1 Scope
This standard specifies the structural type, dimensions and specifications of combined needle roller bearings with double direction thrust roller bearings (hereinafter referred to as “combined bearings”).
This standard is applicable to the combined bearings production and inspection by bearing manufacturer and finished combined bearings selection and acceptance by customers.
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 corrections 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 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 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 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 3573-2004 Rolling Bearings-Methods for the Measurement of Radial Internal Clearance
JB/T 3574-1997 Rolling Bearings-Marking for Products
JB/T 6641-2007 Rolling Bearings-Residual Magnetism and Its Assessment Method
JB/T 7051-2006 Rolling Bearing Parts-Methods for the Measurement and Assessment of Surface Roughness
3 Symbols
For the purpose of this standard, the following terms and definitions as well as those specified in GB/T 4199 apply.
C: the nominal width of outer ring;
C1: the nominal width of outer ring step;
C2: the distance from the outer ring face to the center line of radial oil hole;
D: the nominal outside diameter of outer ring of combined bearing;
D1: the nominal outside diameter of shaft washer of combined bearing;
D2: the nominal outside diameter of stepped shaft of stepped shaft washer of combined bearing;
D3: the nominal outside diameter of stepped shaft washer of combined bearing;
d: the nominal bore diameter of inner ring;
d1: the nominal bore diameter of shaft washer;
di: the oil hole diameter;
dm: the diameter of bolt hole;
J: the center circle diameter of oil hole and bolt hole;
r: the nominal chamfer dimension of shaft washer;
r1: the nominal chamfer dimension of outer ring;
rsmin: the smallest single chamfer dimension of r;
r1smin: the smallest single chamfer dimension of r1;
Sia: the axial runout of combined bearing;
T: the nominal height of combined bearing;
T1: the distance from outer ring face to the bottom surface of shaft washer;
T2: the nominal height of shaft washer;
T3: the nominal height of stepped shaft washer;
T4: the nominal height of stepped shaft of stepped shaft washer;
VCs: the variation of outer ring width;
ΔD1mp: the deviation of mean outside diameter in a single plane of shaft washer;
ΔD2mp: the deviation of mean outside diameter in a single plane of stepped shaft of stepped shaft washer;
ΔD3mp: the deviation of mean outside diameter in a single plane of stepped shaft washer;
Δd1mp: the deviation of mean bore diameter in a single plane of shaft washer.
4 Structural Types (See Figure 1 ~ Figure 4)
Contents
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Structural Types
5 Dimensions
6 Technical Requirements
6.1 Materials and Heat Treatment
6.2 Tolerance
6.3 Surface Roughness
6.4 Internal Clearance
6.5 Residual Magnetism
6.6 Appearance Quality
6.7 Interchangeability
6.8 Miscellaneous
7 Measurement Methods
8 Inspection Rules
9 Marking
10 Rust Prevention and Packaging
Appendix A (Normative) Measurement Methods for ΔTs, Sia, Kia, Kea and Sd
A.1 Measurement of Deviation ΔTs of Actual Height of Combined Bearings
A.2 Measurement of Axial Runout Sia of Combined Bearings
A.3 Measurement of Radial Runout Kia of Inner Ring of Combined Bearings
A.4 Measurement of Radial Runout Kea of Outer Ring of Combined Bearings
A.5 Measurement of Verticality Sd of Inner Ring Face to Bore
Figure 1 Combined Needle Roller Bearings with Double Direction Thrust Roller Bearings ZARN Type
Figure 2 Combined Needle Roller Bearings with Double Direction Thrust Roller Bearings with Flange Plate ZARF Type
Figure 3 Combined Needle Roller Bearings with Double Direction Thrust Roller Bearings with Elongated Stepped Shaft Washer ZARN…L Type
Figure 4 Combined Needle Roller Bearings with Double Direction Thrust Roller Bearings with Elongated Stepped Shaft Washer and Flange Plate ZARF…L Type
Table 1 ZARN Type Light Series
Table 2 ZARN…L Type Light Series
Table 3 ZARF Type Light Series
Table 4 ZARF…L Type Light Series
Table 5 ZARN Type Heavy Series
Table 6 ZARN…L Type Heavy Series
Table 7 ZARF Type Heavy Series
Table 8 ZARF…L Type Heavy Series
Table 9 Inner Ring
Table 10 Outer Ring
Table 11 Shaft Washer
