Fuel Injection Valve Support Structure Rotation Locking
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Solution Overview
Problem
The conventional support structure for fuel injection valves allows relative rotation between the valve and the elastic support member, leading to unstable fuel injection direction and combustion state in engines.
Innovation Solution
A support structure with a pair of contact surfaces on the fuel injection valve and an elastic support member featuring a base plate, elastic pieces, and rotation locking pieces that prevent rotation and ensure accurate positioning, using a reaction force to clamp the valve between the engine and fuel supply cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a plate spring in U-shape is used as an elastic support member, then the structure is simple, but the fuel injection valve can rotate about its center axis during engine operation
Solution Approach 1:
The elastic support member is divided into multiple functional segments: a base plate for mounting, elastic pieces for providing support force, and rotation locking pieces for preventing rotation. This segmentation allows each component to perform its specific function effectively while maintaining overall structural simplicity.
Solution Approach 2:
Rotation locking pieces act as intermediary elements that engage with positioning grooves on the fuel injection valve. These locking pieces serve as mediators between the elastic support member and the valve, preventing relative rotation without adding complex mechanical structures.
2Stability of the object's composition
If rotation locking pieces are added to prevent rotation, then the fuel injection direction is stabilized, but the structure becomes more complex
Solution Approach 1:
The rotation locking pieces are integrally formed with the base plate of the elastic support member, merging the support function and rotation prevention function into a single unified component. This reduces the number of separate parts and simplifies the overall structure while achieving the desired stability.
Solution Approach 2:
The elastic pieces are designed as thin, flexible components that can deform elastically to provide support force while accommodating minor misalignments. This flexibility allows the structure to maintain simplicity while effectively preventing rotation through the rigid locking pieces.
3Manufacturing precision
If positioning grooves are formed on contact surfaces, then the attached posture of the elastic support member is stabilized, but the manufacturing process becomes more complex
Solution Approach 1:
Positioning grooves are pre-formed on the contact surfaces of the fuel injection valve during the valve manufacturing process. This preliminary action ensures that when the elastic support member is assembled, the rotation locking pieces automatically engage with these pre-existing grooves, achieving precise positioning without requiring additional complex assembly steps.
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 solution stabilizes the fuel injection direction, prevents axial displacement, and maintains a constant positional relation between the fuel supply cap and the elastic support member, ensuring accurate pressing and long-term support of the fuel injection valve.
Implementation Method 1
an elastic piece (16) extending from the base plate (15), elastically coming into pressure contact with the fuel supply cap (Da), and biasing the fuel injection valve (I) against the engine with a reaction force resulting from the contact
Data Source
AI summary
In a fuel injection valve support structure, a pair of contact surfaces are formed on an intermediate portion of the valve so as to be opposite to each other with a plane therebetween, the plane including a center axis of the valve and a center line of a coupler, the elastic support member includes a base plate placed on a second load receiving portion, an elastic piece extending from the base plate, coming into pressure contact with a fuel supply cap elastically, and biasing the valve against an engine by a reaction force resulting from the contact, and a pair of rotation locking pieces extending from the base plate and coming into contact with the respective contact surfaces to restrict rotation of the valve about the axis, and at least one of the contact surfaces has a positioning groove for elastically engaging corresponding one of the rotation locking pieces.