Damper Piston Bleed Valve for Tunable Low-Speed Damping
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Solution Overview
Problem
Existing damper valves in vehicle suspensions lack tunable damping characteristics in the low speed range, leading to inadequate handling and ride comfort, and require improvements in reliability, manufacturability, and cost.
Innovation Solution
A damper assembly with a piston featuring a pressure-sensitive bleed valve that includes a working disc stack deflectable in two opposite directions, regulating fluid flow through multiple channels during compression and rebound strokes, providing tunable damping from near-zero speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple constant orifice valve design is used, then the device complexity is reduced and manufacturing cost is lowered, but the damping characteristics cannot be tuned in the low speed range and the damping force is close to zero in ultra-low speed range
Solution Approach 1:
The valve is segmented into multiple functional components: a constant orifice for high-speed flow, a variable orifice with a movable disc for low-speed flow control, and a spring mechanism for pressure-sensitive regulation. This segmentation allows each component to handle different velocity ranges independently, providing tunable damping characteristics across the entire speed spectrum while maintaining relatively simple individual component designs
Solution Approach 2:
The valve transitions from a static constant orifice design to a dynamic system where a movable disc responds to pressure changes. The disc deflects in response to differential pressure across the valve, dynamically adjusting the orifice opening based on real-time operating conditions. This dynamic adjustment enables tunable damping characteristics in the low-speed range while maintaining simplicity through passive pressure-responsive operation
2Adaptability or versatility
If a complex damper valve design is used to provide tunable damping characteristics, then the adaptability and handling are improved, but the device complexity increases and manufacturing cost rises
Solution Approach 1:
The valve employs a self-regulating mechanism where the spring-loaded disc automatically adjusts the orifice opening based on differential pressure without external control systems. The valve serves itself by using the incoming fluid pressure to actuate the adjustment mechanism, eliminating the need for complex electronic controls or external actuators while providing tunable damping characteristics
Solution Approach 2:
The valve utilizes hydraulic principles by employing a spring-loaded disc that deflects in response to differential pressure across the valve. The pressure differential caused by fluid flow through the valve directly actuates the disc movement, creating a pressure-sensitive flow control system that provides tunable damping characteristics through passive hydraulic action
3Force
If a pressure-sensitive bleed valve with working disc is used, then the damping force becomes more linear and handling is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The valve changes the flow characteristic parameter from constant (fixed orifice) to variable (pressure-sensitive orifice). By using a spring-loaded disc that deflects in response to differential pressure, the effective orifice area becomes a variable parameter that changes with operating conditions. This parameter change creates a more linear damping force characteristic while the spring mechanism provides inherent tolerance compensation
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 pressure-sensitive bleed valve offers appropriate damping from near-zero damper speeds with a more linear increase in force, improving handling and ride comfort while being easy to manufacture and non-restrictive at high speeds.
Implementation Method 1
The pressure-sensitive bleed valve covers the at least one additional channel, and includes at least one working disc and an outer disc that is disposed radially outside of the at least one working disc. The at least one working disc is abutted against the outer disc in a radial direction, and is deflectable in two opposite directions along the center axis for regulating flow of the working fluid through the piston during the compression stroke and the rebound stroke.
Data Source
AI summary
A damper assembly and a piston therefor. The piston includes a pressure-sensitive bleed valve which includes at least one working disc and an outer disc that is disposed radially outside of the at least one working disc. The at least one working disc is abutted against the outer disc in a radial direction, and is deflectable in two opposite directions along the center axis for regulating flow of the working fluid through the piston during the compression stroke and the rebound stroke.