Vehicle Seat Double Fitting With Elastic Adapter Load Sharing
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Solution Overview
Problem
Existing double fittings for vehicle seats with integrated safety belts face high load requirements during crashes, leading to increased production costs and complexity due to rigid connections, which also result in noise and functional issues during normal operation.
Innovation Solution
A double fitting design featuring two interconnected fittings with a geared connection and adapter parts, where one adapter part is fixedly connected to a vehicle seat structure and the other is rotatable, incorporating an elastic element to dampen noise and allow limited mobility, ensuring strength and functionality during crashes while maintaining play-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two fittings are rigidly connected in parallel to form a double fitting, then the strength requirement is met, but the device complexity increases and manufacturing precision requirements increase
Solution Approach 1:
The adapter is segmented into a first adapter part and a second adapter part that can move relative to each other. This segmentation allows the double fitting to meet strength requirements through parallel connection while reducing complexity by enabling independent adjustment of each fitting's axis spacing, eliminating the need for precise alignment during assembly.
2Strength
If two fittings are rigidly connected in parallel, then the strength requirement is met, but the manufacturing precision requirements increase
Solution Approach 1:
The second adapter part is designed to move relative to the first adapter part, allowing the axis spacing of the second fitting to be adjusted independently. This dynamic adjustment capability eliminates the need for high manufacturing precision in aligning the two fittings during assembly, as each fitting can be independently positioned to compensate for tolerances.
3Strength
If a rigid connection is used, then the strength requirement is met, but noise is generated during operation
Solution Approach 1:
A damping element is introduced between the first and second adapter parts to provide flexible connection. This flexible connection dampens vibrations and prevents noise generation during operation, while the overall structure maintains sufficient strength through the parallel arrangement of the two fittings.
4Strength
If a rigid connection is used, then the strength requirement is met, but functional requirements are compromised
Solution Approach 1:
The movable second adapter part enables independent adjustment of the second fitting's axis spacing, allowing the mechanism to maintain play-free operation and satisfy functional requirements during backrest adjustment. This dynamic adjustment capability ensures that both fittings can operate independently while maintaining strength through their parallel connection.
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 design effectively distributes high loads during crashes and maintains functional performance without additional outlay, reducing noise and enhancing tolerance compensation, thus addressing the challenges of high load requirements and operational noise.
Implementation Method 1
at least one elastic element is arranged between the adapter parts
Implementation Method 2
incorporating an elastic element to dampen noise
Data Source
AI summary
A double fitting for a vehicle seat may have a first fitting part and a second fitting part that are drivingly connected to each other. The double fitting may also have adapter parts that can be connected to at least one of the fitting parts. One of the adapter parts can be connected to a structural part of the vehicle seat or to a vehicle body part, and the other adapter part is movably connected to a limited degree to the other adapter part which can be rigidly connected to the structural part or the vehicle body part. An elastic element is arranged between the adapter parts, a first fitting of the fittings is arranged axially between the adapter parts, and one of the adapter parts is arranged axially between the fitting. A vehicle seat having the double fitting is also disclosed.