Wheel Suspension Stabilizer with Roll Damper Valves
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Solution Overview
Problem
Modern motor vehicles face a challenge in achieving a balance between reducing rolling during cornering while maintaining driving comfort, as soft chassis springs enhance comfort but increase rolling, and stiff stabilizers reduce rolling but compromise comfort.
Innovation Solution
A wheel suspension unit with a stabilizer connected via a piston-cylinder unit, featuring roll damping valves that allow for adjustable damping characteristics, enabling frequency-dependent roll damping to restrict the stabilizer's action and reduce rolling without compromising comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soft chassis springs are used, then driving comfort is improved, but rolling angle increases during cornering
Solution Approach 1:
The stabilizer bar uses a non-linear torsion spring with variable stiffness characteristics. The spring is designed with varying wire diameter or cross-sectional geometry along its length, allowing it to be soft during small deflections (improving comfort) and stiff during large deflections (reducing roll angle). This parameter change in the spring's mechanical properties resolves the contradiction between comfort and stability.
2Stability of the object's composition
If high rigidity stabilizer is used, then rolling is reduced, but driving comfort deteriorates
Solution Approach 1:
The stabilizer system transitions from a static rigid structure to a dynamic system with variable stiffness. The non-linear torsion spring automatically adjusts its rigidity based on the deflection magnitude: maintaining low stiffness for comfort during normal driving and switching to high stiffness for roll control during aggressive cornering. This dynamic adaptation resolves the contradiction between rolling reduction and driving comfort.
3Ease of operation
If stabilizer action is restricted, then driving comfort is improved, but rolling reduction capability deteriorates
Solution Approach 1:
The stabilizer employs a progressive engagement mechanism where the non-linear spring provides gradual resistance rather than immediate full stiffness. During initial small deflections, the spring remains compliant (restricting action) for comfort, but as deflection increases beyond a threshold, the spring progressively engages its full stiffness (full action) for rolling reduction. This periodic-like progression resolves the contradiction between comfort and roll control.
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 solution effectively reduces vehicle rolling during cornering while allowing for adjustable damping to maintain comfort, especially during straight-line motion and off-road conditions, by dissipating energy through the roll damper rather than storing it in the stabilizer spring.
Implementation Method 1
The piston-cylinder unit is a roll damper. The roll damper comprises a plurality of roll damping valves arranged in a piston of the roll damper. Each of the plurality of roll damping valves comprises a non-return valve and an adjustable throttle valve
Data Source
AI summary
A wheel suspension unit is disclosed. The wheel suspension unit includes a stabilizer having a first end and a second end, a wheel suspension element, and a piston-cylinder unit. The piston-cylinder unit connects an end of the stabilizer to the wheel suspension element. The piston-cylinder unit is a roll damper. The roll damper includes a plurality of roll damping valves arranged in a piston of the roll damper. Each of the plurality of roll damping valves has a non-return valve and an adjustable throttle valve. The non-return valve is arranged in series with the adjustable throttle valve.