Straddled Electric Vehicle Motor Mounting for Seat Space
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Solution Overview
Problem
Existing straddled electric vehicles face limitations in increasing the capacity of batteries and storage cases due to spatial constraints between the electric motor and the seat.
Innovation Solution
The proposed straddled electric vehicle design includes a motor unit with an upper and lower mounting portion attached to the body frame, where the upper mounting portion is positioned forward of the electric motor's rotation center, and the lower mounting portion is positioned higher than the second rotation shaft, allowing for a lower motor unit position while maintaining minimum ground height, and incorporating a motor drive unit positioned behind the battery and in front of the motor unit to optimize space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor unit is positioned with the upper mounting portion above the rotation center, then the mounting structure is simplified, but the space between the seat and motor unit is reduced
Solution Approach 1:
The patent inverts the conventional mounting arrangement by positioning the upper mounting portion forward of the rotation center rather than above it. This inversion allows the motor unit to be positioned lower, increasing the vertical space between the motor unit and the seat while maintaining structural integrity through the body frame.
2Volume of moving object
If the lower mounting portion is positioned below the second rotation shaft, then the motor unit position is lowered, but the minimum ground height requirement cannot be met
Solution Approach 1:
The patent changes the positioning approach by moving the lower mounting portion forward of the second rotation shaft's rotation center rather than directly below it. This dimensional change in positioning allows the motor unit to be lowered vertically while the forward positioning of the mounting portion maintains the required ground clearance through the vehicle's geometry.
3Quantity of substance
If the battery capacity is increased, then the power supply capability is improved, but the spatial constraints between motor unit and seat are violated
Solution Approach 1:
The patent segments the powertrain components by separating the motor unit positioning from the battery positioning. The motor unit is positioned lower in the vehicle body with its upper mounting portion forward of the rotation center, creating additional vertical space that can be utilized for accommodating larger battery packs without interfering with the seat position.
4Quantity of substance
If the storage case capacity is increased, then the storage capability is improved, but the spatial constraints between motor unit and seat are violated
Solution Approach 1:
The patent segments the functional zones by positioning the motor unit lower and forward, creating distinct spatial zones. This segmentation allows the storage case to be positioned in the space between the seat and motor unit with increased capacity, while the motor unit's repositioned location prevents interference with the seat structure.
Data Source
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AI summary
To provide a straddled electric vehicle that allows more space between a seat and a motor unit, a motor unit 40 includes an upper mounting portion 46a and a lower mounting portion 46b that are attached to a body frame 20 and does not include a portion that is attached to the body frame rearward than the upper mounting portion 46a and the lower mounting portion 46b. The upper mounting portion 46a is located forward than a rotation center Cm of an electric motor 41. This structure can lower a position of the upper mounting portion 46a as compared with a structure in which the upper mounting portion 46a is located above the rotation center Cm of the electric motor 41.