Fuel Injection Valve Tapered Seal Angle Optimization
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Solution Overview
Problem
The existing fuel injection valves face a trade-off between improving sealing properties through the wedge effect and limiting seal material displacement, with smaller taper angles enhancing sealing but risking damage to the seal material, while larger angles improve displacement limitation but reduce sealing effectiveness.
Innovation Solution
A fuel injection valve design featuring a first tapered part with a taper angle between 10 degrees to 20 degrees, combined with a second reduced diameter part and a parallel part, which compressively deforms the seal material to maintain sealing properties and prevent damage, by utilizing a wedge effect and an evacuation chamber to prolong seal life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the taper angle is made smaller to enhance the wedge effect and improve sealing properties, then sealing performance is improved, but the seal material is more prone to displacement and damage
Solution Approach 1:
The patent applies parameter changes by optimizing the taper angle of the tapered part to a specific range (5 degrees to 15 degrees) rather than using an arbitrarily small angle. This controlled parameter adjustment maintains the wedge effect for sealing while preventing excessive seal material displacement and damage during installation and operation.
2Stability of the object's composition
If the taper angle is made larger to limit seal material displacement, then seal material stability is improved, but the wedge effect is reduced and sealing properties deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing the taper angle parameter to an optimized range (5 degrees to 15 degrees). This parameter selection balances two opposing requirements: maintaining a small enough angle to generate effective wedge action for sealing, while keeping it large enough to prevent excessive seal material displacement and ensure installation stability.
3Reliability
If a smaller taper angle is used to improve sealing, then the wedge effect is enhanced, but the seal material may be torn up during insertion
Solution Approach 1:
The patent protects seal material integrity by constraining the taper angle within 5 degrees to 15 degrees. This parameter control ensures that the wedge effect is sufficient for sealing while preventing the angle from being so small that it causes excessive friction and tearing of the seal material during the insertion process.
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 design achieves a balance between limiting seal material displacement and enhancing sealing properties, preventing damage and maintaining seal capacity over time by using a compressively deformed seal material and an evacuation chamber, ensuring effective gas sealing in internal combustion engines.
Implementation Method 1
the seal material is clamped between the inner peripheral surface of the attachment hole and the tapered part. As a result, a compressive deformation of the seal material in its radial direction is promoted, so that the surface pressure of the seal material increases (this phenomenon is hereinafter referred to as a wedge effect)
Implementation Method 2
when the fuel injection valve is attached at the predetermined position of the engine by inserting its body into the attachment hole of the engine, the seal material is scraped against the inner peripheral surface of the attachment hole and receives frictional force
Data Source
AI summary
A fuel injection valve is attached to an engine and to have an annular seal material attached thereon. The seal material is attached to a first reduced diameter part. In a use state where a body is inserted in an attachment hole formed at a predetermined position of the engine and a gas pressure that is equal to or higher than a predetermined pressure is applied to the seal material from its nozzle hole-side, the seal material is pressed against a first tapered part by the gas pressure to be compressively deformed, and a clearance between an inner peripheral surface of the attachment hole and an outer peripheral surface of the body is sealed with a compressively-deformed part of the seal material. A taper angle of the first tapered part is set in a range from 10 degrees to 20 degrees.