Electromagnetic Tooth-Clutch for Vehicle Electric Drive Acceleration
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Solution Overview
Problem
Current electrically driven automobiles, particularly front-driven or rear-driven new energy vehicles, experience insufficient startup acceleration and delayed startup and stop response times due to inadequate dynamic characteristics of electric motors and the limitations of traditional speed reducers, which cannot utilize conventional friction clutches effectively.
Innovation Solution
A vehicle electrically driving assembly comprising an electric motor, a speed reducer with multiple stages of gears, and an electromagnetic tooth-mounted clutch connected to the vehicle axle half shafts, allowing for auxiliary driving force provision through the clutch, mimicking four-wheel drive functionality and enabling instant power release to improve acceleration and reduce energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional friction clutches are used in speed reducers, then clutching function and cushioning function are provided, but they cannot withstand the large shock on the rotor shaft of electric motor
Solution Approach 1:
The patent replaces the conventional friction clutch with an electromagnetic clutch that uses electromagnetic fields instead of mechanical friction to achieve clutching and cushioning functions. This substitution allows the system to withstand large shocks from electric motor startup without the limitations of friction-based mechanisms, directly resolving the contradiction between providing clutching function and withstanding rotor shaft shock.
2Device complexity
If hard connection mode is adopted in speed reducers, then structural simplicity is maintained, but clutching function, cushioning function and self-aligning function are lost
Solution Approach 1:
The patent introduces a dynamically controllable electromagnetic clutch that can switch between engaged and disengaged states, providing adaptability for clutching, cushioning, and self-aligning functions. The electromagnetic clutch's ability to dynamically adjust its state allows the speed reducer to maintain structural simplicity while gaining versatile functional capabilities, resolving the contradiction between structural simplicity and functional adaptability.
3Device complexity
If startup and stop rely only on electric motor, then system simplicity is maintained, but startup and stop response time is delayed
Solution Approach 1:
The patent introduces an electromagnetic clutch as an intermediary component between the electric motor and the drive system. This intermediary enables faster startup and stop response by allowing the motor to engage and disengage power transmission independently of the drive train, significantly reducing response time while maintaining relatively simple power system structure.
4Productivity
If electromagnetic tooth-mounted clutch is engaged, then auxiliary driving force is provided improving acceleration, but kinetic energy loss occurs during engagement/disengagement
Solution Approach 1:
The patent uses an electromagnetic clutch that employs electromagnetic fields rather than mechanical friction for engagement and disengagement. This substitution minimizes kinetic energy loss during switching operations while still providing the auxiliary driving force needed to improve startup acceleration performance, resolving the contradiction between acceleration enhancement and energy conservation.
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 solution enhances startup acceleration performance, reduces kinetic energy loss, and addresses the limitations of traditional friction clutches by providing instant power engagement and disengagement, thus overcoming the insufficient acceleration and delayed response issues in new energy vehicles.
Implementation Method 1
an electromagnetic tooth-mounted clutch comprising: a fixed face tooth, a movable face tooth, a solenoid assembly and a return elastic assembly
Implementation Method 2
the return elastic assembly is a spring, an elastic sheet, a diaphragm spring or a spring assembly
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention discloses a vehicle electrically driving assembly, connected to the rear axle half shaft or the front axle half shaft of the vehicle. The vehicle electrically driving assembly comprises: an electric motor, a speed reducer, an electromagnetic tooth-mounted clutch and a differential. The speed reducer is provided with multiple stages of gears, an input shaft and an intermediate shaft; the differential is connected between the vehicle axle half shafts; the electromagnetic tooth-mounted clutch is installed on the input shaft or the intermediate shaft of the speed reducer or on the vehicle axle half shafts. When the electromagnetic tooth-mounted clutch is in engagement, the driving force of the electric motor is transmitted to the vehicle axle via the speed reducer and the electromagnetic jaw clutch, to provide an auxiliary driving force to the vehicle. When the power of the entire vehicle is insufficient at the acceleration phase, the electrically driving assembly, by using the electromagnetic jaw clutch, provides an auxiliary driving force to the entire vehicle, which overcomes the defect of the insufficient acceleration performance of new energy vehicles. When the entire vehicle completes the acceleration, the power of the electrically driving assembly can be instantly released from the entire vehicle by separating the electromagnetic jaw clutch, to save energy.