Multi-Link Suspension Geometry to Decouple Steering Feedback
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Solution Overview
Problem
Existing suspension systems for vehicles fail to effectively reduce external forces delivered to the operator, particularly in rough terrain, due to their reliance on transverse forces that affect steering, leading to loss of control and increased feedback.
Innovation Solution
A multi-link suspension system with an arcuate telescoping design that geometrically isolates load paths, decoupling vertical and horizontal load reactions, and maintaining the wheel centerline on a fixed axis to eliminate external steering angle changes, thereby reducing feedback to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional multi-link suspension system with spring and damper is used, then the suspension can support vehicle weight and absorb shocks, but external forces from rough terrain are transmitted to the steering system and operator
Solution Approach 1:
The suspension system is divided into separate functional segments: the arcuate telescoping mechanism handles steering angle stabilization by constraining lateral movement, while the spring and damper system independently handles vertical load support. This segmentation allows each component to specialize in its function, preventing force transmission between steering and suspension systems.
Solution Approach 2:
The arcuate telescoping mechanism acts as an intermediary between the wheel assembly and the chassis, absorbing and isolating external forces before they can reach the steering system. By positioning this mechanism in the force transmission path, it mediates the interaction between rough terrain forces and the steering control.
2Adaptability or versatility
If the suspension allows extensive wheel travel for off-road capability, then the vehicle can navigate rough terrain, but the wheel centerline moves off the fixed axis causing steering angle changes and feedback
Solution Approach 1:
The arcuate telescoping mechanism employs a curved or arc-shaped geometry that allows the wheel assembly to move vertically for off-road capability while the curvature guides the movement along a controlled path that maintains the wheel centerline on the fixed axis, preventing unwanted steering angle changes.
Solution Approach 2:
The suspension system changes the geometric parameters of wheel movement by constraining the wheel centerline to remain on a fixed axis while allowing vertical displacement. This parameter control ensures that extensive wheel travel does not result in steering angle variations.
3Adaptability or versatility
If the suspension geometry allows wheel movement for terrain adaptation, then the vehicle can handle rough terrain, but the steering system requires power assistance to counteract external forces
Solution Approach 1:
The arcuate telescoping mechanism extracts and isolates the steering angle control function from the main suspension system. By separating this function into a dedicated mechanism that maintains the wheel centerline on a fixed axis, the system eliminates the need for power steering energy to counteract terrain-induced steering forces.
Solution Approach 2:
The arcuate telescoping mechanism provides self-service steering angle stabilization by its geometric design, which automatically maintains the wheel centerline on the fixed axis during vertical wheel movement. This self-regulating geometry eliminates the need for external power assistance for steering control.
Data Source
AI summary
Various suspension systems for vehicles are described that preferably comprise a multi-link suspension where one or more of the links can move independently of the other links. The multiple independent links are connected to an upright, vertical load reaction that is decoupled from horizontal load reaction, thus delivering a more comfortable ride and reduced feedback to the driver or operator of the vehicle. By eliminating that external feedback using the inventive subject matter discussed herein, vehicles can be safer and easier to control in all circumstances.