1、BS ISO 14728-1:2017Rolling bearings Linearmotion rolling bearingsPart 1: Dynamic load ratings and rating lifeBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 14728-1:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 147
2、28-1:2017. It supersedes BS ISO 14728-1:2004 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/7, Rolling bearings.A list of organizations represented on this committee can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
3、include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 87021 7 ICS 21.100.20 Compliance with a British Standard cannot confer immunity from legal obligations.T
4、his British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 14728-1:2017 ISO 2017Rolling bearings Linear motion rolling bearings Part 1: Dynamic load ratings
5、 and rating lifeRoulements Roulements mouvement linaire Partie 1: Charges dynamiques de base et dure nominaleINTERNATIONAL STANDARDISO14728-1Second edition2017-02Reference numberISO 14728-1:2017(E)BS ISO 14728-1:2017ISO 14728-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2
6、017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission
7、. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 14728-1:2017ISO 14728-1:
8、2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 75 Basic dynamic load ratings 85.1 Linear ball bearings 85.1.1 Recirculating linear ball bearings, sleeve type with raceway grooves 85.1.2 Recirculating linear ball bearings, sleeve type without r
9、aceway grooves 95.1.3 Recirculating linear ball bearings, linear guideway, carriage type . 95.1.4 Non-recirculating linear ball bearings, linear guideway, deep groove and four-point-contact types 105.2 Linear roller bearings 115.2.1 Recirculating linear roller bearings, linear guideway, carriage typ
10、e .115.2.2 Non-recirculating linear roller bearings, linear guideway, flat, V-angle and crossed roller types 116 Dynamic equivalent load 127 Basic rating life 12Bibliography .14 ISO 2017 All rights reserved iiiContents PageBS ISO 14728-1:2017ISO 14728-1:2017(E)ForewordISO (the International Organiza
11、tion 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 technical committee has been established
12、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 electrotechnical standardization.The
13、 procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the ed
14、itorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).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 identifying any or all such patent rights. Details of any patent
15、 rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For
16、an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .htmlThis do
17、cument was prepared by Technical Committee ISO/TC 4, Rolling bearings, Subcommittee SC 8, Load ratings and life.This second edition cancels and replaces the first edition (ISO 14728-1:2004), of which it constitutes a minor revision with the following changes: improvement of Figures 2, 4, 8 and 9; co
18、rrection of terms and definitions (change of ball/roller guide systems to linear ball/roller bearings); correction of font ( changed to ); alignment with the latest drafting rules.A list of parts in the ISO 14728 series can be found on the ISO website.iv ISO 2017 All rights reservedBS ISO 14728-1:20
19、17ISO 14728-1:2017(E)IntroductionIt is often impractical to establish the suitability of a linear motion rolling bearing selected for a specific application by testing. The following procedures have proved to be an appropriate and convenient substitute for testing: life calculation with dynamic load
20、 (ISO 14728-1); static load safety factor calculation with static load (ISO 14728-2).The life of a linear motion bearing is given by the distance which one of the raceways moves, in relation to the other raceway, before the first evidence of fatigue develops in the material of one of the raceways or
21、 one of the rolling elements.The formulae for calculating the basic dynamic load ratings are derived from the theory of Lundberg7and Palmgren8. ISO 2017 All rights reserved vBS ISO 14728-1:2017BS ISO 14728-1:2017Rolling bearings Linear motion rolling bearings Part 1: Dynamic load ratings and rating
22、life1 ScopeThis document specifies methods of calculating the basic dynamic load rating and basic rating life for linear motion rolling bearings manufactured from contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice and basically of convent
23、ional design as regards the shape of the rolling contact surfaces. The life of linear motion rolling bearings is defined and the conditions are established for reliable life calculations.This document is not applicable to designs where the rolling elements operate directly on the slide surface of th
24、e machine equipment, unless that surface is equivalent in all respects to the raceway of the linear motion rolling bearing component it replaces.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the terms and definition
25、s given in ISO 281 and ISO 5593, and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1r
26、ecirculating linear ball bearing, sleeve type, with or without raceway groovesbasically cylindrical sleeve provided with a number of closed loops of recirculating balls designed to achieve linear rolling motion along a hardened cylindrical shaftNote 1 to entry: See Figure 1.Note 2 to entry: The race
27、ways in the sleeve can be designed cylindrical as well as steel inserts with raceway grooves parallel to the axis.INTERNATIONAL STANDARD ISO 14728-1:2017(E) ISO 2017 All rights reserved 1BS ISO 14728-1:2017ISO 14728-1:2017(E)Figure 1 Recirculating linear ball bearing, sleeve type3.2recirculating lin
28、ear ball (or roller) bearing, linear guideway, carriage typelinear ball (or roller) bearing provided with a number of symmetrically arranged, closed loops of recirculating balls (or rollers) designed to achieve linear rolling motion along a hardened guideway furnished with adequate racewaysNote 1 to
29、 entry: See Figure 2.Figure 2 Recirculating linear ball (or roller) bearing, linear guideway, carriage type2 ISO 2017 All rights reservedBS ISO 14728-1:2017ISO 14728-1:2017(E)3.3non-recirculating linear ball bearing, linear guideway, deep groove typelinear bearing with balls as rolling elements, eac
30、h ball having two points of contactNote 1 to entry: See Figure 3.Note 2 to entry: The cross-sectional radii of the raceway grooves in the two guideways are equal and may lie between 0,52 Dwand infinity.Figure 3 Non-recirculating linear ball bearing, linear guideway, deep groove type3.4non-recirculat
31、ing linear ball bearing, linear guideway, four-point-contact typelinear bearing with balls as rolling elements, each ball having four points of contactNote 1 to entry: See Figure 4.Note 2 to entry: The cross-sectional radii of the raceway grooves for the four points of contact in the two guideways a
32、re equal and may lie between 0,52 Dwand infinity.Figure 4 Non-recirculating linear ball bearing, linear guideway, four-point-contact type ISO 2017 All rights reserved 3BS ISO 14728-1:2017ISO 14728-1:2017(E)3.5non-recirculating linear roller bearing, linear guideway, flat typelinear bearing with need
33、le rollers or cylindrical rollers as rolling elementsNote 1 to entry: See Figure 5.Figure 5 Non-recirculating linear roller bearing, linear guideway, flat type3.6non-recirculating linear roller bearing, linear guideway, V-angle typelinear bearing with guideways designed as parts of a V with a 90 ang
34、leNote 1 to entry: See Figure 6.Note 2 to entry: Needle rollers or cylindrical rollers are used as rolling elements.Figure 6 Non-recirculating linear roller bearing, linear guideway, V-angle type4 ISO 2017 All rights reservedBS ISO 14728-1:2017ISO 14728-1:2017(E)3.7non-recirculating linear roller be
35、aring, linear guideway, crossed roller typelinear bearing with cylindrical rollers arranged in a crossed roller constructionNote 1 to entry: See Figure 7.Figure 7 Non-recirculating linear roller bearing, linear guideway, crossed roller type3.8lifedistance one of the raceways moves in relation to the
36、 other raceway before the first evidence of fatigue develops in the material of one of the raceways or one of the rolling elements3.9reliabilitypercentage of the group that is expected to attain or exceed a specified lifeNote 1 to entry: The reliability of an individual linear motion rolling bearing
37、 is the probability that the bearing will attain or exceed a specified life.3.10basic rating lifelife associated with 90 % reliability, with contemporary, commonly used material and manufacturing quality and under conventional operating conditions3.11basic dynamic load rating of a linear motion roll
38、ing bearingconstant stationary load that a linear motion rolling bearing could theoretically endure for a basic rating life of 105mNote 1 to entry: If a basic rating life of 5 104m is used to define the basic dynamic load rating, then a conversion factor should be used as shown below: for basic dyna
39、mic load rating of linear ball bearings:CC10050126BB=, for basic dynamic load rating of linear roller bearings:CC10050123RR=, ISO 2017 All rights reserved 5BS ISO 14728-1:2017ISO 14728-1:2017(E)3.12dynamic equivalent loadconstant stationary load under the influence of which a linear motion rolling b
40、earing would have the same life as it would attain under the actual load conditions3.13direction of loaddirection of load applied for load rating calculationNote 1 to entry: For calculation of basic dynamic load ratings, the direction of the load is defined for all linear motion bearings as shown by
41、 the arrows in Figure 8.Rolling bearing defined in3.1 3.2 3.4 3.7Figure 8 Direction of load3.14pitch diameterdiameter of the circle containing the centres of the balls in contact with the raceways, in a plane perpendicular to the bearing axis3.15nominal contact angleangle between the direction of lo
42、ad on the linear bearing and the nominal line of action of the resultant of the forces transmitted by a bearing raceway member to a rolling elementNote 1 to entry: See Figure 9.Figure 9 Nominal contact angle6 ISO 2017 All rights reservedBS ISO 14728-1:2017ISO 14728-1:2017(E)4 SymbolsFor the purposes
43、 of this document, the symbols given in ISO 281, ISO 15241 and Table 1 apply.Table 1 Symbols, terms and unitsSymbol Term UnitbmRating factor for contemporary, commonly used, high quality, hardened bearing steel in accordance with good manufacturing practice, the value of which varies with bearing ty
44、pe and design1C Basic dynamic load rating NC0Basic static load rating NC50BBasic dynamic load rating for linear ball bearings calculated for a basic rating life of 5 104mNC50RBasic dynamic load rating for linear roller bearings calculated for a basic rating life of 5 104mNC100BBasic dynamic load rat
45、ing for linear ball bearings calculated for a basic rating life of 105m NC100RBasic dynamic load rating for linear roller bearings calculated for a basic rating life of 105m NcLAdjustment factor for recirculating linear ball bearings, sleeve type, with or without race-way grooves, applicable in the
46、calculation of load ratings1DpwPitch diameter of ball rows mmDwBall diameter mmDweRoller diameter applicable in the calculation of load ratings mmF Load on bearing NfcFactor that depends on the geometry of the bearing components, the accuracy to which the various components are made, and on the mate
47、rial1fsCorrection factor for short stroke application, applicable for recirculating linear ball bear-ings, sleeve type with or without grooves, specified by the manufacturer1iNumber of rows of balls or rollers applicable in the calculation of load ratingsNOTE In the case of recirculating linear bear
48、ings, sleeve type, it is the total number of rows of balls.1itNumber of load-carrying rows of balls in loaded zone 90 j +90 of recirculating line-ar ball bearings, sleeve type, with or without raceway grooves, applicable in the calculation of load ratings1kFDynamic load factor 1kiFactor for recircul
49、ating linear ball bearings, sleeve type, with or without raceway grooves, applicable in the calculation of load ratings1LweRoller length applicable in the calculation of load ratings mmL10Basic rating life associated with 90 % reliability 105mlsTravel length of linear bearings mmltRaceway length applicable in the calculation of load ratings. For recirculating linear bear-ings, that of sleeve or carriage, determined by the manufacturer, and for non-recirculating linear bearings, that o
