Linear Motion Rolling Bearings-Linear Needle Roller and Cage Assemblies
1 Scope
This standard specifies the structural types, designation methods, boundary dimensions and technical conditions of needle roller (including cylindrical roller) and cage assemblies (hereinafter referred to as “assemblies”) in linear motion rolling bearings.
This standard is applicable to the production, inspection and customer acceptance of assemblies.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments to (excluding the corrections to), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 8597-2003 Rolling Bearings-Rust Proof Packaging
GB/T 18254-2002 High-carbon Chromium Bearing Steel
GB/T 13237-1991 Cold-rolled Quality Carbon Structural Steel Sheets and Strips
JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel
JB/T 3574-1997 Rolling Bearings-Marking for Products
JB/T 8921-1999 Rolling Bearings and Commercial Parts - Inspection Rules
JB/T 10335-2002 Linear Motion Rolling Bearings-Classification and Designation
3 Symbols
Unless otherwise stated, the symbols shown in figures (excluding tolerance symbols) and the values given in the tables denote nominal dimensions.
B: Width of assembly;
Dw: Diameter of needle roller (cylindrical roller) in assembly;
L: Length of assembly;
b: The distance from one end of the assembly to anther end of the needle roller in the horizontal section of V-type assembly;
VDwsp: The diameter variation of needle roller (cylindrical roller) in single plane in the assembly;
VDwL: The diameter variation of a batch of needle rollers (cylindrical rollers) in assembly;
△Dwmp: The average diameter deviation of needle roller (cylindrical roller) in single plane in the assembly .
4 Designation Methods and Structural Types
4.1 Designation Methods
Designations of assemblies listed in this standard and their and meanings are detailed in JB/T 10335-2002.
4.2 Structural Types
This standard specifies two structural types of assemblies:
LNS…NC Single row needle roller (cylindrical roller) and cage flat assemblies (see Figure 1);
LNS…NCW Double row needle roller (cylindrical roller) and cage V-type assemblies (see Figure 2).
Contents
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Designation Methods and Structural Types
4.1 Designation Methods
4.2 Structural Types
5 Boundary Dimensions
6 Technical Requirements
6.1 Material and Heat Treatment
6.2 Tolerance
6.3 Appearance
6.4 Flexibility
6.5 Others
7 Measurement Methods
7.1 Tolerances
7.2 Rotating Flexibility
8 Inspection Rules
9 Marking
10 Packaging and Storage
11 Technical Requirements for Assembly-associated Parts
Appendix A (Informative) Technical Requirements for Assembly-associated Parts
A.1 Materials
A.2 Hardness
A.3 Surface Roughness
