SMA-Reinforced Polymer Structure for Airless Tire Elasticity
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Solution Overview
Problem
Existing technologies for combining metals like steel with rubber for reinforcement in applications such as tires rely on brass-coated chemical bonds, which are limited by the properties of steel and require pneumatic elements, lacking the advantages of shape memory alloys (SMAs) in elasticity and strength.
Innovation Solution
Combining SMAs with polymers to create structures that encapsulate SMA elements within polymers, forming structures with high elasticity and strength without pneumatic elements, using SMA structures like toroidal shapes encapsulated in polyurethane or other polymers, bonded to rubber treads for airless tires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel is used for reinforcement in polymer structures, then strength is improved, but elasticity is limited and pneumatic elements are required
Solution Approach 1:
The patent changes the material parameter from conventional steel to shape memory alloys (SMAs), which possess unique properties including pseudoelasticity that allows for an order of magnitude greater recoverable strain than steel. This parameter change enables the reinforcement element to provide both high strength and superior elasticity without requiring pneumatic elements
Solution Approach 2:
The patent creates a composite structure by bonding SMAs to polymers, combining the high strength of SMAs with the elasticity and flexibility of polymer materials. This composite approach achieves both improved strength and enhanced elastic properties that neither material could provide alone
2Strength
If brass-coating and vulcanizing process is used to bond steel with rubber, then bonding strength is improved, but the process complexity and limitation to specific materials increases
Solution Approach 1:
The patent changes the bonding mechanism from chemical bonding (brass-coating and vulcanizing) to mechanical bonding, where the SMA elements are mechanically attached to the polymer structure. This eliminates the need for complex chemical processes and sulfur compounds, simplifying manufacturing while maintaining strong bonds
Solution Approach 2:
The patent extracts the brass-coating intermediate layer from the bonding process, directly bonding SMAs to polymers without requiring the complex multi-step chemical bonding process involving sulfur compounds. This reduces process complexity and material limitations
3Adaptability or versatility
If pneumatic elements are used in tire structures, then elasticity is improved, but durability in rugged terrains and fuel efficiency deteriorates
Solution Approach 1:
The patent changes from pneumatic elasticity (air pressure) to solid-state pseudoelasticity provided by SMAs. This parameter change eliminates the need for air-filled chambers, resulting in puncture-proof structures with superior durability in rugged terrains while maintaining high elasticity through the SMA's inherent pseudoelastic properties
Solution Approach 2:
The patent eliminates the pneumatic element (pressurized air) from the tire structure, replacing it with solid SMA elements that provide elastic recovery through their pseudoelastic properties. This removal of pneumatic components prevents punctures and improves reliability in harsh environments
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 SMA-polymer combination provides enhanced durability and lower rolling resistance, making them suitable for rugged terrains and environments without air, offering improved fuel efficiency compared to conventional pneumatic tires.
Implementation Method 1
SMAs have a pseudoelasticity that allows for an order of magnitude greater recoverable strain than steel
Implementation Method 2
The SMA structure is encased in a polymer
Data Source
AI summary
Shape memory alloy elements (“SMAs”) are bonded, encased, or encapsulated with one or more polymers to form an integrated component with unique elastic, pseudoelastic, and load-bearing properties.