Diesel Fuel Filter Double-Lock Cap Anti-Leakage
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Solution Overview
Problem
Conventional diesel fuel filters are prone to fuel leakage due to the lower cap being easily unfastened by impact or vibration during transport or driving, which compromises the integrity of the filtration system.
Innovation Solution
A double-lock structure comprising a double-lock cover and pin is implemented, with a cap gear part and cover gear part having right-angled triangular teeth for secure engagement, and a 'C'-shaped double-lock pin for additional locking, preventing the lower cap from unfastening under external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple fastening structure is used for the lower cap, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates because the lower cap may be easily unfastened due to impact or vibration during transport or driving
Solution Approach 1:
The fastening structure is divided into multiple functional components: a lower cap, a cover with gear-shaped engagement protrusions, and a pin for securing. This segmentation allows each component to perform a specific function while collectively providing robust anti-unfastening protection against vibration and impact during transport and driving.
Solution Approach 2:
The engagement protrusions on both the lower cap and cover are designed with gear-shaped curved surfaces that interlock. This curved geometry provides mechanical advantage and resistance to unfastening forces from vibration and impact, while still allowing for relatively simple manufacturing through molding or machining processes.
2Reliability
If a robust fastening structure with double-lock cover and pin is implemented, then the reliability is improved by preventing unfastening under impact or vibration, but the device complexity increases
Solution Approach 1:
The fastening system is segmented into distinct functional elements (lower cap, cover with gear protrusions, pin) that can be manufactured independently using standard processes, then assembled together. This modular approach achieves high reliability through multiple locking mechanisms while controlling overall complexity through standardized component design.
Solution Approach 2:
The cover serves dual functions: it protects the water discharge passage and simultaneously provides gear-shaped engagement protrusions for anti-unfastening. This merging of protective and locking functions into a single component reduces the number of separate parts needed while maintaining high reliability.
3Ease of operation
If the lower cap is easily unfastened by impact or vibration, then the ease of operation is improved for maintenance purposes, but the harmful factors increase due to fuel leakage
Solution Approach 1:
The gear-shaped curved engagement protrusions provide strong mechanical interlocking that resists unfastening from vibration and impact during normal operation and transport. The curved geometry distributes stress evenly, preventing accidental loosening while still allowing controlled removal with appropriate tools for maintenance when needed.
Solution Approach 2:
The very features that make the fastening robust against vibration and impact (gear-shaped interlocking protrusions) also prevent fuel leakage. The design converts the potential harm of strong fastening (difficulty of removal) into a benefit by making accidental unfastening impossible while still allowing intentional maintenance removal.
Data Source
AI summary
A diesel fuel filter for removing foreign substances and water contained in fuel used in a high-pressure fuel pump upon lubricating and cooling the high-pressure fuel pump is provided. The diesel fuel filter includes a lower cap for draining water including a double-lock cover and a double-lock pin to provide a double-lock structure to prevent fuel leakage caused by unfastening of the lower cap due to impact or vibration during driving of a vehicle.