Gas Sensor Attachment Screw Segmentation for Mounting Stability
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Solution Overview
Problem
Existing gas sensors with protective covers and cylindrical attachment screws face instability in securing the sensor body to the mounting portion due to conflicting fastening forces between the protective cover and the sensor body, making it difficult to achieve a required degree of power for both components.
Innovation Solution
A gas sensor design featuring a sensor body with a flange that protrudes outwardly and is retained between the bearing surface and attachment screw, with the protective cover secured closer to the base end side than the external thread, allowing the attachment screw to engage the internal thread securely and hold the flange between the screw and bearing surface, ensuring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the protective cover is secured to the attachment screw, then the protective cover is protected from external factors, but the sensor body cannot be firmly secured to the mounting portion due to conflicting fastening forces
Solution Approach 1:
The attachment screw is divided into functionally distinct segments: an external thread portion for securing the sensor body to the mounting portion, and a base end portion for securing the protective cover. This segmentation allows independent optimization of fastening forces for each component, resolving the conflict between protective cover protection and sensor body securing stability.
Solution Approach 2:
The flange protruding from the sensor body acts as an intermediary element that is retained between the bearing surface of the mounting portion and the external thread portion of the attachment screw. This intermediary structure provides a stable mounting interface that distributes fastening forces, enabling both the protective cover and sensor body to be securely fastened without force conflicts.
2Strength
If increasing fastening power for the protective cover, then the protective cover is securely attached, but the fastening power for the sensor body decreases
Solution Approach 1:
The attachment screw is segmented into distinct functional zones: the external thread portion dedicated to sensor body fastening and the base end portion dedicated to protective cover fastening. This spatial segmentation of fastening functions allows independent application of optimal fastening forces to each component, eliminating the trade-off between protective cover strength and sensor body securing stability.
Solution Approach 2:
The problem transitions from a one-dimensional force conflict along the screw axis to a two-dimensional solution by utilizing different portions of the screw's length. The external thread portion engages with the flange at one location while the base end portion engages with the protective cover at another location, effectively distributing fastening forces across different spatial dimensions of the screw structure.
3Reliability
If increasing fastening power for the sensor body, then the sensor body is firmly secured, but the fastening power for the protective cover decreases
Solution Approach 1:
The attachment screw is divided into functionally independent segments: the external thread portion for sensor body fastening and the base end portion for protective cover fastening. This segmentation enables the sensor body to be firmly secured through the external thread portion without compromising the fastening power available for the protective cover at the base end portion.
Solution Approach 2:
The solution moves from a single-point fastening conflict to a distributed fastening system along the length of the screw. By engaging the sensor body through the external thread portion and the protective cover through the base end portion, fastening forces are applied at different locations along the screw's axial dimension, eliminating the inverse relationship between fastening powers.
Data Source
AI summary
A gas sensor has a structure in which a sensor body is secured to a sensor-mounting member using an attachment screw. The gas sensor is capable of ensuring the stability of installation of a protective cover. The gas sensor includes the sensor body in which a sensor device is disposed and the cylindrical attachment screw disposed on an outer circumference of the sensor body to be rotatable. The gas sensor is secured to the sensor-mounting member which has an internal thread engaging the attachment screw and a bearing surface disposed on a front end side of the internal thread. The sensor body has a flange which protrudes outwardly on the front end side of the attachment screw. The flange held between the bearing surface of the sensor-mounting member and the attachment screw in the axial direction. A protective cover is secured to the attachment screw closer to the base end side than an external thread engaging the internal thread is. The protective cover covers an outer periphery of at least a portion of the sensor body which is closer to the base end side than the sensor-mounting member is.