Fuel Injection Valve Guide Structure for Stable Timing Under High Pressure
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Solution Overview
Problem
High fuel pressure increases the valve closing force in conventional fuel injection valves, requiring a large valve opening force to maintain efficient fuel injection, and existing solutions like the core boost structure suffer from variations in valve opening and closing timing, leading to inconsistent fuel injection amounts due to wear and tilting issues.
Innovation Solution
A fuel injection valve design incorporating a spring member, a valve closing force transmission member, and a guide member with a recessed surface to manage the valve closing force, reducing wear and tilting, and ensuring consistent valve operation by controlling the movement of the valve closing force transmission member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high fuel pressure is used to improve injection efficiency, then fuel injection performance is improved, but valve closing force increases requiring larger valve opening force
Solution Approach 1:
The valve closing force transmission path is segmented into multiple components: the valve body, the valve closing force transmission member with cylindrical portion, and the guide member. This segmentation allows the force to be transmitted through a structured path that reduces wear and tilting, enabling the system to handle high fuel pressure effectively while maintaining consistent valve operation.
Solution Approach 2:
The valve closing force transmission member acts as an intermediary between the spring member and the valve body. It includes a cylindrical portion that contacts the guide member, mediating the transmission of valve closing force and reducing direct contact wear between the spring member and valve body, thereby maintaining force transmission efficiency under high pressure conditions.
2Power
If the valve closing force transmission member directly contacts the guide member, then force transmission is efficient, but wear and tilting occur causing inconsistent valve timing
Solution Approach 1:
The guide member includes a recessed surface that is recessed outward in the radial direction to enlarge the gap between the guide member and the valve closing force transmission member. This beforehand cushioning design prevents direct contact and wear by maintaining an optimized gap, allowing smooth movement of the cylindrical portion while preventing tilting and ensuring consistent valve timing over extended operation.
3Device complexity
If the gap between guide member and valve closing force transmission member is small, then structural compactness is achieved, but wear increases causing tilting and timing variations
Solution Approach 1:
The guide member features a locally optimized recessed surface with a specific gap distance in the radial direction. This local quality modification allows the structure to maintain compactness overall while creating a specific region with optimized clearance to prevent wear and tilting, ensuring precise valve timing without compromising structural integrity.
4Ease of operation
If the cylindrical portion moves freely radially, then ease of assembly is improved, but movement control deteriorates causing inconsistent valve operation
Solution Approach 1:
The guide member's recessed surface dynamically controls the radial movement of the cylindrical portion. The enlarged gap allows sufficient radial movement freedom for assembly and operation while preventing excessive movement that would cause tilting. This dynamic balance ensures consistent valve operation throughout the component's service life.
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 enhances the consistency of fuel injection by reducing wear and tilting, thereby minimizing variations in fuel injection amounts and improving the timing accuracy of valve opening and closing, even under high fuel pressure conditions.
Implementation Method 1
a spring member that is elastically deformed by the valve opening operation of the valve body and exerts a valve closing elastic force
Implementation Method 2
a fixed core that generates a magnetic attraction force upon energization of a coil
Data Source
AI summary
A fuel injection valve includes a valve body, a fixed core, a movable core, a spring, a cup, and a guide. The cup contacts the spring and the valve body to transmit a valve closing elastic force to the valve body, and includes a cylindrical portion having a cylindrical shape. The guide has a sliding surface on which an outer peripheral surface of the cylindrical portion slides so as to guide the movement of the cylindrical portion in an axial direction while restricting the movement of the cylindrical portion in a radial direction. The guide has a recessed surface connected to the sliding surface and recessed to increase a gap between the recessed surface and the cup in the radial direction.