SIST EN 14535-2:2011
(Main)Railway applications - Brake discs for railway rolling stock - Part 2: Brake discs mounted onto the wheel, dimensions and quality requirements
Railway applications - Brake discs for railway rolling stock - Part 2: Brake discs mounted onto the wheel, dimensions and quality requirements
This European Standard specifies requirements for brake discs mounted onto the wheel rim, wheel web or wheel hub of railway rolling stock.For each discrete unit so fitted, one or more disc brake rings, each having one friction face, may be deployed.This European Standard is applicable to discs designed to be fitted to rail vehicles used on the main national networks, urban networks, underground railways, trams, private networks (regional railways, company railways, etc.).
Bahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 2: Bremsscheiben, die an einem Rad befestigt werden, Abmessungen und Qualitätsanforderungen
Diese Europäische Norm legt die Anforderungen fest, die für Konstruktion, Abmessungen, Leistung und Prüfung der Bremsscheibe zu erfüllen sind.
Diese Europäische Norm gilt für Bremsscheiben, die auf dem Rad, einschließlich der Radscheibe oder der Radnabe, von Schienenfahrzeugen befestigt werden.
Jede einzelne derart 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.
Zusätzlich zu den allgemeinen Anforderungen fordert diese Europäische Norm darüber hinaus, dass die in Abschnitt 5 aufgeführten Einzelheiten zu dokumentieren sind. Für die Übereinstimmung mit dieser Europäischen Norm sind sowohl die allgemeinen Anforderungen als auch die dokumentierten Einzelheiten zu erfüllen.
Applications ferroviaires - Disques de frein pour matériel roulant ferroviaire - Partie 2: Disques de frein montés sur la roue, 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.
La présente Norme européenne s’applique aux disques de frein montés sur la roue, que ce soit sur la toile ou le moyeu de la roue d’un matériel roulant ferroviaire.
Chaque unité ainsi fixée peut comprendre une ou plusieurs couronnes de disque de frein, chaque couronne ayant une surface de friction.
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.).
En plus des exigences communes, la présente Norme européenne exige aussi que les éléments énumérés à l'article 5 soient documentés. Pour satisfaire à cette Norme européenne, les exigences communes et les éléments documentés doivent à la fois être respectés.
Železniške naprave - Kolutne zavore za železniška vozila - 2. del: Kolutne zavore, nameščene na kolo, mere in zahteve za kakovost
Ta evropski standard določa zahteve za kolutne zavore, nameščene na platišče, napere ali pesto kolesa železniških vozil. Za vsako tako opremljeno ločeno enoto se lahko uporabi en ali več obročev kolutnih zavor, vsak z eno torno ploskvijo. 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
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 2: Bremsscheiben, die an einem Rad befestigt werden, Abmessungen und QualitätsanforderungenApplications ferroviaires - Disques de frein pour matériel roulant ferroviaire - Partie 2: Disques de frein montés sur la roue, dimensions et exigences de qualitéRailway applications - Brake discs for railway rolling stock - Part 2: Brake discs mounted onto the wheel, dimensions and quality requirements45.040Materiali in deli za železniško tehnikoMaterials and components for railway engineeringICS:Ta slovenski standard je istoveten z:EN 14535-2:2011SIST EN 14535-2:2011en,fr,de01-november-2011SIST EN 14535-2:2011SLOVENSKI
STANDARD
SIST EN 14535-2:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14535-2
June 2011 ICS 45.060.01 English Version
Railway applications - Brake discs for railway rolling stock - Part 2: Brake discs mounted onto the wheel, dimensions and quality requirements
Applications ferroviaires - Disques de frein pour matériel roulant ferroviaire - Partie 2: Disques de frein montés sur la roue, dimensions et exigences de qualité
Bahnanwendungen - Bremsscheiben für Schienenfahrzeuge - Teil 2: Bremsscheiben, die an einem Rad befestigt werden, Abmessungen und Qualitätsanforderungen This European Standard was approved by CEN on 4 May 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 14535-2:2011: ESIST EN 14535-2:2011
EN 14535-2:2011 (E) 2 Contents Page Foreword .3Introduction .41Scope .52Normative references .53Terms and definitions .54Symbols .75Items to be agreed between contracting parties and documented .75.1Information to be supplied .75.2Items for agreement .86Requirements .96.1Purpose .96.2Materials, design and manufacture.96.3Dimensions . 106.4Performance . 156.5Installation . 187Test methods . 187.1Type tests (Category A test) . 187.2Application test . 187.3Routine tests . 198Classification and designation . 208.1Classification . 208.2Designation . 209Marking and packaging . 219.1Marking . 219.2Packing and protection . 22Annex A (informative)
Experimentation in service (checking of the operating requirement) category C2 test . 23Annex ZA (informative)
Relationship between this European Standard and the
Essential Requirements of EU Directive 2008/57/EC . 24Bibliography . 27 SIST EN 14535-2:2011
EN 14535-2:2011 (E) 3 Foreword This document (EN 14535-2:2011) 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 December 2011 and conflicting national standards shall be withdrawn at the latest by December 2011. 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 series of European Standards Railway applications — Brake discs for railway rolling stock consists of: Part 1: Brake discs pressed or shrunk onto the axle or drive-shaft, dimensions and quality requirements [1] Part 2: Brake discs mounted onto the wheel, dimensions and quality requirements Part 3: Brake discs, performance of the disc and of the pad and disc friction couple, classification1) 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. 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 2 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 the United Kingdom.
1) To be published. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 4 Introduction This European Standard gives the requirements to be met for the design, dimensions, performance and test-ing of the brake disc, hereafter called "disc”. These requirements cannot be written in sufficient detail to en-sure 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 14535-2:2011
EN 14535-2:2011 (E) 5 1 Scope This European Standard specifies requirements to be met for the design, dimensions, performance and testing of the brake disc. This European Standard applies to brake discs mounted onto the wheel, including the wheel web or wheel hub of railway rolling stock. For each discrete unit so fitted, one or more disc brake rings, each having one friction face, may be deployed. This European Standard applies to discs designed to be fitted to rail vehicles used on the main national net-works, urban networks, underground railways, trams, private networks (regional railways, company railways, etc.). In addition to the common requirements, this European Standard also requires the items detailed in Clause 5 to be documented. For compliance with this European Standard, both the common requirements and the documented items need to be met. 2 Normative references The following referenced documents are indispensable for the application 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 14478:2005, Railway applications — Braking — Generic vocabulary prEN 153282), Railway applications — Braking — Brake pads 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14478:2005 and the following 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 web or hub 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 the friction face
2) To be published. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 6 NOTE 1 Brake rings having a continuity of material allowing in that volume no flow of air are ”non-ventilated”. Otherwise they are ”ventilated”. NOTE 2 Brake rings being of homogenous material construction behind the friction face are ”homogenous” or otherwise ”non-homogenous”. NOTE 3 Brake rings may consist of one or more sectors and may have continuous or non-continuous friction faces. NOTE 4 Split brake rings are those which are separated into two halves. Segmented brake rings are those which are separated into more than two parts. 3.4 fastening area portion of the disc having means for the fastening on the wheel NOTE The fastening area may be constructed integral with the brake ring or connected to it by a separate linking arrangement. 3.5 non-ventilated disc (solid disc) disc having a continuity of material or materials extending from the friction face axially to the rear face so preventing the flow of air through the body of the disc 3.6 ventilated disc disc in which passages to conduct a flow of cooling air are located between the friction ring and the web of the wheel NOTE The airflow is usually occasioned by the rotation of the disc. 3.7 maximum permissable disc temperature highest operating 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. 3.8 split disc disc in which the brake ring is separated in two halves 3.9 segmented disc disc in which the brake ring is separated in more than two parts 3.10 maximal permissible rotational speed highest rotational speed related to the application 3.11 direct actuation brake in which the brake pad normal force is applied directly (as in the case of an ”automobile” type of brake caliper) 3.12 indirect actuation brake in which the brake pad normal force is applied via a lever system 3.13 part uniquely identified pattern of a detail in an assembly or a component SIST EN 14535-2:2011
EN 14535-2:2011 (E) 7 3.14 identification number number for identification of the part, item or article 3.15 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 the performance classes according to the tests to be covered in prEN 14535-33): Brake discs, performance of the disc and of the pad and disc friction couple, classification. 3.16 braking energy energy dissipated per disc 3.17 braking torque torque per disc generated by the brake calliper and the pad friction value 3.18 braking power braking energy per unit time 4 Symbols For the purpose of this European Standard, the following symbols 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 U Imbalance g · m x Axial dimension mm
5 Items to be agreed between contracting parties and documented 5.1 Information to be supplied The following information to be supplied shall be fully documented. For compliance with the standard both the common requirements specified throughout the standard and the following documented items shall be satisfied: any special conditions for manufacture and any special characteristics for the materials used (6.2,
Note 1);
3) To be published. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 8 access to the wheel for testing and checking without dismantling the disc, including envelope dimensions (6.3.2, note); any requirement for surface roughness other than that specified in this standard (6.3.4, note); values for imbalance class 3, if appropriate (6.3.5, note); approved test method for crack detection (6.4.2); whether a declaration of the constant brake moment is required (6.4.3, note); whether a declaration of the ventilation losses is required (6.4.4, note); environmental conditions, which the disc is required to be able to withstand (6.4.7); identification and traceability of the manufacturing process of the discs and their component parts at all stages of production, inspection and delivery (7.3.3); format, storage medium and retrieval system for records if other than the normal practice of the supplier (7.3.5, Notes 1 and 2); method of marking if other than those specified in this European Standard (9.1.3). NOTE Usually these items of information are supplied by the purchaser. 5.2 Items for agreement The following items to be agreed between the contracting parties are specified in the clauses referred to and shall be fully documented. For compliance with the standard both the common requirements specified throughout the standard and the following documented items shall be satisfied: form of the disc fastening areas features (6.3.1, note); indication of disc wear limits (6.3.3); process used to achieve the imbalance requirement other than that specified in this European Standard (6.3.5); dimensional tolerances for discs having a maximal permissible rotational speed greater than 2 200 rpm (6.3.6); maximum values for corrugation, swashing and buckling for disc designs other than those in which the fastening points are centred (6.4.2); corresponding values after a category C2 test (6.4.2, 7.2 and Annex A); performance test (category B, C1) (6.4.6 and 7.2); in-service limit (6.4.7); method of calculation for verification of requirements for wheel and brake disc (6.5); any additional marking (9.1.2); packing and protection (9.2); time duration or number of kilometres for test (Annex A); SIST EN 14535-2:2011
EN 14535-2:2011 (E) 9 number of discs and vehicles used for the checking of the operating requirement (Annex A); any controls to be realized and prescriptions to be met before and/or after the checking test of operating requirement (Annex A); pass-fail criteria (Annex A). 6 Requirements 6.1 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 wheel; 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 wear, surface cracks and deformations of the friction face beyond permissible limits. 6.2 Materials, design and manufacture The materials, design and manufacture of the disc shall, for all intended operating conditions, take into ac-count: in the case of discs mounted on the wheel, the vehicle gauge when the road wheels are at their minimum permitted diameter and width; the rotational speed; the magnitude of the braking torque; the quantity of brake energy to be converted and dissipated and its rate of conversion and dissipation; the frictional working conditions, especially with the interaction with the brake pad; self-ventilating fan driving losses; noise; mass of disc; imbalance of the disc; environmental influence, e.g.: storage, climatic, shock and vibration conditions; the integrity, life and maintenance requirements of the disc, associated brake components, and brake and vehicle systems; SIST EN 14535-2:2011
EN 14535-2:2011 (E) 10 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 fastening area or carrier remains installed on the wheel within the vehicle; the design shall be such as to prevent the detachment of any part of the disc at any speed up to and in-cluding the maximal permissible speed in all degraded conditions (e.g. wear, cracking) up to the limits specified by the supplier. If any special conditions for manufacture and special characteristics for the materials used are necessary, they shall be specified and documented. NOTE 1 Generally, the special conditions for manufacture and special characteristics for the materials are stated by the purchaser. NOTE 2 The manufacturer should operate a quality management system that offers equivalence with EN ISO 9001 [2]. 6.3 Dimensions 6.3.1 Characteristics of dimensions and areas for the fastening Examples of the disc fastening areas are shown in Figure 1. All fastening areas may be used solely or in any combination. The preferred ranges of major fastening and interface dimensions are shown in Table 2. The measures are explained in Figure 2. NOTE The form of the disc fastening areas features should be agreed between the contracting parties. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 11
Key View Denomination Fastening area position A Outer Close to wheel rim B Central Middle of the web C Inner Close to wheel hub D Hub Directly to the wheel hub Figure 1 — Disc, definition of fastening areas SIST EN 14535-2:2011
EN 14535-2:2011 (E) 12
a) Attachment on web of the wheel
b) Attachment on hub of the wheel
Figure 2 — Disc major interface measures SIST EN 14535-2:2011
EN 14535-2:2011 (E) 13 Table 2 — Disc major interface dimensions a Feature 1st preference 2nd preference d1 major diameter of brake ring b 610 mm, 640 mm, 660 mm, 680 mm, 700 mm, 710 mm, 725 mm, 750 mm, 800 mm, 840 mm, 880 mm, 940 mm,
1 040 mm, 1 085 mm other diameters from 550 mm to
1 100 mm in any gradation d3 minor diameter of brake ring If d_1 < 660 mm Æ d_3 ≤ 0,56 × d_1 If d_1 ≥ 660 mm Æ d_3 = d_1 – 290 mm any other smaller size d2 fastening area pitch diameter
Fastening on wheel web to be adapted with the wheel design to be adapted with the wheel design Fastening on wheel hub
to be adapted with the wheel design to be adapted with the wheel design d4 fastening area bore diameter to be adapted with the wheel design d to be adapted with the wheel design dx1 brake ring width c
– ventilated (135 – max. wheel web width)/2 any other – non-ventilated distance of the mounting faces any other
depending on wheel design wheel web width
depending on wheel design a The preferences for dimensions are individually exclusive, e.g.: a particular disc could have a major brake ring diameter of 650 mm (1st preference) combined with a brake ring width of 70 mm (2nd preference), being thereby 2nd preference. 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 An offset may be employed when the wheel web is not associated symmetrically to the wheel rim. d See EN 13260 [3], EN 13261 [4] and EN 13262 [5]
6.3.2 Access to the wheel An access to the wheel for testing and checking the wheel web without dismantling of the disc shall be provided if required. The appropriate envelope dimensions for such access shall be specified. NOTE Generally, the specification is given by the purchaser. 6.3.3 Indication of disc wear limits Unless otherwise agreed between the contracting parties, a spigot of the form shown in Figure 3 shall be present on the disc inside and outside circumference to indicate the limit of acceptable wear. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 14 Dimensions in millimetres
Key s amount of maximum permitted wear Figure 3 — Wear limit indication spigot 6.3.4 Finishing The surface roughness shall be such as to avoid unacceptable stress rise. For the friction faces and fastening area bore shall be: friction faces:
Rz ≤ 16 µm; contact faces to the wheel:
Rz ≤ 25 µm. NOTE Any other requirement for surface roughness, for example to verify the Ra to facilitate non-destructive testing, should be specified. Generally, the specification is given by the purchaser. The values should be given in the required evaluation method (Ra or Rz). Corners at friction faces with holes and gaps between wear parts may be chamfered 45° to a depth of at least the calculated wear to the next turning operation. 6.3.5 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: U ≤ 10 gm Imbalance class 2: U ≤ 16 gm Imbalance class 3: Other value. NOTE The purchaser may define the required value for his application. The discs may be statically balanced. The process used, where necessary, to achieve the imbalance requirement shall, unless otherwise agreed between the contracting parties, be through removal of material from an area which is not critical to the disc strength. The imbalance of a set of two brake rings assembled to a wheel shall not exceed 1,5 times the imbalance of a single brake ring. This can be easily achieved when the brake rings are assembled in a position in which the residual imbalances compensate each other. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 15 6.3.6 Dimensional tolerances For discs having a maximal permissible rotational speed up to and including 1 000 rpm, the tolerances and limit deviations in Table 3 should apply and between 1 000 rpm and 2 200 rpm the tolerances and limit deviations in Table 3 shall apply. Table 3 — Dimensional tolerances Dimensions in millimetres Dimensional feature Tolerance/limit deviation (mm or performance class) Indirect actuation Direct actuation Friction face flatness
0,1 0,025 Parallelism of friction faces
0,3 0,2 Friction face run-out relative to fastening area bore axis
0,25 0,1 Major diameter, d1 [0, –1] Fastening area bore, d, in the wheel ± 0,05 Minor diameter, d3 ± 2 Brake ring width x1 [0; - 0,3] Concentricity of major diameter and fastening area bore 0,5 Friction face to assembly face 0,1 Required tolerance for parallelism of wheel assembly faces 0,1
For discs having a maximal permissible rotational speed greater than 2 200 rpm the tolerances may be as otherwise agreed between the contracting parties. 6.4 Performance 6.4.1 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. The disc shall be classified by performance in order to facilitate selection according to the application in accordance with a standardized test programme. Performance classification is specified in prEN 14535-34). NOTE It is intended that 6.4.1 will be superseded by EN 14535-3 when issued. 6.4.2 Structural distortion or displacement On completion of a ”category A” (see 7.1) 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 fastening area pitch diameter d2 as a datum, shall be met.
4) To be published. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 16 The imbalance value shall not exceed 1,2 times that measured before the performance test with the disc assembled to the wheel. For circumferences of diameters 10 mm less than the disc major diameter and 10 mm greater than the disc minor diameter the corrugation, swashing and buckling shall not exceed the values given in Table 4, providing the fastening points are centred. Table 4 — Maximum values for corrugation, swashing and buckling Dimensions in millimetres Parameter DescriptionIndirect actuation Direct actuationCorrugation undulating deformation of the friction faces ≤ 0,5 0,05 Swashing helicoidal deformation of the friction faces ≤ 1,0 ≤ 1,0 Buckling cone-shaped deformation of the friction faces 4,0 0,5
These values are only applicable if the fastening points are centred. For other designs the limits should be agreed between the contracting parties. After one radial cut has been made completely through the disc with a cutter of width 4 mm to 6 mm, the circumferential gap remaining for a monobloc disc, between the major diameter and the fastening area bore; for all other discs, between the major and minor diameters of the brake ring; shall be ± 3 mm of the cutter width. This test is not applicable for segmented brake rings. 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” (see 7.2 and Annex B) test shall be as agreed between the contracting parties. 6.4.3 Thermal power dissipation If required, the constant brake moments shall be declared which, without enhanced forced air ventilation as described in prEN 14535-35), and at the three speeds comprising 0,6, 0,4 and 0,2 of the maximal permissible rotational speed, cause the brake ring stabilised temperature to be the maximum declared disc temperature and 0,75 and 0,5 of the difference between that temperature and 20 °C.
5) To be published. SIST EN 14535-2:2011
EN 14535-2:2011 (E) 17 NOTE Usually the requirement for the declaration is stated by the purchaser. 6.4.4 Ventilation losses If a declaration of the ventilation losses is required, it shall be determined as described in prEN 14535-36). NOTE Usually the requirement for the declaration is stated by the purchaser. 6.4.5 Noise generation The noise generated by an unbraked rotating ventilated disc where the maximal permissible speed is such that the corresponding circumferential speed exceeds 90 m/s shall not exceed 115 dBA under the conditions defined in prEN 14535-37). NOTE As measuring conditions of disc noise and TSI train noise are different, the disc noise limit does not guarantee that the train will fulfil TSI noise regulations. 6.4.6 Frictional performance 6.4.6.1 Performance tests at the bench When performance test (category B, C1) are agreed between the contracting parties, they shall be performed
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