Filter Cartridge Seal Structure for Error-Proof Installation
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Solution Overview
Problem
There is a need for easy installation of the correct filter element in complex filter housing designs, especially when geometry and positioning of other vehicle/engine components impose constraints, and to prevent the installation of the wrong filter element.
Innovation Solution
The air filter cartridge features a seal member with a generally polygonal shape and a seal support arrangement, including support members that are aligned with the flat sides of the seal member, allowing for precise alignment and installation, while the seal member is unsupported at the corner portions to facilitate sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex filter housing design is used to accommodate boundary conditions from vehicle/engine components, then the filter housing can fit the geometric constraints, but the installation of the filter element becomes difficult and error-prone
Solution Approach 1:
The seal member is designed with an asymmetric polygonal cross-section that corresponds to the asymmetric housing seal surface. This asymmetric geometry provides inherent alignment features that guide the filter element into the correct position during installation, eliminating the need for complex alignment procedures while maintaining adaptability to the housing geometry.
Solution Approach 2:
The seal member incorporates pre-formed alignment features and geometric constraints that automatically position the filter element correctly as it is inserted into the housing. The preliminary design of the seal-housing interface ensures that the filter element self-aligns during installation, preventing incorrect installation before the filter is fully seated.
2Strength
If the seal member is fully supported by support members, then the structural strength is improved, but the sealing performance at corner portions deteriorates
Solution Approach 1:
The support members are strategically positioned to provide localized support only at specific regions of the seal member, such as at the midpoints of flat sides, while deliberately leaving the corner portions unsupported. This local differentiation allows the supported regions to maintain structural strength while the unsupported corner regions can deform to conform to the housing seal surface, ensuring reliable sealing at these critical locations.
Solution Approach 2:
The seal member is designed with dynamic characteristics that allow it to deform elastically during installation and operation. The unsupported corner portions can flex and adapt to the housing seal surface geometry, while the supported regions maintain their structural integrity. This dynamic behavior enables the seal member to transition from a rigid supported state to a compliant sealing state at the corners.
Data Source
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AI summary
A filter cartridge can include a media pack including media extending between a first end and a second end along a longitudinal axis; an end cap secured tot the media and including: a seal member presenting a radially inward or outward facing seal surface, the seal member being formed from a first material; and a support structure including a base part and a plurality of spaced apart, radially flexible extensions, the support structure being formed from a second material harder and/or stiffer than the first material, wherein at least a portion of the base part is covered by and/or embedded within the first material, the plurality of flexible extensions including an exposed portion that is uncovered by and/or embedded within the first material and that defines an axial end of the cartridge and is coincident with a radial innermost portion of the end cap; wherein the seal surface and the exposed portion of the flexible extensions are axially aligned such that a plane orthogonal to the longitudinal axis can pass through the seal member and through the exposed portion of the plurality of flexible extensions.