AGMA-913A-1998.pdf
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1、AGA42 913-A98 AMERICAN GEAR MANUFACTURERS ASSOCIATION Method for Specibing the Geometry of Spur and Helical Gears AGMA INFORIMATION SHEET (This Information Sheet is NOT an AGMA Standard) Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/
2、1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 09:48:25 MDTNo reproduction or networking permitted without license from IHS -,-,- American Gear Method for Specifying the Geometry of Spur and Helical Gears AGMA 91 3-A98 Manufacturers CAUTION NOTICE: AGMA technical publications are subject t
3、o constant improvement, revision, or withdrawal as dictated by experience. Any person who refers to any AGMA Association Technical Publication should be sure that the publication is the latest available from the Association on the subject matter. Fables or other self-supporting sections may be quote
4、d or extracted. Credit lines should read: Extracted from AGMA 91 3-A98, Method for Spec/fyhg the Geomev of Spur and Helical Gears, with the permission of the publisher, the American Gear Manufacturers As- sociation, 1500 King Street, Suite 201, Alexandria, Wrginia 2231 4.1 Approved March 13, 1998 AB
5、STRACT This information sheet provides information to translate tooth thickness specifications which are expressed in terms of tooth thickness, center distance or diameter into profile shift coefficients, as that term is used in international standards. Published by American Gear Manufacturers Assoc
6、iation 1500 King Street, Suite 201, Alexandria, Virginia 22314 Copyright O 1998 by American Gear Manufacturers Association All rights reserved. No pari of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher
7、. Printed in the United States of America ISBN: 1-55589-714-2 ii 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 09:48:25 MDTNo reproduction or networking permitted without licen
8、se from IHS -,-,- AMERICAN GEAR MANUFACTURERS ASSOCIATION . AGMA 913-A98 Contents Page Foreword . iv 1 Scope 1 2 Terrnsand symbols . 1 3 Definitions . 3 4 Profileshift 6 5 Internal gear pair calculations . 11 Tables 1 2 Obsoleteterms 3 Symbols used in equations 1 Figures 1 The basicrack . 3 2 Hypoth
9、eticaltool . 4 Profile shift o f a helical gear 5 3 4 Effect of profile shift on involute tooth profiles . 7 5 Distances along the line of action . 9 6 Root radii cut with rack tool . 10 7 Distances along the line of action for an internal gear pair . 12 Annexes A Tool proportions . 15 B Calculation
10、 of profile shift . 19 Bibliography . 25 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 09:48:25 MDTNo reproduction or networking permitted without license from IHS -,-,- AG
11、MA 913-A90 AMERICAN GEAR MANUFACTURERS ASSOCIATION Foreword vhe foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of AGMA Information Sheet 91 3498, Method for Speafyhg the Geometry of Spur and Helical Gears.
12、This information sheet is intended to provide sufficient information to allow its users to be able to translate tooth thickness specifications which are expressed in terms of tooth thickness, center distance or diameter into profile shift coefficients, as that term is used in international standards
13、. This AGMA information sheet and related publications are based on typical or average data, conditions or application. AGMA 913-A98 was approved by the AGMA membership on March 13, 1998. Suggestions for improvement of this standard will be welcome. They should be sent to the American Gear Manufactu
14、rers Association, 1500 King Street, Suite 201 , Alexandria, Virginia 2231 4. iv 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 09:48:25 MDTNo reproduction or networking permitte
15、d without license from IHS -,-,- AMERICAN GEAR MANUFACTURERS ASSOCIATION AGMA 913-A98 PERSONNEL of the AGMA Nomenclature Committee Chairman: John R. Colbourne . University of Alberta Vice Chairman: D. McCarroll . Gleason Works ACTIVE MEMBERS W.A. Bradley III Consultant R.L. Errichello GEARTECH D. Go
16、nnella Texaco Lubricants Company D.R. McVittie . Gear Engineers, Inc. O.A. LaBath . Cincinnati Gear Company I. Laskin . Irving Lackin, P.E. G.W. Nagorny Nagorny a , , , , is the operating transverse pressure angle; a, is the reference transverse pressure angle. 3.10 Addendum values The gear addendum
17、, measured from the reference cylinder, is usually chosen as (hap +y). This value depends on the profile shift rather than the rackshift and is therefore independent of the value chosen for backlash. In certain designs, particularly when the center distance is significantly larger than the reference
18、 standard center distance, the gear ad- dendum may need to be reduced to allow adequate clearance at the roots of the meshing gear, see 4.10. For internal gear pair equations which replace equations 7 through 9, see 5.1. 4 Profileshift 4.1 Profile shift calculation Profile shift is selected consider
19、ing the following criteria: - avoiding undercut; - avoiding narrow top lands; - balanced specific sliding; - balanced flash temperature; - balanced bending fatigue life. The profile shift should be large enough to avoid undercut and small enough to avoid narrow top lands. The profile shifts required
20、 for balanced specific sliding, balanced flash temperature and balanced bending fatigue life are usually different. Therefore, the value used should be based on the criterion that is judged to be the most important for the particular application. Figure 4 illustrates how the shape of a gear tooth is
21、 influenced by the number of teeth on the gear and the value of the profile shift coefficient. The influence that the number of teeth has on tooth form can be seen by viewing the teeth within any given column of figure 4. With small numbers of teeth, the tooth has larger curvature and the relative t
22、hickness of the teeth at the topland and at the form diameter is smaller. As the number of teeth increases, the topland and tooth thicknesses in- crease and the curvature of the profiles decrease. Tooth thicknesses are maximum for a rack with straight-sided profiles and theoretically infinite number
23、 of teeth. Viewing figure 4 horizontally within any given row shows how profile shift changes tooth form. Row near the top of figure 4 show that gears with few teeth have atooth form that depends strongly on the value of the profile shift coefficient. For gears with few teeth, the sensitivity to pro
24、file shift narrows the choice for profile shift coefficient because too little profile shift results in undercut teeth, whereas too much profile shift gives teeth with toplands that are too narrow. For example, the acceptable values of profile shift coefficient for a 12 tooth gear range from x = 0.4
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