Gas Sensor Gripping Member Caused Position Shift
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Solution Overview
Problem
Conventional gas sensors experience a reduction in gripping force due to external impacts, which can cause the gripping position to move, especially when the gripping member transitions from the crest portion to the caulked portion on the cylindrical body.
Innovation Solution
The gas sensor design includes caulked portions with inclined and bottom portions, where the gripping member grips the caulked portion closest to the open end, with specific angle ranges (30° to 90°) for the inclined portions to securely fix the gripping position, and the axial length and diameter configurations are optimized to enhance gripping force and prevent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gripping member grips the crest portion of the cylindrical body, then the gripping position is initially stable, but the gripping force reduces when external impact causes the gripping position to move to the caulked portion
Solution Approach 1:
The caulked portion is pre-formed on the cylindrical body before assembly, creating a predetermined gripping position that is optimized for external impact resistance. This preliminary structural preparation ensures that when external impacts occur, the gripping member remains securely positioned on the caulked portion rather than shifting to less stable areas.
Solution Approach 2:
The caulked portion is formed only at specific locations on the cylindrical body where gripping is required, creating localized structural features with different properties from the rest of the cylindrical body. This local quality enhancement provides targeted impact resistance and gripping stability without affecting other parts of the sensor structure.
2Object-affected harmful factors
If the gripping member is positioned on the caulked portion, then external impact resistance is improved, but the gripping position may still move if the caulked portion geometry is not optimized
Solution Approach 1:
The geometry of the caulked portion is optimized by controlling specific parameters: the inclination angle of the inclined portion is set to 30° to 60°, and the axial length ratio between the inclined portion and bottom portion is controlled within specific ranges. These parameter optimizations ensure that the caulked portion provides both external impact resistance and gripping position stability.
Solution Approach 2:
The caulked portion incorporates curved surfaces and rounded transitions rather than sharp angles, creating a smoother geometry that better distributes external impact forces. The curved inclined portion and rounded bottom portion work together to maintain gripping position stability while resisting external impacts.
3Stability of the object's composition
If the inclined portion angle is small, then the caulked portion fits tightly on the cylindrical body, but the gripping position becomes unstable under external impact
Solution Approach 1:
The inclination angle of the caulked portion is optimized to fall within 30° to 60°, which balances two competing requirements: a smaller angle would provide tighter fit but reduce impact resistance, while a larger angle would improve impact resistance but reduce fitting stability. The specified angle range resolves this contradiction by providing both secure fit and external impact resistance.
Solution Approach 2:
The caulked portion is formed through a composite structure combining the cylindrical body material with the caulked material, creating a joint that leverages the properties of both materials. This composite construction enhances both the fitting stability and the resistance to external impacts.
4Force
If the axial length of the gripping member is increased, then the gripping force is enhanced, but the device complexity increases
Solution Approach 1:
Instead of uniformly increasing the gripping member length, the design concentrates the gripping function in the local region where the gripping member contacts the caulked portion. The gripping member is optimized only in the critical gripping zone, maintaining simplicity in non-critical areas while providing sufficient gripping force through localized structural enhancement.
Data Source
AI summary
A possibility is suppressed that a gripping position of a gripping member is moved by an external impact and a gripping force is reduced. In a gas sensor according to one aspect of the present invention, a gripping member that grips a portion covered with a tube in an outer peripheral surface of a cylindrical body such that the tube protrudes to a side opposite to an open end of the cylindrical body grips an outer peripheral surface covered with the tube of a caulked portion closest to the open end among one or more caulked portions formed in the cylindrical body.