GB/T 273.2-2018Rolling bearings -- Boundary dimensions, general plan -- Part 2: Thrust bearings (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
July 13, 2018
Implementation date
May 1, 2019
Scope
GB/T 273.2-2018 (Rolling bearings -- Boundary dimensions, general plan -- Part 2: Thrust bearings) is available as an English-translated PDF.
GB/T 273.2-2018 — This part of GB/T 273 specifies the preferred dimensions of one-way and two-way flat-bottom thrust bearings. In addition, this section also specifies the minimum inner diameter of the race and the maximum outer diameter of the collar for the size series of 11, 12, 13, 14, 22, 23 and 24 bearings. size. This section also specifies the extension rules for the overall dimensions of the one-way thrust bearing dimensions, see Appendix A. Note. For the dimensions of the self-aligning thrust bearing (non-flat bottom) and the aligning seat washer, see ISO 20516 [2].
Document preview — GB/T 273.2-2018
National Standard of the People's Republic of China
- ICS
- 21.100.20
- Classification
- J 11
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 symbol
- 5 dimensions
- 5.1 General
- 5.2 one-way flat bottom thrust bearing
- 5.3 two-way flat bottom thrust bearing
Foreword
GB/T 273 "Rolling bearing dimensions overall plan" is divided into three parts.
---Part 1. Tapered roller bearings;
---Part 2. Thrust bearings;
--- Part 3. Radial bearings.
This part is the second part of GB/T 273.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 273.2-2006 "General plan for the dimensions of rolling bearing thrust bearings", and GB/T 273.2-2006
In contrast to the editorial changes, the main technical changes are as follows.
--- Added the definition of one-way flat-bottom thrust bearing, two-way flat-bottom thrust bearing and central shaft ring (see Chapter 3);
--- Modified the definition of some symbols (see Chapter 4, Chapter 4 of the.2006 edition);
--- Adjusted the position of Figure 1 and Figure 2 in the standard (see Chapter 4, 5.2 and 5.3 of the.2006 edition);
--- Removed the provisions for chamfering contours (see 5.1 of the.2006 edition);
--- Added a description of the unit of measurement for each of the formulas (A.1) and (A.2) (see A.3, A.4).
This part uses the translation method equivalent to ISO 104.2015 "Rolling bearing thrust bearing size overall plan".
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows.
---GB/T 274-2000 Rolling bearing chamfer size maximum (idtISO 582.1995)
---GB/T 6930-2002 Rolling Bearing Vocabulary (ISO 5593.1997, IDT)
---GB/T 7811-2015 Rolling bearing parameter symbol (ISO 15241.2012, IDT)
This section also made the following editorial changes.
--- Revised the standard name, the standard name was changed to "Rolling bearing dimensions overall plan part 2. thrust bearing".
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Rolling Bearing Standardization Technical Committee (SAC/TC98).
This section drafted by. Luoyang Bearing Research Institute Co., Ltd., Zhangzhou Meiya Special Bearing Factory, Hefei Jinchang Bearing Co., Ltd., Zhejiang
High-speed Rail Bearing Co., Ltd., Shandong Jinna Machinery Engineering Technology Co., Ltd.
1 Scope
This part of GB/T 273 specifies the preferred dimensions of one-way and two-way flat-bottom thrust bearings.
In addition, this section also specifies the minimum inner diameter of the race and the maximum outer diameter of the collar for the size series of 11, 12, 13, 14, 22, 23 and 24 bearings.
size.
This section also specifies the extension rules for the overall dimensions of the one-way thrust bearing dimensions, see Appendix A.
Note. For the dimensions of the self-aligning thrust bearing (non-flat bottom) and the aligning seat washer, see ISO 20516 [2].
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
ISO 582 rolling bearing chamfer size maximum (Rolingbearings-Chamferdimensions-Maximumval-
Ues)
ISO 5593 Rolling Bearing Vocabulary (Rolingbearings-Vocabulary)
ISO 15241 rolling bearing parameter symbols (Rolingbearings-Symbolsforphysicalquantities)
3 Terms and definitions
The following terms and definitions defined by ISO 5593 apply to this document.
3.1
One-way flat-bottom thrust bearing single-directionthrustbearingwithflatbackfaces
It is only used for flat-bottomed thrust bearings that can withstand axial loads in one direction.
3.2
Two-way flat-bottom thrust bearing double-directionthrustbearingwithflatbackfaces
Flat-bottomed thrust bearing for axial loads in both directions.
3.3
Central shaft centralshaftwasher
The middle ring mounted on the shaft.
[ISO 20516.2007, definition 3.5]
4 symbol
The symbols given in ISO 15241 and the following symbols apply to this document.
Unless otherwise indicated, the symbols shown in Figures 1 and 2 and the values shown in Tables 1 through 9 all indicate nominal dimensions.
B. the height of the middle ring
D. outer diameter of the seat
D1. inner diameter of the seat
D1smin. the smallest single inner diameter of the seat
d. one-way flat-bottom thrust bearing shaft inner diameter
D1. one-way flat-bottom thrust bearing shaft outer diameter
D1smax. the largest single outer diameter of the shaft
D2. inner diameter of the shaft in the two-way flat-bottom thrust bearing
D3. outer diameter of the shaft ring of the two-way flat-bottom thrust bearing
D3smax. the largest single outer diameter of the central shaft
r. shaft ring and seat back chamfer size
Rsmin. minimum single chamfer size on the back of the collar and race
R1. middle shaft ring end chamfer size
R1smin. minimum single chamfer size for the end face of the shaft collar
T. one-way flat-bottom thrust bearing height
T1. two-way flat-bottom thrust bearing height
Fig.1 One-way flat-bottom thrust bearingFig.2 Two-way flat-bottom thrust bearing
5 dimensions
5.1 General
The maximum single chamfer size corresponding to rsmin in Tables 1 to 9 and r1smin in Tables 7 to 9 is specified in ISO 582.
The chamfer dimensions r and r1 apply only to the chamfers indicated in Figures 1 and 2, and the other chamfers are not sized, but should not be acute.
5.2 one-way flat bottom thrust bearing
The dimensions of the one-way flat-bottom thrust bearing are shown in Tables 1 to 6.
Table 1 One-way thrust bearing---diameter series 0 unit is mm
d D rsmin
Size series
d D rsmin
Size series
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.5
1.5
1.5
1.5
1.5
2.1
2.1
2.1
2.1
Table 2 One-way thrust bearing---diameter series 1 unit is mm
d D rsmin
Size series
T d1smax D1smin
d D rsmin
Size series
T d1smax D1smin
0.3
0.3
0.3
0.3
0.3
0.6
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.1
1.5
1.5
1.5
2.1
2.1
2.1
2.1
7.5
7.5
7.5
7.5
7.5
9.5
9.5
9.5
Table 3 One-way thrust bearing---diameter series 2 units in millimeters
d D rsmin
Size series
T d1smax D1smin
d D rsmin
Size series
T d1smax D1smin
0.3
0.3
0.3
0.6
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.5
1.5
1.5
1.5
1.5
1.5
2.1
2.1
2.1
7.5
7.5
7.5
7.5
9.5
9.5
9.5
9.5
9.5
9.5
Table 4 One-way thrust bearing---diameter series 3 units in millimeters
d D rsmin
Size series
T d1smax D1smin
d D rsmin
Size series
T d1smax D1smin
0.6
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.1
1.5
1.5
1.5
1.5
1.5
2.1
2.1
2.1
2.1
7.5
7.5
7.5
9.5
9.5
9.5
9.5
9.5
Table 5 One-way thrust bearing---diameter series 4 units in millimeters
d D rsmin
Size series
T d1smax D1smin
d D rsmin
Size series
T d1smax D1smin
1.1
1.1
1.1
1.5
1.5
1.5
2.1
2.1
2.1
7.5
7.5
7.5
7.5
7.5
7.5
9.5
9.5
9.5
9.5
9.5
Table 6 One-way thrust bearing---diameter series 5 units in millimeters
d D rsmin
Size series
d D rsmin
Size series
1.1
1.1
1.1
1.5
2.1
2.1
2.1
7.5
7.5
7.5
9.5
9.5
9.5
9.5
5.3 two-way flat bottom thrust bearing
The dimensions of the two-way flat-bottom thrust bearing are shown in Tables 7 to 9.
Table 7 Two-way thrust bearing---diameter series 2---size series 22 units in millimeters
D2 da D rsmin r1smin T1 B d3smax D1smin
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.5
1.5
1.5
1.5
1.5
1.5
0.3
0.3
0.3
0.3
0.3
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.1
1.1
189.5
199.5
214.5
224.5
239.5
Ad is the inner diameter of the collar of the corresponding diameter series 2 one-way bearing in Table 3.
Table 8 Bidirectional Thrust Bearings---Diameter Series 3---Series Series 23 Units in millimeters
D2 da D rsmin r1smin T1 B d3smax D1smin
1.1
1.1
1.1
1.1
1.1
1.5
1.5
1.5
1.5
1.5
2.1
2.1
2.1
2.1
0.3
0.3
0.3
0.6
0.6
0.6
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.1
1.1
189.5
209.5
Ad is the inner diameter of the collar of the corresponding diameter series 3 one-way bearing in Table 4.
Table 9 Directional thrust bearing---diameter series 4---size series 24 units in millimeters
D2 da D rsmin r1smin T1 B d3smax D1smin
1.1
1.1
1.1
0.6
0.6
0.6
0.6
0.6
1.5
1.5
1.5
2.1
2.1
2.1
0.6
0.6
0.6
1.1
1.1
1.1
1.1
1.5
2.1
179.5
189.5
209.5
Ad is the inner diameter of the collar of the corresponding diameter series 4 one-way bearing in Table 5.
Appendix A
(informative appendix)
Extension rules for the overall plan size of one-way thrust bearings
A.1 General
For any new dimensions not specified in this section, the following rules should be followed. However, the formula for calculating the outer diameter and height values
It should not be used as the sole basis for finalizing the form factor value. In order to maintain the continuity of this part, to obtain the appropriate bearing ratio and adoption
Priority size, the calculated dimensions should be properly corrected.
Therefore, any new size should be recognized by the National Rolling Bearing Standardization Technical Committee.
A.2 inner diameter
The inner diameter d of the collar larger than 500 mm should be selected from the R40 priority number system of ISO 3 [1].
The inner diameter of the collar that has appeared in this section should be preferred.
A.3 outer diameter
The outer diameter of the seat circle D is calculated according to formula (A.1).
D =d fDd0.8 (A.1)
In the formula.
D --- the number of millimeters of the outer diameter of the seat, in millimeters (mm);
d --- the number of millimeters of the inner diameter of the collar, in millimeters (mm);
fD --- coefficient, the value of which is selected according to Table A.1.
Table A.1 fD values
Diameter series 0 1 2 3 4 5
fD 0.36 0.72 1.2 1.84 2.68 3.8
The outer diameter of the race that has appeared in this section should be preferred. The new outer diameter dimensions shall be rounded in accordance with Table A.2.
Table A.2 The rounding unit of D is mm
> <=
Round to the nearest value
0.5
A.4 bearing height
The bearing height T is calculated according to formula (A.2) and its unit is mm.
T=fT
Dd
(A.2)
In the formula.
D --- the number of millimeters of the outer diameter of the seat, in millimeters (mm);
d --- the number of millimeters of the inner diameter of the collar, in millimeters (mm);
fT --- coefficient, the value is selected according to Table A.3.
Table A.3 fT values
Height series 7 9 1
fT 0.9 1.2 1.6
The new height dimensions should be rounded according to Table A.4.
Table A.4 The rounding unit of T is mm
> <=
Round to the nearest value
0.1
0.5
A.5 minimum single chamfer size
The minimum single chamfer size rsmin should be selected from the rsmin values listed in ISO 582. In principle, the value is closest to but not greater than the bearing.
7% of height T and section width D-d2
The smaller of the 7% of the two values.
references
[1] ISO 3 Preferrednumbers-Seriesofpreferrednumbers
[2] ISO 20516 Rolingbearings-Aligningthrustbalbearingsandaligningseatwashers-
Boundarydimensions
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.
Referenced standards
Normative references
ISO 582 · ISO 5593 · ISO 15241
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