Fuel Return System Integrated Into Protective Cover
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Solution Overview
Problem
Existing fuel supply systems for motor vehicle combustion engines face issues with fuel leakage due to screw connections on the injection ramp and injectors, leading to potential spills and the need for bulky protective housings that are not suitable for engines with limited space.
Innovation Solution
A protective housing with a fuel return system where the fuel return line is fixed parallel to a flat wall, featuring quick and reversible connections between the pipe and injector tips, allowing for a compact design that reduces assembly time and facilitates easy disconnection for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections are used for fuel supply lines on the injection ramp and injectors, then reliable fluidic sealing can be achieved, but fuel leakage risks increase due to potential connection failures and bulky protective housings are required
Solution Approach 1:
The patent combines the protective housing with the fuel return line into a single integrated component. The housing serves dual functions: protecting the injection system components and providing a mounted fuel return line with quick connection capability, eliminating the need for separate protective housings and reducing overall system complexity
Solution Approach 2:
The fuel return line is designed as a separate, modular component that can be quickly connected and disconnected from the injection ramp. This segmentation allows for easy maintenance and replacement without disturbing other system components, while the integrated housing provides structural support and protection
2Reliability
If traditional screw connections are used for fuel return lines, then secure connections are achieved, but assembly time increases and maintenance becomes more difficult
Solution Approach 1:
The patent employs quick-connect mechanisms that allow the fuel return line to be rapidly attached and detached from the injection ramp. This dynamic connection system replaces traditional screw connections, enabling fast assembly and maintenance operations while maintaining secure fluidic sealing during operation
Solution Approach 2:
The fuel return line is pre-integrated into the protective housing during manufacturing, with connection interfaces prepared in advance. This preliminary preparation allows for rapid field assembly and maintenance operations, as components are ready for quick connection without requiring complex alignment or preparation steps
3Object-affected harmful factors
If protective housings completely cover the injection system, then fuel leakage protection is improved, but the device becomes too bulky for engines with limited space
Solution Approach 1:
The protective housing is designed to provide localized protection only where needed - specifically covering the fuel return connection area and injection components. The housing does not completely enclose the entire injection system, maintaining a compact form factor while providing targeted protection against fuel leakage at critical connection points
Solution Approach 2:
By integrating the fuel return line and connection mechanisms directly into the protective housing structure, the patent eliminates the need for separate protective enclosures. This merging reduces overall volume while maintaining protection functionality, making the system suitable for space-constrained engine installations
Data Source
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AI summary
Fuel return system (10) of a high-pressure fuel supply device of a motor vehicle internal combustion engine, said device being fixed to the upper part of a cylinder head and comprising: - a high-pressure fuel injection rail (12) connected to at least - one fuel injector (11), characterized in that said fuel return system is fixed to a protective cover (17) of the device covering the rail, the at least one injector and all the connections between the injection rail (12) and the at least one injector (11).