Gas Sensor Spacer Prevents Ceramic Housing Biting
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Solution Overview
Problem
Conventional gas sensors face issues where the ceramic housing, when fixed in an inclined state, causes unintended stress on the terminal fitting, leading to a higher likelihood of the terminal fitting breaking upon impact.
Innovation Solution
A gas sensor configuration that includes a spacer between the ceramic housing and the elastic body, with the spacer's front end portion having a Young's modulus of 80 GPa or more to prevent the ceramic housing from biting into the spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ceramic housing is fixed in an inclined state, then the manufacturing process is simplified, but the terminal fitting becomes more prone to breaking under impact
Solution Approach 1:
The patent introduces a spacer as an intermediary component between the ceramic housing and the elastic body. This spacer prevents direct contact and potential biting forces from transmitting to the terminal fitting, thereby maintaining reliability even when the ceramic housing is fixed in an inclined state during manufacturing.
Solution Approach 2:
The patent specifies that the spacer must have a Young's modulus of 80 GPa or more at its front end portion. This parameter change ensures the spacer has sufficient rigidity to resist deformation and prevent the ceramic housing from biting into the elastic body, thus protecting the terminal fitting from stress concentration.
2Ease of operation
If the ceramic housing bites into the elastic body in an inclined state, then assembly is easier, but the terminal fitting is more likely to break
Solution Approach 1:
The spacer acts as a mediator that prevents the ceramic housing from directly biting into the elastic body. By introducing this intermediate component, the assembly process remains easy while the harmful biting forces are eliminated, protecting the terminal fitting from stress-induced breakage.
Solution Approach 2:
The spacer provides beforehand cushioning by absorbing and distributing the forces that would otherwise concentrate on the terminal fitting. Its high Young's modulus ensures it maintains structural integrity under compression, preventing the ceramic housing from deforming the elastic body in a way that would compromise terminal fitting strength.
3Device complexity
If no spacer is used between the ceramic housing and elastic body, then the structure is simpler, but the ceramic housing can be fixed in an inclined state causing stress on the terminal fitting
Solution Approach 1:
The spacer serves as a precision-maintaining intermediary between the ceramic housing and elastic body. It prevents the ceramic housing from being fixed in an inclined state by providing a rigid interface that maintains proper alignment, thereby ensuring manufacturing precision without significantly increasing overall device complexity.
Solution Approach 2:
By specifying the spacer's Young's modulus to be 80 GPa or more, the patent ensures the spacer has sufficient rigidity to maintain alignment precision. This parameter change allows the spacer to resist deformation and prevent the ceramic housing from becoming inclined, thus maintaining manufacturing precision.
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 configuration effectively prevents the ceramic housing from being fixed in an inclined state, thereby reducing the risk of terminal fitting breakage when an impact is applied.
Implementation Method 1
the spacer has Young's modulus of 80 GPa or more at least at a front end portion including an end surface on the front end side
Data Source
AI summary
Provided is a gas sensor that prevents a ceramic housing from biting into a member arranged on a rear end side of the ceramic housing in a state of being inclined from an axial direction. In the gas sensor according to one aspect of the present invention, a spacer having Young's modulus of 80 GPa or more is arranged at least in a front end portion on a rear end side of the ceramic housing to which a terminal fitting is attached.