Electric Motorcycle Frame Layout for Compact Off-Road Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The arrangement and location of the battery, electric motor, and electronic control unit on electric motorcycles affect their off-road performance, particularly for youth-oriented models, necessitating a compact and efficient design to enhance performance.
Innovation Solution
The electric motorcycle features a frame configuration with a main frame, underframe, and suspension system that positions the battery, electric motor, and electronic control unit within a receiving space, ensuring a combined width ratio of 0.55 to 0.75 and a frame width ratio of 0.08 to 0.15, along with a long wheelbase and specific motor alignment to optimize stability and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery, electric motor and electronic control unit are arranged within a compact receiving space, then the structure becomes compact and suitable for youth riders, but the off-road performance may be compromised
Solution Approach 1:
The patent positions the electric motor and electronic control unit in a transverse alignment within the receiving space, utilizing the longitudinal dimension of the frame structure. This spatial arrangement optimizes the compactness of the vehicle while maintaining sufficient space for off-road components, resolving the contradiction between compact structure and off-road performance.
Solution Approach 2:
The patent applies different width ratios to different sections of the frame: the main frame has a width ratio of 0.08-0.15 while the underframe provides additional width support. This localized quality enhancement ensures compactness in the receiving space while maintaining overall structural stability for off-road conditions.
2Reliability
If the combined width of electric motor and electronic control unit is increased to 0.55-0.75 of maximum frame width, then the components are properly positioned for off-road performance, but the overall vehicle width increases
Solution Approach 1:
The patent employs a detachable side strap for the battery support system, allowing the vehicle width to be dynamically adjusted. The side strap can be detached to reduce vehicle width for urban environments or attached to provide maximum width for off-road conditions, resolving the contradiction between component positioning and overall vehicle dimensions.
Solution Approach 2:
The battery support system is divided into fixed portions and a detachable side strap, allowing independent adjustment of the battery position. This segmentation enables the electric motor and electronic control unit to be positioned optimally for off-road performance while allowing the overall vehicle width to be reduced when needed.
3Volume of moving object
If the frame width ratio is reduced to 0.08-0.15, then the vehicle becomes more compact, but the stability and obstacle avoidance capability may be reduced
Solution Approach 1:
The patent uses a composite frame structure combining the main frame with an underframe that has greater width. This composite approach allows the overall vehicle to maintain compactness (main frame width ratio of 0.08-0.15) while the underframe provides additional stability and obstacle avoidance capability, resolving the contradiction between compactness and stability.
Solution Approach 2:
The underframe acts as a counterweight structure that compensates for the reduced width of the main frame. By positioning the battery and other components within the receiving space defined by the main frame and underframe, the system maintains stability despite the compact dimensions.
Data Source
AI summary
An electric motorcycle has a battery, an electric motor and an electronic control unit positioned in a receiving space between a main frame and an underframe. The electronic control unit is transversely in line with at least part of the electric motor. A combined width of the electric motor and electronic control unit divided by the maximum frame width is within 0.55-0.75. The maximum main frame width divided by the wheelbase is within 0.08-0.15. The vehicle cover has left and right front half cowls on left and right sides of the head tube, with air cutting outside edges disposed wider than the front shock absorbers and wider than the maximum width of the frame. The battery support system has fixed portions which limit battery movement in five directions and a detachable side strap which limits battery movement in the other sideways direction.