1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58housing Technical specification The European Standard EN 3727:2006 has the status of a British Stan
2、dardICS 49.035Bearings, airframe rolling rigid with flanged alignment BRITISH STANDARD AEROSPACE SERIESBS EN3727:2006BS EN 3727:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48434 3Cross-referencesThe Bri
3、tish Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards On
4、line.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an insi
5、de front cover, the EN title page, pages 2 to 34, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can b
6、e obtained on request to its secretary. present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThi
7、s British Standard is the official English language version of EN 3727:2006. The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: aid enquirers to understand the text;EUROPEAN STANDARDNORME EU
8、ROPENNEEUROPISCHE NORMEN 3727June 2006ICS 49.035English VersionAerospace series - Bearings, airframe rolling rigid with flangedalignment housing - Technical specificationSrie arospatiale - Roulements pour structures daronefsrigides, avec bague dalignement collerette - SpcificationtechniqueLuft- und
9、Raumfahrt - Flugwerklager Rillenkugellager mitselbsteinstellendem Flansch - TechnischeLieferbedingungenThis European Standard was approved by CEN on 20 April 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard
10、 the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, Germa
11、n). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark
12、, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUR
13、OPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3727:2006: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .
14、5 4 Description .5 5 Requirements.5 6 Quality assurance9 7 Packaging.9 8 Certificate of compliance . 10 Annex A (normative) Sand and dust test . 13 Annex B (normative) Test on the running behaviour of the bearing and performances of seals and shields at temperature limits 14 Annex C (normative) Veri
15、fication of radial and axial runout on the bearing without flange alignment housing 15 Annex D (normative) Verification of internal clearances on the bearing without flanged alignment housing 19 Annex E (normative) Verification of permissible ultimate static loads. 22 Annex F (normative) Lubricants
16、Basic characteristics . 28 Annex G (normative) Verification of the tilting torque of the bearing in the flanged housing . 29 Annex H (normative) Test of the radial runout for the hose circle-bearing fit and of the flanged housing spherical diameter. 30 Annex I (normative) Simplified qualification pr
17、ocedure. 32 EN 3727:2006 3 Foreword This European Standard (EN 3727:2006) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the ap
18、proval of the National Associations and the Official Services of the member countries of AECMA, 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 December 2006, and
19、 conflicting national standards shall be withdrawn at the latest by December 2006. 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. Acc
20、ording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithu
21、ania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3727:2006 4 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for airfra
22、me bearings with flanged alignment housing. This standard applies whenever referenced. 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
23、 the referenced document (including any amendments) applies. ISO 1132-1, Rolling bearings Tolerances Part 1: Terms and definitions. EN 3059, Aerospace series Bearings, airframe rolling Rigid single row ball bearings in steel with flanged alignment housing, cadmium plated Dimensions and loads. EN 306
24、0, Aerospace series Bearings, airframe rolling Rigid single row ball bearings in steel, cadmium plated, with flanged alignment housing, cadmium plated Dimensions and loads. EN 3061, Aerospace series Bearings, airframe rolling Rigid single row ball bearings in corrosion resisting steel, with flanged
25、alignment bush Dimensions and loads. EN 4041, Aerospace series Bearings, airframe rolling Rigid single row ball bearings in corrosion resisting steel, with extended inner ring and flanged alignment bush Dimensions and loads. EN 9100, Aerospace series Quality management systems Requirements (based on
26、 ISO 9001:2000) and Quality systems Model for quality assurance in design, development, production, installation and servicing (based on ISO 9001:1994). EN 9133, Aerospace series Quality management systems Qualification Procedure for aerospace standard parts. EN 10204, Metallic products Types of ins
27、pection documents. TR 4475, Aerospace series Bearings and mechanical transmissions for airframe applications Vocabulary. 1)AS7949, Bearing, ball, airframe, antifriction. 2)1) Published as AECMA Technical Report at the date of publication of this standard. 2) Published by: Society of Automotive Engin
28、eers, Inc. (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001 USA. EN 3727:2006 5 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in ISO 1132-1 or TR 4475 and the following apply. 3.1 starting torque without load maximum torque required to st
29、art the rotation of the outer ring with the inner ring held stationary 4 Description 4.1 General These bearings are full complement ball bearings. They are mounted in a flanged alignment housing with mounting bolt holes. 4.2 Shielded bearing A bearing of which the rolling elements and raceways are p
30、rotected with shields attached to one of the rings and separated from the other by a small space. 4.3 Sealed bearing A bearing of which the rolling elements and raceways are completely enclosed by seals attached to one of the rings while sliding on the other one. 5 Requirements See Table 1. EN 3727:
31、2006 6 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q aA b5.1 Material In accordance with the product standard or design documentation Chemical analysis or certificate 2.1 according to EN 10204 issued by the semi-finished product manufa
32、cturer X X 5.2 Dimensions, tolerances In accordance with the product standard or design documentation Suitable measuring instruments Measurement of bore and outer diameter: Rings with a width of 10 mm: in the centre plane Rings with a width of 10 mm: in two planes parallel to the outer faces and at
33、a distance from these faces of twice the maximum value of the ring chamfer. The minimum and maximum diameters are determined in each measuring plane Measurement of ring width: The width of each ring (distance between the two faces) is verified at a minimum of four points. Measurement of the pitch ci
34、rcle diameter of the mounting holes: Measurement of holes with a tightly secured gauge, so that the flange can be verified in any position Measurement of flatness of flange X X 5.3 Masses In accordance with the product standard or design documentation Suitable methods X 5.4 Marking In accordance wit
35、h the product standard or design documentation It shall be legible and shall not adversely affect the material or the operation of the airframe bearing. Visual examination X X 5.5 Surface appearance 5.5.1 Assembled bearings Visual inspection of the mounted airframe bearings using suitable methods X
36、X 5.5.2 Unassembled rings and balls The bearings shall be free of surface discontinuities liable to have an adverse effect on their characteristics and endurance. Magnetic or dye penetrant inspection of rings and balls and of the flanged housing X X continued EN 3727:2006 7 Table 1 (continued) Claus
37、e Characteristic Requirement Inspection and test method Q aA b5.6 Hardness In accordance with the product standard or design documentation Suitable processes and measuring instruments cX X 5.7 Surface roughness In accordance with the product standard or design documentation Suitable measuring instru
38、ments or visual-tactile samples cX X 5.8 Surface treatment In accordance with the product standard or design documentation Visual inspection In accordance with the standard on surface treatment X X 5.9 Lubrication At least 80 % of the free space in the airframe bearing shall be filled with the greas
39、e specified in the product standards or design documentation (see Annex F). Visual examination after removal of seals and shields Visual inspection during manufacture X X 5.10 Seals (for sealed bearings) and shields (for shielded bearings) 5.10.1 Retention The seals and shields shall be fitted corre
40、ctly on the outer ring, in such a way that operation of the bearing is not affected. Visual inspection X X 5.10.2 Sealing 5.10.2.1 against grease leakage The seals shall slide on the inner ring and retain the grease. Visual inspection after the rings have been manually turned in relation to each oth
41、er 5.10.2.2 against penetration of foreign bodies The seals prevent the penetration of foreign bodies. After the test, the running behaviour of the bearings shall conform with 5.10.1. According to Annex A X 5.10.3 Temperature test After the test, the behaviour shall conform with 5.10.1 According to
42、Annex B X 5.11 Runout 5.11.1 Radial: KiaKeaAxial: SiaSeaIn accordance with the product standard or design documentation According to Annex C X X 5.11.2 Radial runout of flange hole circle In accordance with the product standard or design documentation According to Annex H X X continued EN 3727:2006
43、8 Table 1 (concluded) Clause Characteristic Requirement Inspection and test method Q aA b5.12 Internal clearances radial: Gr axial: GaIn accordance with the product standard or design documentation According to Annex D X X 5.13 Behaviour in rotation 5.13.1 At ambient temperature No tight spots, e.g.
44、 rolling elements catching in the filling slots According to Annex E Figures E.2 and E.4 X X 5.13.2 At extreme temperatures After the test, the mean starting torque shall not exceed 1,5 times the mean value recorded before the test.According to Annex B X No tight spots According to Figures E.2 and E
45、.4 5.14 Starting torques without load In accordance with the product standard or design documentation Suitable measuring instruments and procedures Rotate one of the two rings at least four times to distribute the lubricant uniformly; Measure the torque gradually applied to the inner ring, at least
46、five times with the flange of the housing held in place; The highest value shall be taken into account. X X 5.15 Permissible static loads: radial: Cs axial: Famax.In accordance with the product standard or design documentation After removing the loads, there shall be no permanent deformations. Accor
47、ding to Annex E X 5.16 Ultimate static loads 5.16.1 Radial After the removal of the loads, no cracks or deterioration of the airframe bearing According to Annex E X 5.16.2 Axial When this load is applied, the ball bearing shall not be pushed out of the flange. According to Annex E X 5.17 Tilting tor
48、que In accordance with the product standard or design documentation According to Annex G X X aQ: Qualification test bA: Acceptance test cThis inspection shall be made in the absence of surface treatment which, for the purpose of qualification, may be removed by a chemical process. EN 3727:2006 9 6 Q
49、uality assurance 6.1 Product qualification See EN 9133 and Tables 2 and 3 and Annex I. Qualification shall be obtained for each bearing. However, qualification: for a cadmium plated bearing applies to a non cadmium plated bearing with the same dimensions and of the same type, made of the same material; is acquired if it has been obtained for the bearing immediately before and the one immediately after the bearing in question, within the range of bea
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