Variable Displacement Gear Train for High-Start-Torque Adjustment Drives
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Solution Overview
Problem
Existing motor-gear combinations in motor vehicle adjustment drives require larger motor dimensions to achieve necessary torque and adjustment time, leading to inefficiencies and increased space requirements.
Innovation Solution
A gear device using two double gearwheels with different circumferential regions and fixed translation ratios, allowing for high starting torque and reduced speed after a predefined angle, optimizing motor power usage and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a motor-gear combination is designed for maximum torque and required adjustment time, then the necessary torque and adjustment time are achieved, but the motor dimensions increase
Solution Approach 1:
The patent applies dynamics by implementing variable transmission ratios through a double gearwheel mechanism. The transmission ratio changes during operation: initially providing a high ratio for maximum starting torque to overcome icing and adhesion, then transitioning to a lower ratio for faster movement. This dynamic adjustment allows the motor to be dimensioned for average power requirements rather than peak torque, reducing motor size while maintaining performance.
2Force
If a larger motor is used to provide necessary maximum torque, then the torque requirement is met, but the device complexity increases
Solution Approach 1:
The patent segments the transmission system into a double gearwheel input mechanism with two different transmission ratios. This segmentation allows the system to provide different torque characteristics at different stages of operation without requiring an oversized motor. The first gearwheel provides high torque multiplication for starting, while the second provides lower ratio for continued movement, dividing the torque requirement across two functional segments.
3Productivity
If a single transmission ratio is used throughout the adjustment process, then the mechanism is simpler, but the adjustment efficiency decreases
Solution Approach 1:
The patent implements dynamic transmission ratio adjustment through the double gearwheel mechanism. During the adjustment process, the system automatically transitions between two transmission ratios: a first ratio for the initial phase requiring high torque, and a second ratio for the continuation phase requiring less torque but higher speed. This dynamic adaptation optimizes adjustment efficiency across the entire range of motion.
4Reliability
If the motor is dimensioned for worst-case conditions (icing, adhesion), then reliable adjustment under all conditions is achieved, but energy consumption increases
Solution Approach 1:
The patent employs periodic action through its two-stage transmission approach. The high-torque first transmission ratio is applied only during the initial period when maximum force is needed to overcome static friction, icing, and adhesion. Once movement is initiated, the system transitions to the second transmission ratio with lower energy consumption. This periodic application of high torque only when necessary reduces overall energy consumption while maintaining reliability.
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 gear device achieves efficient adjustment with reduced motor power requirements, minimizing space and cost while maintaining a high adjustment range with constant translation ratio.
Implementation Method 1
a toothing is formed on the first gearwheel which meshes with a toothing of the third gearwheel
Implementation Method 2
a toothing is formed on the second gearwheel which meshes with a toothing of the fourth gearwheel
Data Source
AI summary
Gear device for an adjustment drive device of a motor vehicle. The gear device includes an input gearwheel and an output gearwheel driven by the input gearwheel. The input gearwheel includes a first gearwheel and a second gearwheel coaxial to and rotationally fixed relative to the first gearwheel. The output gearwheel includes a third gearwheel and a fourth gearwheel coaxial to and rotationally fixed relative to the third gearwheel. The input gearwheel and the output gearwheel are positioned relative to one another such that in a first circumferential region of the input gearwheel, toothing formed on the first gearwheel is to mesh with toothing formed on the third gearwheel, and in a second circumferential region of the input gearwheel, toothing formed on the second gearwheel is to mesh with toothing formed on the fourth gearwheel.