1、 ISO 2014Earth-mover tyres and rims Part 2: Loads and inflation pressuresPneumatiques et jantes pour engins de terrassement Partie 2: Charges et pressions de gonflageINTERNATIONAL STANDARDISO4250-2Fifth edition2014-06-01Reference numberISO 4250-2:2014(E)ISO 4250-2:2014(E)ii ISO 2014 All rights reser
2、vedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless 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
3、 permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandISO 4250-2:2
4、014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 13.1 Definitions of masses . 13.2 Definitions of operating conditions 23.3 Definition of vehicle type . 34 Special conditions . 35 Selection of tyres for new machine design 36
5、Inflation pressures General . 37 Load/inflation tables . 48 Load capacities for earth-mover tyres on industrial vehicles . 4Bibliography .25ISO 4250-2:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). T
6、he 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 organizations, governmental and non-go
7、vernmental, 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 used to develop this document and those intended for its further maintenance are described
8、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
9、 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 l
10、ist 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 the meaning of ISO specific terms and expressions related to conformity assessment, as we
11、ll 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/TC 31, Tyres, rims and valves, Subcommittee SC 6, Off-the-road tyres and rims.This fifth
12、 edition cancels and replaces the fourth edition (ISO 4250-2:2006), which has been technically revised.ISO 4250 consists of the following parts, under the general title Earth-mover tyres and rims: Part 1: Tyre designation and dimensions Part 2: Loads and inflation pressures Part 3: Rimsiv ISO 2014 A
13、ll rights reservedINTERNATIONAL STANDARD ISO 4250-2:2014(E)Earth-mover tyres and rims Part 2: Loads and inflation pressures1 ScopeThis International Standard consists of three parts laying down the technical designation and dimensions of tyres and rims for earth-movers; it also gives load tables for
14、 these tyres.This part of ISO 4250 gives working definitions of masses 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, in whole or in part, are norma
15、tively referenced in this document and are indispensable for its application. 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
16、 Part 1: Pneumatic tyres3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4223-1 and the following apply.NOTE For a list of equivalent terms, see ISO 3877-1.13.1 Definitions of masses3.1.1maximum loadmaximum load of individual tyres determined by the ma
17、nufacturers rated gross machine mass (GMM) distribution assigned to each axle, divided by the number of 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
18、of GMM.3.1.1.1operating massnet weightactual mass of the base machine with equipment specified by the manufacturer, operator (75 kg), full fuel tank, and full lubricating, hydraulic, and cooling systems3.1.1.2optional equipment massdifference in operating mass between the optional item and standard
19、item replaced (such as 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-conditioners, etc.) ISO 2014 All rights reserved 1ISO 4250-2:
20、2014(E)3.1.1.3mass of special modificationsdifference in the operating mass of the machine due to modifications not previously covered in optional equipment mass (such as additional reinforcements, etc.)3.1.1.4payloadtotal mass of the material being carried3.1.1.5field modificationoperating mass cha
21、nge due to machine alterations made other than by the original manufacturer (such as 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 machine self-loads
22、 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 category are mainly haulage truc
23、ks (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: Transportation speeds are low, up t
24、o 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 unimproved surfaces at low speeds,
25、 up to 25 km/h, and short distances, up to 600 m.Note 2 to entry: Machines in this category consist mainly of loaders, log stackers, and material-handling equipment.Note 3 to entry: Tyre manufacturers should be consulted for specific conditions.3.2.5dozer (tractor) cyclecondition where a machine is
26、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.2 ISO 2014 All rights reservedISO 4250-2:2014(E)3.2.6grader cyclecondition
27、where a machine is used in construction and road maintenanceNote 1 to entry: Tyre loads are relatively constant during the 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 de
28、pending on the work situations.3.2.7creepmovement of equipment at a very low speed (commonly not over 120 m in 60 min)Note 1 to entry: During creep motion, loads on the tyres are usually very high and consideration needs to be given to the type of surface over which the equipment is travelling.Note
29、2 to entry: Tyre manufacturers should be consulted for specific conditions.3.2.8drive-awaymovement of a machine from one location to another under non-working conditionsNote 1 to entry: This movement occurs during transportation of a machine from site to site.Note 2 to entry: Tyre manufacturers shou
30、ld be consulted for specific conditions.Note 3 to entry: Load/speed/distance tables in this part of ISO 4250 do not apply to drive-away conditions.3.3 Definition of vehicle type3.3.1industrial vehiclevehicle including counterbalanced lift trucks, container handlers, straddle carriers, aircraft tow t
31、ractors, mobile crushers, log stackers4 Special conditionsFor longer hauls and/or speeds in excess of those indicated in the tables, the tyre manufacturers should be consulted for instructions regarding permissible loads and the required inflation pressures.5 Selection of tyres for new machine desig
32、nSelection of size and strength index of the tyre used on each axle shall be based on the highest individual wheel load as determined by gross machine mass (GMM) distribution, including load transfer and the machine application.Maximum load per tyre shall not be greater than that specified in the ap
33、plicable tables.The performance of machines fitted with earth-mover tyres depends on the operating conditions, and more particularly on the specific ground pressure which is governed by the inflation pressure. It is therefore advisable to select tyre size on the basis of low inflation pressure.6 Inf
34、lation pressures General6.1 Tyres covered by this part of ISO 4250 shall not exceed a cold inflation pressure of 1 000 kPa. Rim and wheel manufacturers shall be consulted to determine if the rim and wheel are of sufficient strength for the intended service conditions. ISO 2014 All rights reserved 3I
35、SO 4250-2:2014(E)6.2 Inflation pressures shown in the load/inflation tables are reference pressures and do not include any pressure build-up due to vehicle operation. In practice, tyre inflation pressure recommended by the different tyre manufacturers can vary according to the reference pressure.6.3
36、 In agreement with tyre manufacturers, inflation pressures can be adjusted to compensate for extremes atmospheric temperature or special operating conditions.7 Load/inflation tablesLoad/inflation relations for diagonal ply rating tyres are given in Tables 1 to 8; those for symbol-marked radial tyres
37、 are given in Tables 9 to 18.8 Load capacities for earth-mover tyres on industrial vehiclesFor industrial application, it is recommended to use specific tyres designed for this purpose.If tyres designed for earth-mover application are used, a formal approval from the tyre and wheel manufacturers is
38、required as not all the earth-mover tyres can be used in such conditions.Load capacities for earth-mover tyres on industrial vehicles are given in Table 19.Table 1 Diagonal ply rating marked narrow base tyres for earth-moving slow speed service, reference speed of 10 km/h (loaded conditions)Tyre siz
39、e designationPly ratingLoadabkgInflation pressurebkPa12.002014 5 000 60016 5 450 70020 6 150 82524 6 900 1 00012.0024and12.00258 4 000 32514 5 600 57516 6 150 67518 6 500 75020 6 900 82513.0024and13.00258 4 375 30012 5 600 45018 7 100 67520 7 500 75022 8 000 82514.002020 7 500 70024 8 500 850aFor st
40、ationary service conditions, the loads in this table may be increased up to 60 % with no increase in inflation pressure.bFor special equipment with a high centre of gravity, consult the tyre manufacturer.4 ISO 2014 All rights reservedISO 4250-2:2014(E)Tyre size designationPly ratingLoadabkgInflation
41、 pressurebkPa14.0024and14.00258 4 875 27510 5 600 35012 6 300 42516 7 300 55020 8 500 70024 9 500 85028 10 000 92516.0020and16.002120 8 750 55024 9 750 65028 10 600 77516.0024and16.002512 7 100 32516 8 250 42520 9 750 55024 10 600 65028 11 500 75032 12 500 87536 13 600 97518.0024and18.002512 8 250 2
42、7516 10 000 37520 11 500 47524 12 500 55028 13 600 65032 15 000 75036 16 000 85040 17 000 95018.003328 16 000 65032 17 500 75036 18 500 85018.004924 18 500 55028 20 000 65032 21 800 75021.0024and21.002516 11 800 32520 13 200 40024 15 000 50028 16 500 575aFor stationary service conditions, the loads
43、in this table may be increased up to 60 % with no increase in inflation pressure.bFor special equipment with a high centre of gravity, consult the tyre manufacturer.Table 1 (continued) ISO 2014 All rights reserved 5ISO 4250-2:2014(E)Tyre size designationPly ratingLoadabkgInflation pressurebkPa21.003
44、528 19 500 57532 21 200 65036 23 000 75040 24 300 82544 25 000 90021.004928 23 600 57532 25 000 65036 27 250 75040 29 000 82544 30 750 90024.002524 18 000 42530 20 000 52524.002924 19 000 42530 21 800 52524.003536 26 500 65042 29 000 75048 31 500 85054 34 500 97524.004336 30 000 65042 32 500 75048 3
45、4 500 85024.004936 32 500 65042 34 500 75048 37 500 85027.003324 22 400 35030 25 750 45036 29 000 55027.004936 36 500 57542 40 000 67548 43 750 77530.005140 45 000 57546 48 750 65052 53 000 75033.005142 51 500 55050 56 000 65058 61 500 750aFor stationary service conditions, the loads in this table m
46、ay be increased up to 60 % with no increase in inflation pressure.bFor special equipment with a high centre of gravity, consult the tyre manufacturer.Table 1 (continued)6 ISO 2014 All rights reservedISO 4250-2:2014(E)Tyre size designationPly ratingLoadabkgInflation pressurebkPa36.005142 58 000 50050
47、 65 000 60058 71 000 67540.005752 80 000 55060 87 500 65068 92 500 725aFor stationary service conditions, the loads in this table may be increased up to 60 % with no increase in inflation pressure.bFor special equipment with a high centre of gravity, consult the tyre manufacturer.Table 2 Diagonal pl
48、y rating marked narrow-base tyres for earth-moving service for relatively short hauls, reference speed 50 km/hTyre size designationPly ratingLoadakgInflation pressure kPa12.0020and12.002114 2 800 42516 3 000 47512.0024and12.00258 2 180 22514 3 000 37516 3 250 45018 3 550 50020 3 750 55013.0024and13.
49、00258 2 360 20012 3 000 30018 3 875 45020 4 000 50022 4 250 55014.002016 3 650 37520 4 125 47514.0024and14.00258 2 575 17510 3 000 22512 3 350 27516 4 000 37520 4 625 47524 5 150 57528 5 600 65016.002116 4 375 32520 5 000 400aLoad adjustment for maximum speed 65 km/h: load 0,85.Table 1 (continued) ISO 2014 All rights reserved 7ISO 4250-2:2014(E)Tyre size designationPly ratingLoadakgInflation pressure kPa16.0024and16.002512 3 875 22516 4 875 32520 5 450 40024 6 000 47528 6 700 57532 7 300 6
