Suspension Air Bleed Assembly for Elevation Pressure Equalization
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Solution Overview
Problem
Shock assemblies, such as those in vehicles, experience increased axial friction due to pressure differentials when operated at elevations different from their assembly location, leading to reduced performance and increased wear on seals.
Innovation Solution
An automatic air pressure equalization system that continuously adjusts the internal air pressure within the shock assembly to match ambient pressure, using an automatic air bleed assembly with oleophobic and hydrophobic properties to prevent fluid leakage and external contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shock assembly is sealed to maintain internal pressure, then structural integrity and seal protection are improved, but pressure differential causes increased axial friction and reduced performance at different elevations
Solution Approach 1:
An automatic air bleed assembly is introduced as an intermediary component between the sealed internal environment and the external atmosphere. This assembly includes a bleed valve that automatically equalizes pressure by allowing controlled air exchange, thereby eliminating the harmful pressure differential that causes axial friction while maintaining the sealed structure's integrity and protection functions
Solution Approach 2:
The internal air pressure parameter is made dynamically adjustable through the automatic air bleed assembly. The system automatically changes the pressure parameter to match external ambient pressure at different elevations, eliminating the pressure differential without requiring manual intervention or compromising the sealed structure
2Productivity
If the air bleed assembly is made permeable to equalize pressure, then axial friction is reduced, but fluid leakage and external contamination may occur
Solution Approach 1:
The air bleed assembly exhibits different permeability properties for different substances: it is permeable to air molecules for pressure equalization, but impermeable to oil and water contaminants. This local quality differentiation allows the same structure to perform multiple functions - equalizing pressure while preventing fluid leakage and external contamination
Solution Approach 2:
The air bleed assembly utilizes composite material properties combining oleophobic (oil-repelling) and hydrophobic (water-repelling) characteristics with air permeability. This composite functionality enables the material to selectively allow air passage while blocking fluid contaminants, resolving the contradiction between pressure equalization and contamination prevention
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
This solution reduces axial friction and maintains optimal performance across varying elevations by ensuring equalized air pressure, while preventing oil leakage and external contamination, thus enhancing the durability and efficiency of the shock assembly.
Implementation Method 1
automatic air bleed assembly with oleophobic and hydrophobic properties
Implementation Method 2
automatic air bleed assembly with oleophobic and hydrophobic properties
Data Source
AI summary
An air bleed system for a suspension fork or shock absorber includes: a fluid passage between an interior of the suspension and an exterior of the suspension; and an automatic air bleed assembly having a material with oleophobic and hydrophobic properties to allow the fluid passage to remain open while limiting the introduction of external fluid into the interior of the suspension and limiting the escape of internal fluid out of the interior of the suspension.