Filter Element Keyed Axial Projections for Tool-less Installation
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Solution Overview
Problem
Existing filter apparatuses for engine fuel and lubrication systems are inadequate in ensuring proper installation, preventing contamination, facilitating tool-less replacement, and maintaining environmental safety, particularly in dirty environments.
Innovation Solution
A filter element with inner and outer tubular-shaped media packs and a keyed axial projection system that ensures proper alignment and locking, combined with a flow control valve and fluid drain mechanism, to prevent contamination and facilitate easy replacement without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a filter element is made removable and replaceable, then ease of servicing is improved, but the risk of improper installation and contamination increases
Solution Approach 1:
The filter element incorporates asymmetric keyed axial projections and corresponding keyed recesses in the filter base that create a unique asymmetric mating interface. This asymmetric design ensures that the filter element can only be installed in the correct orientation, preventing improper installation while maintaining ease of replacement. The asymmetric keying mechanism provides positive engagement confirmation during installation.
Solution Approach 2:
The patent introduces an intermediary sealing mechanism and alignment feature between the filter element and filter base. The keyed axial projection acts as an intermediary alignment element that guides proper positioning, while the sealing surface provides an intermediary barrier that prevents contamination during the removal and replacement process, thereby ensuring reliability while maintaining serviceability.
2Object-affected harmful factors
If the filter apparatus includes provisions for draining fluid and preventing leakage, then environmental safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the drainage function and leakage prevention function into an integrated sealing and drainage system. The keyed axial projection mechanism simultaneously provides alignment, sealing, and drainage control. The sealing surface integrated into the keyed structure prevents leakage while the drainage passage integrated into the same structure enables fluid drainage, combining multiple functions into a single integrated mechanism that reduces overall device complexity.
Solution Approach 2:
The keyed axial projection and corresponding keyed recess structure serves multiple functions: it provides mechanical alignment during installation, ensures proper positioning of the filter element, creates a sealing interface to prevent leakage, and enables controlled drainage of fluid. This multi-functional design achieves environmental safety through a single integrated mechanism rather than requiring separate components for each function.
3Manufacturing precision
If keyed axial projections are used to ensure proper alignment, then manufacturing precision is improved, but ease of manufacture decreases
Solution Approach 1:
The alignment mechanism is segmented into discrete keyed axial projections on the filter element and corresponding keyed recesses in the filter base. This segmentation allows each component to be manufactured independently with standard tolerances, while the interlocking key features ensure precise alignment during assembly. The segmented design simplifies manufacturing compared to monolithic precision-machined alignment features.
Solution Approach 2:
The keyed axial projection system provides self-aligning functionality during assembly. The asymmetric keys automatically guide the filter element into the correct position and orientation within the filter base, eliminating the need for complex external alignment fixtures or procedures. This self-service alignment mechanism achieves high manufacturing precision while maintaining ease of manufacture through simple, standard manufacturing processes.
Data Source
AI summary
A fluid filtering apparatus and method may include keyed components to ensure that a correct filter element is being installed into a filter base, and to automatically actuate a fluid valve as the filter element is rotated into place on the base. Tool-less replacement of the element is provided. An embodiment of the element may include inner and outer substantially tubular-shaped media packs disposed about an axis, with one end of each of the inner and outer media packs being attached to an end cap of the element in a manner defining a fluid flow space between the inner and outer media packs for receiving a flow of fluid directed in parallel through the inner and outer media packs. A housing of the filter apparatus may include a flow tube configured to fit into the space between the inner and outer media packs.