Snap-in Water Sensor for Fuel Filter Housing
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Solution Overview
Problem
Existing engine fluid supply systems face challenges in securing water sensors to filter housings effectively, particularly in preventing water and fuel leakage, due to difficulties in forming threads and inconsistent spin welding with molded plastic components.
Innovation Solution
A snap-fit connection is used to securely attach the water sensor to the filter housing, eliminating the need for traditional methods like threads or spin welding, and ensuring a watertight seal with a sealing ring and insertion stop mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods such as threads or spin welding are used to secure the sensor to the filter housing, then the connection may provide some retention, but the manufacturing process becomes complex and inconsistent when working with molded plastic components
Solution Approach 1:
The connection system is divided into separate components: a sensor body with an external protrusion and a filter housing with a corresponding recess and snap-fit features. This segmentation allows each component to be manufactured independently using molded plastic, avoiding the complexity of forming threads or performing spin welding on the plastic housing while ensuring reliable connection through the snap-fit engagement between the protrusion and recess.
Solution Approach 2:
The patent replaces traditional mechanical connection methods (threads requiring tap holes or spin welding) with a snap-fit mechanical system that integrates directly into the molded plastic components. The snap-fit connection uses elastic deformation of the housing material to create a secure mechanical interlock with the sensor protrusion, eliminating the need for secondary manufacturing operations on the plastic housing.
2Object-affected harmful factors
If a watertight connection is ensured between the sensor and filter housing, then leakage is prevented, but the assembly complexity increases
Solution Approach 1:
The patent combines the mechanical connection function and the sealing function into a single integrated snap-fit assembly. The snap-fit connection members not only provide mechanical retention but also compress a sealing ring to create a watertight barrier. This merging of functions eliminates the need for separate sealing components and assembly steps, reducing overall device complexity while ensuring leakage prevention.
Solution Approach 2:
A sealing ring is introduced as an intermediary element between the sensor body and the filter housing. This sealing ring is compressed by the snap-fit connection during assembly, creating a flexible barrier that prevents water and fuel leakage. The intermediary seal allows the rigid snap-fit connection to achieve a watertight seal without requiring precise machining or complex assembly procedures.
3Strength
If threads are formed in the filter housing for sensor mounting, then a secure connection can be achieved, but the manufacturing process becomes difficult when the housing is made from molded plastic
Solution Approach 1:
Instead of forming threads in the filter housing (which is difficult with molded plastic), the patent inverts the approach by providing a protrusion on the sensor body that fits into a recess in the housing. The snap-fit connection members are formed on the housing to engage with the protrusion, reversing which component requires the complex geometric feature. This inversion allows the housing to be molded with simple recesses and snap-fit features rather than requiring difficult thread formation.
4Reliability
If spin welding is used to secure the sensor, then attachment can be achieved, but the process becomes inconsistent
Solution Approach 1:
The snap-fit connection features (protrusion on sensor, recess and snap-fit members on housing) are pre-formed during the molding process of each component. This preliminary action eliminates the need for post-molding operations like spin welding, which are prone to inconsistency. The components are designed to self-align and self-secure through the snap-fit mechanism during a simple insertion operation, ensuring consistent attachment without requiring precise control of welding parameters.
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
The snap-fit connection provides a reliable and consistent attachment of the water sensor to the filter housing, preventing leakage while facilitating assembly and use in various engine fluid filtration systems, including fuel filter assemblies.
Implementation Method 1
A snap-fit connection is utilized to secure the water sensor to the filter housing
Data Source
AI summary
An improved water sensor and method for retaining a water sensor to a filter housing are described herein. A snap-fit connection is utilized to secure the water sensor to the filter housing. In one embodiment, the snap-fit connection is achieved using non-metallic components.