1、ASME B29.8-2002(Revision of ASME B29.8M-1993)LEAF CHAINS,CLEVISES, ANDSHEAVESAN AMERICAN NATIONAL STANDARDCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AN AMERICAN NATIONAL STANDARDLEAF CHAINS,CLEV
2、ISES, ANDSHEAVESASME B29.8-2002(Revision of ASME B29.8M-1993)Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Date of Issuance: August 1, 2002This Standard will be revised when the Society approves th
3、e issuance ofa new edition. There will be no addenda or written interpretations of therequirements of this Standard issued to this edition.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the c
4、riteria forAmerican National Standards. The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate. The proposed code or standard was made available for public reviewand comment that p
5、rovides 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 righ
6、ts asserted inconnection with any items mentioned in this document, and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable letters patent, nor assumeany such liability. Users of a code or standard are expressly advised that determination of t
7、hevalidity of any such patent rights, and the risk of infringement of such rights, is entirely theirown responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME a
8、ccepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies, which precludes the issuanceof interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or other
9、wise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license
10、 with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-CONTENTSForeword ivStandards Committee Roster . viCorrespondence With the B29 Committee . vii1 Leaf Chains . 12 Clevises . 23 Sheaves . 144 Lubrication . 145 Additional Information . 14Figures1 Assembly Showin
11、g 3 H11547 4 Lacing . 12 Assembly Showing 4 H11547 6 Lacing and Parts . 23 Leaf Chain Assemblies and Proportions 34 Clevis Types . 85 General Clevis Proportions 96 General Sheave Proportions . 14Tables1A General Chain Dimensions, in. 51B General Chain Dimensions, mm . 62 Minimum Ultimate Tensile Str
12、ength . 73A Dimensions for Anchor Clevises Type B Leaf Chain, in. 103B Dimensions for Anchor Clevises Type B Leaf Chain, mm . 12Nonmandatory AppendixA Supplementary Information: Lubrication and Maintenance . 15iiiCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo re
13、production or networking permitted without license from IHS-,-FOREWORDFor many years, roller chain manufacturers have furnished a substantial volume of chainsconsisting of link plates assembled on pins without the use of bushings and rollers. Thesechains provide relatively high strength per unit of
14、weight and have found wide usage wheresprockets are not required and high-speed power transmission characteristics are not needed.Previously, variation in link plate thickness, link plate contour, diameter of pins, and themethod of lacing limited its interchangeability and restricted its use. For th
15、ese reasons theAssociation of Roller and Silent Chain Manufacturers appointed a task subcommittee onSeptember 21, 1951 to develop this Standard.The scope of the resultant Standard covers the lacing, pin diameter, diameter of linkplate holes, link plate contour and thickness, chain widths, and minimu
16、m ultimate tensilestrengths. The Standard also recommends clevis and sheave design. Supplementary informationto guide users in the application of these chains appeared in the 1958 edition and wasdeleted in 1960.The 1971 reaffirmation was approved by the American National Standards Institute onSeptem
17、ber 10, 1971.Prior to 1975, all B29.8 leaf chain standards included both Type A and Type B leafchain designs. Type A, the lighter series, was characterized by even or balanced lacing,while Type B, the heavier series, was shown only with uneven or unbalanced lacing ofchain links.During the decade pre
18、ceding 1975, it became increasingly apparent that the use of TypeA leaf chain was declining and that it was being used primarily for replacement. Mostnew design applications used the heavier Type B design either with the standard unevenlacing or with even lacing, which was shown as standard only for
19、 Type A leaf chain. Theincreased use of Type B chain and the desire to simplify chain standards led the AmericanChain Association to undertake a revision of B29.8 to:(a) eliminate Type A leaf chain from the standard;(b) add even lacing (balanced) to the Type B chain series;(c) include a 212in. pitch
20、 chain to the list of Type B chain.These revisions were subsequently included in ANSI B29.8-1977 and approved by theAmerican National Standards Institute on May 4, 1977.In tabulating dimensional information in this Standard, customary inch-pound units havebeen used. Additionally, companion tabulatio
21、ns have been included that provide metric (S.I.)unit conversions of these values in accordance with SI-I, ASME Orientation and Guide forUse of Metric Units. Certain formulas and relationships have intentionally been presentedonly in customary units to eliminate ambiguity between them and the tabulat
22、ed values.Revisions incorporated in ANSI/ASME B29.8M-1985 provided additional information onclevises, clevis pins, minimum sheave size, and lubrication.Revisions incorporated in ASME B29.8M-1993 included changes in format, restatementof the definition of Minimum Ultimate Tensile Strength and, most n
23、otably, minor changesin the standard values for maximum pin diameter and the minimum hole diameter. Thedimensional changes were required to allow a direct, error-free conversion between conven-tional units (inches) and metric units (millimeters).ivCopyright ASME International Provided by IHS under l
24、icense with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Revisions incorporated in ASME B29.8-2002 include the elimination of 8H115478 lacing.Tables 1A and 1B have been revised to show minimum width between outside plates (Lm)and Tables 3A and 3B have been rev
25、ised to show the dimensions for an inside clevis. Anappendix has been added that contains information on lubrication and maintenance, connectand disconnect, and general inspection criteria. Preload and manufacturers identificationmarking have been added in compliance with the requirements of ISO 434
26、7.This Standard was approved by the American National Standards Institute onMarch 27, 2002.vCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME STANDARDS COMMITTEE B29Chains, Attachments, and Sprock
27、ets for PowerTransmission and Conveying(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSJ. L. Wright, ChairC. G. Springman, Vice ChairM. Lo, SecretaryCOMMITTEE PERSONNELW, C. Hall, Ramsey Production Corp.L. E. Hampel, Allied-Locke Industries, Inc.M. Lo,
28、 The American Society of Mechanical EngineersA. M. McCarty, Emerson Power TransmissionD. Moore, Jeffrey Chain Co.R. W. Neuhengen, Drives, Inc.V.D. Petershack, Hitachi Maxco, Ltd.V. E. Skipper, Alternate, Hitachi Maxco, Ltd.R. A. Reinfried, Conveyor Equipment Manufacturers AssociationS. Rhoad, Webste
29、r Industries, Inc.R. J. Rothchild, U.S. Tsubaki, Inc.K. J. Smith, Kone, Inc.C. G. Springman, Diamond Chain Co.J. L. Wright, Diamond Chain Co.viCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-CORRESPO
30、NDENCE WITH THE B29 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with theCommittee by requesting interpretations, proposing revisions, and attending Committeemeetings. Corr
31、espondence should be addressed to:Secretary, B29 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standard to incorporatechanges that appear necessary or desirable, as demonstrated by th
32、e experience gained fromthe application of the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals shouldbe as specific as possible, citing the paragraph number(s), the proposed wording, and adetailed description
33、 of the reasons for the proposal, including any pertinent documentation.Interpretations. Upon request, the B29 Committee will render an interpretation of anyrequirement of the Standard. Interpretations can only be rendered in response to a writtenrequest sent to the Secretary of the B29 Standards Co
34、mmittee.The request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the following format:Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for whi
35、ch the interpretationis being requested.Question: Phrase the question as a request for an interpretation of a specificrequirement suitable for general understanding and use, not as a requestfor an approval of a proprietary design or situation. The inquirer mayalso include any plans or drawings which
36、 are necessary to explainthe question; however, they should not contain proprietary names orinformation.Requests that are not in this format will be rewritten in this format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures pro
37、vide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved byan interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASMEdoes not “approve,”“certify,”“rate,” or “endorse” any item,
38、 construction, proprietary device,or activity.Attending Committee Meetings. The B29 Standards Committee regularly holds meetings,which are open to the public. Persons wishing to attend any meeting should contact theSecretary of the B29 Standards Committee.viiCopyright ASME International Provided by
39、IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-viiiCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME B29.8-2002LEAF CHAINS, CLEVISES, A
40、ND SHEAVES1 LEAF CHAINS1.1 DescriptionA leaf chain consists of a series of link platesalternately assembled with pins in such a way that thejoint is free to articulate between adjoining pitches.Typical assemblies are depicted in Figs. 1 and 2.1.2 Numbering and Marking SystemThe chain described in th
41、is Standard shall carry theprefix BL. The last two digits of the number followingthe prefix denote the lacing. The right-hand digit desig-nates the number of link plates in the articulating pitch.The digit to the left of this designates the number ofplates in the pin link pitch. The digits to the le
42、ft ofthose two digits denote the number of eighths of aninch in the chain pitch.EXAMPLE: BL523 indicates Type BL leaf chain,58in. pitch witha2H11547 3 lacing; that is, two plates in the pin link pitch and threeplates in the articulating link pitch.Chains shall be marked with the manufacturers nameor
43、 trademark.FIG. 1 ASSEMBLY SHOWING 3 H11547 4 LACING11.3 Assemblies and General ProportionsVarious assemblies and general proportions for leafchains are depicted in Fig. 3. Dimensions used in thefigures are as follows:CL p clearanceD p pin diameterDmax.p maximum pin diameterH p link plate heightHmax
44、.p 0.95PLmp minimum width between pin link platesP p chain pitchS p hole diameter of articulating link platesSmin.p approximately Dmax.+ 0.0012 in.T p link plate thicknessTmax.p maximum link plate thickness (based onnormal steel tolerance). (See Table 1A or1B for values or Tmax.)W p width of chain o
45、ver pin endsWmax.p wmax.+ 0.5Dmax.w p width over pin link plateswmax.p (Tmax.+ CL) H11547 number of link plates acrosswidth of chainNOTE: Style of heading pins is optional with the manufacturer.1.4 General Chain Dimensions forInterchangeabilityThe dimensions given in Tables 1A and 1B provideguidance
46、 that will ensure interchangeability and compa-tibility with standard design clevises. It is recommendedCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-LEAF CHAINS, CLEVISES, AND SHEAVESASME B29.8-20
47、02Articulating link plates Center link platesPin link platesFIG. 2 ASSEMBLY SHOWING 4 H11547 6 LACING AND PARTSthat these dimensions be considered for actual minimumand maximum limits. Manufacturers are responsible forthe actual dimensional features of their products.NOTE: Chains from different manu
48、facturers must never be placedtogether within the same application.1.5 Minimum Ultimate Tensile Strength(M.U.T.S.)Minimum Ultimate Tensile Strength (M.U.T.S.), forchain covered by this Standard, is the minimum forceat which an unused, undamaged chain could fail whensubjected to a single tensile load
49、ing test.(a) WARNING: The Minimum Ultimate TensileStrength is not a “working load.” The M.U.T.S. greatlyexceeds the maximum force that may be safely appliedto the chain.(b) Test Procedure: A tensile force is slowly applied,in a uniaxial direction, to the ends of the chain sample.(c) The tensile test is a destructive test. Even thoughthe chain may not visibly fail when subjected to theMinimum Ultim
