Tire Tread with Deep Sipes and Composite Rubber
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Solution Overview
Problem
Tires face challenges in achieving improved grip performance during high-speed driving and handling stability during normal driving, as existing technologies do not adequately address the need for enhanced traction and stability across varying road conditions.
Innovation Solution
The development of tires with a tread featuring a sipe depth of more than 50% of the tread thickness, utilizing a rubber composition containing styrene-butadiene rubber with 50% or higher mass content, hydrogenated dicyclopentadiene resins, and oils, which satisfies specific mass ratios and interactions to enhance deformation and conformability to road irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread uses a rubber composition with high styrene-butadiene rubber content and deep sipes, then grip performance during high speed driving is improved, but handling stability during normal driving may deteriorate
Solution Approach 1:
The tread uses a composite rubber composition containing styrene-butadiene rubber (50% or higher), hydrogenated dicyclopentadiene resin, and oil. This composite structure combines the high grip properties of SBR with the stability-providing characteristics of hydrogenated dicyclopentadiene resin, resolving the contradiction between grip performance and handling stability
Solution Approach 2:
The tread features localized deep sipes (with sipe depth > 50% of tread thickness) in specific regions rather than uniform structure throughout. This allows deep sipes to provide enhanced grip where needed while maintaining overall structural integrity for handling stability
2Reliability
If the sipe depth is increased to improve grip performance, then traction on road irregularities is enhanced, but the structural integrity and handling stability may be compromised
Solution Approach 1:
The invention changes the sipe depth parameter to be greater than 50% of the tread thickness, which is a specific quantitative threshold. This parameter change optimizes the balance between grip performance (enhanced by deep sipes) and handling stability (maintained by not exceeding the 50% threshold)
Solution Approach 2:
The use of hydrogenated dicyclopentadiene resin in the rubber composition provides structural reinforcement that compensates for the structural compromise introduced by deep sipes, allowing the tread to maintain both deep sipes for grip and overall strength for handling stability
Data Source
Figure 1
AI summary
The present invention provides tires which provide improved overall performance in terms of grip performance during high speed driving and handling stability during normal driving. Included are tires including a tread, the tread having a sipe depth of more than 50% of the thickness of the tread, the tread including a rubber composition containing one or more rubber components having a styrenebutadiene rubber content of 50% by mass or higher, one or more hydrogenated dicyclopentadiene resins, and one or more oils.