Run-Flat Device Segmented Web for Load Distribution
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Solution Overview
Problem
Current run-flat devices, such as solid elastomer and rigid metal designs, face challenges including difficulty in installation, increased weight, harsh ride, limited cushion, and potential damage to vehicles due to stiffness and sudden impacts, as well as limited lifetime due to heat generation in thick sidewall designs.
Innovation Solution
A run-flat device comprising an inner ring, a deformable outer ring, and a flexible interconnected web that connects the two, with a locking mechanism and support elements to distribute load and absorb impact, allowing the device to be inserted into a pneumatic tire to maintain structural integrity and support after a puncture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid elastomer or rigid metal run-flat devices are used, then structural support is provided when the tire loses air pressure, but the ride becomes harsh and the device adds significant weight
Solution Approach 1:
The run-flat device is divided into multiple segments: an inner ring, an outer ring, and a deformable web connecting them. This segmentation allows each component to be optimized independently - the inner ring provides structural support while the deformable web reduces weight and improves ride comfort by absorbing vibrations.
Solution Approach 2:
The deformable web acts as a flexible connecting element between the inner and outer rings. This thin, flexible structure reduces the overall weight compared to solid elastomer or rigid metal designs while still providing the necessary structural support and cushioning during operation.
2Ease of manufacture
If rigid metal designs are used, then assembly is easier, but the device provides little cushion and can cause damage to the vehicle under impact loads
Solution Approach 1:
The deformable web serves as a flexible element that absorbs impact energy and provides cushioning between the rigid inner and outer rings. This prevents the transmission of harmful impact forces to the vehicle suspension while maintaining the ease of assembly associated with modular designs.
Solution Approach 2:
The deformable web is positioned beforehand between the inner and outer rings to provide cushioning against future impact loads. This pre-positioned flexible element absorbs shock energy before it can reach the vehicle suspension system, preventing damage while maintaining structural integrity.
3Reliability
If thick sidewall designs are used, then structural support is provided during pneumatic operation, but the ride becomes harsher and the tire lifetime is limited due to heat generation
Solution Approach 1:
The deformable web acts as a flexible, thin-walled structure that provides structural support without the excessive thickness required by traditional sidewall designs. This reduces heat generation from flexing while maintaining the necessary structural integrity during both pneumatic and run-flat operation.
Solution Approach 2:
The deformable web is designed to dynamically adapt its stiffness based on operating conditions. During normal pneumatic operation, it flexes to provide a comfortable ride, while during run-flat operation, it maintains structural support. This dynamic behavior reduces heat generation and extends tire lifetime compared to static thick sidewall designs.
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 provides improved ride comfort, reduced weight, and extended tire life by distributing loads effectively and absorbing shock, while maintaining structural integrity and supporting the tire after a puncture, thus addressing the limitations of existing run-flat technologies.
Implementation Method 1
A deformable outer ring comprises at least two annular pieces. A flexible interconnected web extends between the inner and outer ring and includes at least two annular pieces
Implementation Method 2
A stop element is positioned between an interface between the at least two annular pieces and the inner ring to limit deflection of the outer ring towards the inner ring
Data Source
AI summary
A run-flat device, which is inserted into pneumatic tires to allow mobility in the event of pressure loss in the pneumatic tire, can comprise an inner ring, outer ring, and an interconnected web connecting the two. The run-flat device can support an applied load by working in tension and compression.