1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 4540:2011Aerospace series Bearings,spherical plain, in corrosionresisting steel with self-lubricating liner elevatedload under low oscillations Technical specificationCopyr
2、ight European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 4540:2011.The UK participation in
3、 its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are re
4、sponsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 65443 5ICS 49.035Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 Janu
5、ary 2012.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
6、4540 December 2011 ICS 49.035 English Version Aerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations - Technical specification Srie Arospatiale - Rotules, en acier rsistant la corrosion garniture autolubrifiante cha
7、rge leve sous faibles oscillations - Spcification technique Luft- und Raumfahrt - Gelenklager aus korrosionsbestndigem Stahl mit selbstschmierender Beschichtung, hohe Belastung bei geringer Drehbewegung - Technische Lieferbedingungen This European Standard was approved by CEN on 24 March 2011. CEN m
8、embers 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 applic
9、ation 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 Mana
10、gement 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, Nether
11、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation i
12、n any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4540:2011: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 2
13、 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions . 54 Required characteristics, inspection and test methods 75 Quality assurance 176 Packaging . 187 Certificate of conformity . 18Annex A (normative) Verification of permissible and ultimate static loads 24Annex B (nor
14、mative) Verification of dynamic radial loads (C25) . 28Annex C (normative) Fluids Essential characteristics 30Annex D (normative) Measurement of the peel strength of the liner . 31Annex E (normative) Duty cycles . 32Annex F (normative) Verification of dynamic radial loads (C250) 35Annex G (normative
15、) Low friction coefficient . 38Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 3 Foreword This document (EN 4540:2011) has been prepared by the Ae
16、rospace 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, pr
17、ior 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 June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. Attention is drawn to t
18、he 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 coun
19、tries 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, Slov
20、enia, Spain, Sweden, Switzerland and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 4 1 Scope This European Standard specifie
21、s the required characteristics, inspection and test methods, qualification and acceptance conditions for spherical plain bearings in corrosion resisting steel, self aligning with self-lubricating liner designed to withstand (under load) slight swivelling and slow rotations only. This standard applie
22、s whenever referenced. These bearings prEN 4538-1, prEN 4538-2, prEN 4539-1 and prEN 4539-2 are for actuator applications and for use in the temperature range 54 C to 163 C and for EN 4538-003 and EN 4539-003 for use in the temperature range 54 C to 120 C. The liner may be of a fabric or composite m
23、aterial bonded to the inside diameter of the outer ring or in a composite material moulded into a pre-formed cavity between the inner and outer rings. The duty cycle (Annex E, normative) has been established on the basis of a civil aircraft aileron surface application. 2 Normative references The fol
24、lowing referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. prEN 4538-1, Aerospace series Bearings, spherical plain,
25、 in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Narrow series Dimensions and loads Metric series 1)prEN 4538-2, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Nar
26、row series Dimensions and loads Inch series 1)EN 4538-003, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations Narrow series Dimensions and loads Part 003: Inch series with low friction coefficient prEN 4539-1, Aer
27、ospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner Elevated load under low oscillations Wide series Dimensions and loads Metric series 1)prEN 4539-2, Aerospace series Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner El
28、evated load under low oscillations Wide series Dimensions and loads Inch series 1)EN 4539-003, Aerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations - Wide series - Dimensions and loads - Part 003: Inch series with
29、 low friction coefficient EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts ISO 11078, Aircraft De-icing/anti-icing fluids, ISO types II, III and IV TR 4475, Aerospace series Bearings and mechanical transmissions for airframe applications Vocab
30、ulary 2)1) Published as ASD-STAN Prestandard at the date of publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). 2) Published as ASD-STAN Technical report at the date of publication of this standard by Aerospace and De
31、fence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 5 3 Terms a
32、nd definitions For the purposes of this document, the following terms and definitions apply. 3.1 self-lubricated spherical plain bearings, self-aligning in corrosion resistant steel with staking groove for actuator applications these consist of two concentric rings, between which is interposed a sel
33、f-lubricating liner which is bonded or moulded on the spherical surface of the outer ring. The width of the inner ring is greater than the width of the outer ring, so that a tilting movement is possible in addition to the rotational movement. The outer ring has no assembly slot. This outer ring has
34、grooves for mechanical swaging 3.2 surface discontinuities see TR 4475 3.3 starting torque without load see TR 4475 3.4 friction coefficient the friction coefficient of the bearing under load is given by the following formula: = FRCwhere friction coefficient; C torque moment; F load on the bearing;
35、R inner spherical ball radius. 3.5 permissible radial static loads radial (Cs) this corresponds to a permissible unit pressure multiplied by the projected surface area, the inner ring being able to take any position within the limits of the tilting angle indicated in the product standards or design
36、documentation. The direction of the load shall remain in the center plane of the outer ring. The radial projected surface area is given by the following formula: Ar= K (C min. 2 T max.) Where the dimensions shown in Figure 1 are as given in the appropriate product standard Copyright European Committ
37、ee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 6 Figure 1 3.6 dynamic radial load (oscillatory duty cycles) load which may be withstood by a bearing submitted to an oscill
38、ating movement following a given number and frequency of cycles, without the wear of the self-lubricating liner exceeding the values given in this standard 3.6.1 oscillating duty cycles are defined in Annex E. The table defines unit pressure applied. The dynamic radial load is defined for each beari
39、ng size by multiplying the unit pressure by the projected surface area, see dimensional standard 3.6.2 dynamic radial load C25one 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 25 to 0 3.6.3 dynamic radi
40、al load C250one 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 25 to 0 3.7 adhesion of the liner - Void area where the adhesive bond is broken or non-existent and leaves a smooth and clean interface on t
41、he metallic surface 3.8 delivery batch this consists of bearings with the same identity block, which may come from different production batches Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license
42、 from IHS-,-,-BS EN 4540:2011EN 4540:2011 (E) 7 3.9 ultimate static loads is equivalent to 1,5 times the permissible static load 4 Required characteristics, inspection and test methods See Table 1. Table 1 Clause Characteristics Requirements Inspection and test methods Q aA b4.1 Materials Shall conf
43、orm with the product standards or design documentation. Chemical analysis or certificate issued by semi-finished product manufacturer X X 4.2 Dimensions and tolerances Shall conform with the product standards or design documentation. Dimensions not shown shall be at the manufacturers option. Suitabl
44、e measuring instruments Measurement of bore and outer diameter: rings with a width of 10 mm: in the center plane; rings with a width of 10 mm: in two planes parallel to the outer faces and at a distance from these faces of twice the maximum value of the ring chamfer. The minimum and maximum diameter
45、s 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. X X 4.3 Masses Shall conform with the product standards or design documentation. Suitable methods X 4.4 Marking Shall confo
46、rm with the product standards 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 4.5.1 4.5.2 Surface appearance the bearings shall be free of surface discontinuities liable to have an adverse effect o
47、n their characteristics and endurance; the liner shall not contain contaminant products and shall not show broken or voided areas; lubrication shall not be permitted. X X Assembled bearings Visual inspection using suitable methods Unassembled rings Magnetic or dye penetrant inspection 4.6 Hardness S
48、hall conform with the product standards or design documentation. Suitable processes and measuring instruments X X 4.7 Surface roughness Shall conform with the product standards or design documentation. Suitable measuring instruments or visual-tactile samples X X 4.8 Surface treatment Shall conform with the product standards or design documentation. Visual inspection; As per surface treatment standard. X X 4.9 Behaviour inrotation and tilt Bearings shall be able to move freely
