Directional Tire Tread Layout for Dry Grip and Braking
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Solution Overview
Problem
Current four-season tires face a challenge in achieving an optimal grip compromise between snowy, wet, and dry surfaces, particularly in improving grip performance on dry ground and during braking.
Innovation Solution
The tire features a directional tread with a specific surface notch rate and incision density, along with a unique rubber composition and tread pattern design, which includes blocks with a maximum height of 5.5 to 9 mm and a glass transition temperature between -40°C and -15°C, enhancing grip on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blocks are made taller to improve grip on various surfaces, then grip performance is improved, but rolling resistance increases
Solution Approach 1:
Blocks in the central zone are made taller (5-15mm) to improve grip performance, while the overall tread design maintains a balance that limits excessive height. This local quality approach allows grip improvement without proportionally increasing rolling resistance across the entire tread.
Solution Approach 2:
The invention optimizes the block height parameter within a specific range (5-15mm) and controls the surface notch ratio (40-70%) to achieve the best compromise between grip performance and rolling resistance. These parameter changes allow improved grip while managing energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design provides an excellent grip compromise between snowy and wet conditions while improving grip and braking performance on dry ground, maintaining effectiveness even as the tire wears.
Implementation Method 1
The blocks are made of rubber material... with a glass transition temperature between -40°C and -15°C
Implementation Method 2
a tire with an excellent compromise in grip between snowy and wet ground while improving grip performance on dry ground
Data Source
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AI summary
The invention relates to a tyre having a directional tread, which forms a contact patch AC when running. It comprises a plurality of blocks (21A, 21B) which form a contact surface SC. The surface voids ratio is defined by TES=(AC-SC)/AC. The blocks (21A, 21B) are organized into patterns (26) of blocks of spacing P, which follow one another in the circumferential direction (X), in a pattern comprising at least one sipe. The sipe density is defined by formula (I), where n is the sipe number, lpyi is the projected distance of the sipe i in the axial direction (Y), and W is the width of the tread. Simultaneously, SD is at least equal to 10 mm-1 and at most equal to 70 mm-1, and TES is at least equal to 0.40 and at most equal to 0.70.