1、 - I I- AECMA PREN3292 87 = 101-2311 0005277 2 R, - internal 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 lice
2、nse with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 Scope O - 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. T
3、hey are intended for use between fixed and moving parts of the aircraft 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
4、 grease, ester type (code A), operational range -73 to +121 OC or O - very high pressure grease, 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. 3 IS0 IS0
5、 EN2 References 15-1981, Rolling bearings - Radial bearings - Boundary dimensions - Generai plan 1132-1980, Rolling bearings - Tolerances - Definitions 30 Steel FE-PL43 - Hardened and tempered - Ears - Aerospace series EN3280, Bearings - airframe rolling - Technical specification - Aerospace series
6、4 Definition Self aligning roller bearing full complement (without cage), single row of rollers. 1) See IS0 15, O Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license f
7、rom IHS-,-,-b - AECMA PREN32.72 87 LOL23LL 0005280 2 i I prEN3292 Page 4 5 Symbols The definition of tolerances and of clearances are given in IS0 1132 and definition of loads in EN3280. dmp Dmp *ds DS = single plane mean bore diameter = single plane mean outside diameter = deviation of a single bor
8、e diameter = deviation of a single outside diameter = permissible static radial load = bearing axial load = axial component of actual bearing load C F Fa = static radial load Gr Kea Kia Or Y F: Ga max,= permissible static axial load = axial internal clearance = radial internal clearance = radial run
9、out of assembled bearing outer ring = radial runout of assembled bearing inner ring = static equivalent radial load = coefficient of axial load S 6 Required characteristics 6.1 Dimensions - Tolerances - Clearances - Loads - Mass Values : see table. Configuration : see figure ; the bearings can be as
10、sembled 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 urn. 6.3 Materials Inner ring : Steel EN2030, 58 HRC. Outer ring : Steel EN2030, 58 HRC. Rollers : Steel EN2030, 158 HRC. Shields : Corrosi
11、on resisting material. Seals : Polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE), coated glass fabric material. 1) For new designs, bearings in corrosion resisting steel should be used preferably, see EN3292. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Pr
12、ovided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-B Bearing with I Tolerances vm C B P 6 1 Mass prEN3292 Page Detail W applicable to bore and outer surface O O dl -0,12 -0,12 dmp Lhq ds Ds O +2 -9 f 2 -11 O o + 3 21,8 * 8 -11 +
13、3 -14 17 14,O 21 14 17 fis7 -10 , 18,O 23 25,l -11 O + 3 + 4 -10 -13 -13 -17 27 E kg/1000 1: parts % 58 0,3 91 to 106 0,8 132 186 246 0,3 397 610 to 1 I 5 d Code Nominal 08 8 16 10 The process for installation of seals and shields is at the manufacturers option. Figure 1 Axial ma. G 1) a Group Group
14、 special 2 190 230 I I 1 Radial G 1) r Group Group special 2 I tolerances ma. torque 2) static Cim in mN,m radial load d D C (Kia) (K Shields Seals kNs ea I Internal clearances um I Radial runout I Starting I Permissible I 25 i 25 1- 240 290 I .I 30 30 3 LO 10 i5 to 25 25 I 7 111.0 I 36.7 I 4Q 30,O
15、I I 30 145.0 I 113.2 I I I-, I 161,7 215,6 1) Group special : code R ; Group 2 : code K 2) Definition : see EN3280 C S F ma. =- where Y = 3,3 j P = P + 3,3 F where P C For ultimate static loads, see EN3280. or - s a S or r a Copyright Association Europeene des Constructeurs de Materiel Aerospatial P
16、rovided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN3292 87 10L23LL 0005282 b prEN3292 Page 6 I 7 Designation Each bearing shall only be designated as in the following example : Description block Identity block BEAR I N
17、G EN3292 T Number of EN standard A = Code for ester type grease K = Code for internal radial clearance, normal group I i0 = diameter code of d (see table) P code for with shields where the following codes are applied : Greases A = ester type grease B = synthetic hydrocarbon type grease E = with seal
18、s P .= with shields Clearances K = internal radial/axial clearance, group : 2 R = internal radial/axial clearance, group : special Note : If necessary, the originator code S9005 may be introduced between the description block and the identity block. 8 Marking In addition to the manufacturers own mar
19、king, 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 specificaeion . 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 AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
