Rubber Lip Seal Composition for Long-Lasting Low Torque
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Solution Overview
Problem
Rotary shaft lip-type seals used in automobiles face challenges in maintaining low torque over a long period while ensuring high sealing performance, as existing methods like adding solid lubricants or satin finish processing are ineffective under continuous lubrication conditions and wear out quickly.
Innovation Solution
A sealing member composed of a vulcanized rubber composition containing carboxyl-containing acrylic rubber, silica, and glass fibers, with a silica content of 25 to 100 parts by weight per 100 parts of rubber, which generates a rough sliding contact surface through wear and silica separation, creating a fluid film for reduced shear resistance and maintaining low torque and sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If satin finish processing and coating processing are applied to the sliding portion, then low torque is achieved by reducing contact area, but the low torque effect vanishes in short term after coating wear
Solution Approach 1:
The invention enables the sealing member to self-maintain its low torque performance through controlled wear. The silica particles and glass fibers continuously generate protrusions on the sliding surface during operation, automatically replenishing the surface roughness that promotes fluid film formation. This self-renewing mechanism eliminates the need for periodic re-coating while maintaining low torque.
Solution Approach 2:
The invention ensures continuous generation of lubrication-friendly surface features through the controlled wear of silica and glass fibers. As the sealing member operates, these fillers continuously protrude and create the necessary surface asperities, maintaining uninterrupted fluid film formation and consistent low torque performance over extended periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains low torque and sealing performance over a long period by continuously generating a rough sliding contact surface, reducing shear resistance and ensuring appropriate tightening force, thus addressing the limitations of existing methods.
Implementation Method 1
a fluid film is effectively produced between the sliding contact surface and the mating member, which produces good lubricating condition
Implementation Method 2
generation of protrusions caused by wear of the vulcanized rubber, separation of the silica
Data Source
AI summary
A sealing member includes a sliding portion made of a vulcanized rubber composition. The rubber composition includes a carboxyl-containing acrylic rubber, a silica, and a glass fiber. A content of the silica is 25 to 100 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.