1、Earth-mover tyres and rimsPart 2: Loads and inflation pressuresBS ISO 42502:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Earth-mover tyres and rims Part 2: Loads and inflation pressuresPneumatiques et jantes pour engins de terrassement Partie 2: Charg
2、es et pressions de gonflageINTERNATIONAL STANDARDISO4250-2Sixth edition2017-08Reference numberISO 4250-2:2017(E)National forewordThis British Standard is the UK implementation of ISO 42502:2017. It supersedes BS ISO 42502:2014, which is withdrawn.The UK participation in its preparation was entrusted
3、 to Technical Committee AUE/4, Tyres and wheels for motor vehicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicat
4、ion. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 94572 4ICS 53.100; 83.160.99Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy
5、Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 42502:2017 ISO 2017Earth-mover tyres and rims Part 2: Loads and inflation pressuresPneumatiques et jantes pour engins de terrassement Partie 2: Charges et pressions de gonflageINTERN
6、ATIONAL STANDARDISO4250-2Sixth edition2017-08Reference numberISO 4250-2:2017(E)BS ISO 42502:2017ISO 4250-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduc
7、ed or utilized otherwise 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.IS
8、O copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 42502:2017ISO 4250-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Un
9、less otherwise specified, no part of this publication may be reproduced or utilized otherwise 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
10、 address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 4250-2:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definit
11、ions . 14 Special conditions . 35 Selection of tyres for new machine design 36 Inflation pressures . 47 Load/inflation tables . 48 Load capacities for earth-mover tyres on industrial vehicles . 4Bibliography .26 ISO 2017 All rights reserved iiiContents PageBS ISO 42502:2017ISO 4250-2:2017(E)Foreword
12、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
13、committee has been established has the right 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 elect
14、rotechnical 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 dr
15、afted 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 paten
16、t 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
17、 constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT
18、) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 6, Off-the-road tyres and rims.This sixth edition cancels and replaces the fifth edition (ISO 4250-2:2014), which has been technically revi
19、sed.A list of all parts in the ISO 4250 series can be found on the ISO website.iv ISO 2017 All rights reservedBS ISO 42502:2017ISO 4250-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pr
20、eparing 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 organizations, governmental and non-governmental, i
21、n 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 used to develop this document and those intended for its further maintenance are described in the ISO/IE
22、C 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 possibilit
23、y 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 pate
24、nt 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 the voluntary nature of standards, the meaning of ISO specific terms and expressions related to co
25、nformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Su
26、bcommittee SC 6, Off-the-road tyres and rims.This sixth edition cancels and replaces the fifth edition (ISO 4250-2:2014), which has been technically revised.A list of all parts in the ISO 4250 series can be found on the ISO website.iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 4250-2:20
27、17(E)Earth-mover tyres and rims Part 2: Loads and inflation pressures1 ScopeThe ISO 4250 series consists of three parts laying down the technical designation and dimensions of tyres and rims for earth-movers; it also gives load tables for these tyres.This document gives working definitions of masses
28、 and load cycles and specifies tyre loads and reference inflation pressures for narrow- and wide-base tyres primarily intended for earth-mover machines.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements o
29、f this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4223-1, Definitions of some terms used in the tyre industry Part 1: Pneumatic tyres3 Terms and definitionsFor the purpos
30、es of this document, the terms and definitions given in ISO 4223-1 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at
31、 h t t p :/ www .iso .org/ obpNOTE For a list of equivalent terms for tyres, valves and tubes, see ISO 3877-1.3.1 Definitions of masses3.1.1maximum loadload of individual tyres determined by the manufacturers rated gross machine mass (GMM) distribution assigned to each axle, divided by the number of
32、 tyres for that axleNote 1 to entry: The maximum GMM includes masses calculated in 3.1.1.1 to 3.1.1.5 inclusive.Note 2 to entry: If tyre ballast is used, this is also included in the determination of GMM.3.1.1.1operating massnet weightactual mass of the base machine with equipment specified by the m
33、anufacturer, operator (75 kg), full fuel tank and full lubricating, hydraulic and cooling systems ISO 2017 All rights reserved 1BS ISO 42502:2017ISO 4250-2:2017(E)3.1.1.2optional equipment massdifference in operating mass (3.1.1.1) between the optional item and standard item replacedEXAMPLE Engine,
34、brakes, tyres, etc.Note 1 to entry: This includes the operating mass of additional items offered by the manufacturer which are not replacements for standard items (such as cabs, body-liners, sideboards, air-conditioners, etc.)3.1.1.3mass of special modificationsdifference in the operating mass (3.1.
35、1.1) of the machine due to modifications not previously covered in optional equipment mass (3.1.1.2) that includes additional reinforcements, etc.3.1.1.4payloadtotal mass of the material being carried3.1.1.5field modificationoperating mass change due to machine alterations made other than by the ori
36、ginal manufacturerEXAMPLE Modifications for additional capacity, reinforcements, etc.3.2 Definitions of operating conditions3.2.1maximum speedpeak velocity attained by the machine3.2.2earth-moving haulage cyclecycle where a machine self-loads or receives a load from loading equipment, transports it
37、elsewhere and returns unloadedNote 1 to entry: Transportation usually occurs over unimproved surfaces at medium speeds, up to 65 km/h and short distances, up to 4 km one way.Note 2 to entry: Machines in this category are mainly haulage trucks (dumpers) and tractor-scrapers.3.2.3loader cyclecycle whe
38、re the machine is used to pick up material and move it a short distance awayNote 1 to entry: Tyre loads fluctuate depending on the conditions involved when the equipment picks up the load.Note 2 to entry: Transportation speeds are low, up to 10 km/h and distances are short, usually less than 75 m on
39、e way.3.2.4load-carry cyclecycle where the machine, primarily intended for loader service, picks up a load, transports it elsewhere and returns unloadedNote 1 to entry: Transportation usually occurs over unimproved surfaces at low speeds, up to 25 km/h, and short distances, up to 600 m.Note 2 to ent
40、ry: Machines in this category consist mainly of wheel loaders, log stackers and material-handling equipment.Note 3 to entry: Tyre manufacturers should be consulted for specific conditions.2 ISO 2017 All rights reservedBS ISO 42502:2017ISO 4250-2:2017(E)3.1.1.2optional equipment massdifference in ope
41、rating mass (3.1.1.1) between the optional item and standard item replacedEXAMPLE Engine, brakes, tyres, etc.Note 1 to entry: This includes the operating mass of additional items offered by the manufacturer which are not replacements for standard items (such as cabs, body-liners, sideboards, air-con
42、ditioners, etc.)3.1.1.3mass of special modificationsdifference in the operating mass (3.1.1.1) of the machine due to modifications not previously covered in optional equipment mass (3.1.1.2) that includes additional reinforcements, etc.3.1.1.4payloadtotal mass of the material being carried3.1.1.5fie
43、ld modificationoperating mass change due to machine alterations made other than by the original manufacturerEXAMPLE Modifications for additional capacity, reinforcements, etc.3.2 Definitions of operating conditions3.2.1maximum speedpeak velocity attained by the machine3.2.2earth-moving haulage cycle
44、cycle where a machine self-loads or receives a load from loading equipment, transports it elsewhere and returns unloadedNote 1 to entry: Transportation usually occurs over unimproved surfaces at medium speeds, up to 65 km/h and short distances, up to 4 km one way.Note 2 to entry: Machines in this ca
45、tegory are mainly haulage trucks (dumpers) and tractor-scrapers.3.2.3loader cyclecycle where the machine is used to pick up material and move it a short distance awayNote 1 to entry: Tyre loads fluctuate depending on the conditions involved when the equipment picks up the load.Note 2 to entry: Trans
46、portation speeds are low, up to 10 km/h and distances are short, usually less than 75 m one way.3.2.4load-carry cyclecycle where the machine, primarily intended for loader service, picks up a load, transports it elsewhere and returns unloadedNote 1 to entry: Transportation usually occurs over unimpr
47、oved surfaces at low speeds, up to 25 km/h, and short distances, up to 600 m.Note 2 to entry: Machines in this category consist mainly of wheel loaders, log stackers and material-handling equipment.Note 3 to entry: Tyre manufacturers should be consulted for specific conditions.2 ISO 2017 All rights
48、reserved ISO 4250-2:2017(E)3.2.5dozer cyclecondition where a machine is used to move materials (usually earth) by pushing, dragging or gradingNote 1 to entry: Tyre loads are relatively constant and speeds are low, up to 10 km/h.Note 2 to entry: Travel distances vary depending on work situations.3.2.
49、6grader cyclecondition where a machine is used in construction and road maintenanceNote 1 to entry: Tyre loads are relatively constant during work cycles.Note 2 to entry: Grader speeds are slower during working periods, with typical transportation speeds reaching about 40 km/h.Note 3 to entry: Travel distances vary depending on the work situations.3.2.7creepmovement of equipment at a very low speedNote 1 to entry: Speed is commonly not over 120 m in 60 min.Note 2 to entry: During creep motion, loads on the tyres are usually
