Suspension Fork Air Bleed Assembly for Elevation Pressure Equalization
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Solution Overview
Problem
Vehicle suspension systems face increased axial friction due to differential air pressure when assembled at low elevations and used at high elevations, leading to higher friction in telescoping suspension forks, which affects performance.
Innovation Solution
A manually adjustable air bleed assembly that allows users to equalize air pressure within the fork by releasing excessive pressure, reducing friction and preventing oil bath leakage, by using a button-activated mechanism that vents air pressure to match ambient pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suspension fork is sealed at low elevation, then the seal integrity is maintained, but axial friction increases significantly at high elevations due to differential air pressure
Solution Approach 1:
The patent introduces a dynamic pressure equalization system that allows the sealed environment to adapt to changing external conditions. The equalization mechanism enables the internal air pressure to dynamically match external atmospheric pressure at different elevations, resolving the contradiction between maintaining seal integrity and preventing excessive friction.
Solution Approach 2:
The system changes the pressure parameter of the sealed air from a fixed state (sealed at low elevation) to a variable state that can equalize with external pressure. By allowing the internal pressure to change and match external pressure at different elevations, the system eliminates differential pressure and its harmful effects on friction.
2Ease of manufacture
If air pressure is sealed inside the fork at low elevation, then manufacturing is simplified, but friction increases and performance deteriorates at high elevations
Solution Approach 1:
The patent transforms the static sealed pressure system into a dynamic one with an equalization mechanism. This allows the system to maintain manufacturing simplicity (sealed construction) while adding the capability to adapt pressure conditions, thereby resolving the contradiction between ease of manufacture and performance at varying elevations.
3Stress or pressure
If the fork operates at high elevation with sealed low-elevation pressure, then seal load increases, but this creates higher axial friction and potential oil leakage
Solution Approach 1:
The patent converts the harmful effect of differential pressure (which causes excessive seal load and friction) into a beneficial equalized state. By providing a pressure equalization mechanism, the system transforms the potential harm of pressure differential into a balanced condition where internal and external pressures match, eliminating excessive friction and preventing oil leakage.
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 reduces friction in vehicle suspension forks by equalizing air pressure, maintaining the oil bath within the fork and improving ride quality across varying elevations.
Implementation Method 1
When the button is pressed, the O-ring seal moves into the diametrical recess and becomes unsealed, allowing the air pressure to equalize between the sealed lower leg and the external environment by bypassing the button assembly through the vent hole.
Implementation Method 2
The O-ring seal is positioned in a circumferential groove and biased against the upper busings by a spring, creating a seal that can be temporarily displaced to allow pressure equalization while maintaining containment during normal operation.
Implementation Method 3
The O-ring seal is biased against the upper busings by a spring, which provides the necessary force to maintain sealing contact and prevent air pressure leakage during normal operation.
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 a manually operable valve having a first position substantially closing the fluid passage and a second position allowing fluid flow between the interior and the exterior.