Saddle-Type Electric Vehicle Gravity Center Alignment
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Solution Overview
Problem
Saddle-type electric vehicles face challenges in balancing handling and motion performance due to the high center of gravity caused by the placement of heavy electric motors and storage devices, which affects cornering stability and ease of handling.
Innovation Solution
The electric motor is positioned low in the vehicle, with the electric storage devices installed diagonally forward, and a power transmission mechanism is used to align the gravity centers with the roll axis line, improving balance and reducing the overall height of the power plant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric storage device is installed above the electric motor to supply large current, then the power output is improved, but the center of gravity position becomes too high and handling becomes difficult
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (storage device above motor) to a diagonal forward arrangement. The storage device is positioned diagonally forward from above the power plant, changing the spatial dimension of component layout. This dimensional change allows the heavy components to be distributed in a way that approximates the roll axis line, improving handling while maintaining power output capability.
Solution Approach 2:
The patent employs asymmetric positioning of the electric storage device relative to the power plant. Instead of symmetric vertical placement, the storage device is positioned diagonally forward, creating an asymmetric weight distribution that aligns with the vehicle's roll axis line. This asymmetric arrangement optimizes the center of gravity position for both handling and motion performance.
2Power
If the electric storage device is positioned high above the motor, then power supply capability is improved, but the composite gravity center becomes too high affecting cornering stability
Solution Approach 1:
The patent changes the spatial arrangement from vertical stacking to diagonal forward positioning. The storage device is located diagonally forward from above the power plant, which redistributes the weight along the roll axis line. This dimensional change maintains power supply capability while improving cornering stability by optimizing the center of gravity position.
Solution Approach 2:
The patent applies local quality optimization by specifically positioning the heavy storage device and power plant components along the roll axis line. This localized weight distribution strategy ensures that the heavy components are positioned where they most effectively influence both power supply and cornering stability, rather than uniformly distributing weight throughout the vehicle.
3Ease of operation
If heavy components are positioned to approximate the roll axis line, then handling and motion performance balance is improved, but the layout complexity increases
Solution Approach 1:
The patent simplifies the layout by using a consistent diagonal forward positioning strategy for both the power plant and storage device. This unified dimensional approach, where components are arranged diagonally forward from the vehicle center, naturally approximates the roll axis line without requiring complex calculations or adjustments, thereby reducing layout complexity while maintaining performance balance.
Data Source
AI summary
In a saddle-type electric vehicle like an electric two-wheeled vehicle, a shaft center of a motor shaft of a traveling motor in a power plant installed between a front wheel and a rear wheel is installed lower than a shaft center of a rearward output shaft, and the whole power plant is installed as low as possible in a state where a front part is at a lower position. Batteries are installed diagonally forward from above the power plant, a gravity center of the batteries and a gravity center of the power plant are arranged to correspond to a roll axis line having the front part which is high. Thus, while the height of the gravity centers approximate the roll axis line of the vehicle body, a composite gravity center of the both is properly set, and balance of handling and motion performance can be improved.