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AGMA 13FTM08:2013 Edition

AGMA 13FTM08:2013 Edition

$14.30

Application and Improvement of Face Load Factor Determination Based on AGMA 927 (Accurate and Fast Algorithm for Load Distribution Calculation, for Gear Pair and Planetary Systems, Including Duty Cycle Analysis)

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AGMA 2013 19
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The face load factor KHß, which in rating equations represents the load distribution over the common face width in meshing gears, is one of the most important items for a gear strength calculation. In the international standard for cylindrical gear rating, the ISO 6336-1, using method C, some formulas are proposed to get a value for this factor. But as the formulas are simplified, the result is often not very realistic. Also AGMA 2001 (or AGMA 2101) proposes a formula for KHß, different from ISO 6336, but again not always appropriate. Therefore a note in AGMA stipulates, that "it may be desirable to use an analytical approach to determine the load distribution factor".

In the last edition of ISO 6336 (2006), a new annex E was added: "Analytical determination of load distribution". This annex is entirely based on AGMA 927-A01. It is a well-documented procedure to get a direct and precise number for the face load factor. Today an increasing number of gear designers are using tooth contact analysis (TCA) methods to get precise information over the load distribution on the full gear flank. Contact analysis is very time consuming and does not permit to get a value for KHß, as defined by the ISO or AGMA standard. A contact analysis result combines different factors of ISO 6336 as KHß, KHa, Ze Zß, ZB, ZD and buttressing effects, etc., thus to `extract' KHß from a TCA is not possible.

The use of the algorithm, as proposed by AGMA 927, is a good solution to get proper values for KHß

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