Spool Valve Load Damping for Aircraft Nose Gear Steering
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Solution Overview
Problem
Existing hydraulic steering system control circuits for aircraft are complex and costly to manufacture and maintain, and they do not effectively address the dynamic load damping needs of aircraft nose gear steering systems.
Innovation Solution
A dynamic load damping apparatus with a simplified construction, featuring a spool valve and a sleeve within a circuit housing, which reduces manufacturing costs and improves load control on aircraft steering systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple valves and complex control circuits are used to dampen dynamic loads, then load control effectiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple valve functions into a single integrated spool valve with multiple lands (first, second, and third lands) that perform load damping, pressure regulation, and flow control functions simultaneously. This merging of functions reduces the number of separate components while maintaining effective load control.
Solution Approach 2:
The spool valve is designed as a multi-functional component where different lands perform different functions: the first land controls load damping, the second land regulates pressure, and the third land manages flow distribution. This universal design allows one component to replace multiple specialized valves.
2Reliability
If multiple valves and complex control circuits are used to dampen dynamic loads, then load control effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
By integrating multiple valve functions into a single spool valve assembly, the patent reduces the total number of parts that need to be manufactured, assembled, and quality-tested. This consolidation directly reduces manufacturing costs while maintaining load control effectiveness.
3Reliability
If multiple valves and complex control circuits are used to dampen dynamic loads, then load control effectiveness is improved, but maintenance difficulty and cost increase
Solution Approach 1:
The integrated spool valve design reduces the number of potential failure points and simplifies the maintenance process. Instead of troubleshooting and potentially replacing multiple separate valves, maintenance personnel only need to service a single integrated component, reducing maintenance time and expertise requirements.
4Ease of manufacture
If a simplified construction with a single spool valve is used, then manufacturing cost is reduced, but load damping effectiveness may be compromised
Solution Approach 1:
The spool valve incorporates locally differentiated features with each land having specific geometries and positions optimized for its function. The first land is configured for load damping, the second for pressure regulation, and the third for flow control, ensuring that each local region of the single component performs its specific function effectively.
Solution Approach 2:
The patent utilizes changes in spool valve position and land exposure to dynamically adjust hydraulic parameters (flow rate, pressure, directional control) in response to varying load conditions, enabling a single component to effectively handle a wide range of damping requirements.
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 dynamic load damping apparatus effectively reduces the cost of manufacturing hydraulic steering system control circuits while improving the stability and control of aircraft nose gear steering systems by efficiently managing dynamic loads.
Implementation Method 1
a first restricted conduit extending across the spool valve and providing fluid communication between the first groove and the first portion of the interior bore
Implementation Method 2
The first restricted conduit may extend across the exterior surface of the first land, or may extend through the first land
Data Source
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AI summary
A dynamic load damping apparatus is employed in a hydraulic steering system control circuit of an aircraft. The dynamic load damping apparatus is positioned in the hydraulic steering system control circuit in parallel with a control valve of the control circuit that functions as the hydraulic fluid source of the control circuit and an actuator that controls movements of a nose gear of the aircraft. The dynamic load damping apparatus dampens loads transmitted to the hydraulic actuator that controls the steering movements of the nose gear on the aircraft.