Fuel Filter Retention Arms Snap Into Housing Lip
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Solution Overview
Problem
Existing fuel filter cartridges for diesel engines face challenges in securely attaching the filter element to the housing without adhesives, complicating the manufacturing process and potentially leading to inadequate retention forces, which can result in poor filtration and damage from contaminants like water and abrasive particles.
Innovation Solution
A fuel filter element with resilient retention arms and barbs that snap into an annular lip on the cartridge housing, providing a strong mechanical connection without adhesives, allowing for pre-manufactured filter elements and streamlined assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to secure the filter element within the housing, then the filter element can be retained, but the cartridge manufacture is complicated and requires adhesive curing time
Solution Approach 1:
The patent replaces the chemical adhesive bonding system with a mechanical retention system. The filter element includes retention arms with barbs that engage with corresponding features in the housing, providing secure mechanical retention without requiring adhesives. This substitution eliminates the complexity of adhesive application and curing processes while maintaining reliable filter element retention.
Solution Approach 2:
The patent extracts the adhesive from the manufacturing process entirely. By designing the filter element with integrated retention arms and barbs that mechanically engage with the housing, the invention removes the need for adhesive materials, adhesive application steps, and curing time, thereby simplifying the overall manufacturing process.
2Reliability
If adhesive is used to secure the filter element, then retention is achieved, but assembly time increases due to adhesive curing requirements
Solution Approach 1:
The mechanical retention system with retention arms and barbs provides immediate retention upon assembly, eliminating the time required for adhesive curing. The filter element can be installed and become functional without waiting for chemical bonding to occur, significantly reducing total assembly time.
Solution Approach 2:
The retention arms and barbs are pre-formed as integral parts of the filter element during its manufacturing process. This preliminary formation of retention features allows the filter element to be ready for immediate mechanical engagement with the housing, eliminating the need for subsequent adhesive application and curing steps.
3Ease of manufacture
If a mechanical retention system with retention arms is used, then adhesive is eliminated and manufacturing is simplified, but the structure becomes more complex
Solution Approach 1:
The patent merges the retention function directly into the filter element structure by integrating retention arms and barbs as integral components. This consolidation eliminates the need for separate adhesive materials and application processes, simplifying the overall manufacturing system even though the filter element itself has added structural features.
Solution Approach 2:
The filter element is designed to be self-retaining through its integrated retention arms and barbs that automatically engage with the housing upon installation. This self-service retention mechanism eliminates the need for external adhesive materials and complex assembly processes, making the manufacturing system simpler despite the enhanced filter element structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures reliable filtration and robust mechanical retention, simplifying the manufacturing process and eliminating adhesive use, while maintaining effective filtration performance across varying pressure conditions.
Implementation Method 1
A plurality of resilient filter element retention arms extend axially from the main body portion
Implementation Method 2
a continuous ring of filter media attached between the two end caps
Data Source
Figure 1
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Figure 3
AI summary
A filter cartridge has a longitudinal axis. A cartridge housing has first and second shell portions. The first shell portion has a cartridge housing opening and an annular element retention lip which is disposed axially inward of the opening and coaxial with the longitudinal axis. The filter element has a first end cap, a second end cap, and a continuous ring of filter media disposed between the first and second end caps. The first end cap defines a fuel flow port which is coaxial with the longitudinal axis. A plurality of resilient element retention arms extend axially from the first end cap, and surround the fuel flow port. The arms terminate in retention barbs which are mateable with the annular lip. The resilient retention arms hold the retention barbs against the annular lip, suspending the filter element within the cartridge.