Rolling bearings - Boundary dimensions general plan - Part 1: Tapered roller bearings
1 Scope
This document specifies bearing and subunit boundary dimensions for complete single-row and double-row tapered roller bearings. It also specifies the flange dimensions of flanged outer rings for a selection of these bearings. A series designation for each bearing is also specified.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 492 Rolling bearings - Radial bearings - Geometrical Product Specifications (GPS) and tolerance values
Note: GB/T 307.1-2017 Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values (ISO 492: 2014, IDT)
ISO 582 Rolling bearings - Chamfer dimensions - Maximum values
Note: GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values (ISO 582: 1995,MOD)
ISO 1132-1 Rolling bearings - Tolerances - Part 1: Terms and definitions
Note: GB/T 4199-2003 Rolling Bearing - Tolerances - Definitions (ISO 1132-1: 2000, MOD)
ISO 5593 Rolling bearings - Vocabulary
Note: GB/T 6930-2002 Rolling bearings - Vocabulary (ISO 5593: 2019, IDT)
ISO 15241 Rolling bearings - Symbols for physical quantities
Note: GB/T 7811-2015 Rolling bearings - Symbols for physical quantities (ISO 15241: 2012, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1132-1 and ISO 5593 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
——ISO Online browsing platform: available at https://www.iso.org/obp;
——IEC Electropedia: available at http://www.electropedia.org/.
4 Symbols
For the purposes of this document, the symbols given in ISO 15241 and the following apply.
The symbols shown in Figures 1 to 4 and the values given in Tables 4 to 16 denote nominal dimensions unless specified otherwise.
B: inner ring width, single-row bearing
B1: overall width of inner rings of double-row tapered roller bearing or matched pair of tapered roller bearings with spacer
C: outer ring width, single-row bearing
C1: width of outer ring flange
C2: width of double outer ring, or overall width of outer rings of matched pair of tapered roller bearings with spacers
D: outside diameter of outer ring
D1: outside diameter of outer ring flange
d:: bore diameter of inner ring
E: inside diameter of outer ring back face
h1: height of outer ring flange
r: chamfer dimension of inner ring back face
rs min: smallest single chamfer dimension of inner ring back face
r1: chamfer dimension of outer ring back face
r1s min: smallest single chamfer dimension of outer ring back face
r2: chamfer dimension of inner ring and outer ring front face
T: bearing width, single-row bearing or nominal width, complete flange bearings
α: contact angle
Note: In the case of tapered roller bearings, the contact angle is the same as the half included outer ring raceway angle.
Figure 1 Single-row tapered roller bearing
Note: The double-row bearing outer ring can have a lubrication groove and holes.
Figure 2 Double-row tapered roller bearing with double raceway outer ring
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Series designations
6 Boundary dimensions
Annex A (Informative) Flange dimensions for additional outer ring sizes
Bibliography
Rolling bearings - Boundary dimensions general plan - Part 1: Tapered roller bearings
1 Scope
This document specifies bearing and subunit boundary dimensions for complete single-row and double-row tapered roller bearings. It also specifies the flange dimensions of flanged outer rings for a selection of these bearings. A series designation for each bearing is also specified.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 492 Rolling bearings - Radial bearings - Geometrical Product Specifications (GPS) and tolerance values
Note: GB/T 307.1-2017 Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values (ISO 492: 2014, IDT)
ISO 582 Rolling bearings - Chamfer dimensions - Maximum values
Note: GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values (ISO 582: 1995,MOD)
ISO 1132-1 Rolling bearings - Tolerances - Part 1: Terms and definitions
Note: GB/T 4199-2003 Rolling Bearing - Tolerances - Definitions (ISO 1132-1: 2000, MOD)
ISO 5593 Rolling bearings - Vocabulary
Note: GB/T 6930-2002 Rolling bearings - Vocabulary (ISO 5593: 2019, IDT)
ISO 15241 Rolling bearings - Symbols for physical quantities
Note: GB/T 7811-2015 Rolling bearings - Symbols for physical quantities (ISO 15241: 2012, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1132-1 and ISO 5593 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
——ISO Online browsing platform: available at https://www.iso.org/obp;
——IEC Electropedia: available at http://www.electropedia.org/.
4 Symbols
For the purposes of this document, the symbols given in ISO 15241 and the following apply.
The symbols shown in Figures 1 to 4 and the values given in Tables 4 to 16 denote nominal dimensions unless specified otherwise.
B: inner ring width, single-row bearing
B1: overall width of inner rings of double-row tapered roller bearing or matched pair of tapered roller bearings with spacer
C: outer ring width, single-row bearing
C1: width of outer ring flange
C2: width of double outer ring, or overall width of outer rings of matched pair of tapered roller bearings with spacers
D: outside diameter of outer ring
D1: outside diameter of outer ring flange
d:: bore diameter of inner ring
E: inside diameter of outer ring back face
h1: height of outer ring flange
r: chamfer dimension of inner ring back face
rs min: smallest single chamfer dimension of inner ring back face
r1: chamfer dimension of outer ring back face
r1s min: smallest single chamfer dimension of outer ring back face
r2: chamfer dimension of inner ring and outer ring front face
T: bearing width, single-row bearing or nominal width, complete flange bearings
α: contact angle
Note: In the case of tapered roller bearings, the contact angle is the same as the half included outer ring raceway angle.
Figure 1 Single-row tapered roller bearing
Note: The double-row bearing outer ring can have a lubrication groove and holes.
Figure 2 Double-row tapered roller bearing with double raceway outer ring
Contents of GB/T 273.1-2023
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Series designations
6 Boundary dimensions
Annex A (Informative) Flange dimensions for additional outer ring sizes
Bibliography
