Pneumatic tire with tread having protruding stripe in groove bottom and tire mold for making the tire
AssigneeToyo Tire & Rubber Co., Ltd.
InventorMasaaki Ohara
Life of this patent
Estimating the term…
Abstract
A groove bottom of a circumferential groove formed in a tread surface is provided with a protruding stripe extending along an extending direction of the circumferential groove. The protruding stripe is provided with a top head portion protruding toward a tire outer circumferential side, and a base portion which is narrower than the top head portion and connects the top head portion and the groove bottom. If a small stone is pinched, the top head portion is inclined around the base portion, and the protruding stripe is deflected as a whole, thereby generating a reaction force on the basis of a deformation restoring force.
Claims8
A pneumatic tire in which a tread surface is provided with a groove portion, and a land portion divided by the groove portion,
- wherein a protruding stripe extending along an extending direction of the groove portion is provided in a groove bottom of the groove portion,
- wherein the protruding stripe is provided with a top head portion protruding toward a tire outer circumferential side, and a base portion being narrower than the top head portion and connecting the top head portion and the groove bottom, and
- wherein a ratio H/D of a height H of the protruding stripe with respect to a groove depth D of the groove portion satisfies the relation 0.2<H/D<0.5;
- the height of the protruding stripe is constant;
- the base portion is pinched-in while having a side surface formed in a circular arc cross sectional shape, and the side surface is smoothly connected to a side surface of the top head portion and the groove bottom;
- a ridge line portion in the tire outer circumferential side of the top head portion is formed by a curved surface having a circular arc cross sectional shape;
- the top head portion is formed in a vertically longer rectangular cross sectional shape and a top surface of the top head portion is formed by a plane surface.
Dependencies are inferred from the claim text.