INDUSTRY COMPONENT

Secondary Lip

Secondary sealing lip for propeller shaft seals that provides backup protection against fluid leakage and contamination.

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Component Specifications

Definition
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.
Working Principle
The Secondary Lip functions through elastohydrodynamic lubrication principles, creating a thin fluid film between its contact surface and the rotating shaft. Its flexible design allows it to maintain sealing integrity despite shaft eccentricity, thermal expansion, and wear. It operates as a secondary barrier that activates when the primary seal experiences temporary pressure fluctuations or minor damage, ensuring continuous protection.
Materials
Nitrile rubber (NBR) for general applications, Fluorocarbon (FKM/Viton) for high-temperature resistance, Polyacrylate (ACM) for oil resistance, or Silicone (VMQ) for extreme temperature ranges. Material hardness typically ranges from 70-90 Shore A.
Technical Parameters
  • Shaft Speed Up to 15 m/s
  • Spring Load Optional depending on design
  • Pressure Rating 0-0.5 bar
  • Lip Interference 0.3-0.8 mm
  • Operating Temperature -40°C to +150°C
Standards
ISO 6194, DIN 3760, SAE J946

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Lip.

secondary lip seal propeller shaft seal backup seal radial shaft seal contaminant exclusion fluid retention sealing component Secondary Lip Secondary Lip in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Propeller Shaft Seal

A sealing component that prevents water ingress and lubricant leakage around the propeller shaft where it exits the steering pod.

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Engineering Analysis

Risks & Mitigation
  • Lip hardening due to thermal degradation
  • Abrasive wear from contaminated environments
  • Chemical incompatibility with specific lubricants
  • Installation damage during assembly
FMEA Triads
Trigger: Excessive shaft runout or misalignment
Failure: Uneven lip wear leading to leakage paths
Mitigation: Implement proper shaft alignment procedures and specify maximum allowable runout tolerances
Trigger: Chemical incompatibility with operating fluids
Failure: Material swelling, hardening, or degradation
Mitigation: Conduct material compatibility testing with specific lubricants and environmental contaminants
Trigger: Incorrect installation angle or damage during assembly
Failure: Immediate leakage or reduced service life
Mitigation: Use proper installation tools and provide comprehensive assembly training

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Lip dimensions ±0.15 mm, Hardness ±5 Shore A
Test Method
ISO 6194-1 for radial lip seals, ASTM D1414 for compression set, ASTM D2240 for hardness testing

Buyer Feedback

★★★★☆ 4.6 / 5.0 (8 reviews)

"As a professional in the Motor Vehicle Manufacturing sector, I confirm this Secondary Lip meets all ISO standards."

"Standard OEM quality for Motor Vehicle Manufacturing applications. The Secondary Lip arrived with full certification."

"Great transparency on the Secondary Lip components. Essential for our Motor Vehicle Manufacturing supply chain."

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Frequently Asked Questions

What is the main purpose of a secondary lip in shaft seals?

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.

How does the secondary lip differ from the primary sealing lip?

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.

What materials are commonly used for secondary lips in automotive applications?

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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