Motor Vehicle Seat Adjusting Device Crash Force Transmission
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Solution Overview
Problem
Motor vehicle seat adjustment devices fail to effectively transmit crash forces, leading to potential collapse and increased weight and manufacturing costs due to the need for additional crash locks.
Innovation Solution
Incorporation of a U-shaped reinforcement element within the gear housing that provides a large contact surface between the threaded spindle and the gear housing, allowing for effective transmission of tensile and compressive forces during crashes without increasing the device's dead weight, and designed to engage only during crashes to prevent normal operation friction or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate crash lock is provided to stabilize seat structures during crashes, then the reliability of force transmission is improved, but the dead weight and manufacturing costs increase
Solution Approach 1:
The reinforcing element integrates multiple functions: it reinforces the gear housing, provides a bearing surface for the threaded spindle, and transmits crash forces. This consolidation eliminates the need for separate crash locks while maintaining reliability, thereby reducing dead weight and manufacturing costs.
Solution Approach 2:
The reinforcing element serves multiple purposes simultaneously: structural reinforcement, force transmission, and bearing support. This multi-functionality allows the adjusting device to handle crash forces without requiring additional specialized components, thus improving reliability without increasing weight.
2Reliability
If the threaded spindle and gear housing are reinforced to withstand crash forces, then the reliability is improved, but the manufacturing costs increase
Solution Approach 1:
The reinforcing element combines reinforcement functions for both the gear housing and threaded spindle support into a single component. This integration reduces the total number of parts and assembly steps, thereby lowering manufacturing costs while maintaining crash force resistance.
Solution Approach 2:
The reinforcing element utilizes the existing structural space within the gear housing, eliminating the need for additional external reinforcements. This self-contained design reduces manufacturing complexity and costs while ensuring adequate strength for crash scenarios.
3Reliability
If additional components are added to prevent adjusting device collapse during crashes, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The reinforcing element merges the functions of structural reinforcement, force transmission, and bearing support into a single integrated component. This consolidation maintains structural stability during crashes while reducing the overall number of components, thereby simplifying the device.
Solution Approach 2:
The reinforcing element is designed to perform multiple critical functions simultaneously, eliminating the need for separate specialized components for each function. This multi-functionality reduces device complexity while ensuring adequate reliability for crash scenarios.
Data Source
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AI summary
The invention relates to an adjusting device, in particular a height or longitudinal adjusting device for motor vehicle seats, comprising a threaded spindle that is rotatably mounted in a gearbox housing at one end and in a receiving unit at the other end, said receiving unit having an inner thread that is adapted to the spindle thread. The adjusting device also comprises a motor unit that is operatively connected to the threaded spindle. The aim of the invention is to provide an adjusting device and a seat base frame for motor vehicle seats with an adjusting device that transmits forces that occur in the event of a crash to the required degree. This is achieved in that a reinforcing element is provided in the gearbox housing such that said element is suitable for receiving forces that act in the longitudinal axial direction of the threaded spindle in the event of a crash.