tire

The tire design with protruding land portions and strategically placed circumferential grooves addresses the challenge of balancing steering stability on dry and snowy roads by enhancing ground contact pressure and rigidity, resulting in improved stability on both surfaces.

JP2025006316APending Publication Date: 2025-01-17THE YOKOHAMA RUBBER CO LTD
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Patent Information

Application Number
JP2023107028
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-06-29
Publication Date
2025-01-17

AI Technical Summary

Technical Problem

Existing tires face challenges in achieving balanced steering stability on both dry and snowy road surfaces, as improving steering stability on one surface often compromises the other due to unequal ground contact pressure distribution and groove placement.

Method used

The tire design features at least three circumferential main grooves and four rows of land portions with protruding tread surfaces, incorporating circumferential narrow grooves that terminate within the land portions, positioned to maximize ground contact pressure and maintain land portion rigidity, with specific dimensions and orientations to enhance steering stability on both dry and snowy roads.

Benefits of technology

The design improves steering stability on both dry and snowy roads by optimizing ground contact shape, increasing edge components, and maintaining land portion rigidity, thereby achieving well-balanced performance across different road conditions.

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    Figure 2025006316000001_ABST
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Abstract

To provide a tire which enables steering stability on a drive road surface and steering stability on a snow road surface to be improved with good balance.SOLUTION: A tread part 1 includes a profile line TL of a tire width direction defined on the basis of the edge positions of lands 21-25 and the ground end position of the tread part 1 on a meridian cross section. On the meridian cross section, each of the treads of the lands 21-25 protrudes outside the profile laine TL in a tire radial direction. The protruding amounts of the treads of the lands 21-25 from the profile line TL are 0.05-1.00 mm. A circumferential thin groove 15 terminating within the land is disposed in at least one row of the lands 21-25. A tire-width distance A from a position of the largest protruding amount of the land where the circumferential groove 15 is disposed to the groove width center of the circumferential groove 15 and the width W1 of the land where the circumferential groove 15 is disposed satisfy a relationship of 0≤A≤W1 / 4.SELECTED DRAWING: Figure 1
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Citation Information

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