BS-EN-2064-1992.pdf

BRITISH STANDARD BS EN 2064:1992 Bearings, spherical plain in corrosion resisting steel with self lubricating liner Technical specification The European Standard EN 2064:1992 has the status of a British Standard BS EN 2064:1992 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 August 1992 © BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 91/71314 DC ISBN 0 580 21027 8 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation française de normalisation GermanyDeutsches Institut für Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portuguès da Qualidade SpainAsociación Española de Normalización y Certificación SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 2064:1992 © BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 20643 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referencesInside back cover BS EN 2064:1992 ii © BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN 2064:1992, Aerospace series Bearings spherical plain in corrosion resisting steel with self lubricating liner Technical specification, published by the European Committee for Standardization (CEN). EN 2064 was produced as a result of international discussions in which the United Kingdom took an active part. A British 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 front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 14, 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 NORME EUROPÉENNE EUROPÄISCHE NORM EN 2064 May 1992 UDC 629.7.02:621.822.74 + 84:658.56 Descriptors: Aircraft industry, ball joints, corrosion resistant steels, linings, selflubrication parts, specifications, characteristics, inspection, tests English version Aerospace series Bearings spherical plain in corrosion resisting steel with self lubricating liner Technical specification Série aérospatiale Rotules en acier résistant à la corrosion à garniture autolubrifiante Spécification technique Luft- und Raumfahrt Gelenklager aus nictrostendem Stahl mit selbstschmierender Beschictung Technische Spezifikation This European Standard was approved by CEN on 1992-05-11. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving 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 Central Secretariat or to any CEN member. This European Standard exists in three official 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 the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1992 Copyright reserved to CEN members Ref. No. EN 2064:1992 E EN 2064:1992 © BSI 01-2000 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 the 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 European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2Field of application3 3Normative references3 4Definitions and symbols3 5Materials3 6Required characteristics4 7Inspections and tests6 8Qualification conditions6 9Acceptance conditions10 10Marking, packing and certificate of conformity11 Annex A (normative) Fluids Main characteristics12 Annex B (normative) Table of inspections and tests to be performed in respect of qualification of bearings with self lubricated liners defined in Standard EN 2022 and EN 202313 Annex C (normative) Table of tests and inspections to be performed in respect of the qualification of individual bearings with self lubricating liners14 Figure 17 Figure 28 Figure 39 Figure 410 Table 14 Table 25 Table 35 EN 2064:1992 © BSI 01-20003 1 Scope This standard specifies the required characteristics, inspections and tests, qualification, acceptance and delivery conditions for bearings with self lubricating liners, designed to be subjected under load to slow rotations and oscillations only. 2 Field of application These bearings are intended to be used between fixed and moving components of the aircraft structure, such as control surfaces, flaps, doors etc. and their control mechanisms. They are designed to be used in the temperature range of 55 °C to + 150 °C. The requirements of this standard may also be applied to other bearings, not listed in clause 3, provided that they are conditions of procurement of such bearings. 3 Normative references EN 2022, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self lubricating liner Light series Dimensions and loads. EN 2023, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self lubricating liner Normal series Dimensions and loads. EN 2501, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self lubricating liner and wide inner ring Dimensions and loads. 4 Definitions and symbols 4.1 Definitions 4.1.1 description bearings with self lubricating liners are composed of two concentric rings in corrosion resisting steel, between which there is a self lubricating liner bonded to the spherical surface of the outer ring the inner ring is wider than the outer ring which permits a rocking movement, in addition to rotation the outer ring does not contain any engagement slot this outer ring may be provided with swaging grooves for direct fitting to the structure 4.1.2 loads Permissible static loads The permissible static toad is the maximum permissible load (without safety factor), which can be applied statically. It is defined as a unit pressure multiplied by the effective projected area (radial or axial), for deformations that are compatible with correct operational behaviour. Permissible static radial load Cs The permissible static radial load corresponds to a unit pressure of 410 MPa. Permissible static axial load Ca The permissible static axial load corresponds to a unit pressure of 205 MPa. Ultimate static load The ultimate static radial or axial load is 1,5 times the value of the permissible static loads and is defined as being the highest load the bearing can support, without failure occurring. Permissible dynamic radial load C25 The permissible dynamic radial load C25 is the load that a bearing can withstand, when subjected to an oscillation of ± 25° (total amplitude 50°) for 25 000 cycles, at the rate of 10 cycles per minute, without the wear of the self lubricating liner exceeding the value specified in 6.4.6. 4.1.3 starting torque the starting torque at zero load is the maximum torque recorded, when the inner ring starts to revolve, whilst the outer ring is stationary 4.2 Symbols 5 Materials The prescribed materials are specified in the dimensional standards. It is equal to: Cs= permissible static radial load Ca= permissible static axial load C25= permissible dynamic radial load at 25 000 cycles C 2,5 - - EN 2064:1992 4 © BSI 01-2000 6 Required characteristics 6.1 Dimensions, tolerances and mass These shall comply with the values specified in the dimensional standards, see 7.2. 6.2 Chemical characteristics of the material The chemical composition of the materials shall comply with the specifications listed in the dimensional standards, see 7.3. 6.3 Physical characteristics 6.3.1 Physical appearance 6.3.1.1 Bearing Bearings shall be free from scoring, cracks, splits, burrs and any other defects likely to impair their characteristics and their endurances, see 7.1.1. 6.3.1.2 Self lubricating liner The liner shall be free from all traces of contaminating products and shall not show signs of any tearing or stripped portions, see 7.1.2. 6.3.2 Hardness Inner ring: 55 u HRC u 62. Outer ring: 23 u HRC u 35. See 7.4.1. 6.3.3 Surface roughness Outer diameter of inner ring: Ra: 0,2 Èm Bore and faces of inner ring, outer diameter of outer ring: Ra: 0,8 Èm Other surfaces: Ra: 3,2 Èm See 7.4.2. 6.3.4 Lubrication No lubrication is permitted. 6.3.5 Compatibility with fluids The bearing shall retain its integrity in the presence of the following fluids: See 7.4.3 and Annex A. 6.3.6 Static performance at low temperatures The starting torque of the bearings shall be equal to or less than twice those recorded at ambient temperature (20 °C) and specified in the dimensional standards, when they are exposed to a temperature of ( 55 ± 2) °C in the test conditions specified in 7.4.4. 6.3.7 Resistance to thermal shock The starting torques of the bearings shall lie within the ranges specified in Table 1 when the bearings are subjected to the extreme alternations of temperature of 55 °C and + 150 °C in the test conditions specified in 7.4.5. Table 1 6.3.8 Bond integrity The condition of the liner edge shall comply with the requirements specified in the dimensional standards. The liner shall not contain any contaminating substances. It shall adhere tightly to the metallic substrate over at least 90 % of the contact area. No void shall be allowed which cannot be circumscribed within a circle with a diameter equal to 25 % of the ring width or 6 mm, whichever is the smallest, see 7.4.3.2 and 7.5.6.4. 6.4 Mechanical characteristics See 7.5. 6.4.1 Behaviour during rotation and rocking Bearings shall be capable of normal functioning within the temperature range prescribed. They shall not reveal any friction points when revolving or rocking, within the limits of the angle specified in the dimensional standards, see 7.5.1. 6.4.2 Permissible static radial loads Cs The permissible static radial loads Cs are specified in the dimensional standards. These shall be maintained in the test conditions defined in 7.5.2, without any higher deformations occurring than indicated in Table 2, in respect of the maximum total deformations, and in Table 3, in respect of the maximum residual deformations. aircraft engine fuel; de-icing fluid (denatured isopropyl alcohol); hydraulic fluids:mineral based; phosphate ester; synthetic sea-water. Torques specified in EN 2022 and EN 2023 Permissible torques checked after thermal shock testsa (N.m)(N.m) 0,08 to 0,500,048 to 0,50 0,12 to 0,800,072 to 0,80 0,25 to 1,000,150 to 1,00 0,40 to 2,000,240 to 2,00 0,60 to 3,500.360 to 3,50 a Calculated values based on 60 % of the minimum values prior to testing. EN 2064:1992 © BSI 01-20005 Table 2 Table 3 6.4.3 Ultimate static radial loads The ultimate static radial loads shall be 1,5 times the permissible static loads Cs specified in the dimensional standards. There shall be no evidence of any crack, split portion or separation of the constituent components having occurred after these loads have been applied in the test conditions specified in 7.5.3. 6.4.4 Permissible static axial loads Ca The permissible static axial loads Ca are specified in the dimensional standards. They shall be maintained in the test conditions specified in 7.5.4, without giving rise to any residual deformations in excess of those specified in Table 3. 6.4.5 Ultimate static axial loads The ultimate static axial loads are 1,5 times the permissible static axial loads Ca quoted in the dimensional standards. There shall be no evidence of any crack, split portion or separation of the constituent components having occurred after these loads have been applied in the test conditions specified in 7.5.5. 6.4.6 Permissible dynamic radial loads The permissible dynamic radial loads correspond to loads of: Dimensions in millimetres Nominal bore d 1010 to 1215 to 1720 to 2530 to 4045 to 50 Max. total deformation 0,250,370,430,500,751 Dimensions in millimetres Nominal bore d Maximum residual deformationa Light series subjected to Normal series, narrow subjected to Normal series, wide subjected to CsCaCsCaCsCa 5 0,080,10 6 0,08 0,10 8 10 0,080,10 12 0,08 0,10 15 17 200,090,10 220,100,10 250,110,110,120,120,140,14 300,120,120,140,140,160,16 350,140,140,170,17 400,160,160,180,18 450,180,180,200,20 500,200,200,220,22 a The maximum residual deformations in excess of 0,08 mm, when subjected to permissible static radial loads C s, and in excess of 0,10 mm when subjected to permissible static axial loads Ca, have been based on 0,3 % of the spherical diameter of the inner ring. C 2,5 - - EN 2064:1992 6 © BSI 01-2000 When these loads have been applied in the test conditions specified in 7.5.6, the bearings shall satisfy the following requirements: a wear of less than 0,13 mm on the self lubricating liner, after test