Motor Vehicle Door Drive With Permanent Gear Play Compensation
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Solution Overview
Problem
Existing door drives for motor vehicle doors or flaps face challenges in providing permanent and robust play compensation in the drive train, as flexible prestressing elements can fatigue over time, failing to effectively manage component tolerances and wear.
Innovation Solution
The door drive design allows the output and force-transmission elements to be movable for play compensation, with the option to permanently fix them after compensation, eliminating the need for flexible prestressing elements by adjusting their relative or radial distances using control members like eccentric drives or movable toothed segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible prestressing elements are used for play compensation, then play compensation is achieved, but reliability deteriorates over time due to fatigue and wear
Solution Approach 1:
The patent employs a dynamic adjustment mechanism where the distance between the output element and force-transmission element can be modified. Control members such as eccentric drives or movable toothed segments enable the system to adapt the spacing to compensate for play, replacing static flexible elements with an adjustable rigid structure that maintains reliability over time
Solution Approach 2:
The invention changes the physical parameter of distance between components. By adjusting the spacing between the output element and force-transmission element through control members, the system compensates for play without relying on flexible materials that fatigue, thereby improving long-term reliability
2Reliability
If movable elements are used for play compensation, then play can be compensated, but device complexity increases
Solution Approach 1:
The control members (eccentric drives or movable toothed segments) serve multiple functions: they adjust the distance between components for play compensation, maintain mechanical coupling through toothing engagement, and can be integrated into existing door drive structures. This multi-functionality reduces the need for separate adjustment mechanisms, balancing complexity with effectiveness
Data Source
AI summary
A door drive for a motor vehicle door or motor vehicle flap, which is provided with an electromotive drive, a transmission downstream of the drive, and a force-transmission element. The force-transmission element is operatively connected to a leaf of the motor vehicle door or motor vehicle flap. An output element of the transmission and the force-transmission element are coupled by a toothing with compensation for play. According to the invention, the output element and/or the force-transmission element are not only designed to be moveable for play compensation, but can also be permanently fixed after the compensation for play.