Electric Motorcycle Gearbox for Torque and Efficiency
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Solution Overview
Problem
Conventional electric motorcycles face challenges in meeting consumer needs due to limited endurance, high power consumption, and inefficient power transmission, particularly in varying driving conditions, and they also contribute to air pollution.
Innovation Solution
An electric motorcycle power transmission system utilizing a gearbox from a fuel engine-based vehicle, coupled with an electric motor, allows for selective gear shifts and optimal power output, reducing power consumption and enhancing endurance by using a motor controller, main drive shaft, belt gear, and clutch for efficient speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low horsepower motor is used in direct drive mode, then electricity consumption is reduced and control is easier, but start time is prolonged and battery power draw is excessive in the initial stage
Solution Approach 1:
The patent applies a variable transmission ratio system that dynamically adjusts gear ratios based on operating conditions. The transmission system can switch between different gear ratios (first gear ratio for starting, second gear ratio for cruising) to optimize both starting performance and energy consumption during different phases of operation.
Solution Approach 2:
The patent segments the operating range into different phases (starting phase and cruising phase) with different transmission ratios. The transmission system is divided into multiple gear stages, allowing the vehicle to use appropriate gear ratios for different speed and load conditions, thereby resolving the contradiction between starting performance and energy efficiency.
2Speed
If the horsepower of the motor is increased to improve starting performance, then start time is reduced, but electricity consumption increases and red burst risk increases
Solution Approach 1:
The transmission system dynamically selects appropriate gear ratios based on real-time operating conditions. During starting, a lower gear ratio provides torque multiplication for quick acceleration. During cruising, a higher gear ratio reduces motor speed and power consumption, thereby resolving the contradiction between starting performance and energy efficiency.
Solution Approach 2:
The transmission system acts as an intermediary between the motor and the wheels, providing torque multiplication during starting through lower gear ratios, and speed reduction during cruising through higher gear ratios. This mediator allows the motor to operate efficiently across different operating conditions without requiring excessive horsepower.
3Speed
If a reduction gear drive with fixed gear ratio is used, then starting performance is improved, but high-speed and low-speed driving needs cannot be met simultaneously
Solution Approach 1:
The transmission system is segmented into multiple gear stages with different transmission ratios. Each gear stage is optimized for specific operating conditions (starting, acceleration, cruising). The system can switch between these segments to meet different driving needs, thereby resolving the contradiction between starting performance and adaptability to various driving conditions.
Solution Approach 2:
The transmission system dynamically adjusts the transmission ratio based on operating conditions. The control system monitors vehicle speed, load, and other parameters to select the appropriate gear ratio, enabling the vehicle to maintain optimal performance across a wide range of driving conditions including both high-speed and low-speed operations.
4Reliability
If the V-grooved turntables clamp the transmission belt positively to prevent sliding, then belt stability is improved, but frictional heat increases and energy is lost
Solution Approach 1:
The patent replaces the friction-based belt drive system with a chain drive system. The chain drive uses positive engagement between chain links and sprocket teeth, eliminating the need for friction-based clamping. This substitution maintains reliable power transmission without the energy losses associated with frictional heat, thereby resolving the contradiction between belt stability and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables optimal output efficiency and reduced power consumption by providing different torque outputs in various conditions, enhancing the electric motorcycle's endurance and eliminating the need for pollutant-emitting components, thereby reducing costs and environmental impact.
Implementation Method 1
one end thereof fixedly mounted with a belt gear and coupled to the electric motor through a transmission belt
Implementation Method 2
a gear set, a clutch coupled between the power input gear and the speed change gear set
Data Source
AI summary
An electric motorcycle includes an electric motor, a motor controller for controlling the operation of the electric motor, a gearbox that can be of a used or new fuel engine-based vehicle and rotatable by the electric motor, and a main drive shaft coupled between the electric motor and the gearbox. Subject to the optimal power transmission performance of the gearbox, the electric motor is capable of producing the most appropriate driving speed in the starting state or any of a variety of travelling states, achieving optimal output efficiency and significantly reducing power consumption and enhancing endurance.