1、BRITISH STANDARD AEROSPACE SERIES BS EN 2020:1989 Specification for Bearings-airframe rolling single row self aligning roller bearings in corrosion resisting steel diameter series 3 and 4 Dimensions and loads This European Standard EN 2020 has the status of a British Standard. UDC 629.7.02:621.822.8
2、.004.1:621.828:669.14.018.89BSEN2020:1989 This British Standard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 29September1989 BSI 12-1999 The following BSI references relate to the work
3、 on this standard: Committee reference MCE/7 Draft for comment 76/74662DC ISBN 0 580 17653 3 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western Euro
4、pean countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Sta
5、ndardization Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus de Qualidade Spain Instituto Espaol de Normalizacin Sweden Standardiseringskommis
6、sionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date of issue CommentsBSEN2020:1989 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2
7、 Text of EN 2020 3 National appendix A Inside back cover National appendix B Inside back coverBSEN2020:1989 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN2020 “Bearings
8、-airframe rolling single row self aligning roller bearings in corrosion resisting steel diameter series3 and4. Dimensions and loads. Aerospace series”, published by the European Committee for Standardization (CEN). EN2020 was produced as a result of international discussion in which the UK took an a
9、ctive part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This documen
10、t comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.E
11、UROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2020 June 1984 UDC 629.7.02:621.822.8.004.1:621.828:669.14.018.89 Key words: Aircraft industry, airframe bearings, self aligning bearings, roller bearings, corrosion resisting steel, dimensions, staticloads English version Bearings-airframe rolling
12、 single row self aligning roller bearings in corrosion resisting steel diameter series3 and4 Dimensions and loads Aerospace series Roulements pour structures daronefs roulements en acier rsistant la corrosion rotule sur une range de rouleaux sries de diamtres3 et4 Dimensions et charges Sriearospatia
13、le Luft- und Raumfahrt Flugwerklager einreihige Tonnenlager aus Korrosionsbestndigem Stahl Durchmesserreihen3 und4 Masze und Belastungen This European Standard was accepted by CEN on1984-06-21. CEN members are bound to comply with the requirements of CEN Internal Regulations which stipulate the cond
14、itions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in t
15、hree official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizati
16、ons of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stass
17、art 36, B-1050 Brussels CEN 1984 Copyright reserved to all CEN members Ref. No. EN2020:1984EEN2020:1984 BSI 12-1999 2 Brief history This European Standard has been prepared by the European Association of Aerospace Constructors (AECMA). This Standard has been accepted by the European Committee for St
18、andardization (CEN) after inquiries and votes carried out in accordance with the rules of this Committee. Contents Page Brief history 2 1 Scope 3 2 Fields of application 3 3 References 3 4 Definitions 3 5 Symbols 3 6 Materials 3 7 Required characteristics 4 8 Designation 5 9 Marking 5 10 Technical s
19、pecification 6 Figure 4 Table 5EN2020:1984 BSI 12-1999 3 1 Scope This standard specifies the characteristics, of rigid single row ball bearings of diameter series3 and4 1)designed to withstand only slow rotations and oscillations under load. They are intended for use between fixed and moving parts o
20、f the aircraft structure and their control mechanisms. 2 Fields of application The airframe roller bearings defined in the present standard shall be used from54 to+150 C. However, being lubricated with the following greases: very high pressure grease, ester type (code A), operational range73 to+121
21、C or very high pressure grease, synthetic hydrocarbons, general purpose (code B), operational range54to+177 C (refer to EN2063), their field of application when lubricated with code A grease shall be limited to+121 C. 3 References ISO 15:1981, Rolling bearings Radial bearings Boundary dimensions Gen
22、eral plan. EN 2030, Steel FE-PL43 Hardened and tempered, Bars, Du 150mm. EN 2063, Bearings, airframe rolling Technical Specification. 4 Definitions Self aligning roller bearings, full complement (without cage), single row. 5 Symbols 6 Materials Inner ring: Steel EN2030, W 58HRC. Outer ring: Steel EN
23、2030, W 58HRC. Rollers: Steel EN2030, W 58HRC. Shields: Corrosion resisting material Seals: Polytetrafluoroethylene (PTFE); or polytetrafluoroethylene (PTFE) glass fibre reinforced plastic material. 1) See ISO15. % ds = the deviation of a single bore diameter % Ds = the deviation of a single outside
24、 diameter % dmp = single plane mean bore diameter deviation % Dmp = single plane mean outside diameter deviation C s = permissible static radial load F a = bearing axial load = axial component of actual bearing load F a max. = permissible static axial load F r = static radial load P or = static equi
25、valent radial load Y s = coefficient of axial load.EN2020:1984 4 BSI 12-1999 7 Required characteristics 7.1 Dimensions Tolerances Clearances Loads Mass Configuration shall correspond with theFigure. Dimensions shall correspond with theTable. Bearings can be assembled with either seals or shields. 7.
26、2 Surface roughness Ra=0,24m for the raceway and rolling elements. Ra=0,84m for the bore side faces and cylindrical outer surface. Figure EN2020:1984 BSI 12-1999 5 Table 8 Designation Each bearing shall only be designated as in the following example: where the following codes are applied: NOTEIf nec
27、essary, the originator codeS9005 may be introduced between the description block and the identity block. 9 Marking In addition to the manufacturers own marking, each bearing shall be marked, on one side face only using the identity block as defined inclause8 of this standard. Marking position and me
28、thod are at the manufacturers option. Dimensions in millimetres d D C 0 0,12 B 0 0,12 d 1 nom. Tolerances m r Radial internal clearanc e m Permissible static radial load C s kN Mass kg/1 000 parts . Code nominal % dmp % Dmp % ds % Ds 08 8 30 14 17 14 0 9 +2 10 +2 11 36,7 58 10 10 35 15,7 0 8 0,3 to
29、0,8 53,9 91 12 12 37 17 21 18 0 11 +3 14 10 to 20 60,2 106 15 15 42 21,8 +3 11 69,6 132 17 17 47 19 23 25,1 94,5 186 20 20 52 21 26 28 0 10 0 13 +3 13 +4 17 0,3 to 1 15 to 25 113,2 246 25 25 62 24 29 34,5 161,7 397 30 30 72 27 34 41,3 215,6 610 F a max.=where Y s =3,3 Equivalent static radial load P
30、 or . Load P orresulting from radial and axial loads is calculated according to formula P or =F r +3,3F aand shall be less than or equal to load C sgiven in theTable, see EN2063. For ultimate static loads, see EN2063. Greases A = ester type grease B = synthetic hydrocarbon type grease Types E = with
31、 seals P = with shields C s Y s -EN2020:1984 6 BSI 12-1999 10 Technical specification Bearings supplied to this standard shall conform with the requirements of EN2063.BSEN2020:1989 BSI 12-1999 National appendix A The United Kingdom participation in the preparation of this European Standard was entru
32、sted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee MCE/7 upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute Ball and Roller Bearing Manufacturers Association Engineering Equipment and Materials Users Association Institu
33、tion of Production Engineers Ministry of Defence North East Coast Institution of Engineers and Shipbuilders Society of British Aerospace Companies Limited National appendix B The British Standards corresponding to the European and International Standards referred to in the text are identical in numb
34、er and title with those given inclause3 with the exception of ISO15 for which the corresponding British Standard is BS6267:1982 (content identical).BS EN 2020:1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing B
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