ISO 26865:2009 道路車両—ブレーキライニング摩擦材—エアブレーキ付き商用車の標準性能試験手順 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally 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 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 prepare 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 some 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.

Introduction

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 is 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 as 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 Society 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 correspond with one another because the test procedures and test conditions are not the same.

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 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 material’s adequacy for use in a certain application, market or vehicle platform.

This International 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 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 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 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.

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 following apply.