Vehicle Seat Double Fitting with Movable Adapter for Crash Load Distribution
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Solution Overview
Problem
Existing double fittings for vehicle seats with integrated safety belts face challenges in distributing high crash loads while maintaining functional requirements for play elimination and actuation moments, leading to increased production complexity and costs.
Innovation Solution
A double fitting design where one adapter part is fixedly connected to a vehicle seat structure and the other is movable, allowing the fittings to operate independently during normal use but jointly accommodate crash loads after deformation, with adapter parts featuring projections and receptacles for limited mobility and engaging-around portions for enhanced strength.
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 for belt-integral seats is met, but the functional requirements for play elimination and actuation moments during adjustment are compromised
Solution Approach 1:
The double fitting is divided into two independently functioning fittings, each with its own adjustment mechanism and play elimination system. This segmentation allows each fitting to maintain its adjustment functionality while collectively providing the required strength through their parallel arrangement and rigid connection.
2Stability of the object's composition
If two individual fittings are rigidly connected with identical axis spacing, then structural stability is improved, but the tolerance compensation capability is reduced and production complexity increases
Solution Approach 1:
The two fittings are merged into a single double fitting assembly with a rigid connection that maintains identical axis spacing. This merging provides structural stability while the common manufacturing process and standardized components reduce production complexity and tolerance requirements compared to producing two separate fittings independently.
3Force
If an absolutely rigid connection of two fittings is made, then load distribution in crash events is improved, but the elimination of play during driving operation becomes more difficult
Solution Approach 1:
The rigid connection is implemented locally at the connection points between the two fittings to ensure proper load distribution during crashes. Meanwhile, the adjustment mechanisms within each fitting retain their ability to eliminate play through their individual wedge eccentric systems, achieving both load distribution and play elimination through localized design features.
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 design enables efficient production of double fittings that meet strength and functional demands without additional outlay, allowing for controlled deformation and load distribution during crashes, reducing the maximum load on occupants and improving the vehicle seat's safety features.
Implementation Method 1
it is possible with this technology to economically produce play-free and nevertheless easily adjustable single fittings
Implementation Method 2
classic tumble mechanism fittings with wedge eccentrics for elimination of play
Implementation Method 3
the first fitting part and the second fitting part are in geared connection with one another
Data Source
AI summary
A vehicle seat double fitting (10) includes two fittings (100) operatively connected to each other and each with a first fitting part (111) and a second fitting part (112) that are rotatable relative to one another around an axis (A) and are in geared connection or locked to one another. An adapter part (150) is connected to one of the first fitting parts (111) or the second fitting parts (112) and a second adapter part (160) is connected to other of the first fitting parts (111) or the second fitting parts (111, 112). Exactly one adapter part (150, 160) is fixedly connected to a structural part (3) of the vehicle seat and the other of the two adapter parts (150, 160) is limitedly moveable or rotatable around the axis (A), relative to the structural part (3) and the adapter part (150, 160) fixedly connectable to the structural part (3).