EN 3280:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.]DKWHYHLuft- und Raumfahrt - Flugwerklager Wälzlager, Rillenkugellager oder Pendellager - Technische LieferbedingungenSérie aérospatiale - Roulements pour structure d’aéronefs, rigides ou à rotule - Spécification techniqueAerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 3280:2011SIST EN 3280:2011en,fr,de01-oktober-2011SIST EN 3280:2011SLOVENSKI
STANDARDSIST EN 3280:20011DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3280
May 2011 ICS 49.035 Supersedes EN 3280:1994English Version
Aerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification
Série aérospatiale - Roulements pour structure d'aéronefs, rigides ou à rotule - Spécification technique
Luft- und Raumfahrt - Flugwerklager Wälzlager, Rillenkugellager oder Pendellager - Technische Lieferbedingungen This European Standard was approved by CEN on 17 March 2011.
CEN members 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 application 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 Management 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3280:2011: ESIST EN 3280:2011

Retention test for self-aligning bearing seals and shields . 11Annex B (normative)
Sand and dust test . 13Annex C (normative)
Test on the running behaviour of the bearings, retention of seals and shields at the limit temperatures. 14Annex D (normative)
Verification of running accuracy . 15Annex E (normative)
Verification of internal clearances . 18Annex F (normative)
Verification of permissible and ultimate static loads. 23Annex G (normative)
Lubricants – Essential characteristics . 28Annex H (normative)
Simplified qualification procedure . 29Bibliography . 34SIST EN 3280:2011

in corrosion resisting steel — Diameter series 8 and 9, reduced internal radial clearance — Dimensions and loads EN 4034, Aerospace series — Bearings, airframe rolling — Double row self-aligning ball bearings with flanged outer ring in corrosion resisting steel, reduced internal radial clearance — Dimensions and loads EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defence Organizations EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts ISO 1132-1:2000, Rolling bearings — Tolerances — Part 1: Terms and definitions 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 rolling bearings, rigid or self-aligning 3.1.1 general these bearings have a full complement of balls or rollers 3.1.2 shielded rolling bearing bearing whose rolling elements and raceways are protected with shields attached to one of the rings and separated from the other by a small space 3.1.3 sealed rolling bearing bearing whose rolling elements and raceways are completely enclosed by seals attached to one of the rings and rubbing on the other SIST EN 3280:2011

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 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 In accordance with the product standards or design documentation. Suitable methods X
4.4 Marking In accordance 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
Surface appearance No surface discontinuities liable to have an adverse effect on their characteristics and endurance.
X X 4.5.1
Assembled bearings
Visual inspection using suitable methods
4.5.2
Unassembled rings Magnetic or dye penetrant inspection
4.5.3
Rolling element See 4.5.1. Rolling element must be supplied with certificate of conformity. X X 4.6 Hardness In accordance with the product standards or design documentation. Suitable processes and measuring instruments c
X X 4.7 Surface roughness In accordance with product standards or design documentation. Suitable measuring instruments or
visual-tactile samples c X X 4.8 Surface treatment In accordance with product standards or design documentation. - Visual inspection - As per surface treatment standard X X 4.9 Lubrication At least 80 % of the free space in the bearing shall be charged with the grease specified in the product standards or design documentation (see Annex G). Visual inspection after removal of seals or shields X
Visual inspection during manufacture
X 4.10 Seals (for sealed bearings) and shields (for shielded bearings)
continued SIST EN 3280:2011
A b
4.10.1 Retention All bearings: - The seals and shields shall be fitted correctly on the outer ring, in such a way that the functioning of the bearing is not affected. Visual inspection X X Self-aligning bearings: - After the test, the seals and shields shall not have loosened or become deformed. See Annex A. 4.10.2
Sealing The seals shall: rub on the inner ring and retain the grease Visual inspection after the rings are manually turned in relation to each other. X X
The seals shall: prevent the penetration of foreign bodies. After the test, the running behaviour of the bearings shall conform with 4.13.1. See Annex B. X
4.10.3
Temperature test After the test, the behaviour shall conform with 4.10.1. See Annex C. X
4.11 Running accuracy: - radial: Kja Kea - axial: Sia Sea In accordance with the product standards or design documentation. See Annex D. X X 4.12 Internal clearances: - radial: Gr - axial: Ga - diagonal: Gd In accordance with the product standards or design documentation. See Annex E. X X 4.13
Behaviour in rotation
4.13.1
At ambient temperature
No tights spots, e.g.: rolling elements catching in the filling slots See Figures F.2 and F.4. X X 4.13.2
At limit temperatures After the test, the mean starting torque shall not exceed 1,5 times the mean of the values recorded before the test. See Annex C. X
No tight spots See Figures F.2 and F.4.
4.14 Starting torques without load In accordance with the product standards or design documentation. Suitable procedures and measuring instruments X X
- Rotate one of the two ring at least four times to distribute the lubricant uniformity
- Measure at least five times the torque gradually applied to the outer ring, with the inner ring held stationary. Just the highest value shall be taken into account
4.15 Permissible static loads:
In accordance with the product standard or design documentation. See Annex F. X
- radial: Cs - axial: Fa max. After removing the loads, there shall be no permanent deformations.
4.16 Ultimate static loads: After the removal of the loads, there shall be no cracks or deterioration of the bearing. See Annex F. X
- radial
- axial 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 3280:2011
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