ISO-6336-3-2006.pdf
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1、 Reference number ISO 6336-3:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 6336-3 Second edition 2006-09-01 Calculation of load capacity of spur and helical gears Part 3: Calculation of tooth bending strength Calcul de la capacit de charge des engrenages cylindriques dentures droite et hlicodale Parti
2、e 3: Calcul de la rsistance la flexion en pied de dent ISO 6336-3:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and in
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5、, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in w
6、riting from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved ISO 63
7、36-3:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword. v Introduction. vi 1 Scope . 1 2 Normative references. 1 3 Terms, definitions, symbols and abbreviated terms. 1 4 Tooth breakage and safety factors. 2 5 Basic formulae 2 5.1 Safety factor for bending strength (safety against tooth
8、 breakage), SF 2 5.2 Tooth root stress, F 2 5.3 Permissible bending stress, FP. 4 6 Form factor, YF 8 6.1 General. 8 6.2 Calculation of the form factor, YF: Method B. 9 6.3 Derivations of determinant normal tooth load for spur gears . 13 7 Stress correction factor, YS. 14 7.1 Basic uses . 14 7.2 Str
9、ess correction factor, YS: Method B. 14 7.3 Stress correction factor for gears with notches in fillets. 15 7.4 Stress correction factor, YST, relevant to the dimensions of the standard reference test gears. 15 8 Helix angle factor, Y 15 8.1 Graphical value. 16 8.2 Determination by calculation. 16 9
10、Rim thickness factor, YB. 16 9.1 Graphical values. 16 9.2 Determination by calculation. 17 10 Deep tooth factor, YDT 18 10.1 Graphical values. 18 10.2 Determination by calculation. 18 11 Reference stress for bending 19 11.1 Reference stress for Method A 19 11.2 Reference stress, with values F lim an
11、d FE for Method B 19 12 Life factor, YNT. 19 12.1 Life factor, YNT: Method A 19 12.2 Life factor, YNT: Method B 19 13 Sensitivity factor, YT, and relative notch sensitivity factor, Y rel T. 21 13.1 Basic uses . 21 13.2 Determination of the sensitivity factors. 21 13.3 Relative notch sensitivity fact
12、or, Y rel T: Method B. 22 14 Surface factors, YR, YRT, and relative surface factor, YR rel T 27 14.1 Influence of surface condition. 27 ISO 6336-3:2006(E) iv ISO 2006 All rights reserved 14.2 Determination of surface factors and relative surface factors.28 14.3 Relative surface factor, YR rel T: Met
13、hod B28 15 Size factor, YX30 15.1 Size factor, YX: Method A .30 15.2 Size factor, YX: Method B .30 Annex A (normative) Permissible bending stress, FP, obtained from notched, flat or plain polished test pieces33 Annex B (informative) Guide values for mean stress influence factor, YM.40 Bibliography .
14、42 -,-,- ISO 6336-3:2006(E) ISO 2006 All rights reserved v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committ
15、ees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Int
16、ernational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International
17、Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the s
18、ubject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6336-3 was prepared by Technical Committee ISO/TC 60, Gears, Subcommittee SC 2, Gear capacity calculation. This second edition cancels and replaces the first edition (ISO 6336-3:1996), Claus
19、es 5 and Clause 9 of which have been technically revised, with a new Clause 8 having been added to this new edition. It also incorporates the Technical Corrigendum ISO 6336-3:1996/Cor.1:1999. ISO 6336 consists of the following parts, under the general title Calculation of load capacity of spur and h
20、elical gears: Part 1: Basic principles, introduction and general influence factors Part 2: Calculation of surface durability (pitting) Part 3: Calculation of tooth bending strength Part 5: Strength and quality of materials Part 6: Calculation of service life under variable load -,-,- ISO 6336-3:2006
21、(E) vi ISO 2006 All rights reserved Introduction The maximum tensile stress at the tooth root (in the direction of the tooth height), which may not exceed the permissible bending stress for the material, is the basis for rating the bending strength of gear teeth. The stress occurs in the “tension fi
22、llets” of the working tooth flanks. If load-induced cracks are formed, the first of these often appears in the fillets where the compressive stress is generated, i.e. in the “compression fillets”, which are those of the non-working flanks. When the tooth loading is unidirectional and the teeth are o
23、f conventional shape, these cracks seldom propagate to failure. Crack propagation ending in failure is most likely to stem from cracks initiated in tension fillets. The endurable tooth loading of teeth subjected to a reversal of loading during each revolution, such as “idler gears”, is less than the
24、 endurable unidirectional loading. The full range of stress in such circumstances is more than twice the tensile stress occurring in the root fillets of the loaded flanks. This is taken into consideration when determing permissible stresses (see ISO 6336-5). When gear rims are thin and tooth spaces
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