Fuel Injection Valve Bouncing Suppression via Local Rigidity Gradient
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Solution Overview
Problem
Fuel injection valves experience uncontrollable fuel injection due to bouncing of the valve element after collision with the valve seat, which is not effectively suppressed by existing structures with separate movable and valve elements.
Innovation Solution
A fuel injection valve design incorporating a valve element with a vibration absorbing part of reduced axial rigidity between the urging force transmission surface and the valve seat, where the rigidity on either side of the valve element's center of gravity is differentiated to promote anti-phase vibration, thereby suppressing bouncing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve element is made rigid to ensure stable contact with the valve seat, then sealing reliability is improved, but bouncing occurs due to elastic deformation after collision
Solution Approach 1:
The valve element incorporates a lower rigidity part with reduced rigidity per axial unit length between the urging force transmission surface and the seat part. This creates a gradient in rigidity properties: the lower rigidity part absorbs collision energy through controlled deformation, while the seat part maintains sufficient rigidity for stable sealing contact, thereby suppressing bouncing without compromising sealing reliability
Solution Approach 2:
The invention changes the rigidity parameter of the valve element by introducing a lower rigidity part with reduced rigidity per axial unit length. This parameter modification allows the valve element to exhibit different mechanical behaviors in different regions: the lower rigidity part deforms to absorb energy and suppress bouncing, while the seat part maintains high rigidity for reliable sealing
2Measurement precision
If the movable iron core and valve element are separated to reduce initial energy, then fuel injection precision is improved, but bouncing caused by elastic deformation of the valve element persists
Solution Approach 1:
The valve element incorporates a lower rigidity part with reduced rigidity per axial unit length between the urging force transmission surface and the seat part. This creates a gradient in rigidity properties: the lower rigidity part absorbs collision energy through controlled deformation, while the seat part maintains sufficient rigidity for stable sealing contact, thereby suppressing bouncing without compromising sealing reliability
Solution Approach 2:
The invention introduces dynamic characteristics to the valve element through the lower rigidity part, which allows controlled elastic deformation during collision. This dynamic behavior absorbs impact energy and reduces the bouncing phenomenon, while the overall structure maintains the separation between movable iron core and valve element for precise fuel injection control
3Manufacturing precision
If the valve element has high rigidity to maintain structural stability, then manufacturing precision is improved, but bouncing increases due to greater elastic energy storage during collision
Solution Approach 1:
The valve element incorporates a lower rigidity part with reduced rigidity per axial unit length between the urging force transmission surface and the seat part. This creates a gradient in rigidity properties: the lower rigidity part absorbs collision energy through controlled deformation, while the seat part maintains sufficient rigidity for stable sealing contact, thereby suppressing bouncing without compromising sealing reliability
Solution Approach 2:
The valve element is segmented into different rigidity zones: a lower rigidity part with reduced rigidity per axial unit length and a seat part with higher rigidity. This segmentation allows each part to perform its specific function: the lower rigidity part absorbs collision energy to suppress bouncing, while the seat part maintains structural stability and manufacturing precision
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
The design effectively suppresses bouncing of the valve element, ensuring precise fuel injection quantity control and reducing uncontrollable fuel injection, wear, and noise, while improving engine responsiveness and reducing harmful emissions.
Implementation Method 1
a coil configured to generate electromagnetic force for moving the movable iron core
Implementation Method 2
the magnetic attraction force is generated between a fixed iron core and a movable iron core
Implementation Method 3
when the magnetic attraction force becomes smaller than elastic force of an elastic member urging the valve element
Implementation Method 4
the valve element is rendered elastic under the influence of kinetic energy conserved in a valve closing process and thus undergoes elastic deformation
Data Source
AI summary
An object of the present invention is to provide a fuel injection valve configured to suppress bouncing of a valve element that is caused as a result of the valve element being rendered elastic when the valve element collides with a valve seat.The fuel injection valve of the present invention includes the valve element configured to come into contact with the valve seat for closing an injection hole and to separate from the valve seat for unclosing the injection hole, an elastic member urging the valve element toward the valve seat, a movable iron core disposed to be in and out of contact with the valve element, a fixed iron core disposed to be opposed to the movable iron core, and a coil configured to generate electromagnetic force for moving the movable iron core. At least one lower rigidity part having reduced rigidity per axial unit length is provided between a surface where urging force of the elastic member is transmitted to the valve element and a seat part whereat the valve element comes into contact with and separates from the valve seat.