Fluororubber Seal Composition for Bidirectional High-Speed Sealing
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Solution Overview
Problem
Existing fluororubber compositions fail to maintain effective sealing and prevent noise under high operating temperatures and rotational speeds during both forward and reverse rotations, especially in electric vehicles.
Innovation Solution
A fluororubber composition comprising 10 to 60 parts by weight of wollastonite with an aspect ratio of 7 to 15 and 2 to 20 parts by weight of diatomaceous earth, compounded with fluororubber, enhances the sealing properties and resistance to deformation, ensuring effective sealing in both rotational directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluororubber composition is used, then basic sealing function is provided, but sealing performance deteriorates under high temperature and high rotational speed conditions in both forward and reverse rotation
Solution Approach 1:
The patent uses a composite filler system combining wollastonite (aspect ratio 3-10) with silica, where wollastonite provides structural stability and deformation resistance at high temperatures, while silica enhances lubrication properties. This composite approach allows the material to maintain sealing performance under both high temperature and high rotational speed conditions in bidirectional rotation.
Solution Approach 2:
The patent optimizes the aspect ratio of wollastonite to a specific range of 3-10, which is critical for achieving the right balance between deformation resistance and lubrication. It also controls the precise composition ratios: 5-50 parts wollastonite and 5-30 parts silica per 100 parts fluororubber, ensuring optimal performance under extreme operating conditions.
2Reliability
If filler content is increased to improve sealing, then sealing properties improve, but deformation resistance and lubrication conditions deteriorate
Solution Approach 1:
The patent creates a synergistic composite system where wollastonite's high aspect ratio (3-10) provides exceptional deformation resistance and structural stability, while the accompanying silica particles maintain lubrication properties. This composite structure allows high filler content (5-80 parts total per 100 parts fluororubber) without sacrificing deformation resistance or lubrication.
Solution Approach 2:
The patent creates different functional zones within the compound: wollastonite particles provide local reinforcement and deformation resistance in critical stress areas, while silica particles are distributed to maintain lubrication films in sliding contact zones. This spatial functional differentiation resolves the contradiction between sealing and deformation resistance.
3Reliability
If filler content is increased to improve sealing, then sealing properties improve, but noise increases due to deteriorated lubrication conditions
Solution Approach 1:
The patent uses a dual-filler composite where wollastonite provides structural stability and silica specifically addresses lubrication requirements. The silica particles maintain effective lubrication films even at high filler contents, preventing the noise that would otherwise result from poor lubrication conditions during high-speed rotation.
Solution Approach 2:
The patent optimizes the silica content to 5-30 parts per 100 parts fluororubber, which is sufficient to maintain lubrication properties without excessive filler content. This controlled parameter adjustment ensures that sealing properties improve while noise remains controlled through maintained lubrication conditions.
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 composition maintains good fluid sealing and reduces noise, even at high temperatures and speeds, by suppressing deformation and improving lubrication conditions, thus ensuring reliable sealing in both forward and reverse operations.
Implementation Method 1
it has been found that the deformation of a sliding surface in a sliding direction can be suppressed by compounding a fluororubber compound with wollastonite with a specific aspect ratio
Implementation Method 2
the lubrication conditions between the rotating shaft and the oil seal become more severe, leading to problems such as leakage being more likely to occur
Data Source
AI summary
A fluororubber composition having 10 to 60 parts by weight of wollastonite with an aspect ratio of 7 to 15 and 2 to 20 parts by weight of diatomaceous earth based on 100 parts by weight of fluororubber with a hardness Hs of 75 to 85. The fluororubber composition can be suitably used as a vulcanization molding material of an oil seal for both forward and reverse rotation that can maintain good fluid sealing in both forward and reverse operation even under high operating environment temperatures (e.g., 100 to 200° C.) and high rotational speeds (e.g., 8,000 to 15,000 rpm).