Tire-Wheel Assembly Layout for Efficient Wireless Power Reception
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Solution Overview
Problem
Conventional wireless power supply systems face reduced power receiving efficiency due to the generation of eddy currents when obstacles like metal or small animals enter the space between the power receiving device and the power transmission device.
Innovation Solution
A tire-wheel assembly with a non-magnetic wheel rim and tire tread, containing a power receiving device within the rim portion, which receives wireless power from outside the tire radial direction, minimizing magnetic field attenuation by obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power receiving device is installed on the underside of the vehicle, then wireless power supply can be received from the road, but obstacles may enter the space between the power receiving device and power transmission device causing eddy currents and reducing power receiving efficiency
Solution Approach 1:
The power receiving device is relocated from the traditional underside installation to a radial position within the wheel structure. This dimensional change moves the device from a horizontal plane (prone to obstacles) to a protected radial space within the wheel, eliminating the harmful gap between transmitter and receiver while maintaining wireless power reception capability
Solution Approach 2:
The power receiving device is nested within the wheel's rim structure, specifically positioned in the radial space between the rim and the tire. This nesting approach protects the device from external obstacles while utilizing the existing wheel structure as a protective enclosure, preventing metal objects and debris from causing eddy currents
2Strength
If metal materials are used for the wheel rim, then structural strength is maintained, but magnetic field attenuation occurs reducing wireless power transfer efficiency
Solution Approach 1:
The wheel rim is constructed using composite materials that combine non-magnetic components (such as aluminum alloy or plastic) with magnetic shielding elements positioned away from the power receiving device. This composite structure maintains the necessary mechanical strength while preventing magnetic field attenuation, as the non-magnetic materials do not interfere with electromagnetic wave propagation
Solution Approach 2:
The wheel rim is designed with local quality differentiation where specific regions have different material properties. The portions of the rim near the power receiving device use non-magnetic materials to minimize magnetic field attenuation, while other regions may use stronger magnetic-resistant materials only where structurally necessary, optimizing both power transfer efficiency and structural integrity
3Strength
If the bead filler height is increased to improve tire structure, then tire strength is enhanced, but the space for wireless power reception is reduced
Solution Approach 1:
The bead filler height ratio (BFH/SH) is optimized within the specific range of 0.1 to 0.5. This parameter optimization balances tire structural strength with available space for the power receiving device, ensuring that the bead filler provides sufficient structural support while leaving adequate radial space for effective wireless power reception
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 reducing magnetic field attenuation from obstacles, maintaining tire and wheel strength, and enhancing overall system performance.
Implementation Method 1
a power receiving device configured to receive electric power supplied wirelessly from outside of the tire in the tire radial direction
Implementation Method 2
an obstacle such as a piece of metal or a small animal may enter a space between the power receiving device and the power transmission device, causing eddy currents to be generated around the obstacle
Data Source
AI summary
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.