Electric Motor Positioning for Weight Balance and Brake Access
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Solution Overview
Problem
The existing electric saddle-ridden vehicles have a poor weight balance due to the offset placement of the heavy electric motor, making it difficult to access the rear wheel tire for maintenance without removing other components.
Innovation Solution
The electric motor is positioned closer to the vehicle body centerline, with the reduction gear on the opposite side, and the drum brake accessible from the opposite side, allowing for easier maintenance without removing the motor or gear, and the wheel hub is offset to balance the weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electric motor is disposed offset to one side in the vehicle width direction, then the rear wheel and its components are easily accessible for maintenance, but the weight balance of the vehicle deteriorates
Solution Approach 1:
The patent positions the electric motor in the vehicle width direction (lateral dimension) rather than only in the longitudinal direction, placing it laterally between the left and right rear wheels. This dimensional change allows the motor to be horizontally accessible for maintenance while its lateral positioning contributes to balancing the vehicle's weight distribution across the width, resolving the contradiction between maintenance accessibility and weight balance.
2Ease of repair
If the drum brake is accessed from the reduction gear side, then the maintenance procedure becomes complex requiring removal of motor and gear, but the structural arrangement is simplified
Solution Approach 1:
The patent segments the braking system by providing a separate access path for the drum brake that is independent of the power transmission components (motor and reduction gear). The drum brake is positioned such that it can be accessed from the vehicle rear side through the swing arm structure, allowing brake maintenance to be performed separately without disturbing the motor or gear assembly, thus simplifying the maintenance procedure while maintaining structural integrity.
Data Source
AI summary
In an electric saddle-ridden vehicle including a swing arm, a power unit supported on an arm portion of the swing arm while having an electric motor and a reduction gear reducing in speed an output of the electric motor and transmitting it to a wheel side of the rear wheel, and a wheel brake provided on the wheel, the power unit is arranged so that the reduction gear is disposed to one side in the vehicle width direction with the rear wheel on the opposite side with respect to the electric motor and the electric motor is disposed closer to a vehicle body center line than the reduction gear in the vehicle width direction, and the wheel brake is provided on the wheel so as to be capable of being accessed from the other side in the vehicle width direction, which is the side opposite to the power unit.