Hollow Axle Electric Vehicle Drive System Weight Balance
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Solution Overview
Problem
Existing electric vehicles face challenges in achieving weight balance due to the heavy motor and drive system components being disposed on one side of the wheel, leading to protrusion issues and difficulty in compactly integrating the drive system.
Innovation Solution
The electric vehicle design features a hollow cylindrical axle coaxially connected to the wheel, with the motor on one side and the reduction mechanism on the other, allowing the motor shaft to pass through the axle, thereby achieving weight balance and compactly integrating the drive system without protrusion. Additionally, modularization of the motor and reduction mechanism modules facilitates easy mounting, removal, and replacement, and the use of bearings for rotational support enhances operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor and drive system components are disposed on one side of the wheel, then the drive system can be simplified and easier to manufacture, but weight balance is difficult to achieve and the drive system protrudes from the wheel
Solution Approach 1:
The drive system is segmented into two separate modules: the motor module disposed on one side of the wheel and the reduction mechanism module disposed on the other side. This segmentation allows the heavy motor to be counterbalanced by the reduction mechanism, achieving weight balance while maintaining manufacturing simplicity through modular construction
Solution Approach 2:
The reduction mechanism module serves as a counterweight to the motor module. By positioning the reduction mechanism on the opposite side of the wheel from the motor, the heavy components are balanced, preventing weight imbalance and protrusion while maintaining ease of manufacture through standardized modular components
2Device complexity
If the motor and reduction mechanism are disposed on one side of the wheel, then the drive system structure is simplified, but the drive system protrudes from the wheel and weight balance is difficult to achieve
Solution Approach 1:
The drive system is divided into two compact modules positioned on opposite sides of the wheel. This segmentation enables each module to be compactly integrated into the wheel structure without protrusion, while the overall system remains simple through modular design
Solution Approach 2:
The motor shaft is positioned to pass through the hollow portion of the cylindrical axle, utilizing the axial dimension of the wheel. This dimensional arrangement allows both the motor module and reduction mechanism module to be compactly integrated on opposite sides without protruding from the wheel's overall shape
3Ease of manufacture
If both the reduction mechanism and brake are disposed on one side of the wheel, then the drive system is easier to manufacture, but weight balance becomes more difficult to achieve
Solution Approach 1:
The drive system components are segmented such that the motor and its associated components form one module on one side of the wheel, while the reduction mechanism forms a separate module on the other side. This segmentation achieves weight balance while maintaining manufacturing ease through modular assembly
Solution Approach 2:
The reduction mechanism module positioned on the opposite side of the wheel from the motor acts as a counterweight, balancing the heavy motor components. This arrangement achieves weight balance while keeping the manufacturing process simple through standardized modular components
Data Source
AI summary
An electric vehicle includes an axle that is a hollow cylindrical shaft. A motor shaft is inserted into a hollow portion of the axle substantially coaxially with the axle. In this case, on one side of a wheel, a motor is connected to a base end of the motor shaft extending from one end of the axle. Also, on the other side of the wheel, a reduction mechanism is connected to a leading end of the motor shaft extending from the other end of the axle.