BSI Standards PublicationBS EN 4538-2:2014 Aerospace series — Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations —
Trang 1BSI Standards Publication
BS EN 4538-2:2014
Aerospace series — Bearings, spherical plain, in corrosion resisting steel with
self-lubricating liner elevated load under low oscillations — Narrow series — Dimensions and loads
Part 2: Inch series
Trang 2National foreword
This British Standard is the UK implementation of EN 4538-2:2014 The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems
A list of organizations represented on this committee can be obtained on request to its secretary
This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application
© The British Standards Institution 2014 Published by BSI Standards Limited 2014
ISBN 978 0 580 81520 1 ICS 49.035
Compliance with a British Standard cannot confer immunity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2014
Amendments issued since publication
Trang 3BS EN 4538-2:2014
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
ICS 49.035
English Version
Aerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low
oscillations - Narrow series - Dimensions and loads - Part 2: Inch
series
Série aérospatiale - Rotules, en acier résistant à la
corrosion à garniture autolubrifiante à charge élevée sous
faibles oscillations - Série étroite - Dimensions et charges -
Partie 2: Série en inches
Luft- und Raumfahrt - Gelenklager, aus korrosionsbeständigem Stahl mit selbstschmierender Beschichtung, hohe Belastung bei geringer Drehbewegung
- Schmale Reihe - Maße und Belastungen - Teil 2: Inch
Reihe
This European Standard was approved by CEN on 21 March 2013
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom
EUROPEAN COMMITTEE FOR STANDARDIZATION
C O M I T É E U R O P É E N D E N O R M A L I S A T I O N
E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members
Ref No EN 4538-2:2014 E
Trang 4Contents Page
Foreword 3
1 Scope 4
2 Normative references 4
3 Symbols and definitions 4
4 Required characteristics 5
4.1 Configuration, dimensions, tolerances and masses 5
4.2 Surface roughness 5
4.3 Loads and starting torques 7
4.4 Materials and surface treatments 7
4.5 Surface treatment on the inner ring 7
5 Designation 8
6 Marking 8
7 Technical specification 8
Trang 5BS EN 4538-2:2014
EN 4538-2:2014 (E)
3
Foreword
This document (EN 4538-2:2014) 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 January 2015, and conflicting national standards shall be withdrawn at the latest by January 2015
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom
Trang 61 Scope
This European Standard specifies the characteristics of spherical plain bearing in corrosion resistant steel, with self-lubricating liner, narrow series, elevated load under low oscillations applications
They shall be used in the temperature range – 55 °C to 163 °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 2030, Aerospace series — Steel X105CrMo17 (1.4125) — Hardened and tempered — Bars — D e ≤ 150 mm 1)
EN 2424, Aerospace series — Marking of aerospace products
EN 3161, Aerospace series — Steel FE-PM3801 (X5CrNiCu17-4) — Air melted, solution treated and precipitation treated, bar a or D ≤ 200 mm, R m ≥ 930 MPa
EN 4540, Aerospace series — Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations — Technical specification
ISO 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions
ISO 8075, Aerospace — Surface treatment of hardenable stainless steel parts
3 Symbols and definitions
For the purposes of this document, the symbols and definitions given in ISO 1132-1 apply
∆dmp = single plane mean bore diameter deviation
∆ds = deviation of a single bore diameter
∆Dmp = single plane mean outside diameter deviation
∆Ds = deviation of a single outside diameter
α = angle of tilt of the outer ring with respect to the inner ring, the spherical surface of the outer ring being
completely in contact with the inner ring
1) Published as ASD-STAN Prestandard at the date of publication of this standard http://www.asd-stan.org/
Trang 7BS EN 4538-2:2014
EN 4538-2:2014 (E)
5
4 Required characteristics
4.1 Configuration, dimensions, tolerances and masses
See Figures 1 and 2 and Table 1 The dimensions are expressed in millimetres and apply after surface treatment
4.2 Surface roughness
See Figures 1 and 2 The values are expressed in micrometres and apply before surface treatment
Figure 1 — Bearing without swaging groove, code S
3,2, 0,2 0,8
Trang 8
Key
1 Break sharp corner 0,12 max
Figure 2 — Bearing with swaging groove, code R
Table 1
Dimensions in millimetres
Code nom − 0,06 ± 0,1 0 ∆dmp ∆ds ∆Dmp ∆Ds min ≈ + 0,1 0 – 0,2 0 + 0,1 0 max min ± 0,5 ≈
03 4,826 7,137 5,537 14,287
0 − 13
+ 3 − 13
0 − 13 + 3 − 15
7,442 11,1 12,7
0,7 0,127
to 0,254
0,254
to 0,508
0,127
to 0,381
0,76 10°
20°
min 9
04 6,35 8,712 6,35 16,667 9,245 12,7 15,087
05 7,937 9,525 7,137 19,05 10,642 15,062 16,51
0,9
30°
14
06 9,525 10,312 7,925 20,637 12,065 15,875 18,08
0,254
to 0,432
0,508
to 0,762
0,889
07 11,113 11,1 8,712 23,017 13,462 17,449 20,472 4
8°
22
08 12,7 12,7 9,906 25,4 15,24 19,837 22,250 4
1,4
31
09 14,288 14,275 11,1 27,78 17,018 22,225 24,638
12 19,05 19,05 15,062 36,513 23,368 31,75 33,35
0,762
to 1,02 1,14
95
16 25,4 25,4 20,243 44,45
+ 3 − 15
20 31,75 27,762 23,926 50,8 36,703 45,237 47,7
1,5 0,254 to
240
a Attention should be paid to the possible indentation of the support mountings by the inner ring bearing faces
b Maximum values for the user
3,2, 0,2 0,8
Trang 9BS EN 4538-2:2014
EN 4538-2:2014 (E)
7
4.3 Loads and starting torques
See Table 2
Table 2
kN
Permissible dynamic radial loads
25 000 cycles
Minimum projected surface area b
Starting torques
Radial
Cs
Axial a
03 17,68 0,66 6,67 44,5 0,06 0,34
04 26,86 1,91 14,77 61,3
0,11 0,56
05 38,92 3,11 24,30 84,5
06 46,88 4,89 29,37 97,6
07 58,71 6,22 35,82 121
08 79,62 9,34 46,28 161,2
09 103,19 16,37 57,85 201,5
10 135,67 20,99 73,20 270,9
12 206,39 30,02 105,02 405,6
14 276,68 41,58 134,61 531,3 0,23
0,9
16 365,64 54,09 169,10 712,4
20 405,00 78,00 200,27 978,9
0,40 1,50
24 619,39 117,06 322,08 1 517,3
28 1 274,32 151 448,90 1 994,8
a These values apply to bearings without staking groove For bearings with staking groove, the push-out loads may be smaller than these values
b The projected surface area values are given to determine for each bearing size the duty cycle loads
The duty cycles are defined in the technical specification EN 4540
4.4 Materials and surface treatments
Inner ring: steel EN 2030, hardness 55 HRC to 62 HRC
Outer ring: steel EN 3161, hardness 28 HRC to 37 HRC before swaging
Liner: self-lubricating low friction wear resistant material consistent with the requirements of EN 4540
4.5 Surface treatment on the inner ring
Surface treatment at the convenience of the bearing manufacturer to fulfil the requirements of the dimensional standard and of the technical specification (see ISO 8075)
Trang 105 Designation
EXAMPLE
Description block BEARING
Identity block EN4538-2-12A
Number of this standard
Diameter code (see Table 1)
Technology code
Where the following technology codes are applied:
– code A, bonded liner technology;
– code B, injected or moulded liner technology;
– without code, both technologies can be used at user’s convenience
NOTE If necessary, the code I9005 should be placed between the description block and the identity block
6 Marking
EN 2424, style A
The marking position is at the manufacturer’s option
Bearings ordered without technology code shall be delivered marked in accordance with its technology code
7 Technical specification
See EN 4540
Trang 11This page deliberately left blank
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