Pneumatic Tire Shoulder Land Chamfered Grooves
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Solution Overview
Problem
Conventional pneumatic tires face challenges in maintaining steering stability on both wet and dry road surfaces, with existing designs often compromising on either wet or dry performance due to uneven rigidity and drainage issues.
Innovation Solution
The pneumatic tire design incorporates a circumferential main groove with a land portion featuring a through lug groove and chamfered portions on its left and right edges, ensuring uniform rigidity and enhanced drainage, thereby improving both wet and dry steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chamfered portions are provided in sipe opening portions to suppress tread curling, then braking ability is improved, but steering stability on wet road surfaces deteriorates
Solution Approach 1:
The patent applies local quality by providing chamfered portions specifically in the shoulder land portions at the left and right edges of the tread, rather than uniformly across all sipes. This localized approach suppresses tread curling at the shoulders where it occurs most during braking, while maintaining steering stability in the central region where chamfered portions are absent.
Solution Approach 2:
The patent segments the tread into distinct regions: shoulder land portions with chamfered portions for braking performance, and central land portions without chamfered portions for steering stability. This segmentation allows each region to optimize its function independently, resolving the contradiction between braking ability and wet steering stability.
2Strength
If chamfered portions are concentrated in one region to improve braking, then braking ability is enhanced, but rigidity distribution becomes uneven, worsening steering stability
Solution Approach 1:
The patent employs asymmetric distribution of chamfered portions by placing them only in the shoulder land portions at the left and right edges, while leaving the central land portions without chamfered portions. This asymmetric design creates intentional rigidity differences: flexible shoulders for braking and a rigid central region for steering stability, thus resolving the contradiction between braking enhancement and rigidity distribution.
3Reliability
If groove volume is increased to improve wet performance, then drainage capability is enhanced, but block rigidity decreases, worsening dry steering stability
Solution Approach 1:
The patent applies local quality by providing larger groove volumes specifically in the shoulder land portions where drainage is most critical for wet performance, while maintaining smaller groove volumes in the central land portions where block rigidity is essential for dry steering stability. This localized differentiation resolves the contradiction between wet drainage capability and dry steering stability.
Solution Approach 2:
The patent segments the groove system into shoulder regions with high drainage capacity (larger groove volume) and central regions with high structural integrity (smaller groove volume). This segmentation allows the tire to optimize wet performance through enhanced drainage at the shoulders while preserving dry steering stability through maintained rigidity in the central blocks.
Data Source
AI summary
A pneumatic tire includes circumferential main grooves extending in the tire circumferential direction and a land portion defined by the circumferential main grooves. The land portion includes a through lug groove that passes through the land portion in the tire lateral direction and includes first and second chamfered portions formed on left and right edge portions of the through lug groove. The first chamfered portion opens at one end to one of the edge portions of the land portion and terminates at the other end at a central portion in the groove length direction of the through lug groove. The second chamfered portion opens at one end portion to one of the edge portions of the land portion and terminates at the other end portion at a central portion in the groove length direction of the through lug groove.