1、A. E. C. M. A, STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2068 Issue P 1 December 1989 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : 629.7.02 + 05 : 621.827.1 : 621.85.053 : 658.56 : 621.828 -408.2 - 72 Key
2、words : Aeronautical industry, aircraft control, rod-end, rod-end with self-aligning bearing, anti- frctioning, self-lubricating part, threaded shank, specification ENGLISH VERSION . Aerospace series Rod-ends with self-lubricating self-aligning bearings Technical Specification Srie arospatiale Embou
3、ts rotule garniture autolubrifiante Spcification technique ,aft- und Raum.,rt Osenkopfe mit Gelenklager mit selbstschmierender Beschichtung Technische Lieferbedingungen This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de
4、Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shallnot be changed to
5、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 (NPSj and formal agreement of the Official Services of the Member countries it will be submitted as a draft Europ
6、ean Standard to CEN (European Committee for Standardization) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 92100 BOULOGNE-BILLANCOURT Edition approved for publication Comments should be sent within six months CI Chairman after the date of publication deci
7、sion 5th December 1989 A.E.C.M.A. Mr. MOUTARDE 88, Bd. Malesherbes 75008 PARIS - FRANCE aecma 19E i AECMA PREN2QbB 89 =-LOz=L OOOL_hi i prEN 2068 Page 2 Content c 1 2 3 4 5 6 7 . . .8 Annexe A Annexe B Scope and f le Referen ces Defini ti ons d of appl cat i on Required characteristics, inspections
8、and test methods Qual ity assurance Acceptance conditions Packag ng Certif cate .of conform ty Verif cation of ultimate static loads Bearing push-out proof load verification I. . 1 Scope and field of application This Standard specif les the required characteristics, inspections and tests , qual ity
9、assuvance, and conditions for quai If fcatlon, acceptance and del ivery of the rod ends with self-aligning self-lubricating ball bearings designed to withstand (under load) sl Ight swivel I ing and slow rotations only. Thls Standard applies to all rod ends with self-aligning self-lubricating bearing
10、s, .e. EN 2498 and EN 2790,It may be applied when referred to in a product standard or In a design specification. 2 References IS0 5855/1 Aerospace constructions - MJ Thread - Part 1 : General IS0 5855/2 , Aerospace constructions - MJ Thread - Part 2 : Limit d nuts and bolts EN 2000 Aerospace series
11、 - Quality assurance requlremTqts for and SUPDIV of EN aerospace standard products requirements mensions for he manufacture EN 2498 , Aerospaceseries - Rod ends adJustabe with self-al ign ng bearinglyith self-lubricating I iner and threaded shank - dimensions and loads EN 2501 , Bearing, spherical i
12、n corroston-resisting steel with self-lubri- cating liner and wide inner ring - dimensions and loads- Aerospace series. , Aerospace series - Rod ends adjustable with self-aligning bearing2rith self-lubricating liner and threaded shank - Dimensions and loads EN 7790 . 3 Definitions 3.1 Rod end with s
13、elf-al igning self-lubricating bearing Compris ins: - A head into which a self-aligning, self-lubricating bearing to EN2501 is mechani- - A threaded shank with circular safety groove, which may have a longitudinal groove cal ly swaged into position, for the locking-device. 3.2 Surface discontinuitie
14、s - Crack: Break in the material which may extend in all directions and be - Score or scratch: Open surface defect resulting from a tearing of the metal. - Lap: Surfaee defect where particles of metal or sharp edges are folded over and - Seam: Unwelded fold which appears as an open defect in +he mat
15、erial. intercrystal I ine or transcrystal I ne in-character. then rolled or forged into the surface. 3.3 Starting torque at zero load Torque required to start the rotation of the inner ring, with the body of the rod end held stationary. 3.4 Del ivery batch This consists of rod ends with the same ide
16、ntity block, which may come from different production batches. 1) Published as AECMA standard at the date of publication of the present standard. 2) In preparation at the date of publicatcon of the present standard. Character i.st i cs Requirements Inspections and test methods I .I I 1- I Shall conf
17、orm with product standards. Chemical analysis or cerf- f icate issued by semi-f ini- shed product manufacturer. of rod end body No surface discontinuity Magnetic inspection for except those permitted in 4.9. examp I e. .5.2 of the complete rod end l I I I I I I The bearing shal I be cor- rectly swag
18、ed into posi- tion. There shal I be no cracks in .the swaging groove ar.ea. Magnetic inspection for example. Visual check.using suitable magnif cation. I - -_ . - Shal I conform with product standards. , Suitable processes nd meacu- ring, instruments. 23 Shall conform with product standards. Suitabl
19、e measuring instrumey or visual-tactile samples. Shal I conform with product standards. - Visual examination, - AS per surface treatment standard. prEN 2068 Page 4 4 Required characteristics, inspections and test methods See table 1 . -. I I I I I I 1.1 Materi a Is 4.2 Dimens ions and to I eran ces
20、Shall conform with product standards. I men ts . Suitable measuring instru- I I I 4.3 Masses Shall conform with product Suitable methods. standards. I 1 I 1 I 4.4 qark ing Shal I conform with product standards. It shall be legible and shall not adversely affect the material or the func- tioning of t
21、he rod end. Visual examination. I I I t 4.5 Surface appearanc - I I .5.1 4.6 Hardness 4.7 Surf ace rough- ries s I 4.8- Surf ace %.riasf- ment. . I 1) Q = QuatfIcation test A = Acceptance test purposes af qual ificatfon, may be removed by .a-chemicaI process; 2) TRese Inspections shall be made in th
22、e absence of surface treatment, which, for the ; AECMA PRENZObB 89 LOL23LL OOOL970 7 -1 . prEN 2068 -Page 5 - - 4.9 4.10 4.1 1 - 4.12 - 4.13 4.14 Tab1 e (concluded) Characteri st ics Requirements rhread di sconti- iuities Thread tapping chal I con- form with product stan- dards. - No discontinuity b
23、elow effective diameter - Discontinuities not to exceed 20% of height of base thread, allowed above effective diame- ter (see Figure 2). - Surf ace irregu I ar i ti es permitted on crest of threads (see Figure 1). ;rooves Shal I not change the thread function Internal :I earances : radial shall be p
24、erceptible No play, whether axial or ;tarling torques Shall conform with the pro- It zero load duct standards. JI timate ;tatic loads Shall conform with the product standards. After the removal of the loads, there shal I be no fractures or cracks. 3earing. push- ut proof load Shal I conform with the
25、 product standards. After the removal of the loads, there shall be no lateral displacement of the bearing in the rod end. Inspections and test methods Ifsual examination - 1) Ixaminatio of micrographic iection: P - for qual if cation: on finished parts - for acceptance: by sampl ing during manufac-
26、ture. lisual and threaded gauge ;u itabl e methods. suitable procedures and mea- sur ing instruments. - Measurement of the starting torque chal I be preceded by some rotations and a few turn ing movements by hand. - Measure the torque, applied gradually to the inner ring in both directions, with th
27、rod end he Id stati onary . - Read off the value required to start up the inner ring. see Annexe A. See Annexe B, I) These checks shall be made in the absence of any surface treatment which, for qual Ification purposes, may be removed by a chemical process, i- AECMA PREN20bA 84-.U LOL23LL OOOL471 9 I prEb 2068 P push-out proof I oad The outer diane+er of the mandrel shal I be 0.75 to 1.4 times less thon the nominal outer diameter of the bearing 1 Mandre I I7 n mi I I irne:res Figure 4
