Fuel Injection Device Gap Forming Member Slide Resistance
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Solution Overview
Problem
Existing fuel injection devices face issues with high slide resistance and uneven wear, leading to unstable needle reciprocation and variations in fuel injection amounts, which can result in operational failures and inconsistent performance.
Innovation Solution
The fuel injection device incorporates a gap forming member with a single slide structure, where only one wall surface slides relative to the flange or stationary core, reducing slide resistance and wear, and employs a coil to accelerate the movable core for high-pressure fuel injection, while a guide stabilizes the needle's reciprocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double slide structure is used in the gap forming member, then the needle reciprocation is guided, but the slide resistance increases and wear occurs
Solution Approach 1:
The patent extracts one of the two sliding surfaces from the gap forming member, leaving only a single sliding surface on the needle. This reduces the number of sliding contacts from two to one, thereby decreasing slide resistance and wear while still providing adequate guidance for needle reciprocation through the remaining single sliding interface.
2Reliability
If a double slide structure is used in the gap forming member, then the needle is supported, but wearing or uneven wearing occurs over time
Solution Approach 1:
The patent removes one sliding interface from the system, reducing the number of surfaces subject to wear. The remaining single sliding surface on the needle provides sufficient support while minimizing cumulative wear damage, thereby extending the service life of the fuel injection device.
3Reliability
If a double slide structure is used in the gap forming member, then the needle reciprocation is guided, but wear debris is generated
Solution Approach 1:
The patent eliminates one sliding contact interface, thereby reducing the sources of wear debris generation. The single remaining sliding surface on the needle still provides adequate guidance for reciprocation while producing significantly less wear debris that could contaminate the fuel injection system.
4Reliability
If a double slide structure is used in the gap forming member, then the needle is supported, but the injection amount varies
Solution Approach 1:
The patent reduces the complexity of the sliding structure from two interfaces to one, minimizing variations in slide resistance that could affect needle motion consistency. This leads to more uniform fuel injection amounts across multiple operations and between different devices.
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 stabilizes needle reciprocation, reduces wear and debris generation, and minimizes variations in fuel injection, ensuring consistent performance and preventing operational failures.
Implementation Method 1
a coil (72), which generates a magnetic field
Implementation Method 2
the movable core (40) is accelerated in the gap and collides against the flange (33) of the needle (30)
Implementation Method 3
a valve seat side urging member (71), which is a spring, is placed on the opposite side of the movable core (40)
Data Source
AI summary
A gap forming member has: a plate portion that is placed on an opposite side of a needle, which is opposite from a valve seat; and an extending portion that is formed to extend from the plate portion toward the valve seat, while an opposite end part of the extending portion, which is opposite from the plate portion, is contactable with a movable core. A first wall surface of the gap forming member, which is a wall surface opposed to an outer wall of the flange, is slidable relative to the outer wall of the flange, and a second wall surface of the gap forming member, which is a wall surface opposed to an inner wall of a stationary core, forms a radial gap, which is a gap in a radial direction, between the second wall surface and the inner wall of the stationary core.