Reverse Drive Transmission Unit With Actuated Bushing Coupling
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Solution Overview
Problem
Existing transmission units for motor vehicles, particularly two or three-wheeled vehicles, lack an efficient and cost-effective reverse drive mechanism, making it difficult to maneuver vehicles in reverse without complex and bulky systems.
Innovation Solution
A transmission unit with a reverse drive electric motor, a control bushing, a driven transmission bushing, and an actuator that controls the engagement and disengagement of reverse drive, allowing for efficient reverse motion without the need for a gear transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gear transmission system is used for reverse drive, then reverse drive functionality is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the reverse drive function from the main forward drive transmission system by using a separate electric motor dedicated solely to reverse motion. This separates the reverse drive mechanism from the complex gear transmission system, allowing reverse functionality to be added without increasing overall transmission complexity.
Solution Approach 2:
The electric motor serves multiple functions: it provides reverse drive torque directly to the driving wheel shaft, acts as a brake during reverse operation, and can be engaged or disengaged as needed. This multi-functional approach reduces the need for separate dedicated components for each function.
2Adaptability or versatility
If a cardan shaft and electric motor system is used for reverse drive, then reverse motion is enabled, but system complexity and safety issues arise
Solution Approach 1:
The patent eliminates the cardan shaft and complex mechanical connection system by directly coupling the electric motor to the driving wheel shaft. This direct connection removes unnecessary intermediate components and simplifies the mechanical architecture while maintaining reverse motion capability.
Solution Approach 2:
The patent introduces a simplified intermediary mechanism consisting of a one-way clutch and braking element that mediates between the electric motor and the driving wheel shaft. This intermediary system provides the necessary control and safety functions without requiring complex cardan shaft connections.
3Adaptability or versatility
If an auxiliary electric motor with reduction gear is used, then reverse drive is achieved, but the system becomes bulky and poorly functional
Solution Approach 1:
The patent removes the reduction gear from the auxiliary electric motor system by directly coupling the motor to the driving wheel shaft. This extraction of the reduction gear significantly reduces the volume of the reverse drive unit while maintaining adequate torque through direct motor-shaft connection.
Solution Approach 2:
The patent replaces the mechanical reduction gear system with an electrically controlled braking and one-way clutch mechanism. This substitution eliminates bulky mechanical reduction components while achieving the same functional effect through electromagnetic and friction-based control.
4Device complexity
If manual pushing is used for reverse movement, then no additional mechanism is needed, but maneuverability becomes difficult and awkward
Solution Approach 1:
The electric motor provides self-powered reverse motion, eliminating the need for manual pushing. The system serves itself by using the electric motor to generate the force required for reverse movement, making the vehicle capable of self-maneuvering in reverse without external assistance.
Solution Approach 2:
The patent changes the operational parameter from manual force application to electric motor-driven force generation. This parameter change transforms the reverse maneuvering capability from dependent on human physical effort to dependent on controlled electric motor output, significantly improving ease of operation.
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 enables easy and efficient reverse maneuvering of motor vehicles, reducing complexity and cost compared to existing systems, while maintaining safety through a centrifugal safety system.
Implementation Method 1
an actuation element that can comprise an anchor, movable by effect of the electromagnetic force generated by the magnet
Implementation Method 2
the safety system comprises at least one centrifugal mass, and preferably a pair of centrifugal masses, rotating with the shaft of the driving wheel and movable radially with respect thereto, as a result of the centrifugal force
Data Source
AI summary
The transmission unit (15) for motor vehicle (1) comprises a shaft (23) of the driving wheel, operatively connected to a main drive (19, 97) to control forward drive, and a reverse drive electric motor (21). The transmission unit further comprises a control bushing (47) rotated by the reverse drive electric motor (21), and a driven transmission bushing (63), operatively connected to the shaft (23) of the driving wheel. An actuator (121) is provided for controlling mutual coupling between the control bushing (47) and the driven transmission bushing (63) to transmit the motion of the reverse drive electric motor (21) to the shaft (23) of the driving wheel.