1、BS EN 2755:2009ICS 49.035NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Bearings, sphericalplain in corrosionresisting steel withself-lubricatingliner Elevatedload at ambienttemperature Technical specificationThis British Standardwas published
2、under theauthority of the StandardsPolicy and StrategyCommittee on 31 August2009 BSI 2009ISBN 978 0 580 68750 1Amendments/corrigenda issued since publicationDate CommentsBS EN 2755:2009National forewordThis British Standard is the UK implementation of EN 2755:2009.The UK participation in its prepara
3、tion was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible fo
4、r its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 2755:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 2755July 2009ICS 49.035English VersionAerospace series - Bearings, spherical plain in corrosionresisting steel with self-lubricat
5、ing liner - Elevated load atambient temperature - Technical specificationSrie arospatiale - Rotules en acier rsistant lacorrosion garniture autolubrifiante - Srie charge leve temprature ambiante - Spcification techniqueLuft- und Raumfahrt - Gelenklager, auskorrosionsbestndigem Stahl mit selbstschmie
6、renderBeschichtung - Reihe hohe Belastungen beiRaumtemperatur - Technische LieferbedingungenThis European Standard was approved by CEN on 16 April 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status
7、 of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A ver
8、sion in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denm
9、ark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATION
10、EUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2755:2009: EBS EN 2755:2009EN 2755:2009 (E) 2 Contents Page Foreword 4 1 Scope 5 2 Normative refe
11、rences 5 3 Terms and definitions . 6 4 Requirements characteristics, inspection and test method . 7 5 Quality assurance 18 5.1 Production qualification 18 5.2 Acceptance conditions .19 5.2.1 Inspection and tests to be carried out by the manufacturer .19 5.2.2 Purchasers (users) quality control .19 6
12、 Packaging .19 7 Certificate of compliance 19 Annex A (normative) Verification of permissible and ultimate static loads24 A.1 Permissible radial static load (Cs) 24 A.1.1 Principle 24 A.1.2 Method 24 A.2 Ultimate radial static load .24 A.2.1 Principle 24 A.2.2 Method 24 A.3 Permissible axial static
13、load (Ca) 25 A.3.1 Principle 25 A.3.2 Method 25 A.4 Ultimate axial static load .25 A.4.1 General 25 A.4.2 Principle 25 A.4.3 Method 25 Annex B (normative) Verification of dynamic radial load (C25) .28 B.1 Principle 28 B.2 Method 28 B.2.1 Testing at ambient temperature .28 B.2.2 Testing at low temper
14、ature .28 B.2.3 Testing at elevated temperature.28 B.2.4 Test at ambient temperature after immersion 29 Annex C (normative) Fluids Essential characteristics .30 C.1 Fuel for turbine aero engine .30 C.2 Fluids for de-icing circuit 30 C.3 Hydraulic fluids 30 C.3.1 Mineral fluid for hydraulic transmiss
15、ion .30 C.3.2 Phosphate of ester hydraulic fluid .30 C.4 De-icing and anti-icing fluids 30 Annex D (normative) Measurement of the peel strength of the liner .31 D.1 Principle 31 D.2 Method 31 Annex E (normative) Simplified qualification procedure 33 E.1 Rules for application .33 E.1.1 General 33 BS
16、EN 2755:2009EN 2755:2009 (E) 3 E.2 Choice of references . 33 E.3 Rules for qualification . 34 E.3.1 If the manufacturer has not previously obtained qualification according to this standard the first metric or inch series plain bearing to be tested shall be subject to full testing (number of samples:
17、 13). . 34 E.3.2 To obtain the qualification of the other dimensions, the selected plain bearings should pass according to this standard: . 34 E.3.3 Qualification of one plain bearing size of an EN product standard qualifies the plain bearing immediately before and the one immediately after the plai
18、n bearing in question, within the range of plain bearings indicated in the product standard. 35 E.3.4 To qualify on group, at least one dimension of each torque type of plain bearing should have been qualified. 35 E.3.5 As inch and metric series plain bearings are very similar in group 1 and 2, qual
19、ification of one metric size bearing of an EN product standard qualifies the inch size bearing in accordance with Table E.2. 35 E.4 Plain bearing distribution . 35 BS EN 2755:2009EN 2755:2009 (E) 4 Foreword This document (EN 2755:2009) has been prepared by the Aerospace and Defence Industries Associ
20、ation of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This
21、European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010. Attention is drawn to the possibility that some of the
22、 elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement th
23、is European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the
24、 United Kingdom. BS EN 2755:2009EN 2755:2009 (E) 5 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for spherical plain bearings in corrosion resisting steel, with self-lubricating liner, for elevated loads at ambient
25、temperature intended for use in fixed or moving parts of the aircraft structure and control mechanisms. This standard applies whenever referenced. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition
26、cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2064, Aerospace series Bearings spherical plain in corrosion resisting steel with self-lubricating liner Technical specification EN 2584, Aerospace series Bearings, spherical p
27、lain in corrosion resisting steel with self-lubricating liner Narrow series Elevated loads at ambient temperature Dimensions and loads EN 2585, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating liner Wide series Elevated load at ambient temperature Dimensi
28、ons and loads EN 3048, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating liner Light series Elevated load at ambient temperature Dimensions and loads EN 4037, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating lin
29、er, reduced starting torque Light series Dimensions and loads 1EN 4038, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating liner reduced starting torque Normal narrow series Dimensions and loads 1EN 4039, Aerospace series Bearings, spherical plain in corros
30、ion resisting steel with self-lubricating liner reduced starting torque Normal wide series Dimensions and loads 1EN 4040, Aerospace series Bearings, spherical plain in corrosion resisting steel with self-lubricating liner with wide inner ring Elevated loads at ambient temperature Dimensions and load
31、s EN 4613, Aerospace series Spherical plain bearings in corrosion resisting steel with self-lubricating liner, narrow series Dimensions and loads Inch series 1EN 4614, Aerospace series Spherical plain bearings in corrosion resisting steel with self-lubricating liner, wide series Dimensions and loads
32、 Inch series 1EN 6096, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner, and extra wide inner ring Dimensions and loads Inch seriesEN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model
33、for quality assurance in design, development, production, installation and servicing (based on ISO 9001:1994) 1In preparation at the date of publication of this standard. BS EN 2755:2009EN 2755:2009 (E) 6 EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace stan
34、dard parts EN 10204, Metallic products Types of inspection documents ISO 11078, Aircraft De-icing/anti-icing fluids, ISO type II, III and IV TR 4475, Aerospace series Bearings and mechanical transmissions for airframe applications Vocabulary 23 Terms and definitions For the purposes of this document
35、, the terms and definitions given in TR 4475 and the following apply. 3.1 spherical plain bearings with self-lubricating liner spherical plain bearing consisting of two concentric rings between which is interposed a self-lubricating liner which is bonded or moulded onto the spherical inner surface o
36、r the spherical outer surface 3.2 Surface discontinuities 3.2.1 score, scratch open surface defect 3.2.2 lap surface defect where particles of metal or sharp edges are folded over and then rolled or forged into the surface 3.2.3 seam unwelded fold which appears as an open defect in the material 3.3
37、starting torque at without load torque required to start the rotation of the inner with the outer ring held stationary 3.4 Permissible static loads 3.4.1 radial Csstatic load corresponding to a permissible unit pressure multiplied by the effective projected area in the radial direction, the inner ri
38、ng being able to take any position within the limits of the tilting angle indicated in the product standard 3.4.2 axial Castatic load corresponding to a permissible unit pressure multiplied by the effective projected area in the axial direction 2Published as ASD Technical Report at the date of publi
39、cation of this standard. BS EN 2755:2009EN 2755:2009 (E) 7 3.5 dynamic radial C25load which may be withstood by a bearing submitted to an oscillatory movement for a defined number and frequency of oscillation cycles without the dimensional or other characteristics deviating from the values permitted
40、 by the technical specification of the product NOTE One oscillating cycle includes an angular displacement of the inner ring in relation to the outer ring from 0 to 25 then from 25 to 25 and finally from 25 to 0. 3.6 adhesion of the liner area where the adhesive bond is broken, or non existent, leav
41、ing a smooth and clean interface on the metallic surface 3.7 production batch batch of products composed of elements which may come from more than one element batch but which are assembled in the same production series 4 Requirements characteristics, inspection and test method See Table 1. BS EN 275
42、5:2009EN 2755:2009 (E) 8 Table 1 Clause Characteristic Requirements Inspection and test method Q aA b4.1 Material In accordance with the product standard or design documentation. Chemical analysis or certificate of compliance according to EN 10204, issued by semi-finished product manufacturer. X X X
43、 X 4.2 Dimensions, tolerances In accordance with the product standard or design documentation. Suitable measuring instruments. X X Measurement of bore and outer diameter: Rings with a width of 10 mm: in the centre plane; Rings with a width of 10 mm: in two planes parallel to the outer faces and at a
44、 distance of these faces of twice the maximum value of the ring chamfer. The minimum and maximum diameters shall be determined in each measuring plane. Measurement of ring width: The width of each ring (distance between the two faces) shall be verified at a minimum of four points. 4.3 Masses In acco
45、rdance with the product standard or design documentation. Suitable methods. X 4.4 Marking In accordance with the product standard or design documentation. It shall be legible and shall not adversely affect the material or the functioning of the bearing. Visual examination. X X 4.5 Surface appearance
46、 The bearings shall be free of surface discontinuities liable to have an adverse effect on their characteristics and endurance. The liner shall not contain contaminant products and shall not show broken or voided areas. Lubrication shall not be permitted. 4.5.1 Assembled bearings Visual inspection u
47、sing suitable methods. X X 4.5.2 Unassembled rings Magnetic or dye penetrant inspection. X X continued BS EN 2755:2009EN 2755:2009 (E) 9 Table 1 (continued) Clause Characteristic Requirements Inspection and test method Q aA b4.6 Hardness In accordance with the product standard or design documentatio
48、n. Suitable processes and measuring instruments. X X 4.7 Surface roughness In accordance with the product standard or design documentation. Suitable processes and measuring instruments. X X 4.8 Surface treatment In accordance with the product standard or design documentation. Visual inspection. X X
49、As per surface treatment standard. 4.9 Behaviour in rotation and tilt Bearings shall be able to move freely within the angular limits specified in the product standards or design documentation. Manual inspection. X X 4.10 Starting torque without load 4.10.1 At ambient temperature In accordance with the product standard or design documentation. Suitable processes and measuring instruments: X X measurement of the starting torque shall be prec
