Hydraulic Stabilizer Assembly With Switchable Spring Characteristics
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Solution Overview
Problem
Existing vehicle stabilizer systems face challenges in achieving optimal sealing and volume flow of hydraulic medium, leading to limited damping capabilities and increased complexity and cost.
Innovation Solution
A stabilizer assembly for a two-track vehicle that operates on multiple spring characteristics, utilizing a torsion bar spring and a hydraulic actuator with a frequency-selective valve or control unit to adjust damping forces without external energy, allowing for variable volume flow and simplified sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive stabilizer with a one-piece torsion bar is used, then the structure is simple and cost-effective, but the damping capability is limited and cannot be controlled
Solution Approach 1:
The stabilizer is divided into two separate stabilizer halves instead of using a one-piece torsion bar. This segmentation allows each half to be independently connected to the wheel suspension while enabling the introduction of a controllable actuator between them, thus maintaining structural simplicity while gaining adjustable damping capability.
Solution Approach 2:
An actuator is introduced as an intermediary element between the two stabilizer halves. This actuator can actively control the connection and decoupling of the stabilizer halves, providing adjustable damping forces and torques while maintaining the overall simplicity of the stabilizer structure.
2Adaptability or versatility
If an active stabilizer with external energy source is used, then the damping capability and driving dynamics are improved, but the weight and cost increase
Solution Approach 1:
The actuator is designed to be self-contained without requiring external energy sources such as pumps or motors. The actuator uses its own internal mechanisms to generate the necessary forces and torques, eliminating the need for additional heavy components and external energy supply systems while maintaining adjustable damping capability.
3Adaptability or versatility
If the stabilizer halves are always connected, then the driving dynamics are improved, but the copying effects and comfort deteriorate
Solution Approach 1:
The connection between the two stabilizer halves is made dynamic rather than static. The actuator enables the stabilizer halves to be connected when driving dynamics are needed (e.g., during cornering) and decoupled when comfort is prioritized (e.g., during straight-line travel), allowing the system to adapt to different driving conditions.
4Force
If the passage cross-section of fluid connection is reduced, then the damping force increases, but the volume flow of hydraulic medium decreases
Solution Approach 1:
The actuator is designed to establish the fluid-conducting connection between the work chambers before significant rolling movements occur. This preliminary connection allows the hydraulic medium to flow and build up damping forces in advance, ensuring optimal damping performance without restricting the volume flow during actual damping events.
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 provides enhanced damping capabilities with reduced energy consumption and complexity, optimizing both comfort and driving dynamics by switching between spring characteristics based on vehicle conditions.
Implementation Method 1
the two stabilizer halves are coupled such that they can rotate relative to each other about their longitudinal axis by means of a spring element
Implementation Method 2
the actuator comprises at least two work chambers which are filled with a hydraulic medium and coupled to each other by a fluid-conducting connection
Implementation Method 3
the passage cross-section of which is actively alterable by means of a frequency-selective valve
Data Source
AI summary
The invention relates to a stabilizer assembly of a two-track vehicle for stabilizing a rolling movement, the stabilizer assembly being operable on at least two different spring characteristics, comprising a first and a second stabilizer half, each coupled to a wheel of the vehicle, wherein the first and the second stabilizer halves are coupled such that they can rotate relative to each other about their longitudinal axis by means of a spring element, whereby the stabilizer is operable with a first spring characteristic, and wherein the first and the second stabilizer halves can be hydraulically coupled such that they can rotate relative to each other about their longitudinal axis by means of a hydraulic actuator, whereby the stabilizer is operable using at least one second spring characteristic. The actuator comprises at least two work chambers which are filled with a hydraulic medium and coupled to each other by a fluid-conducting connection, and the actuator comprises a transmission unit which is designed such that a rotational movement of the stabilizer halves can be converted into a translational movement of an intermediate element arranged between the two work chambers, and a volume flow of the hydraulic medium from the one work chamber into the other work chamber can thus be produced.