Electric Vehicle Transmission with Unidirectional Flywheel for Reduced Coasting Resistance
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Solution Overview
Problem
Conventional drive trains in electric vehicles lack a unidirectional transmission mechanism, resulting in high coasting resistance and short coasting distance when the vehicle is not powered, which is impractical for electric scooters and other transportation tools.
Innovation Solution
A transmission system comprising a gear transmission mechanism and a pulley transmission mechanism with a unidirectional flywheel or bearing, connected to the rear wheel, allowing the vehicle to coast smoothly with reduced power consumption and increased endurance mileage by utilizing inertia and low rotation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drive train without unidirectional transmission is used, then the structure is simple, but the coasting resistance is large and coasting distance is short
Solution Approach 1:
The transmission system is divided into two independent parts: a gear transmission mechanism for powered motion and a pulley transmission mechanism with unidirectional flywheel for coasting motion. This segmentation allows each mechanism to operate independently, enabling smooth transitions between powered and coasting states while reducing overall system complexity.
Solution Approach 2:
The unidirectional flywheel mechanism dynamically engages and disengages based on the vehicle's operational state. During coasting, the flywheel rotates freely with minimal resistance; during powered motion, the gear mechanism engages. This dynamic behavior optimizes coasting distance while maintaining simple structural design.
2Use of energy by moving object
If the driving device and transmission mechanisms continue to rotate during coasting, then the structure remains simple, but energy consumption increases and endurance mileage decreases
Solution Approach 1:
The unidirectional flywheel mechanism extracts and isolates the coasting function from the main drive train. During coasting, only the flywheel rotates while the driving device and gear mechanisms remain stationary, eliminating unnecessary energy consumption and reducing friction losses in the primary transmission components.
Solution Approach 2:
The unidirectional flywheel automatically engages during coasting without requiring external control or additional energy input. The mechanism self-regulates based on the direction of force applied, allowing the vehicle to coast efficiently while the driving device remains idle and consumes no energy.
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 transmission system enables efficient power output, reduces power consumption, and enhances endurance mileage by allowing the vehicle to coast smoothly without the driving device, gear, or pulley transmission mechanisms rotating, thus improving practicality and energy efficiency.
Implementation Method 1
a unidirectional transmission mechanism connected to the driven wheel, the unidirectional transmission mechanism being used for driving the rear wheel to rotate
Implementation Method 2
both of the drive train and power unit will rotate during the coasting, thereby resulting in large coasting resistance
Implementation Method 3
the pulley transmission mechanism comprising a driving wheel, a driven wheel and a synchronous belt
Data Source
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AI summary
The present invention relates to the technical field of mechanical apparatus, particularly to a transmission and an electric vehicle provided with the transmission. The present invention provides a transmission with an input end connected with a driving device, an output end connected with a rear wheel, the transmission comprising a gear transmission mechanism and a pulley transmission mechanism, the gear transmission mechanism comprising a primary gear connected to the driving mechanism; the pulley transmission mechanism comprising a driving wheel, a driven wheel and a synchronous belt; the driving wheel being connected with the primary gear through a gear shaft, a unidirectional transmission mechanism connected to the driven wheel being provided in the rear wheel, the unidirectional transmission mechanism being used for driving the rear wheel to rotate. The transmission provides power output by the driving device, transmits the power to the pulley transmission mechanism by the gear transmission mechanism, and the pulley transmission mechanism drives the rear wheel to rotate through the unidirectional transmission mechanism, such that the vehicle moves forward; when the power output is stopped, due to the inertia of the vehicle and the small rotation resistance of the unidirectional transmission mechanism, the vehicle can smoothly coast, thereby achieving the advantageous effects of saving power consumption and improving endurance mileage.