Hydraulic Filter Cartridge Asymmetric Stem Lock
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Solution Overview
Problem
Existing filter cartridges in hydraulic systems become clogged over time, requiring frequent replacement and lack efficient serviceability mechanisms.
Innovation Solution
A serviceable filter cartridge with a liquid filter assembly featuring a guide channel arrangement, axial stem with locker engagement tip, and a lock arrangement that ensures proper orientation and securement within the filter bowl, allowing for easy installation and removal without compromising the system's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If filter cartridges are designed for easy removal and replacement, then ease of operation is improved, but reliability may worsen due to potential improper installation
Solution Approach 1:
The filter cartridge features an asymmetric axial stem with a guide channel arrangement that only engages with the cover member in one specific rotational orientation. This asymmetric design ensures the cartridge must be installed in the correct orientation, preventing improper installation while maintaining ease of replacement through the simple engagement mechanism.
Solution Approach 2:
The guide channel arrangement acts as an intermediary mechanism between the axial stem and the cover member. The guide channels provide a mechanical interface that guides the axial stem into proper engagement, ensuring correct orientation during installation while facilitating easy removal when the cover is opened.
2Ease of manufacture
If filter cartridges are made disposable and simple in design, then ease of manufacture is improved, but loss of substance increases due to frequent replacement
Solution Approach 1:
The filter system is segmented into a reusable cover member assembly and a replaceable filter cartridge. This segmentation allows the cartridge to be designed simply for easy manufacturing and quick replacement, while the reusable cover minimizes overall material consumption. The cartridge can be rapidly exchanged without replacing the entire filter assembly, reducing waste.
Solution Approach 2:
The filter cartridge is pre-assembled with the axial stem and guide channel arrangement during manufacturing, so that during maintenance, only the cartridge needs to be replaced rather than assembling multiple components on-site. This preliminary assembly reduces the time and complexity of replacement operations, minimizing hydraulic fluid loss during maintenance.
3Reliability
If lock arrangements are added to prevent improper installation, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking function is merged with the axial stem structure itself through the guide channel arrangement. Rather than adding a separate locking mechanism, the guide channels are integrated into the axial stem, combining the positioning and locking functions into a single structural element. This maintains reliability while minimizing additional complexity.
Data Source
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AI summary
A filter cartridge can be used in a filter assembly for a system in an in tank filter for a hydraulic return filter. The filter assembly includes a safety construction to ensure that a cover is not place over the bowl of the filter assembly, without a filter cartridge mounted therein. The safety construction includes a lock arrangement on the cover member arrangement, cooperating with a flange on the tank. Methods of servicing use steps to lock and unlock the lock arrangement.