Sumitomo Rubber Industries Limited

Kazuma Mori

Koichi Nakajima

Mitsuru Sueyoshi

Aiko Yamamoto

Provided is a tire that allows reduction of uneven wear such as heel-and-toe wear around a plurality of closed sipes. The tire includes a tread portion. A plurality of closed sipesare aligned in a tire axial direction in a land portionof the tread portion. Each of the closed sipesincludes a sipe bottom, a first endand a second end, a first sipe piece, a second sipe piece, a third sipe piece, and at least one tie bar. The closed sipesaligned in the tire axial direction overlap each other in the tire axial direction and a tire circumferential direction. The tie barincludes a first tie bar. A center, in a sipe length direction, of the first tie baris disposed closer to a first intersecting portionthan a center, in a length direction, of the first sipe pieceis. A distance from the first tie barto the first intersecting portionis not greater than 25% of a length of the first sipe piece

Tire

A tread portion of a tire includes at least one land portion. The land portion includes an outer region disposed inwardly of a tread surface in a tire radial direction, an inner region disposed on an inner side in the tire radial direction, and at least one sipe. The sipe includes one outer sipe element extending in the outer region in a tire axial direction, and a plurality of inner sipe elements extending in the inner region. The inner sipe elements include a component extending in a tire circumferential direction, and is connected to the outer sipe element.

A tire comprises a tread portion. The tread portion is provided with a sipe. The sipe comprises four sipe segments: a first sipe segment, a second sipe segment, a third sipe segment, and a fourth sipe segment. At least one of the first sipe segment and the third sipe segment comprises an oscillated portion which extends in the radial direction of the tire, while oscillating in a lateral direction orthogonal to the length direction of the sipe in a cross section of the sipe orthogonal to the length direction. Each of the first sipe segment and the third sipe segment comprises the oscillated portion including an oscillating-start portion, and the oscillating-start portion of the first sipe segment is inclined with respect to the tire radial direction in the same direction as the oscillating-start portion of the third sipe segment.

A tire includes a side protector at each side surface thereof. The tire satisfies mathematical formulas (1) and (2):2&#x3e;1&#x2003;&#x2003;(1)2&#x3e;3&#x2003;&#x2003;(2)wherein Rrepresents a ratio of lands in a zone, of the side surface, between a position of a radially inner end of the side protector and a position at 70% of a height of the tire, Rrepresents a ratio of lands in a zone, of the side surface, between the position at 70% of the height of the tire and a position at 85% of the height of the tire, and Rrepresents a ratio of lands in a zone, of the side surface, between the position at 85% of the height of the tire and a position at 97% of the height of the tire.

Pneumatic tire

The tire has a tread portioncomprising a plurality of main grooves and a first land portiondivided by the main grooves. The first land portioncomprises a plurality of first blocksdivided by first lateral grooves. The first lateral grooveis provided with a first tie barraising from a part of the groove bottom excluding its end portions in the tire axial direction. The first blockis provided with a first sipeinclined with respect to the tire axial direction to the same orientation over its entire length from a first longitudinal edgeto a second longitudinal edgesof the block. The first sipeis composed of a first portionextending from the first longitudinal edge, a second portionextending from the second longitudinal edge, and a third portionbetween the first portionand the second portion. The angle with respect to the tire axial direction of the third portionis greater than the angles with respect to the tire axial direction of the first portionand the second portion

A pneumatic tire includes sidewall portions, at least one of which is provided in the outer surface thereof with an axially outwardly protruding protector. The protector is composed of patterned unit protrusions arranged at intervals in the tire circumferential direction. Each patterned unit protrusion includes a first protruding portion and a second protruding portion which extend in a tire radial direction and spaced apart from each other in the tire circumferential direction, and a third protruding portion connecting between the first and second protruding portions. The radial dimension L1 of the first protruding portion is more than the radial dimension L2 of the second protruding portion.

A normal rimincludes a flange. The flangeforms an outer circumferential bent surfacethat is bent with a radius Rr of curvature. A first reference line Lrepresents a straight line that extends through a center point Pr of the radius Rr, and that is tilted by an angle of 45&#xb0;. In a state where the tire is inflated to a normal internal pressure and is under 120% of a normal load, Te represents a thickness from an inner cavity surface to an outer surface of the clinch, Tfrepresents a thickness of a filler, Tcrepresents a thickness of the clinch, Tarepresents a thickness obtained by the thickness Tfand the thickness Tcbeing added, and the thicknesses are measured along the first reference line L, and a ratio (Ta/Te) of the thickness Tato the thickness Te is greater than 0.4.

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Kobe, Japan

Kazuma Mori