BS-AU-180-4-1982 ISO-6313-1980.pdf
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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 180-4:1982 ISO 6313:1980 Brake linings Part 4: Method for determining effects of heat on dimensions and form of disc brake pads ISO title: Road vehicles Brake linings Effects of heat on dimensions and form of disc brake pads Test procedure UDC 629.11-597.6:62
2、0.1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-4:1982 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of t
3、he Board of BSI and comes into effect on 31 March 1982 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/11 Draft for comment 78/80969 DC ISBN 0 580 12536 X National foreword This British Standard has been prepared under the direction of the Automo
4、bile Standards Committee and is identical with ISO 6313:1980 “Road vehicles Brake linings Effects of heat on dimensions and form of disc brake pads Test procedure” published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standa
5、rd has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In Britis
6、h Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-reference. At present there is no corresponding British Standard for ISO 611.
7、 However, it is intended to publish a related standard at a future date. The technical committee has reviewed the provisions of ISO 611 and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a
8、 contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4 and a back co
9、ver. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank
10、 University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-4:1982 BSI 02-2000i Contents Page National forewordInside front cover 0Introduction1 1Scope and field of application1 2Reference1 3Symbols and designations1 4Sampling and conditioning2 5Test rig2 6Test method2 7Pre
11、sentation of results4 8Test report4 Figure 1 Principal dimensions and determination of reference points1 Figure 2 Example of test rig3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: Lon
12、don South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-4:1982 BSI 02-20001 0 Introduction This International Standard describes a method for measuring dimensional changes of disc brake pads under the influence of heat. At the
13、 same time, it gives an indication of the resistance of whole disc brake pads to heat transfer in the direction of applied pressures. According to the design of the test rig, either one or two disc brake pads are required for testing. An extension of this International Standard for drum brake lining
14、s has still to be prepared. Dimensional changes and the temperatures recorded in accordance with this test method in the zone of contact of the operating forces are measured on disc brake pads whose rubbing surface is pressed against a heated plate subjected to a given temperature-time programme. 1
15、Scope and field of application This International Standard specifies a combined method of measuring disc brake pads to determine their dimensional changes in relation to temperature and their resistance to heat transfer. The dimensions concerned are: thickness dimension; certain dimensions of the li
16、ning outline when their variation may involve a misfunctioning of the brake. This International Standard applies to disc brake pads for road vehicles. Their dimensions should not exceed 80 mm in depth, 120 mm in width and 20 mm in thickness, being of integral moulded or bonded type, and the backing
17、plate of solid type. 2 Reference ISO 611, Braking of motor vehicles and their trailers Terminology. 3 Symbols and designations For general definitions, see ISO 611. SymbolDesignation dm dAi dBi %di Mean thickness of specimen pad (see clause 4) Dimensions, possibly concerned, of the lining outline (s
18、ee clause 4) Dimensions, possibly concerned, of the lining outline at ambient temperature after test (see clause 6) Changes of the possibly concerned dimensions of the lining outline (see clause 7) Figure 1 Principal dimensions and determination of reference points Licensed Copy: London South Bank U
19、niversity, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-4:1982 2 BSI 02-2000 4 Sampling and conditioning Take the samples from stock. Before placing the pads into the test rig, rub them down on both sides with emery paper (grain size No. 120)
20、 so as to remove the coat of paint from the backing plate and to render the rubbing surface itself smooth and free from unevenness. Remove any friction material from spigot holes in the backing plate to a depth sufficient to avoid influencing the test results. In the case of disc brake pads fitted w
21、ith a thin flexible anti-noise strip on the back face of the backing plate, prepare this strip in the same way as the friction material to give a good contact surface. Determine two reference points as shown in Figure 1, and measure the thickness of the disc brake pad at the reference points to an a
22、ccuracy of 0,01 mm. The mean value of these two measurements is designated dm. Measure the dimensions, if concerned, of the lining outline. These values are designated dAi. Drill a 2 mm diameter hole in the side of the lining down to one of the reference points described above. This hole shall be pa
23、rallel to the rubbing surface at a distance of 5 mm, and is used to house a sheathed thermocouple. Drill a 2 mm diameter hole in the lining backing plate parallel to and same depth as the hole described above, to house a sheathed thermocouple. In the case of disc brake pads equipped with anti-noise
24、strips, this hole is omitted. Linings exceeding the limits of 120 80 20 mm shall be reduced to this size by cutting with a parting-off disc and/or by surface grinding. 5 Test rig 5.1 The test rig is composed of a rigid, electrically heated steel plate, 80 mm high, 170 mm wide and 40 mm thick, with d
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