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). 1 Scope O - This standard specifies the characteristics of single row self aligning roller bearings
2、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 their control mechanisms. 2 Field of application The airframe rolling bearings defined in this standard shall be
3、 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 O - very high pressure grease, synthetic hydrocarbons, general purpose (code B), operational range -54 to +177 OC (refer to EN3280)
4、; their field of application when lubricated with code A grease shall be limited to +121 Oc. 3 IS0 IS0 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 - Ear
5、s - Aerospace series EN3280, Bearings - airframe rolling - Technical specification - Aerospace series 4 Definition Self aligning roller bearing full complement (without cage), single row of rollers. 1) See IS0 15, O b - AECMA PREN32.72 87 LOL23LL 0005280 2 i I prEN3292 Page 4 5 Symbols The definitio
6、n 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 bore diameter = deviation of a single outside diameter = permissible static radial load = bearing a
7、xial 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 runout of assembled bearing outer ring = radial runout of assembled bearing inner ring = static equ
8、ivalent 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 assembled with either seals or shields. 6.2 Surface roughness Raceway and rolling elements : Ra =
9、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 : Corrosion resisting material. Seals : Polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE),
10、 coated glass fabric material. 1) For new designs, bearings in corrosion resisting steel should be used preferably, see EN3292. 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、-11 + 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
12、 Group 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
13、 30,O 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 AECMA PREN3292 87 10L23LL 0005282 b prEN3292 Page 6 I 7 Designation E
14、ach bearing shall only be designated as in the following example : Description block Identity block BEAR I NG 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 fol
15、lowing codes are applied : Greases A = ester type grease B = synthetic hydrocarbon type grease E = with seals 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 introdu
16、ced between the description block 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 specificaeion . Bearings supplied to this standard shall conform with the requirements of EN3280.
