1、NAVISTAR, INC. TMS (TRUCK MATERIAL SPECIFICATION) NUMBER: TMS-1065 TITLE: Tapered Roller Bearings for Wheel End Applications CURRENT REV. No.: 0806 DATE: June 2008 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: Rev A - APRIL 2007 PRINTED COPIES OF THIS DOCUME
2、NT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to d
3、etermine the applicability of regulatory limits prior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive; revised method of inclusion rating determination from ASTM E 45, Method D, to Method A in Section 4.3; editorial changes.
4、Reference: File 17; 20-1 Keywords: Tapered Wheel End Roller Bearings, Through-Hardened Bearings. 1.0 APPLICATION This specification covers material requirements for tapered roller bearings to be used in wheel end applications. The bearing steels covered by this specification may be of two types: Typ
5、e 1 - Case hardened (carburized) Type 2 - Through-hardened 2.0 SCOPE This specification covers requirements for material, chemical composition microstructure, dimensional tolerances, post-hardening treatments, design performance validation, quality, source approval/quality control, shipping, and ide
6、ntification. 2.1 Restricted Chemical SubstancesEffective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise specified the latest issue of all referenced standards s
7、hall apply. The following Specifications, Standards, and Regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 ASTM A 29 CFR 29, Part 1910 ASTM A 295 NAVISTAR Manufacturing Std. MS-D-13 ASTM A 534 NAVISTAR CEMS A-0, Part I ASTM A 892 NAVISTAR CEMS A-0, Part I
8、II ASTM E 45 NAVISTAR CEMS A-40 Part A ASTM E 112 NAVISTAR CEMS A-52 ANSI/ABMA 19.1 NAVISTAR CEMS B-50 ANSI/ABMA 19.2 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all paten
9、t liability. 2008 by Navistar, Inc. JUNE 2008 Page 1 of 5 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: REVISION: TMS-1065 Tapered Roller Bearings for Wheel End A
10、pplications 0806 This document is restricted and may not be sent outside Navistar Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. 4.0 REQUIREMENTS 4.1 Material Steel for individual bearings will b
11、e selected on the basis of section size, hardenability, quench rate, furnace load factors, etc. Such selection to achieve optimum (minimum) properties in specific parts is the responsibility of the bearing manufacturer. 4.1.1 Cups, Cones and Rollers The steel used shall be made by a process capable
12、of providing a high quality product, shall be vacuum degassed, fully killed, made to fine grain practice, and shall meet quality tests, chemical composition, minimum steel cleanliness, grain size, hardenability, decarburization, surface imperfection, microstructure and hardness requirements as descr
13、ibed in ASTM A 534 for Carburizing Steels used in Type 1 bearings and ASTM A 295 for High Carbon Steels used in Type 2 bearings. Reduction ratio shall be 7:1 minimum. 4.1.2 Bearing Cages Open hearth, basic oxygen or electric furnace, ingot cast or strand cast, steel may be used for bearing cages. Un
14、less otherwise specified, steel used for bearing cages will meet requirements of ASTM A 29, and steel cleanliness will meet requirements of CEMS A-0, Part I, Quality Level I. 4.2 Chemical Composition 4.2.1 Type 1 Steels used for the rollers, cups, and cones of Type 1 bearings shall meet the general
15、composition requirements for 4118H or 8620H steels or equivalent as described in ASTM A 534, or as agreed upon between NAVISTAR and the supplier. 4.2.2 Type 2 Steels used for the rollers, cups, and cones of Type 2 bearings shall meet the general composition requirements for 52100 steel or its equiva
16、lent as described in ASTM A 295, or as agreed upon between NAVISTAR and the supplier. 4.3 Microstructure 4.3.1. Type 1 Carburized bearings shall have a case microstructure consisting of a quenched and tempered high carbon martensite matrix. The amount of retained austenite in the case shall not exce
17、ed 30%. The core shall consist of low carbon martensite with various amounts of bainite and ferrite depending on steel selection. Inclusion rating shall be determined per ASTM E 45 Method A. The average of all specimens tested, as well as 67% of all specimens, will not exceed the rating specified in
18、 Table 1. 4.3.2 Type 2 Through-hardened bearings shall have a homogeneous microstructure consisting of fine, uniformly distributed carbides per ASTM A 892 in a lightly tempered martensitic matrix. The amount of retained austenite shall not exceed 15%. Carbide size rating will not be greater than CS3
19、; carbide network rating will not be greater than CN3; lamellar content will not be greater than LC1 per ASTM A 892. No decarburization or evidence of significant carbon depletion will be allowed. Inclusion rating shall be determined per ASTM E 45 Method A. The average of all specimens tested, as we
20、ll as 67% of all specimens, will not exceed the rating specified in Table 1. JUNE 2008 Page 2 of 5 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: REVISION: TMS-106
21、5 Tapered Roller Bearings for Wheel End Applications 0806 This document is restricted and may not be sent outside Navistar Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. Table 1. Inclusion Rating
22、s Type A Type B Type C Type D Thin Thick Thin Thick Thin Thick Thin Thick 2.5 1.5 2.0 1.0 0.5 0.5 1.0 1.0 4.4 Hardness 4.4.1 Type 1 Surface hardness for Type 1 bearing rollers, cups and cones shall be 58-64 HRC. Core hardness for Type 1 bearing rollers, cups and cones shall be 25 HRC minimum. 4.4.2
23、Type 2 Surface hardness for Type 2 bearings rollers cups and cones shall be 60-64 HRC. 4.5 Dimensional Tolerances 4.5.1 Critical dimensional tolerances of all cups, cones, rollers, and the assemblies thereof shall conform to requirements of ANSI/ABMA standards 19.1 and 19.2 unless otherwise specifie
24、d by NAVISTAR. 4.5.2 Surface roughness on all finished bearing surfaces shall not exceed an Ra value of 8 microinches. Rollers and cup and cone race surfaces shall be ground such that contact surfaces have a suitable crowned profile. Radius, parabolic and logarithmic profiles are acceptable, however
25、, it is strongly recommended that cups and rollers be matched in terms of profile type and height. The crown height shall be 160 microinches (4 microns) minimum. 4.6 Surface DefectsRollers, cups and cones for both Type 1 and Type 2 bearings shall be free from cracks, pipes, pits, scratches, seams, l
26、aps, rust, decarburization and indications of soft spots visible under microscopic inspection. 4.7 Design and Validation 4.7.1 Design Life 4.7.1.1 Theoretical life calculations based on required loads and duty cycles (as given by TDTC Engineering) will be provided by supplier for approval by Enginee
27、ring. 4.7.1.2 Supplier will provide for approval by TDTC Engineering a comparison of the theoretical life calculations to actual bench testing for correlation of dynamic load ratings. 4.7.2 Validation The design is to meet the commercially reasonable hub bearing response and performance needs of the
28、 anticipated end user of a commercial vehicle to be used in the Bus, Medium, Severe Service, Regional, and Line Haul applications, with a 350,000; 350,000; 350,000; 750,000; and 1,200,000 miles; or 15, 10, 10, 10, 10 year life, respectively. These end user needs are based on vehicle conditions and w
29、heel-end bearing response that supplier or NAVISTAR could reasonably anticipate at the time the design specification is finally approved. The supplier is required to provide a design and validation of such design that will meet these applications. TDTC Engineering will review supplier designs and DV
30、P TMS-1065, Type 2; or TMS 1065, Type 1 or Type 2. 9.0 TECHNICAL INFORMATION For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. Truck Develop
31、ment and Technology Center 2911 Meyer Road Fort Wayne, IN 46803 E-mail: MaterialsEngineeringN Information Handling Service (IHS) 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/JUNE 2008 Page 5 of 5 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
