Fuel Injection Valve Anchor Fluid Path Design
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Solution Overview
Problem
Conventional fuel injection valves experience unsatisfactory responsivity due to fluid resistance in the anchor's fuel path, leading to slow valve opening and closing speeds.
Innovation Solution
A fuel injection valve design with a through hole in the anchor, where the opening part is positioned to oppose the fuel introduction bore of the stationary core, and a fuel introduction part is provided to guide fuel smoothly through the hole, reducing fluid resistance and enhancing movement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fuel path is used in the anchor, then the structure is simple, but fluid resistance increases and valve responsivity deteriorates
Solution Approach 1:
The fuel path in the anchor is segmented into multiple channels: a central axial through-hole and peripheral radial through-holes. This segmentation divides the fuel flow into multiple streams, reducing fluid resistance in each individual path while maintaining structural simplicity through symmetric arrangement of the holes.
Solution Approach 2:
The invention transitions from a conventional single-dimension fuel path to a multi-dimensional configuration by adding radial through-holes perpendicular to the axial direction. This creates a three-dimensional fuel distribution network within the anchor, allowing fuel to reach the magnetic attraction gap from multiple directions simultaneously, thereby reducing overall fluid resistance.
2Productivity
If the through hole length is reduced, then fluid resistance decreases and fuel flow improves, but the anchor structural integrity may be compromised
Solution Approach 1:
Instead of one long axial through-hole that would compromise structural strength, the fuel path is segmented into multiple shorter holes: one axial hole and several radial holes. Each hole is shorter and thus less detrimental to structural integrity, while collectively they provide efficient fuel flow paths with reduced fluid resistance.
Solution Approach 2:
The anchor structure employs different hole configurations at different locations: the central axial hole provides main fuel supply, while peripheral radial holes provide supplementary flow paths. This local differentiation optimizes fuel distribution efficiency while maintaining overall structural strength through strategic hole placement and sizing.
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 significantly improves the responsivity of valve opening and closing, shortening valve closing lag time and minimizing fluid resistance, allowing for quicker fuel movement and reduced minimum controllable fuel injection quantities.
Implementation Method 1
an electromagnetic coil is provided for applying a magnetic flux to a magnetic path including the magnetic attraction gap
Data Source
AI summary
In a fuel injection valve used for an internal combustion engine, a valve closing lag time due to fluid resistance in a fuel path is shortened to decrease a minimum injection limit. More specifically, in the fuel injection valve in which an anchor is attracted to an end face part of a stationary core having a fuel path formed at a center part thereof by means of electromagnetic force, and in which a fuel injection hole is opened and closed by controlling a valve disc driven in conjunction with the anchor, there are provided a fuel reservoir part at a center part of an upper end face part of the anchor, a through hole extending axially in a fashion that an end part thereof is open to the fuel reservoir part, and a fuel path extending radially outward from the fuel reservoir part so that fuel is fed to a magnetic attraction gap between an upper end face part of the anchor and a lower end face part of the stationary core. Further, an opening part of a through hole that is open to an upper end face part of the anchor is at least partially opposed to a fuel introduction bore formed in the stationary core, and on the opening part of the through hole, a fuel introduction part is provided for capturing fuel running radially outward from a center side part of the anchor and for guiding the fuel thus captured to the through hole.