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1、BRITISH STANDARD BS EN 1337-7:2004 Structural bearings Part 7: Spherical and cylindrical PTFE bearings The European Standard EN 1337-7:2004 has the status of a British Standard ICS 91.010.30 ? Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 20
2、06, Uncontrolled Copy, (c) BSI BS EN 1337-7:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49852 2 National foreword This British Standard was published by BSI. It is the UK implementation of EN 1337
3、-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 It supersedes BS EN 1337-7:2001 which is withdrawn.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 remaining parts of the BS EN 1337 series have been published, the last part being Part 8. The UK participation in its preparation was entrust
4、ed 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 does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with
5、a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EURO
6、PISCHE NORM EN 1337-7 March 2004 ICS 91.010.30Supersedes EN 1337-7:2000 English version Structural bearings - Part 7: Spherical and cylindrical PTFE bearings Appareils dappui structuraux - Partie 7: Appareils dappui cylindriques sphriques comportant du PTFE Lager im Bauwesen - Teil 7: Kalotten- und
7、Zylinderlager mit PTFE This 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 European Standard the status of a national standard without any alteration. Up-to-date lists a
8、nd bibliographical references concerning such national standards 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). A version in any other language made by translation under the responsib
9、ility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
10、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Br
11、ussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1337-7:2004: E Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E)
12、2 Contents page Foreword3 Introduction.4 1Scope 5 2Normative references 5 3Terms and definitions, symbols and abbreviations.5 4Requirements.9 5Material properties.9 6Design requirements .9 7Manufacturing, assembly and tolerances.12 8Conformity evaluation.12 Annex A (informative) Method for calculati
13、ng the eccentricities in spherical and cylindrical PTFE bearings13 Annex B (informative) Reduced area for curved sliding surfaces .15 Annex ZA (informative) Provisions for the CE marking of cylindrical and spherical PTFE bearings (with or without flat sliding elements) under the EU Construction Prod
14、ucts Directive.18 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 3 Foreword This document (EN 1337-7:2004) has been prepared by Technical Committee CEN /TC 167, “Structural bearings“, the se
15、cretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at the latest by September 2004. This docum
16、ent has been prepared under a mandate given to CEN by the European Commission and the European Free 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
17、are informative. This document supersedes EN 1337-7:2000. This European Standard EN 1337 “Structural bearings”, consists of the following 11 Parts: Part 1: General design rules Part 2: Sliding elements Part 3: Elastomeric bearings Part 4: Roller bearings Part 5: Pot bearings Part 6: Rocker bearings
18、Part 7: Spherical and cylindrical PTFE bearings Part 8: Guide bearings and restrain bearings Part 9: Protection Part 10: Inspection and maintenance Part 11: Transport, storage and installation According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following co
19、untries are bound to implement this European Standard: Austria, 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, Switz
20、erland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 4 Introduction This standard considers a minimum operating temperature of 35C. An extension down to 40C will be cons
21、idered in a future amendment. Applications beyond the range of temperature given in clause 1 need special consideration not covered by this standard. Characteristics, requirements and test procedures given in this standard do not apply in such cases. Licensed Copy: London South Bank University, Lond
22、on South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 5 1 Scope This European Standard deals with the requirements for the design and manufacture of spherical and cylindrical PTFE bearings. The requirements and properties of the curved sliding su
23、rfaces are included in EN 1337-2. Spherical and cylindrical bearings with an included angle 2 60 and 2 75 respectively are beyond the scope of this European Standard. (see Figure 6). For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements and guid
24、es 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 surface. Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004. 2 Normative
25、references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
26、of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1337-1:2000, Structural bearings - Part 1: General design rules EN 13372:2004, Stru
27、ctural bearings - Part 2: Sliding elements prEN 13375:1996, Structural bearings - Part 5: Pot bearings 3 Terms and definitions, symbols and abbreviations 3.1 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1.1 backing plate metallic comp
28、onent which supports sliding materials 3.1.2 cylindrical PTFE bearing bearing consisting of a backing plate with a convex cylindrical surface (rotational element) and a backing plate with a concave cylindrical surface between which a PTFE sheet and the mating material form a curved sliding surface (
29、see Figure 1). Cylindrical PTFE bearings are also used in combination with flat sliding elements and guides to form free or guided bearings (see Figure 2) NOTENumbers in brackets in Figures 1 and 2 refer to the examples shown in Figure 1 of EN 1337-1:2000. Licensed Copy: London South Bank University
30、, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 6 Key a) Fixed by end stops and sliding surface (7.1) b) Without end stops for displacements in y direction (7.2) Figure 1 Cylindrical PTFE bearings Key a) Free for displacements in any
31、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 direction Figure 2 Cylindrical PTFE bearings combined with flat sliding elements 3.1.3 guide sliding element which restrains a sliding bearing from moving in one
32、axis 3.1.4 lubricant special grease used to reduce the friction and wear in the sliding surfaces 3.1.5 mating surface hard smooth metallic surface against which the PTFE slides 3.1.6 polytetrafluoroethylene (PTFE) thermoplastic material used for its low coefficient of friction Licensed Copy: London
33、South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 7 3.1.7 sliding materials materials which form sliding surfaces 3.1.8 sliding surface combination of a pair of flat or curved surfaces of different materials which a
34、llow relative displacements 3.1.9 spherical PTFE bearing bearing consisting of a backing plate with a convex spherical surface (rotational element) and a backing plate with a concave spherical surface between which a PTFE sheet and the mating material form a curved sliding surface (see Figure 3) Sph
35、erical PTFE bearings are also used in combination with flat sliding elements and guides to form free and guided bearings (see Figures 4 a) to 4 c). Spherical PTFE bearings combined with a flat sliding element can be used together with a restraining ring to form fixed bearings (see Figure 4 d) NOTE 1
36、Numbers in brackets in Figures 3 and 4 refer to the examples shown in Figure 1 of EN 1337-1:2000. NOTE 2Fixed by sliding surface (3.2). Figure 3 Spherical PTFE bearing Key a) Free for displacements in any direction (3.5) b) Guided by an internal guide for displacements in one direction (3.4) c) Guid
37、ed by external guides for displacements in one direction (3.3) d) Fixed by a restraining ring (3.1) Figure 4 Spherical PTFE bearings combined with flat sliding elements Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (
38、c) BSI EN 1337-7:2004 (E) 8 3.2 Symbols The most frequently occurring symbols are defined below. Those that are local, and unique to a particular clause, are defined at their first appearance. 3.2.1 Latin upper case letters Acontact area of sliding surface; projected area of the curved sliding surfa
39、cemm2 Ldiameter or diagonal of the projected area of the PTFE sheet .mm Figure 5 Plan dimensions of spherical and cylindrical bearings Naxial or normal force N; kN Vlateral or shear force . N; kN 3.2.2 Latin lower case letters aminor side of the projection in plan of cylindrical PTFE surfaces mm bma
40、jor side of the projection in plan of cyclindrical PTFE surfaces; distance from the projected area of the curved sliding surface mm cdimension mm ddiameter . mm eeccentricity . mm fnominal compressive strength . N/mm2 hprotrusion of PTFE sheet from its recess . mm rradius of curvature mm tthickness
41、mm xlongitudinal axis ytransverse axis zaxis normal to the principal bearing surface 3.2.3 Greek letters rotation angle.radians Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 9 deviation ang
42、le from vertical axis of the line of action of the applied load. degrees, radians zmaximum deviation of plane or curved sliding surfaces from theoretical surface mm half included angle of PTFE curved surfaces . degrees, radians ratio, coefficient coefficient of friction normal pressure . N/mm2 3.2.4
43、 Subscripts bbacking plate ddesign value minminimum pPTFE Sinternal forces and moments from actions ttotal 3.3 Abbreviations PTFEPolytetrafluoroethylene NDPNationally Determined Parameters 4 Requirements 4.1 General Cylindrical PTFE bearings shall permit rotational movements about one axis, spherica
44、l PTFE bearings about any axis. They shall be capable of transferring specified forces between superstructure and substructure. 4.2 Requirements for load bearing capacity The curved PTFE sheet shall meet the requirements given in 6.2.1 to 6.2.3 and the backing plate with concave surface those given
45、in 6.3.3. 4.3 Requirements for rotation capability The sliding surfaces shall meet the requirements given in 6.2.4 and clause 4 of EN 1337-2:2004. 5 Material properties The materials to be used and the properties to be verified shall be in accordance with clause 5 of EN 1337-2:2004. 6 Design require
46、ments NOTEThis clause gives requirements for the design of components which are specific to spherical and cylindrical bearings and which are in addition to those given in clause 6 of EN 1337-2:2004. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 30 06:34:12 GMT+00
47、:00 2006, Uncontrolled Copy, (c) BSI EN 1337-7:2004 (E) 10 6.1 Design principles For design calculations the principles given in clause 5 of EN 1337-1:2000 shall be taken into account. NOTEThe design values of internal forces and moments as well as of movements should be available from a bearing sch
48、edule as shown in annex B of EN 1337-1:2000. 6.2 Design verification for curved sliding surfaces 6.2.1 General For the purpose of verifications as per 6.2.2 and 6.2.3 the curved sliding surface shall be replaced by its projection on a plane surface as shown in Figure 6. Key 1Projected area Figure 6
49、Verification scheme for the curved sliding surface (example) Internal forces and moments acting on the curved sliding surface due to frictional resistance, externally applied horizontal loads and the rotated condition of the bearing shall be taken into account when determining the resulting total eccentricity et of the axial force NS. Secondary effects due to the action of the restraints shall also be considered. NOTEIn annex A of this standard, formulae are given for the ev
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