Fundamental Rating Factors and Calculation …

1 ANSI/AGMA 2001-D04 ANSI/AGMA 2001-D04(Revision ofANSI/AGMA 2001--C95)AMERICAN NATIONAL STANDARDF undamental Rating Factors andCalculation Methods for Involute Spur andHelical gear TeethCopyright American gear Manufacturers Association Provided by IHS under license with AGMAL icensee=Electric Boat/9993263100 Not for Resale, 06/07/2005 06:58:52 MDTNo reproduction or networking permitted without license from IHS--`,```,,,``,``,`,`,`,``,````,,-`-`,, `,,`,`,,`---iiFundamental RatingFactorsandCalculationMethodsforInv oluteSpurandHelical gear TeethANSI/AGMA 2001--D04[Revision of ANSI/AGMA 2001--C95]Approval of an American National Standard requires verification by ANSI that the require-ments for due process, consensus, and other criteria for approval have been met by thestandards is established when, in the judgment of the ANSI Board of Standards Review,substantial agreement has been reached by directly and materially affected agreement means much more than a simple majority, but not necessarily una-nimity.

2 Consensus requires that all views and objections be considered, and that aconcerted effort be made toward their use of American National Standards is completely voluntary; their existence does notin any respect preclude anyone, whether he has approved the standards or not, frommanufacturing, marketing, purchasing, or using products, processes, or procedures notconforming to the American National Standards Institute does not develop standards and will in nocircumstances give an interpretation of any American National Standard. Moreover, noperson shall have the right or authority to issue an interpretation of an American NationalStandard in the name of the American National Standards Institute.

3 Requests for interpre-tation of this standard should be addressed to the American gear NOTICE: AGMA technical publications are subject to constant improvement,revision, or withdrawal as dictated by experience. Any person who refers to any AGMA technical publication should be sure that the publication is the latest available from theAssociation on the subject matter.[Tables or other self--supporting sections may be referenced. Citations should read: SeeANSI/AGMA 2001--D04, Fundamental Rating Factors and Calculation Methods for Invo-lute Spur and Helical gear Teeth,published by the American gear Manufacturers Asso-ciation, 500 Montgomery Street, Suite 350, Alexandria, Virginia 22314, ]Approved December 28, 2004 ABSTRACTThis standard specifies a method for Rating the pitting resistance and bending strength of spur and helical invo-lute gear pairs.

4 A detailed discussion of Factors influencing gear survival and Calculation methods are byAmerican gear Manufacturers Association500 Montgomery Street, Suite 350, Alexandria, Virginia 22314 Copyright 2004 by American gear Manufacturers AssociationAll rights part of this publication may be reproduced in any form, in an electronicretrieval system or otherwise, without prior written permission of the in the United States of AmericaISBN: 1--55589--839--4 AmericanNationalStandardCopyright American gear Manufacturers Association Provided by IHS under license with AGMAL icensee=Electric Boat/9993263100 Not for Resale, 06/07/2005 06:58:52 MDTNo reproduction or networking permitted without license from IHS--`,```,,,``,``,`,`,`,``,````,,-`-`,, `,,`,`,,`---ANSI/AGMA 2001--D04 AMERICAN NATIONAL STANDARDiii AGMA 2004 ---- All rights Normative references, definitions and Criteria for tooth Fundamental Rating Geometry Factors , Transmitted tangential load, Dynamic factor, Overload factor, Service Safety Factors , Elastic coefficient, Surface condition factor, Hardness ratio factor, Load distribution factor, Allowable stress numbers, Stress cycle Factors , Reliability factor, Temperature factor, Size factor.

5 Method for determination of dynamic factor with AGMA Rim thickness factor, Application Discussion of the analytical face or longitudinal load distribution gear material fatigue Controlling section size considerations for through hardened Dynamic factor, Hardness ratio factor,CH(through hardened) Hardness ratio factor,CH(surface hardened pinions) Instantaneous contact lines in the plane of Pinion proportion factor, Evaluation Mesh alignment factor, Allowable contact stress number for through hardened steel gears, Allowable bending stress number for through hardened steel gears, Allowable bending stress numbers for nitrided through hardened steel gears( , AISI 4140, AISI 4340)

6 , Allowable bending stress numbers for nitriding steel gears, Variations in hardening pattern obtainable on gear teeth with flame orinduction Minimum effective case depth for carburized gears, Core hardness coefficient, Minimum total case depth for nitrided gears, Allowable yield strength number for steel gears, American gear Manufacturers Association Provided by IHS under license with AGMAL icensee=Electric Boat/9993263100 Not for Resale, 06/07/2005 06:58:52 MDTNo reproduction or networking permitted without license from IHS--`,```,,,``,``,`,`,`,``,````,,-`-`,, `,,`,`,,`---ANSI/AGMA 2001--D04 AMERICAN NATIONAL STANDARDiv AGMA 2004 ---- All rights reserved17 Pitting resistance stress cycle factor, Bending strength stress cycle factor, Symbols used in gear Rating Empirical constants.

7 A, B, and Allowable contact stress number,sac, for steel Allowable bending stress number,sat, for steel Allowable contact stress number,sac, for iron and bronze Allowable bending stress number,sat, for iron and bronze Major metallurgical Factors affecting the allowable contact stress number,sac, and allowable bending stress number,sat, of through hardened Major metallurgical Factors affecting the allowable contact stress number,sac, and allowable bending stress number,sat, of flame or induction hardenedsteel Major metallurgical Factors affecting the allowable contact stress number,sac, and allowable bending stress number,sat, of carburized and hardenedsteel Major metallurgical Factors affecting the allowable contact stress number,sac, and allowable bending stress number,sat, of nitrided steel Reliability Factors , American gear Manufacturers Association Provided by IHS under license with AGMAL icensee=Electric Boat/9993263100 Not for Resale, 06/07/2005 06:58.

8 52 MDTNo reproduction or networking permitted without license from IHS--`,```,,,``,``,`,`,`,``,````,,-`-`,, `,,`,`,,`---ANSI/AGMA 2001--D04 AMERICAN NATIONAL STANDARDv AGMA 2004 ---- All rights reservedForeword[The foreword, footnotes and annexes, if any, in this document are provided forinformational purposes only and are not to be construed as a part of ANSI/AGMA2001--D04, Fundamental Rating Factors and Calculation Methods for Involute Spur andHelical gear Teeth.]This standard presents general formulas for Rating the pitting resistance and bendingstrength of spur and helical involute gear teeth, and supersedes ANSI/AGMA purpose of this standard is to establish a common base for Rating various types of gearsfor differing applications, and to encourage the maximum practical degree of uniformity andconsistency between Rating practices within the gear industry.

9 It provides the basis fromwhich more detailed AGMA application standards are developed, and provides a basis forcalculation of approximate ratings in the absence of such formulas presented in this standard contain Factors whose values vary significantlydepending on application, system effects, gear accuracy, manufacturing practice, anddefinition of gear failure. Proper evaluation of these Factors is essential for realistic standard is intended for use by the experienced gear designer capable of selectingreasonable values for Rating Factors and aware of the performance of similar designsthrough test results or operating AGMA the values for Life Factor,CLandKL, Dynamic Factor,CvandKv, and LoadDistribution Factor,CmandKm, were revised.

10 Values for Factors assigned in standards priorto that were not applicable to nor were the values assigned in applicable toprevious detailed information on the Geometry Factors ,IandJ, were removed from ANSI/AGMA2001--B88, the revision of AGMA This material was amplified and moved to AGMA908--B89,Geometry Factors for Determining the Pitting Resistance and Bending Strengthfor Spur, Helical and Herringbone gear values ofIandJhave not been changedfrom previous ANSI/AGMA 2001--B88 the Allowable Stress Number section was quality Factors for steel materials were defined, establishing minimum qualitycontrol requirements and allowable stress numbers for various steel quality higher allowable stress numbers for carburized gears were added when madewith high quality steel.