Heavy-Duty Pneumatic Tire Shoulder Land Optimization
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Solution Overview
Problem
Heavy-duty pneumatic tires face issues with tread rubber damage, excessive deformation, and uneven wear, leading to potential cracks and reduced traveling stability when swiveling or running on curbs, which affects ground contact area and wheel track wandering performance.
Innovation Solution
The pneumatic tire design includes a tread portion with specific dimensions and features such as shoulder land portions, recessed portions, and sipes, along with a belt layer configuration that satisfies certain conditions to prevent excessive deformation and improve wheel track wandering performance, ensuring adequate ground contact and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove depth of the shoulder rib groove is defined to improve tire performance, then the tire can better handle swiveling and curb conditions, but the tread rubber may still incur excessive deformation and damage
Solution Approach 1:
The patent applies local quality by creating a shoulder land portion with specific dimensional characteristics (width and groove depth ratios) that differ from other tread regions. This localized structural optimization at the shoulder area provides enhanced deformation resistance precisely where swiveling and curb contact occur, without compromising overall tire performance
Solution Approach 2:
The patent utilizes parameter changes by establishing specific quantitative relationships for the shoulder land portion dimensions, particularly the width-to-groove-depth ratio parameters. By optimizing these geometric parameters within defined ranges, the invention achieves improved balance between deformation resistance and tire performance
2Reliability
If the shoulder portion of the tread portion is made square-shaped to improve uneven wear performance, then wear distribution is improved, but traveling stability decreases and wheel track wandering increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the shoulder land portion width and groove depth within specific ratio ranges. This quantitative optimization allows the tread to maintain a configuration that promotes even wear while preserving sufficient shoulder contact area for stable wheel track following
Solution Approach 2:
The patent applies partial action by implementing the optimized shoulder land portion configuration only in the critical shoulder region rather than across the entire tread. This localized optimization achieves wear improvement without excessively modifying the overall tread pattern, thereby maintaining traveling stability
3Duration of action of stationary object
If the land portion is designed to prevent damage and excessive deformation, then tread rubber durability is improved, but the ground contact area may decrease during cornering
Solution Approach 1:
The patent applies local quality by concentrating the enhanced structural features (optimized groove depth and land portion width) specifically at the shoulder land portion where deformation damage most commonly occurs. This localized reinforcement prevents damage without requiring overall tread restructuring that would reduce ground contact area
Data Source
AI summary
On a pneumatic tire are defined a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread portion, a second imaginary line VL2 passing through a bottom portion of a shoulder main groove and parallel to VL1, an intersection point P between VL2 and a surface of a shoulder land portion outward from a ground contact edge in a lateral direction, and an equatorial plane CL. 0.80≤(B+C)/A≤1.15 is satisfied, where A represents a distance in the lateral direction between P and CL, B represents a depth of the shoulder main groove, and C represents a distance in the lateral direction between the ground contact edge and CL. 0.75≤S/A≤0.95 is satisfied, where S represents a distance in the lateral direction between CL and an end portion of a longest belt ply in the lateral direction.