Pneumatic tire with tread having shoulder circumferential grooves
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United States of America Patent
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Jan 17, 2017
Grant Date -
Jan 2, 2014
app pub date -
Feb 24, 2012
filing date -
Feb 25, 2011
priority date (Note) -
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Abstract
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.
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