Fuel Filter Wicking Body for Low-Level Suction
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Solution Overview
Problem
Fuel supply systems in motorcycles face difficulties in fuel withdrawal when the fuel level falls below a certain point, especially during significant lateral inclinations, leading to reduced suction capacity and potential air or gas inclusion.
Innovation Solution
A fuel filter with a wicking body and support structure that enhances suction capacity by allowing fuel intake from areas not previously accessible due to distance and height differences, using a spongy material to ensure continuous fluid supply and reduce air or gas inclusion, even during vehicle tilts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fuel filter is used, then the filter structure is simple, but the suction capability deteriorates when fuel level is low or vehicle is tilted
Solution Approach 1:
The patent employs a wicking body made of porous material that utilizes capillary action to draw fuel from the tank bottom to the pump inlet. This porous structure enables the filter to maintain suction capability under low fuel levels and tilted conditions by allowing fuel to travel through the porous matrix against gravity, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The filter element is designed with an extended distal structure that reaches toward the tank bottom, creating a three-dimensional fuel collection geometry. This dimensional extension allows the filter to access fuel from multiple positions and orientations, maintaining suction capability regardless of vehicle tilt or fuel level, thus improving reliability without significantly increasing complexity.
2Reliability
If the fuel level falls below a certain level, then the pump cannot withdraw fuel effectively, but increasing the filter size to reach lower areas may increase device complexity
Solution Approach 1:
The filter structure is segmented into a proximal portion connected to the pump and a distal portion extending toward the tank bottom. This segmentation allows each portion to perform its specific function - the proximal portion filters while the distal portion reaches for fuel - without requiring a completely redesigned complex structure, thus improving fuel withdrawal capability with moderate complexity increase.
Solution Approach 2:
The filter element extends in the vertical dimension toward the tank bottom, allowing it to reach fuel sources that would be inaccessible to a conventional horizontally-oriented filter. This dimensional extension enables reliable fuel withdrawal even when the fuel level is low, addressing the contradiction between reliability and structural complexity.
3Reliability
If the vehicle is subject to lateral inclinations, then fuel suction becomes difficult, but adding complex stabilization mechanisms would increase device complexity
Solution Approach 1:
The wicking body's porous structure allows fuel to move through capillary action rather than relying on gravity alone. This mechanism maintains suction performance during lateral inclinations because capillary forces are independent of vehicle orientation, resolving the contradiction between reliability during tilt and structural simplicity.
Solution Approach 2:
The filter's extended distal structure creates a vertical fuel collection path that remains effective regardless of lateral vehicle inclination. By reaching down toward the tank bottom, the filter ensures continuous fuel supply even when tilted, improving reliability without requiring active stabilization mechanisms that would increase complexity.
4Reliability
If the wicking body is not supported, then the structure is simpler, but the wicking body may collapse under pump depression
Solution Approach 1:
The support structure incorporates curved or tapered geometric features that distribute mechanical loads evenly across the wicking body. This curved geometry prevents collapse under pump depression while maintaining a relatively simple overall structure, resolving the contradiction between structural integrity and device complexity.
Solution Approach 2:
The filter assembly combines the wicking body material with a support structure material, creating a composite system where each material contributes its strengths. The support structure provides mechanical integrity while the wicking material performs its filtration and capillary function, achieving structural reliability without excessive complexity.
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
The solution ensures the fuel pump operates correctly by providing a continuous fluid supply and minimizing air or gas inclusion, even when the fuel level is low and the vehicle is subject to changes in tilt, thus improving the fuel supply system's reliability.
Implementation Method 1
Due to the wicking of the spongy body, it is possible to provide the suction mouth of the pump with a supply of fluid
Data Source
Figure 1
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AI summary
A fuel filter comprising a sleeve (11) adapted to be fastened at a suction end (4a) of a fuel pump (4) and defining a fuel passage opening (11a), an envelope (13) fastened to the sleeve (11) and at least partially formed by a filtering membrane, the filtering membrane comprising a membrane portion (13a) completely covering the fuel passage opening (11a), and a wicking body (15) made of spongy material, housed within the envelope (13) and arranged in such a way as to completely cover the fuel passage opening (11a).