1、BRITISH STANDARD AUTOMOBILE SERIES CONFIRMED APRIL1991 BSAU 190:1983 Specification for Interface dimensions and fixing bolts for the mounting of overrun devices on delta shaped drawbars of trailers upto2000kg UDC629.1.013.5:629.11-43BSAU190:1983 This BritishStandard, having been prepared under the d
2、irectionof the Automobile Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 30September1983 BSI02-2000 The following BSI references relate to the work on this standard: Committee referenceAUE/8 Draft for comment82/76439DC ISBN 0 580 13399 0 Committees r
3、esponsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Automobile Standards Committee (AUE/-) to Technical Committee AUE/8 upon which the following bodies were represented: Association of Trailer Manufacturers Caravan Club Chief and Assistant Chief Fire Offi
4、cers Association Department of Industry (Mechanical Engineering) Department of Transport National Caravan Council Limited Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date of issue CommentsBSAU190:1983 BSI 02-2000 i Contents Page Committees responsi
5、ble Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Mounting dimensions 1 4 Fixing bolts and nuts 1 Figure 1 Positions of mounting holes in delta shaped drawbar 1 Publications referred to Inside back coverBSAU190:1983 ii BSI 02-2000 Foreword This BritishStandard has been prepared under th
6、e direction of the Automobile Standards Committee. It is intended to ensure interchangeability of overrun devices when they are mounted on delta shaped drawbars of trailers. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are resp
7、onsible 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, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has bee
8、n updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSAU190:1983 BSI 02-2000 1 1 Scope This BritishStandard specifies requirements forinterface dimensions and fixing bolts for themounting of overrun devices
9、on delta shapeddrawbars of trailers up to a gross mass of2000kg. NOTEThe titles of the publications referred to in this standardare listed on the inside back cover. 2 Definitions For the purposes of this BritishStandard, the following definitions apply. 2.1 delta shaped drawbar twin drawbars of a tr
10、ailer whose included angle, where they join, is approximately30 . 2.2 overrun device a device that automatically applies the brakes of a trailer when the speed of the towing vehicle decreases. 3 Mounting dimensions The sizes and disposition of mounting holes shall be as shown in Figure 1. NOTEOverru
11、n devices are provided with slots to accommodate the two rear fixing bolts, the position of which may vary within the tolerance on the angle shown in Figure 1. 4 Fixing bolts and nuts Four1/2UNI gradeS bolts and nuts complying with BS1768, or four12mm grade8.8 bolts and nuts complying with BS3692, s
12、hall be used to secure the overrun device to the mounting face of the drawbar. The nuts shall be secured by a locking method that will prevent them becoming loose. Figure 1 Positions of mounting holes in delta shaped drawbar2 blankBSAU190:1983 BSI 02-2000 Publications referred to BS1768, Unified pre
13、cision hexagon bolts, screws and nuts (UNC and UNF threads). Normal series. BS3692, ISO metric precision hexagon bolts, screws and nuts. BSAU 190:1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandar
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