1. Classification of rolling bearings

(GB/T271-1997)

1 Scope

This standard specifies the classification of rolling bearings

This standard applies to the classification management of rolling bearing products.

2 Reference standards

The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest edition of the following standards.

GB/T 276-94 Rolling Bearing Deep Groove Ball Bearing Dimensions

GB/T 281-94 Rolling Bearing Self-aligning Ball Bearing Dimensions

GB/T 283-94 Rolling Bearing Cylindrical Roller Bearing Dimensions

GB/T 285-94 Rolling Bearing Double Row Cylindrical Roller Bearing Dimensions

GB/T 288-94 Rolling Bearing Spherical Roller Bearing Dimensions

GB 290-89 Rolling Bearing Drawn Cup Needle Roller Bearing Dimensions

GB/T 292-94 Rolling Bearing Angular Contact Ball Bearing Dimensions

GB/T 294-94 Rolling bearing three-point and four-point contact ball bearing dimensions

GB/T 296-94 Rolling Bearing Double Row Angular Contact Ball Bearing Dimensions

GB/T 297-94 Rolling Bearing Tapered Roller Bearing Dimensions

GB/T 299-1995 Rolling Bearing Double Row Tapered Roller Bearing Dimensions

GB/T 300-1995 Rolling Bearing Four Row Tapered Roller Bearing Dimensions

GB/T 301-1995 Rolling Bearing Thrust Ball Bearing Dimensions

GB/T 3882-1995 Rolling Bearing Outer Spherical Ball Bearing Dimensions

GB/T 4663-94 Rolling Bearing Thrust Cylindrical Roller Bearing Dimensions

GB/T 5801-94 Rolling Bearing Light and Medium Series Needle Roller Bearing Dimensions and Tolerances

GB/T 5859-94 Rolling Bearing Thrust Spherical Roller Bearing Dimensions

GB/T 6445.1-1996 Roller Bearing Roller Needle Bearing Dimensions

GB 6930-86 Rolling Bearing Vocabulary

JB 3122-91 Rolling Bearing Needle Roller and Thrust Ball Combined Bearing Dimensions

JB 3123-91 Rolling Bearing Needle Roller and Angular Contact Ball Combined Bearing Dimensions

JB/T 6362-95 Rolling bearing machine tool spindle with bidirectional thrust angular contact ball bearing

Dimensions and tolerances of JB/T 6644-93 rolling bearing needle roller and bidirectional thrust cylindrical roller combined bearing

JB/T 7915-95 rolling bearing thrust needle roller and cage assembly, thrust washer

JB/T 7918-95 Needle Roller Bearing Radial Needle Roller and Cage Assembly

Dimensions of ZB J11 011-87 Rolling Bearing Needle Roller and Thrust Cylindrical Roller Combined Bearings

3 Definitions

Bearing terms and definitions in this standard are in accordance with the provisions of GB 6930.

4 Classification of rolling bearing structure types

4.1 Bearings are classified into:

a) Radial bearing - mainly used for rolling bearing bearing radial load, its nominal contact angle is from 0 to 45. According to the nominal contact angle, it is divided into:

1) Radial contact bearing - radial bearing with a nominal contact angle of 0;

2) Angular contact radial bearings - bearings with a nominal contact angle greater than 0 to 45.

b) Thrust bearing - mainly used for rolling bearing bearing axial load, its nominal contact angle is greater than 45 to 90. According to the difference of the nominal contact angle, it is divided into:

1) Axial contact bearing—thrust bearing with a nominal contact angle of 90;

2) Angular contact thrust bearing—thrust bearing with a nominal contact angle greater than 45 but less than 90;

4.2 Bearings are divided into:

a) Ball bearings - the rolling elements are balls;

b) Roller bearings - the rolling elements are rollers.

Roller bearings are divided into:

1) Cylindrical roller bearings - bearings whose rolling elements are cylindrical rollers;

2) Needle roller bearing - the rolling element is a needle roller bearing;

3) Tapered roller bearings - bearings whose rolling elements are tapered rollers;

4) Spherical roller bearings - the rolling elements are spherical roller bearings.

4.3 Bearings are divided into:

a) Self-aligning bearing - the raceway is spherical, which can adapt to the angular deviation and angular motion between the axis lines of the two raceways;

b) Non-aligning bearing (rigid bearing) - a bearing that can resist the angular deviation of the axis line between the raceways.

4.4 Bearings are divided into:

a) Single row bearings - bearings with one row of rolling elements;

b) Double row bearings - bearings with two rows of rolling elements;

c) Multi-row bearings - bearings with more than two rows of rolling elements and bearing loads in the same direction. Such as: three-row, four-row bearings.

4.5 Bearings are divided into:

a) Separable Bearings - Bearings with separable parts;

b) Non-separable bearing - a bearing in which the rings cannot be freely separated after the bearing is finally assembled.

4.6 Bearings can also be divided into various structural types according to their structural shapes (such as: with or without filling grooves, with or without inner and outer rings, the shape of the ferrule, the structure of the rib, and even with or without a cage, etc.).

See Appendix A for the classification of commonly used bearing structure types.

The bearing is listed in Appendix B according to the comprehensive classification structure diagram of the bearing load direction or nominal contact angle and the type of rolling element.

5 Rolling bearing size classification

Bearings are divided into:

a) Miniature bearings - bearings with a nominal outer diameter range of less than 26mm;

b) Small bearings - bearings with a nominal outer diameter ranging from 28 to 55 mm;

c) Small and medium-sized bearings—bearings with a nominal outer diameter ranging from 60 to 115 mm;

d) Medium and large bearings - bearings with a nominal outer diameter ranging from 120 to 190 mm;

e) Large bearings - bearings with a nominal outer diameter ranging from 200 to 430 mm;

f) Extra large bearings - bearings with a nominal outer diameter range of 430mm or more.