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GB/T 39271.2-2020Rolling bearings. Load ratings for hybrid bearings with rolling elements made of ceramic - Part 2: Static load ratings (English PDF)

滚动轴承陶瓷滚动体混合轴承的额定载荷第2部分：额定静载荷

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

November 19, 2020

Implementation date

June 1, 2021

Scope

GB/T 39271.2-2020 is the English-translated version of 滚动轴承陶瓷滚动体混合轴承的额定载荷第2部分：额定静载荷.

GB/T 39271.2-2020 is the Chinese standard "Rolling bearings. Load ratings for hybrid bearings with rolling elements made of ceramic - Part 2: Static load ratings".

Its scope clause reads: This part of GB/T 39271 stipulates that the bearing ring is made of contemporary high-quality hardened bearing steel and is made according to good processing methods.

The dynamic body is a calculation method for the static load rating of a hybrid bearing made of high-quality silicon nitride (Si3N4). ISO 3290-2[1] and ISO 26602[4] applies to ceramic balls; ISO 12297-2[2] and ISO 26602[4] apply to ceramic rollers.

When using hybrid bearings, see Table 1 and Table 2 for the reference value of static safety factor S0. Its clauses include terms and definitions.

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Document preview — GB/T 39271.2-2020

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

Foreword
Introduction
1 Scope
2 Normative references

1 Scope

This part of GB/T 39271 stipulates that the bearing ring is made of contemporary high-quality hardened bearing steel and is made according to good processing methods.

The dynamic body is a calculation method for the static load rating of a hybrid bearing made of high-quality silicon nitride (Si3N4). ISO 3290-2[1] and

ISO 26602[4] applies to ceramic balls; ISO 12297-2[2] and ISO 26602[4] apply to ceramic rollers.

When using hybrid bearings, see Table 1 and Table 2 for the reference value of static safety factor S0.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article

Pieces. For undated references, the latest version (including all amendments) applies to this document.

ISO 76.2006 Static load rating of rolling bearings

ISO 5593 rolling bearing vocabulary

3 Terms and definitions

The following terms and definitions defined by ISO 5593 and ISO 76 apply to this document.

The website of the terminology database used in the standardization work maintained by ISO and IEC is as follows.

3.1 Radial basic static load rating

The radial static load corresponding to the following calculated contact stress is generated at the contact center of the maximum load rolling element and the raceway.

---4600MPa radial ball bearings, including self-aligning ball bearings;

---4200MPa radial roller bearings.

Note 1.For single row angular contact ball bearings, the radial static load rating refers to the radial component of the load that causes a pure radial displacement between the bearing rings.

Note 2.The contact stress limit given in this definition is only valid for rolling elements made of silicon nitride with an elastic modulus of 300,000 MPa or higher.

For rolling elements made of ceramics with low elastic modulus, the contact stress limit in ISO 76 applies.

3.2 Axial basic static load rating

The center axial static load corresponding to the following calculated contact stress is generated at the contact center of the maximum load rolling element and the raceway.

---4600MPa thrust ball bearing;

---4200MPa thrust roller bearing.

Note 1.For tapered rollers, the applicable roller diameter is equal to the average of the imaginary theoretical sharp corner diameters at the large and small ends of the roller.

Note 2.For asymmetric spherical rollers, the applicable roller diameter is the approximate value of the diameter at the contact point of the roller and the raceway without ribs under zero load. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 76.2006 · ISO 5593

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