1、BS EN 2311:2017 Aerospace series Bushes with self-lubricating liner Technical specification BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 2311:2017 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 2311:2017. It supersed
2、es BS EN 2311:2012 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport
3、to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017 ISBN 978 0 580 95932 5 ICS 49.030.99 Compliance with a British Standard cannot confer immunity from legal obligati
4、ons. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2017. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS EN 2311:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2311 March 2017 ICS 49.035 Supe
5、rsedes EN 2311:2012 English Version Aerospace series - Bushes with self-lubricating liner - Technical specification Srie arospatiale - Bagues avec garniture autolubrifiante - Spcification technique Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische Lieferbedingungen This
6、European Standard was approved by CEN on 2 January 2017. 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 reference
7、s concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 mem
8、ber into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Fr
9、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EURO
10、PISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2311:2017 EBS EN 2311:2017 EN 2311:2017 (E) 2 Contents Page European foreword . 3 1 Sc
11、ope . 4 2 Normative references . 4 3 Terms and definitions. 5 4 Required characteristics, inspection and test methods . 7 5 Quality assurance 11 6 Acceptance conditions . 12 7 Packaging . 12 8 Certificate of compliance 13 (normative) Testing of permissible and ultimate static loads 15 A.1 Permissibl
12、e radial static loads (C s ) 15 A.2 Ultimate radial static loads 15 A.3 Permissible axial static loads (C a ) 16 A.4 Ultimate axial static loads 17 (normative) Testing of permissible radial dynamic loads (C 25 ) . 19 B.1 Principle 19 B.2 Method . 19 (normative) Fluids Essential characteristics 22 C.
13、1 Fuel for turbine aero engine 22 C.2 Fluids for de-icing circuit 22 C.3 Hydraulic fluids 22 C.4 De-icing and anti-icing fluids 23 (normative) Resistance of the liner to peeling . 24 D.1 Principle 24 D.2 Method . 24 (normative) Measurement of friction coefficient for EN 4534-2, EN 4535-2, EN 4536-2
14、and EN 4537-2 (for inch size only) 25 E.1 Principle 25 E.2 Starting torque under load C 25at room temperature 25 (informative) Permissible unit pressure. 27 (informative) Standard evolution form . 28 BS EN 2311:2017 EN 2311:2017 (E) 3 European foreword This document (EN 2311:2017) has been prepared
15、by the Aerospace and Defence Industries Association 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 o
16、f ASD, prior to its presentation to CEN. This 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 September 2017, and conflicting national standards shall be withdrawn at the latest by September 2017. Atte
17、ntion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 2311:2012. According to the CEN-CENELEC Internal Regulations, the national st
18、andards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
19、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 2311:2017 EN 2311:2017 (E) 4 1 Scope This document specifies the required characteristics, inspections and tests, quality assurance and qua
20、lification, acceptance and delivery conditions for bushes, designed to be subjected under load, to slow sliding movements, rotations and small oscillations only for aerospace applications. This standard applies to all bushes when referred to in the respective product standards or in a design documen
21、tation. The liner is designed to be used in the temperature range of 50 C to 163 C. Aluminium bushes are limited to 55 C to 121 C. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated ref
22、erences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2285, Aerospace series Bushes, plain, aluminium alloy, with self-lubricating liner Dimensions and loads EN 2286, Aerospace series Bushes, flanged alum
23、inium alloy, with self-lubricating liner Dimensions and loads EN 2287, Aerospace series Bushes, plain corrosion resisting steel, with self-lubricating liner Dimensions and loads EN 2288, Aerospace series Bushes, flanged, corrosion resisting steel, with self-lubricating liner Dimensions and loads EN
24、2755, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated loads at ambient temperature Technical specification EN 4534-2, Aerospace series Bushes, plain in aluminium alloy with self-lubricating liner, elevated load Part 2: Dimensions and load
25、s Inch series EN 4535-2, Aerospace series Bushes, flanged in aluminium alloy with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 4536-2, Aerospace series Bushes, plain in corrosion resisting steel with self-lubricating liner, elevated load Part 2: Dimensions and lo
26、ads Inch series EN 4537-2, Aerospace series Bushes, flanged in corrosion-resisting steel with self-lubricating liner, elevated load Part 2: Dimensions and loads Inch series EN 9100, Quality Management Systems Requirements for Aviation, Space and Defense Organizations EN 9133, Aerospace series Qualit
27、y management systems Qualification procedure for aerospace standard parts EN 10204, Metallic products Types of inspection documents EN ISO 8785, Geometrical Product Specification (GPS) Surface imperfections Terms, definitions and parameters BS EN 2311:2017 EN 2311:2017 (E) 5 ISO 11078, Aircraft De-i
28、cing/anti-icing fluids ISO type II, III and IV TR 4475, Aerospace series Bearings and mechanical transmissions for airframe applications Vocabulary 1)3 Terms and definitions For the purpose of this standard the terms and definitions given in TR 4475 and the following definitions apply. 3.1 bush with
29、 self-lubricating liner ring in corrosion resisting steel or aluminium alloy with a self-lubricating liner bonded to the bore Note 1 to entry: With regards to flanged bushes the self-lubricating material is bonded to the outer face of the flange as well as the bore. 3.2 loads 3.2.1 permissible stati
30、c load C S or permissible static axial load C a (flanged bushes only) maximum permissible load (without safety factor), which can be applied statically Note 1 to entry: It is defined as a unit pressure multiplied by the effective projected area (radial or axial) for deformations that are compatible
31、with correct operational behaviour. 3.2.2 ultimate static load (radial or axial) 1,5 times the value of the permissible static load Note 1 to entry: It is defined as being the highest load the bush will support without failure occurring. 3.2.3 permissible dynamic radial load C 25 load that a bush ca
32、n withstand, when subjected to an oscillating motion for 25 000 cycles at the rate of (12 2) cycles/min 3.2.4 cycle angular displacement of the shaft in relation to the lined bush of 0 to 25, then of 25 to +25 and finally +25 to 0, see Figure 1 Figure 1 Cycle 1)Published as ASD-STAN Technical Report
33、 at the date of publication of this standard. http:/www.asd-stan.org/ BS EN 2311:2017 EN 2311:2017 (E) 6 3.3 friction torque under load at ambient temperature coefficient of friction calculated as follows: = 25 where is the coefficient of friction; T is the dynamic rotational torque under load, expr
34、essed in Newton meters (Nm); R is the radius of shaft, expressed in metres (m); C25 is the dynamic radial load, expressed in Newton (N). 3.4 surface discontinuities 3.4.1 crack linear recession with a sharp bottom resulting from a disturbance of the integrity of the surface and of the parent materia
35、l of the workpiece SOURCE: EN ISO 8785, modified: figure not included 3.4.2 scratch score surface imperfection which is a recession of irregular shape and unspecified direction SOURCE: EN ISO 8785, modified: synonym “score” added, figure not included 3.4.3 lap tongue-like raising of small thickness,
36、 often in the form of a seam, caused by folding over of material and forcing it into the surface when rolling, forging etc. SOURCE: EN ISO 8785, figure not included 3.4.4 seam non-welded fold which appears as an open defect in the material 3.5 void area where the adhesive bond is broken or non-exist
37、ent leaving a smooth and clean area on the metallic surface Note 1 to entry: Used in context of adhesion of the liner. 3.6 delivery batch consists of bushes bearing the same identity block although they may originate from different manufacturing batches BS EN 2311:2017 EN 2311:2017 (E) 7 4 Required
38、characteristics, inspection and test methods According to Table 1. Table 1 Required characteristics, inspection and test methods (1 of 4) Clause Characteristics Requirements Inspection and test method Q aA a4.1 Materials In accordance with the product standards or design documentation Chemical analy
39、sis and physical properties or a certificate of compliance according to EN 10204, 3.1B issued by the semi-finished product manufacturer. X X 4.2 Dimensions and tolerances In accordance with the product standards or design documentation Suitable measuring instruments Measurement of the bore band of t
40、he outer diameter Rings having a width of 10 mm: in two planes parallel to the outer faces and placed at a distance from these faces twice the maximum chamfer value of these rings. Measurement of widths of rings: A minimum four point check on the width of each ring (distance between the two faces).
41、X X 4.3 Masses In accordance with the product standards or design documentation Suitable methods X 4.4 Marking In accordance with the product standards or design documentation Visual examination X X 4.5 Surface appearance The bushes shall be free of surface discontinuities liable to have a detriment
42、al effect on the characteristics and durability. The liner shall not contain contaminant products and shall not show broken or voided areas. No lubrication allowed. Visual monitoring using appropriate procedures. X X BS EN 2311:2017 EN 2311:2017 (E) 8 Table 1 Required characteristics, inspection and
43、 test methods (2 of 4) Clause Characteristics Requirements Inspection and test method Q aA a4.6 Surface roughness Shall conform to product standards Suitable measuring instruments or visual tactile samples. X X 4.7 Static loads: Shall conform to product standards According to Annex A. X radial: C s
44、With permissible static loads no maximum total deformations greater than those indicated in Table A.1. axial: C a After removal of the loads, no permanent deformations greater than those indicated in Table A.1. 4.8 Ultimate loads radial axial After removal of the loads, no rupture, or crack. Accordi
45、ng to Annex A. X 4.9 Dynamic load and friction coefficient X 4.9.1 Dynamic radial load C 25 Shall conform to product standards. After removal of the loads: These shall be: According to Annex B. at ambient temperature no metal to metal contact between the shaft and bush. at low temperature wear of th
46、e liner shall not exceed the values indicated in Table B.1. at high temperature liners resistance to peeling and adhesion shall meet the requirements of 4.11 and 4.12. 4.9.2 Friction coefficient cAfter dynamic test and before removal of load, torque to rotate shaft shown in Figure B.1 shall be measu
47、red and the value of calculated. The value shall not exceed 0,05 at ambient temperature According to Annex E. BS EN 2311:2017 EN 2311:2017 (E) 9 Table 1 Required characteristics, inspection and test methods (3 of 4) Clause Characteristics Requirements Inspection and test method Q aA a4.10 Compatibil
48、ity between the liner and fluids The bushes shall meet the requirements of 4.9 at ambient temperature after immersion in the specified fluids. Wear of the liner shall not exceed the values indicated in Table B.1. Check one bush per fluid: the bush shall be immersed for 24 h in the fluids stated in A
49、nnex C at the following temperatures: (45 3) C for those defined in C.1 and C.2, (70 3) C for those defined in C.3, ambient temperature for those defined in C.4. Within h after this test, proceed to the test defined in B.2.4. X 4.11 Resistance of the liner to peeling The requirements of this test shall only be applied when there is an indication from the manufacturer that the liner is susceptible to peeling.
