# US 12,600,248 B2 · Power reception apparatus with relay coils arranged on tired wheel of vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,600,248 B2 - Document ID: US12600248B2 - Status: Granted - Kind: B2 - Application number: 18/214,342 - Filed: 2023-06-26 - Published: 2023-10-19 - Granted: 2026-04-14 - Earliest claimed: 2020-12-24 - Assignees: Denso Corporation; The University of Tokyo; Bridgestone Corporation - Applicants: Denso Corporation; The University of Tokyo; Bridgestone Corporation - Inventors: Hayato Sumiya; Shimpei Takita; Kazuhiro Uda; Eisuke Takahashi; Nobuhisa Yamaguchi; Hiroshi Fujimoto; Osamu Shimizu; Yasumichi Wakao; Isao Kuwayama - Web page: https://patentgrep.com/patent/US12600248B2 ## CPC - B60L 53/12: Inductive energy transfer - B60M 7/00: Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway - B60L 5/005: {without mechanical contact between the collector and the power supply line} - H02J 50/50: using additional energy repeaters between transmitting devices and receiving devices - B60L 2240/46: related to wheels - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/12: Electric charging stations - Y02T 90/14: Plug-in electric vehicles - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - B60M: POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES (control of points and safety arrangements along railway lines B61L; construction of rails and points in general E01B) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power reception apparatus is installable in a vehicle and configured to receive electric power from a power transmission coil embedded in the ground. The power reception apparatus includes: a relay coil that is arranged on a tired wheel, which includes a tire and a wheel, and includes a first coil and a second coil; a power reception coil; and a power reception circuit. The first coil and the second coil are connected with each other by an electrical conductor. The first coil is arranged inside the tire. The second coil is located so that a distance from a central axis of the tired wheel to the second coil is shorter than a distance from the central axis to the first coil. The power reception coil is located so that when the first coil faces the power transmission coil, the power reception coil faces the second coil. ## Claims ### Claim 1 A power reception apparatus installable in a vehicle and configured to receive electric power from a power transmission coil embedded in the ground, the power reception apparatus comprising: a power reception coil; a plurality of relay coils arranged on a tired wheel, which includes a tire and a wheel, the plurality of relay coils configured to relay transfer of electric power from the power transmission coil to the power reception coil; and a power reception circuit connected with the power reception coil, wherein: each of the plurality of relay coils includes a first coil and a second coil that are connected with each other by an electrical conductor; each of the first coils is arranged inside the tire; for each of the relay coils, the second coil is arranged at a position such that a distance from a central axis of the tired wheel to the second coil is shorter than a distance from the central axis of the tired wheel to the first coil; and the power reception coil is arranged at a position such that, for each of the relay coils, when the first coil faces the power transmission coil, the power reception coil faces the second coil. ### Claim 2 (depends on 1) The power reception apparatus as set forth in claim 1, wherein, for each of the relay coils: the first coil is arranged on an outer side of a rim of the wheel; and the second coil is arranged on an inner side of the rim. ### Claim 3 (depends on 1) The power reception apparatus as set forth in claim 1, wherein, for each of the relay coils: the first and second coils are located so that they overlap each other; and when viewed along an axis passing through both the first and second coils, a direction of electric current flowing through the first coil and a direction of electric current flowing through the second coil are opposite to each other. ### Claim 4 (depends on 1) The power reception apparatus as set forth in claim 1, wherein: each of the second coils is arranged outside the tire; and the tire or the wheel has a through-hole through which the electrical conductor extends. ### Claim 5 (depends on 4) The power reception apparatus as set forth in claim 4, wherein the through-hole is hermetically sealed, with the electrical conductor extending through the through-hole. ### Claim 6 (depends on 4) The power reception apparatus as set forth in claim 4, wherein the electrical conductor is formed of a litz wire or a busbar. ### Claim 7 (depends on 1) The power reception apparatus as set forth in claim 1, wherein the plurality of relay coils are arranged along a circumferential direction of the tired wheel. ### Claim 8 (depends on 1) The power reception apparatus as set forth in claim 1, wherein the power reception coil is arranged inside the wheel. ### Claim 9 (depends on 1) The power reception apparatus as set forth in claim 1, wherein, for each of the relay coils, the first coil is connected with a resonant capacitor for resonating, with respect to an inductance value of the first coil when the first coil faces the power transmission coil, at a resonant frequency of the power transmission coil. ### Claim 10 (depends on 9) The power reception apparatus as set forth in claim 9, wherein the resonant capacitor is held inside the wheel. ### Claim 11 (depends on 4) The power reception apparatus as set forth in claim 4, wherein, for each of the relay coils, the first coil is connected with a resonant capacitor for resonating, with respect to an inductance value of the first coil when the first coil faces the power transmission coil, at a resonant frequency of the power transmission coil. ### Claim 12 (depends on 11) The power reception apparatus as set forth in claim 11, wherein the resonant capacitor is arranged in the through-hole which is formed in the wheel and through which the electrical conductor extends. ### Claim 13 (depends on 1) The power reception apparatus as set forth in claim 1, wherein each of the first coils and the wheel are connected with each other by a thermally-conductive member having a higher thermal conductivity than air in the tire. ### Claim 14 (depends on 1) The power reception apparatus as set forth in claim 1, wherein each of the first coils is formed of a metal belt employed in the tire. ### Claim 15 (depends on 1) The power reception apparatus as set forth in claim 1, wherein each of the plurality of relay coils is located away from the central axis of the tired wheel.