1、Inverted Tooth (Silent) Chains and SprocketsAN AMERICAN NATIONAL STANDARDASME B29.2M-2007Revision of ANSI B29.2M-1982 (R2004)Intentionally left blank ASME B29.2M-2007Revision of ANSI B29.2M-1982 (R2004)Inverted Tooth(Silent) Chainsand SprocketsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,
2、 NY 10016Date of Issuance: June 25, 2007This Standard will be revised when the Society approves the issuance of a new edition. There willbe no addenda or written interpretations of the requirements of this Standard issued to this edition.Periodically certain actions of the ASME B29 Committee may be
3、published as Cases. Cases arepublished on the ASME Web site under the Committee Pages at http:/cstools.asme.org as they areissued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria f
4、or American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides
5、an opportunity for additional public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asse
6、rted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expresslyadvised that determination of the vali
7、dity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts
8、 responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,
9、without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the
10、B29 Committee vi1 Silent Chains 12 Sprockets . 1Figures1 Silent Chain 32 Typical Links . 33 Link Form 34 Chain Widths and Sprocket Profiles for38in. Pitch and Larger . 55 Chain Widths and Sprocket Profiles for316in. Pitch . 106 Sprocket Tooth Form for38in. Pitch and Larger . 127 Sprocket Tooth Form
11、for316in. Pitch 138 Sprocket Diameters for38in. Pitch and Larger . 149 Sprocket Diameters for316in. Pitch . 14Tables1 Chain Link Data, in. 42 Chain Link Data, mm . 43 Chain Widths and Sprocket Face Dimensionsfor38in. Pitch and Larger, in. 64 Chain Widths and Sprocket Face Dimensionsfor38in. Pitch an
12、d Larger, mm . 85 Chain Widths and Sprocket Face Dimensionsfor316in. Pitch, in. . 116 Chain Widths and Sprocket Face Dimensionsfor316in. Pitch, mm 117 Over Pin Diameter Tolerances for38in. Pitch and Larger, in. . 158 Over Pin Diameter Tolerances for38in. Pitch and Larger, mm . 159 Over Pin Diameter
13、Tolerances for316in. Pitch, in. . 1510 Over Pin Diameter Tolerances for316in. Pitch, mm 1611 Maximum Hub Diameter for Sprocket of Unity Pitch 1612 Sprocket Dimensions for Unity Pitch, in. 1713 Sprocket Dimensions for316in. Pitch, in. 2014 Sprocket Dimensions for316in. Pitch, mm . 22Nonmandatory Appe
14、ndixA Supplementary Information . 25iiiFOREWORDPreparatory work during the late 1930s and early 1940s by the Silent Chain Division of theAssociationof RollerandSilent ChainManufacturers(ARSCM, nowtheAmerican ChainAssocia-tion) resulted in agreement on standardization of silent chain primarily on the
15、 basis of standard-ized sprocket tooth design. Since individual chain manufacturers employed various chain jointdesigns,itwasagreedthatstandardsonchaindetailwouldbelimitedtoensureinterchangeabilityof chains on sprockets of any number of teeth. At a meeting of representatives of all majorAmerican sil
16、ent chain manufacturers in September 1944, under the auspices of the ARSCM,recommended “Engineering Standards for Industrial Silent Chain and Sprockets” were agreedupon.Formulasforsprocketdesignwereexpandedintotables,whichwereapprovedandadoptedby the ARSCM in April 1945. Supplementary information on
17、 sprocket tooth cutters was added,andallofthedatawereincorporatedinacomprehensivereport,IndustrialStandardsforIndustrialSilent Chains, Sprockets, and Cutters. This report, with further refinements by minor revisionsin 1949 and 1950, was then submitted to the Sectional Committee for review and approv
18、al as anAmerican Standard.The Sectional Committee accepted the recommendations with some minor revisions in 1950and referred it to ASME and The Society of Automotive Engineers (SAE) for their approval assponsors of the Committee, with subsequent transmission to the American Standards Association(ASA
19、) for final acceptance as an American Standard. After approval by ASME and SAE, it wasaccepted by ASA on November 9, 1950 as American Standard B29.2.In 1956, the Sectional Committee authorized a revision to the standard to bring it up to date.The revised standard was approved by the American Standar
20、ds Association on July 11, 1957.This revision was in use for many years and was reaffirmed by ANSI on January 4, 1971. (ASAbecame ANSI in 1969.)In 1945, the formulation of a recommended standard for “small pitch” silent chain (pitch sizeslessthan38in.)andsprockettoothformbecameamatterofconsideration
21、byARSCMsSilentChainDivision.Asinthecaseofthelargerchainseries,theobjectivewastoprovideinterchangeabilityofchains on sprockets and the development of recommended practices for power transmissionratings and selection procedure. After a number of years of usage as an ARSCM IndustrialStandard, the recom
22、mendations became American Standard B29.9 in 1958. Although it wasoriginally anticipated that there might be a need for two or three pitch sizes of the miniaturesilent chains, only one, the316in. size, has been developed. The information that has heretoforebeen published as B29.9 was incorporated in
23、 the basic Silent Chain Standard, B29.2, as part ofthe 1982 revision.In 2006, the B29 Committee undertook a review of the B29.2M Standard and adjusted thecontents consistent with developments in industry since the standard had been most recentlyrevised. The list of chain widths was modified to elimi
24、nate the 114in. pitch and some uncommonchain sizes. The illustrations of the side guide silent chain and center guide silent chains wererevised; tables of service factors and horsepower rating per inch of chain width were revised,with the 114in. pitch deleted in the latter listing; and the errata sh
25、eet of the previous revisionwas corrected in the formula for G (max.).This Standard was approved by ANSI on February 12, 2007.ivASME B29 COMMITTEEChains, Attachments, and Sprocketsfor Power Transmission and Conveying(The following is the roster of the Committee at the time of approval of this Standa
26、rd.)STANDARDS COMMITTEE OFFICERSC. G. Springman, ChairG. Osolsobe, SecretarySTANDARDS COMMITTEE PERSONNELW. C. Hall, Ramsey Products Corp.G. Osolsobe, The American Society of Mechanical EngineersE. Pawlicki, Drives, Inc.J. R. Wilbur, Alternate, Drives, Inc.V. D. Petershack, ConsultantD. W. Egbert, A
27、lternate, Hitachi Maxco Ltd.R. A. Reinfried, Conveyor Equipment Manufacturers AssociationS. Rhoad, Webster Industries, Inc.K. J. Smith, Ken Smith 0.050 H11547 pitch, in.(b) Tolerance for outside diameters of sprockets with rounded top teeth is the same as over pin diameter tolerance.(c) Tolerance fo
28、r guide groove diameter G p +0.000; 0.030 in. (0.76 mm).(d) Tolerance for maximum eccentricity (total indicator reading) pitch diameter with respect to bore p 0.001 H11547 PD, in., but not less than0.006 nor more than 0.032.(e) All tolerances are negative. Tolerance p (0.004 + 0.001PH20906N ) in., w
29、here P p chain pitch, N p number of teeth.Table 8 Over Pin Diameter Tolerances for38in. Pitch and Larger, mmNumber of TeethPitch Up to 15 1624 2535 3648 4963 6480 8199 100120 121143 144 Up9.52 0.13 0.13 0.13 0.15 0.15 0.18 0.18 0.18 0.20 0.2012.70 0.13 0.15 0.15 0.18 0.18 0.20 0.20 0.23 0.23 0.2515.
30、88 0.15 0.15 0.18 0.20 0.23 0.25 0.25 0.25 0.28 0.3019.05 0.15 0.18 0.20 0.23 0.25 0.28 0.28 0.30 0.33 0.3625.40 0.18 0.20 0.23 0.25 0.28 0.30 0.33 0.36 0.38 0.4031.75 0.20 0.23 0.25 0.28 0.33 0.36 0.38 0.43 0.46 0.4838.10 0.20 0.25 0.28 0.33 0.36 0.40 0.43 0.48 0.51 0.5650.80 0.25 0.30 0.36 0.40 0.
31、46 0.51 0.56 0.61 0.66 0.71GENERAL NOTES:(a) Tolerance for outside diameters of sprockets with square top teeth p +0.000; 0.050 H11547 pitch, in.(b) Tolerance for outside diameters of sprockets with rounded top teeth is the same as over pin diameter tolerance.(c) Tolerance for guide groove diameter
32、G p +0.000; 0.030 in. (0.76 mm).(d) Tolerance for maximum eccentricity (total indicator reading) pitch diameter with respect to bore p 0.001 H11547 PD, in., but not less than0.006 nor more than 0.032.(e) All tolerances are negative. Tolerance p (0.004 + 0.001PH20906N ) in., where P p chain pitch, N
33、p number of teeth.Table 9 Over Pin Diameter Tolerances for316in. Pitch, in.Number of TeethPitch Up to 15 1624 2535 3648 4963 6480 8199 100120 121143 144 Up0.1875 0.004 0.004 0.004 0.004 0.004 0.005 0.005 0.005 0.005 0.005GENERAL NOTES:(a) Tolerance for guide groove diameter G p +0.000 in.; 0.015 in.
34、 (0.38 mm).(b) Tolerance for maximum eccentricity (total indicator reading) pitch diameter with respect to bore is 0.004 in., up to and including 4 in.diameter, and 0.008 in., over 4 in. diameter.(c) All tolerances are negative.15ASME B29.2M-2007Table 10 Over Pin Diameter Tolerances for316in. Pitch,
35、 mmNumber of TeethPitch Up to 15 1624 2535 3648 4963 6480 8199 100120 121143 144 Up4.76 0.10 0.10 0.10 0.10 0.10 0.13 0.13 0.13 0.13 0.13GENERAL NOTES:(a) Tolerance for guide groove diameter G p +0.000 in.; 0.015 in. (0.38 mm).(b) Tolerance for maximum eccentricity (total indicator reading) pitch di
36、ameter with respect to bore is 0.004 in., up to and including 4 in.diameter, and 0.008 in., over 4 in. diameter.(c) All tolerances are negative.Table 11 Maximum Hub Diameterfor Sprocket of Unity PitchNumber of Teeth Hob Cut Straddle Cut17 4.019 4.09918 4.341 4.42119 4.662 4.74220 4.983 5.06321 5.304
37、 5.38422 5.626 5.70623 5.946 6.02624 6.265 6.34525 6.586 6.66626 6.905 6.98527 7.226 7.30628 7.546 7.62629 7.865 7.94530 8.185 8.26531 8.503 8.583GENERAL NOTES:(a) Equations for calculating maximum hub diameters (MHD):MHD (hobbed teeth)p PH20898cot180 degN 1.33H20899MHD (straddle cut teeth)p PH20898
38、cot180 degN 1.25H20899MHD for other methods of cutting teeth may differ from the above.(b) Good practice indicates that teeth of sprockets up to andincluding 31 teeth should have a minimum Rockwell hardnessof C50.16ASME B29.2M-2007Table 12 Sprocket Dimensions for Unity Pitch, in.Outside DiameterSqua
39、re G Max. GuidePitch Rounded Teeth Over Pin Diam. Groove Diam. Gage PinNumber of Teeth Diameter Teeth Note (1) Note (1) Note (1) Diameter17 5.442 5.429 5.298 5.669 4.189 0.625018 5.759 5.751 5.623 6.018 4.511 0.625019 6.076 6.072 5.947 6.324 4.832 0.625020 6.393 6.393 6.271 6.669 5.153 0.625021 6.71
40、0 6.714 6.595 6.974 5.474 0.625022 7.027 7.036 6.919 7.315 5.796 0.625023 7.344 7.356 7.243 7.621 6.116 0.625024 7.661 7.675 7.568 7.960 6.435 0.625025 7.979 7.996 7.890 8.266 6.756 0.625026 8.296 8.315 8.213 8.602 7.075 0.625027 8.614 8.636 8.536 8.909 7.396 0.625028 8.932 8.956 8.859 9.244 7.716 0
41、.625029 9.249 9.275 9.181 9.551 8.035 0.625030 9.567 9.595 9.504 9.884 8.355 0.625031 9.885 9.913 9.828 10.192 8.673 0.625032 10.202 10.233 10.150 10.524 8.993 0.625033 10.520 10.553 10.471 10.833 9.313 0.625034 10.838 10.872 10.793 11.164 9.632 0.625035 11.156 11.191 11.115 11.472 9.951 0.625036 11
42、.474 11.510 11.437 11.803 10.270 0.625037 11.792 11.829 11.757 12.112 10.589 0.625038 12.110 12.149 12.077 12.442 10.909 0.625039 12.428 12.468 12.397 12.751 11.228 0.625040 12.746 12.787 12.717 13.080 11.547 0.625041 13.064 13.106 13.037 13.390 11.866 0.625042 13.382 13.425 13.357 13.718 12.185 0.6
43、25043 13.700 13.743 13.677 14.028 12.503 0.625044 14.018 14.062 13.997 14.356 12.822 0.625045 14.336 14.381 14.317 14.667 13.141 0.625046 14.654 14.700 14.637 14.994 13.460 0.625047 14.972 15.018 14.957 15.305 13.778 0.625048 15.290 15.337 15.277 15.632 14.097 0.625049 15.608 15.656 15.597 15.943 14
44、.416 0.625050 15.926 15.975 15.917 16.270 14.735 0.625051 16.244 16.293 16.236 16.581 15.053 0.625052 16.562 16.612 16.556 16.907 15.372 0.625053 16.880 16.930 16.876 17.218 15.690 0.625054 17.198 17.249 17.196 17.544 16.009 0.625055 17.517 17.568 17.515 17.857 16.328 0.625056 17.835 17.887 17.834 1
45、8.183 16.647 0.625057 18.153 18.205 18.154 18.494 16.965 0.625058 18.471 18.524 18.473 18.820 17.284 0.625059 18.789 18.842 18.793 19.131 17.602 0.625060 19.107 19.161 19.112 19.457 17.921 0.625061 19.426 19.480 19.431 19.769 18.240 0.625062 19.744 19.799 19.750 20.095 18.559 0.625063 20.062 20.117
46、20.070 20.407 18.877 0.625064 20.380 20.435 20.388 20.731 19.195 0.625017ASME B29.2M-2007Table 12 Sprocket Dimensions for Unity Pitch, in. (Contd)Outside DiameterSquare G Max. GuidePitch Rounded Teeth Over Pin Diam. Groove Diam. Gage PinNumber of Teeth Diameter Teeth Note (1) Note (1) Note (1) Diame
47、ter65 20.698 20.754 20.708 21.044 19.514 0.625066 21.016 21.072 21.027 21.368 19.832 0.625067 21.335 21.391 21.346 21.682 20.151 0.625068 21.653 21.710 21.665 22.006 20.470 0.625069 21.971 22.028 21.984 22.319 20.788 0.625070 22.289 22.347 22.303 22.643 21.107 0.625071 22.607 22.665 22.622 22.955 21
48、.425 0.625072 22.926 22.984 22.941 23.280 21.744 0.625073 23.244 23.302 23.259 23.593 22.062 0.625074 23.562 23.621 23.578 23.917 22.381 0.625075 23.880 23.939 23.897 24.230 22.699 0.625076 24.198 24.257 24.216 24.553 23.017 0.625077 24.517 24.577 24.535 24.868 23.337 0.625078 24.835 24.895 24.853 2
49、5.191 23.655 0.625079 25.153 25.213 25.172 25.504 23.973 0.625080 25.471 25.531 25.491 25.828 24.291 0.625081 25.790 25.851 25.809 26.141 24.611 0.625082 26.108 26.169 26.128 26.465 24.929 0.625083 26.426 26.487 26.447 26.778 25.247 0.625084 26.744 26.805 26.766 27.101 25.565 0.625085 27.063 27.125 27.084 27.415 25.885 0.625086 27.381 27.443 27.403 27.739 26.203 0.625087 27.699 27.761 27.722 28.052 26.521 0.625088 28.017 28.079 28.040 28.375 26.839 0.625089 28.335 28.397 28.359 28.689 27.157 0.625090 28.654 28.716 28
