BRITISH STANDARD AUTOMOBILE SERIES BS AU 192 1983 ISO 7237 1981 Glossary of terms for Masses and dimensions of caravans [ISO title Road vehicles — Masses and dimensions of caravans — Terms and definit[.]
Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITISH STANDARD AUTOMOBILE SERIES Glossary of terms for Masses and dimensions of caravans [ISO title: Road vehicles — Masses and dimensions of caravans — Terms and definitions] UDC [629.11 – 43.071 + 728.76] :001.4 BS AU 192:1983 ISO 7237:1981 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 192:1983 Committees responsible for this British Standard This British Standard was published under the direction of the Automobile Standards Committee AUE/- , upon which the following bodies were represented: Amalgamated Union of Engineering Workers Auto- cycle Union Automobile Association British Rubber Manufacturers’ Association British Steel Industry Department of Industry (Mechanical Engineering) Department of the Environment (Transport and Road Research Laboratory) Department of Transport (Highways) Freight Transport Association Limited Institute of Purchasing and Supply Institution of Mechanical Engineers Institution of Production Engineers London Transport Executive Ministry of Defence Motor Cycle Association of Great Britain National Caravan Council Limited National Freight Corporation (NFC) Ltd Road Haulage Association Ltd Royal Automobile Club Society of Motor Manufacturers and Traders Limited This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI and comes into effect on Amendments issued since publication 31 October 983 © BSI 02- 2000 The following BSI references relate to the work on this standard: Committee reference AUE/Draft for comment 80/79675 DC ISBN 580 13483 Amd No Date of issue Comments Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 192:1983 Contents Page Committees responsib le National foreword ii Scope Field of application References General Masses D imensions Pub lications referred to © BSI 02 - 000 Inside front cover Inside back cover i Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92:1 983 National foreword Road vehicles — Masses and dimensions of caravans — Terms and definitions This British Standard, which has been prepared under the direction of the Automobile Standards Committee, is identical with ISO 7237: 981 “ ” prepared by Technical Committee ISO/TC 22, Road vehicles, and published by the International Organization for Standardization (ISO) Terminology and conventions The text of the International Standard 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 drawn especially to the following The comma has been used as a decimal marker In British 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-references The references in the text to ISO 1 76 are to the revised edition of ISO 1 76, currently in course of preparation The 974 edition is referred to in clause The technical committee has reviewed the provisions of ISO 61 2, ISO 1 03, ISO 1 76 and ISO 3833, referred to in the text, and has decided that they are acceptable for use in conj unction with this standard Specification for dimensional characteristics of coupling ball for caravans and light trailers A related British Standard for ISO 1 03 is BS AU 1 3a “ ” A British Standard does not 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to 6, an inside back cover and a back cover 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 ii © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 S cop e This International Standard defines terms relating to masses and dimensions of caravans It does not deal with methods of measurement, the units used in reporting the results, the accuracy required or the order of magnitude of the masses and dimensions defined Fie ld of ap p lication The provisions of this International Standard apply to caravans as defined in ISO 3833 Re fe re nce s ISO 61 2, Ro ad v ehicles — Dim ensio ns of m otor vehicles and to w ed vehicles — Term s and definitions ISO 1 03, Ro ad vehicles — Carav ans and light trailors — Co up ling b all — Dim ensio nal characteris tics ISO 1 76, Ro ad vehicles — Weights — Vocab ulary ISO 3833, Ro ad vehicles — Typ es — Term s and definitio ns Ge ne ral Unless otherwise stated, the definitions are applicable for a caravan new from the factory, in the following conditions: a) the caravan is stationary and the supporting surface is horizontal; lengths and widths are measured in the horizontal plane, and heights in the vertical plane; b) all wheels of the caravan, including the j ockey wheel, rest on the supporting surface, and its interior floor is horizontal; c) roof vents, doors, and windows are closed; retractable steps are retracted; d) the longitudinal median plane of the caravan is that defined in ISO 61 2, clause 5; e) the mass of the caravan, at the moment of measurement, is the maximum authorized total mass (see ), the load being distributed according to the manufacturer’s instructions; f) the tyres are inflated to the pressure corresponding to the maximum authorized total mass (see 5.1 4.2) of the caravan Masse s Masse s re lative to the caravan alone No 5.1 Te rm unladen mass D e finitio n The mass of the caravan fully equipped for service in accordance with manufacturer’s specification, but excluding optional extras 5.1 delivered mass The mass of the caravan including all equipment and optional extras as delivered to the first retail buyer 5.1 actual mass The mass of the caravan as loaded for a particular j ourney 5.1 5.1 4.1 maximum total mass m axim um m anufacturer’s to tal The mass calculated by the manufacturer for specific m ass operating conditions, taking into account such elements as strength of materials, tyre loading capacity, etc 5.1 4.2 m axim um autho rized total m ass The mass calculated by the administrative authority for operating conditions laid down by the authority NOTE Contrary to the footnote to term includes the static load divided by 5.1 4.3 m axim um user’s total m ass a g in ISO 1 76, this mass on the coupling ball The mass equal to the maximum authorized total mass ( ) or the authorized towed mass (see ), whichever has the smaller value a g is the standard acceleration due to gravity © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 No Te rm 5.1 payload 5.1 5.1 manufacturer’s maximum payload D e fi niti o n Product of g a and the difference between the maximum manufacturer’s total mass (5 ) and the unladen mass (5 ) 5.1 5.2 maximum authorized payload Product of g a and the difference between the maximum authorized total mass (5 ) and the unladen mass (5 ) 5.1 5.3 user’s maximum payload Product of g a and the difference between the maximum user’s total mass (5 ) and the delivered mass (5 ) 5.1 load on the left wheel (on the right wheel) The load transmitted to the supporting surface by the wheel(s) located on the left side (right side) of the caravan 5.1 maximum authorized load on the axle The difference between the product of the maximum authorized total mass (5 ) and at the coupling ball (see 5.1 static load at the coupling ball g a and the static load ) The vertical static load applied at the centre of the coupling ball cup in the coupling head of the caravan This centre is coincident with the centre of the coupling ball on the towing motor vehicle 5.1 maximum permissible static load at the coupling head, for the caravan The maximum static load, laid down by the manufacturer of the caravan, and, in countries where it is necessary, authorized by the administrative authority, that is permissible for the caravan NOTE For the maximum static load on the coupling ball for the towing motor vehicle, see a 5.2.4 g is the standard acceleration due to gravity Masse s re lative to the comb inatio n o f motor ve hicle and caravan No 5.2.1 Te rm actual combined mass D e fi ni ti o n The sum of the actual mass of the caravan (5 ) and its towing motor vehicle 5.2.2 maximum authorized actual combined mass, for a motor vehicle The sum of the maximum authorized mass of the motor vehicle (see ISO 1 76) and the mass obtained by dividing the maximum authorized load on the axle (5 ) by g a unless the administrative authority fixes a lower limit 5.2.3 5.2.3.1 5.2.3.2 5.2.4 towed mass (by a motor vehicle) manufacturer’s towed mass authorized towed mass maximum permissible static load on the coupling ball, for the towing motor vehicle See ISO 1 76 See ISO 1 76 See ISO 1 76 The maximum static load (5 ) , on the coupling ball of the motor vehicle, declared by the manufacturer of that vehicle, and which the motor vehicle is designed to support a g is the standard acceleration due to gravity © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 D ime nsions Longitudinal dime nsio ns No 6.1 Te rm overall length D e finitio n D rawi ng The distance between the two vertical planes perpendicular to the longitudinal median plane of the caravan and touching the front and rear of the caravan respectively NOTE All parts of the caravan, including any parts proj ecting from the rear, are contained within these two planes 6.1 body length The distance between two vertical planes, perpendicular to the longitudinal median plane of the caravan, and touching the front and rear parts of the body NOTE All accessories fixed on the body (for example signalling lights, handles) are contained within these two planes 6.1 wheel space In the case close coupled axles, or tandem axle, the distance between the two vertical planes passing through the centre lines of the wheels 6.1 rear overhang The distance between the vertical plane passing through the axis of the wheels and the rearmost point of any parts rigidly attached to the caravan NOTE In the case of caravans having twin axles, the axis of the rear wheels shall be taken for this purpose 6.1 drawbar length The distance between two vertical planes, perpendicular to the longitudinal median plane of the caravan, one passing through the centre of the coupling ball and the other passing through the front edge of the body bearer situated on the chassis frame © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 No 6.1 Te rm forward displacement of the centre of gravity D e fi niti o n D raw i ng The distance between the vertical plane passing through the axis of the wheels and the centre of gravity of the caravan NO TE In the case of twin axles, the vertical plane equidistant from the two axles shall be taken for this purpose Transve rse d ime nsions No 6.2 Te rm overall width D e finitio n D raw i ng The distance between the two vertical planes parallel to the longitudinal median plane of the caravan and touching the caravan on b oth sides of this plane 6.2 track The distance between: a) in the case of two single wheels corresponding to the same real or imaginary axle, the two straight lines formed by the axes of the traces left by the wheels on the supporting surface; b ) in the case of twin wheels, the straight lines, on each side of the caravan, equidistant from the outer edge of the trace of the inner wheel and from the inner edge of the trace of the outer wheel 6.2 lateral displacement of the centre of gravity The distance between the centre of gravity and the longitudinal median plane of the caravan © BSI 02 - 000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 Ve rtical d ime nsions No 6.3 Te rm overall height D e finitio n D rawi ng The distance between the supporting surface and a horizontal plane touching the uppermost part of the caravan NOTE Contrary to clause e), this dimension shall be measured when the mass of the caravan is the unladen mass ( ) 5.1 6.3 6.3 height of coupling head The distance between the supporting surface and the centre of the coupling head height of centre of gravity The distance between the centre of gravity and the supporting surface, determined according to the loading conditions specified in The distance between the ground and the lowest point of the centre part of the vehicle The centre part is that part contained between two planes parallel to and equidistant from the longitudinal median plane (of the vehicle) [see clause d)] and separated by a distance which is 80 % of the least distance between points on the inner edges of the wheels on any one axle The distance from the supporting surface to the upper surface of the floor 5.1 6.3 ground clearance 6.3 height to floor © BSI 02-2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 92 : 983 Angle s No 6.4.1 Te rm departure angle D e fi niti o n D raw i ng The greatest angle between the horizontal plane and planes tangential to the static loaded wheel tyres (behind the axle) , such that no point of the caravan behind the axle and no part rigidly attached to the caravan lies below these planes NOTE In the case of twin axles, the rearmost wheels shall be taken for this purpose 6.4.2 ramp angle for the combination of motor vehicle and caravan The supplement of the smallest dihedral angle over which the combination of motor vehicle and caravan can cross without fouling the ridge, the ball distance from the ground being in the height range specified in ISO 1 03 6.4.3 manoeuvring angle for the combination of motor vehicle and caravan The angle between the longitudinal median plane of the caravan and the longitudinal median plane of the motor vehicle when the motor vehicle draws or pushes the caravan 6.4.4 limit of reversing angle for the combination of motor vehicle and caravan The maximum value of the manoeuvring angle (6 ), in the reversing gear, that the driver may increase or decrease NOTE When the manoeuvring angle is above this value, the driver is unable to control the reversing manoeuvre 6.4.5 angle of contact of the combination of motor vehicle and caravan The maximum manoeuvring angle (6 ) at which the motor vehicle contacts the caravan © BSI 02- 2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Fri Dec 08 6: 57: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI Publications referred to See national foreword © BSI 02 - 000 BS AU 192:1983 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th 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