Pneumatic Tire Zigzag Sipe Width Variation
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Solution Overview
Problem
The formation of sipes in the tread of a pneumatic tire decreases the rigidity of the land portion, compromising grounding performance.
Innovation Solution
A pneumatic tire design featuring a block structure with a zigzag-shaped block traversing sipe, comprising longitudinal and lateral sipe portions, where the longitudinal sipe portion closer to the kick-out side has a narrower width, maintains rigidity while enhancing grounding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sipe is formed in the land portion of the tread, then grounding performance is improved, but rigidity of the land portion decreases
Solution Approach 1:
The sipe width is varied locally within the block traversing sipe structure. The first longitudinal sipe portion has a different width than the second longitudinal sipe portion, creating local quality variations that optimize both grounding performance and rigidity in different regions of the sipe
Solution Approach 2:
The block traversing sipe is segmented into multiple components: first longitudinal sipe portion, second longitudinal sipe portion, and lateral sipe portion connecting them. This segmentation allows each segment to serve different functions - some portions prioritize grounding contact while others maintain structural rigidity
Data Source
AI summary
A pneumatic tire includes a block (41) formed by being partitioned by a main groove (15) and lateral grooves (20 and 25), and a block traversing sipe (45) which is a sipe longitudinally traversing the block (41), in which the block traversing sipe (45) has a zigzag shape that is constituted by a plurality of longitudinal sipe portions (42) extending in a circumferential direction of the tire, and a lateral sipe portion (43) extending in a tire width direction and connecting end portions of two longitudinal sipe portions (42), and a longitudinal sipe portion (42) closer to a kick-out side of the block (41) has a narrower width.