Freewheel Flap Drivetrain for Manual Motor Vehicle Actuation
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Solution Overview
Problem
Existing flap arrangements for motor vehicles require complex assemblies for manual operation and often restrict the force and speed of movement, making it difficult to easily open and close flaps like tailgates and liftgates, especially in smaller vehicles.
Innovation Solution
A freewheel mechanism is integrated into the drivetrain, allowing the flap to be actuated by both motor and hand, with a drive component and a driven component that interact to transmit driving forces, enabling the flap to be moved manually without displacing the drive component, and allowing for full pivot angle movement without engaging the drive component during manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor-driven drivetrain is used to actuate the flap, then motorized movement is achieved, but manual operation becomes restricted due to engagement of drive components
Solution Approach 1:
The drivetrain is designed with dynamic engagement characteristics where the drive component and driven component only engage during motorized actuation. During manual operation, the components remain disengaged, allowing free movement. This dynamic behavior enables the system to adapt its mechanical coupling state based on the actuation mode, resolving the contradiction between motorized automation and manual operability.
2Ease of operation
If a freewheel mechanism is added to allow manual operation, then ease of manual movement is improved, but device complexity increases
Solution Approach 1:
The drive component and driven component are designed to serve dual functions: during motorized actuation, they engage to transmit driving forces; during manual operation, they disengage to allow free movement. This multi-functionality eliminates the need for separate freewheel mechanisms or clutch devices, achieving manual operability without increasing overall device complexity.
3Power
If the transmitting element is always engaged with the receiving element, then motor force transmission is efficient, but manual movement is restricted
Solution Approach 1:
The engagement between transmitting element and receiving element is designed to be dynamic rather than static. The elements engage during motorized actuation to ensure efficient power transmission, and disengage during manual operation to allow unrestricted movement. This dynamic engagement state resolves the contradiction between maintaining motor force transmission efficiency and enabling easy manual movement.
4Adaptability or versatility
If the drivetrain allows full pivot angle movement manually, then complete range of motion is achieved, but the drive component may interfere with manual operation
Solution Approach 1:
The drive component and driven component are designed with inherent disengagement characteristics that allow them to separate during manual operation across the full pivot angle range. This design eliminates the need for additional disengagement mechanisms or limits on movement range, enabling complete adaptability for manual operation without increasing device complexity.
Data Source
AI summary
A drive arrangement for adjusting a flap of a motor vehicle about a body including a motor, a drivetrain, and a freewheel mechanism. The drivetrain is disposed between the motor and the flap. The freewheel mechanism provided with a drive component including a transmitting element, and a driven component provided with a receiving element coupled to the transmitting element. During motoric movement of the flap between the closed and the open position over at least a portion of the pivot angle, the motor actuates the drive component and displaces the transmitting element, from a neutral position, conjointly with the receiving element along a displacement path.