Ningbo Tianyu Machinery Equipment Co., Ltd.
10
2026
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03
Why Vacuum Filling Is Required for Hydraulic Engine Mount Production
SEO Article
Hydraulic engine mounts are widely used in modern vehicles to reduce vibration transmitted from the engine to the chassis.
Unlike conventional rubber mounts, hydraulic mounts contain internal chambers filled with damping fluid. These chambers are connected through narrow channels that allow controlled fluid movement during vibration.
This hydraulic damping mechanism significantly improves vibration isolation across different frequency ranges.
To ensure proper performance, the damping chambers must be completely filled with fluid while eliminating trapped air.
This requirement makes vacuum filling technology essential in hydraulic mount manufacturing.
Problems Caused by Air Entrapment
If air remains inside the damping chambers during the filling process, several problems may occur.
Reduced Damping Performance
Air compressibility changes the hydraulic characteristics of the mount and reduces its damping effectiveness.
Inconsistent Product Behavior
Air bubbles can lead to variations in stiffness and vibration response between different products.
Long-Term Reliability Issues
Trapped air may expand during operation, potentially causing leakage or performance degradation.
Because of these risks, manufacturers must ensure that the filling process completely removes air from internal cavities.
Vacuum Filling Process
Vacuum filling machines evacuate air from the product before injecting damping fluid.
The typical process includes the following steps:
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component positioning
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vacuum evacuation of internal cavities
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fluid injection under vacuum conditions
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sealing of filling ports
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residual liquid removal
By performing the filling operation under vacuum conditions, the damping fluid can fully occupy the internal chamber structure.
Vacuum levels of ≤100 Pa are commonly used to achieve reliable filling results.
Benefits of Vacuum Filling Machines
Vacuum filling systems provide several advantages in hydraulic mount manufacturing.
Complete Fluid Saturation
Vacuum conditions remove trapped air and allow fluid to fully penetrate complex internal cavities.
Stable Product Performance
Consistent filling improves NVH performance consistency across production batches.
Improved Production Efficiency
Automated filling systems can perform vacuum evacuation and fluid injection in a single process cycle.
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