1、BSI Standards PublicationBS ISO 5721-2:2014Agricultural tractors Requirements, test proceduresand acceptance criteria for theoperators field of visionPart 2: Field of vision to the side and to therearBS ISO 5721-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation o
2、f ISO 5721-2:2014.Together with BS ISO 5721-1:2013, it supersedes BS ISO 5721:1989,which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AGE/6, Agricultural tractors and forestry machinery.A list of organizations represented on this committee can beobtained o
3、n request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 73556 1ICS 65.060.10Compliance with a Brit
4、ish Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since publicationDate Text affectedBS ISO 5721-2:2014 ISO 2014Agricultural tractors Requirements, test
5、 procedures and acceptance criteria for the operators field of vision Part 2: Field of vision to the side and to the rearTracteurs agricoles Exigences, modes opratoires dessai et critres dacceptation relatifs au champ de visibilit du conducteur Partie 2: Champ de visibilit latral et vers larrireINTE
6、RNATIONAL STANDARDISO5721-2First edition2014-02-01Reference numberISO 5721-2:2014(E)BS ISO 5721-2:2014ISO 5721-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized other
7、wise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCa
8、se postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 5721-2:2014ISO 5721-2:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 General
9、 provisions for testing 14.1 General . 14.2 Measurement accuracy 14.3 Eye position . 15 Requirements, test procedures, and acceptance criteria. 25.1 Requirements . 25.2 Test procedures 35.3 Acceptance criteria 4BS ISO 5721-2:2014ISO 5721-2:2014(E)ForewordISO (the International Organization for Stand
10、ardization) 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
11、to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures us
12、ed 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
13、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 identifi
14、ed 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 constitute an endorsement.For an explanation on
15、the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO
16、/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 4, Tractors.This first edition of ISO 5721-2, together with ISO 5721-1, cancels and replaces the second edition of ISO 5721 (ISO 5721:1989), which has been technically revised.ISO 5721 consists of the following parts, under
17、 the general title Agricultural tractors Requirements, test procedures and acceptance criteria for the operators field of vision: Part 1: Field of vision to the front Part 2: Field of vision to the side and to the reariv ISO 2014 All rights reservedBS ISO 5721-2:2014INTERNATIONAL STANDARD ISO 5721-2
18、:2014(E)Agricultural tractors Requirements, test procedures and acceptance criteria for the operators field of vision Part 2: Field of vision to the side and to the rear1 ScopeThis part of ISO 5721 specifies the requirements, test procedures, and acceptance criteria for the field of vision to the si
19、de and the rear of the operator of agricultural tractors.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest
20、 edition of the referenced document (including any amendments) applies.ISO 5006:2006, Earth-moving machinery Operators field of view Test method and performance criteriaISO 5721-1:2013, Agricultural tractors Requirements, test procedures and acceptance criteria for the operators field of vision Part
21、 1: Field of vision to the frontUNECE R 46, Uniform provisions concerning the approval of devices for indirect vision and of motor vehicles with regard to the installation of these devices (including amendment 1)3 Terms and definitionsFor the purpose of this document, the terms and definitions of IS
22、O 5721-1 apply.4 General provisions for testing4.1 GeneralThe fields of vision as described in 5.1 shall be viewed either directly from the operators seat or by means for the indirect view. In this last case, the lateral and rear visibility shall be checked for a single setting.4.2 Measurement accur
23、acySee 4.1 of ISO 5721-1:2013.4.3 Eye positionSee 4.2 of ISO 5721-1:2013. ISO 2014 All rights reserved 1BS ISO 5721-2:2014ISO 5721-2:2014(E)5 Requirements, test procedures, and acceptance criteria5.1 Requirements5.1.1 GeneralThe tractor shall be constructed and equipped in such a way that, in road t
24、raffic and in farm use, the operator has an adequate field of vision, under all the usual conditions pertaining to highway use and to work undertaken in fields and at track width appropriate for the overall width of single tires not to exceed 2,55 m.Mirrors and other means for indirect view shall be
25、 attached in such a way that their movements and vibrations do not cause noticeable change of the measured field of view so as to minimize possibility of misinterpretation of the view by the operator. This requirement shall be fulfilled with speeds up to 80 % of the maximum design speed.5.1.2 Field
26、of vision laterally behind the vehicleThe field of vision shall be such that the operator can see on both sides at least a 5 m wide, flat, horizontal portion at a height of 1 m above the road, which is bounded by a plane parallel to the median longitudinal vertical plane of the vehicle and passing t
27、hrough the outermost point of the vehicle and which extends from 30 m behind the operators eye position to the horizon.In addition, the portion 1 m above the road shall be visible to the operator over a width of 1 m, which is bounded by a plane parallel to the median longitudinal vertical plane and
28、passing through the outermost point of the vehicle starting from a point 4 m behind the vertical plane passing through the operators eye position (see Figure 1).Dimensions in metresKey1 eye position2 field of vision laterally behind the tractorFigure 1 Field of vision laterally behind the vehicle5.1
29、.3 Field of vision beside the vehicleThe field of vision shall be such that the operator can see at least a flat horizontal portion at a height of 1 m above the road, which is bounded by (see Figure 2): the plane parallel to the median longitudinal vertical plane of the vehicle which passes 0,5 m fr
30、om the outermost point of the width of the vehicle,2 ISO 2014 All rights reservedBS ISO 5721-2:2014ISO 5721-2:2014(E) the plane parallel to the median longitudinal vertical plane of the vehicle which passes 2 m from the outermost point of the width of the vehicle, to the rear, the plane parallel to
31、the vertical plane passing through the operators eye position and situated at a distance of 1,75 m behind that plane, and to the front, the plane parallel to the vertical plane passing through the operators eye position and situated at a distance of 1 m in front of that plane. If the vertical transv
32、erse plane passing through the forwardmost point of the tractor chassis or grill screen is less than 1 m in front of the vertical plane passing through the operators eye position, the field of vision shall be limited to that plane.Dimensions in metresKey1 eye positionFigure 2 Field of vision beside
33、the vehicle in 1 m height above the ground5.1.4 Equivalent requirementsThe requirements of ISO 5006:2006 for the evaluation of the indirect view of earth-moving machines are considered equivalent.The technical requirements of the UNECE Regulation No. 46 revision 4 including amendment 1 are considere
34、d equivalent.5.2 Test procedures5.2.1 Evaluation, whether additional means for indirect view beside the vehicle are necessaryThe tractor shall be placed on a horizontal surface. On a horizontal support level with the reference point, there shall be mounted two point sources of light, 65 mm apart and
35、 symmetrically located with respect to the reference point. The support shall be rotatable at its centre point about a vertical axis passing through the reference point. For the purpose of measuring the masking effects, the support shall be so aligned that when simultaneous or alternate switching on
36、 of both sources of light, the silhouette (deepest shadow) is determined as the masking effect at 1 m height within the specified fields of vision. Shifting of the eye position shall be permissible around 170 mm to both sides. For the verification, e.g. a mirror at 1 m height shall be carried across
37、 the entire specified field of vision. The mirror shall be oriented to the light sources such that these can be detected.5.2.2 Determination of the field of visionThe field of vision shall be determined by placing powerful light sources at the eye position and measuring the light reflected. ISO 2014
38、 All rights reserved 3BS ISO 5721-2:2014ISO 5721-2:2014(E)For closed-circuit television systems (CCTV), the test procedures of the UNECE Regulation No. 46 revision 4 including amendment 1 apply.5.2.3 Equivalent test proceduresOther equivalent test procedures are permitted.The test procedures accordi
39、ng to ISO 5006:2006 for the evaluation of the indirect view of earth-moving machines are considered equivalent.The test procedures according to the UNECE Regulation No. 46 revision 4 including amendment 1 are considered equivalent.5.3 Acceptance criteria5.3.1 Direct viewWhen testing according to 5.2
40、.1, no deepest shadow (umbra) shall remain as the masking effect at 1 m height within the specified fields of vision.The specified field of vision according to 5.1.3 shall be deemed to be sufficient if masking effects caused by obstructions cover not more than 10 % of the specified field of vision o
41、n each side of the vehicle and a test specimen of 300 mm does not entirely disappear in one masking within the whole specified field of vision.If these criteria are not met, means for indirect view are necessary.5.3.2 Indirect viewIn the specified fields of vision, obstruction due to the bodywork an
42、d some of its components, such as other mirrors, door handles, outline marker lights, direction indicators, etc., as well as reflective-surface cleaning components, shall not be taken into account if they are responsible for a total obstruction of less than 10 % of the specified field of vision.Obst
43、ructions of the specified fields of vision according to 5.1.3 shall not be permitted.4 ISO 2014 All rights reservedBS ISO 5721-2:2014BS ISO 5721-2:2014ISO 5721-2:2014(E) ISO 2014 All rights reservedICS 65.060.10Price based on 4 pagesThis page deliberately left blankBSI is the national body responsib
44、le for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)BSI Group Headquarters389 Chiswic
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