SIST EN 4540:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VSHFLILNDFLMDLuft- und Raumfahrt - Gelenklager aus korrosionsbeständigem Stahl mit selbstschmierender Beschichtung, hohe Belastung bei geringer Drehbewegung - Technische LieferbedingungenSérie Aérospatiale - Rotules, en acier résistant à la corrosion à garniture autolubrifiante à charge élevée sous faibles oscillations - Spécification techniqueAerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations - Technical specification49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 4540:2011SIST EN 4540:2012en,de01-februar-2012SIST EN 4540:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4540
December 2011 ICS 49.035 English Version
Aerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations - Technical specification
Série Aérospatiale - Rotules, en acier résistant à la corrosion à garniture autolubrifiante à charge élevée sous faibles oscillations - Spécification technique
Luft- und Raumfahrt - Gelenklager aus korrosionsbeständigem 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/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 4540:2011: ESIST EN 4540:2012

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 cycles . 32Annex F (normative)
Verification of dynamic radial loads (C250) . 35Annex G (normative)
Low friction coefficient . 38 SIST EN 4540:2012

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 corrosion 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 - 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 mechanical 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 of publication of this standard by Aerospace and Defence Industries Association of Europe-Standardization (ASD-STAN), (www.asd-stan.org). SIST EN 4540:2012

Figure 1 3.6 dynamic radial load (oscillatory duty cycles) load which may be withstood by a bearing submitted to 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 each bearing size by multiplying the unit pressure by the projected surface area, see dimensional standard 3.6.2 dynamic radial load C25 one 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 dynamic radial load C250 one 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 interface on the metallic surface 3.8 delivery batch this consists of bearings with the same identity block, which may come from different production batches SIST EN 4540:2012

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 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 permitted.
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 product 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 in rotation and tilt Bearings shall be able to move freely within the angular limits specified in the product standards or design documentation. Manual inspection X X continued SIST EN 4540:2012

4.10.1
4.10.2
4.10.3 Starting torque 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 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 temperature ± 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 tests, 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 (see Figure 2). By use of an optical comparator, for example, measure dimension "t" at a minimum of five uniformly spaced positions across the bearing (see Figure 2) on both opposite surfaces. The selected points shall include the middle position of the bearing at the C/10 positions. X
For injected/moulded liners: the maximum thickness of the liner shall be located between the C/10 positions. The minimum thickness shall be 0,2 mm. Encapsulate the bearing in plastic material as used in metallurgical mounts. Section the bearing following a diameter plane and polish the surfaces
By use of an optical comparator, for example, measure dimension "t" at a minimum of five uniformly spaced positions across the bearing (see Figure 2) on both opposite surface. The selected points shall include the middle position of the bearing at the C/10 positions. X
4.12 Permissible static loads: – radial: Cs; – axial: Ca. Shall conform with the product standards or design documentation. No maximum total deflection greater than those listed in Tables 3 (a) and 3 (b) under permissible static loads (Cs). After removing the loads, no permanent deformations greater than those listed in Tables 3 (a), 3 (b) and 3 (c). See Annex A. X
4.13 Ultimate static loads: – radial; – axial. After the removal of the loads, there shall be no cracks, no push out of the inner ring or deterioration of the bearing. See Annex A. X
continued SIST EN 4540:2012
At the end of this test, the starting torque under radial load shall be measured and shall conform with values listed in Tables 5 (a), 5 (b) and 5 (c). Suitable processes and measuring instruments
4.14 B Dynamic radial loads C250:
for EN 4538-003 and
EN 4539-003 – at low temperature;
– at high temperature. Shall conform with the product standards or design documentation. After the removal of the loads:
– No metal-to-metal contact between inner and outer ring;
– The liner wear shall not exceed the values listed in Table 4;
– The peel-strength and the bond integrity shall be conform with 4.16 and 4.17.
At the end of this test, the starting torque under radial load shall be measured and shall conform with values listed in Tables 5 (a), 5 (b) and 5 (c). See Annex F.
Suitable processes and measuring instruments 4.14 bis Dynamic radial loads duty cycles: – at ambient temperature. Shall conform with the duty cycles. After the removal of the loads: – No metal-to-metal contact between inner and outer ring; – The liner wear shall not exceed the values listed in Table 4; – The peel-strength and the bond integrity shall be conform with 4.16 and 4.17. At the end of this test, the starting torque under radial load shall be measured and shall conform with values listed in Tables 5 (a), 5 (b) and 5 (c). See Annex E. X
Low friction coefficient for EN 4538-003 and or EN 4539-003 Coefficient of friction to be measured before and completion of the duty cycles test at− 54 °C, − 30 °C, − 10 °C and ambient temperature. For each temperature three measurements must be taken at 10 MPa, 60 MPa and 120 MPa pressure. The maximum value of coefficient of friction is µ = 0,18. See Annex G.
continued SIST EN 4540:2012
A b 4.15 Liner compatibility with the fluids At the end of this test:
– No metal-to-metal contact between inner and outer ring; – The liner wear shall not exceed the values listed in Table 4; – The peel strength and the bond integrity shall be conform with 4.16 and 4.17; – The starting torque under radial load shall be measured and shall conform with values listed in Tables 5 (a), 5 (b) and 5 (c). Check one bearing per fluid:
– Put the inner ring perpendicularly to the outer ring;
– The bearing shall be immersed for 24 h in the fluids listed in Annex C at the following temperatures:
– (45 ± 3) °C for those defined in C.1 and C.2,
– (70 ± 3) °C for those defined in C.3,
– Ambient temperature for those defined in C.4;
– Within 1/2 h after this test proceed to the test defined in B.2.4.
Suitable processes and measuring instruments X
4.16 Peel strength of the liner These requirements and this test apply only in the case where the manufacturer has established that the liner is peelable. The liner shall exhibit an average peel strength greater than 0,35 N for each millimetre of spherical width minus 2 mm to eliminate chamfers and edge effects. The mean peel strength value shall be determined with at least 75 % of the recorded value. See Annex D. For acceptance, this test shall be carried out immediately after assembling and curing. X X 4.17 Bond integrity For peelable liners, the liner: – shall not contain any contaminating substances; – shall adhere tightly to the outer ring over at least 90 % of the contact area. No void shall be allowed which cannot be described within a circle of diameter equal to: – 25 % of outer ring width; – 6 mm, whichever is smaller. After the peel strength test, evaluate the location and size of any voids.
X X
For non-peelable liners, a sectioned bearing shall be examined for bond integrity. The liner: – shall adhere tightly to the outer ring over at least 90 % of the contact area. No void shall be allowed which cannot be circumscribed within a circle of diameter equal to: – 25 % of outer ring width; – 6 mm, whichever is smaller.
Destructively examine the liner by chipping, scraping, abrasion, or other appropriate means to determine the bond integrity.
a Qualification test. b Acceptance test.
mm EN 4538-2EN 4539-2 03 4,83 0,036 to 0,34 0,036 to 0,34 04 6,35 0,066 to 0,56 0,036 to 0,34 05 7,94 06 9,52 07 11,11 08 12,70 09 14,29 10 15,87 12 19,05 14 22,22 0,138 to 0,90 0,138 to 0,90 16 25,40 20 31,75 0,24 to 1,50 0,138 to 1,80 24 38,10 28 44,45 32 50,80 —
mm EN 4538-003EN 4539-00303 4,83 0,06 to 0,56
0,06 to 0,56 04 6,35 0,11 to 0,90
0,11 to 0,90 05 7,94 06 9,52 07 11,11 08 12,70 09 14,29 10 15,87 12 19,05 14 22,22 16 25,40 20 31,75 0,23 to 1,50 0,23 to 1,50 24 38,10 28 44,45 32 50,80 —
Key 1 Plastic encapsulation 2 Bearing 3 Liner Figure 2 SIST EN 4540:2012
...