Pneumatic tire, pneumatic tire assembly, and power supply system

A pneumatic tire assembly of a pneumatic tire mounted on a wheel, the pneumatic tire assembly comprising an element configured to receive power by receiving an AC magnetic field from an outside of the pneumatic tire,

• the pneumatic tire comprising:
• a pair of bead cores each formed in an annular shape of a bead cord made from steel;
• a carcass ply layer formed of an organic fiber cord, the carcass ply layer being wound about each of the bead cores and folded back to have a toroidal shape;
• and
• a belt layer provided in an outer side of the carcass ply layer in a tire radial direction and formed of a belt cord made of steel,
• the wheel comprising a receiver coil formed in a planar shape and provided being fixed to a wheel surface facing a tire cavity region of the pneumatic tire, the receiver coil comprising a receiving region formed in a planar shape and configured to receive an AC magnetic field transmitted through the carcass ply layer, the receiver coil being configured to generate an AC signal,
• the pneumatic tire or the wheel comprising an element fixed to the wheel surface facing the tire cavity region or to a tire inner circumferential surface of the pneumatic tire, the element being configured to receive power converted from the AC signal and be driven by the power,
• as the receiver coil is viewed from one side in a tire width direction, a surface of the receiving region of the receiver coil being provided in a region along the tire radial direction interposed between a first portion located in an outermost side of the bead cord in the tire radial direction and a second portion located in an innermost side of the belt layer in the tire radial direction, and the surface of the receiving region facing in the tire width direction, and
• when a maximum dimension of the receiving region along the tire radial direction of the receiver coil is a length D1, a distance from the receiving region of the receiver coil to a nearest portion of one of the bead cores to the receiving region of the receiver coil is a distance L1, and a distance from the receiving region of the receiver coil to a nearest portion of the belt layer to the receiving region of the receiver coil is a distance L2, the receiver coil being disposed away from the bead core and the belt layer and the distance L1 and the distance L2 being greater than a distance of one-fourth the length D1.

A power supply system configured to wirelessly transmit power from a transmitter unit to a receiver unit provided in a pneumatic tire and supply power to an element provided in the receiver unit,

• the transmitter unit comprising a transmitter coil provided in a base portion non-rotational with respect to the pneumatic tire, the transmitter coil comprising a transmission region configured to generate and transmit an AC magnetic field,
• the pneumatic tire comprising:
• a pair of bead cores each formed in an annular shape of a steel bead cord;
• a carcass ply layer formed of an organic fiber cord, the carcass ply layer being wound about each of the bead cores and folded back to have a toroidal shape;
• and
• a belt layer provided in an outer side of the carcass ply layer in a tire radial direction and formed of a steel belt cord,
• the receiver unit provided in the pneumatic tire, the receiver unit comprising:
• a receiver coil formed in a planar shape and provided in a tire cavity region of the pneumatic tire, the receiver coil comprising a receiving region formed in a planar shape and configured to receive the AC magnetic field transmitted through the carcass ply layer, the receiver coil being configured to generate an AC signal by receiving the AC magnetic field;
• and
• an element configured to receive power converted from the AC signal and be driven by the power,
• as the receiver coil is viewed from one side in a tire width direction, a surface of the receiving region of the receiver coil being provided in a region in the tire radial direction interposed between a first portion located in an outermost side of the bead cord in the tire radial direction, and a second portion located in an innermost side of the belt layer in the tire radial direction, and the surface of the receiving region facing in the tire width direction, and
• when a maximum dimension of the receiving region along the tire radial direction of the receiver coil is a length D1, a distance from the receiving region of the receiver coil to a nearest portion of one of the bead cores to the receiving region of the receiver coil is a distance L1, and a distance from the receiving region of the receiver coil to a nearest portion of the belt layer to the receiving region of the receiver coil is a distance L2, the receiver coil being disposed away from the bead core and the belt layer and the distance L1 and the distance L2 being greater than a distance of one-fourth the length D1.