1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2337 Edition P 2 May 2001 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION (AECMA-STAN) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 Will supersede EN 2337: 1996 ICs: Descriptors: ENGLISH
2、VERSION Aerospace series Spherical plain bearings Technical specification Srie arospatiale Rotules lisse Spcification technique Luft- und Raumfahrt Gelenklager Technische Lieferbedingungen This %Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Asso
3、ciation of Aerospace Industries - Standardization). It is published on green paper for the needs of the European Aerospace industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical con
4、tent shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN it will be submitted as a draft European Standard to CEN (European Committee for
5、 Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX I I Edition approved for publication I Comments should be sent within six months I 2001-05-31 after the date of publication to Gulled
6、elle 94 AECMA-STAN 8-1200 BRUXELLES Mechanical Domain Mr Feltham aecma 2001 Page 3 prEN 2337: 2001 1 Scope This standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for spherical plain bearings designed to withstand static loads and lo
7、ads with slight swivelling. It is applicable whenever referenced. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed
8、hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 2000 EN 2335 EN 2336 EN 258
9、8 EN 3042 EN 4265 EN 4266 EN 6046 EN 10204 TR 4475 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Aerospace series - Bearings-spherical plain in corrosion resisting steel without assembly slot - Dimensions and loads Aerospace series - B
10、earings-spherical plain in steel with assembly slots - Dimensions and loads Aerospace series - Bearings-spherical plain in corrosion resisting steel with assembly slots - Dimensions and loads Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Be
11、arings, spherical plain in corrosion resisting steel - Wide series - Dimensions and loads - Inch series ) Aerospace series - Bearings, spherical plain in corrosion resisting steel, cadmium plated - Wide series - Dimensions and loads - Inch series ) Aerospace series - Bearings, spherical plain, in co
12、rrosion resisting steel - Narrow series - Dimensions and loads - Inch series ) Metallic products - Types of inspection documents Aerospace series - Bearings and mechanical transmissions for airframe applications - Vocabulary *) 3 Defini tio ns For the purposes of this standard, the following definit
13、ions given in TR 4475 apply. 4 See table 1. Required characteristics, inspection and test methods 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published as AECMA Technical Report at the date of publication of this standard C haracteristics Requirements 4.6 4.7 Har
14、dness In accordance with the product standards or design documentation Surface In accordance with the roughness product standards or design documentation Page 4 prEN 2337: 2001 8 O e Table 1 Subclause Ab - X Inspection and test methods Materials In accordance with the product standards or design doc
15、umentation Chemical analysis or certifi- cate 2.1 according to EN 10204 issued by semi-finished products manufacturer Dimensions In accordance with the product standards or design documentation Suitable measuring instruments Measurement of bore and outer diameter: - Rings with a width of I 10 mm: in
16、 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
17、 (distance between the two faces) is verified at a minimum of four points. X X 4.2 Suitable methods X Masses In accordance with the product standards or design documentation 4.4 Marking In accordance with the product standards or design documentation. It shall be legible and shall not adversely affe
18、ct the material or the functioning of the bearing. Visual examination X - X - Surface appearance The bearing shall be free of surface discontinuities liable to have an adverse effect on their charac- teristics and endurance. Assembled spherical bearings Visual examination using suitable methods X X
19、Magnetic or dye penetrant inspection X X 4.5.2 Unassembled rings Suitable processes and measuring instruments X X Suitable measuring instruments or visual-tactile samples X - X Page 5 prEN 2337: 2001 In accordance with the product standards or design documentation Table 1 (concluded) SeeannexA 5ubcl
20、ause 4.1 2 4.8 - axial: Ca Ultimate static loads: - radial - axial 4.9 4.1 O Characteristics Lubrication Internal clearance: - radial - axial Be haviou r in rotation and sw ive I I i ng 4.1 1 Permissible static loads: - radial: C, a Q: Qualification test A: Acceptance test Requirements In accordance
21、 with the product standards or design documentation. The dry lubricant shall be compatible with the code A or code B grease (see annex C) which may be used in accordance with the product standards or design documentation. Inspection and test methods Visual inspection Suitable method The bearings sha
22、ll be able to move freely within the angular limits specified in the product standards or design documentation for swivelling. Manual inspection In accordance with the product standards or design documentation After the removal of the loads, no permanent deformations 0,07 mm After the removal of the
23、 loads, no permanent deformations 0,l O mm After the removal of the loads, there shall be no cracks or deterioration of the bearing See annex B See annex B - Q“ X - X - X - X X - - Ab - X X X - 5 Quality assurance 5.1 Product qualification According to EN 3042 and tables 2 and 3 and annex D. Qualifi
24、cation shall be obtained for each bearing. However, “de facto“ qualification of a bearing 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. Page 6 prEN 2337: 200
25、1 Types of inspections and tests a Materials Dimensions Mass 5.2 Acceptance conditions 5.2.1 See table 4. Inspections and tests to be carried out by the manufacturer Serial number of samples I 2 3 4 5 4.1 X X X X X 4.2 X X X X X 4.3 X X X X X Defined in subclause 5.2.2 Purchasers (users) quality con
26、trol The purchaser (user) may, on acceptance of a delivery batch, proceed to inspect it by using the inspections specified in table4, 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
27、carried out in the purchasers (users) factory, or, by special agreement, in the manufacturers factory. Marking 6 Packaging 4.4 1x1 XI XI XI X The bearings shall be packaged either individually or in rolls so that they will not be damaged during transportation. They shall be protected against moistur
28、e, corrosion, dirt and other harmful substances. The packaging material in contact with the bearing shall provide this protection and be grease-resistant. The following indications shall be affixed to each individual package: - manufacturers name and address; - quantity (for rolls); - identity block
29、 as defined by product standards or design documentation; - packaging date; - lubrication date. The following indications at least shall appear on collective packaging: Hardness manufacturers name and address; number of order; quantity; identity block(s) as defined by the product standards or design
30、 documentation. 4.6 1x1 - - - - Certificate of compliance Surface roucihness All the 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 inspection
31、s and tests to be carried out for qualification 4.7 1x1 - - - - Lubrication 4.8 1x1 XI XI XI X Internal clearances Behaviour in rotation and swivelling 4.9 X X X X X 4.1 O X X X X X Page 7 prEN 2337: 2001 Table 3 - Destructive inspections and tests to be carried out for qualification Defined insubcl
32、ause Types of inspections and tests a Serial number of samples 1 I 21 31 41 5 permissible (C,) radial Test under ultimate static load permissible (Ca) axial ultimate Table 4 - Inspections and tests to be carried out for acceptance - 4.1 1 - X X X 4.12 X X X 4.1 1 - X X X - - - X X 4.12 - - - Types o
33、f inspections and tests a Marking Assembled spherical bearings Unassembled rings Surface appearance Sampling pian b,c Defined in subclause I I 4.4 100 % 4.5.1 4.5.2 Materials Hardness Surface roughness 4.1 4.6 5%d 4.7 5%d Chemical analysis or certificate 2.1 according to EN 10204 issued by semi-fini
34、shed product manufacturer. Lubrication Internal clearance Dimensions 1 4.2 I 4.8 100 % 4.9 10 % Behaviour in rotation and swivelling 4.10 100 % Page 8 prEN 2337: 2001 Annex A (normative) Verification of internal clearance A.l Radial internal clearance A.l .I Principle According to figure A.1, as an
35、example. A.1.2 Method - Mount the bearing vertically and immobilize the inner ring (in the case of a bearing with assembly slots, the direction of application of the load shall be at 90“ to the slot centre line). - Place a dial gauge in the radial plane of the bearing. - Apply the load f (see table
36、A.l) in the direction of the dial gauge and then in the opposite direction. - Record the values. - Repeat this measurement in different angular positions by rotating the outer ring in relation to the inner ring. a Key 1 Dial gauge 2 Bearing Fig u re A. 1 Table A.l Nominal diameter F max. 20 1 O0 Pag
37、e 9 prEN 2337: 2001 Nominal diameter mm I A.2 Axial internal clearance A.I.1 Principle According to figure A.2, as an example. I F max. N A.1.2 Method 2 20 20 Mount the bearing horizontally and immobilize the outer ring. Place a dial gauge in the axis of the bearing. Apply the load F (see table A.2)
38、 in the direction of the dial gauge and then in the opposite direction. Record the values. Repeat this measurement in different angular positions by rotating one ring in relation to the other. 50 1 O0 Key 1 Dial gauge 2 Bearing Fig u re A.2 Table A.2 Page 10 prEN 2337: 2001 Annex B (normative) Verif
39、ication of permissible and ultimate static loads B.l Permissible radial static load (C,) B.1 .I Principle According to figure B.1, as an example. B.I.2 Method - Mount the bearing as shown in figure B.1. - Apply a radial pre-load equal to 5 % of C, for 15 s. - Set the dial gauge to zero. - Increase t
40、his pre-load progressively by 1 % per s until C, is obtained. - Maintain the load C, for 3 min. - Reduce it progressively by 1 % pers to the pre-load value. - Read off the value of the permanent deformation indicated by the dial gauge. - Remove the pre-load. - Repeat this operation after rotating on
41、e ring by 180“ in relation to the other. B.2 Ultimate radial static load This test follows that specified in B.1. B.2.1 Principle According to figure 8.1, as an example. B.2.2 Method - Mount the bearing as shown in figure B.1. - Apply a radial load of 13 C,. - Remove the load. - Check the bearing. B
42、.3 Permissible axial static load (C,) B.3.1 Principle According to figure B.2, as an example. Page 11 prEN 2337: 2001 d B.3.2 Method - Mount the bearing as shown in figure B.2. - Apply an axial pre-load equal to 5 % of Ca for 15 s. - Set the dial gauge to zero. - Increase this pre-load progressively
43、 by 1 % per s until Ca is obtained. - Maintain the load Ca for 3 min. - Reduce it progressively by 1 % pers to the pre-load value. - Read off the value of the permanent deformation indicated by the dial gauge. - Remove the pre-load. - Repeat this operation after rotating one ring by 180“ in relation
44、 to the other. B.4 Ultimate axial static load This test follows that specified in 8.3. 6.4.1 Principle According to figure 6.2, as an example. B.4.2 Method - Mount the bearing as shown in figure B.2. - Apply an axial load of 13 Ca. - Remove the load. - Check the bearing. 1 Page 12 prEN 2337: 2001 Ke
45、y 1 2 Frame 40 HRc min. 3 Bearing a See product standard Width of bearing inner ring + 0,l O rnm Key + 0,025 mm 1 Clearance o 2 Mandrel 4 5 Dial gauge 6 Clearance o 7 Pin in steel 50 HRc min +0,025 mm Test ring 50 HRc min. Figure B.l I; 4 3 Bearing 4 support 5 Dialgauge Figure B.2 Page 13 prEN 2337:
46、 2001 Annex C (norma tive) Lubricants - Essential characteristics c.1 Type: Synthetic + gelling agent + extreme pressure additives Dropping point: Shall not be below 163 OC Worked penetration: 270 mm to 310 mm Limits of use: - 73 OC to 121 OC Ester type extreme pressure grease, code A c.2 Type: Synt
47、hetic + high melting point gelling agent Dropping point: Shall not be below 232 OC. Worked penetration: 265 mm to 320 mm Limits of use: - 54 OC to 177 “C. Synthetic hydrocarbon grease, code B Page 14 prEN 2337: 2001 Group Bearing with assembly slots Bearing with swaging outer ring 1 2 Annex D (norma
48、 tive) Subgroup Standard Type number IA steel EN 2336 1B narrow EN 2588 28 EN 2335 bearing material CRES Simplified qualification procedure D.l Rules for application This procedure which is based on experience acquired between suppliers and users will only be applicable to manufacturers of airframe
49、bearings who at least meet the following criteria: D.I.1 qualified. Be holder of an approval according to EN 2000 on all production sites for the products to be D.1.2 Be a manufacturer who is well established in terms of his manufacturing facilities and be one who has supplied established airframe bearings to European prime users for a number of years to National or Company aerospace standards and has obtained qualification to this standard or has significant statistical quality data (analytical data) for those products that produce
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