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.QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (412) 776-4970 FAX: (412) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1997 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National Sta
4、ndardJ1440REV.SEP93Issued 1986-04Revised 1993-09Superseding J1440 APR86(R) OFF-ROAD TIRE AND RIM CLASSIFICATION-FORESTRY MACHINESForewordTechnological advances in forestry machine designs and applications have necessitated the inception ofspecial tire designs and sizes. These tires form the classifi
5、cation LS (Log Skidder) which is defined as a lowpressure tire utilizing a lug type tread to obtain good traction in soft soil conditions. These tires are load capacityrated for operation at speeds up to and including 32 km/h (20 mph). Other types of off-road tires may be used onforestry machines (r
6、eference SAE J751).1. ScopeThis SAE Recommended Practice describes the classification of off-road tires and rims designedspecifically for forestry machines (see SAE J1116), defines related terminology in common use, and showsrepresentative construction details of component parts.1.1 PurposeTo establ
7、ish a standard nomenclature for tire classification LS (Log Skidder) tire and rimcomponents.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. The latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvail
8、able from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J751Off-Road Tire and Rim ClassificationConstruction MachinesSAE J1116Categories of Off-Road Self-Propelled Work Machines2.1.2 ISO PUBLICATIONSAvailable from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ISO 4223-1Definition o
9、f Some Terms Used in the Tire Industry, Part 1Pneumatic TiresISO 4251-1Tires and Rims (Existing Series) for Agriculture Tractors and Machines, Part 1TireDesignations and DimensionsISO 4251-3Rim DimensionsISO 4251-4Tire Classification and NomenclatureISO 4251-5Log Skidder TiresCopyright SAE Internati
10、onal Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-2-3. Definitions3.1 Tire DesignationLog skidder tires are identified by an alphanumeric designation, including the following:section width reference, a
11、construction indicator, rim designation, a carcass strength rating, and a servicecode.23.1-26 10 PR LS-228L-26 12 PR LS-33.1.1 SECTION WIDTH REFERENCEThe section width reference is the nominal tire width. There are two commonlyaccepted designations: conventional and low section height (exceptions ar
12、e covered in 3.1.1.3).3.1.1.1 ConventionalA conventional tire is indicated when the section width reference includes only digits with adecimal point (for example, 23.1). The aspect ratio of a conventional tire (section height/section width) isequal to or greater than 0.75.3.1.1.2 Low Section HeightA
13、 low section height tire is indicated when the section width reference consists ofdigits followed by the letter “L“ (for example, 28L or 30.5L). The aspect ratio is less than 0.75.3.1.1.3 ExceptionsLS constructions have been made using tire designations from other categories of off-roadtires for spe
14、cific forestry machines. Sizes currently in use include:67x34.00-2530.00-3337.5-3943.5-393.2 ConstructionBias ply is the basic tire construction. A bias ply construction is designated by a hyphen (-)following the designated section width reference (for example, 23.1-). Refer to Figure 1 for represen
15、tativeconstruction details.3.3 Rim Diameter DesignationThe rim diameter designation follows the section width reference andconstruction indicator and specifies the appropriate diameter rim (for example, 23.1-26).3.4 Carcass Strength RatingPly rating (PR) is the commonly accepted designation. Althoug
16、h ply rating is anindication of tire strength, it does not necessarily represent the actual number of cord plies in a tire.3.5 Service CodeForestry machines use tires of service code LS followed by numerical tread indicators 1, 2, or3 (for example, LS-2).3.5.1 LS-1 REGULAR TREADBased on the agricult
17、ural rear tractor tire of the same size designation, this tread typehas for the most part been replaced by the LS-2.3.5.2 LS-2 INTERMEDIATE TREADMore aggressive tread design with greater lug height and width. This is the mostcommon tread type used on forestry machines.3.5.3 LS-3 DEEP TREADMost aggre
18、ssive tread design with the greatest lug height. Most commonly used in verysoft swampy conditions.3.6 Machine ClearancesWhen designing for machine clearances, the maximum dimensions for grown tires inservice should be used (see Figure 2). Where specific tire dimensions are required, the definitions
19、in Figure 2are the recommended nomenclature for communication with the tire manufacturer.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-3-3.7 Rim DefinitionThe rim assembly is
20、that member on which the tire is mounted and supported. A rim contouris designated by an alphanumeric sequence which utilizes a combination of the following rim parameters: a rimdiameter designation, a rim profile designation, and a rim width reference number. The origin of the numericdesignation is
21、 inch units (for example, 26xDW20, 32xDW27TB).3.7.1 RIM DIAMETER DESIGNATIONThe rim diameter designation is a reference number for the diameter of the rimmeasured in inches (refer to Figure 3) (for example, 26 x DW20, 32 x DW27TB).3.7.2 RIM PROFILE DESIGNATIONThe rim profile designation is one or mo
22、re letters which signify the rim contour atthe tire to rim interface. This designation precedes the rim width, and in certain cases, additional lettersfollow the rim width to further describe the contour (for example, 26 x DW 20, 32 x DW 27 TB).3.7.3 RIM WIDTH REFERENCE NUMBERThe rim width reference
23、 number is the width as measured in inchesbetween flanges of the rim contour, as shown in Figure 3 (for example, 26 x DW 20, 32 x DW 27 TB).3.8 Rim ConstructionTwo basic types of rims are used with log skidder tires.3.8.1 SINGLE PIECERefer to Figures 3A, 3B, and 3C.3.8.2 SPLITRefer to Figure 3D.3.9
24、Rim and Wheel NomenclatureRefer to Figures 4A and 4B, and SAE J751.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-4-FIGURE 1NOMENCLATURE FOR FORESTRY TIRESCopyright SAE Interna
25、tional Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-5-FIGURE 2INDUSTRY METHOD FOR DEPICTING MAXIMUM DIMENSIONSFOR GROWN TIRES IN SERVICECopyright SAE International Provided by IHS under license with SAE
26、Not for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-6-FIGURE 3RIM CONTOURCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-7-F
27、IGURE 4RIM AND WHEEL NOMENCLATURE COMMON TO FORESTRY TIRESCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93-8-4. Notes4.1 Marginal IndiciaThe change bar (l) located in the left ma
28、rgin is for the convenience of the user in locatingareas where technical revisions have been made to the previous issue of the report. An (R) symbol to the leftof the document title indicates a complete revision of the report.PREPARED BY THE SAE OFF-ROAD MACHINERYTECHNICAL COMMITTEE SC2TIRE AND RIMC
29、opyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-SAE J1440 Revised SEP93RationaleThis SAE document is a five-year update of the existing SAE Recommended Practice. Thisdocument has been reformatted to com
30、ply with the SAE Technical Standards Board format.This document is to provide classification, definition of related terminology, and to show representativeconstruction details of component parts as related to forestry equipment. This document is useful tooriginal equipment manufacturers, tire manufa
31、cturers, tire service companies, and owner operators offorestry equipment.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Practice describes the classification of off-road tires and rimsdesigned specifically for forestry machines (see SAE J1116), defines re
32、lated terminology in commonuse, and shows representative construction details of component parts.Reference SectionSAE J751Off-Road Tire and Rim ClassificationConstruction MachinesSAE J1116Categories of Off-Road Self-Propelled Work MachinesISO 4223-1Definition of Some Terms Used in the Tire Industry,
33、 Part 1Pneumatic TiresISO 4251-1Tires and Rims (Existing Series) for Agriculture Tractors and Machines, Part 1TireDesignations and DimensionsISO 4251-3Rim DimensionsISO 4251-4Tire Classification and NomenclatureISO 4251-5Log Skidder TiresDeveloped by the SAE Off-Road Machinery Technical Committee SC2Tire and RimSponsored by the SAE Off-Road Machinery Technical CommitteeCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
