Fuel Injection Valve Flat Cross-Section Nozzle
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Solution Overview
Problem
Conventional fuel injection valves face challenges in maintaining accuracy of the injection hole shape due to variations in nozzle body thickness, leading to inconsistent spray patterns and atomization, particularly when the injection hole shape changes complexly along its axis.
Innovation Solution
A fuel injection valve design featuring a nozzle body with an injection hole having a flat or elliptical perpendicular cross-section that maintains a consistent shape and area ratio from inlet to outlet, facilitating machining and reducing spray shape inaccuracies by stabilizing the inlet cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the injection hole shape changes complexly along its axis to improve spray pattern, then spray atomization is enhanced, but manufacturing precision deteriorates due to difficulty in maintaining consistent shape accuracy
Solution Approach 1:
The patent applies parameter changes by transitioning from a complex three-dimensional varying cross-section to a simplified flat cross-section geometry. This parameter simplification maintains the essential spray function while dramatically improving manufacturability and shape consistency, resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent employs curvature principles by defining the injection hole with a flat cross-section that has controlled radial and axial dimensions. This geometric simplification using flat surfaces and controlled curvature replaces complex three-dimensional variations, enabling precise manufacturing while maintaining effective spray atomization
2Ease of manufacture
If the injection hole has a complex three-dimensional shape to optimize spray pattern, then atomization is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent changes the geometric parameters from complex three-dimensional variations to a flat cross-section with controlled radial and axial dimensions. This simplification makes the injection hole much easier to machine with conventional tools while ensuring consistent spray pattern reliability through precise dimensional control
Solution Approach 2:
The patent segments the injection hole geometry into distinct controllable dimensions: a flat cross-section area, radial thickness, and axial length. This segmentation allows each parameter to be independently controlled and manufactured, improving ease of manufacture while maintaining spray consistency
3Manufacturing precision
If the injection hole cross-section varies along its axis to control spray penetration, then spray distribution is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent changes the cross-sectional geometry from varying three-dimensional shapes to a consistent flat cross-section throughout the injection hole axis. Spray penetration is controlled not by cross-sectional variation but by the controlled radial thickness and axial length parameters, thereby maintaining manufacturing precision while achieving ease of operation for penetration control
Data Source
AI summary
A nozzle body has an injection hole configured to inject fuel and a fuel passage connecting to the injection hole. A needle is configured to open and close the fuel passage to switch between fuel injection from the injection hole and stop of the fuel injection. An injection hole axis is an imaginary line extending along a center of the injection hole. An injection hole perpendicular cross section is a cross section of the injection hole perpendicular to the injection hole axis. The injection hole perpendicular cross section has a flat shape. The injection hole perpendicular cross section has an area that gradually expands from an inlet of the injection hole to an outlet of the injection hole while maintaining a similar shape.