1 Scope
This part of JB/T 5389 specifies the main identification codes, structural types, boundary dimensions, technical specifications, inspection methods, inspection rules and marking and rustproof packaging of double-row tapered roller bearings for rolling mills (hereinafter referred to as the “double-row bearing”) and the four-row tapered roller bearings for rolling mills (hereinafter referred to as the “four-row bearing”).
This part is applicable to the production, inspection and acceptance of double-row and four-row tapered roller bearings for rolling mills.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 272 Rolling Bearing - Identification Code
GB/T 299-2008 Rolling Bearings - Metric Double Row Tapered Roller Bearings - Boundary Dimensions
GB/T 300-2008 Rolling Bearings - Four Row tapered Roller Bearings - Boundary Dimensions
GB/T 307.2-2005 Rolling Bearings - Measuring and Gauging Principles and Methods
GB/T 307.3-2005 Rolling Bearings - General Technical Regulations
GB/T 699-2015 Quality Carbon Structure Steel
GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips
GB/T 3203-2016 Specification for Carburizing Steels of Bearings
GB/T 4199-2003 Rolling Bearings - Tolerances - Definitions
GB/T 7811-2015 Rolling Bearings - Symbols for Physical Quantities
GB/T 8597-2013 Rolling Bearings - Rust Proof Packaging
GB/T 13237-2013 Cold Rolled Quality Carbon Structural Steel Sheets and Strips
GB/T 18254-2016 High-carbon Chromium Bearing Steel
GB/T 24605-2009 Rolling Bearings - Marking for Products
GB/T 24608-2009 Inspection Rules for Rolling Bearings and Commercial Parts
JB/T 1255-2014 Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment
JB/T 7051-2006 Rolling Bearing Parts - Methods for the Measurement and Assessment of Surface Roughness
JB/T 8236-2010 Rolling Bearings - Internal Clearances and Adjusting Methods for Double-row and Four-row Tapered Roller Bearings
JB/T 8881-2011 Rolling Bearings - Carburizing Heat - Treatment for Parts - Specifications
JB/T 10336-2017 Rolling Bearings - Supplementary Specifications
3 Symbols
For the purposes of this document, the symbols given in GB/T 4199-2003 and GB/T 7811-2015 and the following apply.
D1mp max-D2mp min: the difference between the maximum and minimum mean outside diameters of the outer rings of a bearing.
d1mp max-d2mp min: the difference between the maximum and minimum mean bore diameters of the inner rings of a bearing.
r: the nominal chamfer of inner ring
rsmin: the minimum single chamfer dimension of inner ring
r1: the nominal chamfer of outer ring
r1min: the minimum single chamfer dimension of outer ring
T3: the width of Type 370000 and Type 370000D double-row tapered roller bearings (assembly)
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Identification Code
5 Main Structural Types (See Figures 1~4)
6 Boundary Dimensions
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Marking
11 Rustproof Packaging
1 Scope
This part of JB/T 5389 specifies the main identification codes, structural types, boundary dimensions, technical specifications, inspection methods, inspection rules and marking and rustproof packaging of double-row tapered roller bearings for rolling mills (hereinafter referred to as the “double-row bearing”) and the four-row tapered roller bearings for rolling mills (hereinafter referred to as the “four-row bearing”).
This part is applicable to the production, inspection and acceptance of double-row and four-row tapered roller bearings for rolling mills.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 272 Rolling Bearing - Identification Code
GB/T 299-2008 Rolling Bearings - Metric Double Row Tapered Roller Bearings - Boundary Dimensions
GB/T 300-2008 Rolling Bearings - Four Row tapered Roller Bearings - Boundary Dimensions
GB/T 307.2-2005 Rolling Bearings - Measuring and Gauging Principles and Methods
GB/T 307.3-2005 Rolling Bearings - General Technical Regulations
GB/T 699-2015 Quality Carbon Structure Steel
GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips
GB/T 3203-2016 Specification for Carburizing Steels of Bearings
GB/T 4199-2003 Rolling Bearings - Tolerances - Definitions
GB/T 7811-2015 Rolling Bearings - Symbols for Physical Quantities
GB/T 8597-2013 Rolling Bearings - Rust Proof Packaging
GB/T 13237-2013 Cold Rolled Quality Carbon Structural Steel Sheets and Strips
GB/T 18254-2016 High-carbon Chromium Bearing Steel
GB/T 24605-2009 Rolling Bearings - Marking for Products
GB/T 24608-2009 Inspection Rules for Rolling Bearings and Commercial Parts
JB/T 1255-2014 Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment
JB/T 7051-2006 Rolling Bearing Parts - Methods for the Measurement and Assessment of Surface Roughness
JB/T 8236-2010 Rolling Bearings - Internal Clearances and Adjusting Methods for Double-row and Four-row Tapered Roller Bearings
JB/T 8881-2011 Rolling Bearings - Carburizing Heat - Treatment for Parts - Specifications
JB/T 10336-2017 Rolling Bearings - Supplementary Specifications
3 Symbols
For the purposes of this document, the symbols given in GB/T 4199-2003 and GB/T 7811-2015 and the following apply.
D1mp max-D2mp min: the difference between the maximum and minimum mean outside diameters of the outer rings of a bearing.
d1mp max-d2mp min: the difference between the maximum and minimum mean bore diameters of the inner rings of a bearing.
r: the nominal chamfer of inner ring
rsmin: the minimum single chamfer dimension of inner ring
r1: the nominal chamfer of outer ring
r1min: the minimum single chamfer dimension of outer ring
T3: the width of Type 370000 and Type 370000D double-row tapered roller bearings (assembly)
Contents of JB/T 5389.2-2017
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Identification Code
5 Main Structural Types (See Figures 1~4)
6 Boundary Dimensions
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Marking
11 Rustproof Packaging
