GB/T 39271.2-2020 in English
VALIDRolling bearings—Load ratings for hybrid bearings with rolling elements made of ceramic—Part 2:Static load ratings
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | GB/T 39271.2-2020 |
| Document status: | VALID |
| Title in English: | Rolling bearings—Load ratings for hybrid bearings with rolling elements made of ceramic—Part 2:Static load ratings |
| Title in Chinese: | 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 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| ICS Classification: | 21.100.20-Rolling bearings |
| Professional Classification: | GB-National Standard |
| Related Keywords: | rolling bearings load ratings
hybrid bearings steel bearings ball bearings roller bearings |
| Related Topics: | Ball bearing load
load standard Forehead Cyclic Load Bearings roll fixed load charge Carrying capacity Static load ratings for rolling bearings scroll load standard GB/T 39271.2 GB/T 39271.2-2020 load Elevator rated load related Dynamic load industry testing Bearing load Roller mixer calibration static load Mixing rolling machine national standard |
《GB/T 39271.2-2020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》由TC98（全国滚动轴承标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
Static load rating calculation system
| Bearing type | Calculation formula | Contact stress limit (MPa) |
|---|---|---|
| Radial ball bearings | C0r=f0×i×Z×Dw2×cosα | 4600 |
| Thrust ball bearing | C0a=f0×Z×Dw2×sinα | 4600 |
| Radial roller bearing | C0r=41.5862×(1-γ)×i×Z×Lwe×Dwe×cosα | 4200 |
Key points of technological evolution
Material property correction
Formula for correction factor of difference in elastic modulus: w=(ESt/2(1-νSt2))×[(1-νSt2)/ESt + (1-νCe2)/ECe]
Improved safety factor
Compared with steel bearings, the static safety factor S0 of hybrid bearings is increased by 30-50%:
- Ball bearings under stable working conditions: 2.6 (steel 1.8)
- Roller bearings under impact working conditions: 3.3 (steel 2.5)
Implementation suggestions
Selection considerations
- Prioritize the use of Grade I/II ceramic materials that comply with ISO 26602 standard
- When Dwcosα/Dpw＞0.3, the calculation coefficient needs to be recalibrated
- The axial load condition needs to calculate the P0a equivalent static load separately
Special working condition processing
For ceramic materials with elastic modulus <300000MPa, the more stringent contact stress limit should be adopted in accordance with ISO 76 standard
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