To provide a heavy duty tire 2 that can achieve improvement of bead durability without causing an increase in rolling resistance.SOLUTION: A contours CL of a carcass 12 includes a curved portion 44 and an inversely curved portion 46 in a meridian cross section of a tire 2. A boundary between the curved portion 44 and the inversely curved portion 46 is an inflection point PV. A part or all of the curved portion 44 is expressed as a first circular arc which includes the inflection point PV. A part or all of the inversely curved portion 46 is expressed as a second circular arc which includes the inflection point PV. The first circular arc and the second circular arc come in contact with each other at the inflection point PV. A ratio (X/W) of axial distance X from an equatorial plane to the inflection point PV to axial distance W from the equatorial plane to the axial direction external end PW is 70% or more and 85% or less. The ratio (Y/H) of radial distance Y from bead base line to the inflection point PV to radial distance H to an intersecting point PE between the contour CL and the equatorial plane, is 15% or more and 22% or less.SELECTED DRAWING: Figure 2

    【課題】転がり抵抗の増加を招くことなく、ビード耐久性の向上を達成できる、重荷重用タイヤ2の提供。【解決手段】このタイヤ2の子午線断面において、カーカス12の輪郭CLは、湾曲部44と逆湾曲部46とを備える。湾曲部44と逆湾曲部46との境界は変曲点PVである。湾曲部44の一部又は全部は、変曲点PVを含む第一の円弧で表される。逆湾曲部46の一部又は全部は、変曲点PVを含む第二の円弧で表される。第一の円弧と第二の円弧とは変曲点PVにおいて接する。赤道面から変曲点PVまでの軸方向距離Xの、軸方向外端PWまでの軸方向距離Wに対する比率(X/W)は70%以上85%以下である。ビードベースラインから変曲点PVまでの径方向距離Yの、輪郭CLと赤道面との交点PEまでの径方向距離Hに対する比率(Y/H)は15%以上22%以下である。【選択図】図2


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    Title :

    HEAVY DUTY TIRE AND PRODUCTION METHOD FOR HEAVY DUTY TIRE


    Additional title:

    重荷重用タイヤ及び重荷重用タイヤの製造方法


    Contributors:

    Publication date :

    2023-10-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS / B60C VEHICLE TYRES , Fahrzeugreifen / B29D PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE , Herstellen besonderer Gegenstände aus Kunststoff oder aus Stoffen in plastischem Zustand



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