1、BRITISH STANDARD AEROSPACE SERIES BS EN 3291:1994 Bearings, airframe rolling Single row self-aligning roller bearings in steel, cadmium plated Diameter series3 and4 Dimensions and loads The European Standard EN3291:1994 has the status of a BritishStandard UDC629.7.02:621.822.8.004.1:621.828:669.14:6
2、69.738BSEN3291:1994 This BritishStandard, having 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: Comm
3、ittee reference MCE/7 Draft for comment88/72196 DC ISBN 0 580 21893 7 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 Oesterreic
4、hisches Normungsinstitut Belgium Institut belge 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 o
5、f Iceland Ireland National Standards Authority 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 d
6、e Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom BritishStandards Institution Amendments issued since publication Amd. No. Date CommentsBSEN3291:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside
7、 front cover National foreword ii Foreword 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) Cro
8、ss-references Inside back cover Figure 1 5 Table 1 5BSEN3291:1994 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 EN3291:1994 Aerospace series Bearings, airframe rolling Sin
9、gle row self-aligning roller bearings in steel, cadmium plated Diameter series3 and4 Dimensions and loads, published by the European Committee for Standardization (CEN). EN3291 was produced as a result of international discussions in which the United Kingdom took an active part. A British Standard d
10、oes 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 document comprises a front cover, an in
11、side 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.EUROPEAN STANDARD NORME EUROPENNE
12、 EUROPISCHE NORM EN3291 May1994 UDC629.7.02:621.822.8.004.1:621.828:669.14:669.738 Descriptors: Aircraft industry, airframebearings, self-aligning bearings, roller bearings, steel, cadmium, dimensions, static loads English version Aerospace series Bearings, airframe rolling Single row self-aligning
13、roller bearings in steel, cadmium plated Diameter series3and4 Dimensions and loads Srie arospatiale Roulements pour structures daronefs Roulements en acier, cadmis, rotule, sur une range de rouleauxSries de diamtres3 et4 Dimensions et charges Luft- und Raumfahrt Flugwerklager Einreihige Tonnenlager
14、aus Stahl, verkadmet Durchmesserreihen3und4 Mae und Belastungen This European Standard was approved by CEN on1994-05-19. 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 withou
15、t any alteration. Up-to-date lists and 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 mad
16、e 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 versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
17、 Luxembourg, 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 Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No.
18、 EN3291:1994EEN3291:1994 BSI 01-2000 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of the
19、 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 the result was positive. This European Standard shall be given the status of a national standard, either by publication of an identica
20、l text or by endorsement, at the latest by November1994 and conflicting national standards shall be withdrawn at the latest by November1994. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, F
21、rance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.EN3291:1994 BSI 01-2000 3 1 Scope This standard specifies the characteristics of single row self-aligning roller bearings in steel 1) , cadmium plated, of diameter s
22、eries3 and4 2)designed to withstand only slow rotations, oscillations and/or swivelling under load. They are intended for use between fixed and moving parts of the aircraft structure and their control mechanisms. The airframe rolling bearings defined in this standard are used from54 C to+150 C. Howe
23、ver, 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), operational range54 C to+177 C (see EN3280), their field of application when lubricated wit
24、h 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 appropriate places in the text and the publications are listed hereafter. For dated references
25、, 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 publication referred to applies. ISO15, Rolling bearings Radial bearings Boundary dimensions Ge
26、neral plan. ISO1132, Rolling bearings Tolerances Definitions. EN2031, Steel FE-PL31 Hardened and tempered Bars Aerospace series 3) . EN2133, Cadmium plating of steels with maximum specified tensile strength equal to or less than1450MPa and copper and copper alloys Aerospace series 3) . EN2221, Steel
27、 FE-PL31 Hardened and tempered Hollow bars3,5mmk ak 55mm Aerospace 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. EN3292, Aerospace series Bearing
28、s, airframe rolling Single row self-aligning roller bearings in corrosion resisting steel Diameter series3 and4 Dimensions and loads. 3 Definition For the purposes of this standard, the following definition applies: bearing full complement of rollers (without cage) 4 Symbols The definitions of toler
29、ances and clearances are given in ISO1132. 1) For new design, use preferably bearings in corrosion resisting steel, see EN3292. 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 outsid
30、e diameter deviation % ds = deviation of a single bore diameter % Ds = deviation of a single outside diameter G a = axial internal clearance G r = radial internal clearance K ia = radial runout of assembled bearing inner ringEN3291:1994 4 BSI 01-2000 5 Required characteristics 5.1 Dimensions Toleran
31、ces Clearances Loads Mass Configuration: see Figure 1; the bearings are fitted with either seals or shields. Values: see Table 1; the dimensions and tolerances apply after protection. 5.2 Surface roughness Raceways and rolling elements: R a =0,24m Bore, side faces and cylindrical outer surface: R a
32、=0,84m The values apply prior to cadmium plating. 5.3 Materials 5.4 Surface treatment EN2133 thickness,54m to124m, on the inner and outer rings, the bore and raceways are not cadmium plated. As soon as possible after plating, and within16h de-embrittlement heat treatment shall be carried out at a te
33、mperature and for a time (compatible with the performance requirements of the bearing) which shall be subject to written approval of the qualifying authorities. K ea = radial runout of assembled bearing outer ring F amax. = permissible static axial load C s = permissible static radial load P or = st
34、atic equivalent radial load F a = bearing axial load, axial component of actual bearing load F r = bearing radial load, radial component of actual bearing load. Inner ring : EN2031 or EN2221 or EN2222,59HRC to64HRC Outer ring : EN2031 or EN2221 or EN2222,59HRC to64HRC Rollers : EN2031,59HRC to64HRC
35、Shields : Corrosion resisting material Seals : Polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE) reinforced with fibreglass.EN3291:1994 BSI 01-2000 5 Table 1 NOTEThe installation of seals and shields is at the manufacturers option. Figure 1 Dimensions in millimetres d B C D d1 min. F
36、max. a G max. a Tolerances 4m r Mass kg/1000 parts Code Nominal % % dmp % % Dmp % % ds % % Ds 08 8 17 14 30 14 14 24,9 0,3 to 0,8 58 10 10 21 17 35 15,7 18 28 91 12 12 37 18 30,7 106 15 15 42 21,8 35,5 132 17 17 23 19 47 25,1 19 39,3 186 20 20 26 21 52 28 22 44,8 0,3 to 1 246 25 25 29 24 62 34,5 25
37、53,3 397 30 30 34 27 72 41,3 30 63 610 0 0,12 0 0,12 0 8 0 9 +2 10 + 2 11 0 11 +3 14 +3 11 0 10 0 13 +3 13 +4 17EN3291:1994 6 BSI 01-2000Table 1 6 Designation EXAMPLE: NOTEIf necessary, the codeI9005 shall be placed between the description block and the identity block. 7 Marking In addition to the m
38、anufacturers 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 option. 8 Technical specification See EN3280. d Internal clearances 4m Runout tolerances radial max. 4m Starting torque bin mN.m Permissi
39、ble static loads ckN Axial max. G a Radial G r Code Special group Code R Group2 Code K Special group Code R Group2 Code K K ia K ea Code P Code E Axial F amax. Radial C s 08 190 230 2 to7 10 to20 25 40 7 11 11,1 36,7 10 10 15,5 16,3 53,9 12 200 240 3 to9 15 23 18,2 60,2 15 20 30 21,1 69,6 17 25 38 2
40、8,6 94,5 20 220 250 3 to10 30 45 34,3 113,2 25 240 290 15 to25 35 52 49 161,7 30 40 60 65,3 215,6 a Dimensions of the shields are at the manufacturers option within the limits of F and G. b Definition, see EN3280. c F r +3,3F a =P or; P orshall bek C s . For ultimate static loads, see EN3280.BSEN329
41、1:1994 BSI 01-2000 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee MCE/7 upon which the following bodies were represented: Bal
42、l 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 are as follows. International Standard Correspondi
43、ng BritishStandard ISO15:1981 BS6267:1982 Specification for rolling bearings: boundary dimensions for radial bearings ISO76:1987 BS5645:1987 Specification for static load ratings for rolling bearings ISO1132:1980 BS6107 Rolling bearings: tolerances Part1:1981 Glossary of termsBS EN 3291:1994 BSI 389
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