Fuel Injection Device Yoke Axial Force Control
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Solution Overview
Problem
Existing fuel injection devices struggle to accurately inject high-pressure fuel without experiencing fuel leakage due to stress concentration and shifting of magnetic throttle parts, leading to reduced injection accuracy.
Innovation Solution
The fuel injection device incorporates a yoke that generates a contractile force in the axial direction, reducing the separation force between components and maintaining the magnetic throttle part's position, thereby preventing stress concentration and fuel leakage, and ensuring accurate high-pressure fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the fuel pressure in the fuel passage increases, then the fuel injection device can inject high-pressure fuel, but the welded portion or magnetic throttle part may be broken due to stress concentration
Solution Approach 1:
The patent applies the counterweight principle by introducing a biasing component that generates a biasing force in the axial direction to counteract the separation force generated by high fuel pressure. This balance of forces prevents the magnetic throttle part from detaching from the stationary core, thereby maintaining structural integrity while allowing high-pressure fuel injection.
Solution Approach 2:
The patent implements preliminary anti-action by pre-establishing the biasing force through the biasing component before high-pressure fuel injection occurs. This preliminary counter-force is already in place to oppose the separation force that would otherwise cause failure under high pressure conditions, preventing stress concentration and structural breakdown in advance.
2Stress or pressure
If the fuel pressure excessively increases, then high-pressure fuel injection is achieved, but the magnetic throttle part position shifts in the axial direction, reducing fuel injection accuracy
Solution Approach 1:
The biasing component generates a counteracting biasing force that balances the separation force from high fuel pressure, preventing axial displacement of the magnetic throttle part. This force balance ensures the magnetic throttle part remains in its correct position, maintaining precise fuel injection control even under high-pressure conditions.
Solution Approach 2:
The patent changes the force balance parameter by introducing the biasing force from the biasing component. This parameter change modifies the net force on the magnetic throttle part, transforming it from a state where separation force dominates (causing position shift) to a state where biasing force counteracts separation force (maintaining position stability), thereby preserving injection accuracy.
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 allows for accurate injection of high-pressure fuel while suppressing fuel leakage, maintaining the integrity of the magnetic throttle part and enhancing injection accuracy.
Implementation Method 1
The coil is energized to be able to form a magnetic circuit through the first cylinder part, the movable core, the stationary core, the third cylinder part, and the yoke, and thus able to attract the movable core toward the stationary core
Implementation Method 2
The yoke has a cylindrical shape, of which the first end side is connected to the first cylinder part and the second end side is connected to the third cylinder part, and is provided on a radially outer side of the housing such that an axial force is generated in the first cylinder part and the third cylinder part in the direction in which the first and third cylinder parts approach each other
Data Source
AI summary
The housing includes a first cylinder part having a first end connected to a nozzle, a second cylinder part having a first end connected to a second end of the first cylinder part and forming a magnetic throttle part in at least a part of the second cylinder part in an axial direction, a third cylinder part having a first end connected to a second end of the second cylinder part, and a fuel passage formed inside the first cylinder part, the second cylinder part, and the third cylinder part so as to communicate with injection holes and guide the fuel to the injection holes. A yoke has a cylindrical shape, of which the first end side is connected to the first cylinder part and the second end side is connected to the third cylinder part, and is provided on a radially outer side of the housing such that an axial force is generated in the first cylinder part and the third cylinder part in a direction in which the first cylinder part and the third cylinder part approach each other.