pneumatic tires

JP7775841B2Active Publication Date: 2025-11-26SUMITOMO RUBBER INDUSTRIES LTD
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Patent Information

Application Number
JP2022572923
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-12-28
Filing Date
2021-10-26
Publication Date
2025-11-26
Estimated Expiration
2041-10-26

AI Technical Summary

Technical Problem

Conventional pneumatic tires fail to adequately reduce rolling resistance at high speeds and maintain handling stability during high-speed driving.

Method used

A tire design with a belt layer featuring densely arranged monofilament cords at 50 cords/5 cm, coated with a specific rubber composition, adhering to the formula (Dt 2 ×π/4)/Wt ≧ 1500 and [(tanδ/E * )/e]×1000 ≦ 0.12, along with a multi-layered belt structure and optimized tread grooves, enhances low rolling resistance and handling stability.

Benefits of technology

The tire design significantly improves low rolling resistance and suppresses deterioration in handling stability during high-speed driving by effectively restraining tread deformation and maintaining rigidity.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

Provided is a pneumatic tire in which low rolling resistance during high speed travel is further improved and loss of steering stability during high speed travel is further minimized. Provided is a pneumatic tire having a tread section and a belt layer, wherein reinforcing cords in the belt layer are formed by arranging cords composed of monofilaments in an amount of at least 50 cords / 5 cm in the tire width direction in a cross section of the belt layer in the radial direction of the tire, and the tire satisfies (formula 1), where Wt (mm) is the cross-sectional width and Dt (mm) is the outer diameter of the tire when attached to a standard rim and set to an internal pressure of 250 kPa.　(Formula 1): 1500 ≤ (Dt2 × π / 4) / Wt
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Citation Information

Patent Citations

  • Pneumatic radial tire

    JP2001334809A

  • Rubber composition for coating steel cord and tire having belt or breaker obtained by covering steel cord with the same

    JP2008156418A

  • Pneumatic tire and its manufacturing method

    JP2010089727A

  • Rubber composition for tire cord covering, breaker edge strip, breaker cushion or cord-adjacent strip, and pneumatic tire

    JP2013122038A

  • Tires with a lightweight belt structure

    JP2015511197A