Electric Power Unit Torsion Damper for Instant Torque Launch
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Solution Overview
Problem
Electric vehicles with electric motors lack the play in the power transmission mechanism, resulting in a rigid operating feel for riders, making it difficult to apply instantaneous force during starting or accelerating, and require a clutch and energy-storing rotor, increasing the size of the electric power unit.
Innovation Solution
Incorporating a damper in the power transmission mechanism of the electric power unit, which allows for play and energy storage, enabling instantaneous force output without the need for an energy-storing rotor or clutch, and utilizing a control unit to optimize torque fluctuations for resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clutch and energy-storing rotor are added to improve instantaneous force output and operating feel, then the operating feel and instantaneous force are improved, but the size of the electric power unit increases
Solution Approach 1:
The patent combines the energy storage function and the clutch function into a single integrated mechanism. The spring element serves both to store energy during engine operation and to engage/disengage power transmission, eliminating the need for separate clutch and energy-storing rotor components while achieving the desired instantaneous force output and improved operating feel
Solution Approach 2:
The spring-based mechanism performs multiple functions simultaneously: it acts as an energy storage device, a clutch mechanism, and a vibration dampener. This multi-functional design reduces the overall component count and size of the electric power unit while maintaining the ability to provide instantaneous force and improve rider operating experience
2Force
If a clutch and energy-storing rotor are added to store and transmit energy instantaneously, then large instantaneous force can be applied to the drive wheel, but the device complexity increases
Solution Approach 1:
The patent merges the energy storage function and the clutch function into a single integrated mechanism. The spring element serves both to store energy during engine operation and to engage/disengage power transmission, eliminating the need for separate clutch and energy-storing rotor components while achieving the desired instantaneous force output and improved operating feel
Solution Approach 2:
The patent extracts and eliminates unnecessary components (separate clutch and energy-storing rotor) by using a spring-based mechanism that inherently provides both energy storage and engagement/disengagement functions, thereby reducing device complexity while maintaining instantaneous force capability
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
This solution improves the operating feel for riders by allowing instantaneous force output during starting and accelerating, reduces the size of the electric power unit, and enhances the degree of freedom in damper installation, making the electric power unit more compact and efficient.
Implementation Method 1
a spring that is interposed between the first rotor and the second rotor and transmits a torque of the first rotor to the second rotor
Implementation Method 2
since the damper produces play in the first power transmission mechanism, the rider is less likely to feel rigid operating feel
Implementation Method 3
part of the energy output by the electric motor is temporarily stored in the damper and then released toward the output shaft
Data Source
AI summary
An electric power unit includes: an electric motor; a motor shaft disposed in the electric motor; an output shaft that outputs power of the electric power unit; a power transmission mechanism that is connected to the motor shaft and the output shaft and transmits power of the motor shaft to the output shaft; and a torsion damper disposed in the power transmission mechanism.