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It is intended that this document serve as a general guideline and source of information about conventional lubricants, their properties, and their general tribological behavior in gear contacts.
It has been introduced as an aid to the gear manufacturing and user community. Accumulation of feedback data will serve to enhance future developments and improved methods to evaluate lubricant related wear risks. It was clear from the work initiated on the revision of AGMA Standards C95 and C95 metric version that supporting information regarding lubricant properties and general tribological knowledge of contacting surfaces would aid in the understanding of these standards.
The information would also provide the user with more tools to help make a more informed decision about the performance of a geared system. This information sheet provides sufficient information about the key lubricant parameters to enable the user to generate reasonable estimates about scuffing and wear based on the collective knowledge of theory available for these modes at this time.
In Harmon Blok published his theory about the relationship between contact temperature and scuffing. This went largely unnoticed in the U. The Blok flash temperature theory began to receive serious consideration as a predictor of scuffing in gears.
The methodology and theories continued to evolve through the s with notable contributions from Dudley, Kelley and Benedict in the areas of application rating factors, surface roughness effects and coefficient of friction. The s saw the evolution of gear calculations and understanding continue with computer analysis and factors addressing load sharing and tip relief issues. The AGMA Aerospace Committee began using all the available information to produce high quality products and help meet its long--term goal of manned space flight.
Specifically, the subcommittee targeted the effect lubrication may have on gear surface distress. As discussions evolved, it became clear that this should be a stand alone document which will hopefully serve many other gear types. This should be considered a work in progress as more is learned about the theories and understanding of the various parameters and how they affect the life of the gear. Suggestions for improvement of this document will be welcome.
It is intended to serve as a general guideline and source of information about gear oils, their properties, and their general tribological behavior in gear contacts. Manufacturers and end-users are encouraged, however, to work with their lubricant suppliers to address specific concerns or special issues that may not be covered here such as greases. The equations provided herein allow the user to calculate specific oil film thickness and instantaneous contact flash temperature for gears in service. These two parameters are considered critical in defining areas of operation that may lead to unwanted surface distress. Surface distress may be scuffing adhesive wear , fatigue micropitting and macropitting , or excessive abrasive wear scoring. Each of these forms of surface distress may be influenced by the lubricant; the calculations are offered to help assess the potential risk involved with a given lubricant choice. Flow charts are included as aids to using the equations.
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