Straddle Electric Vehicle Motor Layout for Compact Design
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Solution Overview
Problem
Straddle electric vehicles face challenges in compact layout design due to limited space, making it difficult to optimize the arrangement of on-vehicle parts.
Innovation Solution
The vehicle incorporates a motor case that accommodates an electric motor and output shaft, with the motor driving shaft located in front of and under the output shaft, allowing for a compact layout by aligning the motor and output shaft in an inclined direction, and utilizing a pivot frame with curved shape to maximize space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor and output shaft are arranged in a conventional layout, then the driving force transmission is straightforward, but the vehicle size increases and compact layout becomes difficult
Solution Approach 1:
The motor driving shaft is positioned in front of and under the output shaft, creating a three-dimensional arrangement that utilizes vertical and longitudinal space more efficiently. This dimensional reorganization allows the motor case to be compact while maintaining the driving force transmission path, thereby reducing overall vehicle size without complicating the layout.
Solution Approach 2:
The motor case is designed to accommodate both the electric motor and the output shaft within a single integrated housing. The motor driving shaft is positioned to extend from the motor while the output shaft is located behind it, creating a nested arrangement where components share space efficiently, thus reducing the volume required for the motor assembly.
2Ease of manufacture
If the motor case is made larger to accommodate components comfortably, then component installation is easier, but the vehicle dimensions increase
Solution Approach 1:
The motor case integrates the accommodation of the electric motor, output shaft, and motor driving shaft into a single unified structure. This merging of functions into one component eliminates the need for separate housings or mounting structures, thereby simplifying installation while maintaining a compact overall dimension that does not increase vehicle length.
3Quantity of substance
If the battery arrangement space is increased, then battery capacity can be enhanced, but the vehicle size increases
Solution Approach 1:
By positioning the motor driving shaft in front of and under the output shaft, the motor assembly occupies a compact three-dimensional space that does not extend significantly in the longitudinal direction. This creates available space in the vehicle floor area and vertical profile, allowing battery arrangement space to be increased without proportionally increasing overall vehicle size.
Data Source
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AI summary
A straddle electric vehicle includes: a vehicle body frame; an electric motor including a motor driving shaft that outputs driving force by which a rear wheel is driven; a speed reducer that reduces the speed of the driving force of the motor driving shaft; an output shaft to which the driving force is transmitted from the speed reducer; an endless loop through which the driving force is transmitted from the output shaft to the rear wheel; and a motor case accommodating the electric motor and the output shaft. The motor driving shaft is located in front of and under the output shaft.