Gas Sensor Elastic Insulating Member Heat Erosion
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Solution Overview
Problem
The existing gas sensors are prone to heat erosion of the elastic insulating member due to direct heat conduction from the ceramic housing, leading to potential short circuits and reduced reliability.
Innovation Solution
The gas sensor design includes one or more common spaces on the surface of the elastic insulating member facing the ceramic housing, where two or more lead wires are arranged, reducing heat conduction and preventing temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the end surface of the elastic insulating member is close to the ceramic housing with a large area, then the structural compactness is improved, but heat conduction from the sensor element to the elastic insulating member increases causing temperature rise and heat erosion
Solution Approach 1:
The patent divides the end surface of the elastic insulating member into multiple regions by forming recesses. This segmentation reduces the continuous heat conduction path area while maintaining the overall compact structure. The recesses create isolated zones that limit heat transfer from the ceramic housing to the bulk of the insulating member.
Solution Approach 2:
The patent applies local quality by creating recesses at specific locations on the end surface of the elastic insulating member. These recesses are strategically positioned to interrupt heat flow paths from the ceramic housing, thereby locally reducing heat conduction in critical areas while preserving the overall structural integrity and compactness.
2Ease of operation
If guide portions are separately formed from one end surface to the other end surface, then the lead wire positioning is improved, but the heat conduction path area is increased leading to temperature rise
Solution Approach 1:
The patent segments the guide portions by forming recesses that divide the continuous guide structure into separate zones. This allows lead wires to be positioned and guided effectively while the recesses interrupt the heat conduction paths that would otherwise extend continuously from one end surface to the other.
Solution Approach 2:
The recesses act as intermediary structures between the lead wire guidance function and the heat isolation requirement. They provide the necessary guidance for lead wires while simultaneously serving as heat barriers that prevent direct heat conduction paths.
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 design effectively suppresses temperature rise in the elastic insulating member, reducing the risk of heat erosion and connection failures, while improving heat resistance and reliability.
Implementation Method 1
the heat conducted from the sensor element disposed on the distal side is easily transmitted to the elastic insulating member through the ceramic housing
Data Source
AI summary
A gas sensor includes: a sensor element; a ceramic housing holding a rear end portion of the sensor element and provided with metal terminals electrically connected to the sensor element; and an elastic insulating member that is fixed in the rear of the sensor element and into which a plurality of lead wires electrically connected to the metal terminals are inserted. The elastic insulating member has one or more common spaces formed in a surface of the elastic insulating member that faces the ceramic housing. Two or more of the lead wires are arranged in each common space.