Electric Motorcycle Frame Layout for Easier Battery Removal
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Solution Overview
Problem
The existing electric vehicle design, as seen in JP 2004-358982 A, has symmetrically arranged left and right frames supporting the battery, which simplifies the structure but may not be optimal for battery detachment and capacity considerations.
Innovation Solution
The electric vehicle incorporates asymmetrical right and left frame portions extending in the front-back direction, allowing for easier battery detachment and increased capacity by adjusting the height of one frame portion and bending the other outward, thereby optimizing battery placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If symmetrical frame arrangement is used, then vehicle body structure is simpler and manufacture is easier, but battery detachment becomes more difficult and battery capacity is reduced
Solution Approach 1:
The patent applies asymmetry by making the right frame portion extend farther laterally than the left frame portion. This asymmetric configuration allows the battery to be positioned with its right side extending beyond the right frame portion, facilitating easier detachment of the battery from the vehicle body while maintaining structural integrity and manufacturing feasibility.
2Device complexity
If symmetrical frame arrangement is used, then vehicle body structure is simpler, but battery capacity is reduced
Solution Approach 1:
The asymmetric frame design, specifically the right frame portion extending farther laterally, creates additional space that accommodates a larger battery capacity. The battery is configured with its right side extending beyond the right frame portion, maximizing the use of available space without significantly increasing overall structural complexity.
Solution Approach 2:
The patent utilizes the lateral dimension by extending the right frame portion farther than the left, creating asymmetric three-dimensional space that accommodates a larger battery. This dimensional approach allows increased battery capacity without proportionally increasing the vehicle's overall size or structural complexity.
3Quantity of substance
If frame portion is bent outward to increase battery capacity, then battery capacity increases, but vehicle structure becomes more complex
Solution Approach 1:
The patent implements a moderate asymmetric configuration where only the right frame portion extends farther laterally compared to the left frame portion. This selective asymmetry provides sufficient space for increased battery capacity while avoiding excessive structural complexity that would result from more aggressive asymmetric designs or bending the frame outward significantly.
Data Source
AI summary
An electric vehicle that can realize a more desirable structure in view of detachment of a battery and battery capacity is provided. An electric motorcycle has a footboard, a right frame front portion and a left frame front portion placed on the footboard, and a battery supported by frame front portions. The left and right frame front portions are asymmetrical about a vertical plane passing through a center of a vehicle body in a left-right direction.