ASD-STAN PREN 3281-1987 Aerospace Series Bearings-Airframe Rolling Rigid Single Row Ball Bearings in Steel Diameter Series 8 and 9 Dimensions Torques Clearances and Loads (Issue P .pdf

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1、I , , AECMA PREN3283 87 W 31132313 0005210 3 W . 14 th September 1987 A. E.C. M .A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM after the date of publication decision A.E.C.M.A. 88, Bd. Malesherbes Mr. MQUTARDE 75008 PARIS - FRANCE prE N 328 1 Issue P 1 September 1987 EDITE PAR LASSOCIATION EUROPENNE

2、DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TEL. 45-63-82-85 UDC : 629.7.02 : 621.822.74.004.1 : 669.14 Key words : Aircraft industry, airframe bearings, ball bearings, steel, dimensions, static loads ENGLISH VERSION Aerospace series Bearings-airframe rolling ri

3、gid, single row ball bearings in steel diameter series 8 and 9 Dimensions, torques, clearances and loads Srie arospatiale Luft- und Raumfahrt Roulements pour structures daronefs Flugwerklager roulements rigides une range de billes sries de diamtres 8 et 9 Dimensions, couples, jeux et charges einreih

4、ige Rillenkugellager Durchmesserreihen 8 und 9 Mae, Momente, Lagerluft und Belastungen en acier aus Stahl This .Aerospace Series. pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the n

5、eeds of AECMA-Members. It has been technically approved b y the experts of the concerned AECMA Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affectkd, physic

6、ally or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standard

7、ization) for final vote. 0 aecma 1987 _ _ . - ! AECMApPREN3281-8? 1012311 O005211 5 prEN3281 Page 2 Foreword The characteristics of the bearings covered by this standard are identical to those of EN2009 with regard to configuration, dimensions, tolerances, mass and loads. They differ from them by th

8、e addition of new characteristics : - starting torques ; - internal axial clearances ; - special group for the internal radial clearance. 1 Scope This standard specifies the characteristics of rigid single row ball bearings of diameter series 8 and 9 1) designed to withstand only slow rotations and

9、oscillations under load, I 4 Definition They are intended for use between fixed and moving parts of the aircraft structure and their control mechanisms, I Rigid bearings, full complement of balls (without cage), single row of- balls with filling slot. 2 Field of application The airframe rolling bear

10、ings defined in this standard shall be used from -54 to i-150 OC. However, being lubricated with the following greases : - very high pressure grease, ester type (code A), operational range -73 to i-121 OC or - very high pressure grease, synthetic hydrocarbons, general purpose (code B), operational r

11、ange -54 to +177 OC (refer to EN3280) ; their field of application when lubricated with code A grease shall be limited to 3.121 “C. 0 3 References IS0 15-1981, Rolling bearings - Radial bearings - Boundary dimensions - General plan IS0 1132-1980, Rolling bearings - Tolerances - Definitions EN2031, S

12、teel FE-PL31 - Hardened and tempered - Bars - Aerospace series EN2221, Steel FE-PL31 - Hardened and tempered - Hollow bars 3,5 mm a 55 mm - Aerospace series EN2222, Steel FE-PL31 - Hardened and tempered - Hand and die forgings - O Aerospace series EN3280, Bearings - airframe rolling - Technical spec

13、ification - Aerospace series 1) See IS0 15. O :AECMApPREN3283 87 W 30323L3 0005233 7 = prEN3281 Page 4 5 Symbols The definition of tolerances and of clearances are given in IS definition of loads in EN3280. dmp A *,mp CS = permissible static radial load Fa roux.= permissible static axial load = axi.

14、al internal clearance Ga GY = radial internal clearance = single plane mean bore diameter = single plane mean outside diameter 1132 and L = radial runcut of assembled bearing outer ring = radial runout of assembled bearing inner ring = assembled bearing outer ring face runout with raceway (groove) =

15、 assembled bearing inner ring face runout with raceway (groove) = coefficient of axial load Kea Kia Sea ia Y S 6 Required characteristics 6.1 Dimensions - Tolerances - Clearances - Loads - Mass Values : see table. Configuration : see figure ; the bearings can be assembled with either seals or shield

16、s. 6.2 Surface roughness Raceway and rolling elements : Ra = 0,2 pm Bore, side faces and cylindrical outer surface : Ra = 0,8 pm. 6.3 Materials Inner ring : Steel EN2031 or EN2221 or EN2222, 59 to 64 HRC i). Outer ring : Steel EN2031 or EN2221 or EN2222, 59 to 64 HRC i). Balls : Steel EN2031, 59 to

17、64 HRC 1). Shields : Corrosion resisting material. Seals : Polytetrafhoroethylene (PTFE) or polytetrafluoroethylene (PTFE), coated glass fabric material. 1) For new designs, bearings in corrosion resisting steel should be used preferably, see EN3283. a O internal clearances prEN3281 Page 5 Runout to

18、lerances Starting Permissible Mass max. pm torque i) static kg/ C 6 im 2 to 13 3 to 18 5 to 20 6 to 20 6 to 23 8 to 28 Bearing with shields - Code P radial- (Sial (Sea) dD 40 40 Detail W applicable to bore and outer surface 22,O I 29 I 31,8 The process for installation of seals and shields is at the

19、 manufacturers option, 38 Figure 1 32.0 I 47 I 43,l Tolerances 55 O -10 - O -12 - O -15 - - axial max. Ga - 100 - 120 150 - I) Definition : see EN3280 where Ys = 2,2 F max.= - CS Ys Axial and radial loads may be applied simultaneously. For ultimate static loads, see EN3280. I in-aN.m Iradial load I

20、IOO 25 II I Shields Seals 5,5 17,6 17.3 20 _- I AECMA PREN3281 87 m 1012311 0005215 2 m prEN3281 Page 6 7 Designation Each bearing shall only be designated as in the following example : Identity block I Description block BEARING A = Code for ester type ! grease Number of EN standard 10 = diameter co

21、de of d (see table) P = code for type with shields where the following codes are applied : Greases A = ester type grease B = synthetic hydrocarbon type grease E = with seals P = with shields Note : If necessary, the originator code S9005 may be introduced between the description block and the identi

22、ty block, 8 Marking In addition to the manufacturers own marking, each bearing shall be marked, on one side face only using the identity block as defined in clause 7 of this standard. Marking position and method are at the manufacturers option. 9 Technical specification Bearings supplied to this standard shall conform with the requirements of EN3280.