Linear Motion Rolling Bearings-Block Type Recirculating Linear Needle Roller (or Roller) Bearings
直线运动滚动支承 循环式滚针、滚子导轨支承
1 Scope
This standard specifies the structural types, boundary dimensions, tolerances and technical conditions for block type recirculating needle roller bearings and recirculating roller bearings among the linear motion rolling bearings.
This standard is applicable to the manufacture, inspection and acceptance of block type recirculating needle roller (or roller) bearings (hereinafter referred to as “guide bearings”).
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 (excluding corrections) to, or revisions of, any of these publications do not apply. 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 1804-2000 General Tolerances-Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (eqv ISO 2768-1: 1989)
GB/T 4199-2003 Rolling Bearings-Tolerances-Definitions (ISO 1132-1: 2000, MOD)
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 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 7051-1993 Rolling Bearings Parts-Methods for the Measurement and Assessment of Surface Roughness
JB/T 8921-1999 Rolling Bearings and Commercial Parts-Inspection Rules
JB/T 10335 - 2002 Linear Motion Rolling Bearings-Classification and Designation
3 Symbols
For the purpose of this standard, symbols specified in GB/T 4199 and the following ones apply.
Unless otherwise stated, all dimensions given in Table 1~Table 4 corresponding to the symbols shown in Figure 1~ Figure 5 denote nominal dimensions.
A: The height from the guide bearing rolling surface (the surface formed by contacting with the guide bearing rolling element) to the mounting reference face.
B: The width of guide bearing
B1: The width of mounting side-ear of needle roller bearing in the axial direction of needle roller
h: The thickness of mounting side-ear of guide bearing
J: The distance between two mounting holes of guide bearing in axial direction of needle roller (roller)
J1: The distance between two mounting holes in motion direction of guide bearing
L: The length of guide bearing
L1: The length of mounting side-ear of needle roller bearing
L2: The length of supporting element of roller bearing
Lw: The roller length of roller bearing
N: The diameter of guide bearing mounting hole
T: The height of guide bearing (for guide bearing without mounting side-ear, T=A)
T1: The distance from the mounting hole axis of roller bearing to the bearing reference face
δ: The distance of needle roller (roller) protruding out of housing of guide bearing
VAmL: The grouping variation of guide bearing height, namely, in the group of same height, the difference between the guide bearing with highest average height from the guide bearing rolling surface to the mounting reference face and the guide bearing with lowest average height
VAs: The variation of height from the guide bearing rolling surface to the mounting reference face
ΔAs: The deviation of height from the guide bearing rolling surface (the surface formed by contacting with the guide bearing, the same bellow) to the mounting reference face (for LRS 0000 SGK type, it is the bearing reference face, the same bellow)
ΔAmL: The variation of preferentially grouped average height from the guide bearing rolling surface to the mounting reference face
ΔBs: The deviation of width of guide bearing
ΔB1s: The deviation of width of the mounting side-ear of needle roller bearing
ΔJs: The distance between two mounting holes in axial needle roller (roller) direction of guide bearing
ΔJ1s: The deviation of the distance between two mounting holes in motion direction of guide bearing
ΔL1s: The deviation of length of the mounting side-ear of needle roller bearing
ΔTs: The deviation of height of guide bearing
ΔT1s: The deviation of distance from the mounting hole axis of roller bearing to the bearing reference face
Δδs: The deviation of distance of needle roller (roller) protruding out of the housing of guide bearing
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Designation Methods
5 Boundary Dimensions
6 Technical Requirements
6.1 Material
6.2 Tolerance of guide bearing
6.3 Surface Roughness
6.4 Appearance Quality
6.5 Flexibility
6.6 Interchangeability
7 Test Methods
7.1 Surface Roughness
7.2 Measurement of ΔAs, ΔAmL and VAmL
7.3 Measurement of VAs
8 Inspection Rules
9 Marking
10 Rust Prevention, Packaging and Storage
Figure 1 Block Type Recirculating Needle Roller Bearing LNS...RN Type
Figure 2 Recirculating Groove Needle Roller Bearing with Drawn Housing LNS...GRN Type
Figure 3 Recirculating Groove Needle Roller Bearing with End Head LNS...GRNU Type
Figure 4 Recirculating Roller Bearing with Radial Mounting Hole LRS...SG Type
Figure 5 Recirculating Roller Bearing with Axial Mounting Hole LRS...SGK Type
Figure 6 Diagram of Measurement Principle
Table 1 LNS...RN Type
Table 2 LNS...GRN Type
Table 3 LNS...GRNU Type
Table 4 LRS...SG and LRS...SGK Types
Table 5 Tolerances of Guide Bearings
Table 6 Inspection Items
