Bridgestone Corporation

Nsk Corporation

The University of Tokyo

Isao Kuwayama

Osamu Shimizu

Hiroshi Fujimoto

Daisuke Gunji

Yasumichi Wakao

Keizo Akutagawa

Shintaro Hatanaka

Takashi Shimura

Kentaro Kozuki

Takehiro Imura

Katsuhiro Hata

A pneumatic radial tire for passenger vehicles that satisfies a defined relationship between sectional width SW and outer diameter OD of the tire, and includes only two circumferential main grooves extending in a tire circumferential direction on a tread contact surface, a barycenter of the circumferential main grooves being positioned in a half portion of the tire on a vehicle-mounted outward side, which is one side of the tire in a tread width direction with a tire equatorial plane as a boundary. A drop height (or ground contact length relationship, or tread gauge relationship) is also defined.

Pneumatic radial tire for passenger vehicles

A pneumatic radial tire for passenger vehicles that satisfies a defined relationship between sectional width SW and outer diameter OD of the tire, and includes only two circumferential main grooves extending in a tire circumferential direction on a tread contact surface, a barycenter of the circumferential main grooves being provided to a half portion of the tire on a vehicle-mounted inward side, which is one side of the tire in a tread width direction with a tire equatorial plane as a boundary. A drop height (or ground contact length relationship, or tread gauge relationship) is also defined.

A tire comprises: a belt composed of one or more belt layers; a main groove on a tread surface; and a communication device embedded at a position that is inward in a tire radial direction from a groove bottom of the main groove, outward in the tire radial direction from an inner surface of an innermost belt layer in the belt, and outward in a tire width direction from a minimum width belt layer in the belt, wherein a tire radial outer side of the communication device is not covered with the belt.

Tire, retreaded tire, and retreaded tire production method

A tire-wheel assembly includes: a wheel having a rim portion at least part of which is formed of a non-magnetic material; and a tire mounted on the rim portion, in which a tread portion includes a belt formed of a non-magnetic material. The wheel includes, inside the rim portion in a tire radial direction, a container portion that contains a power receiving device that receives electric power supplied wirelessly from outside of the tire in the tire radial direction. The tire includes bead fillers. When BFH represents a radial height of the bead fillers and SH represents a tire cross-sectional height, 0.1≤BFH/SH≤0.5 holds true.

Tire-wheel assembly, tire, and wireless power receiving system

A wireless power reception systemincludes: a power reception deviceincluding a power reception coilthat receives power supplied wirelessly from a power transmission coilof a power transmission deviceinstalled in a road surface, at least a portion of the power reception coilbeing housed in a wheelof a moving body; and a driving devicewhich is installed in the wheeland which drives the wheelwith power received by the power reception device, wherein the power reception deviceis provided with a converterand an inverter, at least a portion of the converterand at least a portion of the inverterare housed in the wheel, the converteris positioned vertically above the power reception coil, and the inverteris positioned vertically above the converter

Wireless power reception system, moving body, and wheel

A wireless power reception systemincludes: a power reception deviceincluding a power reception coilthat receives power supplied wirelessly from a power transmission coilof a power transmission deviceinstalled in a road surface, at least a portion of the power reception coilbeing housed in a wheelof a moving body; and an onboard devicewhich is installed in the moving bodyand which is electrically connected to the power reception device, wherein the power reception devicecan transmit received power to the onboard device, and the power reception coilincludes a stacked plurality of spiral coil layersand

A wireless power reception system includes a power transmission device, a power reception device, a wheel with a rim, and a tire mounted on the rim. The tire includes a bead core and a bead filler, a tire width direction cross-sectional area Sof the bead filler is one to eight times a tire width direction cross-sectional area Sof the bead core, the power transmission device can transmit electric power with a frequency of 1000 kHz or less wirelessly, the power reception device is disposed farther inward in the tire radial direction than a tread portion of the tire, the power reception device receives the electric power wirelessly from the power transmission device in a state such that the power transmission device is located farther outward in the tire radial direction than the tire, and the tread portion of the tire is formed from a non-magnetic material.

Wireless power reception system, tire/wheel assembly, and tire

A tire/wheel assembly includes a wheel including a disk and a rim, the wheel having a power reception device attached to an inner peripheral surface of the rim to receive electric power supplied wirelessly from farther outward in a radial direction of the wheel than the rim, and a tire attached so as to cover an outer peripheral surface of the wheel and including a pair of bead portions. Each bead portion in the pair of bead portions includes a bead core and a bead filler, and 0.1≤BFW/BDW≤0.6, where BFW is a width in a tire width direction at a central position of the bead filler in a tire radial direction, and BDW is a maximum width in the tire width direction of the bead core.

Tire/wheel assembly and tire

A tire/wheel assembly includes a wheel including a disk and a rim, the wheel having a power reception device attached to an outer peripheral surface of the rim to receive electric power supplied wirelessly from farther outward in a radial direction of the wheel than the rim, and a tire attached so as to cover an outer peripheral surface of the wheel and including a pair of sidewall portions. A gauge of the sidewall portions is 1.5 mm or more.

A wireless power receiving system includes: a power receiving device having a power receiving coil configured to receive electric power supplied wirelessly from a power transmission coil of a power transmission device installed on a road surface, at least part of the power receiving coil being contained in a vehicle wheel; and in-vehicle devices installed in a mobile object, the in-vehicle devices being energizably connected to the power receiving device. The power receiving device transmits the received electric power to the in-vehicle devices.

Growing community of inventors

Tokyo, Japan

Isao Kuwayama