AGMA INFORMATION SHEET (This Information Sheet is NOT an AGMA Standard). Effect of Lubrication on Gear Surface Distress American AGMA A AGMA A Effect of Lubrication on Gear Surface Distress. standard by American Gear Manufacturers Association,. View all product details. Most Recent . AGMA A03 Effect of Lubrication on Gear Surface Distress calculates the conditions in the lubrication gap across the gear meshing. AGMA defines how.
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Accumulation of feedback data will serve to enhance future developments and improved methods to evaluate lubricant related surface distress. 9225-a03 has been introduced as an aid to agma 925-a03 gear manufacturing and user community. In Harmon Blok published his theory about agma 925-a03 relationship between contact temperature and scuffing. Blok  published agmaa contact temperature equation in 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.
However, defining the permitted scuffing agma 925-a03 according to AGMA presents more of a problem, because of the lack of comprehensive or generally applicable information. It is agma 925-a03 to serve as a general guideline and source of information about gear oils, their properties, and their general tribological behavior in gear contacts. 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.
Each of these forms of surface distress may be influenced by the lubricant; the calculations are offered to help assess the agma 925-a03 risk involved with 952-a03 given lubricant choice.
Specifically, the subcommittee targeted the effect lubrication may agma 925-a03 on gear surface distress. The probability of the occurrence of scuffing is also determined in accordance with AGMA This should be considered a work in progress as more is learned agma 925-a03 the theories and understanding of the various parameters and how they affect the life of the gear.
You can therefore use this calculation method to optimize gear toothing for micropitting frosting.
Manufacturers and end-users are encouraged, however, to work agma 925-a03 their lubricant suppliers to address specific concerns or special issues that may not be covered here such as greases. It is known, however, from literature and research results agna there is a direct correlation between the minimum lubrication gap size and the occurrence of micropitting. AGMA A03 reaffirmed January SCOPE This information sheet is agma 925-a03 to provide currently available tribological information pertaining to oil lubrication of industrial gears for power transmission applications.
AGMA also includes a definition of the probability of scuffing. In particular there is no reference to the scuffing load load capacity specification agma 925-a03 to the FZG test. InKelley  changed his surface roughness term slightly.
Surface distress may be scuffing adhesive wearfatigue agma 925-a03 and macropittingor excessive abrasive wear scoring. The probability of wear calculated by the standard is greater than the values that occur in practice.
As agma 925-a03 in AGMAyou can use this input window to define the probability of scuffing and wear as well as susceptibility to micropitting frosting.
Flow charts are included as aids to using the equations. One of the key agma 925-a03 is the estimated film thickness.
14 AGMA – Scoring
As discussions evolved, it became clear that this should be a standalone document which will hopefully serve many other gear types. The calculation method can therefore be used when agma 925-a03 is to be optimized to resist micropitting. The standard does not give any agma 925-a03 about safety against micropitting frosting. On this basis, the standard calculates the probability of wear by means of metallic contact by the surfaces if the lubrication gap is too small.
This is not a trivial calculation, but one that has significant impact on overall agma 925-a03 of the gear pair. The report shows the results for both methods. Oils with active EP additives therefore have a tendency to be undervalued.
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. Quantity must be a agma 925-a03 whole number. The Blok flash temperature theory began to receive serious consideration as a predictor of scuffing in gears. AGMA describes the calculation of the height of the lubrication gap taking into account the curvature of the flanks, properties of the lubricant, sliding speed and the local stress load. Kelley found it necessary to couple the coefficient of friction to surface agma 925-a03 of the gear teeth.
In addition, it added several improvements including: There is therefore a tendency to underevaluate oils that have effective EP additives. The wear is caused by the metal surfaces contacting each other if the lubrication gap is too narrow. The determination of the permitted scuffing temperature under AGMA agma 925-a03 somewhat problematic because comprehensive or generally applicable notes are missing in this area.
However, data provided by the relevant technical literature, and the results of research, reveal that there agma 925-a03 a direct correlation between the minimum lubrication gap-to-surface roughness ratio and the occurrence of micropitting frosting.
This went largely unnoticed in the U. The information would also provide the user with more tools to agma 925-a03 make a more informed decision about the performance of a geared agma 925-a03.
Item Detail – AGMA A03 (reaffirmed January )
It went relatively unnoticed in the U. It was clear from the work initiated on the agma 925-a03 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 agma 925-a03 standards.
This analysis uses the same base 9225-a03 Blok’s equations as the calculation of scuffing according to the flash temperature criteria given in DINPart 4. It zgma considered in performance issues such as scuffing, wear, and surface fatigue.
These two parameters are considered critical in defining areas of operation that may lead to unwanted surface distress. In addition, it added several improvements including:. This information sheet provides sufficient agms 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.
AGMA defines how to calculate the lubrication gap height while taking agma 925-a03 account the flank deformation, lubricant properties, sliding velocity, and local Hertzian stress.
The equations provided herein allow the user to calculate specific oil film thickness and instantaneous contact flash temperature for gears in agma 925-a03.
The AGMA Aerospace Committee began investigating scuffing in agma 925-a03, and Lemanski  aagma results of a computer analysis that contains data for 90 spur and helical gearsets, and formed agma 925-a03 terms for AGMA The purpose of agma 925-a03 information sheet is to provide the user with information pertinent to the lubrication of industrial metal gears for power transmission applications.