Rolling bearings - Cylindrical roller bearings - Boundary dimensions
1 Scope
This document specifies the boundary dimensions of cylindrical roller bearings and cylindrical roller bearings without inner and outer rings in accordance with GB/T 273.3-2020.
This document is applicable to the design and user selection of cylindrical roller bearings.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 272-2017 Rolling bearings - Identification code
GB/T 274-2000 Rolling bearings - Chamfer dimension - Maximum values
GB/T 6930-2002 Rolling bearings - Vocabulary
GB/T 20060-2011 Rolling bearings - Cylindrical roller bearings, separate thrust collars - Boundary dimensions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6930-2002 apply.
4 Symbols
For the purposes of this document, the following symbols apply.
The symbols shown in Figures 1 to 8 and the values given in Tables 1 to 10 and Annex A Tables A.1 to A.9 denote nominal dimensions unless specified otherwise.
Note: Figures 1 to 8 are schematic diagrams only and do not show all structural details. There are many variations of cylindrical roller bearings.
a——rib width;
B——bearing width;
B1——width of thrust collar protruding beyond inner ring face;
D——bearing outside diameter;
d——bearing bore diameter;
Ew——outside diameter of roller set;
Fw——bore diameter of roller set;
r——chamfer dimensions of inner and outer rings of bearings;
rsmin——minimum single size of r;
r1——chamfer dimensions of narrow end faces of inner and outer rings (ribs) of bearings;
r1smin——minimum single size of r1.
Figure 1 NU type cylindrical roller bearing with non-rib inner ring
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Code
6 Mark
7 Boundary dimensions
Annex A (Normative) Boundary dimensions of non-reinforced cylindrical roller bearings
Bibliography
