Circular Snap Fit Pressure Sensor Unit Sealing
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Solution Overview
Problem
Conventional pressure sensor units in vehicles face manufacturing challenges, reliability issues, and increased costs due to complex mounting processes and large package sizes, which hinder efficient sealing and stress on plastic housings.
Innovation Solution
A circular snap fit pressure sensor unit is designed, incorporating a base assembly with a locking feature and a gasket, along with a housing assembly that uses a sealing feature to compress the gasket, allowing for improved sealing, reduced package size, simplified manufacturing, and lower costs, while ensuring secure orientation and watertight environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional mounting methods are used, then sensors can be mounted on printed circuit boards, but manufacturing complexity and costs increase
Solution Approach 1:
The patent combines the sensor, gasket, and mounting features into a single integrated circular housing assembly. The sensor is directly mounted within the housing structure, eliminating the need for separate printed circuit board mounting and reducing the number of assembly steps. This integration directly addresses the contradiction by simplifying the overall manufacturing process while maintaining functional complexity.
Solution Approach 2:
The circular housing assembly serves multiple functions simultaneously: it provides structural support, sealing through the gasket, sensor mounting, and stress distribution. This multi-functionality reduces the need for separate components and simplifies the manufacturing process, resolving the contradiction between ease of manufacture and device complexity.
2Volume of moving object
If conventional sensor packaging is used, then supporting electronics can be included, but package size increases
Solution Approach 1:
The sensor and supporting electronics are nested within the circular housing structure. The gasket is positioned between the housing and base assembly, creating a compact nested arrangement that minimizes overall package size while accommodating all necessary components. This nesting principle directly reduces volume while managing structural complexity.
3Reliability
If printed circuit board mounting is used, then sensors can be securely mounted, but reliability issues arise from mounting stresses
Solution Approach 1:
The gasket acts as a flexible element that distributes mounting stresses uniformly across the housing structure. This flexible component absorbs stress variations and prevents stress concentration that would compromise reliability, directly addressing the contradiction between mounting reliability and stress resistance.
4Reliability
If conventional sealing methods are used, then sensors can be protected, but sealing performance decreases
Solution Approach 1:
The gasket provides localized sealing quality at the critical interface between the housing and base assembly. By concentrating sealing functionality in this specific location with a dedicated gasket component, the design achieves high sealing performance without requiring complex sealing structures throughout the entire assembly.
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 circular snap fit pressure sensor unit achieves enhanced sealing performance, reduced manufacturing complexity and costs, lower stress on plastic components, and a secure interface, enabling efficient mass production with minimal equipment investment and short cycle times.
Implementation Method 1
The sealing feature (a) may mate with the bearing feature and (b) may compress the gasket in the compression region
Implementation Method 2
The sensor (a) may seal to the central region of the gasket
Data Source
AI summary
An apparatus includes a base assembly, a gasket and a housing assembly. The base assembly may have a locking feature and a bearing feature. The locking feature may have a first passage in communication with an exterior of the apparatus. The gasket may be mounted on the base assembly and may have (i) a compression region, (ii) a central region and (iii) a second passage in communication with the first passage. The housing assembly may have a sealing feature and may be configured to hold a sensor. The sealing feature (a) may mate with the bearing feature and (b) may compress the gasket in the compression region. The sensor (a) may seal to the central region of the gasket and (b) may be in communication with the exterior of the apparatus through the first passage and the second passage.