Yieldable Seal Retainer for Engine Fuel Leak Passageway
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Solution Overview
Problem
Existing engine sealing systems fail to effectively prevent moisture ingress into fuel leak passageways, leading to rust formation and potential cylinder head cracking, while also not allowing easy egress of pressurized leaked fuel.
Innovation Solution
A sealing system comprising a cylinder head, coupler, fuel injector line, seal retainer, and seal, where the seal retainer yields the seal to a seated position to block moisture ingress and an unseated position to allow pressurized leaked fuel egress, using a biasing plate and mounting tabs to facilitate movement between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is used to block moisture ingress into the fuel leak passageway, then rust formation is prevented, but the egress of pressurized leaked fuel is resisted
Solution Approach 1:
The seal is made movable between a first position (blocking moisture ingress) and a second position (allowing fuel egress) through the yieldable seal retainer. This dynamic positioning resolves the contradiction by allowing the seal to adapt its function based on the type of substance encountered - blocking moisture when stationary but opening to release pressurized fuel when needed.
Solution Approach 2:
The seal system is self-actuating through the yieldable seal retainer that automatically responds to pressure changes. When pressurized leaked fuel accumulates, the pressure itself moves the seal to the unseated position, eliminating the need for external control mechanisms and enabling automatic fuel egress while maintaining moisture blockage during normal operation.
2Reliability
If the seal is held in a fixed seated position to block moisture, then rust prevention is effective, but pressurized leaked fuel cannot escape
Solution Approach 1:
The seal transitions from a fixed positioning concept to a dynamic one, where the yieldable seal retainer allows automatic movement between sealed and open states. This resolves the contradiction by maintaining effective sealing during normal operation while enabling rapid fuel egress when pressure builds up, thus serving both reliability and productivity requirements.
Solution Approach 2:
The system uses hydraulic pressure from the leaked fuel itself to actuate the seal movement. The pressurized fuel exceeds the retaining force of the seal retainer, automatically moving the seal to the unseated position and providing efficient fuel egress without mechanical actuators, thereby maintaining both sealing effectiveness and egress efficiency.
3Reliability
If the seal retainer strongly retains the seal to ensure moisture blockage, then rust prevention is improved, but fuel leak passage becomes blocked
Solution Approach 1:
The seal retainer's yieldable characteristic allows it to dynamically adjust its retaining force. Under normal conditions, it strongly holds the seal to block moisture. When pressurized fuel accumulates, the pressure overcomes the retaining force, automatically moving the seal to allow fuel flow, thus preventing blockage while maintaining moisture protection.
Solution Approach 2:
The system changes the pressure parameter to control seal position. The yieldable seal retainer allows the seal to move when fuel pressure exceeds a threshold value, transforming the seal from a moisture-blocking state to a fuel-egress state. This parameter-based control resolves the contradiction by using pressure as the switching mechanism between protective and clearing functions.
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
Prevents rust formation by blocking moisture ingress while allowing minimal resistance to the egress of leaked fuel, thereby preventing cylinder head cracking and ensuring efficient fuel flow.
Implementation Method 1
the seal retainer yieldably urges the seal towards a seated position
Implementation Method 2
in response to pressurized leaked fuel in the fuel leak passageway
Data Source
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AI summary
A sealing system comprising a cylinder head, a coupler, a fuel injector line, a seal retainer, and a seal. The coupler is positioned in the cylinder head, and the fuel injector line extends into the coupler so as to at least partially define a fuel leak passageway therebetween. The seal retainer yieldably urges the seal towards a seated position in which the seal established a sealed connection between the fuel injector line and the coupler, so as to block ingress of moisture into the fuel leak passageway. Further, the seal retainer allows movement of the seal away from the seated position to an unseated position in which the sealed connection between the fuel injector line and the coupler is broken in response to pressurized leaked fuel, in the fuel leak passageway, so as to allow the pressurized leaked fuel to flow out of the fuel leak passageway.