Wheel Rim Power Reception Layout for Obstacle-Resistant Wireless Charging
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Solution Overview
Problem
Existing power reception devices on vehicle wheels are susceptible to efficiency reduction due to obstacles interfering with wireless power transmission from road-based power transmission devices.
Innovation Solution
A tire/wheel assembly with a power reception device on the outer peripheral surface of the rim, a non-magnetic tread portion, and a relay device on the inner peripheral surface, optimized to enhance power reception efficiency through electromagnetic induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a power reception device is installed on the underside of the vehicle to receive wireless power from a road-based power transmission device, then wireless power supply is enabled, but obstacles such as metal or small animals may enter the space between the power reception device and the power transmission device, reducing power reception efficiency
Solution Approach 1:
The patent moves the power reception device from the traditional underside location to the wheel rim, changing the spatial dimension of power reception. This dimensional shift allows the reception coil to be positioned on the outer peripheral surface of the rim, where it can receive power from a road-based transmission device without being blocked by obstacles in the traditional gap space.
Solution Approach 2:
The tire acts as an intermediary medium between the power transmission device and the power reception device on the wheel rim. The tire's non-magnetic material properties allow magnetic field penetration while physically separating the reception coil from potential obstacles, mediating the power transfer process effectively.
2Use of energy by moving object
If the tire sidewall gauge is increased to 1.5 mm or more to improve structural integrity and reduce magnetic interference, then power reception efficiency is improved, but tire weight and manufacturing complexity increase
Solution Approach 1:
The patent specifies a minimum sidewall gauge of 1.5 mm as an optimal parameter that balances multiple requirements: it provides sufficient structural strength, ensures adequate non-magnetic material thickness for magnetic field penetration, and maintains reasonable weight. This parameter optimization resolves the contradiction between efficiency and weight.
Solution Approach 2:
The tire is constructed using composite materials with specific non-magnetic properties that allow magnetic field penetration while maintaining structural integrity. The combination of non-magnetic rubber compounds and appropriate sidewall thickness creates a material system that satisfies both power reception efficiency and weight constraints.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves power receiving efficiency by minimizing interference from obstacles and optimizing material composition to enhance magnetic field transmission.
Implementation Method 1
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
Implementation Method 2
relay device disposed on an inner peripheral surface side of the rim and connected electrically to the wiring, characterised in that the relay device is configured by a relay coil attached to the inner peripheral surface of the rim
Data Source
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AI summary
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.