Fuel Injection Valve Sealing with Segmented Inner and Outer Surfaces
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Solution Overview
Problem
Existing fuel injection valves for internal combustion engines face challenges in sealing fuel and coolant lines, leading to leakage issues.
Innovation Solution
The design incorporates separate sealing surfaces for fuel and coolant lines, with inner and outer sealing surfaces separated by recesses to trap and drain leaks effectively, allowing for improved sealing and leakage reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sealing surfaces for fuel and coolant lines are implemented, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing surface is segmented into distinct inner sealing surfaces for fuel lines and outer sealing surfaces for coolant lines, separated by recesses. This segmentation allows independent sealing for each fluid type, preventing cross-contamination and improving overall sealing reliability while maintaining clear functional differentiation.
Solution Approach 2:
Different regions of the sealing surface are assigned different qualities and functions. The inner sealing surfaces are optimized for fuel sealing with specific geometric characteristics, while outer sealing surfaces are designed for coolant sealing. Each region has tailored properties suited to its specific sealing requirements.
2Object-generated harmful factors
If recesses are added to trap and drain leaks, then leakage reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The recesses are segmented into distinct regions corresponding to fuel line leakage and coolant line leakage. This segmentation allows for targeted drainage paths for each fluid type, improving leakage management while maintaining clear separation of functions throughout the structure.
Solution Approach 2:
The recesses act as intermediary structures between the sealing surfaces and the external environment. They provide a controlled pathway for leakage, allowing fluids to be trapped and drained in a managed manner rather than allowing uncontrolled leakage, while serving as intermediate elements in the manufacturing process.
3Reliability
If multiple sealing surfaces are provided on end faces, then sealing performance is improved, but device complexity increases
Solution Approach 1:
Multiple sealing surfaces are segmented into inner and outer sealing surfaces separated by recesses on the end faces. This segmentation provides distinct sealing pathways for fuel and coolant lines, improving sealing performance by preventing interference between different fluid sealing zones while maintaining organized structural differentiation.
Solution Approach 2:
The sealing surfaces are arranged in multiple dimensions on the end faces, with recesses creating depth separation between inner and outer sealing zones. This dimensional arrangement allows multiple sealing functions to coexist on a single end face without interference, improving sealing performance while organizing complexity through spatial differentiation.
Data Source
Figure 1
Figure 2~3
AI summary
A fuel injection valve (10) with a nozzle body (11) accommodating a nozzle needle (14), wherein at least one fuel supply line (15) is incorporated into the nozzle body, opening into a pressure chamber (16) that partially surrounds the nozzle needle (14), with a nozzle holder (12) wherein at least one fuel supply line (17) is incorporated into the nozzle holder, communicating with a respective fuel supply line (15) of the nozzle body, and with a clamping nut (13) by means of which the nozzle body and nozzle holder are axially clamped. Communicating coolant supply lines (22) and coolant outlets (23) are incorporated into the nozzle body (11) and nozzle holder (12).An outer sealing surface (25) and at least one inner sealing surface (26), separated from the outer sealing surface by at least one recess (24), are formed on the end face (11a) of the nozzle body (11) and/or on the end face (12a) of the nozzle holder (12) adjacent to the end face (11a) of the nozzle body (11). The respective inner sealing surface (26) seals the respective communicating fuel supply lines (15) in the area of the adjacent end faces, and the respective outer sealing surface (25) seals the respective communicating coolant lines (22, 23) in the area of the adjacent end faces. Fig. 1.