Vehicle Closure Drivetrain With Radial Friction Coupling
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Solution Overview
Problem
Existing drivetrains for motorized closure elements in vehicles require significant structural space due to axial friction engagement mechanisms, which increases the technical length and complexity.
Innovation Solution
Implementing a radial friction engagement mechanism using a tolerance ring and multiple friction engagement elements, eliminating the need for axial pressing mechanisms, thereby reducing the structural length and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an axial friction engagement mechanism is used, then the drivetrain can transmit torque, but the technical length and structural space increase
Solution Approach 1:
The invention changes the friction engagement from axial direction to radial direction. The friction elements engage radially between the drive shaft and the driven component, eliminating the need for axial pressing mechanisms and reducing the technical length of the drivetrain while maintaining torque transmission capability
2Power
If a pressing mechanism is used to produce friction torque, then torque transmission is achieved, but the axial structural space increases
Solution Approach 1:
The invention extracts and eliminates the pressing mechanism from the drivetrain by using radial friction engagement. The friction torque is generated through radial clamping forces between friction elements, removing the need for separate axial pressing components and reducing structural space
3Power
If a tolerance ring with radial clamping force is used, then the radial friction engagement is achieved, but manufacturing complexity increases
Solution Approach 1:
The tolerance ring incorporates radial protrusions that change the geometric parameters of the ring, enabling it to generate radial clamping forces when subjected to axial loads. This parameter change allows the ring to function as both a positioning element and a force transmission element, achieving radial friction engagement
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 radial friction engagement mechanism reduces the drivetrain's length and complexity while maintaining operational reliability and allowing manual displacement of closure elements.
Implementation Method 1
a tolerance ring provides a defined resilient force in a radial direction
Implementation Method 2
a radial friction engagement between the friction engagement elements of a friction engagement mechanism
Data Source
AI summary
A drivetrain for the motorized movement of a motor vehicle closure including at least one friction lock mechanism to provide a friction torque, the friction lock mechanism being part of a coupling mechanism of the drivetrain for coupling two drive components of the drivetrain for conjoint rotation, including a coupling piece on the motor side to a drive component on the motor side and via a coupling piece remote from the motor to a drive component remote from the motor, and including multiple friction lock elements which can be rotated about a drive axis, are situated coaxially to one another and form the friction lock mechanism, a middle one of the friction lock elements being concentric to one another and in frictional engagement with two others of the friction lock elements.