SIST EN 4854-3:2020

SLOVENSKI STANDARD
SIST EN 4854-3:2020
01-januar-2020
Aeronavtika - Kroglasti drsni ležaj iz korozijsko odpornega jekla s samomazalno
oblogo, z majhnim začetnim navorom in majhnim tornim količnikom, povišanimi
delovnimi cikli pri nizkih oscilacijah v različnih obratovalnih pogojih - 3. del:
Tehnična specifikacija
Aerospace series - Bearing, spherical plain, in corrosion resisting steel with self-
lubricating liner, low starting torque and low friction coefficient, elevated duty cycles
under low oscillations at different operating conditions - Part 3: Technical specification
Luft- und Raumfahrt - Gelenklager aus korrosionsbeständigem Stahl mit
selbstschmierender Beschichtung, geringem Losbrechmoment und niedrigem
Reibungskoeffizienten, hohe Anzahl an gering oszillierenden Belastungszyklen bei
unterschiedlichen Einsatzbedingungen - Teil 3: Technische Lieferbedingungen
Série aérospatiale - Rotules en acier résistant à la corrosion à garniture autolubrifiante,
faible couple de démarrage et faible coefficient de frottement, cycles d'endurances
élevés sous faibles oscillations à différentes conditions de fonctionnement, série large -
Partie 3 : Spécification Technique
Ta slovenski standard je istoveten z: EN 4854-3:2019
ICS:
21.100.10 Drsni ležaji Plain bearings
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
SIST EN 4854-3:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4854-3:2020

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SIST EN 4854-3:2020


EN 4854-3
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2019
EUROPÄISCHE NORM
ICS 49.035
English Version

Aerospace series - Bearing, spherical plain, in corrosion
resisting steel with self-lubricating liner, low starting
torque and low friction coefficient, elevated duty cycles
under low oscillations at different operating conditions -
Part 3: Technical specification
Série aérospatiale - Rotules en acier résistant à la Luft- und Raumfahrt - Gelenklager aus
corrosion à garniture autolubrifiante, faible couple de korrosionsbeständigem Stahl mit selbstschmierender
démarrage et faible coefficient de frottement, cycles Beschichtung, geringem Losbrechmoment und
d'endurances élevés sous faibles oscillations à niedrigem Reibungskoeffizienten, hohe Anzahl an
différentes conditions de fonctionnement, série large - gering oszillierenden Belastungszyklen bei
Partie 3 : Spécification Technique unterschiedlichen Einsatzbedingungen - Teil 3:
Technische Lieferbedingungen
This European Standard was approved by CEN on 12 November 2018.

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, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4854-3:2019 E
worldwide for CEN national Members.

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SIST EN 4854-3:2020
EN 4854-3:2019 (E)
Contents
Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements, inspection and test methods . 9
5 Quality management system . 20
5.1 Product qualification . 20
5.2 Acceptance conditions . 20
5.2.1 Inspections and tests to be carried out by the manufacturer . 20
5.2.2 User’s quality control . 20
6 Packaging . 21
7 Certificate of conformity . 21
Annex A (normative) Verification of permissible and ultimate static loads (C , C ) . 26
s a
A.1 Permissible radial loads (C ) . 26
s
A.1.1 Principle . 26
A.1.2 Method . 26
A.2 Ultimate radial static load . 26
A.2.1 Principle . 26
A.2.2 Method . 26
A.3 Permissible axial static load (C ) . 27
a
A.3.1 Principle . 27
A.3.2 Method . 27
A.4 Ultimate axial static load . 27
A.4.1 Principle . 27
A.4.2 Method . 27
Annex B (normative) Verification of dynamic radial loads (C ) . 30
dyn
B.1 Principle . 30
B.2 Verification . 31
B.2.1 High and medium surface pressure tests . 31
B.2.2 Low surface pressure tests . 31
B.2.3 Test sequence . 32
Annex C (normative) Fluids — Essential characteristics . 37
C.1 Cleaning agent . 37
C.2 De-icing and anti-icing fluids . 37
C.3 Mineral fluid for hydraulic transmission . 37
C.4 Phosphate ester hydraulic fluid . 37
C.5 Fuel for turbine engine . 37
C.6 Silicon fluid Wacker AK 10 . 37
C.7 Salt laden atmosphere . 38
Annex D (normative) Peeling strength and bond integrity. 39
2

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D.1 Peeling strength . 39
D.1.1 Principle . 39
D.1.2 Method . 39
D.2 Bond integrity . 40
D.2.1 Peelable liner types . 40
D.2.2 Non-peelable liner types . 40
Annex E (normative) Friction coefficient . 41
Bibliography . 42


3

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SIST EN 4854-3:2020
EN 4854-3:2019 (E)
European foreword
This document (EN 4854-3:2019) 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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
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.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
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1 Scope
This European Standard specifies the required characteristics, inspection and test methods,
qualification and acceptance conditions for spherical plain bearings in corrosion resisting steel with
self-lubricating liner, low starting torque and low friction coefficient, elevated duty cycles under low
oscillations at different operating conditions.
This standard applies whenever referenced.
These self-lubricating spherical plain bearings are intended for use in fixed or moving parts of the
aircraft structure especially for control mechanism and operating systems. The bearings are designed
subjected under low dynamic radial loads and slow rotations in the temperature range of
−55 °C to 120 °C (−67 °F to 248 °F).
The liner may be of a fabric or composite material bonded to the inside diameter of the outer ring or in
a composite material moulded into a pre-formed cavity between the inner and outer rings.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 4854-1, Aerospace series — Bearing, spherical plain, in corrosion resisting steel with self-lubricating
liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at
different operating conditions, narrow series — Part 1: Dimensions and loads
EN 4854-2, Aerospace series — Bearing, spherical plain, in corrosion resisting steel with self-lubricating
liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at
different operating conditions, wide series — Part 2: Dimensions and loads
EN 10204, Metallic products — Types of inspection documents
MIL-PRF-87257B, Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft
and Missile
NSA307110, Fluid — Hydraulic Phosphate Ester — Base Fire Resistant
1
TR 4475, Bearings and mechanical transmissions for airframe applications — Vocabulary
ASTM D 1655, Specification for Aviation Turbine Fuels

1 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).
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in TR 4475 and the following apply.
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
self-lubricated spherical plain bearing, self-aligning in corrosion resistant steel with and
without staking groove
bearing consisting of two concentric rings, between which is interposed a self-lubricating liner which is
bonded or moulded on the spherical surface of the outer ring (race)
Note 1 to entry: The width of the inner ring (ball) is greater than the width of the outer ring (race), so that a
tilting movement is possible in addition to the rotational movement.
Note 2 to entry: The outer ring (race) has no assembly slot but may have staking grooves for mechanical
swaging.
3.2
surface discontinuities
see TR 4475 (surface imperfections)
3.3
starting torque without load
torque required to start the rotation of the inner ring (ball) with the outer ring (race) held stationary
3.4
friction coefficient
coefficient of the torque moment and the product of the load on the bearing and the inner spherical ring
(ball) radius
Note 1 to entry: The friction coefficient of the bearing under load is given by the following formula:
𝐶𝐶
(1)
𝜇𝜇 =
𝐹𝐹𝐹𝐹
where
μ is the friction coefficient;
C is the torque moment in Nm;
F is the load on the bearing in N;
R is the inner spherical ring (ball) radius in m.
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3.5
permissible [limit] static radial load
C
s
load corresponding to a permissible unit pressure multiplied by the effective projected area in the
radial direction, the inner ring (ball) being able to take any position within the limits of the tilting angle
indicated in the product standard
Note 1 to entry: The direction of the load remains in the centre plane of the outer ring (race).
Note 2 to entry: The definition for the effective projected area in radial direction is given by following simplified
calculation:
𝐴𝐴 =𝐾𝐾(𝐶𝐶 − 2𝑇𝑇 ) (2)
r min. max.
where
2
A is the effective radial projected area in mm ;
r
K spherical diameter in mm [in];
C minimum width of the outer ring (race) in mm [in];
min
T maximum liner set back in mm [in].
max
Dimensions are given in the appropriate product standards.
3.6
permissible [limit] static axial load
C
a
load corresponding to a permissible unit pressure multiplied by the effective projected area in the axial
direction
Note 1 to entry: The effective projected area in axial direction is given by following calculation:
𝐴𝐴 =𝐴𝐴 −𝐴𝐴 (3)
a øK øK−h
2 2
ø𝐾𝐾 ø𝐾𝐾 (4)
𝐴𝐴 =𝜋𝜋 � � −𝜋𝜋 �� �−ℎ�
a
2 2
(5)
2
ø𝐾𝐾 1 ø𝐾𝐾
2
�
( )
ℎ = − 4� � − 𝐶𝐶 − 2𝑇𝑇
min. max.
2 2 2
𝜋𝜋
2 (6)
𝐴𝐴 = (𝐶𝐶 − 2𝑇𝑇 )
a min. max.
4
where
2
A is the effective axial projected area in mm ;
a
K spherical diameter in mm [in];
h is the theoretical dimension, can be subjected to the liner thickness (difference between the

spherical diameter and minimum diameter of the inner ring after swaging,), in mm [in];
7

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C minimum width of the outer ring (race) in mm [in];
min
T maximum liner set back in mm [in].
max
Dimensions are given in the appropriate product standards. See also Figure 1.

Figure 1 — Effective projected areas (radial and axial)
3.7
dynamic radial load
oscillatory duty cycles
load which may be withstood by a bearing submitted to an oscillatory movement for a defined number
and rate of oscillation cycles without the dimensional or other characteristics deviating from the values
permitted by this technical specification
Note 1 to entry: The number and rate of oscillation cycles to be considered for this technical specification are
defined in Annex B.
3.8
ultimate static load
load defined as being the highest load that a product can accept without fractures and cracks; the
ultimate static load is equivalent to the permissible (limit) static load (radial or axial) multiplied by 1,5
3.9
duty cycle
series of oscillating cycles under constant or varying load applied to a bearing
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3.10
oscillating cycle
sequence of alternate angular displacements (φ °) of one ring in relation to the other
Note 1 to entry: The oscillating cycle has the following composition:
— from 0° to +φ°;
— then from +φ° to −φ°;
— and finally from −φ° to 0°.
The angular displacement (see Figure 2) to be considered for this technical specification is defined in
Annex B.

Figure 2 — Angular displacement (oscillating cycles)
3.11
delivery batch
batch consisting of bearings with the same identity block, which may come from different production
batches
4 Requirements, inspection and test methods
For required characteristics, inspection and test methods see Table 1.
For starting torques at zero load see Table 2.
For maximum permanent deflection and deformation see Table 3.
For maximum starting torques at different surface pressure levels see Table 4.
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Table 1 — Characteristics, inspections and test methods
a b
Clause Characteristics Requirements Inspection and test methods
Q A
4.1 Materials Shall conform to the product Chemical analysis or certificate X X
standards or design issued by semi-finished product
documentation. manufacturer
4.2 Dimensions and Shall conform to the product Suitable calibrated measuring X X
tolerances standards or design instruments
documentation.
Measurement of bore and outer
Dimensions not shown shall be diameter:
at manufacturer’s option.
— 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.
4.3 Masses Shall conform to the product Suitable methods X
standards or design documen-
tation.
4.4 Marking Shall conform to the product Visual examination X X
standards or design docu-
mentation. It shall be legible
and shall not adversely affect
the material or the functioning
of the bearing.
4.5 Surface — the bearings shall be free
appearance 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.
4.5.1 Assembled Visual inspection using suitable X X
bearings methods
4.5.2 Unassembled Magnetic or dye penetrant X X
rings inspection
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a b
Clause Characteristics Requirements Inspection and test methods
Q A
4.6 Hardness Shall conform to the product Suitable processes and measuring X X
standards or design instruments
documentation.
4.7 Surface Shall conform to the product Suitable measuring instruments or X X
roughness standards or design visual-tactile samples
documentation.
4.8 Surface Shall conform to the product — Visual inspection; X X
treatment standards or design
— as per surface treatment
documentation.
standard.
Movability and — — — —
4.9
clearances
4.9.1 Behaviour in Bearings shall be able to move Manual inspection X X
rotation and tilt freely within the angular limits
specified in the product
standards or design
documentation.
4.9.2 The internal radial and axial — Suitable measuring X X
Internal
clearances shall conform to the instruments;
clearances
product standards.
(radial and axial)
— test load: ±13,3 N (±3 lbs)
4.10 Starting torque —
without load
4.10.1 — at ambient Shall conform to Table 2 and Suitable processes and measuring X X
temperature product standards. instruments:
+ 2
— measurement of the starting
23 °C
−10
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.
4.10.2 — at low Starting torque must be — Subject the bearing, during 4 h X
temperature ≤ 2 times that listed in Table 2 at the low temperature;
+ 5 and product standards.
— immediately after, measure the
−55 °C
−10
torque following 4.10.1.
4.10.3 — after limit Shall conform to Table 2 and — Subject the bearing during 1 h X
tempera- product standards. at the low temperature °C, then
tures. 1 h at the high temperature;
+ 5
−55 °C — repeat successively × 10 this
−10
+10 test;
85 °C
− 5
— 4 h after these tests, measure
the torque, at ambient
temperature, following 4.10.1.
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a b
Clause Characteristics Requirements Inspection and test methods
Q A
4.11 Conformity of — For bearings with bonded liner
ball and race types, the conformity of the ball and
the race shall be measured
normally. For bearings with
injected/moulded liner types, the
conformity of the ball and the race
shall be measured both normally
and circumferentially.
4.11.1 — normal Difference between the values Encapsulate the bearing in plastic X
conformity measured radially from the material as used in metallurgical
center of the bore shall not mounts, to prevent motion of the ball
exceed 0,08 mm. with respect to the race.
Section the bearing following a
diameter plane normal to the race
side and polish the surfaces
(see Figure 3a).
By use of an optical comparator or
another accurate technique,
measure dimension “t” radially from
the ball to the race on both opposite
surfaces at a minimum of five
uniformly spaced positions across
the bearing (see Figure 3a). The
selected points shall include the
center position of the race as well as
both the C/10 positions.
4.11.2 Difference between the values Bearings with injected/moulded X
— circum-
measured radially from the liners shall be encapsulated in plastic
ferential
center of the bore shall not material as used in metallurgical
conformity
exceed 0,08 mm. mounts, to prevent motion of the ball
with respect to the race.
Section the bearing along the
diameter described by the centerline
of the race width and polish the
surfaces (Figure 3b).
By use of an optical comparator or
another accurate technique,
measure dimension “δ” radially
from the center of the bore at a
minimum of eight uniformly spaced
positions.
4.12 Permissible Shall conform to the product See Annex A. X
static loads: standards or design documen-
tation.
— radial: C ;
s
No maximum total deflection
— axial: C .
a
greater than those listed in
Table 3 under permissible
static loads (C ).
s
After removing the loads, no
permanent deformations
greater than those listed in
Table 3.
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a b
Clause Characteristics Requirements Inspection and test methods
Q A
4.13 Ultimate static After the removal of the loads, See Annex A. X
loads: there shall be no cracks, no
push out of the inner ring or
— radial;
deterioration of the bearing.
— axial.
4.14 Dynamic radial — — — —
loads at various
environmental
conditions
4.14.1 High and Shall conform to the product See Annex B and Annex C. X
medium surface standards or design
pressure tests documentation.
After the removal of the loads:
— at
100 % C ;
dyn — no metal-to-metal contact
between inner and outer
— at 50 % C .
dyn
ring;
— the liner wear shall not
exceed 0,15 mm;
— the inner race shall show
no signs of damage and
the surface finish shall not
have deteriorated. Inner
ring surface finish shall be
measured before and after
See Annex D.
dynamic testing;
— the peel-strength and the
bond integrity shall
conform to 4.16 and 4.17.
 At the end of this test, the Suitable processes and measuring
starting torque under radial instruments
load shall be measured and
shall conform to values listed
in Table 4.
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a b
Clause Characteristics Requirements Inspection and test methods
Q A
4.14.2 Low surface Shall conform to the duty See Annex B and Annex C. X
pressure tests cycles. After the removal of the
loads:
— at 5 MPa;
— no metal-to-metal contact
— at 3 MPa;
between inner and outer
— at 1 MPa.
ring;
— the liner wear shall not
exceed 0,15 mm;
— the inner race shall show
no signs of damage and
the surface finish shall not
have deteriorated. Inner
ring surface finish shall be
measured before and after
dynamic testing;
See Annex D.
— the peel-strength and the
bond integrity shall
conform to 4.16 and 4.17.
At the end of this test, the Suitable processes and measuring

starting torque under radial instruments
load shall be measured and
shall conform to values listed
in Table 4.
4.14.3 Friction Friction coefficient to be See Annex E. X
coefficient determined before and after
completion of the duty cycles
at each defined
...