Bridgestone Corporation

Bridgestone Americas Tire Operations, LLC

Kabushiki Kaisha Bridgestone

Bridgstone Corporation

Sotaro Iwabuchi

Yasuo Himuro

Shungo Fujita

Takayuki Fukunaga

Paula R Lundgren

Jon Irvin Stuckey

Takamitsu Nakamura

Keiichi Kato

Yuichiro Ogawa

Dyta Itoi

Daita Itoi

Takaaki Kojima

Atsushi Miyasaka

Shiho Kamada

Naoko Ishikawa

Kensuke Dobashi

Hikaru Inagaki

Yusaku Ishiguro

Toshiyuki Ishiguro

Seiichirou Kawai

A tire according to the present disclosure includes, on the tire outer surface, a first region including an uneven surface formed by a convex portion arranged throughout the first region, and a second region including an uneven surface formed by a plurality of ridges arranged in parallel throughout the second region, the second region being arranged adjacent to the first region. The minimum separation distance between apices of the convex portion in the first region is shorter than the minimum separation distance between apices of two adjacent ridges in the second region.

Tire

Tire sidewall

A pneumatic tire including: a tread portion is in contact with a road surface; and a side wall portion is continuous to the tread portion and positioned inside a tire radial direction of the tread portion. A large region including a plurality of small regions having different arithmetic average roughness outside in a tire width direction is formed on outer surface of the side wall portion. A plurality of large regions are formed along a tire circumferential direction and the tire radial direction. In a boundary line of adjacent large region, small regions having different arithmetic average roughness come into contact with each other.

Pneumatic tire

A tire includes a circumferential direction groove and plural protrusions. The circumferential direction groove is formed in a tread face so as to open toward an outer side in a tire radial direction. The plural protrusions are formed so as to project to a projection height of from 0.1 mm to 1.0 mm from a groove bottom face or a groove side face of the circumferential direction groove, and are spaced apart by a spacing of from 0.1 mm to 1.0 mm. A center line MA, MB linking a center point of a leading end side with a center point of a base end side of each of the plural protrusions leans with respect to a perpendicular line HA, HB such that the leading end side of the protrusion is positioned further toward a tire rotation direction upstream side than the base end side of the protrusion when viewed along a tire width direction or the tire radial direction.

Provided is a tire including: a decorative portion that is formed on an outer surface of the tire and has a base surface; and a pattern region that is provided at the decorative portion and includes plural projections projecting from the base surface and formed at an interval of from more than 0.1 mm to 1.0 mm, the plural projections having a height of from 0.1 mm to 1.0 mm, in which at least in the pattern region, the plurality of projections is inclined in one direction with respect to a normal line perpendicular to the base surface.

A tire that can suppress an unused tire from giving an impression like a worn tire as compared with a case where the brightness of a tread surface and the brightness of a bottom surface of a groove are the same is obtained. The tread portion includes a tread portion including a tread surface and a groove that partitions the tread surface; and a plurality of protrusions that protrude from a bottom surface of the groove at a height of from 0.1 mm to 1.0 mm and are arranged at an interval of from more than 0.1 mm to 1.0 mm. A ratio of a height of the protrusions to a depth of the groove (protrusion height/groove depth) is from 0.02 to 0.2 mm.

A tire includes a pattern portion that is formed on a tire surface and in which ridges are arranged in a nest shape having a center point, the ridges including ridgelines CL having a curved portion in plan view, in which a height of each of the ridges is from 0.2 mm to 0.5 mm, and adjacent ridges are arranged at a constant pitch of from 0.15 mm to 0.35 mm.

A tire including a pattern region and plural unit patterns. The pattern region is formed at an outer surface of a tire and includes a base. The plural unit patterns are formed within the pattern region, and each unit pattern is formed including extension portions having a projection height from the base of from 0.1 mm to 1.0 mm. The extension portions extend in plural directions from a bend point in plan view. A spacing between the bend points of adjacent unit patterns out of the unit patterns is from 0.2 mm to 1.0 mm.

A tire includes: a pattern portion, in which plural ridges having ridgelines are arranged adjacent to each other, on a tire surface, the ridgelines including a main body portion and a first extending portion and a second extending portion that extend in different directions from the main body portion in plan view, in which the first extending portion of a ridge and the second extending portion of an adjacent ridge at least partially overlap each other when viewed from a direction orthogonal to an adjacent direction of the ridges, a height of the ridge is from 0.2 mm to 0.5 mm, and ridges adjacent to each other are arranged at a constant pitch of from 0.15 mm to 0.35 mm.

A tire including a decorative patterned portion that is formed on a tire surface, and that is configured including plural first projections extending in a first direction in plan view and arranged spaced apart from each other in a second direction orthogonal to the first direction, and plural second projections arranged between neighboring first projections and arranged spaced apart from each other in the first direction. In plan view, each of the second projections includes a bend portion and plural extension portions extending from the bend portion.

A tire includes: a first pattern portion and a second pattern portion on a tire surface, the first pattern portion being formed of plural first ridges adjacent to each other and the second pattern portion being formed of plural second ridges extending in a different direction from the first ridges in plan view arranged adjacent to each other, in which a height of the first ridges and the second ridges is from 0.2 mm to 0.5 mm and the first ridges adjacent to each other and the second ridges adjacent to each other are arranged at a constant pitch of from 0.15 mm to 0.35 mm.

First direction ridge patterns and second direction ridge patterns are lined-up alternately at a decorative concave portion. Plural main ridgesA throughD and sub-ridgesA throughD, which project-out from a bottom surfaceA, are formed at a first direction ridge pattern. The respective ridges are disposed in parallel such that ridge extending directions are a same direction. Light reflection patterns are different at a main ridge regionand a sub-ridge region

First direction ridge patterns and second direction ridge patterns are lined-up alternately at a tire side portion. Plural main ridgesA throughD and sub-ridgesA throughD, which project-out from a bottom surfaceA, are formed at a first direction ridge pattern. The respective ridges are disposed in parallel such that ridge extending directions are a same direction. Light reflection patterns are different at a main ridge regionand a sub-ridge region

Main ridges of a first direction ridge patternand a second direction ridge patternthat are adjacent to one another are connected together. Due thereto, the main ridges are connected as one ridge from one end to another end of a decorative concave portion, and a continuous main ridgeis formed.

Growing community of inventors

Tokyo, Japan

Sotaro Iwabuchi