1 Scope
This standard specified the structural types, designation methods, boundary dimensions and technical conditions of disc bearings for agricultural machinery (hereinafter referred to as “bearings”).
This standard is applicable to production, inspection and customer’s type selection and acceptance of disc harrow (plough) bearings for agricultural machinery. Bearings of other types for agricultural machinery may also refer to this standard.
2 Normative References
The provisions of following documents are recognized as the provisions of this standard after quoting. All dated reference, subsequent amendments (excluding corrections), or revisions are not suitable for this. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents applies. For undated references, the latest edition of the normative document referred to applies.
GB/T 272-1993 Rolling Bearing-Identification Code
GB/T 276-1994 Rolling Bearings-Deep Groove Ball Bearings-Boundary Dimensions
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 708-2006 Dimension Shape Weight and Tolerance for Cold-rolled Steel Plates and Sheets
GB/T 4199-2003 Rolling Bearings-Tolerances-Definitions (ISO 1132-1: 2000, Rolling Bearings-Tolerances-Part 1: Terms and Definitions, MOD)
GB/T 4604-2006 Rolling Bearings-Radial Internal Clearance (ISO 5753: 1991, MOD)
GB/T 6930-2002 Rolling Bearings-Vocabulary (ISO 5593: 1997, IDT)
GB/T 7324-1994 General Purpose Lithium Lubricating Grease
GB/T 7811-2007 Rolling Bearings-Symbols for Quantities (ISO 15241: 2001, IDT)
GB/T 8597-2003 Rolling Bearings-Rust Proof Packaging
GB/T 13237-1991 Cold-rolled Quality Carbon Structural Steel Sheets and Strips
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/T3574-1997 Rolling Bearings-Marking for Products
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 7048-2002 Rolling Bearing Parts-Plastic Cage-Specifications
JB/T 7051-2006 Rolling Bearing Parts-Methods for the Measurement and Assessment of Surface Roughness
JB/T 8921-1999 Rolling Bearings and Commercial Parts-Inspection Rules
Contents
Foreword I
1 Scope
2 Normative References
3 Terms, Definitions and Symbols
3.1 Terms and Definitions
3.2 Symbols (see Figure 1~Figure 10)
4 Designation Methods
4.1 Basic Code
4.2 Suffix Code
5 Boundary Dimensions
6 Technical Requirements
6.1 Material and Heat Treatment
6.2 Tolerances
6.3 Surface Roughness
6.4 Internal Clearance
6.5 Residual Magnetism
6.6 Lubrication and Sealing
6.7 Others
7 Test Methods
8 Inspection Rules
9 Marking
10 Packaging
Appendix A (Informative) Boundary Dimension of Common Bearings
A.1 Bearing with Cylindrical Bore
A.2 Bearing with Square Bore
A.3 Hexagonal-bore Bearing
Appendix B (Informative) Slurry Test
B.1 Test Purpose
B.2 Test Device (See Figure B.1)
B.3 Test Conditions
B.4 Rest Methods
Figure 1 DC...PP Type DS...PP Type
Figure 2 DC...PP/R Type DS...PP/R Type
Figure 3 DC...PPWB Type DS...PPWB Type
Figure 4 DC...PPWB/R Type DS...PPWB/R Type
Figure 5 DC...SQ-PP Type DS...SQ-PP Type
Figure 6 DC...SQ-PP/R Type DS...SQ-PP/R Type
Figure 7 DC...SQ-PPWB Type DS...SQ-PPWB Type
Figure 8 DC...SQ-PPWB/R Type DS...SQ-PPWB/R Type
Figure 9 DC...HX-PPWB Type DS...HX-PPWB Type
Figure 10 DC...HX-PPWB/R Type DS...HX-PPWB/R Type
Figure B.1 Diagram for Test Device
Table 1 Type Code
Table 2 Suffix Code
Table 3 Inner Ring
Table 4 Outer Ring
Table 5 Sampling Inspection Items
Table A.1 Bearing with Cylindrical Bore (Inner Ring Width Equals to the Outer Ring Width)
Table A.2 Bearing with Cylindrical Bore (Wide Inner Ring)
Table A.3 Bearing with Square Bore (Inner Ring Width Equals to the Outer Ring Width)
Table A.4 Bearing with Square Bore (Wide Inner Ring)
Table A.5 Hexagonal-bore Bearing (Wide Inner Ring)
