To suppress a tread from being unevenly worn to prevent the tread from being broken and a side blade from being damaged during mold opening.SOLUTION: In a pneumatic tire, a tread is provided with narrow grooves 50 formed with an interval in a tire circumferential direction CD, and division traces 19 provided at division positions of a sector. The narrow grooves comprise sipes extending in a tire axial direction D and chamfers expanding widths of ends of openings to a grounding surface 8a of the sipes. When ranges within a first angle θ1 from the division traces towards a center in the tire circumferential direction, of regions sandwiched by the division traces arranged adjacently in the tire circumferential direction, are, set as first circumferential end regions R1 and a region sandwiched between the first circumferential end regions is set as a central region Rm, connection positions PA between the chamfers 54A of first narrow grooves 50A in which the chamfers are formed at groove walls 53Aa near the central regions of the sipes, of the narrow grooves formed in the first circumferential end regions and the sipes 53A are positioned closer to outside in a tire radial direction than connection positions PB1 and PB2 between the chamfers 54B1 and B2 of second narrow grooves 50B1 and B2 and the sipes 53B1 and B2.SELECTED DRAWING: Figure 9

    【課題】トレッドの偏摩耗を抑制し、型開き時のトレッド欠損やサイプブレード破損等の不具合を防ぐ。【解決手段】タイヤ周方向CDに間隔をあけて設けられた細溝50と、セクタの分割位置に設けられた分割跡19とをトレッドに備え、細溝が、タイヤ軸方向Dに延びるサイプと、サイプの接地面8aへの開口端の幅を広げる面取りとを備える。タイヤ周方向に隣り合う分割跡で挟まれた領域のうち、分割跡からタイヤ周方向中央へ向かって第1の角度θ1までの範囲を第1周方向端領域R1、第1周方向端領域の間に挟まれた領域を中央領域Rmとすると、第1周方向端領域に設けられた細溝のうち、面取りがサイプの中央領域側の溝壁53Aaに設けられた第1細溝50Aの面取り54Aとサイプ53Aとの接続位置PAが、第2細溝50B1,B2の面取り54B1,B2とサイプ53B1,B2との接続位置PB1,PB2よりタイヤ径方向外側に位置する。【選択図】図9


    Access

    Download


    Export, share and cite



    Title :

    PNEUMATIC TIRE AND VULCANIZATION FORMING MOLD


    Additional title:

    空気入りタイヤ及び加硫成型金型


    Contributors:

    Publication date :

    2024-09-02


    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



    PNEUMATIC TIRE AND VULCANIZATION FORMING MOLD

    AMIMOTO KOKI | European Patent Office | 2024

    Free access

    Tire vulcanization mold and pneumatic tire

    UENO TOMONORI | European Patent Office | 2021

    Free access

    TIRE VULCANIZATION MOLD AND PNEUMATIC TIRE

    ANDO TAKAHIRO | European Patent Office | 2018

    Free access

    TIRE VULCANIZATION MOLD AND PNEUMATIC TIRE

    UENO TOMONORI | European Patent Office | 2018

    Free access

    PNEUMATIC TIRE AND TIRE VULCANIZATION MOLD

    SAKURA MASAAKI | European Patent Office | 2024

    Free access