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STANDARD
SIST EN 3727:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3727June 2006ICS 49.035 English VersionAerospace series - Bearings, airframe rolling rigid with flangedalignment housing - Technical specificationSérie aérospatiale - Roulements pour structures d'aéronefsrigides, avec bague d'alignement à collerette - SpécificationtechniqueLuft- und 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 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, German). 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, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3727:2006: ESIST EN 3727:2009
EN 3727:2006 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Description.5 5 Requirements.5 6 Quality assurance.9 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)
Verification 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 – 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 procedure.32
SIST EN 3727:2009
EN 3727:2006 (E) 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 approval 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 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. According 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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 3727:2009
EN 3727:2006 (E) 4 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for airframe 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 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 3060, 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 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 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 inspection 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 Engineers, Inc. (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001 USA. SIST EN 3727:2009
EN 3727:2006 (E) 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 start 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 protected 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. SIST EN 3727:2009
EN 3727:2006 (E) 6 Table 1 — Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q a A b 5.1
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 manufacturer 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 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 circle 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 with 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 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 SIST EN 3727:2009
EN 3727:2006 (E) 7 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q a A b 5.6
Hardness In accordance with the product standard or design documentation Suitable processes and measuring instruments c X X 5.7
Surface roughness In accordance with the product standard or design documentation Suitable measuring instruments or visual-tactile samples c X 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 grease 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 correctly 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 other
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 Annex B X
5.11
Runout
5.11.1
Radial: Kia' Kea Axial: Sia' Sea In 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 SIST EN 3727:2009
EN 3727:2006 (E) 8 Table 1 (concluded) Clause Characteristic Requirement Inspection and test method Q a A b 5.12
Internal clearances – radial: Gr – axial: Ga In 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. 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.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 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: Fa max. In accordance with the product standard or design documentation After removing the loads, there shall be no permanent deformations. According 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 torque In accordance with the product standard or design documentation According to Annex G X X a Q: Qualification test b A: Acceptance test c This inspection shall be made in the absence of surface treatment which, for the purpose of qualification, may be removed by a chemical process. SIST EN 3727:2009
EN 3727:2006 (E) 9 6 Quality 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 bearings indicated in the product standard. To qualify a bearing of a given range, the manufacturer shall provide: nine bearings in the case of the first qualification in this range; seven bearings for all the other qualifications. 6.2 Acceptance conditions 6.2.1 Inspection and tests to be carried out by the manufacturer The acceptance of a delivery batch shall be in accordance with Table 4. 6.2.2 Purchaser's (user's) quality control The purchaser (user) may, on acceptance of a delivery batch, proceed to inspect it by using the inspections specified in Table 4, in full or in part, to ensure that the items conform to the required quality level and to determine whether the delivery batch is acceptable. This inspection may be carried out in the purchaser's (user's) factory, or, by special agreement in the manufacturer's factory. 7 Packaging The bearings shall be packaged individually so that they will not be damaged during transportation. They shall be protected against moisture, corrosion, dirt and other harmful substances. The packaging material in contact with these bearings shall provide this protection and be grease-resistant. The following indications shall figure on each individual package: manufacturer's name and address; identity block as defined by the product standards or the design documentation; packaging date; lubrication date. SIST EN 3727:2009
EN 3727:2006 (E) 10 At least the following indications shall appear on collective packaging: manufacturer's name and address; number of order; quantity; identity block(s) as defined by the product standards or design documentation. 8 Certificate of compliance All bearings supplied in accordance with this standard shall be accompanied by a certificate of compliance according to EN 10204 issued by the manufacturer for each production batch. Table 2 — Non destructive inspections and tests to be carried out for qualification Serial number of samples Types of inspections and tests a
Defined in subclause1 2 3 4 5 6 7 8 9 Materials 5.1 X X X X X X X X
Dimensions and tolerances 5.2 X X X X X X X
Masses 5.3 X X X X X X X
Marking 5.4 X X X X X X X X X Surface appearance (Assembled bearings) 5.5.1 X X X X X X X X X Surface treatment (if required) 5.8 X X X X X X X X X Retention of seals and shields 5.10.1
X X
Runout radial Kia, Kea; axial Sia, Sea 5.11.1 X X X X X X X
Radial runout of flange hole circle 5.11.2 X
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