Filter Locking Ring Mechanism for Assembly Verification
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Solution Overview
Problem
Fuel filters with an inlet in the filter head can lead to turbulent fuel-air mixtures, reducing filtering efficiency due to air not easily rising and being expelled, and there is a risk of assembling the filter without a filter media, allowing unfiltered fuel to pass through.
Innovation Solution
A locking ring mechanism with composite bayonet connector ribs that ensure the filter element is correctly seated, preventing assembly without the media and enhancing filtering efficiency by allowing air to settle and be extracted from the fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fuel inlet is positioned in the filter head, then the filter structure is simplified and easier to manufacture, but air cannot easily rise to the top of the filter making it harder to separate air from fuel
Solution Approach 1:
The filter is divided into distinct functional zones: a water collection zone at the bottom, a filter media section in the middle, and an air venting pathway at the top. This segmentation allows fuel to enter from the top, pass through the filter media, and collect water at the bottom while air can escape through dedicated venting paths, resolving the contradiction between simplified structure and effective separation.
Solution Approach 2:
The patent introduces a vertical dimension for air escape by providing air venting pathways that extend from the filter media through the filter head to the exterior. This creates a three-dimensional separation system where fuel flows downward, water collects at the bottom, and air escapes upward through dedicated channels, effectively solving the air-fuel separation problem while maintaining structural simplicity.
2Device complexity
If the filter head can be coupled to the filter bowl without a filter element, then the coupling mechanism is simpler, but unfiltered fuel can pass through causing damage to the fuel system
Solution Approach 1:
The coupling mechanism includes a filter element presence detection feature that prevents the filter head from being coupled to the filter bowl unless the filter element is properly inserted. This preliminary check blocks the harmful action of assembling without filtration, ensuring that the coupling can only occur when the filter element is in place and functional.
Solution Approach 2:
The filter element acts as an intermediary component that mediates between the filter head and filter bowl. The coupling mechanism is designed so that the filter element physically connects the two halves, and its presence is required for proper engagement. This intermediary role ensures that unfiltered fuel cannot bypass the filtration system.
3Ease of repair
If the filter element is easily removable for replacement, then maintenance is simpler, but the risk of incorrect assembly increases
Solution Approach 1:
The coupling mechanism employs asymmetric features such as cam-locked connectors or bayonet-style fasteners that can be easily opened but can only be closed in the correct orientation. This asymmetric design allows simple removal for maintenance while preventing incorrect reassembly, as the components will not engage properly if misaligned.
Solution Approach 2:
The coupling mechanism includes positive feedback features such as audible clicks, visual indicators, or mechanical detents that confirm when the filter element is correctly assembled. This feedback system provides immediate information to the user that proper assembly has been achieved, reducing the risk of incorrect installation while maintaining ease of replacement.
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 locking ring mechanism ensures the filter is assembled with the media in place, reducing the risk of unfiltered fuel and improving filtering efficiency by allowing proper separation and flow of air and fuel.
Implementation Method 1
a filter media extending between the first end cap and the second end cap defining a central cavity
Implementation Method 2
the fuel fills the bowl from the bottom upwards such that any air present floats above the fuel
Data Source
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AI summary
In a first embodiment there is disclosed a locking mechanism for a filter. The locking mechanism comprises a locking rib (30) which is couplable to a filter media (10). When the locking rib (30) is coupled to a filter media (10) and the filter media (10) is located within a first filter body component (4) the locking rib (30) is arranged to cooperate with a corresponding rib (32) extending from the first filter body component (4) or a second filter body component (48) to form a composite bayonet connector rib (44). The composite rib (44) can engage a bayonet connector slot (52) within the other of the first or second filter body components (4, 48) to couple the filter body components (4, 48) together to surround the filter media (10). In a second embodiment there is disclosed a filter element (2) comprising a first end cap (6), a second end cap (8), a filter media (10), a centre tube (20) and a locking ring (12). The filter media (10) extends between the first and second end caps (6, 8) defining a central cavity (86). The first end cap (6) has an opening (18) into the central cavity (86). The centre tube (20) defines a passageway through the filter element (2) from the first end cap (6) to the second end cap (8). The locking ring (12) is spaced apart from the first end cap (6) by support ribs (18). The filter element (2) defines a fluid flow path extending through the centre tube (20), through the filter media (10) and through the central cavity (86) to the opening (18) into the central cavity (86).