Asymmetrical Eddy Current Damper for Directional Suspension Damping
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Solution Overview
Problem
Standard vehicle suspension dampers resist motion equally in both directions, failing to differentiate between compressive and rebound forces, which are often of different amplitudes, leading to suboptimal suspension system performance.
Innovation Solution
The damper design incorporates asymmetrical features such as tilted slots, cavities, and alternating conductivity patterns in the conductor disc and backing, along with strategically placed permanent magnets, to induce different electrical resistances and damping forces based on the direction of rotation, allowing for distinct damping forces during compressive and rebound phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard damper is used, then the structure is simple and manufacturing is easy, but the damping force is symmetrical and cannot differentiate between compressive and rebound forces
Solution Approach 1:
The patent applies asymmetry by introducing non-uniform features in the conductor disc (such as varying slot widths, cavity distributions, or conductivity patterns) that create different electrical resistance paths for clockwise versus counter-clockwise rotation. This asymmetrical design enables the damper to generate different damping forces for compressive and rebound motions, directly resolving the technical contradiction by making the damping characteristic adaptable to different force directions while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements local quality by creating regions within the conductor disc that have different electrical properties (conductivity, resistance, or geometric characteristics) at specific locations. These localized variations in material or structural properties cause the eddy current path to be differently affected depending on rotation direction, enabling directional damping differentiation without requiring complete structural redesign of the entire damper.
2Adaptability or versatility
If asymmetrical features are added to the conductor disc, then different damping forces are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the conductor disc into distinct regions or sections (such as segmented slots, separate cavity zones, or modular conductivity patterns). This segmentation allows each feature to be manufactured and positioned independently with standardized tolerances, reducing the cumulative precision requirements compared to creating complex continuous asymmetrical features. The segmented approach makes the asymmetrical design more manufacturable while preserving the directional damping effect.
3Adaptability or versatility
If tilted slots or cavities are introduced, then electrical resistance varies with rotation direction, but device complexity increases
Solution Approach 1:
The patent applies the taking out principle by introducing slots or cavities that remove material from the conductor disc, creating intentional discontinuities in the conductive path. These extracted regions force the eddy currents to travel along specific predetermined paths that are sensitive to rotation direction. By strategically placing these material removals, the patent achieves electrical resistance modulation with relatively simple geometric modifications rather than complex multi-component structures.
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 design enables the suspension system to provide tailored resistance to forces in both directions, enhancing the vehicle's ability to absorb and manage road bumps and shocks more effectively, improving ride quality and handling.
Implementation Method 1
The magnet induces eddy currents in the conductive disc as a result of the rotation. The eddy currents in the conductive disc dampen or resist the rotary motion.
Implementation Method 2
The magnet induces eddy currents in the conductive disc as a result of the rotation.
Data Source
AI summary
A vehicle, suspension system and method of dampening a force on the suspension system is disclosed. The suspension system includes a damper having a first damping element and a second damping element configured to rotate relative to each other in response to a force received at the suspension system. The second damping element induces an eddy current in the first damping element during relative rotation. A feature of one at least one of the first damping element and the second damping element provides a first electrical resistance to the eddy current during relative rotation in a first direction and a second electrical resistance to the eddy current during relative rotation in a second direction. The first electrical resistance generates a first damping force and the second electrical resistance generates a second damping force.