1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2003 Society of Automotive Engineers, Inc.All rights reserved. No part of this
3、 publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (o
4、utside USA)Fax: 724-776-0790Email: custsvcsae.orgSAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLESTANDARDJ2523ISSUEDAUG2003Issued 2003-08Rolling Circumference Index Groups for Radial Tractor Drive Tires1. ScopeThis SAE Standard is established for the following purpose:a. Simplify the application of
5、radial drive wheel tires to agricultural vehicles especially those with multipledrive axles having tires of different sizes.b. Provide a pattern to combine similar sized tires into Rolling Circumference Index groups withuniform spacing between groups.c. Bias drive tires are not included in this Stan
6、dard.2. References2.1 Applicable PublicationsThe following publication forms a part of this specification to the extent specifiedherein.2.1.1 TIRE AND RIM ASSOCIATION, INC.Tire and Rim Association, 175 Montrose West Avenue, Suite 150, Copley,OH 44321.Tire and Rim Association, Inc. Annual Year Book3.
7、 Definitions3.1 Rolling Circumference (RC)The distance traveled by a tire in one revolution with no relative slip betweenthe tire and ground. The measurement is made on a flat level hard surface and unless otherwise specified isdone with the tire loaded to its rated capacity and inflated to its corr
8、esponding rated inflation pressure.3.2 Rolling Circumference Index (RCI)An integer index value assigned to each rolling circumference targetdimension. The index is selected to begin at RCI = 0 for a RC of 500 mm. For an increase of 10:1 in RC, 44steps of approximately 5.4%/step occur.(Eq. 1)3.3 Tole
9、rance Any particular tire size may be assigned to a nominal RCI number group per the following formula:(Eq. 2)RCnom50010RCI 44()() Round to nearest 5 mm=RCI ROUND 44LOG10 RC 500()()0.2 RCI max deviation=SAE J2523 Issued AUG2003-2-3.4 Tire MarkingAdding the RCI number to the tire identification (side
10、wall stamping) is optional but if applied should be of the form: RCI 46 with a space between the RCI and the integer number (46 in this example).4. Technical Detail4.1 All dimensions are expressed in SI units.4.2 Rolling Circumference Index groups have been selected to accommodate existing tire size
11、s. As a result,vehicles designed for use with existing tires should work with tires designed to the new standard and newvehicles designed for new tire sizes should also accept many existing sizes.4.3 The ratio of Rolling Circumference is the same between any two Rolling Circumference Index groups ha
12、vingthe same difference in RCI group numbers. This allows convenient identification of suitable tire sets in MFWDtractors. For example, a rear tire in RCI group 46 mated with a front tire in RCI group 41 represents a 5 RCIstep difference. Any other tire set with a 5 RCI step difference would mechani
13、cally fit the tractor.4.4 Tires with industry service codes R-1 and R-1W have whole number RCI values whereas service code R-2tires are positioned on the 0.5 increment of RCI due to the unique dimensional difference associated with R-2tires.4.5 Basic tire dimensions for each tire size are as defined
14、 by the Tire and Rim Association, Inc., and other tirestandards publications.4.6 Figures 1 and 2 show representative radial tires positioned in their respective locations in the RCI familygroups. This list is not intended to be all-inclusive. Contact your tire supplier for additional available radia
15、lsizes and what RCI value those tires have and where they fit in the group tables.SAE J2523 Issued AUG2003-3-FIGURE 1Recommended R-1 and R-1W Tires for TractorsSAE J2523 Issued AUG2003-4-FIGURE 2Recommended R-2 Tires for TractorsPREPARED BY THE SAE AGRICULTURAL TRACTOR TIRE SUBCOMMITTEE OFTHE SAE AG
16、RICULTURAL TRACTOR STANDARDS COMMITTEESAE J2523 Issued AUG2003RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Standard is established for the following purpose:a. Simplify the application of radial drive wheel tires to agricultural vehicles espe
17、cially those withmultiple drive axle having tires of different sizes.b. Provide a pattern to combine similar sized tires into Rolling Circumference Index groups withuniform spacing between groups.c. Bias drive tires are not included in this Standard.Reference SectionTire and Rim Association, Inc. Annual Year BookDeveloped by the SAE Agricultural Tractor Tire SubcommitteeSponsored by the SAE Agricultural Tractor Standards Committee
