Pneumatic Proportioning System for Heavy-Duty Air Spring Load Management
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Solution Overview
Problem
Prior air-ride axle/suspension systems for heavy-duty vehicles face issues such as overloading of front axle/suspension systems, premature failure of components, and reduced lateral steer compliance due to complete exhaustion of rear air springs, leading to contact between jounce stops and upper bead plates, and potential trapping of flexible air spring members.
Innovation Solution
A pneumatic proportioning system that regulates air distribution between front and rear air springs, preventing complete exhaustion of rear air springs and maintaining optimal pressure to minimize overloading and contact with jounce stops, thereby enhancing component longevity and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rear air springs are completely exhausted to increase maneuverability, then vehicle maneuverability is improved, but front axle/suspension system becomes overloaded and components fail prematurely
Solution Approach 1:
The system applies partial exhaustion action by using a proportioning valve to limit the amount of air exhausted from rear air springs. Instead of complete exhaustion, the valve maintains a minimum pressure threshold (e.g., 10-20 PSI) to prevent total collapse, thereby providing maneuverability improvement while avoiding front axle overload and component failure
2Ease of operation
If rear air springs are completely exhausted, then lateral steer compliance is reduced, but component contact and premature failure occur
Solution Approach 1:
The proportioning valve provides beforehand cushioning by maintaining a minimum pressure threshold in rear air springs before complete exhaustion occurs. This residual pressure acts as a cushion that prevents jounce stops and bumpers from contacting upper bead plates, thereby maintaining lateral steer compliance while protecting components from impact damage and premature failure
3Ease of operation
If air is exhausted from rear air springs, then vehicle maneuverability increases, but flexible air spring members become trapped
Solution Approach 1:
The proportioning valve applies partial exhaustion by maintaining minimum pressure in rear air springs, preventing complete collapse that would cause flexible air spring members to become trapped between jounce stops and upper bead plates. This partial action preserves member reliability while still providing maneuverability improvement
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 pneumatic proportioning system reduces the likelihood of premature failure of suspension components, maintains optimal vehicle height, and increases lateral steer compliance, leading to extended component life and reduced operating costs.
Implementation Method 1
a proportioning valve in fluid communication with the air supply and with the rear air spring, for limiting the flow of air into the rear air spring
Implementation Method 2
a solenoid valve in fluid communication with the proportioning valve and with the rear air spring, for exhausting air from the rear air spring to atmosphere when the solenoid valve is activated
Implementation Method 3
the air springs of the axle/suspension system are adjusted to ensure that the vehicle is at design ride height
Implementation Method 4
compressed air is supplied to the air springs increasing the air pressure inside the air spring, thereby increasing air spring load
Data Source
AI summary
A pneumatic proportioning system for heavy-duty vehicle air springs includes an air supply, a height control valve and a solenoid valve in fluid communication with one another and with the air springs of at least one axle/suspension systems of a heavy-duty vehicle. A proportioning means is in fluid communication with the air supply, with the height control valve, with the solenoid valve, with the air springs and with atmosphere and operates to proportion loads between the air springs of the axle/suspension systems when the solenoid valve is activated during operation of the heavy-duty vehicle.