1、BRITISH STANDARD AUTOMOBILE SERIES BS AU29:1964 (Supersedes S.M.M.T. Standard No.53) Specification for Drawbar eyes and forecarriage pins for connection between trailers of5-35 tons gross weight and towing vehicle UDC 629.11.013.5:629.11.013.8BSAU29:1964 This BritishStandard, having been approved by
2、 the AutomobileIndustry Standards Committee and endorsed by theChairman of the Engineering Divisional Council, was publishedunder the authority ofthe General Council of theInstitution on 15June1964 BSI 02-2000 The following BSI reference relates to the work on this standard: Committee reference AUE/
3、- ISBN 0 580 34552 1 Amendments issued since publication Amd. No. Date CommentsBSAU29:1964 BSI 02-2000 i Contents Page Foreword ii 1 Scope 1 2 Materials 1 3 Dimensions 1 4 Design 1 Figure 1 Fixed drawbar eye and forecarriage pins 1 Figure 2 Alternative swivelling eye 1BSAU 29:1964 ii BSI 02-2000 For
4、eword This BritishStandard which is published under the authority of the Automobile Industry Standards Committee of the BSI, is based upon data sheet SMMT53:1957 of the Society of Motor Manufacturers and Traders Ltd. The requirements of this standard, which relate only to vehicles used on the public
5、 highways, are intended to ensure the maximum degree of interchangeability between commercial and Government department and Services standards. The material specifications are for the minimum qualities acceptable, and do not exclude the use of other materials provided that these are at least equal i
6、n quality so that road safety is not impaired. This standard should be used in conjunction with the following BritishStandards: a) for towing hooks BS AU25 1)and BS AU27 2) b) for towing jaws BS AU 26 3)and BS AU28 4) The standard applies to connections to trailers not exceeding14 and35 tons gross w
7、eight. The specification for drawbar eyes and forecarriage pins for connections to trailers of25 tons gross weight is given in BS AU24 5) . NOTEIf it is required to convert the figures in this standard from British units into metric units it is recommended that the conversion factors and tables cont
8、ained in BS350, “Conversion factors and tables”, be used. Attention is also drawn to BS2856, “Precise conversion of inch and metric sizes on engineering drawings”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible fo
9、r 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, pagesi andii, pages1 and2 and a back cover. This standard has been updated (see copyright date) an
10、d may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) BS AU25, “Towing hook for use between trailers of514 tons gross weight and towing vehicle”. 2) BS AU 27, “Towing hook for use between trailers of535 tons gross weight and towing vehicl
11、e”. 3) BS AU26, “Towing jaw for use between trailers of514 tons gross weight and towing vehicle”. 4) BS AU28, “Towing jaw for use between trailers of535 tons gross weight and towing vehicle”. 5) BS AU24, “Towing connections for trailers of25 tons gross weight”.BSAU29:1964 BSI 02-2000 1 1 Scope This
12、BritishStandard specifies the basic dimensions and quality of materials for drawbar eyes and forecarriage pins for use in connections between towing vehicles and: a) trailers not exceeding14 tons gross weight b) trailers not exceeding35 tons gross weight The gross weights refer to gross laden train
13、weights where more than one trailer is drawn. 2 Materials The quality of the materials used in construction shall be at least equal to the following: a) Drawbar eyes i) Trailers not exceeding14 tons gross weight: BS51 6) , wrought iron, Grade A, or BS970 7) , En3A. ii) Trailers not exceeding35 tons
14、gross weight: BS970 7) , En3A. b) Forecarriage pins BS 970 7) , En3A. 3 Dimensions Dimensions shall be as shown in the Table and Figure 1. NOTEThe dimensions specified are calculated on the basis of the total yield strength of the parts of the drawbar being equal to two thirds of the gross weight be
15、ing towed. It is necessary that any other parts connecting the trailer to the towing vehicle not covered this standard, shall be at least equal in strength. 4 Design a) Effective means shall be provided to prevent endwise movement of the forecarriage pin. b) If the drawbar eye is arranged to swivel,
16、 stops should be provided limiting the angular movement to15 either side of the horizontal (seeFigure 2). 6) BS 51, “Wrought iron for general engineering purposes (Grades A, B, C and D)”. 7) BS 970, “Wrought steels in the form of bars, billets, and forgings, up to6in ruling section, for automobile a
17、nd general engineering purposes. En series”. Figure 1 Fixed drawbar eye and forecarriage pins Figure 2 Alternative swivelling eyeBSAU29:1964 2 BSI 02-2000 TRAILER gross weight maximum a DRAWBAR EYE FORE CARRIAGE PIN inside diameter A diameter of section B diameter P (in double shear) minimum tons in
18、 in in 14 2 1; 1 14 3 1C 1 35 3 1C 1; a The trailer gross weight indicated in the first column is the maximum towed weight, whether consisting of one or more trailers. Care should be taken to ensure that the combined gross weight of the trailers towed by any particular drawbar eye or forecarriage pi
19、n does not exceed the gross weight for which the drawbar eye or forecarriage pin is designed.blankBS AU 29:1964 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standard
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