1、A. E. C I M a A. STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM prEN3290 Issue P 1 September 1987 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : 629.7.02 : 622.822.8.004.1 : 621.828 : 669.54 Key words : Aircraft indu
2、stry, airframe bearings, self-aligning bearings, roller bearings, steel, dimensions, static loaas ENGLISH VERSION Aerospace series Bearings-airframe rolling single row, self-aligning roller bearings in steel diameter series 3 and 4 Dimensions, torques, clearances and loads Srie arospatiale Luft- und
3、 Raumfahrt Roulements por structures daronefs Flugwerklager roulements rotule sur une range de rouleaux sries de diamtres 3 et 4 Dimensions, couples. jeux et charges einreihige Tonnenlager Durchmesserreihen 3 und 4 Mape, Momente. Lagerluft und Belastungen en acier aus Stahl This derospace Series. pr
4、e-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de MatirArospatiI. It is published on green paper for the needs of AECMA-Members. It kas been technicaliy approvedb y the experta of the concerned APCMA Commission following comment by the Member
5、countries. Subsequent to the publication of this pre-standard, the technical content shd not be changed 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 (N?S)
6、 and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEfl (European Gcrmrn - internal axial clearances ; - special group for the internal radial clearance ; - runout tolerances (transferred from the technical specification). prEN
7、3290 Page 3 1 Scope This standard specifies the characteristics of single row self aligning roller bearings of diameter series 3 and 4 1) 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 thei
8、r 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 OC or - very high pressure gre
9、ase, synthetic hydrocarbons, general purpose (code B), operational range -54 to +177 OC (refer to EN3280) ; their field of application when lubricated with code A grease shall be limited to +121 OC. a 3 References IS0 15-1981, Rolling bearings - Radial bearings - Boundary dimensions - General plan I
10、S0 1132-1980, Rolling bearings - Tolerances - Definitions EN2031, Steel FE-PL31 - Hardened and tempered - Bars - Aerospace series EN2221 9 Steel FE-PL31 - Hardened and tempered - Hollow bars 3,5 mm 55 mm - Aerospace series a 5 EN2222, Steel FE-PL31 - Hardened and tempered - Hand and die forgings - 9
11、 Aerospace series EN3280, Bearings - airframe rolling - Technical specification - Aerospace series 4 Definition Self aligning roller bearing full complement (without cage), single row of rollers. prEN3290 Page 4 5 Symbols The definition of tolerances and of clearances are given in IS0 1132 and defin
12、ition of loads in EN3280. dmp Dmp ds Ds C = permissible static radial load FS a F max.= permissible static axial load Fa = static radial load Gr Kea Kia or = single plane mean bore diameter = single plane mean outside diameter = deviation of a single bore diameter = deviation of a single outside dia
13、meter = bearing axial load = axial component of actual bearing 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 S Y 6 Required charac
14、teristics 6.1 Dimensions - Tolerances - 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 um
15、. 6.3 Materials Inner ring : Steel EN2031 or EN2221 or EN2222, 59 to 64 HRC 1). Outer ring : Steel EN2031 or EN2221 or EN2222, 59 to 64 HRC 1). Rollers : Steel EN2031, 59 to 64 HRC 1). Shields : Corrosion resisting material. Seals : Polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE), .
16、 coated glass fabric material. 1) For new designs, bearings in corrosion resisting steel should be used preferably, see EN3292. AECMA PREN3290 87 m lrOL23LL 0005269 3 m prEN3290 Page 5 *E Bearing wich Detail W applicable to bore and outer surface E The process for installation of seals and shields i
17、s at the manufacturer Figure 1 s option. Internal clearances um d I Axial ma. I Radial special special L+q10 to 20 17 220 250 I 3 ta 10 20 20 25 25 240 290 30 30 15 to 25 Radial runout Starting tolerances ma. torque 2) in mN.m Cim (Kia) (K 1 ea Shields Seals 25 40 38 ,O 30 45,O 40 60,O 35 52,o 1) Gr
18、oup special : code R ; Group 2 : code K 2) Definition : see EN3280 C s F max. =- where Ys = 3,3 ; P = P -F 3,3 F where P C a or r a or - s static loads, see EN3280. Permissib le static radial load C kNS 36.7 53,9 60,2 69.6 -, 94,5 113,2 161,7 215,6 I AECMA PREN3290 87 m LOL23LL 0005270 T prEN3290 Pa
19、ge 6 7 Designation Each bearing shall only be designated as in the following example : Description block Identity block K = Code for internal radial III clearance, group 2 . 1 I I I 10 = diameter code of d (see table) P = eode for type with s.elcis 1 where the following codes are applied : Gr eas e
20、s A =. ester type grease B = synthetic hydrocarbon type grease E = with seals P = with shields Clearances K - internal radial/axia% c%earbnce, group : 2 R = internal radial/axial clearance, group : special Note : If necessary, the originator code S9005 may be introduced between the description block
21、 and the identity 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.
