1、BS ISO26865:2009ICS 43.040.40,NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDRoad vehicles Brake lining frictionmaterials Standardperformance testprocedure forcommercial vehicleswith air brakesThis British Standardwas published under theauthority of the Standar
2、dsPolicy and StrategyCommittee on 30 April2009 BSI 2009ISBN 978 0 580 60376 1Amendments/corrigenda issued since publicationDate CommentsBS ISO 26865:2009National forewordThis British Standard is the UK implementation of ISO 26865:2009.The UK participation in its preparation was entrusted to Technica
3、lCommittee AUE/11, Braking systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Stan
4、dard cannot confer immunityfrom legal obligations.BS ISO 26865:2009Reference numberISO 26865:2009(E)ISO 2009INTERNATIONAL STANDARD ISO26865First edition2009-03-15Road vehicles Brake lining friction materials Standard performance test procedure for commercial vehicles with air brakes Vhicules routier
5、s Matriaux de friction pour garnitures de freins Mode opratoire dessai des performances normalises pour les vhicules utilitaires munis de freins air comprim BS ISO 26865:2009ISO 26865:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, thi
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10、el. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 26865:2009ISO 26865:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and d
11、efinitions. 2 4 Symbols . 3 5 Sampling 3 6 Test method. 3 6.1 Principle. 3 6.2 Test equipment and parts 3 6.3 Test conditions . 4 6.4 Test procedure for disc brake systems 5 6.5 Test procedure for drum brake systems 9 6.6 Expression of results . 12 7 Test report . 13 7.1 Tabular report 13 7.2 Summar
12、y of results 13 7.3 Lining data sheet 13 BS ISO 26865:2009ISO 26865:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is no
13、rmally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in
14、 the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepa
15、re International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that so
16、me of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 26865 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. BS ISO 26865:2009ISO 268
17、65:2009(E) ISO 2009 All rights reserved vIntroduction The standardization of performance testing friction for commercial vehicle application is a major challenge for technical groups around the world in their efforts to harmonize procedures. The diverse conditions under which the friction material i
18、s tested and evaluated ensure a wide spectrum of data, which is critical during the various phases of product life (i.e. product and manufacturing process development; production validation; quality control; product auditing; field issues evaluation). This International Standard has been developed a
19、s part of the friction material global harmonization programme outlined in ISO 15484 and is the product of a close collaboration between major car manufacturers, brake system and component manufacturers, leading testing services and standards development organizations e.g. SAE and JSAE (Japanese Soc
20、iety of Automotive Engineers). The introduction by various truck and trailer manufacturers of a wide range of performance tests has proven time-consuming and has led to multiple evaluations of the same friction material for the same application. The test results thus provided do not necessarily corr
21、espond with one another because the test procedures and test conditions are not the same. BS ISO 26865:2009BS ISO 26865:2009INTERNATIONAL STANDARD ISO 26865:2009(E) ISO 2009 All rights reserved 1Road vehicles Brake lining friction materials Standard performance test procedure for commercial vehicles
22、 with air brakes 1 Scope This International Standard applies to commercial vehicles of the categories M2, M3, N2, N3, O3 and O4, as defined in UNECE R.E.3, which are equipped with air brakes. This International Standard applies during product development, product prototypes, product specification or
23、 validation, and ongoing series production, as defined in ISO 15484. When used in conjunction with other applicable standards or test procedures, this International Standard is intended to provide a complete assessment of a friction materials adequacy for use in a certain application, market or vehi
24、cle platform. NOTE Applicable standards and test procedures include ISO, JIS/JASO (Japanese Industrial Standard/Japanese Automotive Standards Organization), SAE (Society of Automotive Engineers), Federal Codes or regulations, and other project or company-specific testing programmes. This Internation
25、al Standard does not include performance requirements related to stopping distance or braking force distribution, under different vehicle conditions of speed, temperature, tyre-to-road adhesion, loads and operating conditions of the braking system, as indicated in Federal Codes or Regulations. This
26、International Standard specifies a single-ended inertia-dynamometer performance procedure, which is intended to standardize the various procedures for commercial vehicles equipped with air brakes into one unique procedure covering all performance requirements of interest. The test sequence includes
27、performance evaluation for the following conditions: performance test before and after bedding; brake fade after bedding and after moderate temperature; sensitivity to temperature, speed and pressure influence; downhill simulation; brake recovery. 2 Normative references The following referenced docu
28、ments 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. ISO 611:2003, Road vehicles Braking of automotive vehicles and their trailers
29、Vocabulary BS ISO 26865:2009ISO 26865:2009(E) 2 ISO 2009 All rights reservedISO 1176, Road vehicles Masses Vocabulary and codes ISO 3833, Road vehicles Types Terms and definitions ISO 11157:2005, Road vehicles Brake lining assemblies Inertia dynamometer test method ISO 15484:2008, Road vehicles Brak
30、e lining friction materials Product definition and quality assurance UNECE R.E.3 (1999), Consolidated Resolution on the Construction of Vehicles 3 Terms and definitions For the purposes of this document, the terms and definitions given in UNECE R.E.3, ISO 611, ISO 1176, ISO 3833, ISO 15484 and the f
31、ollowing apply. 3.1 air brake system braking system in which control and energy are transmitted from the point of application to the foundation brakes by air/pneumatic transmission devices 3.2 axle load technically feasible maximum design total mass specified by the vehicle or axle manufacturer and
32、acknowledged by the Technical Services NOTE This mass can exceed the “maximum authorized total mass” permitted by national regulations. Unless otherwise specified by the test requestor, the axle loads indicated in Table 2 are used to determine the test inertia. 3.3 brake type brake sizes determined
33、by the nominal rim diameter code in accordance with Table 2 NOTE The same nominal rim diameter can have different tyre dynamic rolling radius. Information pertaining to other nominal rim sizes or tyre dynamic radius can be obtained from the test requestor. 3.4 brake temperature temperature measured
34、on the disc or drum at the centre of the path followed by the lining 3.5 test inertia part of the total inertia of the vehicle braked by the wheel under consideration, in accordance with Table 2 NOTE For other loads or tyre sizes, see ISO 11157. 3.6 wheel load half of the axle load (3.2) BS ISO 2686
35、5:2009ISO 26865:2009(E) ISO 2009 All rights reserved 34 Symbols Table 1 Symbols Symbol Description Unit dmMean fully developed deceleration (MFDD) m/s2I Test inertia kgm2m Mass acting on the ground for the wheel(s) under consideration kg MdBrake measured torque Nm pBBrake actuating pressure bar rdyn
36、Tyre dynamic rolling radius m TRRoom temperature C TETemperature at end of braking C TIInitial temperature at beginning of braking C VairVelocity of the cooling air km/h VBPad or lining wear mm, g VESpeed at the end of braking km/h VIInitial speed at beginning of braking km/h VsRotor or drum wear mm
37、, g fadePercent difference between initial and minimum MFDD values during electrical and computer engineering (ECE) fading steps % tDuration of a braking cycle: time elapsing between the initiation of one brake application and the initiation of the next s 5 Sampling Unless otherwise specified by the
38、 test requestor, sampling shall be conducted in accordance with ISO 15484:2008, 5.3. 6 Test method 6.1 Principle This International Standard uses a single-ended brake inertia-dynamometer to conduct the test. The inertia-dynamometer provides a computer-controlled method to perform the test sequence,
39、controlling the different parameters to ensure the accurate and repeatable evaluation of the different tests. The control system of the inertia-dynamometer also records the in-stop values that allow the subsequent generation of a complete test report to the requestor. 6.2 Test equipment and parts 6.
40、2.1 An inertia-dynamometer having the characteristics specified in 6.2.2 to 6.2.4 shall be used for the test. 6.2.2 The inertia-dynamometer shall be capable of generating as close as possible, with a tolerance of 5 %, the inertia specified in 6.3.1 or the test inertia indicated by the test requestor
41、. BS ISO 26865:2009ISO 26865:2009(E) 4 ISO 2009 All rights reserved6.2.3 The brake fitted shall be identical to the intended use type and oriented as close as possible to the vehicle mounting position. Inconsequential changes to the lining configuration are permitted (i.e. chamfers, slots, wear indi
42、cators, noise shims, etc.) 6.2.4 The instrumentation for the test shall be capable of providing at least the following data: a) continuous recording of disc or drum rotational speed; b) number of revolutions completed during a brake application; c) stopping time; d) continuous recording of the tempe
43、rature on the disc and pads or the drum and lining; e) continuous recording of control line pressure or force during a brake application; f) continuous recording of brake output torque. 6.3 Test conditions 6.3.1 Test inertia and tyre dynamic rolling radius shall be in accordance with Table 2. Table
44、2 Test conditions Brake manufacturer Brake typeaAxle load kg rdynm Test inertia kgm2Remarks All 22,5” 10 000 0,527 1 389 All 19,5” 9 000 0,518 1 267 Trailers All 19,5” 9 000 0,446 895 Trucks All 17,5” 6 600 0,407 547 aThe brake chamber shall be selected in coordination with the brake manufacturer. 6
45、.3.2 The initial rotational speed of the inertia-dynamometer shall correspond to the test speeds as specified in Table 3 and shall be based on the tyre dynamic rolling radius. 6.3.3 Cooling air at ambient temperature may be used, directly perpendicular to the axis of rotation of the brake. The veloc
46、ity of the cooling air over the brake, Vair, expressed in km/h, shall be as calculated in Equation (1): air I0,33VV= (1) where VIis the initial speed at the beginning of braking, in km/h. 6.3.4 When required, heat up the brake to the required temperature by performing brake applications from 60 km/h
47、 to 20 km/h at 0,3 MPa 1)brake pressure. 1) 1 bar = 0,1 MPa. BS ISO 26865:2009ISO 26865:2009(E) ISO 2009 All rights reserved 56.4 Test procedure for disc brake systems Table 3 specifies the test procedure for disc brake systems. Table 3 Test procedure for disc brakes Step Brake applications Section
48、Number of applicationsBrake pressure MPa aVIkm/h VEkm/h TIC TEC ts 1. Parts measurement 2. Initial adjustment to 2,0 mm clearance 3. 1 to 50 Stroke adjustment 50 0,2 0 0 TR4. 51 to 51 Stroke measurement 1 0,9 0 0 TRGreen performance 5. 52 to 57 Performance versus pressure one at each pressure 0,15;
49、0,3; 0,45; 0,6; 0,75; 0,9 60 0,5 100 6. 58 to 157 Bedding 100 0,3 60 20 150 Performance after bedding 7. 158 to 163 Performance versus pressure 40 km/h one at each pressure 0,15; 0,3; 0,45; 0,6; 0,75; 0,9 40 0,5 100 8. 164 to 164 Stroke measurement 1 0,9 0 0 100 9. 165 to 170 Performance versus pressure 60 km/h one at each pressure 0,15; 0,3; 0,45; 0,6; 0,75; 0,9 60 0,5 100 10. 171 to 176 Performance versus pressure 80 km/h o
