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1、BRITISH STANDARD AEROSPACE SERIES BS EN 2311:1990 Specification for Bushes with self-lubricating liner Technical specification This European Standard EN 2311 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BS
2、I BS EN 2311:1990 This British Standard was published under the authority of the Board of BSI and comes into effect on 31 December 1990 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 83/79722 DC ISBN 0 580 18672 5 Cooperatin
3、g organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation Denmar
4、kDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione Nethe
5、rlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Insti
6、tution Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2311:1990 BSI 11-1999i Contents Page Cooperating organizationsInside front cover National forewordii Brief history
7、2 Text of EN 23113 National appendix AInside back cover National appendix BInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2311:1990 ii BSI 11-1999 National foreword This British Standard has been prepared under the d
8、irection of the Aerospace Standards Policy Committee and is the English language version of EN 2311 “Aerospace series. Bushes with self-lubricating liner. Technical specification”, published by the European Committee for Standardization (CEN). EN 2311 was produced as a result of international discus
9、sion in which the UK 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.
10、 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 amendme
11、nt table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2311 April 1987 UDC: 629.7.02:621.887-408.2-72:658.56 Key words: Aeronautical industry, bush, liner, sel
12、f lubricating part, specification English version Aerospace series Bushes with self-lubrication liner Technical specification Srie arospatiale Bagues avec garniture autolubrifiante Spcification technique Luft- und Raumfahrt Buchsen mit selbstschmierender Beschichtung Technische Lieferbedingungen Thi
13、s European Standard was accepted by CEN on 19 November 1986. CEN members are bound to comply with the requirements of CEN 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 bibliographic
14、al 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 versions (English, French, German). A version in any other language made by translation under the responsibility of a C
15、EN 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, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Netherlands, Norway, Portugal, Spain, Sweden, Swi
16、tzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1987 Copyright reserved to all CEN members Ref. No. EN 2311:1987 E Licensed Copy: sheffieldun sheffieldun
17、, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2311:1987 BSI 11-1999 2 Brief history This European Standard has been prepared by the European Association of Aerospace Constructors (AECMA). After enquiries and votes carried out in accordance with the rules of this Association
18、 it has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to C.E.N. According to the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Belgium, France, G
19、ermany, Italy, Netherlands, Spain, United Kingdom. Contents Page Brief history2 1Scope3 2Field of application3 3References3 4Definitions3 5Materials and surface treatment3 6Required characteristics3 7Inspections and tests4 9Acceptance9 10Marking, packaging and certificate of conformity9 Annex A Insp
20、ections and tests to be carried out for the qualification of a bush10 Annex B Inspections and tests to be carried out for the acceptance of a bush11 Annex C Fluids Main characteristics11 Annex D Details of shaft and housing requirements for test purposes13 Figure 17 Figure 27 Figure 37 Figure13 Tabl
21、e 1 Maximum total deformation8 Table 2 Maximum residual deformation8 Table Dimensions of shafts and housings for inspections and tests13 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2311:1987 BSI 11-19993 1 Scope This standard specifie
22、s the required characteristics, inspections and tests, qualification, acceptance and delivery conditions for bushes designed to be subjected under load, to slow sliding movements, rotations and small oscillations only. 2 Field of application This standard applies to bushes defined by EN 2285, EN 228
23、6, EN 2287 and EN 2288 standards used between fixed and/or 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 to + 150 C. 3 References EN 2000, Aerospace series Quality assu
24、rance requirements for the manufacture and procurement of EN aerospace standard products. EN 2030, Steel FE-PM 43 Hardened and tempered Bars D k 150 mm Aerospace series. EN 2064, Bearings spherical plain in corrosion resisting steel with self-lubricating liner Technical specification Aerospace serie
25、s. EN 2285, Bushes, plain, aluminium alloy with self-lubricating liner Dimensions Aerospace series. EN 2286, Bushes, flanged, aluminium alloy with self-lubricating liner Dimensions Aerospace series. EN 2287, Bushes, plain, corrosion resisting steel with self-lubricating liner Dimensions Aerospace se
26、ries. EN 2288, Bushes, flanged, corrosion resisting steel with self-lubricating liner Dimensions Aerospace series. 4 Definitions 4.1 description bushes with self-lubricating liner are composed of a ring in corrosion resisting steel or aluminium alloy with a self-lubricating liner bonded to the bore.
27、 As regards flanged bushes, the self-lubricating material is bonded to the outer face of the flange as well as the bore 4.2 loads permissible static load this is the maximum permissible load (without safety factor), which can be applied statically this is defined as a unit pressure multiplied by the
28、 effective projected area (radial or axial), for deformations that are compatible with correct operational behaviour permissible static radial load Cs this corresponds to a unit pressure of 430 MPa for corrosion resisting steel and 206 MPa for aluminium alloy permissible static axial load Ca (Flange
29、d bushes only) this corresponds to a unit pressure of 340 MPa for corrosion resisting steel and 160 MPa for aluminium alloy ultimate static load (radial or axial) this is 1,5 times the value of the permissible static load and is defined as being the highest load the bush will support without failure
30、 occurring permissible dynamic radial load C25 this is the load that a bush can withstand, when subjected to an oscillation of 25 degrees, (total amplitude 50 degrees) for 25 000 cycles, at the rate of 10 cycles per minute, without the wear on the self-lubricating liner exceeding the value quoted in
31、 clause 6.3.5. It equals: 4.3 starting torque the starting torque at zero load is the maximum torque recorded when the shaft starts to revolve, whilst the bush remains stationary 5 Materials and surface treatment The materials and surface treatment shall comply with the requirements of the material
32、standard specified in the dimensional standards, see 7.3. 6 Required characteristics 6.1 Dimensions, tolerances and masses these shall comply with the values quoted in the dimensional standards. See 7.2. 6.2 Physical characteristics 6.2.1 Physical appearance 6.2.1.1 The bush It shall be free from sc
33、oring, cracks, splits, burrs and any other defects likely to impair its characteristics and endurance. See 7.1.1. for corrosion resisting steel and for aluminium alloy Cs 2,5 - - Cs 1,2 - - Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN
34、2311:1987 4 BSI 11-1999 6.2.1.2 The self-lubricating liner It shall be free from all traces of contaminating products and shall not show signs of any tearing or stripped portions. See 7.1.2. 6.2.2 Surface roughness This shall comply with the values quoted in the dimensional standards. 6.2.3 Lubricat
35、ion No lubrication shall be permitted. 6.2.4 Starting torque at zero load 6.2.4.1 Ambient temperature The value of this torque is required for checking the characteristics specified in clauses 6.2.4.2 and 6.2.4.3. See 7.4.2.1. 6.2.4.2 Low temperature The starting torque shall not be greater than twi
36、ce that recorded at ambient temperature. See 7.4.2.2. 6.2.4.3 High temperature The starting torque shall not be less than 60 % of that recorded at ambient temperature. See 7.4.2.3. 6.2.5 Compatibility with fluids The bush shall retain its integrity in the presence of the following fluids: See 7.4.3
37、and Annex C. After testing the wear shall be less than 0,13 mm. 6.2.6 Bond integrity The liner shall not contain any contaminating substance. 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 circ
38、le, with a diameter equal to 25 % of the bush width or 6 mm, whichever is the smaller. See 7.4.3.2, 7.4.4 and 7.5.5.4. 6.3 Mechanical characteristics 6.3.1 Permissible static radial loads Cs The loads are quoted in the dimensional standards. These loads shall be maintained in the test conditions def
39、ined in clause 7.5.1, without any deformations occurring greater than indicated in Table 1 and Table 2. 6.3.2 Ultimate static radial loads These loads shall be 1,5 times the permissible static radial load Cs. There shall be no evidence of any crack, split portion or separation of the constituent com
40、ponents having occurred after these loads have been applied in the test conditions specified in clause 7.5.2. 6.3.3 Permissible static axial loads Ca (flanged bushes only) The loads are quoted in the dimensional standards. These loads shall be maintained in the test conditions specified in clause 7.
41、5.3 without giving rise to any deformations occurring greater than indicated in Table 1 and Table 2. 6.3.4 Ultimate static axial loads (flanged bushes only) These loads shall be 1,5 times the permissible static axial loads Ca. There shall be no evidence of any crack, split portion or separation of t
42、he constituent components having occurred after these loads have been applied in the test conditions specified in clause 7.5.4. 6.3.5 Permissible dynamic radial loads C25 When the loads have been applied in the test conditions specified in clause 7.5.5 wear shall not exceed: 7 Inspections and tests
43、7.1 Visual inspection 7.1.1 The bush An inspection of the external condition shall confirm that: there are none of the defects specified in clause 6.2.1.1 there is no lubrication, as specified in clause 6.2.3 the marking conforms with the provisions described in clause 10.1 7.1.2 The self-lubricatin
44、g liner The self-lubricating liner shall not reveal any of the defects described in clause 6.2.1.2. 7.2 Dimensions, tolerances and mass They shall comply with those shown in the dimensional standards. aircraft engine fuel de-icing fluid (denatured isopropyl alcohol) hydraulic fluids :mineral based p
45、hosphate ester based artificial sea-water 0,13 mm after tests at ambient temperature : see 7.5.5.1 0,13 mm after tests at extreme temperature : see 7.5.5.3 0,20 mm after tests at low temperature : see 7.5.5.2 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 02:05:53 GMT+00:00 2006, Uncontrolle
46、d Copy, (c) BSI EN 2311:1987 BSI 11-19995 The measurement of the bore shall be carried out with an instrument suited to the hardness and surface roughness of the liner material. 7.3 Chemical characteristics of the material The method used to check the chemical analysis shall be left to the discretio
47、n of the manufacturer. 7.4 Physical roughness 7.4.1 Surface roughness The surface roughness, measured with conventional instruments shall comply with the values specified in the dimensional standards. 7.4.2 Starting torque at zero load The bush shall be mounted in a test device as shown in the Figur
48、e of Annex D. 7.4.2.1 Ambient temperature The test is carried out at 20 2 C with the bush stationary, whilst the shaft is rotated about its axis. The maximum starting torque necessary to cause the shaft to rotate shall be recorded. 7.4.2.2 Low temperature The bush shall be subjected to a temperature
49、 of 55 2 C for four hours. Immediately after, the starting torque shall not exceed twice the value recorded at ambient temperature. 7.4.2.3 Extreme temperature The bush shall be subjected to ten successive tests, each test comprising a period of 1 hour at 55 2 C followed by one hour at 150 2 C. Four hours after this series of tests, the starting torque, measured in accordance with 7.4.2.1, shall correspond to the values shown in 6.2.4.3. 7.4.3 Tests on compatibility with f