Pneumatic Tire Annular Structure for Rolling Resistance
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Solution Overview
Problem
Pneumatic tires face challenges in reducing rolling resistance while maintaining steering stability and cornering power, as existing materials and structures do not effectively balance these factors.
Innovation Solution
A pneumatic tire design featuring a cylindrical annular structure made from a metal material with a rubber layer and a carcass portion including fibers, where an extending portion is integrated to enhance rigidity and balance stiffness, ensuring a larger ground contact area and eccentric deformation for reduced rolling resistance and improved cornering power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a silica-compounded rubber is used for the tread to reduce rolling resistance, then fuel consumption is improved, but steering stability and cornering power may be compromised
Solution Approach 1:
The annular structure is positioned specifically in the circumferential center region of the tread, creating local structural reinforcement where it is most needed for steering stability while allowing the silica rubber to function optimally in other areas for low rolling resistance
Solution Approach 2:
The invention combines silica-compounded rubber material with a metal annular structure, creating a composite tire system that leverages the low rolling resistance properties of silica rubber while adding the structural stability provided by the metal annular framework
2Loss of energy
If the tread structure is modified to reduce rolling resistance, then fuel efficiency is improved, but cornering power may be reduced
Solution Approach 1:
The annular structure is strategically positioned in the circumferential center region to provide localized structural support that enhances cornering force generation without requiring modifications to the entire tread structure, thereby maintaining low rolling resistance properties
Solution Approach 2:
The tire structure is segmented into distinct functional regions: the silica rubber tread for low rolling resistance, the annular structure for structural support and cornering power, and the carcass portions for overall tire integrity, allowing each segment to optimize its specific function
3Reliability
If an annular structure is added to enhance steering stability, then structural rigidity is improved, but device complexity increases
Solution Approach 1:
The annular structure is designed as a thin-walled cylindrical shell that provides substantial structural rigidity and steering stability support while maintaining flexibility for tire deformation during operation, achieving high performance with minimal material and structural complexity
Solution Approach 2:
The annular structure serves multiple functions simultaneously: it provides steering stability, maintains tire shape, supports the tread layer, and works with the carcass portions to distribute stresses, reducing the need for additional separate structural components
Data Source
AI summary
A pneumatic tire including: a cylindrical annular structure; a rubber layer, which will become a tread portion, provided along a circumferential direction of the annular structure on an outer side of the annular structure; a carcass portion provided on at least both sides in a width direction of the cylindrical structure including the annular structure and the rubber layer; and an extending portion that extends from both sides in the width direction of the annular structure farther outward in the width direction than a ground contact edge on the outer side in the width direction of the tread portion, and that is provided in plurality on both sides in the width direction along the circumferential direction of the annular structure.