1、Plain bearings Terms, definitions, classification and symbolsPart 1: Design, bearing materials and their propertiesBS ISO 43781:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Plain bearings Terms, definitions, classification and symbols Part 1: Design,
2、bearing materials and their propertiesPaliers lisses Termes, dfinitions, classification et symboles Partie 1: Conception, matriaux pour paliers et leurs propritsINTERNATIONAL STANDARDISO4378-1Fourth edition2017-07Reference numberISO 4378-1:2017(E)National forewordThis British Standard is the UK impl
3、ementation of ISO 43781:2017. It supersedes BS ISO 43781:2009, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/12, Plain bearings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication doe
4、s not purport to 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 92941 0ICS 21.100.10; 01.040.21Compliance with a British Standard cannot confer immunit
5、y from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 43781:2017 ISO 2017Plain bearings Terms, definitions, classification
6、and symbols Part 1: Design, bearing materials and their propertiesPaliers lisses Termes, dfinitions, classification et symboles Partie 1: Conception, matriaux pour paliers et leurs propritsINTERNATIONAL STANDARDISO4378-1Fourth edition2017-07Reference numberISO 4378-1:2017(E)BS ISO 43781:2017ISO 4378
7、-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, 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,
8、or posting on the internet or an intranet, without prior written permission. 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
9、 +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 43781:2017ISO 4378-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any for
10、m or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. 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
11、 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 4378-1:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 1Bibliography .39 ISO 2017 All rights reserved iiiContents PageBS ISO 43781:2017ISO
12、 4378-1:2017(E)ForewordISO (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
13、 for which a technical 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)
14、on all matters of electrotechnical standardization.The 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 not
15、ed. This document was drafted in accordance with the editorial 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 identifyi
16、ng any or all such patent rights. Details of any patent 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 convenien
17、ce of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, 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 Technica
18、l Barriers to Trade (TBT), see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 6, Terms and common items.This fourth edition cancels and replaces the third edition (ISO 4378-1:2009), which has been te
19、chnically revised. The following changes have been made: editorial revision of the document; addition of Figures 3, 4, 5, 6, 7, 8, 9, 18, 19, 36, 37, 40, 44 and 49 and technical revision of the other figures; revision of clause numbers.A list of all the parts in the ISO 4378 series can be found on t
20、he ISO website.iv ISO 2017 All rights reservedBS ISO 43781:2017ISO 4378-1:2017(E)ForewordISO (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
21、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-governmental, in liaison with ISO, also take part in the work. ISO collaborates
22、 closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The 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 crit
23、eria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial 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
24、 of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent 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
25、 name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherenc
26、e to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 6, Terms and common items.This fourth edition cancels a
27、nd replaces the third edition (ISO 4378-1:2009), which has been technically revised. The following changes have been made: editorial revision of the document; addition of Figures 3, 4, 5, 6, 7, 8, 9, 18, 19, 36, 37, 40, 44 and 49 and technical revision of the other figures; revision of clause number
28、s.A list of all the parts in the ISO 4378 series can be found on the ISO website.iv ISO 2017 All rights reserved ISO 4378-1:2017(E)IntroductionAs there is a large number of multiple designations in the domain of plain bearings, there is a considerable risk of error in the interpretation of standards
29、 and technical literature. This uncertainty leads to the continuous addition of supplementary designations, which only serves to increase the misunderstanding.This document is an attempt to establish a uniform basic system of designations of design, bearing materials and their properties. ISO 2017 A
30、ll rights reserved vBS ISO 43781:2017BS ISO 43781:2017Plain bearings Terms, definitions, classification and symbols Part 1: Design, bearing materials and their properties1 ScopeThis document specifies the most commonly used terms relating to design, bearing materials and their properties of plain be
31、arings with their definitions and classification.For some terms and word combinations, their short forms are given, which can be used where they are unambiguous. Self-explanatory terms are given without definitions.2 Normative referencesThere are no normative references in this document.3 Terms and
32、definitionsFor the purposes of this document, the following terms and definitions 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
33、t t p :/ www .iso .org/ obp3.1 General terms3.1.1bearingmechanical component by means of which a part in relative motion is supported and/or guided with respect to other parts of a mechanism3.1.2plain bearingsliding bearingbearing (3.1.1) in which the type of relative motion is sliding3.1.3plain bea
34、ring unitmechanical component of a tribological system including a plain bearing (3.1.2), its supporting part (e.g. a housing), a shaft and a lubricating system3.2 Types of plain bearings and classification3.2.1 Classification according to the type of load3.2.1.1statically loaded plain bearingplain
35、bearing (3.1.2) operating under a load constant in magnitude and directionINTERNATIONAL STANDARD ISO 4378-1:2017(E) ISO 2017 All rights reserved 1BS ISO 43781:2017ISO 4378-1:2017(E)3.2.1.2dynamically loaded plain bearingplain bearing (3.1.2) operating under a load changing in magnitude and/or direct
36、ion3.2.2 Classification according to the direction of the acting load3.2.2.1plain journal bearingjournal bearingplain bearing (3.1.2) in which the load acts radially to the axis of the rotating shaftNote 1 to entry: See Figures 1 and 3.Figure 1 Plain journal bearing3.2.2.2plain thrust bearingthrust
37、bearingplain bearing (3.1.2) in which the load acts along the axis of the rotating shaftNote 1 to entry: See Figure 2.Figure 2 Plain thrust bearing2 ISO 2017 All rights reservedBS ISO 43781:2017ISO 4378-1:2017(E)3.2.1.2dynamically loaded plain bearingplain bearing (3.1.2) operating under a load chan
38、ging in magnitude and/or direction3.2.2 Classification according to the direction of the acting load3.2.2.1plain journal bearingjournal bearingplain bearing (3.1.2) in which the load acts radially to the axis of the rotating shaftNote 1 to entry: See Figures 1 and 3.Figure 1 Plain journal bearing3.2
39、.2.2plain thrust bearingthrust bearingplain bearing (3.1.2) in which the load acts along the axis of the rotating shaftNote 1 to entry: See Figure 2.Figure 2 Plain thrust bearing2 ISO 2017 All rights reserved ISO 4378-1:2017(E)3.2.2.3journal thrust bearingflanged bearingplain bearing (3.1.2) capable
40、 of supporting a load in both the axial and radial directions3.2.3 Classification according to the type of lubrication3.2.3.1hydrodynamic bearingplain bearing (3.1.2) operating under conditions of hydrodynamic lubricationNote 1 to entry: See Figure 3.Key1 oil film pressure distributionFigure 3 Hydro
41、dynamic bearing ISO 2017 All rights reserved 3BS ISO 43781:2017ISO 4378-1:2017(E)3.2.3.2hydrostatic bearingexternally pressurized bearingplain bearing (3.1.2) operating under conditions of hydrostatic lubricationNote 1 to entry: See Figure 4.Figure 4 Hydrostatic bearing3.2.3.3hydrodynamic gas bearin
42、ghydrodynamic air bearingplain bearing (3.1.2) operating under conditions of hydrodynamic gas/air lubrication3.2.3.4hydrostatic gas bearinghydrostatic air bearingplain bearing (3.1.2) operating under conditions of hydrostatic gas/air lubrication 4 ISO 2017 All rights reservedBS ISO 43781:2017ISO 437
43、8-1:2017(E)3.2.3.2hydrostatic bearingexternally pressurized bearingplain bearing (3.1.2) operating under conditions of hydrostatic lubricationNote 1 to entry: See Figure 4.Figure 4 Hydrostatic bearing3.2.3.3hydrodynamic gas bearinghydrodynamic air bearingplain bearing (3.1.2) operating under conditi
44、ons of hydrodynamic gas/air lubrication3.2.3.4hydrostatic gas bearinghydrostatic air bearingplain bearing (3.1.2) operating under conditions of hydrostatic gas/air lubrication 4 ISO 2017 All rights reserved ISO 4378-1:2017(E)3.2.3.5squeeze film bearingplain bearing (3.1.2) in which complete separati
45、on of sliding surfaces is caused by the pressure developed in the lubricant film as a result of their approach in the direction normal to the surfaceNote 1 to entry: See Figure 5.Key1 lubricant2 loadFigure 5 Squeeze film bearing3.2.3.6hybrid bearingplain bearing (3.1.2) operating under conditions of
46、 both hydrostatic and hydrodynamic lubrication ISO 2017 All rights reserved 5BS ISO 43781:2017ISO 4378-1:2017(E)3.2.3.7solid-film lubricated bearingplain bearing (3.1.2) operating with a solid lubricantNote 1 to entry: See Figure 6.Key1 solid lubricantFigure 6 Solid film lubricated bearing3.2.3.8unl
47、ubricated bearingplain bearing (3.1.2) operating without a lubricant3.2.3.9self-lubricating bearingplain bearing (3.1.2) lubricated by the bearing material (3.6.1), by the material components or by solid lubricant overlays 6 ISO 2017 All rights reservedBS ISO 43781:2017ISO 4378-1:2017(E)3.2.3.7solid
48、-film lubricated bearingplain bearing (3.1.2) operating with a solid lubricantNote 1 to entry: See Figure 6.Key1 solid lubricantFigure 6 Solid film lubricated bearing3.2.3.8unlubricated bearingplain bearing (3.1.2) operating without a lubricant3.2.3.9self-lubricating bearingplain bearing (3.1.2) lub
49、ricated by the bearing material (3.6.1), by the material components or by solid lubricant overlays 6 ISO 2017 All rights reserved ISO 4378-1:2017(E)3.2.3.10porous self-lubricating bearingsintered bearingoil-impregnated sintered bearingbearing (3.1.1), the sliding part of which consists of material having communicating pores filled with lubricantNote 1 to entry: See Figure 7.Key1 porous bearing2 oil flowFigure 7 Porous self-lubricating bearing3.2.3.1
