Ratcheting Sensor Housing Cover for Contamination-Resistant Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional snap fit components used for assembling sensor housings can lead to increased contamination risks for electronics, especially in safety-critical applications, due to potential gaps and imprecise sealing.
Innovation Solution
A ratcheting interface system is introduced, featuring a solid barb design on one side and a fixed and free-moving edge design on the other, which engages barbs in one direction and allows slipping over barbs in the other, providing a secure locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor housing is designed to be completely sealed and impermeable to protect internal components, then protection against environmental factors is improved, but the housing becomes susceptible to cracking under stress and requires complex stress relief features
Solution Approach 1:
The housing is divided into two separate portions: a first housing portion and a second housing portion. These portions are joined together to form a complete sealed housing, allowing each portion to be manufactured independently with optimized stress distribution and enabling the housing to be assembled around pre-installed grommets without requiring complex stress relief features in the sealed structure
Solution Approach 2:
A grommet is introduced as an intermediary component between the housing portions and cables. The grommet is installed in a recess of the first housing portion and provides a flexible sealing interface that protects cables from environmental factors while accommodating stress without transmitting it to the housing structure, thereby preventing cracking
2Reliability
If cables are routed through a completely sealed housing, then environmental protection is improved, but cable installation and removal becomes difficult and time-consuming
Solution Approach 1:
The grommet is designed as a flexible, dynamic component that can be compressed during cable installation and then expands to seal around the cable. This flexibility allows cables to be easily installed by compressing the grommet and have them removed by compressing the grommet again, while maintaining environmental protection when the grommet is in its expanded sealed state
Solution Approach 2:
The housing is segmented into portions with a recess that accommodates the grommet, separating the sealing function from the structural housing. This segmentation allows the grommet to provide flexible cable access while the housing portions maintain the sealed environment
3Ease of manufacture
If a single-piece housing design is used, then manufacturing simplicity is improved, but the housing cannot provide effective cable protection and stress relief
Solution Approach 1:
The housing is divided into multiple portions that can be manufactured using simple processes and then assembled. The segmentation allows for the integration of a recess and grommet components that provide effective cable protection and stress relief, which would be difficult to incorporate into a single-piece design
4Ease of operation
If stress relief features are built into a sealed housing, then cable flexibility is improved, but the housing becomes more complex and prone to cracking
Solution Approach 1:
The grommet serves as an intermediary that provides all the necessary stress relief and cable flexibility features. By placing the grommet in a recess of the first housing portion rather than building stress relief features into the housing itself, the housing remains simple in design while the grommet handles cable flexibility and stress accommodation
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A mountable sensor assembly with a ratcheting cover attachment is provided. The sensor assembly may include a sensor circuit, a sensor housing, and a cover. The sensor housing may have walls that define a cavity with an opening for receiving the sensor circuit. The cover may be configured to extend over and seal the opening. The cover may be configured to interface with the walls through a ratcheting mechanism. The ratcheting mechanism may include a plurality of flexible latching fingers that engage solid ridges. The flexible latching fingers have one attached end and one unattached end, such that the flexible latching fingers deflect from the attached end.