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 specificationBS EN
2、 4540:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 4540:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtaine
3、d on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 65443 5ICS 49.035Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedBS EN 4540:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4540 December 2011 ICS 49.035 English Ve
5、rsion 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 charge leve sous faibles oscillations - Spc
6、ification 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 members are bound to comply with the CEN/
7、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 Cent
8、re 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
9、 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
10、, 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 in any form and by any means reserved wor
11、ldwide for CEN national Members. Ref. No. EN 4540:2011: EBS EN 4540:2011EN 4540:2011 (E) 2 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 .
12、18Annex A (normative) Verification of permissible and ultimate static loads 24Annex B (normative) 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 cycle
13、s . 32Annex F (normative) Verification of dynamic radial loads (C250) 35Annex G (normative) Low friction coefficient . 38BS EN 4540:2011EN 4540:2011 (E) 3 Foreword This document (EN 4540:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN
14、). 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
15、 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 the possibility that some of the elements of this document may be the subject of
16、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,
17、 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 and the United Kingdom. BS EN 4540:2011EN 4540:
18、2011 (E) 4 1 Scope This European Standard specifies 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 swivel
19、ling and slow rotations only. This standard applies 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
20、120 C. The liner may be of a fabric or composite material 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 s
21、urface application. 2 Normative references The following 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 4
22、538-1, Aerospace series Bearings, spherical plain, 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-lubricat
23、ing liner Elevated load under low oscillations Narrow 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 ser
24、ies with low friction coefficient prEN 4539-1, Aerospace 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 corros
25、ion resisting steel with self-lubricating liner Elevated 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 -
26、 Dimensions and loads - Part 003: Inch series with 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 mechan
27、ical transmissions for airframe applications Vocabulary 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 o
28、f publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). BS EN 4540:2011EN 4540:2011 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 self-lubricated spheric
29、al 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 self-lubricating liner which is bonded or moulded on the spherical surface of the outer ring. The width of the inner ring i
30、s 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 grooves for mechanical swaging 3.2 surface discontinuities see TR 4475 3.3 starting torque without load see TR 4475 3.4
31、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; R inner spherical ball radius. 3.5 permissible radial static loads radial (Cs) this corresponds to a permissible unit pr
32、essure 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 documentation. The direction of the load shall remain in the center plane of the outer ring. The radial projected surfac
33、e 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 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
34、 an oscillating 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
35、each bearing 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 dy
36、namic radial 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 inte
37、rface on the metallic surface 3.8 delivery batch this consists of bearings with the same identity block, which may come from different production batches 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, ins
38、pection and test methods See Table 1. Table 1 Clause Characteristics Requirements Inspection and test methods Q aA b4.1 Materials Shall conform with the product standards or design documentation. Chemical analysis or certificate issued by semi-finished product manufacturer X X 4.2 Dimensions and tol
39、erances Shall conform with the product standards or design documentation. Dimensions not shown shall be at the manufacturers option. Suitable 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 par
40、allel to the outer faces and at a distance from these faces of twice the maximum value of the ring chamfer. The minimum and maximum diameters 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
41、 of four points. X X 4.3 Masses Shall conform with the product standards or design documentation. Suitable methods X 4.4 Marking Shall conform 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
42、 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 on their characteristics and endurance; the liner shall not contain contaminant products and shall not show broken or voided areas; lubrication shall not be perm
43、itted. X X Assembled bearings Visual inspection using suitable methods Unassembled rings Magnetic or dye penetrant inspection 4.6 Hardness Shall conform with the product standards or design documentation. Suitable processes and measuring instruments X X 4.7 Surface roughness Shall conform with the p
44、roduct 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
45、 able to move freely within the angular limits specified in the product standards or design documentation. Manual inspection X X continued BS EN 4540:2011EN 4540:2011 (E) 8 Table 1 (continued) Clause Characteristics Requirements Inspection and test methods Q aA b4.10 4.10.1 4.10.2 4.10.3 Starting to
46、rque without load at ambient temperature. Shall conform with the product standards or design documentation. Suitable processes and measuring instruments: Measurement of the starting torque shall be preceded by some rotations and a few turning movements by hand; Measure the torque, applied gradually
47、to the inner ring, in both directions, with the outer ring held stationary. Read off the maximal value required to start up the inner ring. X X at low temperature. Starting torque 2 times those listed in the product standards or design documentation. Subject the bearing, during 4 h at the minimum te
48、mperature 5 C; Immediately after, measure the torque following 4.10.1. X after limit temperatures. Shall conform with Tables 2 (a) and 2 (b). Subject the bearing during 1 h at the minimum temperature 5 C, then 1 h at the maximum temperature 2 C; Repeat successively 10 this test; 4 h after these test
49、s, measure the torque, at ambient temperature, following 4.10.1. X 4.11 Spherical surfaces conformity For bonded liners: Difference between the values measured normally to the spherical surfaces shall not exceed 0,08 mm. Encapsulate the bearing in plastic material as used in metallurgical mounts. Section the bearing following a diameter plane and polish the surfaces (se
