BS EN 1337-7-2004 Structural bearings — Part 7 Spherical and cylindrical PTFE bearings《结构轴承 球面和圆柱形聚四氟乙烯轴承》.pdf

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1、BRITISH STANDARDBS EN 1337-7:2004Structural bearings Part 7: Spherical and cylindrical PTFE bearingsThe European Standard EN 1337-7:2004 has the status of a British StandardICS 91.010.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g5

2、5g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 1337-7:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on

3、29 December 2006 BSI 2006ISBN 0 580 49852 2National forewordThis British Standard was published by BSI. It is the UK implementation of EN 1337-7:2004. It supersedes BS EN 1337-7:2001 which is withdrawn. It partially supersedes BS 5400-9-1:1983 and BS 5400-9-2:1983 which will remain current until the

4、 remaining parts of the BS EN 1337 series have been published, the last part being Part 8. The UK participation in its preparation was entrusted to Technical Committee B/522, Structural bearings.A list of organizations represented on B/522 can be obtained on request to its secretary.This publication

5、 does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Mon Mar 19

6、 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1337-7March 2004ICS 91.010.30 Supersedes EN 1337-7:2000English versionStructural bearings - Part 7: Spherical and cylindrical PTFEbearingsAppareils dappui structuraux - Partie 7: Appareils dappuicyl

7、indriques sphriques comportant du PTFELager im Bauwesen - Teil 7: Kalotten- und Zylinderlager mitPTFEThis European Standard was approved by CEN on 2 January 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard

8、the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German

9、). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark,

10、 Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES K

11、OMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1337-7:2004: ELicensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN

12、1337-7:2004 (E)2ContentspageForeword3Introduction .41 Scope 52 Normative references 53 Terms and definitions, symbols and abbreviations.54 Requirements .95 Material properties.96 Design requirements .97 Manufacturing, assembly and tolerances .128 Conformity evaluation .12Annex A (informative) Method

13、 for calculating the eccentricities in spherical and cylindrical PTFEbearings 13Annex B (informative) Reduced area for curved sliding surfaces .15Annex ZA (informative) Provisions for the CE marking of cylindrical and spherical PTFE bearings (withor without flat sliding elements) under the EU Constr

14、uction Products Directive.18Licensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)3ForewordThis document (EN 1337-7:2004) has been prepared by Technical Committee CEN /TC 167, “Structural bearings“,the secretariat of which is held by UNI.This Eu

15、ropean Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at thelatest by September 2004.This document has been prepared under a mandate given t

16、o CEN by the European Commission and the EuropeanFree Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.Annexes A and B are informative.This document supersedes EN 1337

17、-7:2000.This European Standard EN 1337 “Structural bearings”, consists of the following 11 Parts:Part 1: General design rulesPart 2: Sliding elementsPart 3: Elastomeric bearingsPart 4: Roller bearingsPart 5: Pot bearingsPart 6: Rocker bearingsPart 7: Spherical and cylindrical PTFE bearingsPart 8: Gu

18、ide bearings and restrain bearingsPart 9: ProtectionPart 10: Inspection and maintenancePart 11: Transport, storage and installationAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria,

19、 Belgium, Cyprus, Czech Republic, Denmark,Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.Licensed Copy: Wang Bin, na, Mon Mar 19

20、 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)4IntroductionThis standard considers a minimum operating temperature of 35C.An extension down to 40C will be considered in a future amendment.Applications beyond the range of temperature given in clause 1 need special consideratio

21、n not covered by thisstandard. Characteristics, requirements and test procedures given in this standard do not apply in such cases.Licensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)51 ScopeThis European Standard deals with the requirements f

22、or the design and manufacture of spherical and cylindricalPTFE bearings. The requirements and properties of the curved sliding surfaces are included in EN 1337-2.Spherical and cylindrical bearings with an included angle 2 q 60 and 2 q 75 respectively are beyond thescope of this European Standard. (s

23、ee Figure 6).For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements andguides according to EN 1337-2:2004 and restraining rings as per 6.3.4.Cylindrical bearings are susceptible to unexpected moments about the transverse axis of the cylindrical s

24、urface.Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004.2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate place

25、s in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred

26、to applies (including amendments).EN 1337-1:2000, Structural bearings - Part 1: General design rulesEN 13372:2004, Structural bearings - Part 2: Sliding elementsprEN 13375:1996, Structural bearings - Part 5: Pot bearings3 Terms and definitions, symbols and abbreviations3.1 Terms and definitionsFor t

27、he purposes of this European Standard, the following terms and definitions apply.3.1.1backing platemetallic component which supports sliding materials3.1.2cylindrical PTFE bearingbearing consisting of a backing plate with a convex cylindrical surface (rotational element) and a backing plate witha co

28、ncave cylindrical surface between which a PTFE sheet and the mating material form a curved sliding surface(see Figure 1). Cylindrical PTFE bearings are also used in combination with flat sliding elements and guides to formfree or guided bearings (see Figure 2)NOTE Numbers in brackets in Figures 1 an

29、d 2 refer to the examples shown in Figure 1 of EN 1337-1:2000.Licensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)6Keya) Fixed by end stops and sliding surface (7.1)b) Without end stops for displacements in y direction (7.2)Figure 1 Cylindrica

30、l PTFE bearingsKeya) Free for displacements in any direction (7.4)b) Guided by an internal guide for displacements in x direction (7.3)c) Guided by external guides for displacements in x directionFigure 2 Cylindrical PTFE bearings combined with flat sliding elements3.1.3guidesliding element which re

31、strains a sliding bearing from moving in one axis3.1.4lubricantspecial grease used to reduce the friction and wear in the sliding surfaces3.1.5mating surfacehard smooth metallic surface against which the PTFE slides3.1.6polytetrafluoroethylene (PTFE)thermoplastic material used for its low coefficien

32、t of frictionLicensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)73.1.7sliding materialsmaterials which form sliding surfaces3.1.8sliding surfacecombination of a pair of flat or curved surfaces of different materials which allow relative displ

33、acements3.1.9spherical PTFE bearingbearing consisting of a backing plate with a convex spherical surface (rotational element) and a backing plate witha concave spherical surface between which a PTFE sheet and the mating material form a curved sliding surface(see Figure 3)Spherical PTFE bearings are

34、also used in combination with flat sliding elements and guides to form free andguided bearings (see Figures 4 a) to 4 c). Spherical PTFE bearings combined with a flat sliding element can beused together with a restraining ring to form fixed bearings (see Figure 4 d)NOTE 1 Numbers in brackets in Figu

35、res 3 and 4 refer to the examples shown in Figure 1 of EN 1337-1:2000.NOTE 2 Fixed by sliding surface (3.2).Figure 3 Spherical PTFE bearingKeya) Free for displacements in any direction (3.5)b) Guided by an internal guide for displacements in one direction (3.4)c) Guided by external guides for displa

36、cements in one direction (3.3)d) Fixed by a restraining ring (3.1)Figure 4 Spherical PTFE bearings combined with flat sliding elementsLicensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)83.2 SymbolsThe most frequently occurring symbols are def

37、ined below. Those that are local, and unique to a particular clause,are defined at their first appearance.3.2.1 Latin upper case lettersA contact area of sliding surface; projected area of the curved sliding surface mm2L diameter or diagonal of the projected area of the PTFE sheet .mmFigure 5 Plan d

38、imensions of spherical and cylindrical bearingsN axial or normal force N; kNV lateral or shear force . N; kN3.2.2 Latin lower case lettersa minor side of the projection in plan of cylindrical PTFE surfaces mmb major side of the projection in plan of cyclindrical PTFE surfaces;distance from the proje

39、cted area of the curved sliding surface mmc dimension mmd diameter . mme eccentricity . mmf nominal compressive strength . N/mm2h protrusion of PTFE sheet from its recess . mmr radius of curvature mmt thickness mmx longitudinal axisy transverse axisz axis normal to the principal bearing surface3.2.3

40、 Greek lettersa rotation angle. radiansLicensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)9b deviation angle from vertical axis of the line of action of theapplied load. degrees, radiansD z maximum deviation of plane or curved sliding surface

41、s fromtheoretical surface mmq half included angle of PTFE curved surfaces . degrees, radiansl ratio, coefficientm coefficient of frictions normal pressure . N/mm23.2.4 Subscriptsb backing plated design valuemin minimumpPTFES internal forces and moments from actionsttotal3.3 AbbreviationsPTFE Polytet

42、rafluoroethyleneNDP Nationally Determined Parameters4 Requirements4.1 GeneralCylindrical PTFE bearings shall permit rotational movements about one axis, spherical PTFE bearings about anyaxis. They shall be capable of transferring specified forces between superstructure and substructure.4.2 Requireme

43、nts for load bearing capacityThe curved PTFE sheet shall meet the requirements given in 6.2.1 to 6.2.3 and the backing plate with concavesurface those given in 6.3.3.4.3 Requirements for rotation capabilityThe sliding surfaces shall meet the requirements given in 6.2.4 and clause 4 of EN 1337-2:2004

44、.5 Material propertiesThe materials to be used and the properties to be verified shall be in accordance with clause 5 of EN 1337-2:2004.6 Design requirementsNOTE This clause gives requirements for the design of components which are specific to spherical and cylindrical bearingsand which are in addit

45、ion to those given in clause 6 of EN 1337-2:2004.Licensed Copy: Wang Bin, na, Mon Mar 19 02:38:36 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1337-7:2004 (E)106.1 Design principlesFor design calculations the principles given in clause 5 of EN 1337-1:2000 shall be taken into account.NOTE The design

46、values of internal forces and moments as well as of movements should be available from a bearingschedule as shown in annex B of EN 1337-1:2000.6.2 Design verification for curved sliding surfaces6.2.1 GeneralFor the purpose of verifications as per 6.2.2 and 6.2.3 the curved sliding surface shall be r

47、eplaced by its projectionon a plane surface as shown in Figure 6.Key1 Projected areaFigure 6 Verification scheme for the curved sliding surface (example)Internal forces and moments acting on the curved sliding surface due to frictional resistance, externally appliedhorizontal loads and the rotated c

48、ondition of the bearing shall be taken into account when determining the resultingtotal eccentricity et of the axial force NS.Secondary effects due to the action of the restraints shall also be considered.NOTE In annex A of this standard, formulae are given for the evaluation of the eccentricities i

49、n the most common cases.The frictional resistance shall be determined using the coefficients of friction given in Table 11 of EN 1337-2:2004.6.2.2 Separation of sliding surfacesNOTE Separation of the sliding surfaces may lead to wear due to contamination and increased deformation due to lack ofconfinement. As this could endanger long term fitness for use, the condition sp= 0 is considered as serviceability limit state.It shall be verified that sp 0 under the characteristic combination of actions. In doing so the sliding material shallbe assumed to be linea