Fluid Damper Pre-Charge Assembly for Gas Pressure Management
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Solution Overview
Problem
The installation of fluid dampers on vehicles is challenging due to the high pressure of the gas volume, which makes it difficult to mount and maintain the appropriate gas pressure, often resulting in an underpressurized reservoir when checking pressure.
Innovation Solution
A damper design with a pre-charge assembly that separates the gas into two portions, allowing for easy manual adjustment and installation, and a gas pressure indicator to visually confirm the correct pressure without depleting the gas volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas volume in the reservoir is pressurized to high pressure (e.g., 200 psi), then the reservoir can compensate for fluid displacement during compression and rebound strokes, but the damper becomes difficult to mount due to the extending force on the piston and rod
Solution Approach 1:
The gas volume is divided into two separate portions: a first portion in the reservoir and a second portion in a pre-charge assembly. This segmentation allows the pre-charge portion to be charged separately at lower pressure for easy installation, then connected to the reservoir portion afterward to achieve the required operating pressure without mounting difficulties.
Solution Approach 2:
The pre-charge assembly is charged with gas pressure before the damper is installed on the vehicle. This preliminary charging allows the installer to work with a partially pressurized or unpressurized system, making installation easier, and then the pre-charged gas is transferred to the reservoir to establish the required operating pressure.
2Measurement precision
If the gas pressure is checked frequently to ensure proper pressurization, then the pressure status can be monitored, but the gas volume becomes depleted due to the small volume and repeated checking
Solution Approach 1:
The gas system is segmented into a pre-charge assembly and a reservoir, allowing the pre-charge portion to be monitored separately. This enables pressure verification without requiring removal of gas from the operational reservoir, thus preventing depletion of the gas volume needed for damper operation.
Solution Approach 2:
The pre-charge assembly acts as an intermediary that can be charged and monitored separately from the reservoir. This intermediary system allows for pressure checking and adjustment without directly accessing or depleting the main reservoir gas volume, preserving the operational gas supply.
3Reliability
If the damper is provided to the customer in a pre-charged condition with a restraining member, then the gas pressure is maintained, but the damper requires additional components and steps for installation
Solution Approach 1:
The gas management system is segmented into a pre-charge assembly with its own gas supply and a separate reservoir. This allows the pre-charge portion to be charged independently and connected to the reservoir during or after installation, reducing the need for restraining members and simplifying the installation process while maintaining gas pressure.
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
Facilitates the installation of fluid dampers by reducing the manual force required and ensures the reservoir is properly pressurized, maintaining the desired gas pressure without constant checking.
Implementation Method 1
opening the valve comingles the first and second chamber portions so that the combined chamber portions are at a third pressure based on their respective initial pressures and volumes
Data Source
AI summary
A method and apparatus for a shock absorber having a damping fluid compensation chamber with a gas charge. In one aspect, a partition separates a first chamber portion from a second chamber portion, wherein the first portion of the chamber is at a first initial gas pressure and the second portion of the chamber is at a second initial pressure. A valve separates the first and second chamber portions and opening the valve comingles the first and second chamber portions so that the combined chamber portions are at a third pressure. In another aspect, a piston disposed through a wall is in pressure communication with the gas charge and is biased inwardly toward a pressure of the charge, whereby an indicator is movable by the piston in response to the pressure.