Bridgestone Corporation

Bridgestone/firestone, Inc.

Bridgestone Firestone North American Tire, LLC

Bridgestone Americas Tire Operations, LLC

Yasuo Himuro

Yuji Tateo

Yasuhiro Hamada

Sotaro Iwabuchi

Toshio Hayakawa

Ichiro Takahashi

Toru Tsuda

Jon Irvin Stuckey

Atsushi Miyasaka

Kazunori Shinohara

Richard J Wright

Christopher L Whetzel

James G Guspodin

Keith A Dumigan

Paula R Lundgren

Takayuki Fukunaga

David M Reep

Dyta Itoi

Yuji Kato

Katsuhiko Kinoshita

Toru Fukuoka

Ryuiti Sasaki

Hiroshi Sato

Takamitsu Nakamura

Hiroshi Imai

John J Regallis

Bill J Wallet

William B Allison

Isao Kuwayama

Yoshihiro Hosoya

Leonard F Blankenship

Daita Itoi

Francis J Byrne

Tetsuhito Tsukagoshi

Masaharu Kimura

Naoko Ishikawa

Kojiro Yamaguchi

Elizabeth M Beutler

Masashiro Moriya

Shinichi Watanabe

Toru Osawa

Teruyuki Tominaga

Hidenori Masuda

Tetsuro Kobayashi

Masato Hiruma

Masayuki Tokutake

Takahiro Tahira

Nobuyuki Watanabe

Keita Ide

Shawn L Copeland

John P Rodak

Toshihiro Sadohara

Kenichi Kanazawa

Toshiyuki Mitsutake

Yukio Yamakawa

Toru Sasagawa

Atsusi Miyasaka

Nobukazu Shimizu

Yoshihiko Ichikawa

David C Spragg

Andrew Svenson

Seiichirou Kawai

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 pneumatic tire has a pair of bead portions each having a bead core embedded therein, a pair of sidewall portions extending radially outwardly from bead portions, a tread portion extending across both side wall portions, an annular outer decorative portion arranged radially outward and formed by means of printing on a side portion consisting of the sidewall and bead portions, and an annular inner decorative portion arranged radially inward of the outer decorative portion and formed by means of printing on the side portion. The inner decorative portion is provided with decoration in which first inner elements and second inner elements are alternately arrayed in a circumferential direction of the tire. The outer decorative portion is provided with decoration different from the decoration provided on the inner decorative portion.

A tire includes an annular decoration printing portion, at least a portion thereof being provided on an outer surface of a side portion further toward a tire radial direction outer side than a tire maximum width position. The decoration printing portion includes an annular design portion and an annular gradation portion provided at least on the tire radial direction outer side of the design portion. The gradation portion incrementally decreases in value outward in the tire radial direction, with a value of 100% being a pure color and a value of 0% being pure black in an HSV color space.

The present invention provides a tire capable of effectively enhancing the visibility of marks. The tire is provided with a markon a surface of a side portion, in which the markis formed so as to vary at least one of the hue, brightness and saturation.

Tire

A pneumatic tireaccording to the present invention includes a plurality of turbulence generation ridgeswhich extend on a surface of a tire side portionin a tire-radial direction and which are arranged at a pitch in a tire-circumferential direction. A protrusionrising from the surfaceof the tire side portionis formed in the tire side portion. Either an inner end portionA of the turbulence generation ridgeor an outer end portionB of turbulence generation ridgeis smoothly continuous to a surface of the protrusion. An inner end height (H), which is a height of the inner end portionA from the surfaceof the tire side portion, is larger than an outer end height (H), which is a height of the outer end portionB from the surfaceof the tire side portion

Tire tread

Tread portion of an automobile tire

A pneumatic tire comprises a tread portion having a plurality of slant grooves, in which each slant groove has a steeply slant groove portion and a gently slant groove portion, and the steeply slant groove portion comprises a pseudo-land part of a given shape, and can improve a drainage performance without sacrificing the other tire performances.

Pneumatic tire including pseudo-land part

A pneumatic radial tire for all-season passenger car comprises a tread with a tread block pattern defined by plural slant grooves and at least one circumferential center groove and consisting of a central zone having a width corresponding to 30-60% of a tread width and a pair of side zones located on both sides of the central zone, wherein the slant grooves comprise steeply slant grooves and gently slant grooves each having a given shape, and the number of the gently slant grooves is made two times or more than the number of the steeply slant grooves, and the block is provided with at least one sipe, and each of the blocks defined by the circumferential center groove and the steeply slant grooves is chamfered from a tapered top end over a given range toward a longitudinal direction of the block.

Pneumatic radial tire for all-season passenger car

Growing community of inventors

Tokyo, Japan

Yasuo Himuro