Gas Sensor Insulator Positioning for Assembly Accuracy
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Solution Overview
Problem
Existing gas sensors for vehicle exhaust systems face challenges in maintaining reliable electrical continuity due to variations in spring load and assembly accuracy issues, particularly as they become smaller in size.
Innovation Solution
The gas sensor design incorporates a positioning structure at the proximal and distal ends of the first and second insulators, which restricts relative movement in the sandwiching and orthogonal directions, ensuring accurate assembly and preventing reductions in spring load, thereby maintaining reliable electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gas sensor is made smaller to improve performance and reduce manufacturing cost, then the size is reduced, but assembly accuracy becomes harder to maintain and electrical continuity reliability deteriorates
Solution Approach 1:
The positioning structures are provided in advance on the insulators before assembly, pre-establishing the correct spatial relationship between components. This preliminary positioning ensures that even in compact designs, parts align correctly during assembly, maintaining manufacturing precision despite reduced sensor size.
Solution Approach 2:
The positioning structures act as intermediary elements between the insulators and other sensor components. These intermediaries facilitate accurate alignment and assembly, enabling compact sensor design while maintaining the necessary assembly accuracy for reliable electrical continuity.
2Volume of moving object
If the gas sensor is made smaller, then the size is reduced, but the spring load consistency deteriorates leading to defective electrical continuity
Solution Approach 1:
The positioning structures are pre-configured on the insulators to establish correct component placement before the contact member applies spring load. This preliminary positioning ensures consistent spring load distribution across assembly batches, preventing electrical continuity defects even in compact sensors.
Solution Approach 2:
The positioning structures serve as intermediary elements that mediate between the contact member's spring load and the sensor element. They ensure the spring load is applied consistently and correctly, maintaining reliable electrical continuity in compact sensor designs.
3Manufacturing precision
If positioning structures are added to restrict insulator movement, then assembly accuracy improves, but device complexity increases
Solution Approach 1:
The positioning function is segmented into separate positioning structures that are integrated with the insulators. This segmentation allows the positioning function to be added without fundamentally redesigning the entire sensor structure, minimizing the increase in device complexity while achieving improved assembly accuracy.
Solution Approach 2:
The positioning structures are merged with the insulator components rather than being separate additions. This integration achieves the positioning function with minimal structural complexity, as the positioning features become part of the existing insulator geometry.
Data Source
AI summary
The gas sensor includes a sensor element, a first insulator inside which the sensor element is inserted, a second insulator disposed on a proximal side of the first insulator so as to cover a proximal side of the sensor element, and a contact member held by the second insulator and sandwiching the sensor element. A proximal end portion of the first insulator and a distal end portion of the second insulator abut on each other in an axial direction. Each the proximal end portion and the distal end portion is provided with a positioning structure. The positioning structure is configured to restrict a relative movement between the first and second insulators in a sandwiching direction in which the sensor element is sandwiched by the contact member and in an orthogonal direction perpendicular to the sandwiching direction and in the axial direction.