Fuel Injection Valve Spacer Gap Control
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Solution Overview
Problem
Conventional fuel injection devices experience dimensional errors in the gap between the valve body and intermediate member, leading to variations in fuel injection amounts due to sticking issues during valve opening operations.
Innovation Solution
A fuel injection device configuration featuring a nozzle holder, fixed core, anchor, and valve member with a plunger rod and spacer, where the spacer forms a predetermined gap with the anchor, ensuring line or point contact to prevent sticking and stabilize valve operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is formed between the valve body and intermediate member in conventional fuel injection devices, then the valve opening operation can be enabled, but dimensional errors in the gap size cause variations in fuel injection amounts
Solution Approach 1:
The patent introduces a magnetic field as an intermediary force to act on the valve body through the gap between the valve body and intermediate member. The magnetic field can penetrate the gap and exert force on the valve body without requiring direct mechanical contact, thereby enabling valve opening operation while being insensitive to dimensional variations in the gap size.
2Measurement precision
If the valve body and intermediate member are in close proximity to enable precise fuel injection, then injection precision is improved, but the components become stuck during valve opening operation
Solution Approach 1:
The patent replaces the mechanical contact-based valve opening mechanism with a magnetic field-based actuation system. The magnetic field exerts force on the valve body through the gap without requiring mechanical contact between the valve body and intermediate member, eliminating the sticking problem while maintaining precise control over fuel injection amount.
3Stability of the object's composition
If the gap between valve body and intermediate member is reduced to minimize fluid force fluctuations, then fuel injection consistency is improved, but dimensional errors have greater impact on valve operation
Solution Approach 1:
The magnetic field serves as a mediator that transmits force through the gap without being significantly affected by its dimensional variations. This allows the gap to be made smaller for improved fuel injection consistency while the magnetic field actuation remains effective despite manufacturing tolerances in the gap size.
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 configuration effectively suppresses variations in fuel injection amounts by maintaining consistent valve operations and reducing fluid force fluctuations, enhancing the reliability of the fuel injection process.
Implementation Method 1
a magnetic core, an anchor attracted by the magnetism of the magnetic core
Data Source
AI summary
A fuel injection device includes a nozzle holder; a fixed core; an anchor; and a valve member. The valve member has a plunger rod and a spacer. The plunger rod is provided with a shaft portion, and an engaging portion that engages with the anchor during a valve opening operation. The spacer has an accommodating portion in which the engaging portion is accommodated and forms a predetermined gap between the engaging portion and the anchor when the valve is closed. Further, the accommodating portion and the engaging portion are in line contact or point contact.