Resin Tire Frame with Controlled Elastic Modulus and Creep
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Solution Overview
Problem
Tires made from olefin-based resin compositions, such as polypropylene-based resins, face challenges in achieving both favorable fittability onto a rim and resistance to deformation during traveling, which are not easily addressed by conventional rubber tires.
Innovation Solution
A tire with a circular frame formed from a resin material containing an olefin-based resin composition, specifically a polypropylene-based resin, with a tensile elastic modulus between 140 MPa and 570 MPa and an amount of creep of 50 mm or less, ensuring excellent fittability and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an olefin-based resin composition is used in the tire frame, then manufacturing cost is reduced and ease of manufacture is improved, but resistance to deformation during traveling deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile elastic modulus of the resin material within 100-600 MPa and the amount of creep to 50 mm or less. This resolves the contradiction by optimizing the material parameters to achieve both ease of manufacture (through injection molding) and resistance to deformation (through controlled mechanical properties).
Solution Approach 2:
The patent uses composite materials by combining olefin-based resin composition with specific physical property parameters. The resin material is designed as a composite system that integrates the cost advantages of olefin-based resins with enhanced mechanical performance through controlled tensile elastic modulus and creep resistance, achieving both manufacturability and structural integrity.
2Ease of manufacture
If an olefin-based resin composition is used in the tire frame, then manufacturing cost is reduced, but fittability onto a rim deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the tensile elastic modulus within 100-600 MPa and amount of creep to 50 mm or less. These parameter optimizations enable the olefin-based resin to achieve both cost effectiveness and reliable fittability onto the rim by ensuring proper mechanical interlocking and sealing performance.
3Reliability
If conventional rubber materials are used, then heat resistance and durability are maintained, but manufacturing complexity and production time increase
Solution Approach 1:
The patent applies mechanics substitution by replacing the vulcanization process (thermal-chemical crosslinking) with injection molding of thermoplastic olefin-based resin. This substitution eliminates complex multi-step manufacturing processes while maintaining heat resistance through the inherent thermal stability of the optimized resin material, thereby significantly improving productivity.
4Strength
If the tensile elastic modulus is increased to improve resistance to deformation, then resistance to deformation during traveling is improved, but fittability onto a rim deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing an optimal range for tensile elastic modulus (100-600 MPa) rather than maximizing it. This parameter optimization resolves the contradiction by finding the balance point where the material is stiff enough to resist deformation during traveling but flexible enough to achieve proper fittability onto the rim during assembly.
Data Source
AI summary
A tire having a circular tire frame formed of a resin material, the resin material including an olefin-based resin composition and having a tensile elastic modulus as defined in JIS K7113 (1995) of from 140 MPa to 570 MPa and an amount of creep as defined in JIS K7115 (1999) of 50 mm or less, and a degree of crystallinity of the polypropylene-based resin being from 24.5% to 32.7%.