Fiber Composite EV Wheel with Damped Motor Mount
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Solution Overview
Problem
Electric vehicle wheels with integrated motors suffer from high mass, high moment of inertia, and susceptibility to shock loads due to motor placement in the rim, which affects efficiency, stability, and durability.
Innovation Solution
A wheel body design featuring a rim body and a motor receiving body with a transmission portion that decouples drive torque from shock forces, using fiber plastic composites and active damping elements to transmit torque efficiently while isolating shock impacts, and incorporating foam and piezoceramic materials for enhanced damping and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electric motor is integrated into the wheel rim, then the wheel can provide individual drive at each wheel, but the wheel mass and moment of inertia increase significantly
Solution Approach 1:
The wheel body is divided into functionally independent parts: a rim body for structural support and a separate motor receiving body for housing the electric motor. This segmentation allows the motor to be positioned optimally for performance while keeping the wheel assembly lightweight and modular.
Solution Approach 2:
The electric motor is nested within the motor receiving body, which is itself integrated into the wheel body structure. This nested arrangement consolidates multiple functions into a compact configuration, reducing overall wheel mass while maintaining individual wheel drive capability.
2Adaptability or versatility
If the electric motor is placed in the wheel rim, then individual wheel drive is achieved, but the motor is exposed to severe shock loadings
Solution Approach 1:
The electric motor is extracted from direct exposure to shock loadings by positioning it within the motor receiving body, which is designed to isolate the motor from the rim's shock exposure while maintaining functional integration.
Solution Approach 2:
The motor receiving body incorporates damping elements and is positioned to provide protective cushioning against shock loads before they reach the electric motor, preserving motor reliability under severe operating conditions.
3Device complexity
If traditional wheel designs are used, then structural simplicity is maintained, but shock forces are transmitted directly to the motor
Solution Approach 1:
The motor receiving body acts as an intermediary structure between the rim body and the electric motor. It includes damping elements that mediate the transmission of forces, filtering out shock loads while allowing torque transmission, thus protecting the motor without significantly complicating the overall wheel structure.
Solution Approach 2:
The wheel body utilizes fiber plastic composite materials that provide both structural integrity and inherent damping properties. These composite materials absorb and dissipate shock forces before they reach the motor, maintaining reliability while keeping the design relatively simple.
4Weight of moving object
If fiber plastic composites are used for the wheel body, then weight is reduced and damping is improved, but manufacturing complexity increases
Solution Approach 1:
The wheel body is segmented into the rim body and motor receiving body as separate components that can be manufactured independently using fiber plastic composites. This segmentation allows for specialized manufacturing processes for each part while maintaining the weight and damping benefits of composite materials.
Solution Approach 2:
The rim body and motor receiving body are merged into a single integrated wheel body structure through composite manufacturing techniques. This merging achieves weight reduction and improved damping while the modular design approach keeps manufacturing complexity manageable.
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 design achieves a lightweight, efficient, and durable wheel that effectively transmits drive torque while minimizing shock impacts on the electric motor, enhancing the overall performance and longevity of electric vehicle wheels.
Implementation Method 1
The wheel body (102) comprises a fiber plastic composite
Implementation Method 2
incorporating foam and piezoceramic materials for enhanced damping
Implementation Method 3
incorporating foam and piezoceramic materials for enhanced damping
Data Source
AI summary
One or more embodiments of the present invention concerns a wheel body of a wheel of an electric vehicle including a rim body with a rim portion for receiving a tire and a spoke portion for carrying the rim portion on a bearing for rotatably mounting the rim body on a wheel axle, a motor receiving body for receiving an electric motor for driving the wheel, and the motor receiving body includes an outer, radially surrounding receiving portion for receiving and fixing an outer part of the electric motor, which part is rotatable relative to the wheel axle.