Fuel Injection Floating Plate Curved Sealing Response
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Solution Overview
Problem
Existing fuel injection devices face challenges in rapidly opening and closing the valve portion due to difficulties in blocking fuel flow between the pressure control chamber and the fuel inlet and outlet ports, leading to inefficient fuel pressure control and delayed valve operation.
Innovation Solution
The fuel injection device incorporates a nozzle body with a valve member that moves based on control signals, featuring a pressure control chamber with recessed flow-in and flow-out ports, and a floating member with recessed surfaces to enhance the sealing contact with the pressure control surface, allowing for improved fuel pressure control and rapid valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the press-contacting surface of the floating member is formed in a flat shape, then the ease of manufacture is improved, but the reliability of blocking fuel flow deteriorates
Solution Approach 1:
The press-contacting surface of the floating member is changed from a flat shape to a curved shape that corresponds to the curvature of the pressure control surface. This curved configuration enables better conformal contact between the two surfaces, improving the sealing effect and preventing high-pressure fuel from passing through gaps, thereby resolving the reliability issue while maintaining manufacturability.
2Ease of operation
If the surface area of the press-contacting surface is increased, then the ease of operation is improved, but the pressure control capability deteriorates
Solution Approach 1:
Instead of uniformly increasing the surface area, the invention applies local quality by concentrating the contact area at the periphery of the floating member. The press-contacting surface is designed with a curved configuration that concentrates sealing contact at the edges, thereby maintaining high surface pressure for effective fuel flow blocking while preserving operational ease.
3Productivity
If the communication between the fuel outlet port and the fuel return line is opened, then the productivity is improved, but the pressure control capability deteriorates
Solution Approach 1:
The floating member acts as an intermediary mechanism between the fuel outlet port and the fuel return line. When the pressure control valve opens communication between these ports, the floating member's curved press-contacting surface maintains sealing contact with the pressure control surface, preventing high-pressure fuel from bypassing the controlled path. This intermediary sealing mechanism enables both high productivity through open communication and maintained pressure control capability.
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 enables faster and more precise control of the valve portion, ensuring efficient fuel injection by effectively blocking fuel flow and rapidly adjusting fuel pressure, thereby improving the response to control signals.
Implementation Method 1
the press-contacting surface of the floating member is pressed against the pressure control surface, so that communication between the fuel inlet port and the pressure control chamber as well as communication between the fuel inlet port and the fuel outlet port is blocked off
Data Source
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AI summary
The invention has an object for improving response of a fuel injection device . A flow-in recessed portion (72a) and a flow-out recessed portion (74a) are formed at a press-contacting surface of a floating plate (70), which is movably accommodated in a pressure control chamber (53). A flow-in port (52b) and a flow-out port (54b) are formed at a pressure control surface (53b) of a valve body (46). The flow-in port (52b) is opened to the flow-in recessed portion (72a), while the flow-out port (54b) is opened to the flow-out recessed portion (74a). When the floating plate (70) is moved upwardly and the press-contacting surface is brought into contact with the pressure control surface (53b), the flow-in port (52b) is surely closed.