Standard No.:	JB/T 10859-2008
English Name:	Rolling bearings—Tensioner and idler bearings and units for automotive engine
Chinese Name:	滚动轴承 汽车发动机张紧轮和惰轮轴承及其单元
Chinese Classification:	J11    Rolling bearing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	21.100.20 21.100.20    Rolling bearings 21.100.20
Source Content Issued by:	NDRC
Issued on:	2008-03-12
Implemented on:	2008-9-1
Status:	superseded
Superseded by:	JB/T 10859-2024 JB/T 10859-2025 Rolling bearing - Automobile engine tensioner and idler bearing and unit
Superseded on:	2025-11-1
Abolished on:	2025-11-01
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the definitions, designation method, structural type, technical requirements, inspection rules and test methods of tensioner and idler bearings for automotive engine (hereinafter referred to as bearings) and of tensioner and idler units (hereinafter referred to as units). This standard is applicable to the production and inspection of bearing manufacturers and the customer acceptance. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB/T 272-1993 Rolling Bearing-Identification Code GB/T 307.1-2005 Rolling Bearings-Radial Bearings-Tolerances (ISO 492: 2002, MOD) GB/T 307.2-2005 Rolling Bearings-Measuring and Gauging Principles and Methods (ISO 1132-2: 2001, Rolling bearings-Tolerances-Part 2: Measuring and gauging principles and methods, MOD) GB/T 307.3-2005 Rolling Bearings-General Technical Regulations GB/T 308-2002 Rolling Bearings-Steel Balls (ISO 3290: 1998, NEQ) GB/T 2829-2002 Sampling Procedures and Tables for Periodic Inspection by Attributes (Apply to Inspection of Process Stability) GB/T 3203-1982 Specification for Carburizing Steels of Bearings GB/T 4604-2006 Rolling Bearings-Radial Internal Clearance(ISO 5753: 1991, MOD) GB/T 8597-2003 Rolling Bearings-Rust Proof Packaging GB/T 18254-2002 High-carbon Chromium Bearing Steel JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel JB/T 2974-2004 Rolling Bearings-Identification Code-Supplemental Regulations JB/T 3573-2004 Rolling Bearings-Methods for the Measurement of Radial Internal Clearance JB/T 3574-1997 Rolling Bearings-Marking for Products JB/T 5313-2001 Rolling Bearing-Measuring Methods for Vibration（Velocity） JB/T 5314-2002 Rolling bearing-Measuring Methods for Vibration (Acceleration) JB/T 6639-2004 Rolling Bearing Parts-Skeleton Acrylonitrile-buta-diene Copolymers Seal-Specifications JB/T 6641-2007 Rolling Bearings-Residual Magnetism and Its Assessment Method JB/T 7047-2006 Rolling Bearings-Specifications of Vibration (Acceleration) for Deep Groove Ball Bearings JB/T 7048-2002 Rolling Bearing Parts-Plastic Cage-Specifications JB/T 7050-2005 Rolling Bearings-Assessment Methods for Cleanliness JB/T 7051-2006 Rolling Bearing Parts-Methods for the Measurement and Assessment of Surface Roughness JB/T 7752-2005 Rolling Bearings-Sealed Deep Groove Ball Bearings-Specifications JB/T 8571-2008 Rolling Bearings-Sealed Deep Groove Ball Bearings-Performance Test Rule of Dustproofing, Grease Leakage and Temperature Rise JB/T 8881-2001 Specifications for Carburizing Heat Treatment of Rolling Bearing Parts JB/T 8921-1999 Rolling Bearings and Commercial Parts-Inspection Rules JB/T 10187-2000 Rolling Bearings - Deep Groove Ball Bearing Vibration (Velocity)-Specifications JB/T 10336-2002 Rolling Bearings and Parts-Supplementary Specifications JB/T 10337-2002 Rolling Bearing Parts-Pressing Cage-Specifications

Contents Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 Designation Method 4.1 Type Code of Tensioner and Idler 4.2 Stent Code 4.3 Type Code of Pulley 4.4 Type Code of Bearing 4.5 Dimension Code 4.6 Suffix Code 4.7 Code Example 5 Main Structural Type 6 Technical Requirements 6.1 Materials and Heat Treatment 6.2 Tolerance 6.3 Surface Roughness 6.4 Contact Angle 6.5 Internal Clearance 6.6 Residual Magnetism 6.7 Cleanliness 6.8 Vibration 6.9 Automatic Tensile Force (moment) 6.10 Rotating Flexibility 6.11 Lubrication and Sealing 6.12 Appearance Quality 6.13 Axial Pulling-Out Force 6.14 Service Life 6.15 Others 7 Inspection and Test Methods 7.1 Tolerance 7.2 Surface Roughness 7.3 Internal Clearance 7.4 Residual Magnetism 7.5 Cleanliness 7.6 Vibration 7.7 Grease Leakage, Temperature Rise and Dust-proof Performance Test 7.8 Appearance Quality 7.9 Axial Pulling-Out Force 7.10 Service Life Test 7.11 Automatic Tensile Force (Moment) 8 Inspection Rules 8.1 Delivery Inspection 8.2 Type Inspection 9 Marking 10 Packaging