Temperature Sensor Guide Tube Resonance Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Temperature sensors in internal combustion engine pipes face challenges in maintaining high responsiveness while enduring vibrations, as the connecting portion between lead wires and the connector terminal is prone to stress due to resonance, which can deteriorate the sensor's durability and responsiveness.
Innovation Solution
A temperature sensor design featuring a guide tube with insulation properties and a gap between the lead wires and the tube, along with a filler that fixes the temperature sensing part and guide tube, reduces resonance by allowing the lead wires to vibrate within the guide tube, thereby minimizing stress on the connecting portion and maintaining high heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the tip end portion of the temperature sensor is made small in diameter to reduce heat capacity and improve responsiveness, then the responsiveness is enhanced, but the connecting portion between the lead wires and connector terminal becomes weak against vibration
Solution Approach 1:
The guide tube serves as an intermediary structure between the lead wires and the external environment. It provides mechanical support and protection to the connecting portion without interfering with the thermal detection function. The guide tube absorbs and distributes vibration stresses, preventing them from concentrating on the weak connecting portion between lead wires and connector terminal.
2Reliability
If filler is filled into the whole gap inside the cover to fix the lead wires and prevent resonance, then the durability against vibration is improved, but the heat capacity at the temperature detecting portion increases and responsiveness deteriorates
Solution Approach 1:
The guide tube provides localized structural support and resonance prevention at the lead wire connecting portion, while leaving the tip end portion (temperature detecting portion) free from filler material. This local differentiation allows the detecting portion to maintain low heat capacity and high responsiveness, while the protected portion gains vibration resistance.
Solution Approach 2:
The internal space of the cover is segmented into two functional zones: a tip end region filled with filler material for vibration protection, and a base end region left empty to maintain thermal responsiveness. The guide tube further segments the lead wire path, creating isolated spaces that prevent resonance while preserving heat transfer efficiency.
3Speed
If the lead wires are allowed to vibrate freely to maintain low heat capacity, then responsiveness is maintained, but resonance occurs when vibration frequency matches natural frequency, increasing stress on connecting portion
Solution Approach 1:
The guide tube is installed beforehand to provide cushioning and mechanical support to the lead wires. This pre-protection structure prevents resonance amplification by dampening vibrations before they can build up stress on the connecting portion, while still allowing sufficient thermal conduction for responsive temperature detection.
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 enhances durability against vibrations while maintaining high responsiveness by preventing resonance of the lead wires and reducing stress on the connecting portion, ensuring effective temperature detection in vibrating environments.
Implementation Method 1
reduces resonance by allowing the lead wires to vibrate within the guide tube
Implementation Method 2
a filler that directly or indirectly touches the temperature sensing part and a tip end of the guide tube
Implementation Method 3
a guide tube having insulation properties, formed to have larger inner diameter than an outer diameter of each lead wire
Implementation Method 4
a temperature sensing part in which electrical resistance or electromotive force changes depending on the temperature
Data Source
AI summary
A temperature sensor includes: a housing; a connector disposed in the housing; a cover attached to the housing; a temperature sensing part disposed in a tip end portion in the cover, detecting temperature; a pair of lead wires having conductivity, connected to the temperature sensing part and a terminal of the connector; a guide tube having insulation properties, formed to have larger inner diameter than an outer diameter of each lead wire, the guide tube having a gap between each lead wire and the guide tube to cover each lead wire; a filler that directly or indirectly touches the temperature sensing part and a tip end of the guide tube, a tip end region inside the cover being filled with the filler; a space formed in a base end side in a region filled with the filler within the cover.