Gas Sensor Heat Dissipating Member Nested Within Tool Engagement Portion
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Solution Overview
Problem
The existing gas sensor design has an increased overall size due to a heat dissipating member with a maximum diameter larger than the tool engagement portion, which complicates the layout of other components in internal combustion engines and the ease of attachment.
Innovation Solution
A gas sensor design with a tubular heat dissipating member that surrounds the outer tube, reducing heat transfer to the sealing member and having a maximum diameter equal to or less than the tool engagement portion, allowing for efficient heat dissipation without increasing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat dissipating member has a maximum diameter larger than the tool engagement portion, then heat dissipation effectiveness is improved, but the overall size of the gas sensor increases
Solution Approach 1:
The heat dissipating member is nested within the confines of the tool engagement portion's opposite side dimension, effectively placing one functional element within the spatial boundaries defined by another structural feature. This allows the heat dissipating member to be positioned such that its maximum diameter does not exceed the tool engagement portion's opposite side dimension, thereby preventing overall size increase while maintaining heat dissipation functionality.
2Object-affected harmful factors
If the heat dissipating member has a larger diameter, then heat transfer reduction to sealing member is improved, but the layout of other engine components becomes more difficult
Solution Approach 1:
The heat dissipating member is constrained to fit within the opposite side dimension of the tool engagement portion, effectively nesting it within the existing spatial envelope of the gas sensor assembly. This prevents the heat dissipating member from protruding beyond the tool engagement portion, thereby maintaining compatibility with standard engine layouts and component spacing requirements.
3Object-affected harmful factors
If the heat dissipating member has a larger diameter, then thermal protection of sealing member is improved, but attachment ease is reduced
Solution Approach 1:
The heat dissipating member is designed with a maximum diameter that does not exceed the tool engagement portion's opposite side dimension, effectively nesting it within the tool engagement boundaries. This ensures that the overall external dimensions of the gas sensor remain unchanged, allowing attachment tools to access and engage with the tool engagement portion without obstruction, thereby maintaining ease of attachment.
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
The reduced size of the gas sensor minimizes its impact on engine layout and attachment ease while effectively dissipating heat, preventing thermal degradation of the sealing member.
Implementation Method 1
Heat transferred from the outer tube of the gas sensor to the connection portion is dissipated from the connection portion to the main portion
Data Source
AI summary
A gas sensor (100) extending in an axial direction AX including: a gas sensor element (120) which detects the concentration of a specific gas in a gas under measurement; a tubular metallic shell (110) having a polygonal tool engagement portion (110B) surrounding the gas sensor element (120); a tubular outer tube (103) which extends rearward from the metallic shell (110), surrounds the gas sensor element (120), and has an opening (103E) at a rear end thereof; a sealing member (191) which seals the opening (103E); and a tubular heat dissipating member (104) which surrounds the outer tube (103) and reduces the amount of heat transferred from the forward end side of the gas sensor (100) through the outer tube (103) to the sealing member (191). The maximum diameter D1 of the heat dissipating member (104) is equal to or less than the opposite side dimension D2 of the tool engagement portion (110B).