1、A.E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM Edition approved for publication 14 th September 1987 prEN3287 issue P 1 September 1987 Comments should be sent within six months CI Chairman after the date of publication decision 88, Bd. Malesherbes A.E.C.M.A. Mr. MOUTARDE 75908 PARIS - FRANCE D
2、ITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TEL. 45-63-82-85 UDC : 629.7.02 : 681 A322.7.004.2 : 681.828 : 669.14 Key words : Aircraft industry, airframe bearings, self-aligning bearings, ball bearings, steel, dimensions, static loa
3、ds ENGLISH VERSION Aerospace series Bearings-airframe rolling double row, self-aligning ball bearings in steel diameter series 2 Dimensions, torques, clearances and loads Srie arospatiale Luft- und Raumfahrt Roulements pour structures daronefs Flugwerklager roulements rotule sur deux ranges de bille
4、s sries de diamtres 2 Dimensions, couples, jeux et charges zweireihige Pendelkugellager Durchmesserreihe 2 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 Ma
5、triel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by 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 change
6、d to an extent that interchangeability is affected, physically 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 wil be submitted as a draft
7、European Standard to CEN (European Committee for Standardization) for final vote. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECIA PREN3287 87 m 1
8、012311 0005248 b E prEN3287 Page 2 Foreword The characteristics of the bearings covered by this standard are identical to those of EN2015 with regard to configuration, dimensions, tolerances, mass and loads. They differ from them by the addition of new characteristics : - starting torques ; - intern
9、al axial clearances ; - special group for the internal radial clearance ; - runout tolerances (transferred from the technical specification). Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking
10、permitted without license from IHS-,-,-1 Scope This standard specifies the characteristics of double row self aligning ball bearings of diameter series 2 1) designed to withstand only slow rotations and oscillations under load. O They are intended for use between fixed and moving parts of the aircra
11、ft structure and their control mechanisms, 2 Field of application The airframe rolling bearings defined in this standard shall be used from -54 to +150 OC. However, being lubricated with the following greases : - very high pressure grease, ester type (code A), operational range -73 to +121 C or - ve
12、ry high pressure grease, synthetic hydrocarbons, general purpose (code B), operational range -54 to +177 OC (refer to EN3280) ; O their field of application when lubricated with code A grease shall be limited to +121 Oc. 3 References IS0 15-1981, Rolling bearings - Radial bearings - Boundary dimensi
13、ons - General plan IS0 1132-1980, Rolling bearings - Tolerances - Definitions EN203 1, Steel FE-PL31 - Hardened and tempered - Bars - Aerospace series Steel FE-PL31 - Hardened.and tempered - Hollow bars 3,5 mm a 55 mm - Aerospace series - EN2221, EN2222, Steel FE-PL31 - Hardened and tempered - Hand
14、and die forgings - e Aerospace series EN3280, Bearings - airframe rolling - Technical specification - Aerospace series 4 Definition Self aligning ball bearing full complement (without cage), double row of balls. 1) See IS0 15. Copyright Association Europeene des Constructeurs de Materiel Aerospatial
15、 Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN3287 87 LOL23LL 0005250 4 W prEN3287 Page 4 5 Symbols I The definition of tolerances and of clearances are given in IS0 1132 and definition of loads in EN3280. dmp Dm
16、p ds Ds C FS a F = single plane mean bore diameter = single plane mean outside diameter = deviation of a single bore diameter = deviation of a single outside diameter = permissible static radial load = bearing axial load = axial component of actual bearing load max.= permissible static axial load =
17、static radial load = axial internal clearance = radial internal clearance = radial runout of assembled bearing outer ring = radial runout of assembled bearing inner ring = static equivalent radial load = coefficient of axial load 3 r Kea Kia or 6 Required characteristics 6.1 Dimensions - Tolerances
18、- Clearances - Loads - Mass Values : see table. Configuration : see figure ; the bearings can be assembled with either seals or shields. 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 EN2
19、031 or EN2221 or EN2222, 59 to 64 HRC 1). Outer ring : Steel EN2031 or EN2221 or EN2222, 59 to 64 HRC 1). Balls : Steel EN2031, 59 to 64 HRC 1). Shields : Corrosion resisting material. Seals : Polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE), coated glass fabric material. 1) For new
20、designs, bearings in corrosion resisting steel should be used preferably, see EN3289. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - prEN3287 Page
21、5 d Internal clearances um Radial runout Starting Permissible Ga 1) Gr 1) max . in mN.m radial load Axial max. Radial tolerances torque 2) static Cim Code Nominal Group Group Group Group Group Group d D C special normal 3 special normal 3 (la) (Kea) Shields Seals kNS - 430 8 337 9 5,7 425 10 91 70 -
22、2 to 6 05 5 06 6 795 12 14,l 9,0 14 16,l 10 LO 2 to 7 12,O 18 18,8 15 15 17 17 16 18,O 25 24,3 20 20 180 5 to 10 5 to 20 15 to 25 23,O 35 32,6 - 100 2 to 13 10 to 20 08 8 , 5,s - 25 40 12 12 8o 120 3 to 9 3 to 18 13 to 23 Detail W ficabe to bore outer surface The process for installatian of seals an
23、d shields is at the manufacturers option. Figure 1 1) Group special : code R i Group 2) Definition : see EN3280 C normal : code N ; Group 3 : code L S Table 1 Dimensions in millimetres For ultimate static loads, see EN3280. J - Copyright Association Europeene des Constructeurs de Materiel Aerospatia
24、l Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN3287 87 LOL23iL O005252 B m prEN3287 Page 6 7 Designation Each bearing shall only be designated Description block BEARING as in the following example : Identity bloc
25、k EN32878 il Number of EN standard 1 A = Code for ester type grease N = Code for internal radial clearance, 10 = diameter code of d (see table) normal group P = code for type with shields where the following codes are applied : Greases A = ester type grease B = synthetic hydrocarbon type grease E =
26、with seals P = with shields Clearances L = internal radial/axial clearance, group : 3 N = internal radial/axial clearance, group : normal R = internal radial/axial clearance, group : special Note : If necessary, the originator code S9005 may be introduced between the description block and the identi
27、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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
