Fuel Injection Valve Mushroom-Shaped Intermediate Member
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Solution Overview
Problem
Existing fuel injection valves for internal combustion engines face challenges in simplifying construction while reliably controlling the opening movement of the injection valve member and ensuring rapid closing, with complex designs that can lead to inefficiencies and increased wear.
Innovation Solution
A fuel injection valve design featuring a hydraulic control device with a mushroom-shaped intermediate valve member, compression spring, and an electrically activated actuator assembly, which includes annular sealing faces and a throttle passage to control the axial movement of the injection valve member, allowing for precise control and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tight sliding fit is used for the shaft in the guiding recess to improve sealing, then sealing properties are improved, but wear and manufacturing complexity increase
Solution Approach 1:
A compression spring is introduced as an intermediary element between the intermediate valve member and the guiding recess. The spring provides continuous axial force that presses the intermediate valve member against the guiding recess, creating reliable sealing without requiring a tight sliding fit. This mediator transfers the sealing function from the sliding interface to the spring-pressure interface, reducing wear and manufacturing complexity while maintaining sealing effectiveness.
2Measurement precision
If the shaft is guided in a tight sliding fit to improve control precision, then control precision is improved, but speed and reliability deteriorate due to increased wear
Solution Approach 1:
The mechanical sliding fit system is replaced with a spring-loaded pressing system. Instead of relying on friction and tight clearance for control precision, the compression spring provides controlled axial force that maintains precise positioning of the intermediate valve member relative to the guiding recess. This substitution eliminates the wear inherent in tight sliding fits while preserving control precision through elastic force rather than mechanical interference.
3Reliability
If a complex hydraulic control device is used to improve valve control, then control reliability is improved, but device complexity increases
Solution Approach 1:
The complex hydraulic control device is extracted and replaced with a simplified spring-based mechanical control system. The essential control function—regulating axial movement of the injection valve member—is achieved through the compression spring's axial force rather than through complex hydraulic mechanisms. This extraction removes unnecessary complexity while retaining the core control reliability needed for precise fuel injection timing and valve operation.
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 enhances the precision and speed of fuel injection by minimizing fuel ingress and leakages, reducing wear, and enabling a more compact construction with improved sealing properties, facilitating rapid valve opening and closing.
Implementation Method 1
a compression spring which impinges the injection valve member with a closing force directed in the direction towards the injection valve seat
Implementation Method 2
a hydraulic control device for controlling the axial movement of the injection valve member by varying the pressure in a control chamber
Data Source
AI summary
The fuel injection valve has a hydraulic control device for controlling the axial movement of the injection valve member. The stem of the intermediate valve member of mushroom-shaped configuration of the intermediate valve is guided in the guide recess of the intermediate part. In the open position, the intermediate valve member opens up a second connection between a high-pressure fuel inlet and a valve chamber and, in the closed position, the intermediate valve member shuts off the second connection between the high-pressure fuel inlet and the valve chamber. In the closed position of the intermediate valve member, the head of the intermediate valve member lies with a side facing toward the intermediate part against the intermediate valve seat via a first sealing surface, which runs around the stem or the guide recess at a first radial spacing so as to form a first annular sealing surface which is continuous in the circumferential direction.