Off-Centre Filter Cartridge Assembly for Leak-Tight Engine Filtration
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Solution Overview
Problem
Existing filter cartridges for internal combustion engines face challenges in secure assembly, particularly with off-center discharge channels, leading to misalignment and potential contamination due to plastic debris and difficulty in recycling composite materials.
Innovation Solution
A filter cartridge design featuring an asymmetrical angular indexing element with a movable slider and pre-stressing mechanism ensures correct angular positioning of the off-center plug, allowing intuitive assembly without mechanical stress on the plug, preventing misalignment and ensuring a leak-tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an off-center discharge channel is used to prevent accidental installation of unsuitable cartridges, then filter housing reusability and environmental friendliness are improved, but cartridge positioning accuracy and sealing reliability deteriorate due to misalignment risks
Solution Approach 1:
The patent employs asymmetry in multiple components: the off-center discharge channel creates an asymmetric housing feature, the plug is positioned eccentrically relative to the cartridge axis, and the indexing element has an asymmetric profile with a first edge portion closer to the flange than a second edge portion. These asymmetric features work together to enable precise angular positioning of the cartridge while maintaining housing reusability.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with a simplified indexing mechanism. Instead of using multiple guides or adjustment mechanisms, a single indexing element with an asymmetric profile engages with the off-center plug and discharge channel to automatically position the cartridge at the correct angle during insertion, eliminating the need for manual alignment procedures.
2Ease of operation
If a rigid plastic tab is used for rotational guidance during assembly, then ease of assembly is improved, but reliability deteriorates due to tab breakage and plastic debris contamination
Solution Approach 1:
The patent changes the mechanical parameters of the indexing element to improve both ease of assembly and reliability. The indexing element features an asymmetric profile with specific edge portions designed to engage with complementary features on the housing, providing robust mechanical guidance without the fragility of thin plastic tabs. The element's geometry is optimized to distribute stresses during insertion.
Solution Approach 2:
The indexing element is designed with features that cushion and distribute the mechanical stresses of assembly before final engagement. The asymmetric profile with differentiated edge portions allows for progressive engagement, where the first edge portion engages earlier in the insertion process to guide alignment, while the second edge portion engages later to secure the final position, preventing sudden stress concentrations that could cause breakage.
3Reliability
If the indexing element is made robust and rigid, then reliability is improved, but ease of operation worsens due to difficulty in achieving correct angular position during insertion
Solution Approach 1:
The indexing element incorporates dynamic characteristics through its asymmetric profile design. The element is rigid enough to provide reliable positioning once engaged, but its asymmetric geometry with differentiated edge portions allows it to naturally guide the cartridge into the correct angular position during insertion. The first edge portion, being closer to the flange, engages first to initiate rotation, while the second edge portion engages later to lock the final position, creating a dynamic insertion process that is both easy to perform and reliable.
Data Source
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AI summary
The invention relates to a cartridge (1) suitable for being installed in a filter housing which has a bottom with an off-centre drainage channel, the cartridge having: an annular filter medium (2) around an axis (Z); a flange (1a) with an opening (30); a plug (12) parallel to the axis (Z) which is connected to the flange and eccentrically protrudes so as to hermetically close off an opening in the channel; and an element (6), which is typically tubular and linearly guided within the hollow (9) in the medium, and which interacts with a protruding tube for the flow of liquid provided in the bottom of the housing. Said element (6) includes an end (6c) with a guided sloping interface that is capable of establishing end-to-end engagement with the protruding tube. The element (6) that is rotatably locked by an internal framework (1c) provides for rotational fool-proofing and is subsequently pushed back when the cartridge is installed in the housing while guiding the off-centre plug (12).