Airless Biodegradable Tire Composition With Shape Memory Scaffold
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Solution Overview
Problem
Conventional automotive tires are unsustainable due to their production methods and require inflation, making them prone to deflation and heat generation, while seeking alternatives that are biodegradable and non-pneumatic for improved durability and environmental sustainability.
Innovation Solution
A biodegradable tire composition incorporating a flax seed material, guayule-derived natural rubber, metal oxide, carbon-based filler, and shape memory alloy scaffold, which forms an airless tire with an elastomeric matrix and hexagonally-shaped cells, providing structural support and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pneumatic tires are used, then they provide adequate performance through inflation, but they are susceptible to deflation and heat generation
Solution Approach 1:
The patent removes the pneumatic air chamber from the tire structure, eliminating the source of deflation problems and heat generation associated with trapped air. The airless design extracts the problematic pneumatic element while retaining the essential tire function through alternative structural support mechanisms.
Solution Approach 2:
The tire employs a composite structure combining an elastomeric matrix with a shape memory alloy scaffold. This composite material system provides the necessary structural support and compliance without requiring internal air pressure, thereby avoiding heat generation from compressed air and eliminating deflation risks.
2Ease of manufacture
If synthetic rubber is used for tire production, then manufacturing is feasible, but it requires extensive oil refining and is environmentally unsustainable
Solution Approach 1:
The patent changes the material parameter from synthetic petroleum-based rubber to guayule-derived natural rubber. This parameter change maintains the elastomeric properties necessary for tire function while fundamentally altering the environmental profile from oil-intensive production to sustainable agricultural sourcing.
Solution Approach 2:
The tire incorporates biodegradable materials including guayule rubber, flax seed material, and other organic components that can decompose naturally. This approach accepts a finite service life in exchange for eliminating persistent environmental pollution, allowing the tire to return to the ecosystem after use.
3Strength
If natural rubber from hevea trees is used, then comparable durability is achieved, but it requires ten years to cultivate and grows only in narrow equatorial regions
Solution Approach 1:
The patent uses guayule rubber as a substitute copy of hevea rubber, replicating the desirable elastomeric properties and durability characteristics. While guayule grows as a shrub rather than a tree and has different cultivation requirements, it successfully copies the functional performance needed for tire applications.
Solution Approach 2:
The tire composition integrates multiple materials including guayule rubber, flax seed material, metal oxides, and carbon-based fillers to achieve the durability traditionally associated with hevea rubber. This multi-functional material system compensates for the shorter cultivation cycle and broader geographic adaptability of guayule compared to hevea trees.
4Reliability
If an airless tire structure is created, then resistance to deflation is improved, but the structure must support sufficient lateral and vertical compliance under vehicle load
Solution Approach 1:
The tire structure is segmented into distinct functional components: an elastomeric matrix providing compliance and a shape memory alloy scaffold providing structural support. This segmentation allows each component to specialize in its primary function, with the scaffold bearing loads and the matrix providing cushioning, simplifying the overall design compared to attempting to achieve both functions in a single pneumatic structure.
Solution Approach 2:
The shape memory alloy scaffold acts as an intermediary structural element between the ground load and the elastomeric matrix. It mediates the transmission of vertical and lateral forces while maintaining the compliance needed for tire function, eliminating the need for internal air pressure as the intermediary support mechanism.
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 biodegradable tire composition offers enhanced durability, reduced vibration, and improved heat management, with an estimated 2-3 times longer lifespan compared to traditional pneumatic tires, while being eco-friendly and resistant to punctures.
Implementation Method 1
the shape memory alloy scaffold comprises a Ni—Ti shape memory alloy, a Cu—Zn shape memory alloy, or a combination thereof
Implementation Method 2
an elastomeric matrix and a shape memory alloy scaffold integral with the elastomeric matrix
Implementation Method 3
guayule rubber (e.g., natural rubber produced from guayule shrubs) has comparable durability to hevea rubber as well as a large capacity for heat-dissipation
Implementation Method 4
The elastomeric matrix includes (by weight of the elastomeric matrix) a flax seed material from 14% to 19%, a guayule-derived natural rubber from 55% to 65%, a metal oxide from 12% to 15%, a carbon-based filler from 9% to 12%
Data Source
AI summary
A biodegradable tire includes an elastomeric matrix and a shape memory alloy scaffold integral with the matrix. The elastomeric matrix includes (by weight of the matrix) a flax seed material derived from 14% to 19%, a guayule-derived natural rubber from 55% to 65%, a metal oxide from 12% to 15%, a carbon-based filler from 9% to 12%, and one or both of an antioxidant and an antiozonant, each from 1.8% to 3.1%. Further, the tire is airless. In addition, the shape memory alloy scaffold comprises a Ni—Ti shape memory alloy, a Cu—Zn shape memory alloy, or a combination thereof.