Fuel Injection Valve Relative Movement Core Needle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel injection valves driven by electromagnetic force have limited moving speed of the needle valve in the separating direction, resulting in insufficient fuel supply and larger particle diameter of fuel injected, due to the lack of relative movement between the movable core and needle valve, leading to a complex structure with unnecessary elastic members.
Innovation Solution
A fuel injection valve design allowing relative movement between the movable core and needle valve, with engagement parts defined by inner and outer faces, enabling the movable core to be restricted in both seating and separating directions, and utilizing an electromagnetic driving portion and biasing portion to enhance the moving speed of the needle valve by applying magnetic attraction and momentum forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If relative movement is prohibited between movable core and needle valve, then the structure is simpler, but the moving speed of needle valve is limited and fuel injection performance deteriorates
Solution Approach 1:
The patent applies the dynamics principle by allowing relative movement between the movable core and needle valve through engagement parts. The movable core and needle valve are connected via engagement parts that permit relative motion in the separating direction while maintaining connection, enabling the needle valve to achieve higher moving speeds through the combined effect of magnetic attraction force and momentum force from the movable core's movement.
2Productivity
If magnetic attraction force is applied to movable core only, then the control is simpler, but the needle valve moving speed is insufficient for adequate fuel supply
Solution Approach 1:
The patent applies preliminary action by pre-positioning the engagement parts on both the movable core and needle valve before operation. The engagement parts are designed in advance to automatically engage and transmit the momentum force from the movable core to the needle valve during the injection process, ensuring that the force transmission mechanism is ready and does not hinder the rapid response required for efficient fuel supply.
3Speed
If the movable core is restricted from moving in separating direction, then the needle valve follows the movable core movement, but the needle valve moving speed is limited
Solution Approach 1:
The patent applies dynamics by implementing selective movement restriction through engagement parts. The engagement parts allow relative movement between the movable core and needle valve in the separating direction, enabling the needle valve to achieve higher speeds. The restriction is dynamically applied only when necessary to maintain proper engagement and ensure reliable force transmission, rather than being a static constraint.
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 achieves accurate and efficient fuel injection with a simpler structure by increasing the moving speed of the needle valve in the separating direction, reducing the ratio of fuel with larger particle diameter, and maintaining stable fuel supply by ensuring the needle valve follows the movement of the movable core.
Implementation Method 1
The electromagnetic driving portion generates magnetic attraction force to attract the movable core in the separating direction by being supplied with electricity
Implementation Method 2
The biasing portion contacts and biases the movable core in the seating direction
Data Source
AI summary
A fuel injection valve includes a needle valve having an engagement part, and a movable core having an engagement part to be engaged with the engagement part of the needle valve. One of the engagement part of the needle valve and the engagement part of the movable core is defined by two inner faces of a recess opposing to each other in an axis direction, and the other engagement part is defined by two outer faces of a projection opposing to the inner faces, respectively. The projection is movable between the inner faces in the axis direction in a state that the projection is located in the recess.