1、BRITISH STANDARD AEROSPACE SERIES BS EN 2079:1995 Bearings, precision ball with flange in corrosion resisting steel, for instruments and equipment Dimensionsand loads The European Standard EN 2079:1995 has the status of a British StandardBSEN2079:1995 This British Standard, having been prepared unde
2、r the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15April1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 88/76835 DC ISBN 0 580 23851 2 Committ
3、ees responsible for this BritishStandard The preparation of this British Standard was entrusted to Technical Committee ACE/14, Aerospace details and parts, upon which the following bodies were represented: Civil Aviation Authority Institute of Petroleum Ministry of Defence Society of British Aerospa
4、ce Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSEN2079:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Symbols 3 4 Required characteristics 4 5 Classification of bores and ou
5、tside diameters 8 6 Designation 9 7 Marking 9 8 Technical specification 9 Figure 1 4 Figure 2 5 Table 1 5 Table 2 6 Table 3 6 Table 4 6 Table 5 6 Table 6 7 Table 7 7 Table 8 7 Table 9 8 List of references Inside back coverBSEN2079:1995 ii BSI 01-2000 National foreword This British Standard has been
6、prepared under by Technical Committee ACE/14 and is the English language version of EN2079:1995 Aerospace series Bearings, precision ball with flange in corrosion resisting steel, for instruments and equipment Dimensions and loads, published by the European Committee for Standardization (CEN). EN 20
7、79:1995 was produced as a result of international discussions in which the UnitedKingdom took an active part. Cross-references The British Standards corresponding to the International Standards referred to in the text are as follows: There are no British Standards corresponding to EN2030 and EN2130
8、referred to in the text. British Standards identical in title and number will be published in due course. 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 Sta
9、ndard does not of itself confer immunity from legal obligations. Publication referred to Corresponding British Standard ISO 15:1981 BS 6267:1982 Specification for rolling bearings: boundary dimensions for radical bearings ISO 1132:1980 BS 6107 Rolling bearings: tolerances Part 1:1981 Glossary of ter
10、ms ISO 1224 BS 3469:1985 Specification for instrument precision rolling bearings (ball bearings) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to 10, an inside back cover and a back cover. This standard has been updated (see c
11、opyright 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 EN 2079 February 1995 ICS 49.040.30 Descriptors: Aircraft industry, aircraft instruments, precision bearings, ball bearin
12、gs, dimensions English version Aerospace series Bearings, precision ball with flange incorrosion resisting steel, for instruments and equipment Dimensions and loads Srie arospatiale Roulements billes de prcision avec collet en acier rsistant la corrosion pour instruments et quipements Dimensions et
13、charges Luft und Raumfahrt Przisionskugellager mit Flansch aus korrosionsbestndigem Sthl fur Instrumente und Gerte Mae und Belstungen This European Standard was approved by CEN on 1995-02-01. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
14、 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 to any CEN member. This European Standard exists in three official
15、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 versions. CEN members are the national standards bodies of Austria, Belgi
16、um, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassa
17、rt 36, B-1050 Brussels 1995 Copyright reserved to CEN members Ref. No. EN 2079:1995 EEN2079:1995 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
18、Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of ACEMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical
19、text of by endorsement, at the latest by August1995, and conflicting national standards shall be withdrawn at the latest by August1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France
20、, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.EN2079:1995 BSI 01-2000 3 1 Scope This standard specifies the required characteristics for precision ball bearings in corrosion resisting steel: with flange; with radial c
21、ontact; with deep groove; without filling slot; for use in instruments and aircraft equipment. 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 t
22、he 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 publication referred to applies. ISO
23、15, Rolling bearings Radial bearings Boundary dimensions General plan. ISO 1132, Rolling bearings Tolerances Definitions. ISO 1224, Rolling bearings Instrument precision bearings. EN 2030, Steel FE-PM43 Hardened and tempered Bars Dk 150mm Aerospace series 1) . EN 2130, Aerospace series Precision bal
24、l bearings in corrosion resisting steel for instruments and equipment Technical specification 2) . 3 Symbols The following symbols are in conformity with ISO1224. Definitions to ISO1132. 1) Published as AECMA Standard at the date of publication of the present standard 2) In preparation at the date o
25、f publication of the present standard d : Nominal bore diameter % ds : Deviation of a single bore diameter % dmp : Single plane mean bore diameter variation V dp : Bore diameter variation in a single radial plane V dmp : Mean bore diameter variation D : Nominal outside diameter % Ds : Deviation of a
26、 single outside diameter % Dmp : Single plane mean outside diameter deviation V Dp : Outside diameter variation in a single radial plane V Dmp : Mean outside diameter variation D 1 : Nominal outside diameter of the outer ring flange %D 1s : Deviation of a single outside diameter of the outer ring fl
27、ange B : Nominal width of the rings % Bs : Deviation of a single ring width V Bs : Variation in the width of the rings C 1 : Nominal outer ring flange width %C 1s : Deviation of a single outer ring flange width VC 1s : Outer ring flange width variation r smin. : Smallest single chamfer dimension r s
28、max. : Largest single chamfer dimension K ia : Radial runout of assembled bearing inner ring K ea : Radial runout of assembled bearing outer ring S d : Face runout with boreEN2079:1995 4 BSI 01-2000 4 Required characteristics 4.1 Materials Rings and balls: steel EN 2030; minimum hardness = 650 HV5 C
29、age, shields and circlips: corrosion resisting steel Seals: polytetrafluorethylene (PTFE) or PTFE plastic material reinforced with glass fibre 4.2 Dimensions Radial clearance Tolerances Loads Configuration: seeFigure 1 andFigure 2; the design and mounting of shields and seals (Figure 2) and the choi
30、ce of cage design are at the discretion of the manufacturer. Dimensions: seeTable 1. Clearances: seeTable 2 andTable 3. Tolerances: seeTable 4,Table 5,Table 6 andTable 7. Loads: seeTable 8. 4.3 Lubrication Esther type grease: code 1 Synthetic oil: code 2 For essential characteristics: see EN2130 4.4
31、 Surface roughness Closure type SeeFigure 1 andFigure 2. S d1 : Variation of bore generatrix inclination with face S D : Variation of outside surface generatrix inclination with face S ia : Assembled bearing inner ring face runout with raceway S ea : Assembled bearing outer ring face runout with rac
32、eway S ea1 : Assembled bearing outer ring flange back face runout with raceway Figure 1 EN2079:1995 BSI 01-2000 5 Table 1 Figure 2 Dimensions in millimetres Code d D B D 1 C 1 r smin. r smax. Series: a nom. nom. nom. nom. nom. radial axial diam. dimen. 154 1,5 4 2,0 5,0 0,6 0,05 0,10 0,10 8 38 155 1
33、,5 5 2,0 6,5 0,6 0,15 0,30 0,30 9 19 205 2,0 5 2,3 6,1 0,6 0,08 0,16 0,30 8 38 206 2,0 6 2,3 7,5 0,6 0,15 0,30 0,60 9 19 256 2,5 6 2,6 7,1 0,8 0,08 0,16 0,30 8 38 257 2,5 7 3,5 8,5 0,9 0,15 0,30 0,60 9 39 307 3,0 7 3,0 8,1 0,8 0,10 0,20 0,40 8 38 308 3,0 8 4,0 9,5 0,9 0,15 0,30 0,60 9 39 310 3,0 10
34、4,0 11,5 1,0 0,15 0,30 0,60 2 02 409 4,0 9 4,0 10,3 1,0 0,10 0,20 0,40 8 38 411 4,0 11 4,0 12,5 1,0 0,15 0,30 0,60 9 19 413 4,0 13 5,0 15,0 1,0 0,20 0,50 0,80 2 02 511 5,0 11 5,0 12,5 1,0 0,15 0,30 0,60 8 38 513 5,0 13 4,0 15,0 1,0 0,20 0,50 0,80 9 19 516 5,0 16 5,0 18,0 1,0 0,30 0,60 1,00 2 02 613
35、6,0 13 5,0 15,0 1,1 0,15 0,30 0,60 8 28 615 6,0 15 5,0 17,0 1,2 0,20 0,50 0,80 9 19 714 7,0 14 5,0 16,0 1,1 0,15 0,30 0,60 8 28 816 8,0 16 6,0 18,0 1,3 0,20 0,50 0,80 8 38 a Series conforming to ISO 15.EN2079:1995 6 BSI 01-2000 4.5 Normal internal radial clearance SeeTable 2. Table 2 4.6 Reduced int
36、ernal radial clearance SeeTable 3. Table 3 4.7 Tolerances group K Shall conform to those of class 5A from ISO1224. 4.7.1 Inner ring SeeTable 4. Table 4 NOTEThe tolerance of face runout with bore (S d ) may be obtained by the approximate formula: where F is the inner ring raceway diameter. F may be i
37、ndicated by each manufacturer or, when the ball diameter (D 2 ) is known, the following approximate value may be used for F. 4.7.2 Outer ring SeeTable 5. Table 5 4.8 Tolerances group L Shall conform to those of class 4A from ISO 1224. d nominal Clearance m mm Group A Group B Group C 1,5 to 8 0 to 6
38、4 to 11 10 to 20 d nominal Clearance m mm Group D Group E Group F Group G Group H Group J 1,5 to 8 1 to 5 4 to 8 7 to 11 10 to 15 14 to 20 18 to 28 d nominal Tolerances m mm % dmp % ds V dp max. V dmp max. % Bs V Bs max. K ia max. S d1 max. S ia max. 1,5 to 8 0 5 0 5 3 3 0 25 5 3,5 7 7 D nomina l To
39、lerances m Types MNPQ Type R B K ea S D S ea %D 1s %C 1s VC 1s S ea1 mm % Dmp % Ds V Dp max. V Dpm max. % Ds V Dp max. V Dmp max. % Bs V Bs max. max. max. max. max. 4 to 16 0 5 +1 6 5 5 0 5 3 3 0 25 5 5 8 8 0 25 0 50 5 10 S dmax.S d1max. F 2 B2 r smax. () - = F Dd + 2 -D 2 =EN2079:1995 BSI 01-2000 7
40、 4.8.1 Inner ring SeeTable 6. Table 6 NOTESee note on4.7.1. 4.8.2 Outer ring SeeTable 7. Table 7 4.9 Bearing types, load ratings and mass SeeTable 8. Table 8 d nominal Tolerances m mm % dmp % ds V dp max. V dmp max. % Bs V Bs max. K ia max. S d1 max. S ia max. 1,5 to 8 0 5 0 5 2,5 2,5 0 25 2,5 2,5 3
41、 3 D nomina l Tolerances m Types MNPQ Type R B K ea S D S ea %D 1s %C 1s VC 1s S ea1 mm % Dmp % Ds V Dp max. V Dpm max. % Ds V Dp max. V Dmp max. % Bs V Bs max. max. max. max. max. 4 to 16 0 5 +1 6 5 5 0 5 2,5 2,5 0 25 2,5 3,5 4 5 0 25 0 50 2,5 8 Code Types of bearing a Masse bg Dynamic radial load
42、rating min.N Basic static radial load rating N 154 R, P, Q 0,15 55 22 155 R, P, Q 0,26 88 36 205 R, P, Q 0,25 88 36 206 R, P, Q 0,39 120 54 256 R, P, Q 0,41 120 52 257 R, P, Q 0,78 120 62 307 R, P, Q 0,60 180 80 308 R, P, Q 1,10 240 120 310 R, M, N, P, Q 1,77 300 140 409 R, M, N, P, Q 1,22 240 120 4
43、11 R, M, N, P, Q 2,04 380 185 413 R, M, N, P, Q 3,66 540 270 511 R, M, N, P, Q 2,25 360 180 513 R, M, N, P, O 2,84 450 250 516 R, M, N, P, Q 5,42 620 340 613 R, M, N, P, Q 3,26 450 250 615 R, M, N, P, Q 4,56 620 340 714 R, M, N, P, Q 3,59 540 270 816 R, M, N, P, Q 5,53 790 370 a SeeFigure 1 andFigur
44、e 2. b Approximative mass calculated from the following formula: where M = approximate mass and $ = density of material.EN2079:1995 8 BSI 01-2000 5 Classification of bores and outside diameters When required for selective assembly to shafts and housings, instrument precision rolling bearings may be
45、classified into specific size groups in accordance with the following provisions. 5.1 Classification It shall be carried out prior to assembly of the seals or shields. The bore and outside diameter shall each be classified into two or four groups as shown inTable 9. Table 9 NOTEDue to difficulties i
46、n gauge correlation between manufacturer and user, the classifications shall be considered only as guides for selective assembly and not as absolute size segregations in borderline cases. Code numbers and/or letters shall be included in the identity block for this purpose. The classification code fo
47、r the bore shall always precede that of the outside diameter. Should classification not be required for one of the diameters, code T shall be substituted. If no classification is required, then the code TT shall be used. EXAMPLE 1: EXAMPLE 2: EXAMPLE 3: TT = Bore and outside diameter not classified.
48、 5.2 Method of size determination Bore diameter: the smallest diameter measured Outside diameter: the largest diameter measured Tolerance range Code Tolerance range Code p m p m 2.5k pk 0 5k pk2,5 1 2 1,25k pk 0 2,5k p 1,25 3,75k p 2,5 5k p 3,75 A B C D 1A = Range of tolerance of bore diameter : 2,5
49、mkpk0 Range of tolerance of outside diameter : 1,25mkpk0 CB = Range of tolerance of bore diameter : 3,75mkp 2,5m Range of tolerance of outside diameter : 2,5mkp 1,25mEN2079:1995 BSI 01-2000 9 6 Designation EXAMPLE: NOTEIf necessary, the code19005 shall be placed between the description block and the identity block. 7 Marking In addition to the manufacturers own marking, all packages shal
