Motor Vehicle Drive Unit Rolling Interface for Lower Friction
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Solution Overview
Problem
Existing drive units for motor vehicle applications, particularly in motor vehicle closing devices, face challenges with high friction levels due to sliding friction between the drive element and the actuation lever, which affects efficiency and torque transmission.
Innovation Solution
The introduction of a friction-reducing rolling element as an intermediate element between the drive element and the actuation lever, which facilitates a rolling movement and significantly reduces friction coefficients, thereby optimizing force transmission and reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a drive element and actuation lever are directly connected in motor vehicle closing devices, then the structure is simple, but high sliding friction occurs between the components
Solution Approach 1:
A rolling element is introduced as an intermediary component between the drive element and the actuation lever. This rolling element mediates the force transmission by converting direct sliding contact into rolling contact, thereby significantly reducing friction losses while maintaining structural simplicity.
2Productivity
If sliding friction is used between drive element and actuation lever, then the transmission path is direct, but force transmission efficiency is reduced
Solution Approach 1:
The sliding friction mechanism is replaced with a rolling friction mechanism by introducing a rolling element. This substitution changes the fundamental mechanical interaction from sliding contact to rolling contact, dramatically reducing friction forces and improving force transmission efficiency.
3Loss of energy
If a rolling element is introduced between drive element and actuation lever, then friction is reduced, but device complexity increases
Solution Approach 1:
The rolling element is introduced only at the specific location where friction occurs between the drive element and actuation lever. This localized application of the rolling contact principle reduces friction losses without unnecessarily complicating other parts of the system, maintaining overall structural simplicity.
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 achieves a substantial reduction in friction, enabling low-loss force transmission and allowing for efficient operation of motor vehicle closing devices with reduced force requirements, potentially using smaller electric motors, thus offering cost and weight advantages.
Implementation Method 1
The introduction of a friction-reducing rolling element as an intermediate element between the drive element and the actuation lever, which facilitates a rolling movement and significantly reduces friction coefficients
Data Source
AI summary
A drive unit for motor vehicle applications, in particular motor vehicle closing devices. The drive unit comprises an electric motor and at least one drive element driven by the electric motor. In addition, an actuation lever that cooperates with the drive element is provided. The drive element and/or the actuation lever are advantageously designed to be able to rotate about an axis. A rotatably mounted intermediate element is provided between the drive element and the actuation lever. According to the invention, the intermediate element is in the form of a friction-reducing rolling element.