Electric Motorcycle Battery Case Integrated Frame Structure
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Solution Overview
Problem
Conventional electric motorcycles with small motors require large and heavy batteries for increased power, leading to a significant increase in vehicle size when using traditional battery attachment structures.
Innovation Solution
The integration of a battery case that doubles as a structural component of the motorcycle's frame, with connecting portions to the body frame, allowing the battery case to form part of the frame portion, thereby reducing overall vehicle size and improving weight balance and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a large and heavy battery is mounted to increase traveling power, then the traveling power and duration are improved, but the vehicle body size increases significantly
Solution Approach 1:
The battery case is merged with the frame portion to form an integrated structure. The battery case serves dual functions: accommodating the battery and forming part of the motorcycle frame. This integration eliminates the need for separate battery mounting brackets and reduces overall vehicle size while accommodating larger batteries.
Solution Approach 2:
The battery case is designed with multi-functionality, serving as both a battery container and a structural frame component. It includes connecting portions that integrate it into the motorcycle's overall structure, allowing it to perform multiple functions simultaneously and reducing the need for additional components.
2Power
If a large and heavy battery is mounted to increase traveling power, then the traveling power is improved, but the weight balance and steering operability are affected
Solution Approach 1:
The battery case is positioned asymmetrically in the vehicle structure, with its center arranged on the front side of an intermediate position between the front and rear wheel centers. This asymmetric positioning allows the heavy battery to be placed in a location that maintains front-wheel dominance for steering responsiveness while still providing the necessary power.
Solution Approach 2:
The battery case is arranged to overlap with a line connecting the head pipe and rear wheel grounding point in a side view, positioning it along the roll axis. This spatial arrangement in a different dimension allows the battery to be integrated without compromising steering geometry or operational characteristics.
3Ease of manufacture
If a conventional battery attachment structure is used, then the battery can be easily installed, but the vehicle body size increases highly
Solution Approach 1:
The battery case is merged with the frame portion to form an integrated structure. The battery case serves dual functions: accommodating the battery and forming part of the motorcycle frame. This integration eliminates the need for separate battery mounting brackets and reduces overall vehicle size while accommodating larger batteries.
Data Source
AI summary
An electric motorcycle according to the present invention includes an electric motor generating traveling power to be transmitted to a driving wheel, a battery supplying electric power to the electric motor, a battery case accommodating the battery, and a body frame having a head pipe supporting a steering shaft, and a frame portion extending substantially rearward from the head pipe. The battery case has a first connecting portion to be coupled to a first member forming the body frame, and a second connecting portion arranged away from the first connecting portion in the up and down direction or the forward and rearward direction and coupled to a second member forming the body frame, so as to form a part of the frame portion.