Heavy-Duty Air Spring Damping Through Tuned Chamber Airflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air-ride axle/suspension systems for heavy-duty vehicles lack effective damping characteristics, relying on heavy and complex shock absorbers that increase weight, maintenance costs, and reduce cargo capacity.
Innovation Solution
An air spring design optimizing damping by controlling the volume ratios of the bellows and piston chambers and the size and number of openings between them, providing viscous damping without the need for additional components like valves or rubber flaps, thereby eliminating or reducing the need for shock absorbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shock absorbers are added to provide damping, then damping capability is improved, but system complexity and weight increase
Solution Approach 1:
The patent combines the damping function with the air spring by creating internal flow paths within the air spring structure itself. The bellows chamber and piston chamber are connected through controlled openings, allowing air flow that provides damping without requiring separate shock absorber components.
Solution Approach 2:
The air spring is designed to perform multiple functions simultaneously: it provides suspension support through air pressure while also providing damping through controlled air flow between chambers. This multi-functionality eliminates the need for separate dedicated damping components.
2Reliability
If shock absorbers are added to provide damping, then damping capability is improved, but weight increases
Solution Approach 1:
The damping function is merged into the air spring structure through internal chambers and flow paths. The bellows chamber and piston chamber work together within a single component, eliminating the need for additional heavy shock absorber assemblies.
Solution Approach 2:
The damping function is extracted from separate shock absorber components and integrated directly into the air spring structure. This removes the need for additional damping components and their associated weight.
3Reliability
If valves or rubber flaps are added to control air flow, then damping is improved, but device complexity increases
Solution Approach 1:
The air flow control is achieved through the passive geometric design of the bellows and piston chambers themselves. The flexible bellows material and chamber geometry automatically regulate air flow based on suspension movement, eliminating the need for active valves or flaps.
Solution Approach 2:
The patent replaces mechanical flow control devices (valves, flaps) with a pneumatic system based on flexible bellows and pressure differential. The air flow is controlled by pressure differences and geometric constraints rather than mechanical actuators.
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 enhances damping capabilities, reduces system complexity and weight, lowers maintenance costs, and allows for increased cargo capacity by integrating damping directly into the air spring, optimizing ride quality and stability.
Implementation Method 1
the flow of air between the piston chamber and the bellows chamber through the openings located between the piston chamber and the bellows chamber of the air spring provides viscous damping to the air spring
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An air spring for a heavy-duty vehicle axle/suspension system includes a bellows chamber operatively connected to a piston chamber. An opening is disposed between the bellows chamber and the piston chamber in order to allow fluid to communicate between the bellows chamber and the piston chamber. The cross-sectional area of the opening and the volumes of the bellows chamber and the piston chamber are tuned in order to optimize the damping characteristics of the air spring.