Secondary sealing lip for propeller shaft seals that provides backup protection against fluid leakage and contamination.
The Secondary Lip is a critical sealing component in propeller shaft seal assemblies, designed as a redundant sealing barrier that operates in conjunction with the primary lip. It prevents lubricant leakage from the gearbox or transmission while blocking external contaminants like water, dust, and debris from entering the system. This component typically features a flexible geometry that maintains consistent contact pressure against the rotating shaft surface under varying operational conditions.
诱因 → 失效模式 → 工程缓解
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The secondary lip provides redundant sealing protection by preventing lubricant leakage and blocking external contaminants when the primary seal is compromised or during pressure variations.
The secondary lip typically has less aggressive contact pressure and is designed primarily for contaminant exclusion rather than high-pressure fluid retention, though it provides backup sealing capability.
Nitrile rubber (NBR) is most common for general use, while fluorocarbon (FKM) is preferred for high-temperature environments, and polyacrylate (ACM) offers superior oil resistance.
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