Aerospace series - Bushes with self-lubricating liner - Technical specification

This document specifies the required characteristics, inspections and tests, quality assurance and qualification, acceptance and delivery conditions for bushes, designed to be subjected under load, to slow sliding movements, rotations and small oscillations only for aerospace applications.
This standard applies to all bushes when referred to in the respective product standards or in a design documentation.
The liner is designed to be used in the temperature range of −50 °C to 163 °C. Aluminium bushes are limited to −55 °C to 121 °C.

Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische Lieferbedingungen

Diese Europäische Norm legt die geforderten Eigenschaften, Überprüfungen und Prüfungen, Qualitätssicherung und Qualifikation, Abnahme  und Lieferbedingungen für Buchsen, ausgelegt für die Verzögerung von Gleitbewegungen, Drehungen und kleinen Schwingungen unter Last, zur Verwendung ausschließlich in der Luft  und Raumfahrt fest.
Diese Europäische Norm gilt für alle Buchsen bei Bezugnahme in den jeweiligen Produktnormen oder einer Konstruktionsdokumentation.
Die Beschichtung ist für die Verwendung in einem Temperaturbereich von −50 °C bis 163 °C ausgelegt. Aluminiumbuchsen sind auf −55 °C bis 121 °C beschränkt.

Série aérospatiale - Bagues avec garniture autolubrifiante - Spécification technique

Aeronavtika - Puše s samomazalno oblogo - Tehnična specifikacija

Ta dokument določa zahtevane lastnosti, preglede in preskuse, zagotavljanje kakovosti in kvalifikacije, pogoje sprejema in dobave za puše, načrtovane za prenašanje obremenitev, za počasno drseče premikanje, vrtenje in majhna nihanja le za uporabo v aeronavtiki.
Ta standard se uporablja za vse puše iz posameznih standardov za izdelke ali iz projektne
dokumentacije.
Obloga je načrtovana za uporabo v temperaturnem razponu od −50 °C do 163 °C. Puše iz aluminija so omejene na razpon od −55 °C do 121 °C.

General Information

Status
Published
Publication Date
28-Mar-2017
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
29-Mar-2017
Completion Date
29-Mar-2017

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SLOVENSKI STANDARD
SIST EN 2311:2017
01-junij-2017
1DGRPHãþD
SIST EN 2311:2012
$HURQDYWLND3XãHVVDPRPD]DOQRREORJR7HKQLþQDVSHFLILNDFLMD
Aerospace series - Bushes with self-lubricating liner - Technical specification
Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische
Lieferbedingungen

Série aérospatiale - Bagues avec garniture autolubrifiante - Spécification technique

Ta slovenski standard je istoveten z: EN 2311:2017
ICS:
49.030.99 Drugi vezni elementi Other fasteners
SIST EN 2311:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 2311:2017
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SIST EN 2311:2017
EN 2311
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 49.035 Supersedes EN 2311:2012
English Version
Aerospace series - Bushes with self-lubricating liner -
Technical specification

Série aérospatiale - Bagues avec garniture Luft- und Raumfahrt - Buchsen mit selbstschmierender

autolubrifiante - Spécification technique Beschichtung - Technische Lieferbedingungen

This European Standard was approved by CEN on 2 January 2017.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2311:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 2311:2017
EN 2311:2017 (E)
Contents Page

European foreword ................................................................................................................................................................. 3

1 Scope ............................................................................................................................................................................. 4

2 Normative references ............................................................................................................................................. 4

3 Terms and definitions............................................................................................................................................. 5

4 Required characteristics, inspection and test methods ............................................................................. 7

5 Quality assurance .................................................................................................................................................. 11

6 Acceptance conditions ......................................................................................................................................... 12

7 Packaging ................................................................................................................................................................. 12

8 Certificate of compliance .................................................................................................................................... 13

(normative) Testing of permissible and ultimate static loads .......................................................... 15

A.1 Permissible radial static loads (C ) ................................................................................................................ 15

A.2 Ultimate radial static loads ................................................................................................................................ 15

A.3 Permissible axial static loads (C ) .................................................................................................................. 16

A.4 Ultimate axial static loads .................................................................................................................................. 17

(normative) Testing of permissible radial dynamic loads (C ) ..................................................... 19

B.1 Principle.................................................................................................................................................................... 19

B.2 Method ....................................................................................................................................................................... 19

(normative) Fluids — Essential characteristics ...................................................................................... 22

C.1 Fuel for turbine aero engine .............................................................................................................................. 22

C.2 Fluids for de-icing circuit .................................................................................................................................... 22

C.3 Hydraulic fluids ...................................................................................................................................................... 22

C.4 De-icing and anti-icing fluids ............................................................................................................................ 23

(normative) Resistance of the liner to peeling ....................................................................................... 24

D.1 Principle.................................................................................................................................................................... 24

D.2 Method ....................................................................................................................................................................... 24

(normative) Measurement of friction coefficient for EN 4534-2, EN 4535-2, EN 4536-2

and EN 4537-2 (for inch size only) .................................................................................................................. 25

E.1 Principle.................................................................................................................................................................... 25

E.2 Starting torque under load C at room temperature ............................................................................ 25

(informative) Permissible unit pressure................................................................................................... 27

(informative) Standard evolution form ..................................................................................................... 28

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SIST EN 2311:2017
EN 2311:2017 (E)
European foreword

This document (EN 2311:2017) has been prepared by the Aerospace and Defence Industries Association of

Europe - Standardization (ASD-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 ASD,

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 September 2017, and conflicting national standards shall be

withdrawn at the latest by September 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 2311:2012.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

---------------------- Page: 5 ----------------------
SIST EN 2311:2017
EN 2311:2017 (E)
1 Scope

This document specifies the required characteristics, inspections and tests, quality assurance and

qualification, acceptance and delivery conditions for bushes, designed to be subjected under load, to slow

sliding movements, rotations and small oscillations only for aerospace applications.

This standard applies to all bushes when referred to in the respective product standards or in a design

documentation.

The liner is designed to be used in the temperature range of −50 °C to 163 °C. Aluminium bushes are limited

to −55 °C to 121 °C.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

EN 2285, Aerospace series — Bushes, plain, aluminium alloy, with self-lubricating liner — Dimensions and

loads

EN 2286, Aerospace series — Bushes, flanged aluminium alloy, with self-lubricating liner — Dimensions and

loads

EN 2287, Aerospace series — Bushes, plain corrosion resisting steel, with self-lubricating liner — Dimensions

and loads

EN 2288, Aerospace series — Bushes, flanged, corrosion resisting steel, with self-lubricating liner — Dimensions

and loads

EN 2755, Aerospace series — Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner —

Elevated loads at ambient temperature — Technical specification

EN 4534-2, Aerospace series — Bushes, plain in aluminium alloy with self-lubricating liner, elevated load —

Part 2: Dimensions and loads — Inch series

EN 4535-2, Aerospace series — Bushes, flanged in aluminium alloy with self-lubricating liner, elevated load —

Part 2: Dimensions and loads — Inch series

EN 4536-2, Aerospace series — Bushes, plain in corrosion resisting steel with self-lubricating liner, elevated

load — Part 2: Dimensions and loads — Inch series

EN 4537-2, Aerospace series — Bushes, flanged in corrosion-resisting steel with self-lubricating liner, elevated

load — Part 2: Dimensions and loads — Inch series

EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defense Organizations

EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard

parts
EN 10204, Metallic products — Types of inspection documents

EN ISO 8785, Geometrical Product Specification (GPS) — Surface imperfections — Terms, definitions and

parameters
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SIST EN 2311:2017
EN 2311:2017 (E)
ISO 11078, Aircraft — De-icing/anti-icing fluids — ISO type II, III and IV

TR 4475, Aerospace series — Bearings and mechanical transmissions for airframe applications —

Vocabulary
3 Terms and definitions

For the purpose of this standard the terms and definitions given in TR 4475 and the following definitions

apply.
3.1
bush with self-lubricating liner

ring in corrosion resisting steel or aluminium alloy with a self-lubricating liner bonded to the bore

Note 1 to entry: With regards to flanged bushes the self-lubricating material is bonded to the outer face of the flange

as well as the bore.
3.2
loads
3.2.1

permissible static load C or permissible static axial load C (flanged bushes only)

S a

maximum permissible load (without safety factor), which can be applied statically

Note 1 to entry: It is defined as a unit pressure multiplied by the effective projected area (radial or axial) for

deformations that are compatible with correct operational behaviour.
3.2.2
ultimate static load (radial or axial)
1,5 times the value of the permissible static load

Note 1 to entry: It is defined as being the highest load the bush will support without failure occurring.

3.2.3
permissible dynamic radial load C

load that a bush can withstand, when subjected to an oscillating motion for 25 000 cycles at the rate of

(12 ± 2) cycles/min
3.2.4
cycle

angular displacement of the shaft in relation to the lined bush of 0° to −25°, then of −25° to +25° and finally

+25° to 0°, see Figure 1
Figure 1 — Cycle

Published as ASD-STAN Technical Report at the date of publication of this standard. http://www.asd-stan.org/

---------------------- Page: 7 ----------------------
SIST EN 2311:2017
EN 2311:2017 (E)
3.3
friction torque under load at ambient temperature
coefficient of friction calculated as follows:
𝑇𝑇
𝜇𝜇  =
𝐶𝐶  ⋅ 𝑅𝑅
where
μ is the coefficient of friction;
T is the dynamic rotational torque under load, expressed in Newton meters (Nm);
R is the radius of shaft, expressed in metres (m);
C is the dynamic radial load, expressed in Newton (N).
3.4
surface discontinuities
3.4.1
crack

linear recession with a sharp bottom resulting from a disturbance of the integrity of the surface and of the

parent material of the workpiece
[SOURCE: EN ISO 8785, modified: figure not included]
3.4.2
scratch
score

surface imperfection which is a recession of irregular shape and unspecified direction

[SOURCE: EN ISO 8785, modified: synonym “score” added, figure not included]
3.4.3
lap

tongue-like raising of small thickness, often in the form of a seam, caused by folding over of material and

forcing it into the surface when rolling, forging etc.
[SOURCE: EN ISO 8785, figure not included]
3.4.4
seam
non-welded fold which appears as an open defect in the material
3.5
void

area where the adhesive bond is broken or non-existent leaving a smooth and clean area on the metallic

surface
Note 1 to entry: Used in context of adhesion of the liner.
3.6
delivery batch

consists of bushes bearing the same identity block although they may originate from different manufacturing

batches
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SIST EN 2311:2017
EN 2311:2017 (E)
4 Required characteristics, inspection and test methods
According to Table 1.
Table 1 — Required characteristics, inspection and test methods (1 of 4)
a a
Clause Characteristics Requirements Inspection and test method Q A
4.1 Materials In accordance with the Chemical analysis and physical X X
product standards or properties or a certificate of
design documentation compliance according to EN 10204,
3.1B issued by the semi-finished
product manufacturer.
4.2 Dimensions and In accordance with the Suitable measuring instruments X X
tolerances product standards or b
Measurement of the bore and of
design documentation
the outer diameter
— Rings having a width of < 10 mm:
— in the median plane.
— Rings having a width of > 10 mm:
— in two planes parallel to the
outer faces and placed at a
distance from these faces
twice the maximum chamfer
value of these rings.
Measurement of widths of rings:
— A minimum four point check on
the width of each ring (distance
between the two faces).
4.3 Masses In accordance with the Suitable methods X
product standards or
design documentation
4.4 Marking In accordance with the Visual examination X X
product standards or
design documentation

4.5 Surface appearance — The bushes shall be Visual monitoring using appropriate X X

free of surface procedures.
discontinuities liable to
have a detrimental
effect on the
characteristics and
durability.
— The liner shall not
contain contaminant
products and shall not
show broken or voided
areas.
— No lubrication allowed.
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SIST EN 2311:2017
EN 2311:2017 (E)
Table 1 — Required characteristics, inspection and test methods (2 of 4)
a a
Clause Characteristics Requirements Inspection and test method Q A

4.6 Surface roughness Shall conform to product Suitable measuring instruments or X X

standards visual tactile samples.
4.7 Static loads: Shall conform to product According to Annex A. X
standards
— radial: C With permissible static
loads no maximum total
deformations greater than
those indicated in
Table A.1.
— axial: C After removal of the loads,
no permanent
deformations greater than
those indicated in
Table A.1.
4.8 Ultimate loads After removal of the loads, According to Annex A. X
no rupture, or crack.
— radial
— axial
4.9 Dynamic load and
friction coefficient
4.9.1 Dynamic radial Shall conform to product According to Annex B.
load C standards.
After removal of the
loads: These shall be:
— at ambient — no metal to metal
temperature contact between the
shaft and bush.
— at low — wear of the liner shall
temperature not exceed the values
indicated in Table B.1.
— at high — liners resistance to
temperature peeling and adhesion
shall meet the
requirements of 4.11
and 4.12.
4.9.2 Friction coefficient After dynamic test and According to Annex E.
before removal of load,
torque to rotate shaft
shown in Figure B.1 shall
be measured and the value
of μ calculated. The value
shall not exceed 0,05 at
ambient temperature
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SIST EN 2311:2017
EN 2311:2017 (E)
Table 1 — Required characteristics, inspection and test methods (3 of 4)
a a
Clause Characteristics Requirements Inspection and test method Q A
4.10 Compatibility The bushes shall meet the Check one bush per fluid: X
between the liner requirements of 4.9 at
— the bush shall be immersed for
and fluids ambient temperature after
24 h in the fluids stated in
immersion in the specified
Annex C at the following
fluids.
temperatures:
Wear of the liner shall not
— (45 ± 3) °C for those defined
exceed the values
in C.1 and C.2,
indicated in Table B.1.
— (70 ± 3) °C for those defined
in C.3,
— ambient temperature for
those defined in C.4.
Within ½ h after this test, proceed to
the test defined in B.2.4.
4.11 Resistance of the The requirements of this According to Annex D. X X
liner to peeling test shall only be applied
For acceptance, this test shall be
when there is an
carried out immediately after
indication from the
assembly and curing.
manufacturer that the
liner is susceptible to
peeling.
Bushes smaller than
15 mm diameter shall be
exempt from this
requirement.
It shall present a mean
peeling resistance of
> 0,35 N/mm of width of
the outer ring reduced by
2 mm to eliminate the
effects of edges and
chamfers. Mean resistance
shall be such that at least
75 % of the recording
curve lies above
0,35 N/mm.
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