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JB/T 2300-2018Slewing bearings (English PDF)

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

July 4, 2018

Implementation date

May 1, 2019

Scope

JB/T 2300-2018 is the English-translated version of 回转支承.

JB/T 2300-2018 is the Chinese standard "Slewing bearings". Its scope clause reads: This standard specifies the symbols, classification and designation, requirements, testing methods, inspection rules, marking, packaging, transportation and storage of slewing bearings.

This standard is applicable to slewing bearings for engineering machinery, mining machinery, port machinery, construction machinery and other machinery requiring relative slewing movement of two parts. Its clauses include symbols; classification and designation.

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Document preview — JB/T 2300-2018

National Standard of the People's Republic of China

ICS: 53.100
Replacing: JB/T 2300-2011

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword
1 Scope
2 Normative references
3 Symbols
4 Classification and designation
4.1 Type
4.2 Basic parameters
4.3 Marking
5 Requirements
5.1 Parts
5.2 Assembly
5.3 Selection calculation
5.4 Load-bearing capacity curve
5.5 Other requirements
6 Testing methods
6.1 Testing of parts
6.2 Measurement of assembly precision
7 Inspection rules
7.1 End-of-manufacturing inspection
7.2 Type inspection
7.3 Judgment rules
7.4 Other requirements
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation and storage
Annex A (Informative) Calculation method of slewing bearing selection
Annex B (Informative) Load-bearing capacity curve of slewing bearing
Bibliography

1 Scope

This standard specifies the symbols, classification and designation, requirements, testing methods, inspection rules, marking, packaging, transportation and storage of slewing bearings.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 308.1 Rolling bearings - Balls - Part 1: Steel balls

GB/T 699 Quality carbon structure steels

GB/T 1357 Cylindrical gears for general engineering and for heavy engineering - Modules

GB/T 3077 Alloy structure steels

GB/T 4661 Rolling bearings - Cylindrical rollers

GB/T 5617 Determination of effective depth of hardening after induction or flame hardening of steel

GB/T 6394 Determination of estimating the average grain size of metal

GB/T 10095.1-2008 Cylindrical gears - System of accuracy - Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth

GB/T 10095.2-2008 Cylindrical gears - System of accuracy - Part 2: Definitions and allowable values of deviations relevant to radial composite deviations and runout information

GB/Z 18620.1 Cylindrical gears - Code of inspection practice - Part 1: Inspection of corresponding flanks of gear teeth

GB/Z 18620.2 Cylindrical gears - Code of inspection practice - Part 2: Inspection related to radial composite deviations, runout, tooth thickness and backlash

HG/T 2349 Polyamide 1010 resin

HG/T 2811 Rubber material of rotary shaft lip seal ring

JB/T 5947 Engineering machinery - General technical specifications for packaging

JB/T 7940.7 Grease nipples and lubricating cups - Technical specification

3 Symbols

See Table 1 and Figure 1 for the appellation and symbol of each part of a slewing bearing.

Table 1 Appellation and symbol of each part

Symbol Appellation Symbol Appellation

DL Diameter of center circle of roller path (of upper row) d1 Inner diameter of outer ring

DW Diameter of rolling element (of upper row) D3 Inner diameter of inner ring

D1 Distribution diameter for mounting holes of outer ring H Total height

D2 Distribution diameter for mounting holes of inner ring H1 Height of inner/outer ring

D Nominal outer diameter h Height difference between two end faces of inner and outer rings d Nominal inner diameter DS Effective case depth n Number of mounting holes L Thread length of mounting threaded hole n1 Number of lubricating holes da Diameter of addendum circle dn1 Diameter of mounting unthreaded hole of outer ring m Module dn2 Diameter of mounting unthreaded hole of inner ring x Radial modification coefficient of gear dm1 Diameter of mounting threaded hole of outer ring z Number of teeth dm2 Diameter of mounting thread hole of inner ring b Width of tooth

Note: The outer ring in Figure a) is composed of an upper ring and a lower ring; the inner ring in Figure b) is composed of an upper ring and a lower ring.

Figure 1 Appellation and symbol of each part of a slewing bearing (taking a triple-row roller slewing bearing as an example)

4 Classification and designation

4.1 Type

4.1.1 Structural style

A slewing bearing is composed of rings (inner ring, outer ring and upper/lower ring), rolling elements, separators, sealing tapes, grease nipples/lubricating cups, etc., which are classified into four series by structural type:

a) single-row four-point contact ball slewing bearings (series 01), as shown in Figure 2;

b) double-row different-diameter ball slewing bearings (series 02), as shown in Figure 3, with the nominal diameter combination of rolling elements (of upper/lower row) as follows: 25/20, 30/25, 40/30, 50/40, 60/50;

c) single-row crossed roller slewing bearings (series 11), as shown in Figure 4, whose rolling elements are 1:1 cross arranged at 90°;

d) triple-row roller slewing bearings (series 13), as shown in Figure 5, whose nominal diameter combination of rolling elements is 25/20/16, 32/25/20, 40/32/25, 45/32/25 and 50/40/25.

Note: The mounting holes of inner and outer rings may be classified into unthreaded holes or threaded holes (this note also applies to Figures 3~5, the type of threaded holes is the same as that in Figure 2, with designation of DW omitted).

Figure 2 Single row four-point contact ball slewing bearings (series 01)

Figure 3 Double-row different-diameter ball slewing bearings (series 02)

Figure 4 Single-row crossed roller slewing bearings (series 11)

Figure 5 Triple-row roller slewing bearings (series 13)

4.1.2 Transmission types

Transmission types are classified into:

a) 0——toothless type;

b) 1——external teeth of involute cylindrical gear with a smaller meshing module;

c) 2——external teeth of involute cylindrical gear with a greater meshing module;

d) 3——internal teeth of involute cylindrical gear with a smaller meshing module;

e) 4——internal teeth of involute cylindrical gear with a greater meshing module.

4.1.3 Mounting fitting types

Mounting fitting types are classified into:

a) 0——standard type with no seam allowance;

b) 1——standard type with a seam allowance;

c) 2——special type.

4.1.4 Mounting hole types

Mounting hole types are classified into:

a) 0——both the mounting holes of inner and outer ring are unthreaded holes;

b) 1——both the mounting holes of inner and outer ring are threaded holes;

c) 2——the mounting holes of inner ring are threaded holes, and those of outer ring are unthreaded holes;

d) 3——the mounting holes of outer ring are threaded holes, and those of inner ring are unthreaded holes.

4.2 Basic parameters

4.2.1

See Table 2 for the basic parameters of single-row four-point contact ball slewing bearings.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

Editions of JB/T 2300

Edition	Title	Revision	Status
JB/T 2300-2018	Slewing bearings	current edition	Current
JB/T 2300-2011	Slewing bearings	previous edition	Superseded

This page sells the current edition, JB/T 2300-2018. Earlier editions are listed for reference only.

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