Rotatable Filter Outlet Fitting with Locking Tabs
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Solution Overview
Problem
Existing filter housings with axial outlet fittings are prone to undesirable rotation during shipping and operation, leading to potential decoupling of engine intake air filtration systems, compromising the integrity of the filtration process.
Innovation Solution
The filter apparatus features a connection fitting with retention tabs and a retention flange that allows for rotational alignment during assembly, locking the outlet fitting into a fixed position relative to the filter housing, ensuring the intended rotational alignment is maintained and preventing unwanted rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outlet fitting is secured to the filter housing in a snap-in relation, then the fitting can be easily installed and removed, but the fitting remains rotatable relative to the housing after installation
Solution Approach 1:
The retention feature is divided into multiple discrete tabs spaced around the circumferential perimeter. Each tab can independently engage with corresponding features on the housing, allowing the fitting to be rotated to different positions during installation while still achieving secure retention. This segmentation enables both ease of installation and rotational stability.
Solution Approach 2:
The retention tabs are positioned at specific asymmetric locations around the circumferential perimeter rather than being uniformly distributed. This asymmetric arrangement creates predetermined rotational positions where the tabs engage with corresponding features on the housing, preventing unwanted rotation while still allowing easy installation at these discrete positions.
2Adaptability or versatility
If the outlet fitting is allowed to rotate during shipping and installation, then it can be positioned at different orientations, but engine vibration can lead to undesirable rotation during vehicle operation
Solution Approach 1:
The retention tabs are pre-positioned on the housing at specific locations that correspond to desired rotational positions of the outlet fitting. During installation, the fitting is rotated to align with these pre-positioned tabs, which then engage to lock the fitting in the correct orientation. This preliminary positioning prevents unwanted rotation during operation while still allowing flexible positioning during installation.
Solution Approach 2:
The retention tabs act as intermediary elements between the outlet fitting and the housing. These tabs provide discrete engagement points that allow the fitting to be positioned at specific orientations during installation, then prevent unwanted rotation during operation by mechanically blocking rotational movement at these predetermined positions.
3Adaptability or versatility
If multiple retention tabs are provided around the circumferential perimeter, then the fitting can be locked at multiple rotational positions, but the complexity of the retention mechanism increases
Solution Approach 1:
The multiple retention tabs around the circumferential perimeter serve multiple functions: they provide several predetermined rotational positions for the outlet fitting, ensure secure retention at each position, and distribute mechanical loads across multiple engagement points. This multi-functionality achieves versatility without proportionally increasing complexity, as the same basic tab structure serves all these purposes simultaneously.
Data Source
AI summary
A filter apparatus includes a filter housing having at least one opening and a plurality of retention tabs positioned proximate to at least one of the openings and secured to the filter housing. Also included is a connection fitting having a tube segment sized and configured to be received into at least one opening of the filter housing, orientation tab or tabs secured to the connection fitting and positioned to be engageable between a portion of the plurality of retention tabs when in the installed position. A retention flange extends radially from the tube segment and is configured to retentively engage with the retention tabs to secure the connection fitting to the filter housing. The connection fitting is rotatable when the tube segment is received into the filter housing but is then rotationally locked relative to the filter housing when in the installed position.