AGMA 925-A03 PDF

AGMA A03 AMERICAN GEAR MANUFACTURERS ASSOCIATION Effect of Lubrication on Gear Surface Distress ii. Effect of Lubrication on Gear Surface. AGMA A03 Gear Manufacturers CAUTION NOTICE: AGMA technical publications are subject to constant improvement, revision or withdrawal as dictated. AGMA A Effect of Lubrication on Gear Surface Distress. standard by American Gear Manufacturers Association,. View all product details. Most Recent .

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SCOPE This information sheet is designed to provide currently available tribological information pertaining to oil lubrication of industrial gears for power transmission applications.

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 agmx 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 wearfatigue micropitting and macropittingor 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 952-a03 risk involved with a given lubricant choice.

Flow charts are included as aids to using the equations. 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 surface distress.

Item Detail – AGMA A03 (reaffirmed January )

One of 925-a30 key parameters is the estimated film thickness. This is not a trivial calculation, but one that has significant impact on overall performance of the gear pair. It is considered in performance issues such as scuffing, wear, and surface fatigue.

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This information sheet provides sufficient information about key lubricant parameters to enable the user to generate reasonable 925-x03 about surface distress based on the collective knowledge available. Blok [1] published his contact temperature equation in It went relatively unnoticed in the U. Kelley found it necessary to couple the coefficient of friction to surface roughness of the gear teeth. Kelley recognized the importance of load sharing by multiple pairs of teeth and gear tooth tip relief, but he did not 92-5a03 equations to account for those variables.

Benedict and Kelley [5] published their equation for variable coefficient of friction derived from disc tests.

AGMA 925-A03 – Effect of Lubrification on Gear Surface Distress.pdf

The AGMA Aerospace Committee began investigating scuffing inand Lemanski [6] published results of a computer analysis that contains data for 90 spur and helical gearsets, and formed the terms for AGMA In addition, it added several improvements including:. The purpose of this information sheet is to provide the user with information pertinent to the lubrication of industrial metal gears for power transmission applications.

It is intended that this document serve as a general guideline and source of information about conventional lubricants, their properties, agmma their general tribological behavior in gear contacts. 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 agms 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.

Agmz 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 925-aa03 this time.

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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 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 standalone 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 standard will be welcome. AGMA A03 reaffirmed January SCOPE This information sheet is designed to provide currently available tribological information pertaining to oil lubrication of industrial gears for power transmission applications.

InKelley [4] changed his surface roughness term slightly. In addition, it added several improvements including: Helical gears were analyzed by resolving the load in the normal plane and distributing the normal load over the minimum length of the contact lines. The semi-width of the Hertzian contact band was calculated based on the normal relative radius of curvature; Derating factors for application, misalignment and dynamics were explicit input data; Options for coefficient of friction were part of input data, including a constant 0.

Quantity must be a positive whole number.