1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRolling bearings Symbols for physical quantitiesBS ISO 15241:2012National forewordThis British Standard is the UK implementation of ISO 15241:2012. It supersedes BS ISO 15241:200
2、1 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/7, Rolling bearings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a c
3、ontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 76133 1 ICS 01.075; 21.100.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published u
4、nder the authority of the Standards Policy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS ISO 15241:2012 ISO 2012Rolling bearings Symbols for physical quantities Roulements Symboles relatifs aux grandeursINTERNATIONAL STANDARDI
5、SO15241Second edition2012-06-15Reference numberISO 15241:2012(E)BS ISO 15241:2012ISO 15241:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means
6、, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso
7、.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 15241:2012ISO 15241:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions . 14 Symbols for physical quantities 14.1 Principles of the system of symbols 14.2 Symbols Composition . 24
8、.3 Basic symbols 24.4 Subscripts . 24.5 Style of printing/reproduction of symbols 25 Classification of symbols for physical quantities 26 Definitions of physical quantities . 37 Use of square brackets 38 Presentation of symbols for physical quantities 39 Index .15BS ISO 15241:2012ISO 15241:2012(E)Fo
9、rewordISO (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 committees. Each member body interested in a subject for which a tech
10、nical 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 International Electrotechnical Commission (IEC) on all matters of
11、 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 Standards adopted by the technical committees are circulated to
12、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 subject of patent rights. ISO shall not be held responsible for id
13、entifying any or all such patent rights.ISO 15241 was prepared by Technical Committee ISO/TC 4, Rolling bearings.This second edition cancels and replaces the first edition (ISO 15241:2001), which has been technically revised. In particular, references ISO 31-0 and ISO 31-11 have been replaced by ISO
14、 80000-1 and ISO 80000-2, respectively. ISO 281:1990/Amd.1:2000 has been replaced by the new edition of ISO 281 as well. In addition, items 8.04, 8.05, 8.11 and 8.14 in Table 10 have been deleted, which means that other item numbers in Table 10 have been updated.iv ISO 2012 All rights reservedBS ISO
15、 15241:2012INTERNATIONAL STANDARD ISO 15241:2012(E)Rolling bearings Symbols for physical quantities 1 ScopeThis International Standard establishes the presentation of symbols for physical quantities (dimensions, dimensional tolerances, accuracy, load ratings, life, etc.) in the field of rolling bear
16、ings. These symbols are primarily intended for use in International Standards and ISO documents relating to rolling bearings, but they are also suitable for use in other printed materials, such as handbooks, illustrations/drawings and pamphlets.2 Normative referencesThe following documents, in whole
17、 or in part, are normatively referenced in this document and are dispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 281, Rolling bearings Dynamic load rati
18、ngs and rating lifeISO 1132-1, Rolling bearings Tolerances Part 1: Terms and definitionsISO 5593, Rolling bearings VocabularyISO 80000-1, Quantities and units Part 1: GeneralISO 80000-2, Quantities and units Part 2: Mathematical signs and symbols to be used in the natural sciences and technology3 Te
19、rms and definitionsFor the purposes of this document, the terms and definitions given in ISO 281, ISO 1132-1 and ISO 5593 apply.4 Symbols for physical quantities4.1 Principles of the system of symbolsThe following principles apply in this International Standard. Generally, the principles of the syst
20、em of symbols shall be in accordance with ISO 80000-1 and ISO 80000-2. Symbols for physical quantities used in the field of rolling bearings are defined as quantities in physics. Symbols for dimensionless values such as coefficients, factors and parameters are thus also involved. Mathematical variab
21、les, e.g. probability (n), are also included. Subscripts of subscripts shall not be adopted; for example the subscript letters “dmp” of Vdmpshall be reproduced in the same point size. The form Vdmpshould not be used (see Figure 1). Superscripts shall not be used. ISO 2012 All rights reserved 1BS ISO
22、 15241:2012ISO 15241:2012(E)Figure 1 Principle of symbols4.2 Symbols CompositionThe symbols for physical quantities shall be shown as basic symbols, which are single letters from the Latin or Greek alphabet, or basic symbols with subscripts, composed of one or more letters of the accepted Latin or G
23、reek alphabet or Arabic numerals. They shall not be followed by a full stop.4.3 Basic symbolsBasic symbols represent physical quantities and may sometimes represent different physical quantities. The typical basic symbols are shown in Table 1.4.4 SubscriptsSubscripts appended to a basic symbol modif
24、y the basic physical quantity with respect to properties, feature, numbering, etc. The subscripts used are shown in Table 2. Subscripts representing physical quantities have the same typography as the basic symbols (e.g. Vdmp, ds).4.5 Style of printing/reproduction of symbolsBasic symbols shall be p
25、rinted/reproduced in italic (sloping) typeface with serifs. Subscripts representing physical quantities shall be printed/reproduced in italic typeface with serifs. Subscripts representing numbers and other symbols shall be printed/reproduced in roman (upright) typeface, e.g. e (with respect to outer
26、 ring), r (radial), d (with respect to bore). All subscript characters shall be of the same point size.EXAMPLE 1 In Vdmp(variation of mean bore diameter), subscript “d” represents “bore diameter” and is printed/reproduced in italic typeface. Subscripts “m” representing “mean” and “p” representing “i
27、n a single plane” are printed/reproduced in roman typeface. The subscript characters have the same point size.EXAMPLE 2 In Sd(perpendicularity of inner ring face with respect to the bore), “d” represents “per bore surface” and is reproduced/printed in roman typeface.5 Classification of symbols for p
28、hysical quantitiesSymbols are classified as follows in Tables 3 to 10: dimensions and features for bearings, rings and washers (see Table 3); dimensions and tolerances for bearings, rings and washers (see Table 4); running accuracy for bearings, rings and washers (see Table 5); dimensions and tolera
29、nces for subunits (see Table 6); dimensions and tolerances for rolling elements (see Table 7); dimensions for shafts and housings (see Table 8);2 ISO 2012 All rights reservedBS ISO 15241:2012ISO 15241:2012(E) bearing loads and load ratings (see Table 9); bearing life (see Table 10).6 Definitions of
30、physical quantitiesDefinitions of physical quantities shall be in accordance with ISO 5593 and ISO 1132-1; in certain cases, definitions of physical quantities shall conform to other relevant International Standards concerning rolling bearings.7 Use of square bracketsIf two closely related physical
31、quantities in Tables 3 to 10 are defined by the same text, apart from a few words, the physical quantities and their descriptions shall be grouped in a single entry. The words that are substituted for those which precede them in order to obtain the different meanings shall be placed in square bracke
32、ts, i.e. “ ”.8 Presentation of symbols for physical quantitiesThe symbols used in the field of rolling bearings are presented in Tables 1 to 10. ISO 2012 All rights reserved 3BS ISO 15241:2012ISO 15241:2012(E)Table 1 Basic symbolsProperty Basic symbol Physical quantityDimension A width of housing B
33、widthheight of shaft washerC width of outer ringheight of housing washerD outside diameterdiameter of outer ring or housing washer except diameter of racewaydiameter of bearing seatd bore diameterdiameter of inner ring or shaft washer except diameter of racewayE diameter of raceway for outer ringF d
34、iameter of raceway for inner ringG designation of a screw threadH eccentricitycentre height of housingJ centre distance between bolt holesL length of housing or rollerl length of screw threadN dimension of bolt holer chamfer dimension(groove) radiuss (washer) thicknessT (assembled) widthheightTolera
35、nce and running accuracyK radial runoutvariation in thicknessS axial runoutvariation in thickness (thrust bearing)V variation of dimension deviation from nominal dimensionLoad and life C load ratingF bearing loadL lifeP equivalent loadQ load on rolling elementOthers G internal clearancei number of r
36、ows of rolling elementsZ number of rolling elements per row contact angle or angle of taper4 ISO 2012 All rights reservedBS ISO 15241:2012ISO 15241:2012(E)Table 2 SubscriptsProperty Subscript DefinitionGeneral e effectivem arithmetical meanmax maximum or greatest limitmin minimum or least limitp pla
37、ne in which measurement is mades single or actual0 static (zero)Direction a axialr radialPart or feature a assembleda, b, c, . . . identification symbol where there is more than one diameter applied to closely associated parts (e.g. shaft, housing, spacer, collar)c cageD per outside surfaced per bor
38、e surfacee outer ring or housing washeri inner ring or shaft washerw rolling element1, 2, 3, . . . identification number where there is more than one diameter, width or height, applied to primarily associated parts (e.g. aligning housing ring, aligning seat washer, locating snap ring and loose rib)L
39、ife a adjustedh time, hoursm modifiedn probability of failure, related to (100 n) % reliability10 90 % reliability (n = 10)50 50 % reliability (n = 50)Others L lot or gauge lotNOTE For subscripts, see 4.4. ISO 2012 All rights reserved 5BS ISO 15241:2012ISO 15241:2012(E)Table 3 Dimensions and feature
40、s for bearings, rings and washersItem No.Symbol Physical quantity Reference No. ISO 55931.01 A centre height of aligning surface 04.03.151.02 a distance specifying the location of a bearing load centre 1.03 B bearing width 04.03.041.04 inner ring width 04.04.051.05 shaft washer height 04.04.061.06 B
41、1, B2, . . . axial dimension of inner ring shaft washer 1.07 axial dimension of part primarily associated with an inner ring shaft washer1.08 b snap ring groove width 04.03.121.09 C outer ring width 04.04.051.10 housing washer height 04.04.061.11 C1outer ring flange width 04.03.091.12 C1, C2, . . .
42、axial dimension of outer ring housing washer 1.13 axial dimension of part primarily associated with an outer ring housing washer1.14 D bearing outside diameter 04.03.031.15 outside diameter of outer ring housing washer 1.16 outside diameter of thrust washer1.17 D1outside diameter of outer ring flang
43、e 1.18 D1, D2, . . . outer ring housing washer diameter (except raceway diameter) 1.19 d bearing bore diameter 04.03.021.20 bore diameter of inner ring shaft washer 1.21 bore diameter of thrust washer1.22 dGnominal diameter of screw thread (external or internal) 1.23 dG1, dG2, . . . diameter of part
44、 primarily associated with a screw thread 1.24 d1, d2, . . . inner ring shaft washer diameter (except raceway diameter) 1.25 Ewoutside diameter of ball complement 04.04.141.26 outside diameter of roller complement 04.04.151.27 e snap ring section height 1.28 Fwbore diameter of ball complement 04.04.
45、141.29 bore diameter of roller complement 04.04.151.30 f snap ring thickness 1.31 G designation of a screw threada1.32 i number of rows of rolling elements 1.33 lGlength of screw thread 1.34 lG1, lG2, . . . axial dimension associated with a screw thread 1.35 r chamfer dimension 04.03.061.36 regroove
46、 radius of outer ring housing washer raceway 1.37 rigroove radius of inner ring shaft washer raceway 1.38 r1, r2, . . . chamfer dimension 04.03.061.39 s thickness of thrust washer 1.40 T (assembled) bearing width 04.03.041.41 bearing height 04.03.056 ISO 2012 All rights reservedBS ISO 15241:2012ISO
47、15241:2012(E)Item No.Symbol Physical quantity Reference No. ISO 55931.42 T1, T2, . . . axial dimension of (assembled) bearing 1.43 Z number of rolling elements per row 1.44 contact angle 04.02.101.45 angle of taper (half the cone angle) of inner ring bore aThe designation of a screw thread comprises
48、 the thread form symbol, the nominal diameter and, if it is needed, the thread pitch, e.g. M16 1,5.Table 4 Dimensions and tolerances for bearings, rings and washersItem No. Symbol Physical quantityReference No.ISO 5593 ISO 1132-12.01 B nominal bearing width 05.02.06 5.3.102.02 nominal inner ring wid
49、th 05.02.01 5.3.12.03 nominal shaft washer height 2.04 Bmmean inner ring width 05.02.05 5.3.52.05 mean shaft washer height 2.06 Bssingle inner ring width 05.02.02 5.3.22.07 single shaft washer height 2.08 C nominal bearing width 05.02.06 5.3.102.09 nominal outer ring width 05.02.01 5.3.12.10 nominal housing washer height 2.11 Cmmean outer ring width 05.02.05 5.3.52.12 mean housing washer height 2.13 Cssingle outer ring width
