Vehicle Power Reception Coil Mounting Structure for Vibration Control
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Solution Overview
Problem
The existing contactless power reception devices in vehicles experience reduced stiffness at the center portion of the power reception coil unit, leading to vibrations and abnormal noise during vehicle travel due to the hollow center portion, which compromises the holding stability.
Innovation Solution
A vehicle-mounting structure for the contactless power reception device where the power reception coil unit is mounted on a suspension member serving as a frame member of the vehicle body, with the hollow portion of the power reception coil unit in contact with the suspension member, enhancing the holding stiffness and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power reception coil unit is supported only at the left and right end portions, then the installation structure is simple, but the center portion vibrates in the up-down direction generating abnormal noise
Solution Approach 1:
The support structure is segmented into multiple contact points: the left and right end portions are supported by mounting brackets, while the center portion is supported by the suspension member. This segmentation distributes the support function across different locations, preventing vibration of the hollow center portion and eliminating abnormal noise while maintaining installation simplicity.
Solution Approach 2:
The suspension member acts as an intermediary support element that contacts the hollow portion corresponding region of the power reception coil unit. This intermediary support prevents the hollow center portion from vibrating in the up-down direction, thereby eliminating abnormal noise without complicating the overall installation structure.
2Weight of moving object
If the center portion of the power reception coil is made hollow, then the weight is reduced, but the stiffness at the center portion is lowered
Solution Approach 1:
The suspension member serves as an intermediary support that compensates for the reduced stiffness of the hollow center portion. By providing additional support at the hollow portion corresponding region, the suspension member prevents excessive deformation and vibration, allowing the hollow design to maintain its weight advantage while restoring sufficient structural strength.
3Strength
If the power reception coil unit is mounted on the suspension member, then the holding stiffness is improved, but the device complexity increases
Solution Approach 1:
The suspension member is designed to serve multiple functions: it supports the power reception coil unit at the center portion, provides structural reinforcement to the hollow region, and integrates with the existing vehicle suspension system. This multi-functionality increases holding stiffness without significantly increasing device complexity, as the suspension member leverages existing structural elements.
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
The improved stiffness of the power reception coil unit reduces vibrations and noise during vehicle travel, ensuring a more stable and efficient power reception process.
Implementation Method 1
a contactless power feeding apparatus including a contactless power transmission device installed on a road surface and a contactless power reception device mounted in a vehicle
Data Source
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AI summary
A contactless power feeding apparatus (1) contactlessly supplies power to a vehicle (5) by way of magnetic coupling between a power transmission coil installed on a parking space and a power reception coil (83) mounted in a lower portion of a vehicle body of the vehicle (5). The power reception coil (83) is a circular coil having a hollow portion (97) formed in a center portion in a radial direction. The power reception coil (83), a resonant capacitor (89), a vehicle side magnetic member (87), and a power transmission coil side magnetic member (85) are arranged in a power reception coil unit (17). The power reception coil unit (17) is attached to a suspension member (55) which is a member element serving as a frame member of the vehicle body. A hollow portion corresponding region (113) of the power reception coil unit (17) corresponding to the hollow portion (97) is in contact with the suspension member (55).