Fluid Filter Standpipe Locking Tabs Prevent Foreign Insert Installation
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Solution Overview
Problem
Existing fluid filters for internal combustion engines face challenges in preventing the installation of unsuitable filter inserts and ensuring operational reliability while maintaining a simple construction and minimizing production costs.
Innovation Solution
A fluid filter design featuring locking tabs on the standpipe or end piece that are preloaded to lock the end piece in an expelled position, requiring unlocking means for correct engagement, allowing only suitable filter inserts to be installed, with a minimal number of parts for a cost-effective and reliable solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device with multiple individual parts is used to prevent installation of unsuitable filter inserts, then reliability of preventing foreign filter inserts is improved, but device complexity and production cost increase
Solution Approach 1:
The locking device is merged into a single integrated component formed as one piece with the standpipe. The locking tabs are directly formed on the standpipe body, eliminating the need for separate locking mechanism parts. This integration maintains the anti-fraud functionality while significantly reducing part count and assembly complexity.
Solution Approach 2:
The standpipe serves multiple functions: it provides structural support, guides the end piece, and integrates the locking device functionality through formed locking tabs. This multi-functionality reduces the need for separate components and simplifies the overall filter construction while maintaining reliability.
2Reliability
If a locking device with multiple individual parts is used to prevent operation without filter insert, then reliability of preventing operation without filter insert is improved, but production cost increases
Solution Approach 1:
The locking device functionality is merged into the standpipe component itself through integrally formed locking tabs. This eliminates the need for separate locking mechanism parts, reducing assembly steps and production cost while maintaining the reliability of preventing operation without a proper filter insert.
Solution Approach 2:
The locking tabs are automatically engaged when the end piece is properly installed with a suitable filter insert. The system self-locks without requiring additional actuators or complex mechanisms, simplifying manufacturing while ensuring reliable prevention of operation without filter insert.
3Reliability
If locking tabs are preloaded in locking direction, then functional reliability is improved, but force required for installation increases
Solution Approach 1:
The locking tabs are designed to be flexible and movable in the radial direction, allowing them to dynamically adjust during installation. When the end piece is properly inserted, the tabs flex outward to engage the locking positions, providing reliable locking without requiring excessive installation force.
Solution Approach 2:
The locking tabs change their radial position parameter during installation - they are movable in the radial direction to allow engagement, then become fixed in the locked position. This parameter change enables reliable locking while accommodating variations in installation force requirements.
Data Source
AI summary
A fluid filter insert for a fluid filter having a filter housing, a cover and a central standpipe with a locking device preventing a closing of the cover, comprising a hollow cylindrical filter material body, two end plates enclosing said filter material body at its ends, at least one protruding member carried on the filter insert. The filter insert is configured to be placed onto the standpipe, and the protruding member of the filter insert, when the filter insert is placed onto the standpipe, is configured to actuate the locking device in an unlocking direction and allowing a complete placing of the filter insert. When the filter insert is placed onto the standpipe, the protruding member is brought into engagement with the locking device, wherein the locking device is moved in the unlocking direction by the protruding member.