Tire Pressure Sensor Spring Retention for Rim Leakage
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Solution Overview
Problem
Tire pressure monitoring sensors tend to lift or move outward during high-speed wheel rotation due to additional weight and mass, causing air leakage and loss of retention in the wheel rim.
Innovation Solution
Incorporating resilient spring members and spring clips that provide a biasing force against the wheel rim, securing the tire pressure monitoring assembly with a retaining member and spring inserts that expand radially to maintain the sensor's position, preventing undesired movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rubber coated snap-in valve stem is used to mount the sensor, then the installation is simple and the rubber provides initial retention, but during high-speed rotation the sensor lifts or moves outward causing leakage and loss of retention
Solution Approach 1:
The mounting system is divided into multiple functional components: a valve stem for insertion, a separate retaining member for securing, and spring members for providing biasing force. This segmentation allows each component to perform its specific function optimally while working together to solve the retention problem during high-speed rotation.
Solution Approach 2:
Spring members are introduced to provide a biasing force that counteracts the outward movement tendency of the sensor during high-speed rotation. The spring force acts in the opposite direction to the centrifugal force, maintaining reliable retention and preventing leakage.
2Strength
If the sensor is attached with a threaded member, then the connection is secure, but the additional weight and mass cause the sensor to lift or move outward during operation
Solution Approach 1:
Spring members provide a biasing force that counteracts the effect of the sensor's weight and mass during rotation. This allows the use of lighter mounting components while maintaining secure connection, as the spring force compensates for the gravitational and centrifugal forces acting on the sensor.
Solution Approach 2:
The mounting system transitions from static threaded connections to a dynamic spring-based retention system. The spring members can dynamically adjust to the forces during rotation, providing continuous biasing force that maintains secure connection while accommodating the motion and weight variations during operation.
3Device complexity
If the valve stem extends through the wheel rim with minimal retention, then the assembly is simple, but air leakage occurs due to movement and loss of retention
Solution Approach 1:
Spring members provide continuous biasing force against the wheel rim, counteracting any movement tendencies of the valve stem and sensor assembly. This maintains reliable sealing integrity and prevents air leakage without significantly increasing assembly complexity.
Solution Approach 2:
The spring members are pre-loaded to provide biasing force before operation begins. This preliminary anti-action prevents movement and potential leakage from occurring in the first place, rather than correcting problems after they arise, thereby maintaining sealing integrity throughout operation.
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 solution effectively reduces the likelihood of air leakage by providing increased support and retention of the valve stem, ensuring the tire pressure monitoring assembly remains securely mounted during operation.
Implementation Method 1
The spring insert is inserted within the bore of rubber housing and expanded radially upon engagement with a mandrel or the valve body
Implementation Method 2
The radial outward movement of the spring insert causes a corresponding radial expansion of the rubber housing that generates a bias in a direction radially outward against the interior walls of the opening
Data Source
AI summary
A tire pressure monitoring sensor includes resilient spring members to support and resist movement during rotation of the wheel.