Electric Motorcycle Battery and Suspension Layout
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Solution Overview
Problem
Electric vehicles face challenges in reducing size and weight while maintaining battery capacity and improving suspension comfort, as traditional suspension arrangements interfere with rider positioning and increase vehicle size and weight.
Innovation Solution
The electric vehicle design features a battery positioned between the head pipe and electric motor, deviated to one side, and a rear suspension tilted forward, overlapping with the battery in a side view, eliminating the need for a link mechanism and allowing progressive suspension characteristics without increasing the wheelbase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery volume is enlarged in the longitudinal direction to increase battery capacity, then the maximum power and traveling range are improved, but the wheel base increases resulting in increased vehicle size and weight
Solution Approach 1:
The patent transitions from longitudinal battery arrangement (affecting wheel base) to a lateral/diagonal arrangement where the battery is positioned between the head pipe and electric motor, deviated to one side. This dimensional change allows the battery to be arranged in the width direction and vertically overlapping with the suspension, thereby increasing battery capacity without extending the wheel base.
2Device complexity
If a traditional suspension arrangement is used, then the suspension structure is simple, but the suspension interferes with rider positioning and increases vehicle size and weight
Solution Approach 1:
The rear suspension is arranged to tilt forward and positioned inside the vehicle body frame, overlapping with the battery in side view. This spatial reconfiguration moves the suspension from a traditional lateral arrangement to a diagonal/vertical arrangement that does not interfere with rider positioning and reduces the vehicle's overall width.
3Reliability
If a link mechanism is used to interlock the suspension and swing arm, then the suspension structure is robust, but the vehicle weight and complexity increase
Solution Approach 1:
The patent eliminates the link mechanism that traditionally interlocks the suspension and swing arm. By removing this intermediate component, the design achieves weight reduction and simplified structure while maintaining suspension functionality through the direct arrangement of the suspension between the vehicle body frame and swing arm.
4Weight of moving object
If the suspension is arranged to be extendable in the longitudinal direction, then the vehicle weight and complexity are reduced, but progressive characteristics cannot be added to the suspension
Solution Approach 1:
The rear suspension is configured to tilt forward and extend obliquely upward from the swing arm, positioned inside the vehicle body frame. This diagonal/vertical arrangement in a different spatial dimension allows the suspension to be extendable (reducing weight and complexity) while simultaneously providing the geometric conditions for progressive characteristics through its inclined orientation.
Data Source
AI summary
An electric vehicle, such as an electric motorcycle, which includes a vehicle body; a vehicle body frame having a head pipe that holds a front wheel in a steerable manner; a swing arm holding a rear wheel in a swingable manner in a vertical direction of the vehicle body; an electric motor arranged to a substantially central portion between the front wheel and the rear wheel; a battery arranged in a space between the head pipe and the electric motor and inside the vehicle body frame in a manner deviated to either one of sides in a width direction of the vehicle body; and a rear suspension tilted forward and arranged inside the vehicle body frame and above the electric motor in a manner deviated to another one of the sides in the width direction of the vehicle body.