Shuttle Valve Spool-Sleeve Assembly With Press-Fit Locking
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Solution Overview
Problem
Conventional shuttle valves in hydraulic systems face issues with durability, leaks, and operational control, particularly in aircraft hydraulic systems, where they require frequent maintenance and replacement due to worn-out components and multiple seals, leading to increased costs.
Innovation Solution
A spool-sleeve assembly with segmented flanges and press fittings that utilize a collet mechanism for internal locking, eliminating traditional detent mechanisms and enhancing sealing with metal-to-metal contact, resulting in improved performance and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detent mechanisms and multiple seals are used in shuttle valves, then sealing capability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent removes traditional detent mechanisms and multiple seals from the shuttle valve design, extracting only the essential sealing function. This is achieved through a simplified spool-sleeve assembly where the spool directly interfaces with the sleeve to create sealing, eliminating unnecessary components while maintaining sealing capability.
Solution Approach 2:
The patent combines multiple functions into unified components. The spool-sleeve assembly merges the sealing function, positioning function, and control function into a single integrated structure, where the spool both seals against the sleeve and provides the shuttling motion for valve control, reducing overall component count and complexity.
2Ease of operation
If traditional shuttle valve components are used, then operational control is achieved, but durability decreases due to worn-out components
Solution Approach 1:
The spool-sleeve assembly is designed to be self-lubricating and self-regulating through metal-to-metal contact with inherent friction characteristics. The T-seal friction and press fitting lock create self-contained sealing and positioning mechanisms that do not require external lubrication systems or frequent adjustment, thereby improving durability while maintaining operational control.
3Reliability
If multiple seals and retainers are used in shuttle valves, then sealing is improved, but maintenance requirements and operational costs increase
Solution Approach 1:
The patent extracts and eliminates multiple seals and complex retainer systems, replacing them with a single T-seal and press fitting lock mechanism. This reduction in component count directly lowers maintenance requirements while the carefully designed T-seal geometry maintains effective sealing performance.
Solution Approach 2:
The simplified spool-sleeve assembly is designed as a wear-resistant system where the metal-to-metal contact surfaces are engineered to withstand prolonged use without degradation. The press fitting lock provides permanent fixation that eliminates the need for repeated sealing component replacement, reducing maintenance frequency and operational costs.
4Ease of operation
If conventional shuttle valve designs are used, then fluid flow control is achieved, but leaks occur due to worn seals
Solution Approach 1:
The spool-sleeve assembly utilizes composite sealing approaches combining metal-to-metal contact surfaces with T-seal friction elements. This composite approach creates multiple sealing mechanisms working together, where the metal surfaces provide structural integrity and the T-seal provides flexible sealing, preventing leaks while maintaining fluid flow control.
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 spool-sleeve assembly design enhances durability, reduces leaks, and provides greater operational control, leading to fewer maintenance requirements and lower operational costs by using a simplified retainer system with a press fitting lock and T-seal friction, improving overall shuttle valve performance.
Implementation Method 1
T-seal friction
Data Source
AI summary
A spool-sleeve assembly includes a sleeve having a first inner radius. Flanges are integrally formed with the sleeve. The flanges extend outwardly. The flanges have flange segments via slits, disposed in the flanges. Press fittings extend inwardly from an inner wall of the sleeve proximate the ends and the slits. The sleeve has a second inner radius, smaller than the first inner radius, at the press fittings. A hole is provided through the sleeve between the flanges. The spool-sleeve assembly also includes a spool, slidably disposed inside the sleeve. Ridges outwardly extend from the spool at the ends of the spool. The ridges have outer diameters that are greater than the second inner radius. Grooves are provided in the ridges. The press fittings fit in the grooves.