Four-Point Link With Fluid Cavity For Axle Stabilization
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Solution Overview
Problem
Existing axle suspensions for commercial vehicles require significant space for stabilizer bars and are costly, making them difficult to install, especially in limited spaces like steered front rigid axles where engine components obstruct.
Innovation Solution
A four-point link system with a central cavity that can store fluid, such as compressed air or steering oil, which serves as both a stabilizer and storage medium, reducing the need for separate containers and optimizing space usage by incorporating a twistable, ductile central part that adjusts volume under torsional stress to influence chassis properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a separate stabilizer bar is used in the axle suspension, then the vehicle achieves lateral stabilization, but the installation space requirement increases significantly
Solution Approach 1:
The patent combines the stabilizer bar function with the four-point link structure by making the central area torsionable. The link arms are firmly connected to form a central area that can twist, integrating the stabilization function directly into the suspension linkage rather than using a separate stabilizer bar component.
Solution Approach 2:
The four-point link serves multiple functions simultaneously: it guides the vehicle longitudinally and laterally, provides lateral stabilization through torsional movement of the central area, and eliminates the need for a separate stabilizer bar. This multi-functional design reduces the overall space requirement while maintaining stabilization capability.
2Area of stationary object
If a four-point link with torsionable central area is used, then the stabilizer bar installation space is eliminated, but the device complexity increases
Solution Approach 1:
The patent merges the stabilizer bar function into the four-point link's central area, which is designed to be torsionable. This integration eliminates the need for a separate stabilizer bar while maintaining the stabilization function, thereby reducing installation space without proportionally increasing complexity.
3Stability of the object's composition
If the central area is made torsionable for stabilization, then lateral rolling is counteracted, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making only the central area of the four-point link torsionable, while the link arms remain rigid for structural support. This localized torsionability provides roll stabilization where needed without requiring the entire structure to be complex or flexible, simplifying manufacturing compared to a fully torsional design.
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 simplifies and saves space by integrating fluid storage within the axle suspension, enhancing stability and reducing installation complexity while maintaining structural integrity and shock-absorbing properties.
Implementation Method 1
the cavity is designed to store a fluid. The fluid can be, for example, compressed air to operate the air suspension of the air-sprung vehicle rigid axle or steering oil to operate the steering system of the vehicle
Implementation Method 2
the volume of the cavity in the middle part changes during a torsional movement of the middle part. When compressed air or other fluids are stored in the cavity, the physical properties of the chassis can be specifically influenced
Data Source
Figure 1~2
AI summary
The invention relates to a four-point linkage for connecting a vehicle rigid axle to a vehicle frame of a vehicle, in particular a commercial vehicle, with four link arms (2A, 2B) rigidly connected to each other by a central area and extending away from the central area, of which two first link arms (2A) can be articulated to the vehicle frame and two second link arms (2B) can be articulated to the vehicle axle, characterized in that the central area is designed as a closed cavity (5) which is designed for storing a fluid.