Ningbo Tianyu Machinery Equipment Co., Ltd.
31
2026
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03
Vacuum Filling vs Manual Filling: What’s the Difference in NVH Component Production?
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In the production of hydraulic bushings and engine mounts, filling damping fluid into internal chambers is a critical process that directly affects NVH performance.
Two main methods are commonly used:
- manual filling
- vacuum filling
While manual filling may appear simple, it often cannot meet the consistency requirements of modern automotive production.
Vacuum filling systems provide a more controlled and reliable solution.
Manual Filling Method
Manual filling typically involves injecting fluid into the component under atmospheric conditions.
This method has several limitations:
- air remains trapped inside internal cavities
- inconsistent fluid volume between parts
- limited process repeatability
For simple products, manual filling may be sufficient. However, for complex hydraulic mounts, it introduces significant risks.
Vacuum Filling Method
Vacuum filling machines evacuate air from the component before injecting fluid.
The process usually includes:
- vacuum evacuation
- fluid injection under vacuum
- sealing and leak verification
Vacuum levels of ≤100 Pa are commonly used to ensure complete fluid saturation.
Key Differences
Air Removal
Manual filling cannot fully eliminate trapped air.
Vacuum filling removes air from internal cavities, ensuring complete fluid filling.
Consistency
Manual filling results in variation between products.
Vacuum filling provides stable and repeatable filling conditions.
Product Performance
Air bubbles affect damping characteristics and NVH performance.
Vacuum-filled components show more consistent dynamic behavior.
Production Efficiency
Manual filling requires more labor and time.
Vacuum filling systems can be automated for high-volume production.
When to Use Vacuum Filling
Vacuum filling is recommended when:
- products have complex internal structures
- NVH performance requirements are strict
- production volume is high
- quality traceability is required
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