The invention controls irregular wear in the shoulder land portions and reduces the occurrence of cracking in the shoulder grooves of a pneumatic tire. To that end, the groove wall surface (17a) on the shoulder land portion (19) side of the shoulder groove (17) has an inclined surface consisting of a first inclined part (171) inclined toward the equatorial plane of the tire at an inclination angle θ1, which is constant along the circumference of the tire, and a second inclined part (172) further inclined from the first inclined part (171) toward the equatorial plane of the tire and reaching the groove bottom (17b) of the shoulder groove (17) at an angle α with respect to the first inclined part (171), which varies along the circumference of the tire. Also, the inclination angles of the first and second inclined parts (171, 172) are set such that the maximum value αmax and the minimum value αmin of the angle α satisfy (D−d) (tan αmax−tan αmin)≧2.5 where D is the depth from the tread face to the bottom of the shoulder groove (17), d is the depth from the tread face to the boundary position between the first inclined part (171) and the second inclined part (172), αmax is the maximum value of the angle α, and αmin is the minimum value of the angle α.


    Access

    Download


    Export, share and cite



    Title :

    Pneumatic tire with tread having shoulder circumferential grooves


    Contributors:

    Publication date :

    2017-01-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



    Pneumatic tire with tread having circumferential grooves

    AMANO MASAKAZU | European Patent Office | 2017

    Free access

    Pneumatic tire with tread having shoulder lateral grooves

    NISHIWAKI TAKASHI | European Patent Office | 2016

    Free access


    Pneumatic tire with tread having five ribs and four circumferential grooves

    SUZUKI TAKAYUKI / IIZUKA HIROSHI / INOUE YOSHIHISA | European Patent Office | 2016

    Free access

    Pneumatic tire with tread having lateral grooves

    YUMII KEITA | European Patent Office | 2015

    Free access