1、BRITISH STANDARD AEROSPACE SERIES BS EN 2790:1991 Rod ends, adjustable, self-aligning plain bearing with self-lubricating liner and threaded shank with engagement: 1.5 thread diameter Dimensions and loads This European Standard EN2790:1991 has the status of a BritishStandardBSEN 2790:1991 This Briti
2、shStandard was published under the authority ofthe Standards Board and comesinto effect on 30August1991 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 88/76837 DC ISBN 0 580 19886 3 Cooperating organizations The European Com
3、mittee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad F
4、inland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano d
5、i Unificazione Luxemburg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland As
6、sociation suisse de normalisation United Kingdom BritishStandards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 2790:1991 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 2790 3 National appendix NA Insid
7、e back cover National appendix NB Inside back coverBSEN 2790:1991 ii BSI 12-1999 National foreword This BritishStandard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN2790 “Aerospace series Rod ends, adjustable, self-alignin
8、g plain bearing with self-lubricating liner and threaded shank with engagement:1.5 thread diameter Dimensions and loads” published by the European Committee for Standardization (CEN). EN2790 was produced as a result of international discussions in which the United Kingdom took an active part. A Brit
9、ish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fron
10、t cover, an inside front cover, pagesi andii, the EN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD
11、NORME EUROPENNE EUROPISCHE NORM EN 2790 UDC 629.7.02+05:621.827.1:621.85.053.004.1:621.828+408.2.72 Key words: Aircraft industry, flight control, rod ends, swivel-end pieces, linings, self-lubricating parts, threaded shanks, dimensions, static loads English version Aerospace series Rod ends, adjusta
12、ble, self-aligning plain bearing with self-lubricating liner and threaded shank withengagement:1,5 thread Dimensions and loads Srie arospatiale Embouts rglables rotule garniture autolubrifiante et tige filete implantation:1,5 filetage Dimensions et charges Luft- und Raumfahrt Einstellbare senkpfe mi
13、t Gelenklager mit selbstschmierender Beschichtung und Gewindeschaft mit Einschraubtiefe von1,5 Gewinde- Mae und Belastungen This European Standard was accepted by CEN on6June1990. CEN members are bound to comply with the requirements of CEN Internal Regulations which stipulate the conditions for giv
14、ing this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official
15、versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria
16、, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue d
17、e Stassart 36, B-1050 Brussels CEN 1991 Copyright reserved to all CEN members Ref. Nr. EN2790:1991 EEN 2790:1991 BSI 12-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with th
18、e rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. According to the Common CEN/CENELEC Rules, the following countries are bound to implement this
19、European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope and field of application 3 2 References 3 3 Symbols 3 4 Required charact
20、eristics 3 5 Designation 5 6 Marking 5 7 Technical specification 5 Figure 4 Table 1 4 Table 2 5EN 2790:1991 BSI 12-1999 3 1 Scope and field of application This standard specifies the characteristics of adjustable rod ends consisting of: a self-aligning ball bearing with self-lubricating liner EN2501
21、; a rod end body with threaded shank comprising: a circumferential groove to identify engagement; an optional longitudinal groove for locking purposes. These rod ends are intended for use with flight control rods or rods for aircraft structures. They are intended to be used within the temperature ra
22、nge:55 C to+150 C. 2 References ISO1132, Rolling bearings Tolerances Definitions. ISO3353, Aerospace construction Rolled threads Runout and lead threads. ISO5855-2, Aerospace MJ Threads Part2: Limit dimensions for bolts and nuts. EN2064, Aerospace series Bearings, spherical plain in corrosion resist
23、ing steel with self-lubricating liners Technical specification 1) . EN2068, Aerospace series Rod ends with self-lubricating, self-aligning bearings Technical specification 2) . EN2133, Cadmium plating of steels with maximum specified tensile strength equal to or less than1450MPa, and copper and copp
24、er alloys Aerospace series 1) . EN2137, Steel FE-PL75 1100MPau R m u1250MPa Bars D e u 100mm Aerospace series 1) . EN2475, Steel FE-PL74 1100MPau R m u1300MPa Bars D e u 100mm Aerospace series 1) . EN2476, Steel FE-PL74 1100MPau R m u1300MPa Forgings D e u 100mm Aerospace series 1) . EN2498, Aerospa
25、ce series Rod ends adjustable self-aligning plain bearing with self-lubricating liner and threaded shank Dimensions and loads. EN2501, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating liner and wide inner ring Dimensions and loads. Symbols 3 Required char
26、acteristics 3.1 Dimensions Tolerances Masses Configuration: see Figure. Dimensions, tolerances and masses: see Figure and Table 1 and Table 2, values after cadmium plating. 3.2 Surface roughness See Figure, values prior to cadmium plating. 3.3 Loads and rotational starting torques See Table 2. 1) Pu
27、blished as AECMA standard at the date of publication of the present standard. 2) Published as AECMA prestandard at the date of publication of the present standard. % ds = deviation of a single bore diameter a % dmp = single plane mean bore diameter deviation a = maximum displacement angle which can
28、be formed by the outer ring with the inner ring, the spherical surface of the outer ring being fully in contact with that of the inner ring C 25 = permissible dynamic radial load by25000 cycles (for definition see EN2064). a For definition of tolerances see ISO1132.EN 2790:1991 4 BSI 12-1999 3.4 Mat
29、erials Rod end body: Steel EN2137 or EN2475 or EN2476 Hardness33u HRCu 39. Plain bearing: See EN2501. 3.5 Surface treatment Rod end body: Cadmium plating EN2133,7m to20m except threads5m to10m, chromate passivation optional. Table 1 NOTE 1The circumferential groove and the longitudinal groove over t
30、he distance F shall be painted red. NOTE 2The swaging of the bearing in the rod end body is at the manufacturers option. Figure Dimensions in millimetres d A +0,2 0 E +0,1 0 Thread designation a F b min. G c min. H +0,5 1 L 0,5 M +0,1 0 N 0 0,1 S Mass g Reference to be used for the designation Code
31、Nominal diameter 06 6 22,5 8,2 MJ10 1,254h6h 23 37 37 54 2,4 8,0 0,8 46 EN2790 08 8 26,0 10,2 MJ12 1,254h6h 27 42 42 62 10,2 76 10 10 32,0 13,2 MJ14 1,54h6h 31 48 48 73 3,2 12,2 1,0 135 EN2498 d a According to ISO5855-2; manufacturing method: rolled. b F is also the minimum length of engaged thread,
32、 it includes thickness of lock washer and height of nut. c G=minimal length of useful thread. d The reference EN2790 has been used in the pre-standard.EN 2790:1991 BSI 12-1999 5 Table 2 4 Designation Each rod end shall only be designated as in the following example: Where the following codes are app
33、lied: NOTEIf necessary, the originators code19005 may be introduced between the description block and the identity block. 5 Marking In addition to the manufacturers own marking, each rod end and its packaging shall be marked using the identity block specified in clause4. The position and method of m
34、arking are at the manufacturers option, it shall not have any detrimental effect on the rod end. 6 Technical specification See EN2068. Dimensions in millimetres After swaging of the plain bearing in the rod end body Spherical plain bearings with self-lubricating liner EN2501 (Reference only) Permiss
35、ible dynamic radial load a C 25 kN Axial push out load kN Starting torque N.m. Ultimate static load c kN B 0 0,06 C +0,1 0 D d d d 1 min. r ! degrees Nom. Tolerances m % dmp % ds 16,6 4,5 0,45 to1,30 27 14 8 18 6 0 8 + 2 10 9,0 0,3 to 0,8 9 25,2 6,5 0,70 to2,00 39 15 10 21 8 11,0 8 38,6 b 10,5 58 20
36、 13 26 10 13,5 10 a Along the axis of the rod end. b This load is equal to the2/3 ultimate static load of the rod end and not to the load from EN2501. c Ultimate loads are given because failure may occur in the rod end not in the bearing. Users shall apply their own factors to obtain the permissible
37、 static load. d The relevant fit is at the manufacturers option. L = left hand thread R = right hand thread K = with groove T = without groove6 blankBSEN 2790:1991 BSI 12-1999 National appendix NA The United Kingdom participation in the preparation of this European Standard was entrusted by the Aero
38、space Standards Policy Committee (ACE/-) to Technical Committee ACE/14 upon which the following bodies were represented: British Independent Steel Producers Association Civil Aviation Authority (Airworthiness Division) Federation of Wire Rope Manufacturers of Great Britain Institute of Petroleum Min
39、istry of Defence Society of British Aerospace Companies Limited Stainless Steel Wire Industry Association National appendix NB The BritishStandards corresponding to the European Standards referred to in the text are identical in number and title with those given in clause2. The BritishStandards corr
40、esponding to the International Standards referred to in the text are as follows. International Standard BritishStandard ISO1132:1980 BS6107 Rolling bearings: tolerances Part1:1981 Glossary of terms (Identical) ISO335-3:1976 BS A231:1982 Specification for runout and lead threads for rolled threads (I
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