Sumitomo Rubber Industries Limited

Honda Giken Kogyo Kabushiki Kaisha

Hiroaki Sakuno

Masaki Shiraishi

Yoshihide Kojima

Masao Takami

Hiroyuki Nakagawa

Yoshinobu Miyanaga

Kiichiro Kakumu

Syuichi Yamamori

Yoshiichiro Iwahashi

Shigeaki Suzuki

Makoto Onoda

Katsunori Kadowaki

Youichiro Hirosawa

A pneumatic tire having a tread portion capable of reducing the running noise. The tread portion is provided with a circumferentially extending main groove and lateral grooves extending from the main groove towards one side thereof, the circumferential pitches of the lateral grooves including at least two different pitches. The width of the main groove at the groove top is substantially constant along its length, but the sectional area is changed along its length such that

Pneumatic tire including pitches

A pneumatic tire has a tread pattern with blocks which are divided by two circumferential grooves extending in the circumferential direction of a tire and eighty-five or more lateral grooves crossing the circumferential grooves in a tread part. In the tread pattern, the quotient S.sub.T /S of the total groove area S.sub.T which is the sum of the circumferential groove area S.sub.G and the lateral groove area Sg in a ground contact surface S when the tire is mounted on a standard rim, inflated with a normal internal pressure and loaded with a normal load, to the ground contact area S is in a range from 0.15 to 0.25, and the rate Sg/S.sub.G of the lateral groove area Sg to the circumferential groove area S.sub.G is in a range from 0.33 to 0.53.

Pneumatic tire

A pneumatic tire which comprises a carcass and a band disposed radially outside the carcass, the band made of parallel cords wound spirally around the breaker, the band comprising a plurality of circumferential portions which are at least one parallel cord portion in which the windings of the band cords are laid in parallel with the tire equator and at least one inclined cord portion in which the windings of the band cords are laid at an inclination angle of 0.3 to 5 degrees to the tire equator, and the total circumferential length of the at least one inclined cord portion being not more than 50% of the whole circumferential length of the band.

Breaker with wound band

Method for manufacturing an assembly of a belt, a band, and a tread

Automobile tire

Growing community of inventors

Fukushima, Japan

Hiroaki Sakuno