Tread Sipe Layout for Tire Edge Effect Without Uneven Wear
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Solution Overview
Problem
Pneumatic tires with V-shaped sipes suffer from reduced rigidity, leading to deterioration in uneven wear properties due to the continuous narrow grooves, which compromises their performance on slippery road surfaces.
Innovation Solution
A pneumatic tire design featuring main grooves and lateral grooves inclined in opposite directions, with sipes extending at angles to connect through recessed portions shallower than the sipes, enhancing wear resistance while maintaining edge effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V-shaped sipes are formed by continuous narrow grooves, then edge effect is improved, but rigidity of the land part deteriorates leading to uneven wear
Solution Approach 1:
The continuous narrow groove of the V-shaped sipe is divided into multiple segments by introducing first and second connecting portions. These connecting portions are formed by recessed portions that are shallower than the sipe depth, effectively segmenting the continuous groove into discrete sections. This segmentation maintains the edge effect by preserving the V-shaped sipe structure while preventing excessive rigidity reduction that would lead to uneven wear.
Solution Approach 2:
The connecting portions are designed with different depth characteristics compared to the main sipe grooves. Specifically, the first and second connecting portions are formed by recessed portions that are shallower than the sipes, creating local variations in groove depth. This local quality differentiation allows the sipe regions to maintain edge effect while the connecting portions provide structural support to preserve land part rigidity.
2Reliability
If V-shaped sipes are formed by continuous narrow grooves, then edge effect is improved, but uneven wear property deteriorates
Solution Approach 1:
The continuous narrow groove is segmented into multiple sections by first and second connecting portions formed with recessed portions shallower than the sipe depth. This segmentation prevents the continuous groove from causing excessive flexibility in the land part, thereby improving uneven wear properties while maintaining the edge effect functionality of the V-shaped sipes.
Solution Approach 2:
The connecting portions are pre-formed during the tire manufacturing process to provide structural reinforcement before the tire enters service. By预先 forming these shallower recessed portions, the land part rigidity is maintained from the outset, preventing uneven wear from developing during tire operation while the V-shaped sipes continue to provide edge effect.
Data Source
AI summary
A pneumatic tire including a first block line in which a plurality of first blocks sectioned by main grooves and lateral grooves are arranged in a tire circumferential direction on a tread, the plurality of lateral grooves includes first lateral grooves extending inclined with respect to a tire width direction and second lateral grooves inclined in an opposite direction to the first lateral grooves with respect to the tire width direction, the first and second lateral grooves are alternately arranged, the first block includes a first sipe extending while being inclined to the tire width direction, a second sipe inclined in an opposite direction to the first sipe with respect to the tire width direction, and a first connecting portion connecting ends of the first sipe and the second sipe, and the first connecting portion is formed by a recessed portion shallower than the first sipe and the second sipe.