Agricultural Tire High-Strength Polyamide Plies
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Solution Overview
Problem
Agricultural tires require unique structural features to handle distinct operating conditions, but existing designs often fall short in providing sufficient strength and durability due to suboptimal materials and configurations.
Innovation Solution
The use of high-strength polyamide yarns with deniers ranging from 1500 to 1900 and cord angles between 74 to 90 degrees in both body and belt plies, forming a robust carcass and belt layer within a toroidal tire structure, primarily composed of vulcanized rubber, enhances the tire's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials and configurations are used in agricultural tires, then manufacturing cost and ease of manufacture are maintained, but strength and durability are insufficient
Solution Approach 1:
The patent changes the material parameters by specifying polyamide yarns with deniers within the range of about 1500 to about 1900, which is a specific parameter range optimization. It also changes the geometric parameter by specifying cord angles within a range of about 74 degrees to about 90 degrees from the axial direction, resolving the contradiction between strength and manufacturability through defined parameter ranges.
Solution Approach 2:
The patent employs composite materials by combining high-strength polyamide yarns with vulcanized rubber in specific configurations for body plies and belt plies. This composite structure achieves superior strength and durability while maintaining manufacturability through the integration of specialized materials with defined properties.
2Strength
If high-strength materials and optimized configurations are used, then strength and durability are improved, but tire weight increases
Solution Approach 1:
The patent optimizes the weight issue by specifying precise parameter ranges for polyamide yarn deniers (1500-1900) and cord angles (74-90 degrees), which achieve high strength while controlling material quantity and distribution, thereby managing overall tire weight through parameter optimization rather than indiscriminate material addition.
3Reliability
If vulcanized rubber composition is increased to 90-95% of tire weight, then traction and load-bearing capabilities are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for polyamide yarn deniers (1500-1900) and cord angles (74-90 degrees) that facilitate consistent manufacturing of the 90-95% vulcanized rubber composition, transforming a potentially imprecise formulation into a controllable manufacturing process through specified parameters.
Data Source
Figure 1
Figure 2~3
AI summary
An agricultural tire includes a toroidal tire structure containing vulcanized rubber in an amount of about 90 percent or more by weight. The tire structure may have one or more performance enhancing features, including high strength plies. The high strength plies contain cords that are formed of yarns, including polyamide yarns, and have individual cord tensile strengths within a range of about 400 N to about 700 N. The performance enhancing features further include circumferential belt plies having cords at angles of about 74 degrees or more from an axial direction.