Base Line Valve Geometry for Adjustable Damper Flow Control
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Solution Overview
Problem
Traditional dampers face challenges in altering the spring rate of the spring to desired characteristics due to packaging constraints and manufacturing variations, limiting the ability to optimize damping performance.
Innovation Solution
A damper design incorporating a base line valve with a plug nose having tapered annular surfaces that control fluid flow, allowing for adjustable flow rates without changing the spring's physical dimensions, and including an annular aperture that remains open regardless of the plug's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spring rate is altered by changing the physical dimension of the spring, then the damping characteristics can be adjusted, but packaging constraints are violated and manufacturing precision deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the plug nose (tapered annular surfaces) rather than the spring dimensions to control damping characteristics. By varying the taper angles and surface profiles of the plug nose, different flow rates are achieved without modifying the spring's physical dimensions, thus maintaining manufacturing precision while achieving adaptability in damping performance
Solution Approach 2:
The patent replaces the traditional mechanical approach of adjusting spring dimensions with a fluid dynamic approach using tapered annular surfaces. The plug nose geometry controls fluid flow rates through the valve, substituting mechanical spring dimension changes with fluid flow control to achieve the desired damping characteristics
2Adaptability or versatility
If the spring physical dimension is changed to adjust spring rate, then damping performance can be optimized, but packaging constraints are exceeded
Solution Approach 1:
The patent changes the geometric parameters of the plug nose (tapered annular surfaces) rather than the spring dimensions to control damping characteristics. By varying the taper angles and surface profiles of the plug nose, different flow rates are achieved without modifying the spring's physical dimensions, thus maintaining packaging constraints while achieving adaptability in damping performance
Solution Approach 2:
The patent shifts the adjustment mechanism from the radial dimension (spring diameter) to the angular dimension (taper angle of annular surfaces). By controlling the flow rate through angular geometry of the plug nose surfaces rather than radial spring dimensions, the solution achieves damping optimization without increasing component volume
3Device complexity
If traditional spring-based valve design is used, then the structure is simple, but the ability to precisely control flow rate is limited
Solution Approach 1:
The patent introduces variable geometric parameters (taper angles, annular surface profiles) on the plug nose to precisely control flow rates. These geometric parameter variations allow fine-tuning of fluid dynamics without significantly increasing overall valve structure complexity, achieving precise flow rate control while maintaining relatively simple valve architecture
Solution Approach 2:
The patent applies local geometric variations specifically on the plug nose annular surfaces rather than throughout the entire valve structure. The tapered surfaces with specific angles and profiles are localized to the flow control region, providing precise flow rate control while keeping the rest of the valve structure simple and uncomplicated
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
Enables precise control of fluid flow rates and damping characteristics, enhancing the damper's performance by allowing independent adjustment of damping levels based on vehicle conditions and driving modes.
Implementation Method 1
a spring urging the plug toward the closed position
Implementation Method 2
The second annular surface of the plug nose is positioned at least partially outside the valve housing and positioned radially inward of the seat by a first dimension when the plug is in the closed position. The second annular surface is positioned radially inward of the seat by a second dimension greater than the first dimension when the plug is in the open position.
Implementation Method 3
The first annular surface of the plug nose is sealingly engaged with a seat of the valve housing to close the opening of the valve housing when the plug is in the closed position
Data Source
AI summary
A damper including a tube, a piston, and a base line valve. The base line valve arranged in fluid communication with at least one of a first and second working chamber of the tube. The base line valve includes a housing, a plug slidably disposed in the housing along a valve axis between open and closed positions, and a spring. The plug includes a plug nose extending through an opening of the housing. The plug nose includes a first annular surface and a second annular surface. The first annular surface being sealingly engaged with a seat of the housing when the plug is in the closed position. The second annular surface being positioned radially inward of the seat by a first dimension when the plug is in the closed position and by a second dimension greater than the first dimension when the plug is in the open position.