Tire Pressure Sensor Holding Structure with Integrated Elastic Rotation Restriction
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Solution Overview
Problem
The existing holding structures for tire air pressure detecting devices increase manufacturing costs due to machining requirements and lack stability in rotation restriction.
Innovation Solution
A holding structure that includes a screw shaft, a fixing nut, a holding sleeve, an elastic member, and a rotation restricting portion, where the elastic member is sandwiched between the tire air pressure detecting device and the device supporting portion, and the rotation restricting portion is integrated into the elastic member to restrict rotation and enhance holding force, reducing component count and machining work.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutout portion is formed in a metal thread cutting sleeve to restrict rotation, then the tire air pressure detecting device is prevented from rotating, but manufacturing costs increase due to machining work
Solution Approach 1:
The rotation restricting portion is integrated into the elastic member that already exists in the assembly, combining the rotation restriction function with the existing elastic support function. This eliminates the need for a separate metal component with cutout portions, reducing machining work and manufacturing costs while maintaining rotation restriction capability
Solution Approach 2:
The patent replaces expensive metal machining with a cost-effective elastic member made from elastomeric material. The elastic member serves as a disposable or replaceable component that provides rotation restriction without requiring precise machining operations, significantly reducing manufacturing costs
2Reliability
If the rotation restricting portion is made from metal with cutout portions, then rotation can be restricted, but scraping and wear occur reducing stability
Solution Approach 1:
The patent changes the material parameter from metal to elastomeric material for the rotation restricting portion. This material substitution eliminates scraping and wear issues associated with metal-on-metal or metal-on-plastic contact, providing stable rotation restricting force throughout the service life without degradation
Solution Approach 2:
The elastic member is made from composite or elastomeric material that combines flexibility for mounting with sufficient structural integrity for rotation restriction. This material choice provides both the mechanical properties needed for rotation restriction and resistance to scraping and wear over time
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 reduces manufacturing costs, stabilizes the rotation restricting force, and minimizes wear and deformation, providing a strong holding force while preventing scraping of the rotation restricting portion.
Implementation Method 1
an elastic member (45) which is sandwiched between the tire air pressure detecting device (23) and a device supporting portion (60) including at least one of the fixing nut (44), the holding sleeve (50) and the wheel rim (30) in an axial direction of the screw shaft (43)
Data Source
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AI summary
A holding structure of a tire air pressure detecting device includes a tire air pressure detecting device (23) which is held by a screw shaft (43) of a tire valve (30), a fixing nut (44) which is screwed to the screw shaft (43) and configured to fix the tire valve (40) to a wheel rim (30), a holding sleeve (50) which is screwed to the screw shaft (43) and configured to hold the tire air pressure detecting device (23) on the screw shaft (43), an elastic member (45) which is sandwiched between the tire air pressure detecting device (23) and a device supporting portion (60) including at least one of the fixing nut (44), the holding sleeve (50) and the wheel rim (30) in an axial direction of the screw shaft (43), and a rotation restricting portion (48) which is configured to restrict rotation of the tire air pressure detecting device (23) around the screw shaft (43) between the elastic member (45) and the tire air pressure detecting device (23).