SIST EN 2311:2012
(Main)Aerospace series - Bushes with self-lubricating liner - Technical specification
Aerospace series - Bushes with self-lubricating liner - Technical specification
This European Standard specifies the required characteristics, inspections and tests, quality assurance and qualification, 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 respective product standards or in a design documentation. 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.
Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische Lieferbedingungen
Série aérospatiale - Bagues avec garniture autolubrifiante - Spécification technique
Aeronavtika - Puše s samomazalno oblogo - Tehnična specifikacija
Ta evropski standard določa zahtevane značilnosti, preglede in preskuse, zagotavljanje kakovosti in kvalifikacije, pogoje sprejema in dobave za puše, izdelane za prenašanje obremenitev, za počasno drseče premikanje, vrtenje in majhna nihanja za uporabo samo v aeronavtiki. Ta standard se uporablja za vse puše iz posameznih standardov za izdelek ali iz projektne dokumentacije. Obloga je izdelana za uporabo v temperaturnem območju delovanja od –50 do 163 °C. Puše iz aluminija so omejena na razpon od –55 do 121 °C.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische LieferbedingungenSérie aérospatiale - Bagues avec garniture autolubrifiante - Spécification techniqueAerospace series - Bushes with self-lubricating liner - Technical specification49.030.99Drugi vezni elementiOther fastenersICS:Ta slovenski standard je istoveten z:EN 2311:2012SIST EN 2311:2012en01-maj-2012SIST EN 2311:2012SLOVENSKI
STANDARDSIST EN 2311:20011DGRPHãþD
SIST EN 2311:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 2311
March 2012 ICS 49.030.99 Supersedes EN 2311:1987English Version
Aerospace series - Bushes with self-lubricating liner - Technical specification
Série aérospatiale - Bagues avec garniture autolubrifiante -Spécification technique
Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische Lieferbedingungen This European Standard was approved by CEN on 23 December 2011.
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 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 member 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2311:2012: ESIST EN 2311:2012
EN 2311:2012 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .53.1Description .53.2Loads .53.3Friction torque under load at ambient temperature .63.4Surface discontinuities .63.5Adhesion of the liner .73.6Delivery batch .74Required characteristics, inspection and test methods .85Quality assurance . 115.1Manufacturer's approval . 115.2Product qualification . 116Acceptance conditions . 116.1Manufacturer's responsibility . 116.2Inspections and tests to be carried out by the manufacturer . 116.3Customer quality control . 117Packaging . 128Certificate of compliance . 12Annex A (normative)
Testing of permissible and ultimate static loads . 15A.1Permissible radial static loads (Cs) . 15A.2Ultimate radial static loads . 15A.3Permissible axial static loads (Ca) . 16A.4Ultimate axial static loads . 16Annex B (normative)
Testing of permissible radial dynamic loads (C25) . 19B.1Principle . 19B.2Method . 19Annex C (normative)
Fluids — Essential characteristics . 21C.1Fuel for turbine aero engine . 21C.2Fluids for de-icing circuit . 21C.3Hydraulic fluids . 21C.4De-icing and anti-icing fluids . 21Annex D (normative)
Resistance of the liner to peeling . 22D.1Principle . 22D.2Method . 22Annex E (normative)
(for inch size only)
Measurement of friction coefficient for EN 4534-2, EN 4535-2,
EN 4536-2 and EN 4537-2 . 23E.1Principle . 23E.2Starting torque under load C25 at room temperature . 23Annex F (informative)
Permissible unit pressure . 25 SIST EN 2311:2012
EN 2311:2012 (E) 3 Foreword This document (EN 2311:2012) has been prepared 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 of 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 2012, and conflicting national standards shall be withdrawn at the latest by September 2012. This document supersedes EN 2311:1987. Attention is drawn to the possibility that some of the 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 this European Standard: Austria, Belgium, Bulgaria, Croatia, 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, Turkey and the United Kingdom. SIST EN 2311:2012
EN 2311:2012 (E) 4 1 Scope This European Standard specifies the required characteristics, inspections and tests, quality assurance and qualification, 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 respective product standards or in a design documentation. 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 references, 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 aluminium 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 2755, Aerospace series — Bearings, spherical plain in corrosion resisting steel with self-lubricating liner —Elevated load at ambient temperature — Technical specification EN 4534-2, Aerospace series — Bushes, plain in aluminium alloy with self-lubricating liner, elevated load — Part 002: Dimensions and loads — Inch series EN 4535-2, Aerospace series — Bushes, flanged in aluminium alloy with self-lubricating liner, elevated load — Part 002: Dimensions and loads — Inch series EN 4536-2, Aerospace series — Bushes, plain in corrosion resisting steel with self-lubricating liner, elevated load — Part 002: Dimensions and loads — Inch series EN 4537-2, Aerospace series - Bushes, flanged, corrosion-resisting steel with self-lubricating liner, elevated load - Dimensions and loads -
Inch series EN 9100, Quality management systems — Requirements for Aviation, Space and Defense Organizations EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts EN 10204, Metallic products — Types of inspection documents ISO 11078, Aircraft — De-icing/anti-icing fluids — ISO types II, III and IV SIST EN 2311:2012
EN 2311:2012 (E) 5 EN ISO 8785, Geometrical Product Specification (GPS) — Surface imperfections — Terms, definitions and parameters (ISO 8785) TR 4475, Aerospace series — Bearings and mechanical transmissions for airframe applications — Vocabulary1)
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 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. As regards 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 static radial load CS or permissible static axial load Ca (flanged bushes only) 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. 3.2.2 ultimate static load (radial or axial) 1,5 times the value of the permissible static load and defined as being the highest load the bush will support without failure occurring 3.2.3 permissible dynamic radial load C25 the load that a bush can withstand, when subjected to an oscillating movement for 25 000 cycles, at the rate of (12 ± 2) cycles/min 3.2.4 cycle
an 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°
1) Published as ASD-STAN Technical Report at the date of publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). SIST EN 2311:2012
EN 2311:2012 (E) 6
Figure 1
3.3 Friction torque under load at ambient temperature The coefficient of friction is calculated as follows: RCT⋅=25µ where µ is the coefficient of friction; T is the dynamic rotational torque under load, expressed Newtonmeter (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 material of the workpiece [SOURCE: EN ISO 8785] 3.4.2 score or scratch surface defect which is a recession of irregular shape and unspecified direction [SOURCE: EN ISO 8785] 3.4.3 lap tongue-like raising of small thickness, 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] SIST EN 2311:2012
EN 2311:2012 (E) 7 3.4.4 seam non-welded fold which appears as an open defect in the material 3.5 Adhesion of the liner void an area where the adhesive bond is broken or non-existent leaving a smooth and clean area on the metallic surface
3.6
Delivery batch
delivery batch consists of bushes bearing the same identity block although they may originate from different manufacturing batches SIST EN 2311:2012
EN 2311:2012 (E) 8 4 Required characteristics, inspection and test methods See Table 1. Table 1 Clause Characteristics Requirements Inspection and test method Q a A a 4.1 Materials In accordance with the product standards or design documentation Chemical analysis 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 boreb and of the outer diameter — Rings having a width of < 10 mm: in the median plane. — 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 points check on the width of each ring (distance between the two faces). 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 detrimental 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 4.6 Surface roughness Shall conform to product standards Suitable measuring instruments or visual tactile samples. X X 4.7 Static loads:
— radial: Cs — axial: Ca Shall conform to product standards With permissible static loads no maximum total deformations greater than those indicated in Table A.1. After removal of the loads, no permanent deformations greater than those indicated in Table A.1. See Annex A. X
(continued)SIST EN 2311:2012
EN 2311:2012 (E) 9 Table 1 (continued) Clause Characteristics Requirements Inspection and test method Q a A a 4.8 Ultimate loads: — radial — axial After removal of the loads
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