GB/T 39433-2020 in English
VALIDGas spring design calculation
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 39433-2020气弹簧设计计算》由TC235（全国弹簧标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Types of gas springs | Design focus | Calculation formula | Typical parameters |
|---|---|---|---|
| Compression gas spring | Extension force/compression force balance | F1=πD2P/4-Fr | Elastic force ratio α≤1.5 |
| Lockable gas spring | Valve core opening force design | Fk=πd12P/4+fr | fr=10-30N |
| Tension gas spring | Sectional difference compensation | F5=π(D2-d2)P/4+Fr | Safety stroke ≥5mm |
Key technical points
1. Mechanical parameter calculation system
The standard establishes a complete force calculation model, including 8 key force parameters:
- Extension force F1-2: consider dynamic friction compensation
- Compression force F3-4: derived based on Boyle's law
- Critical force FL: Euler formula is used when slenderness ratio >85
Application case: Automobile tailgate gas spring
A certain SUV model is supported by dual gas springs. According to the calculation of standard 7.2.1: when the mass of the tailgate is 15kg and the opening angle is 75°, a compression gas spring with a nominal force Fa=550N±5% is required. The measured force-displacement curve is consistent with that shown in Figure 9.
Implementation suggestions
Design verification process
- Determine initial parameters according to Appendix G
- Calculate rod diameter by formula (16)-(20)
- Perform stability check according to Appendix E
- Verify cylinder strength with reference to Table D.2
Avoidance of common problems
- Elastic force ratio exceeds standard: adjust the ratio of air cavity length L3 to cylinder diameter
- Piston rod vibration: ensure that the guide length meets the requirements of Table 2
- Low temperature failure: compensate the temperature coefficient at 0.37%/℃
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