AGMA-901-A92.pdf
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1、AGHA 901-A 92 m Ob87575 00031110 7T5 m AGMA 901492 AMERICAN GEAR MANUFACTURERS ASSOCIATION A Rational Procedure for the Preliminary Design of Minimum Volume Gears AGMA INFORMATION SHEET (Thk Information Sheet i s NOT an AGMA Sraadard) Copyright American Gear Manufacturers Association Provided by IHS
2、 under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 04:52:50 MDTNo reproduction or networking permitted without license from IHS -,-,- AGMA 901-A 72 = Ob87575 0003L4L 831 AGMA 901-A92, A Rational Procedure for the Preliminary Design of Minimum Vol
3、ume Gears CAUTION NOTICE: AGMA standards 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 the Association on the subject matter. Tables or o
4、ther self-supporting sections may be quoted or extracted in their entirety. Credl lines should read Extracted from AGMA 901-A92, A Ratbnd Prvcedure forthe PreliminatyDesignofMinimum Volume Gem, with the permission o f the publisher, the American Gear Manufacturers Association, 1500 King Street, Suit
5、e 201 , Alexandria, Virginia 223141. ABSTRACT: A simple, closed-form procedure is presented as 8 first step in the design of minimum vdume spur and helical gearsets. The procedure includes methods for selecting geometry and dimensions, considering maximum pitting resistance, bending strength, and sc
6、uffing resistance. It also includes methods for selecting profile Shift. Copyright 9, 1992 by American Gear Manuiacturers Association Published by American Gear Manufacturers Association 1500 King Street, Suite 201, Alexandria, Vlrginla, 22314 ISBN: 1-55589-579-4 ii Copyright American Gear Manufactu
7、rers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 04:52:50 MDTNo reproduction or networking permitted without license from IHS -,-,- A G M A 90%-A 92 Ob87575 0003142 778 m Contents Page Foreword . v 1 Scope . 1 1.
8、1 Procedure 1 1.2 Exceptions . 1 2 Definitionandsymbols 1 2.1 Definitions . 1 2.2 Symbols . 1 3 Inputvariables 1 3.1 Materials and heat treatment . 1 3.2 Design life . 5 3.3 Aspectratio 5 3.4 Inputpower 6 3.5 Combined derating factors. Cd and IQ . 6 3.6 Geomettyfactors 8 3.7 Gearratio 8 3.8 Cutter p
9、rofile angle . 9 3.9 Toolselection . 10 3.1 O Selecting a helix angle . 10 3.11 Factorofsafety 10 4 Preferred number of pinion teeth . 11 5 Design algorithm . 13 7 Considerations for improved rating . 14 Improve scuffing resistance . 15 6 Designaudit . 14 7.1 Improve bending fatigue resistance . 14
10、7.2 Improve pitting fatigue resistance 15 7.3 7.4 Profileshfi . 15 7.5 Summary . 15 Tables 1 Symbols used in equations 2 2 Allowable contact stress number9 for steel gears . 4 3 Allowable bending stress numbers for steel gears . 5 4 5 Typical load distribution factors . 7 6 Effects of helix angle in
11、 parallel shat gearing . 11 Typical application factors, Ca and Ka 6 i iii Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 04:52:50 MDTNo reproduction or networking permitted wit
12、hout license from IHS -,-,- AGHA 901-A 92 Ob87575 0003343 b04 Contents (cont) Page Figures 1 2 3 4 5 Two branch double stage gearing . 6 Preferred number of pinion teeth . 11 Preferred number of pinion teeth for spur gear (unmodified) 12 Preferred number of pinion teeth for spur gear (modified) 13 P
13、referred number of pinion teeth for spur gear where redesign shouldbeconsidered 13 Annexes A Profileshift 17 B C E Ratio split for minimum volume 23 Ratio split for an existing two stage box 27 D Exampleproblems 31 References and bibliography 37 N Copyright American Gear Manufacturers Association Pr
14、ovided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 04:52:50 MDTNo reproduction or networking permitted without license from IHS -,-,- AGMA 901-A 92 Ob87575 0003344 540 FOREWORD The foreword, footnotes, and annexes are provided for in
15、formational purposes only and should not be const rued as a part of AG MA 90 1 -A92, A Rational Procedure for the Preliminary Design of Minimum Volume Gears, Gear design is a process of synthesis where gear geometry, materials, heat treatment, manufacturing methods, and lubrication are selected to m
16、eet the performance requirements of a given application. The designer must design the gearset with adequate pitting resistance, bending strength, and scuffing resistance to transmit the required power for the design life. With the algorithm presented here, one can select materials and heat treatment
17、 within the economic constraints and limitations of manufacturing facilities, and select the gear geometry tosatisfy constraints on weight, size and configuration. The gear designer can minimize noise level and operating temperature by minimizing the pitchline velocity and sliding velocity. This is
18、done by specifying high gear accuracy and selecting material strengths consistent with maximum material hardness, to obtain minimum volume gearsets with teeth no larger than necessary to balance the pitting resistance and bending strength. Gear design is not the same as gear analysis. Existing gears
19、ets can only be analyzed, not designed. While design is more challenging than analysis, current textbooks do not provide proceduresfor designing minimum volume gears. They usually recommend that the number of teeth in the pinion be chosen based solely on avoiding undercut. This information sheet, ba
20、sed on the workof R. Errichello 1*, will show why this practice, or any procedure which arbitrarily selects the number of pinion teeth, will not necessarily result in minimum volume gearsets. Although there have been many technical papers on gear design (for example 2 and 3 ) , most advocate using c
21、omputer-based search algorithms which are unnecessary. Tucker 4 came the closest to an efficient algoriithm, but he did not show how to find the preferred number of teeth for the pinion. This information sheet includes the design of spur and helical gears. Other gear types could bedesigned by a simi
22、lar algoriithm with some slight modifications to the one presented here. AGMA 901-A92 was approved by the Helical Gear Rating Committee in March, 1992 and approved by the AGMA Board of Directors as of May, 1992. Suggestions for the improvement of this information sheet will be welcome. They should b
23、e sent to the American Gear Manufacturers Association, 1500 King Street, Suite 201 , Alexandria, Virginia, 2231 4. * Numbers in brackets refer to the list of references in annex E. V Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111
24、111001, User=Wing, Bernie Not for Resale, 04/18/2007 04:52:50 MDTNo reproduction or networking permitted without license from IHS -,-,- AGHA 901-A 92 0687575 0003345 487 PERSONNEL of the AGMA Committee for Helical Gear Rating Chairman: D. McCarthy . Doms Company Vice Chairman: N. Hube . . General El
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