1、BRITISH STANDARD AEROSPACE SERIES BS EN 3281:1994 Bearings, airframe rolling Rigidsinglerow ball bearings in steel Diameter series8 and9 Dimensionsand loads The European Standard EN3281:1994 has the status of a BritishStandard UDC 629.7.02:621.833.74.004.1:669.14BSEN3281:1994 This BritishStandard, h
2、aving been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15August1994 BSI01-2000 The following BSI references relate to the work on this standard: Committee referenceMCE/7 Draft for comment93/70
3、5034DC ISBN 0 580 21886 4 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut be
4、lge de normalisation Denmark Dansk Standard Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authori
5、ty of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standar
6、diseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN3281:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword
7、2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Symbols 3 5 Required characteristics 4 6 Designation 6 7 Marking 6 8 Technical specification 6 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back cover Figure 1 4
8、Table 1 5BSEN3281:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN3281:1994 Aerospace series Bearings, airframe rolling Rigid single row ball bearings in steel Diamet
9、er series8 and9 Dimensions and loads, published by the European Committee for Standardization (CEN). EN3281 was produced as a result of international discussions in which the UnitedKingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract.
10、 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 document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an insid
11、e 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN3281 June1994 UDC 629.7.02:621.833.74.004.1:669.14
12、Descriptors: Aircraft industry, airframe bearings, ball bearings, steel, dimensions, static loads English version Aerospace series Bearings, airframe rolling Rigidsingle row ball bearings in steel Diameterseries8and9 Dimensions and loads Srie arospatiale Roulements pour structures daronefs Roulement
13、s en acier, rigides, une range de billes Sries de diamtres8 et9 Dimensions et charges Luft- und Raumfahrt Flugwerklager Einreihige Rillenkugellager aus Stahl Durchmesserreihen8 und9 Mae und Belastungen This European Standard was approved by CEN on1994-06-07. CEN members are bound to comply with the
14、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 and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or
15、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 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versio
16、ns. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation
17、 Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994Copyright reserved to CEN members Ref. No.3281:1994EEN3281:1994 BSI 01-2000 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries
18、 and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This standard was submitted for formal vote, and th
19、e result was positive. 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 December1994, and conflicting national standards shall be withdrawn at the latest by December1994. According to the CEN/CENEL
20、EC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.EN3281:1994 BSI 01-2000 3 1 Scope
21、 This standard specifies the characteristics of rigid single row ball bearings in steel 1)of diameter series8 and9 2)designed to withstand only slow rotations and oscillations under load. They are intended for use between fixed and moving parts of the aircraft structure and their control mechanisms.
22、 The airframe rolling bearings defined in this standard are used from54 C to+150 C. However, being lubricated with the following greases: very high pressure grease, ester type (code A), operational range73 C to+121 C or very high pressure grease, synthetic hydrocarbons, general purpose (code B), ope
23、rational range54 C to+177 C (see EN3280), their field of application when lubricated with code A grease is limited to+121 C. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the approp
24、riate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any 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 publica
25、tion referred to applies. ISO15, Rolling bearings Radial bearings Boundary dimensions General plan. ISO1132, Rolling bearings Tolerances Definitions. EN2031, Steel FE-PL31 Hardened and tempered Bars Aerospace series 3) . EN2221, Steel FE-PL31 Hardened and tempered Hollow bars3,5mmk ak 55mm Aerospace
26、 series 3) . EN2222, Steel FE-PL31 Hardened and tempered Hand and die forgings Aerospace series 3) . EN3280, Aerospace series Bearings, airframe rolling, rigid or self-aligning Technical specification. EN3283, Aerospace series Bearings, airframe rolling Rigid single row ball bearings in corrosion re
27、sisting steel Diameter series8 and9 Dimensions and loads. 3 Definition For the purposes of this standard, the following definition applies: bearing full complement of balls (without cage), with filling slot 4 Symbols The definitions of tolerances and clearances are given in ISO1132. 1) For new desig
28、n, use preferably bearings in corrosion resisting steel, see EN3283 2) See ISO15 3) Published as AECMA Standard at the date of publication of this standard % dmp = single plane mean bore diameter deviation % Dmp = single plane mean outside diameter deviation G a = axial internal clearance G r = radi
29、al internal clearance S ia = assembled bearing inner ring face runout with raceway S ea = assembled bearing outer ring face runout with raceway K ia = radial runout of assembled bearing inner ring K ea = radial runout of assembled bearing outer ring F a max. = permissible static axial load C s = per
30、missible static radial load.EN3281:1994 4 BSI 01-2000 5 Required characteristics 5.1 Dimensions Tolerances Clearances Loads Mass Configuration: see Figure 1; the bearings are fitted with either seals or shields. Values: see Table 1. 5.2 Surface roughness Raceways and rolling elements: R a =0,24m Bor
31、e, side faces and cylindrical outer surface: R a =0,84m. 5.3 Materials Inner ring : EN2031 or EN2221 or EN2222,59HRC to64HRC Outer ring : EN2031 or EN2221 or EN2222,59HRC to64HRC Balls : EN2031,59HRC to64HRC Shields : Corrosion resisting material Seals : Polytetrafluoroethylene (PTFE) or polytetrafl
32、uoroethylene (PTFE) reinforced with fibreglass. NOTE 1The installation of seals and shields is at the manufacturers option. NOTE 2The shields shall not extend beyond B. Figure 1 EN3281:1994 BSI 01-2000 5 Table 1 Table 1 Dimensions in millimetres d B D d1 min. Tolerances 4m r Mass kg/1000 parts . Cod
33、e Nominal % dmp % Dmp 10 10 6 22 13 0,3 to 0,8 11 12 12 24 15 13 15 15 7 28 17,6 16 17 17 30 19,6 18 20 20 32 23 20 25 25 37 28,1 23 30 30 42 33,1 26 35 35 47 38,3 30 40 40 52 43,3 38 50 50 65 53 55 60 60 10 78 63,5 100 d Internal clearances 4m Runout tolerances max. 4m Starting torque ainmN.m Permi
34、ssible static loads b kN Code Axial max. Radial Axial Radial Code Code Axial Radial G a G r S ia S ea K ia K ea P E F a max. C s 10 100 2 to13 40 40 25 40 4,5 12 4,8 10,6 12 3 to18 5 13 5,6 12,3 15 5,5 14 7,4 16,2 17 6 15 8 17,6 20 5 to20 6,5 16 7,9 17,3 25 8,5 18 9,8 21,5 30 14 20 11,1 24,5 35 6 to
35、20 18 23 12,9 28,4 40 22 29 14,5 31,8 50 120 6 to23 32 47 19,6 43,1 60 150 8 to28 55 77 31,8 70 a Definition, see EN3280. b Axial and radial loads may be applied simultaneously. For ultimate static loads, see EN3280. 0 0,12 0 8 0 9 0 10 0 11 0 12 0 13 0 15EN3281:1994 6 BSI 01-2000 6 Designation EXAM
36、PLE: NOTEIf necessary, the codeI9005 shall be placed between the description block and the identity block. 7 Marking In addition to the manufacturers own marking, each bearing shall be marked, on one side face only, using the identity block, see6. Marking position and method are at the manufacturers
37、 option. 8 Technical specification See EN3280.BSEN3281:1994 BSI 01-2000 National annex NA (informative) Committees responsible The UnitedKingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical CommitteeMCE/7 up
38、on which the following bodies were represented: Ball and Roller Bearing Manufacturers Association Ministry of Defence Society of British Aerospace Companies Ltd. National annex NB (informative) Cross-references The BritishStandards corresponding to the International Standards referred to in the text
39、 are as follows. International Standard Corresponding British Standard ISO15:1981 BS6267:1982 Specification for rolling bearings: boundary dimensions for radialbearings ISO1132:1980 BS6107 Rolling bearings: tolerances Part1:1981 Glossary of termsBS EN 3281:1994 BSI 389 Chiswick High Road London W4 4
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