Road vehicles — Trailers up to 3,5 t — Requirements for jockey wheels and drawbar supports

ISO 13052:2013 is intended to define safety requirements which apply to jockey wheels and drawbar supports provided to support the single axle (centre axle) rigid drawbar trailers nose weight with a technically permissible maximum laden mass not more than 3,5 tons.

Véhicules routiers — Remorques jusqu'à 3,5 t — Exigences pour roues jockey et supports de barres d'attelage

General Information

Status
Published
Publication Date
24-Oct-2013
Current Stage
9060 - Close of review
Start Date
05-Mar-2019
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ISO 13052:2013 - Road vehicles -- Trailers up to 3,5 t -- Requirements for jockey wheels and drawbar supports
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INTERNATIONAL ISO
STANDARD 13052
First edition
2013-11-01
Road vehicles — Trailers up to 3,5 t —
Requirements for jockey wheels and
drawbar supports
Véhicules routiers — Remorques jusqu’à 3,5 t — Exigences pour roues
jockey et supports de barres d’attelage
Reference number
ISO 13052:2013(E)
ISO 2013
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ISO 13052:2013(E)
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© ISO 2013

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ii © ISO 2013 – All rights reserved
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ISO 13052:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

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For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 4, Exterior

fittings of car/trailer-caravan combinations.
© ISO 2013 – All rights reserved iii
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INTERNATIONAL STANDARD ISO 13052:2013(E)
Road vehicles — Trailers up to 3,5 t — Requirements for
jockey wheels and drawbar supports
1 Scope

This International Standard is intended to define safety requirements which apply to jockey wheels and

drawbar supports provided to support the single axle (centre axle) rigid drawbar trailers nose weight

with a technically permissible maximum laden mass not more than 3,5 tons.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
jockey wheel

device usually mounted on the front of the trailer to support the nose weight of the trailer and to adjust

the height of the drawbar if not connected

Note 1 to entry: This device permits the movement of the trailer in any direction at steady-state without the use

of a towing road vehicle.
2.2
drawbar support device

device fastened to the drawbar with height-adjustable mechanism, retaining the trailer in horizontal

position when being disconnected to the towing vehicle

Note 1 to entry: Built up with a vertical tubular strut and adjustable height provided with a blocking system

and/or clamping system activated by handle operation.

Note 2 to entry: When this device is equipped with a lift system, uncoupling the axle of the coupling ball to the

coupling ball shall be permitted.
2.3
nose mass

mass on the coupling point which is needed to hold the trailer in horizontal position

Note 1 to entry: The S value is the vertical mass, in kilograms, imposed on the coupling, under static conditions,

by the centre axle trailer, as defined in ECE R55–01 paragraph 2.13, of technically permissible maximum mass.

2.4
vertical static load

vertical load applied to the coupling device of the towing vehicle expressed in Newton

2.5
nose weight

load holding up the drawbar support device when the trailer is uncoupled, with value depending on ratio

of the trailer coupling point distance on its axle expressed in Newton
2.6
lifting force
reacting force on the ground from the nose weight expressed in Newton
2.7
strut

adjustable tubular equipment holding up the nose weight, telescopic or not, fitted with a wheel or not

© ISO 2013 – All rights reserved 1
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ISO 13052:2013(E)
2.8
clamping system

device used to block the strut by a clamping ring and an operation handle or by a clamping set screw

Note 1 to entry: In these two cases, device shall insure blocking of the strut which supports the nose weight in

order to stabilize the uncoupled trailer in horizontal position.
2.9
coupling head

mechanical part fitted to the drawbar of trailers for connecting to the 50 mm diameter coupling ball on

the towing vehicle defined in ECE R55 article 2.6.2
2.10
drawbar eyes

mechanical part having a parallel hole suitable for a 50 mm diameter pin and fitted to the drawbar of

trailers for connecting to automatic drawbar couplings defined in ECE R55 article 2.6.4

2.11
load lifting capacity

maximum vertical mass, in kg, given by the manufacturer of the jockey wheel or the drawbar support

device which can be lifted
3 Jockey wheels – requirements
3.1 Markings

Each jockey wheel and drawbar support shall be permanently and clearly legibly marked with the

following information on a component that cannot be lost unintentionally and that cannot be removed

without tool:
— manufacturer’s identification;
— load lifting capacity.
3.2 Testing

The drawbar support device strength shall be tested by applying a load equal to two times the permissible

static vertical load value at the coupling head of the trailer as described in Formula (1):

Test load = 2 × permitted load lifting capacity
(1)
3.2.1 Calculation of the lifting force

The drawbar support device strength shall be tested by applying a load equal to two time

...

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