Railway applications - Brake discs for railway rolling stock - Part 1: Brake discs pressed or shrunk onto the axle or drive shaft, dimensions and quality requirements

This European Standard specifies requirements for the design, dimensions, performance, and testing of the brake disc, hereafter called "disc". This European Standard applies to discs secured at the axle or drive-shaft of railway rolling stock by a cylindrical or conic tapered interference fit.
For each discrete unit so fitted, one or more disc brake rings, each having two axially separated friction faces, may be deployed.
This European Standard applies to discs designed to be fitted to rail vehicles used on the main national networks, urban networks, underground railways, trams and private networks (regional railways, company railways etc.).
NOTE   This European Standard should be used in association with the standards prEN 15328 and CEN/TC 256 N 185 covering disc brake linings.

Bahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 1: Wellenbremsscheiben, aufgepresst oder geschrumpft, Abmessungen und Qualitätsanforderungen

Diese Europäische Norm legt Anforderungen für Bau, Abmessungen, Leistungsfähigkeit und Prüfung von
Bremsscheiben fest, die auf dem Schienenfahrzeugradsatz oder auf einer Antriebswelle durch einen
zylindrischen oder konischen Presssitz befestigt sind.
Jede einzelne so befestigte Einheit kann einen oder mehrere Bremsringe mit je zwei axial getrennten
Reibflächen aufweisen.
Diese Europäische Norm gilt für Bremsscheiben, die für Schienenfahrzeuge konstruiert sind, die auf
nationalen, städtischen, U-Bahn-, Straßenbahn- oder auf privaten Schienennetzen (Regionalbahnen,
Werksbahnen usw.) betrieben werden.
ANMERKUNG Diese Europäische Norm sollte im Zusammenhang mit prEN 15328 und CEN/TC 256 N 185
angewendet werden, die die Bremsbeläge für Scheibenbremsen behandeln.

Applications ferroviaires - Disques de frein pour matériel ferroviaire - Partie 1: Disques de frein calés ou frettés sur essieu ou sur arbre moteur, dimensions et exigences de qualité

La présente Norme européenne spécifie les exigences à respecter pour la conception, les dimensions, les performances et les essais de disques de frein, ci-après désignés par le terme «disques». La présente Norme européenne est applicable aux disques de frein fixés sur l’essieu ou sur l’arbre moteur de matériel roulant ferroviaire par emmanchement conique ou cylindrique.
Chaque unité ainsi fixée peut comprendre une ou plusieurs couronnes de disque de frein, chaque couronne ayant deux surfaces de friction séparées axialement.
La présente Norme européenne s’applique aux disques de frein conçus pour équiper les véhicules ferroviaires utilisés par les réseaux principaux nationaux, les réseaux urbains, métropolitains, les tramways et les réseaux privés (chemins de fer régionaux, compagnies privées, etc.).
NOTE   Il convient que la présente Norme européenne soit utilisée en association avec l’EN 15328 et le CEN/TC 256/N 185 traitant des timonerie de frein à disque.

Železniške naprave - Kolutne zavore za železniška vozila - 1. del: Kolutne zavore (diski), nameščene na osi s hladnim ali vročim postopkom, mere in zahteve za kakovost

Ta evropski standard določa zahteve za načrtovanje, mere, izdelavo in preskušanje kolutnih zavor, v nadaljevanju »diskov«. Ta evropski standard velja za diske, pritrjene na osi železniških vozil z valjastim ali stožčastim interferenčnim vijakom. Za vsako tako opremljeno ločeno enoto se lahko uporabi en ali več obročev kolutnih zavor, vsak z osno ločenimi tornimi ploskvami. Ta evropski standard velja za diske, namenjene pritrditvi na železniška vozila, ki se uporabljajo na glavnih nacionalnih omrežjih, mestnih omrežjih, podzemnih železnicah, tramvajih in zasebnih omrežjih (regionalnih železnicah, železnicah podjetij itd.).

General Information

Status
Withdrawn
Publication Date
10-May-2011
Withdrawal Date
05-Mar-2019
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
06-Mar-2019

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NDNRYRVWBahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 1: Wellenbremsscheiben, aufgepresst oder geschrumpft, Abmessungen und QualitätsanforderungenApplications ferroviaires - Disques de frein pour matériel roulant ferroviaire - Partie 1: Disques de frein calés ou frettés sur essieu ou sur arbre moteur, dimensions et exigences de qualitéRailway applications - Brake discs for railway rolling stock - Part 1: Brake discs pressed or shrunk onto the axle or drive shaft, dimensions and quality requirements45.040Materiali in deli za železniško tehnikoMaterials and components for railway engineeringICS:Ta slovenski standard je istoveten z:EN 14535-1:2005+A1:2011SIST EN 14535-1:2006+A1:2011en,fr,de01-september-2011SIST EN 14535-1:2006+A1:2011SLOVENSKI

STANDARD
SIST EN 14535-1:2006+A1:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14535-1:2005+A1
May 2011 ICS 45.060.01 Supersedes EN 14535-1:2005English Version

Railway applications - Brake discs for railway rolling stock - Part 1: Brake discs pressed or shrunk onto the axle or drive shaft, dimensions and quality requirements

Applications ferroviaires - Disques de frein pour matériel roulant ferroviaire - Partie 1: Disques de frein calés ou frettés sur essieu ou sur arbre moteur, dimensions et exigences de qualité

Bahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 1: Wellenbremsscheiben, aufgepresst oder geschrumpft, Abmessungen und Qualitätsanforderungen This European Standard was approved by CEN on 28 October 2005 and includes Amendment 1 approved by CEN on 3 April 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 14535-1:2005+A1:2011: ESIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 2 Contents page Foreword ................................................................................................................................................................ 4Introduction ........................................................................................................................................................... 51Scope......................................................................................................................................................... 62Normative references .............................................................................................................................. 63Terms and definitions .............................................................................................................................. 64Symbols and units ................................................................................................................................... 85Requirements ........................................................................................................................................... 95.1Purpose ..................................................................................................................................................... 95.2Materials, design and manufacture ........................................................................................................ 95.3Dimensions ............................................................................................................................................. 105.3.1Brake disc ............................................................................................................................................... 105.3.2Hub bore ................................................................................................................................................. 125.3.3Hub oil injection arrangement .............................................................................................................. 145.3.4Access to the axle .................................................................................................................................. 145.3.5Indication of disc wear limits ................................................................................................................ 145.3.6Finishing ................................................................................................................................................. 155.3.7Balance ................................................................................................................................................... 155.3.8Dimensional tolerances ......................................................................................................................... 165.4Performance ........................................................................................................................................... 165.4.1Performance classification ................................................................................................................... 165.4.2Structural distortion or displacement .................................................................................................. 165.4.3Thermal power dissipation ................................................................................................................... 175.4.4Ventilation losses ................................................................................................................................... 175.4.5Noise generation .................................................................................................................................... 175.4.6Frictional performance .......................................................................................................................... 175.4.7Service life .............................................................................................................................................. 175.5Installation .............................................................................................................................................. 176Test methods .......................................................................................................................................... 186.1Type tests (Category A test) ................................................................................................................. 186.1.1General .................................................................................................................................................... 186.1.2Test certificate ........................................................................................................................................ 186.2Homologation tests ................................................................................................................................ 186.3Routine tests .......................................................................................................................................... 18SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 3 6.3.1Verification .............................................................................................................................................. 186.3.2Specifications ......................................................................................................................................... 186.3.3Traceability ............................................................................................................................................. 196.3.4Tests and measurements ...................................................................................................................... 196.3.5Records ................................................................................................................................................... 197Classification and designation ............................................................................................................. 207.1Classification .......................................................................................................................................... 207.2Designation ............................................................................................................................................. 208Marking and packaging ......................................................................................................................... 218.1Marking ................................................................................................................................................... 218.2Packing and protection ......................................................................................................................... 21Annex A (informative)

Situation of temperature sensors .............................................................................. 22Annex B (informative)

Access for non-destructive testing of axles ............................................................. 23Annex ZA (informative)

!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)"""" .................................................................................................................. 24Bibliography ........................................................................................................................................................ 29

SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 4 Foreword This European Standard (EN 14535-1:2005+A1:2011) has been prepared by Technical Committee CEN/TC 256 “Railway applications”, the secretariat of which is held by DIN. 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 November 2011 and conflicting national standards shall be withdrawn at the latest by November 2011. 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. This document includes Amendment 1, approved by CEN on 2011-04-03. This document supersedes EN 14535-1:2005. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". !This document has been prepared under a mandate given to CEN/CENELEC/ETSI by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 2008/57/EC. For relationship with EU Directive 2008/57/EC, see informative Annex ZA, which is an integral part of this document." This EN 14535 consists of the following parts:  Part 1: Brake discs pressed or shrunk onto the axle or drive-shaft, dimensions and quality requirements;  Part 21): Brake discs mounted onto the wheel rim, wheel web or wheel hub, dimensions and quality requirements;  Part 31): Brake discs, performance of the disc and of the pad and disc friction couple, classification. Until Part 3 is made publicly available, the existing relevant national standards or other suitable regulations should be used as an interim solution where prEN 14535-3 is referenced in this document. NOTE On publication of Part 3, Part 1 may be reviewed to take into account any necessary changes. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

1) To be published. SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 5 Introduction The requirements given in this European Standard cannot be written in sufficient detail to ensure good workmanship or proper construction. Each manufacturer is therefore responsible for taking every necessary step to make sure that the quality of design, workmanship and construction is such as to ensure accordance with good engineering practice. SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 6 1 Scope This European Standard specifies requirements for the design, dimensions, performance, and testing of the brake disc, hereafter called “disc”. This European Standard applies to discs secured at the axle or drive-shaft of railway rolling stock by a cylindrical or conic tapered interference fit. For each discrete unit so fitted, one or more disc brake rings, each having two axially separated friction faces, may be deployed. This European Standard applies to discs designed to be fitted to rail vehicles used on the main national networks, urban networks, underground railways, trams and private networks (regional railways, company railways etc.). NOTE This European Standard should be used in association with the standards prEN 15328 and CEN/TC 256 N 185 covering disc brake linings. 2 Normative references Not applicable. 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 brake disc rotor having one or more co-planar annular friction faces for the engagement of brake pads and means of transmitting rotation between itself and the associated axle or drive shaft element NOTE 1 It may absorb and dissipate at least part of the brake energy. NOTE 2 This definition is identical to 4.9.7.10 in EN 14478:2005. 3.2 friction face radially and circumferentially extending planar surface of the disc available for frictional engagement of the brake pad(s) 3.3 brake ring portion of the disc having friction faces NOTE 1 Brake rings constructed from homogenous material between the friction faces are ”homogenous” or otherwise ”non-homogenous”. NOTE 2 Brake rings can consist of one or more sectors and can have continuous or non-continuous friction faces. 3.4 hub portion of the disc having an internal cylindrical or conical surface, the hub bore, for interference fit engagement with the axle or drive shaft NOTE The hub can be constructed integrally with the brake ring (monobloc disc) or connected to it by a separate linking arrangement. SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 7 3.5 non-ventilated disc disc having a continuity of material or materials allowing in that volume no flow of air between the friction faces 3.6 ventilated disc disc in which passages to conduct a flow of cooling air are located between the friction faces of the brake ring NOTE 1 The air flow is usually occasioned by the rotation of the disc. 3.7 single disc disc in which one brake ring is associated with one hub 3.8 double disc disc in which one hub supports two axially spaced brake rings 3.9 brake disc temperature arithmetic average value of the measured temperatures of the disc friction face NOTE The temperatures are measured by six sensors as shown in Annex A. 3.10 maximum permissible disc temperature highest operation temperature related to the application NOTE This may be expressed as an absolute peak value or as a nominal value over a defined period of time. 3.11 maximum permissible rotational speed highest rotational speed related to the application 3.12 direct actuation brake brake in which the brake pad normal force is applied directly 3.13 indirect actuation brake in which the brake pad normal force is applied via a lever system 3.14 part assembly or component uniquely identified 3.15 part number number given to the part by the supplier to designate its characteristics and design 3.16 purchaser vehicle and/or bogie builder, owner, operator or his nominated representative SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 8 3.17 performance class set of the values of brake energy, braking power and brake torque, related to the outer diameter, width and type of the disc, at which it is type tested to demonstrate its capability to withstand these conditions without exceeding the defined limits of structural degradation NOTE Discs are categorized into performance classes according to the tests stated in Part 3 of this European Standard: brake discs, performance of the disc and of the pad and disc friction couple, classification. 3.18 braking energy energy dissipated per disc 3.19 braking torque torque per disc generated by the brake calliper and pad friction value 3.20 braking power braking energy per unit time 4 Symbols and units For the purposes of this European Standard, the symbols and units given in Table 1 apply. Table 1 — Symbols and units Symbol Description Unit d Diametrical dimension mm Ra Surface roughness (arithmetical mean deviation of the assessed profile) µm Rz Surface roughness (maximum height of profile µm R, r Radial dimension mm U Imbalance g · m x Axial dimension mm θ Angular dimension ° or rad

SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 9 5 Requirements 5.1 Purpose The discs are intended to be used as part of a friction brake and shall fulfil the following purposes:  permit a braking moment or torque to be generated, supported and transmitted to the rail vehicle axle or drive shaft element;  permit, by frictional engagement of a brake pad or pads, the conversion into heat of the kinetic and potential energy involved in retarding the vehicle or vehicles which is attributed to the use of the disc brake;  absorb part or all of the kinetic and potential energy arising from the process described previously;  dissipate the absorbed energy by radiation, convection and conduction. In achieving these requirements the disc shall not suffer damage or degradation other than normal wear of the friction face beyond permissible limits. 5.2 Materials, design and manufacture a) The materials, design and manufacture of the disc shall, for all intended operating conditions, take into account the following:  in the case of discs mounted on the axle, the vehicle gauge when the rail wheels are at their minimum permitted diameter;  rotational speed;  magnitude of the brake moment or torque;  quantity of brake energy to be converted and dissipated and its rate of conversion and dissipation;  frictional working conditions, especially of the brake pad;  self ventilating fan driving losses;  noise;  mass of disc;  imbalance of disc;  environmental influence, e.g. storage, transport, climatic, shock and vibration conditions;  integrity, life and maintenance requirements of the disc, associated brake components, and brake and vehicle systems. Where a disc consists of more than one constructional element designed for in-service replacement of the brake ring or part of it, the associated parts of that disc shall be interchangeable while the hub or carrier remains installed on the axle or shaft within the vehicle. SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 10 Where the purchaser specifies that during maintenance procedures the hub bore is to be enlarged, the design shall accommodate such enlargement. The design shall be such as to prevent the detachment of any part of the disc at any braking conditions and at any rotational speed up to the maximum permissible rotational speed in all degraded conditions (e.g. wear, cracking) up to the limits specified by the supplier. NOTE 1 The purchaser may specify special conditions for manufacture. NOTE 2 The purchaser may specify special characteristics for the materials used, etc. 5.3 Dimensions 5.3.1 Brake disc The disc major dimensioning notation shall be as shown in Figure 1 and the preferred ranges of major interface dimensions as specified in Table 2.

SIST EN 14535-1:2006+A1:2011
EN 14535-1:2005+A1:2011 (E) 11
a) x3x4132x5 b) x6x4312 c)
Key 1 Brake ring 2 Linking element 3 Hub a)

Single brake disc symmetrical b) Single brake disc asymmetrical c) Double brake disc

Figure 1 — Disc dimensioning SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 12 Table 2 — Disc major interface dimensions Feature a 1st preference 2nd preference d1 major diameter of 500, 560, 590, 610, 640, 660240 to 760 in steps of 20brakeringb

d3 minor diameter of brake ring ≤ 0,56 d1 If d1 < 660
d3 ≤ 0,56 d1
If d1
≥ 660

d3 ≤ d1 - 290 d2 hub bore diameter 158 to 223 in steps of 5 Any other, to be expressed

as a whole number in mm hub bore diameter d2 + 2 Any other, to be expressed intervalseriesc as a whole number in mm

d4 hub major diameter (in regions ≤ d2
+ 50 Any other, to be expressed x4and x5)
as a whole number in mm x1 brake ring width

- ventilated 130, 110, 90, 80 30 to 180 in steps of 10 - non-ventilated 45 20 to 60 in steps of 10 x2hubwidth(overall)d150 80 to 220 in steps of 10 x3disc/huboffsete f0 10 to 120 in steps of 10 x6 distance of brake ring centre 330 240 to 360 in steps of 10 θ bore taper - radians 0 0,0016 to 0,025 6 in steps of 0,0016 a The preferences for dimensions are individually exclusive, e.g. a particular disc could have a major brake ring diameter of 640 (1st preference) combined with a brake ring width of 70 (2nd preference), being thereby 2nd preference. Manufacturers and purchasers shall, wherever possible, specify 1st preference dimensional combinations. b In some forms of disc construction the friction face major diameter may be less than the brake ring major diameter. c To permit assembly of more than one disc from one end of the axle. d Where the width of the interference fit portion of the hub (including entry and exit features) is less than x2 , the disc shall be classed as 2nd preference. e The offset may be employed when one or more brake rings are associated with one hub. f Where e x3 ≠ 0, the taper shall be optional but shall be specified by the purchaser.

5.3.2 Hub bore The form of the disc hub bore entry and exit features shall be agreed between purchaser and supplier. Two recommended designs are shown in Figures 2a and 2b. The first preference shall be as shown in Figure 2a.

SIST EN 14535-1:2006+A1:2011
EN 14535-1:2005+A1:2011 (E) 13
d2R 2,5
Figure 2a — Hub bore entry feature
4 ± 115û-5û0û30ûR 2 ± 11d2
Key 1 Hub
Figure 2b — Hub bore entry feature
SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 14 5.3.3 Hub oil injection arrangement Unless the purchaser requests otherwise, a suitable hole and groove feature shall be incorporated to facilitate pressurized liquid assisted (”oil-injection”) assembly and/or disassembly of hub and axle or shaft. The first preference connection interface is shown in Figure 3.

0,5R 10R5 5G 1/4 25213120º0,5
X245xx
Key 1 Plug 2 Seal washer 3 Width across flats 4 Angle to suit hub design 5 Hub

Figure 3 — Oil-injection groove and connection 5.3.4 Access to the axle If the combination of dimensions x1, x2, x3, is such that the dimension x4 (see Figure 1) takes a negative sense and access is required, for example, to the axle for non-destructive testing, the purchaser shall specify the appropriate envelope dimensions for such access. An example of a dimensional envelope is given in Annex B. 5.3.5 Indication of disc wear limits Unless otherwise agreed between supplier and purchaser, a wear limit form shown in Figure 4 shall be present on the disc outside circumference to indicate the limit of acceptable wear.

SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 15 1x1d1b Key 1 Wear limit indication b Depth of wear limit indication (nominal 1,5) a

Wider wear limits may be agreed between the purchaser and manufacturer. Figure 4 — Wear limit indication 5.3.6 Finishing The surface roughness shall be such as to avoid unacceptable stress rise, and for the friction faces and hub bore shall be, except where otherwise specified by the purchaser: friction faces:

16 µm; hub bore:

0,8 µm to 3,2 µm. Any other requirement for surface roughness, for example to facilitate non-destructive testing or use of new materials, shall be specified by the purchaser. No sharp corners or edges which could be a danger to those persons handling the discs shall be present. 5.3.7 Balance The imbalance of new discs and those having a service replacement brake ring, or part of such, shall be within the following values: Imbalance class 1: a value as specified by the purchaser, U ≤ 10 g·· m; Imbalance class 2: 10 g·· m < U ≤ 16 g·· m; Imbalance class 3: Value as specified by the purchaser. Single discs shall be at least statically balanced, any other shall be dynamically balanced unless otherwise agreed between supplier and purchaser. The process used, where necessary, to achieve the balance requirement shall, unless otherwise agreed between supplier and purchaser, be one of material removal, through removal of material from an area which is not critical to the disc strength. SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 16 5.3.8 Dimensional tolerances For discs having a maximum declared rotational speed of up to and including 2 200 rpm the tolerances as shown in Table 3 shall apply: Table 3 — Dimensional tolerances Dimensional feature Tolerance

(mm or class)

Indirect actuationDirect actuation Friction face flatness 0,1 0,025 Friction face parallelism 0,2 0,04 Friction face run-out relative to hub bore axis 0,5 0,08 Friction face axial symmetry and asymmetry 0,3 0,3 Major diameter, d1 +0 –1 Hub bore, d2 H6 Minor diameter, d3 ±1 Brake ring width x1 +0 -0,3 Concentricity of major diameter and hub bore 0,1

For discs having a maximum declared rotational speed lower than 1 000 rpm or greater than

2 200 rpm the tolerances may be as otherwise agreed between the supplier and purchaser. 5.4 Performance 5.4.1 Performance classification Discs of the same size may have different capabilities to convert brake power and absorb and dissipate brake energy due to the disc design, materials and manufacture. Discs are therefore classified for performance by the supplier according to a standardized test program in order to facilitate selection by the user, within a performance class. Performance classification is specified in prEN 14535-3. 5.4.2 Structural distortion or displacement a) On completion of a category A (see 6.1) braking programme as described in the stop braking and power dissipation parts of the type test, the following dimensional and surface degradation criteria, using the hub bore d2 as a datum, shall be met. The imbalance value shall not exceed 1,2 times that shown in 5.3.7. b) At the friction face between diameters of 10 mm less than the disc major diameter and 10 mm greater than the disc minor diameter shall not exceed for: 1) corrugation (undulating deformation of the friction faces) ≤ 0,1 mm for indirect actuation and 0,025 mm for direct actuation; 2) swashing (helicoidal deformation of the friction faces) ≤ 0,5 mm for both, indirect actuation and direct actuation; 3) buckling (cone-shaped deformation of the friction faces) ≤ 0,1 mm for indirect actuation and 0,025 mm for direct actuation. c) The circumferential gap remaining after one radial cut of width 4 mm to 6 mm has been made completely through the disc, in the case of a mono-bloc disc between the major diameter and the SIST EN 14535-1:2006+A1:2011

EN 14535-1:2005+A1:2011 (E) 17 hub bore, but otherwise between the major and minor diameters of the brake ring, shall be within 3 mm of the cutter width. NOTE This test is not applicable for segmented brake rings. d) No crack longer than 5 mm shall be present on the friction faces. Cracks have to be verified by approved test methods. The corresponding values after a category C2 (in accordance with prEN 14535-3) test shall be as agreed between the purchaser and the supplier

5.4.3 Thermal power dissipation Where required by the purchaser, the supplier shall declare the constant brake moments which, without enhanced forced air ventilation in accordance with prEN 14535-3, and at the three speeds comprising 0,6, 0,4 and 0,2 of the maximum declared rotational speed, cause the brake ring stabilized temperature to be the maximum declared disc temperature and 0,75 and 0,5 of the difference between that temperature and 20 °C. 5.4.4 Ventilation losses Where required by the purchaser, the supplier shall declare the ventilation losses in still air in accordance with prEN 14535-3. 5.4.5 Noise generation The noise generated by an unbraked rotating ventilated disc where the maximum declared speed is such that the corresponding circumferential speed exceeds 90 m/s shall not exceed 115 dBA in accordance with the conditions specified in prEN 14535-3. 5.4.6 Frictional performance Under the working c

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