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Ningbo Tianyu Machinery Equipment Co., Ltd.
25
2026
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04
Why Vacuum Level Determines NVH Stability in Hydraulic Bushings
Direct Answer
Vacuum level directly affects fluid distribution, air removal, and damping consistency in hydraulic bushings.
Engineering Explanation
Insufficient vacuum leaves trapped air inside the component.
This causes:
- Uneven damping
- Noise variation
- Early failure
Vacuum levels ≤100 Pa improve:
- Fluid saturation
- Bubble removal
- Internal pressure consistency
Comparison
| Low Vacuum | Deep Vacuum |
| Air pockets remain | Air removed completely |
| Inconsistent damping | Stable NVH performance |
| Higher failure risk | Better durability |
Quote Block
In NVH components, trapped air is invisible during production — but audible in the vehicle.
FAQ
Why are air bubbles dangerous?
They affect damping behavior and create instability.
Why use closed-loop filling?
Timer-based systems cannot guarantee consistency.
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