The Yokohama Rubber Co., Ltd.

Masahiro Naruse

Takashi Hoshiba

Takahiro Okamatsu

Jun Matsuda

Tatsuro Shinzawa

Hideyuki Takahara

Eiji Shinohara

Heishiro Fudo

Yuki Ono

Shinya Ichise

Hiroyuki Tobari

Kazuya Ishiguro

A pneumatic tire includes a sound absorbing member having a band shape. The sound absorbing member is bonded to an inner surface of a tread portion along a tire circumferential direction. The sound absorbing member includes a missing portion at at least one location in the tire circumferential direction. The at least one missing portion is disposed in a range corresponding to a light point in a tire main body. A correction body for correcting weight unbalance is fixed to a tire inner surface in the missing portion within the range corresponding to the light point.

Pneumatic tire

A pneumatic tire includes: a tread portion extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion; and a pair of bead portions disposed on an inner side in a tire radial direction of the sidewall portions. The tire is embedded with a transponder covered with a covering layer. A modulus M50 (0° C.) at 50% deformation at 0° C. of the covering layer is in a range of from 0.5 MPa to 2.0 MPa, and a modulus M50 (−20° C.) at 50% deformation at −20° C. of the covering layer and the modulus M50 (0° C.) at 50% deformation at 0° C. of the covering layer satisfy a relationship 1.0<M50 (−20° C.)/M50 (0° C.)≤2.5.

Provided are a pneumatic tire and a method for manufacturing the same. At least one sensor unit including a sensor that acquires tire information is fixed to a tire inner surface via an adhesive layer, and an amount of silicon in a release agent detected by fluorescent X-ray analysis at least in a fixing region for the sensor unit is from 0.1 wt % to 10.0 wt %.

Pneumatic tire and method for manufacturing the same

A pneumatic tire is vulcanized by using a bladder provided with a coating layer formed by a release agent, and the release agent has a thickness, detected by an electron microscope, of 0.1 μm to 100 μm on an inner surface of a tread portion

Pneumatic tire and method of manufacturing the same

A pneumatic tire that is vulcanized using a bladder provided with a coating layer formed by a release agent, a noise absorberbeing fixed on an inner surface of a tread portionalong a tire circumferential direction via an adhesive layer, and a thickness of the release agent detected by an electron microscope is 0.1 μm to 100 μm at least in a fixation region for the noise absorber

A wear state detection device includes an element configured to generate voltage based on deformation of a tread portion during tire rotation, a voltage detection unit configured to detect the voltage generated by the element, a speed detection unit configured to detect vehicle speed or tire rotation speed, a storage area configured to store waveform data over time of the voltage detected by the voltage detection unit together with the vehicle speed or the tire rotation speed detected by the speed detection unit, a calculation unit configured to calculate frequency of exceedance of a predetermined threshold value based on the waveform data in a predetermined speed range and a predetermined time period stored in the storage area, and a determination unit configured to determine a progress condition of wear of the tread portion based on the frequency of exceedance of the predetermined threshold value calculated by the calculation unit.

Tire wear state detection device using waveform data

A wear-condition-sensing device includes an element configured to generate voltage based on deformation of a tread portion during tire rotation, a voltage detection unit configured to detect the voltage generated by the element, a storage area configured to store waveform data over time of the voltage detected by the voltage detection unit, a calculation unit configured to calculate an index value of voltage change based on the waveform data stored in the storage area, and a determination unit configured to determine a progress condition of wear of the tread portion by comparing the index value calculated by the calculation unit with reference information.

Wear-condition-sensing device

In a pneumatic tire with a carcass layer mounted between a pair of bead portions, a transponder is embedded in an outer side of the carcass layer in the tire width direction, a rubber member having the largest storage modulus at 20° C. of rubber members located on an outer side of the transponder in the tire width direction has a modulus M50out(0° C.) during 50% deformation at 0° C. and a modulus M50out(−20° C.) during 50% deformation at −20° C. that satisfy a relationship 0.50≤M50out(0° C.)/M50out(−20° C.)<1.00, and a rubber member having the largest storage modulus at 20° C. of rubber members located on an inner side of the transponder in the tire width direction has a modulus M50in(0° C.) during 50% deformation at 0° C. and a modulus M50in(−20° C.) during 50% deformation at −20° C. that satisfy a relationship 0.25≤M50in(0° C.)/M50in(−20° C.)<1.00.

Provided is a pneumatic tire including an indicator made of a protrusion portion or a recess portion extending in a tire circumferential direction is formed on a tire inner surface. A sound absorbing member or a sealant layer is applied to the tire inner surface along the indicator.

A pneumatic tire is vulcanized using a bladder provided with a coating layer formed of a release agent, and includes a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction. The amount of silicon of the release agents detected in at least a placement region of the sealant layer by fluorescence X-ray analysis is from 0.1 wt. % to 10.0 wt. %.

Pneumatic tire and method of manufacturing same

An object of the present invention is to provide a tire sealant and a tire repair kit that exhibit excellent injectability. Provided is a tire sealant including a natural rubber latex, a synthetic resin emulsion, an anti-freezing agent, a surfactant, and a chelating agent, wherein the content of the chelating agent is 0.1 mass % or greater.

Tire sealant and tire repair kit

A pneumatic tire that is vulcanized using a bladder provided with a coating layer comprising a release agent, the noise absorber being fixed to the inner surface of the tread portion along the tire circumferential direction via the adhesive layer, and the amount of silicon in the release agent detected by X-ray fluorescence analysis is 0.1 wt. % to 10.0 wt. % at least in the fixation region for the noise absorber.

A tire noise reduction device includes a sound absorbing member made of a porous material; and a band member disposed between the sound absorbing member and the tire inner surface and provided for attaching the sound absorbing member to a tire inner surface, the band member including chamfered portions on both surface sides at both ends in a width direction of the band member.

Tire noise reduction device and pneumatic tire provided with same

A pneumatic tire is vulcanized using a bladder provided with a coating layer formed of a release agent, and includes a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction, the release agent having a thickness of from 0.1 &#x3bc;m to 100 &#x3bc;m in at least a placement region of the sealant layer, detected using an electron microscope.

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Hiratsuka, Japan

Masahiro Naruse