Hydraulic Suspension Cutoff Valve with Adjustable Delay Timing
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Solution Overview
Problem
Existing hydraulic suspension systems in tyred-wheel transport vehicles face issues with sudden valve closure due to abrupt fluid flow increases, leading to pressure overload and suspension overloading, especially on uneven road surfaces or speed bumps, as current cutoff valves fail to manage flow delays effectively.
Innovation Solution
A cutoff valve assembly with adjustable timing means that allows external adjustment of the delay between the initial flow exceedance and valve closure, based on stress on the hydraulic suspension, using a variable-volume chamber and adjustable components to regulate fluid flow and prevent sudden pressure peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutoff valve is used to prevent fluid leakage in case of hose failure, then reliability is improved, but the valve causes abrupt closure and pressure overload when flow exceeds threshold due to road irregularities
Solution Approach 1:
The valve assembly is configured to activate at a first instant when flow exceeds threshold, but reaches closed position at a second instant delayed with respect to the first instant. This preliminary delay action prevents abrupt closure while still achieving the ultimate goal of cutting off failed cylinders, thereby reducing pressure overload on the hydraulic system.
2Loss of time
If a delayed parachute valve with fixed timing chamber volume is used, then valve closure is delayed, but the delay time is insufficient when actual flow exceeds five times the estimated design flow
Solution Approach 1:
The valve assembly incorporates adjustable timing means that enable adjustment of the delay time between activation and closure based on actual operating conditions. This dynamic adjustment capability allows the valve to provide adequate delay time even when actual flow exceeds five times the estimated design flow, ensuring reliable operation across varying road conditions and speeds.
3Speed
If the valve activates immediately when flow exceeds threshold, then responsiveness is improved, but severe pressure peaks and suspension overloading occur
Solution Approach 1:
The valve assembly is configured to activate at a first instant when flow exceeds threshold, but reaches closed position at a second instant delayed with respect to the first instant. This preliminary delay action prevents abrupt closure while still achieving the ultimate goal of cutting off failed cylinders, thereby reducing pressure overload on the hydraulic system.
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 solution prevents severe pressure peaks and suspension overloading by allowing a controlled delay in valve closure, enabling smoother operation on various road surfaces and reducing the impact of flow variations on valve timing, thus enhancing the stability and reliability of hydraulic suspension systems.
Implementation Method 1
hydraulic timing means for moving the valve assembly into a closed position or a position cutting said hydraulic cylinder off from said feed pipe at a second instant delayed with respect to the first instant
Data Source
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AI summary
In a hydraulic suspension (5), operating fluid flow to a hydraulic cylinder (6) of the hydraulic suspension (5) is controlled by a delayed cutoff valve assembly (8), in which the time between the instant the valve assembly (8) intervenes and the instant the valve assembly closes or cuts off the hydraulic cylinder (6) is adjusted as a function of stress on the hydraulic suspension (5).