1、BRITISH STANDARD BS ISO 155:1998 Belt drives Pulleys Limiting values for adjustment of centres ICS21.220.10BSISO155:1998 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect
2、on 15 March 1999 BSI 05-1999 ISBN 0 580 30355 1 National foreword This British Standard reproduces verbatim ISO155:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/10, Belt and pulley drives, which has the responsibi
3、lity to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list o
4、f organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International
5、Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British S
6、tandard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title page, pages ii to iv, pages1 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendme
7、nts incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO155:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO155 1ii blankBSISO155:1998 ii BSI 05-1999 Conten
8、ts Page Foreword iii 1 Scope 1 2 Normative reference 1 3 Symbols 1 4 Specifications 1 Annex A (informative) Bibliography 4 Figure 1 1 Table 1 Factors i and s 2 Table 2 Diameter tolerance for flat pulley 2 Table 3 Datum widths for V-belts 2 Table 4 Effective widths for joined V-belts 3 Table 5 Groove
9、 pitch for V-ribbed belts 3 Table 6 Values if i 1for synchronous belts 3 Table 7 Values of s 4related to belt material 3BSISO155:1998 BSI 05-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
10、 of preparing International Standards is normally carried out through ISO technical committees. 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-governmen
11、tal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting
12、. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO155 was prepared by Technical Committee ISO/TC41, Pulleys and belts (including veebelts), Subcommittee SC1, Veebelts and grooved pulleys. This third edition canc
13、els and replaces the second edition (ISO155:1989), which has been technically revised. In particular, the grooved pulleys for V-ribbed belts have been added. Annex A of this International Standard is for information only. Descriptors: Belt drives, pulleys, adjustment, dimensions.iv blankBSISO155:199
14、8 BSI 05-1999 1 1 Scope This International Standard specifies the limiting values for the adjustment of centres of two transmission pulleys. It is applicable to crowned pulleys for flat belts; grooved pulleys for V-belts, either single, multiple or joined; grooved pulleys for V-ribbed belts; toothed
15、 pulleys for synchronous belts. NOTEAll dimensions are expressed in millimetres. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of the publication, the edition indicated was val
16、id. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Stan
17、dards. ISO5294:1989, Synchronous belt drives Pulleys. 3 Symbols 4 Specifications Limiting values for adjustment of centre distance are specified in terms of factors i and s which are respectively subtracted from and added to the nominal centre distance, E (see Figure 1). Values of i and s shall be r
18、ounded to the nearest millimetre. Values of i and s are expressed as the sums of various components parts: i =i 1 + i 2 (slack-off) s =s 1 + s 2 + s 3 + s 4 (take-up) where i 1and s 1relate to the pulley dimensions and tolerances; i 2and s 2relate to belt length tolerances; s 3relates to flat pulley
19、 crowning; s 4relates to elastic properties of the belt. Factors with subscripts1 to3 determine the centre distance adjustment necessary to install a belt onto the pulleys and to readjust working tension. Factor s 4 determines the centre distance adjustment necessary to maintain correct operation of
20、 a belt under the influence of belt extension and dimensional wear. NOTEThese limiting values should be considered by the belt manufacturers as maxima, and by the designers and makers of the machinery as minima. E =Nominal centre distance E i =Lower limit for the adjustment of centre distance E + s
21、=Upper limit for the adjustment of centre distance L =Nominal belt length d 1 =Limits of small flat pulley diameter D 2 =Limits of large flat pulley diameter w d =Datum width of a V-groove W e =Effective width of a V-groove e =Groove pitch of a V-ribbed pulley p b = Pitch of synchronous belt teeth F
22、igure 1 BSISO155:1998 2 BSI 05-1999 5 Factors Table 1 Factors i and s Table 2 Diameter tolerance for flat pulley Table 3 Datum widths for V-belts Factors Belt type Variation of centre distance Flat Classical and narrow V-belt V-ribbed Synchronous individual joined i 1 2( 1 + 2 ) 2 w d 5,1w e 5,1 e a
23、 (seeTable 6) Slack-off i 2 0,01L 0,009L 0,009L 0 s 1 1,5( 1 + 2 ) 0 0 0 0 s 2 0,01 L 0,009 L 0,009 L 0 s 3 0,003(d + D) 0 0 0 Take-up s 4 (seeTable 7) 0,011 L (see Table 7) 0,005 L a In case of the pulleys with flanges, the value shall be agreed with the belt manufacturers. d 1 d 2 mm mm mm mm 40 0
24、,5 800 to1000 6,3 45 and50 0,6 1120 to1400 8 56 and63 0,8 1600 to2000 10 71 and80 1 90 to112 1,2 125 and140 1,6 160 to200 2 224 and250 2,5 280 to355 3,2 400 to500 4 560 to710 5 Classical section Narrow section Datum width w d mm Y Z A B C D E SPZ SPA SPB SPC 5,3 8,5 11 14 19 27 32BSISO155:1998 BSI 0
25、5-1999 3 Table 4 Effective widths for joined V-belts Table 5 Groove pitch for V-ribbed belts Table 6 Values of i 1for synchronous belts Table 7 Values of s 4related to belt material Classical section Effective width w e Narrow section Effective width w e mm mm AJ BJ CJ DJ 13 16,5 22,4 32,8 9J 15J 20
26、J 25J 8,9 15,2 20,9 25,4 Profile Groove pitch e mm PH PJ PK PL PM 1,6 2,34 3,56 4,7 9,4 Pitch designation i 1 a p b mm With flange on belt assembly side of large pulley or on both pulleys With flange on belt assembly side of small pulley only Without flange on belt assembly side MXL XXL XL L H XH XX
27、H 2,032 3,175 5,08 9,525 12,7 22,225 31,75 2,5 p b 2,5 p b 1,8 p b 1,5 p b 1,5 p b 2 p b 2 p b 1,3 p b 0,9 p b a Values are valid for minimum flange heights as specified in ISO5294:1989,Table 7. If these flange heights are exceeded, the centre adjustment values should be increased accordingly. Mater
28、ial of belt, tensile members s 4 Low modulus of elasticity, for example polyamide or similar Mid modulus of elasticity, for example polyester or similar High modulus of elasticity, for example aramid, glass fibre or metal 0,016 L 0,011 L 0,005 LBSISO155:1998 4 BSI 05-1999 Annex A (informative) Bibli
29、ography 1 ISO22:1991, Flat transmission belts and corresponding pulleys Dimensions and tolerances. 2 ISO4183:1995, Belt drives Classical and narrow V-belts Grooved pulleys (system based on datum width). 3 ISO4184:1992, Belt drives Classical and narrow V-belts Length in datum system. 4 ISO5290:1993,
30、Belt drives Grooved pulleys for joined narrow V-belts Grooved sections9J,15J,20J and25J (effective system). 5 ISO5291:1993, Belt drives Grooved pulleys for joined classical V-belts Grooved sections AJ, BJ, CJ and DJ (effective system). 6 ISO5296-1:1989, Synchronous belt drives Belts Part1: Pitch cod
31、es MXL, HL, L, H, HX and XXH Metric and inch dimensions. 7 ISO5296-2:1989, Synchronous belt drives Belts Part2: Pitch codes MXL and XXL Metricdimensions. 8 ISO8419:1994, Belt drives Narrow joined V-belts Length in effective system. 9 ISO9982:1998, Belt drives Pulleys and V-ribbed belts for industria
32、l applications PH, PJ, PK, PL and PM profiles: Dimensions.blankBS ISO 155:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the internatio
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