Sumitomo Rubber Industries Limited

Ryota Ikeda

Masahiro Tatsuta

Yuto Ohte

Kohei Hayama

Akiko Miura

Yuta Sakakibara

Takashi Hagihara

Kengo Fukuda

Kohei Miyoshi

Takuya Osawa

Keiji Higuchi

Tomohisa Kuriyama

Daichi Takatsuki

Takuya Fujimoto

Kozo Yoshimura

Chisato Omori

Hiroaki Koga

Tsukasa Kitatani

A tire includes a tread portion including first and second tread edges, circumferential grooves, and land portions. The land portions include a crown land portion, a first middle land portion, and a second middle land portion. Under a 50% loaded condition, the first middle land portion, the crown land portion, and the second middle land portion respectively have axial widths W, Wc, and Wof ground contact surfaces, the widths satisfying the following formula, W>Wc>W. The crown land portion includes an outer ground contact surface and an inner ground contact surface. The outer ground contact surface and the inner ground contact surface respectively have widths Wco and Wci in the tire axial direction, the widths satisfying the following formula, Wco>Wci.

Tire

A tire for which a mounting direction to a vehicle is specified, has a tread portion axially divided into five land portions each provided with sipes. The five land portions are a first shoulder land portion, a first middle land portion, a crown land portion, a second middle land portion, and a second shoulder land portion having ground contacting surface widths W, W, Wc, Wand W, respectively, which satisfy the following condition: W>W>Wc>W=>Wunder a 50% load state of the tire.

A tire comprises a tread portion comprising circumferential grooves and land portions divided thereby. The land portions include a first shoulder land portion and a first middle land portion adjacent thereto. The first shoulder land portion is provided with first shoulder sipes. The middle land portion is provided with first middle sipes. Each of the first shoulder sipes and the first middle sipes comprises a main portion extending in the tire radial direction, and a widened portion having a width greater than the main portion and opened at the tread surface of the land portion. The opening width of the first shoulder sipe at the tread surface is larger than the opening width of the first middle sipe at the tread surface.

A tire includes a tread portion including first and second tread edges, three or more circumferential grooves, and four or more land portions. The circumferential grooves include a first shoulder circumferential groove nearest to the first tread edge. Each land portion is provided with only sipes and is not provided with lateral grooves. The land portions include a first shoulder land portion having the first tread edge, and a first middle land portion adjacent to the first shoulder land portion. The first middle land portion is provided with first middle sipes traversing the first middle land portion completely in the tire axial direction. The first shoulder land portion is provided with first shoulder sipes extending from the first shoulder circumferential groove to the first tread edge. The first shoulder sipes have a circumferential pitch length smaller than a circumferential pitch length of the first middle sipes.

Tire for automobile

Provided is a 5-rib tire that can have improved steering stability and noise performance A tread portionincludes four circumferential groovesand five land portions. Two tread ends are ends of a 50%-load ground-contact surface. Each of the five land portionsis provided with no groove having a groove width greater than 2.0 mm, and is provided with only sipes. The five land portionsinclude a shoulder land portion. The shoulder land portionis provided with a plurality of shoulder sipes. At least one of the shoulder sipesincludes an inclined portionand an axial portion. The axial portioncross the tread end.

A tread portionincludes four circumferential groovesand five land portions. Each of the five land portionsis provided with no groove having a groove width greater than 2.0 mm, and is provided with only sipes. The four circumferential groovesinclude a shoulder circumferential groove. The five land portionsinclude a shoulder land portionand a middle land portion. The middle land portionis provided with a plurality of middle sipes. The shoulder land portionis provided with a plurality of shoulder sipeseach extending from the shoulder circumferential grooveto a position beyond a tread end. At least one of the shoulder sipesincludes an inclined portion. A maximum angle of the inclined portionwith respect to a tire axial direction is not greater than a maximum angle of the middle sipewith respect to the tire axial direction. A difference between the maximum angle of the inclined portionand the maximum angle of the middle sipeis not greater than 5°.

A tire that includes a tread portion having a designated mounting direction to a vehicle can comprise: an outer shoulder land portion having a greatest width, in the tire axial direction, of a ground contact surface among five land portions. The outer shoulder land portion can include a plurality of outer shoulder sipes connected to an outer shoulder circumferential groove. An outer middle land portion can include a plurality of outer middle sipes extending completely across the outer middle land portion in the tire axial direction. The outer shoulder sipes and the outer middle sipes each can include a pair of sipe walls. The outer shoulder sipes and the outer middle sipes can each include a body portion in which the pair of sipe walls are disposed substantially parallel to each other. A width of a body portion of each outer shoulder sipe can be greater than a width of a body portion of each outer middle sipe.

A tire includes a tread portion including four circumferential grooves extending continuously in the tire circumferential direction and five land portions divided by the four circumferential grooves. The five land portions include a first middle land portion located between a first tread edge and a tire equator. The first middle land portion is provided with first middle sipes inclined with respect to a tire axial direction and fully traversing the first middle land portion in the tire axial direction. Each first middle sipe includes a pair of sipe edges, and at least one of the pair of sipe edges opens at the ground contact surface via a chamfer portion over an entire length thereof. The chamfer portion has a chamfer width increasing continuously from a first longitudinal edge to a second longitudinal edge of the first middle land portion.

A tire includes a tread portion including four circumferential grooves between outboard and inboard tread edges, and five land portions divided by the circumferential grooves. The circumferential grooves include an inboard shoulder circumferential groove located nearest to the inboard tread edge in the circumferential grooves. The land portions include an inboard shoulder land portion disposed axially outward of the inboard shoulder circumferential groove and having a ground contact surface with the smallest axial width in the land portions. The inboard shoulder land portion is provided with inboard shoulder lateral grooves and inboard shoulder sipes. The inboard shoulder lateral grooves include inner ends away from the inboard shoulder circumferential groove. The inboard shoulder lateral grooves extend axially outward from the inner ends to a location beyond the inboard tread edge. The inboard shoulder sipes extends from the inboard shoulder circumferential groove to a location beyond the inboard tread edge.

A tread portioncan include an inner tread end, an outer tread end, circumferential grooves, and land portions. The circumferential grooves can include an inner shoulder circumferential groove and an outer shoulder circumferential groove. The land portions can include an inner shoulder land portion and an outer shoulder land portion. The inner shoulder land portion can include inner shoulder lateral grooves and inner shoulder sipes. The outer shoulder land portion can include outer shoulder lateral grooves and outer shoulder sipes. Each outer shoulder sipe can have a chamfered portion at each of sipe edges on both sides. The chamfered portion can have a chamfered width that increases from a terminating end side toward the outer shoulder circumferential groove.

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Kobe, Japan

Ryota Ikeda