Electric Vehicle Powertrain Layout With Forward Motor and Swing Arm
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Solution Overview
Problem
Existing vehicle designs limit the freedom in the layout of drive motors by swing arms and require complex configurations for transmitting power to rear wheels, restricting space utilization and assembly/maintenance efficiency.
Innovation Solution
A vehicle design utilizing an endless power transmission member to connect the drive motor with rear wheels, positioning the motor forward of the swing arms, allowing for increased layout freedom and efficient space utilization, with a motor fixing bracket for easy assembly and improved rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drive motor is positioned behind the swing arm to directly drive the rear wheel, then the power transmission structure is simple, but the layout freedom of the drive motor is limited and space utilization is reduced
Solution Approach 1:
An endless power transmission member (chain) is introduced as an intermediary between the drive motor and rear wheel. This allows the drive motor to be positioned forward of the swing arm while still transmitting power to the rear wheel, resolving the contradiction between layout freedom and direct drive simplicity.
2Area of stationary object
If the drive motor is positioned forward of the swing arm with endless power transmission, then layout freedom is improved, but the power transmission structure becomes more complex
Solution Approach 1:
The power transmission system utilizes the lateral dimension by routing the endless power transmission member through the swing arm area laterally, allowing the drive motor to be positioned forward while efficiently utilizing available space without excessive complexity.
3Ease of operation
If the drive motor is directly connected to the rear wheel, then the power transmission path is short, but the motor position is constrained by the swing arm location
Solution Approach 1:
The endless power transmission member serves as a mediator that decouples the drive motor from direct connection to the rear wheel, enabling the motor to be positioned forward of the swing arm while maintaining functional connection through the power transmission chain.
4Stability of the object's composition
If the drive motor is positioned forward of the swing arm, then mass can be concentrated around the center of gravity, but the power transmission requires an endless transmission member
Solution Approach 1:
The endless power transmission member acts as a flexible intermediary that allows the drive motor to be positioned forward of the swing arm near the vehicle's center of gravity, improving stability while accepting the added complexity of the chain transmission system.
Data Source
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AI summary
A vehicle includes upper frames, lower frames, a front frame, a rear frame, a pair of rear wheels, a drive motor to drive the pair of rear wheels, a battery to supply electric power to the drive motor, an endless power transmission to connect the drive motor with the pair of rear wheels, a pivot shaft attached to the rear frame, a swing arm supported pivotably by the pivot shaft and supporting the pair of rear wheels, a straddled seat at a higher position than the drive motor, and a bar handle provided at a higher position than the straddled seat. The drive motor is located farther forward than the swing arm.