GB/T 6931.2-2020 in English
VALIDBelt drives—Vocabulary—Part 2：V-belts and V-ribbed belt drives
- Issued on:2020-03-31
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$466.00
《GB/T 6931.2-2020带传动 术语 第2部分：V带和多楔带传动》由TC428（全国带轮与带标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Standard Evolution and Scope of Application
GB/T6931.2-2020 replaces the 2008 version of the standard. The main technical changes include:
- Symbol system optimization: unified V-belt section width, top width and other 12 parameter symbols
- Added 5 new term definitions such as elastic belt, free length
- Deleted basic terms already covered by GB/T6931.1
Core Terminology System
V-Belt Parameter Definition
| Terms | Symbols | Definition Points |
|---|---|---|
| Section width | Wp | The circumferential width of the belt that maintains its original length when it is bent |
| Relative height | T/Wp | Typical values such as 0.9 for narrow V-belts and 0.7 for ordinary V-belts |
| Benchmark length | Ld | Benchmark diameter circumference of the pulley measured under specified tension |
Key features of pulleys
Key Technical Differences between the New and Old Standards
| Project | 2008 Edition | 2020 Edition | Modification Type |
|---|---|---|---|
| Terms for Multi-V Belts | 6.1.1 Separate Definition | Integrated into the Unified Terminology System | Structural Adjustment |
| Symbol System | The symbol for section width is bp | Unified to Wp | Technical modification |
| Chart specification | No outer diameter diagram | Added Figure 15 to illustrate the top profile of the wheel groove | Complete supplement |
Typical application scenarios
Automotive transmission system
Special attention should be paid when using automotive V-belts(C.2.9):
- The reference length tolerance is controlled within ±0.8%
- The key impact of effective line difference compensation on multi-axis transmission
Industrial equipment selection
Application of combined V-belts (C.2.5) in mining machinery:
- Simultaneous verification of section width consistency and wedge spacing tolerance is required
- Dynamic modulus requirement ≥50N/mm
Implementation suggestions
- New design projects should adopt the 2020 version of the symbol system
- Multi-V belt transmission requires additional testing of the elongation parameter
- Drawings during the transition period must indicate the adopted terminology standard version
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