Sumitomo Rubber Industries Limited

Ayuko Yamada

Mutsuki Sugimoto

Kenichi Uesaka

Takahiro Kawachi

Masako Nakatani

Subaru Toya

Hiroshi Ito

Takuya Horiguchi

Tatsuhiro Tanaka

Takayuki Nagase

Shuichiro Ono

Keiji Takagi

Fumiya Kato

Keiichi Nakadera

Tetsuya Maekawa

Natsuki Maekawa

Jun Okamoto

Satomi Yamauchi

Nanaho Kami

Masataka Hiro

Kentaro Nakamura

Daiki Mukouguchi

Daiki Mukoguchi

Daichi Fuji

A pneumatic tireincludes a carcassextending between bead cores of bead portions via a tread portionand sidewall portions, and a belt layerarranged on an outer side in a tire radial direction of the carcassand inside the tread portion. The pneumatic tirehas a noise damperarranged on an inner cavity surface of the tread portion. Glass transition temperature of the noise damperis in a range of from −55 degrees Celsius to −45 degrees Celsius.

Pneumatic tire

A pneumatic tirecomprises a carcassextending between bead cores of bead portions via a tread portionand sidewall portions, and a belt layerarranged on an outer side in a tire radial direction of the carcassand inside of the tread portion. The pneumatic tirefurther comprises a damping rubber bodyarranged between the carcassand the belt layer, and a noise damperarranged on an inner cavity surface of the tread portion. A width Win a tire axial direction of the damping rubber bodyis in a range of from 60% to 130% of a width Win the tire axial direction of the belt layer, and a water absorption rate of the noise damperis in a range of from 10% to 25%.

To be capable of preventing deterioration of uniformity after puncture repair while suppressing running noise. [Solution] A pneumatic tirecomprises a noise damperfixed to a tire inner cavity surface of a tread portionand formed of a porous material. The noise damperincludes a first partarranged on an outer side in a tire radial direction and fixed to the tire inner cavity surface, and a second partarranged on an inner side in the tire radial direction of the first partand exposed in a tire inner cavity. A water absorption rate of the first partcalculated by a following formula (1) is in a range of from 5% to 25%. Air permeability of the second partmeasured in accordance with Japanese Industrial Standard JIS-L1096 is in a range of from 1 to 7 cm3/cm2/s. The formula (1) is:water absorption rate (%)=weight change before and after immersion (g)/volume at 50% compression (cm3)&#xd7;100 &#x2003;&#x2003;(1).

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Kobe, Japan

Ayuko Yamada