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1、BRITISH STANDARD BS AU 239:1991 ISO 8718:1988 Method of testing Strength of drawbar couplings and eyes for hinged drawbars Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 This British Standard, h
2、aving been prepared under the direction of the Automobile Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30 April 1991 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/13 Draft for com
3、ment 85/76410 DC ISBN 0 580 19411 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/-) to Technical Committee AUE/13, upon which the following bodies were represented: British Railways Board Bus
4、 and Coach Council Department of Transport Freight Transport Association Health and Safety Executive Institute of Road Transport Engineers (Incorporated) London Regional Transport Ministry of Defence Road Haulage Association Ltd. Society of Motor Manufacturers and Traders Limited Amendments issued s
5、ince publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 BSI 02-2000i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative re
6、ferences1 3General test requirements1 4Determination of F rating1 5Test conditions1 6Strength criteria1 Figure 1 Application of horizontal test load Ft2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:0
7、0 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 ii BSI 02-2000 National foreword This British Standard has been prepared under the direction of the Automobile Standards Policy Committee and is identical with ISO 8718:1988 “Commercial road vehicles Drawbar couplings and eyes for hinged drawbars Str
8、ength test” published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 1176, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not
9、purport to include all the necessary provisions of a 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. Cross-references International StandardCorresponding British Standard
10、 ISO 1102:1986BS AU 220:1988 Specification for dimensions of 50 mm drawbar couplings between commercial road vehicles and trailers (Identical) ISO 3584:1975BS AU 166:1977 Specification for road vehicles mounting of mechanical coupling devices on rear cross members of trucks (Identical) ISO 8755:1986
11、BS AU 219:1988 Specification for dimensions of 40 mm drawbar couplings between commercial road vehicles and trailers (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been
12、 updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 BS
13、I 02-20001 1 Scope This International Standard lays down test conditions and strength requirements to be met by 40 mm and 50 mm drawbar couplings, and the corresponding drawbar eyes for hinged drawbars. 2 Normative references The following standards contain provisions which, through reference in thi
14、s text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
15、 editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1102:1986, Commercial road vehicles Mechanical connections between towing vehicles and trailers 50 mm drawbar couplings. ISO 1176, Road vehicles Masses Vocabulary and co
16、des1). ISO 3584:1975, Road vehicles Mounting of mechanical coupling devices on rear cross members of trucks. ISO 8755:1986, Commercial road vehicles Mechanical connections between towing vehicles and trailers 40 mm drawbar couplings. 3 General test requirements 3.1 The test shall be carried out with
17、 drawbar couplings and drawbar eyes having functional dimensions as given in ISO 1102 or ISO 8755. 3.2 The strength tests described in this International Standard are dynamic tests to be performed on a test bed. 3.3 The fixing arrangements for the drawbar coupling on the test bed shall be those inte
18、nded for its attachment to the towing vehicle in accordance with the coupling manufacturers fitting instructions. 3.4 Drawbar couplings and drawbar eyes shall be tested separately. 3.5 At the discretion of the manufacturer, any flexible components may be neutralized. 4 Determination of F rating The
19、horizontal load F shall be taken as a basis for the assumed loads given below. This is a comparative value determined by calculation for the longitudinal forces occurring between towing vehicle and trailer. The F value, expressed in kilonewtons, shall be calculated with the equation: where m1is the
20、maximum design total mass of the towing vehicle to which the drawbar coupling is to be attached, in tonnes; m2is the maximum design total mass of the trailer which is to be drawn with the drawbar coupling, in tonnes; gnis the acceleration due to gravity: gn= 9,806 65 m/s2 Terminology used for the di
21、fferent masses shall be taken with the meanings given in the corresponding definitions in the revision of ISO 1176:1974. 5 Test conditions 5.1 Application of test load 5.1.1 The horizontal test load Ft simulating practical loads under driving conditions shall be applied. 5.1.2 The horizontal test lo
22、ad Ft shall be an alternating force (see Figure 1) and shall alternate between + 0,6 F and 0,6 F. Ft may be applied by means of a special slack-free trailer coupling ring. 5.2 Loading cycle The dynamic test shall be carried out sinusoidally and the number of cycles shall be 2 106. 5.3 Frequency The
23、selected frequency shall not exceed 30 Hz, and shall not coincide with the natural frequency of the system. 6 Strength criteria The dynamic test in 5.1 shall not cause permanent deformation, breaks or cracks. 1) Second edition to be published (revision of ISO 1176:1974). Fgn m1m2 m1m2+ - -= Licensed
24、 Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 2 BSI 02-2000 Figure 1 Application of horizontal test load Ft Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:0
25、7 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 BSI 02-2000 Publication(s) referred to See national foreword. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:07:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 239:1991 ISO 8718:1988 BSI 389 Chi
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