Pneumatic Tire Sipe Chamfering for Wear and Braking
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Solution Overview
Problem
Conventional pneumatic tires lack improved wear resistance, dry braking performance, and wet braking performance.
Innovation Solution
The pneumatic tire design includes a circumferential main groove, lug grooves, sipes, and chamfered portions, where the chamfered portion's length is less than 70% of the sipe's length, with specific depth relationships between the grooves and chamfered portions to enhance block rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes and lug grooves are provided in the tread portion to improve water drainage properties, then wet braking performance is improved, but wear resistance performance deteriorates
Solution Approach 1:
The patent applies local quality by providing chamfered portions at specific locations on the sipe walls rather than uniformly across the entire sipe structure. The chamfered portions are located at the inner peripheral side of the sipe in the width direction, creating localized structural modifications that maintain block rigidity while preserving water drainage functionality. This localized approach allows the tire to achieve improved wet braking performance without compromising overall wear resistance.
2Reliability
If deep grooves are provided to improve water drainage properties, then wet braking performance is improved, but block rigidity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the sipe structure into multiple functional zones: the main sipe body for water drainage and the chamfered portions for structural support. The chamfered portions are segmented and positioned at specific locations (inner peripheral side of the sipe) to provide localized reinforcement. This segmentation allows the sipe to maintain adequate block rigidity while still providing effective water drainage pathways.
Data Source
AI summary
A pneumatic tire includes a circumferential main groove extending in a tire circumferential direction, a block, which is a land portion defined by the circumferential main groove, a sipe extending through the block in a tire width direction, and chamfered portions provided in the sipe. A total length of lengths of the chamfered portions in the tire width direction is less than 70% of a length of the sipe in the tire width direction.