying the most recent editions of the standards indicated.
ANSI/AGMA 1010- E95, Appearance of Gear Teeth
– Terminology of Wear and Failure
ISO 10825:1995, Gears – Wear and damage to gear teeth – Terminology
3 Analysis
3.1 Failure experience
Gear design is both an art and a science To design better gears, the gear engineer needs good analytical tools plus practical field experience. Gear failures are a part of this experience because they provide valuable information about the multitude of failure modes that can occur. Gear failures should be analyzed to identify the failure mode, and attempt to determine the cause of the failure. Failure analysis can help to find the correct remedy to reduce future problems.AGMA 912 pdf download.