Recliner with a locking- and unlocking device having two independently adjustable locking mechanisms
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Solution Overview
Problem
Existing backrest adjustment devices for motor vehicle seats face challenges in securely locking and adjusting the backrest without play, especially under high forces, while maintaining precise control over the locking mechanisms.
Innovation Solution
A backrest fitting with a covering and unlocking device that employs a snail toothing and snail wheel mechanism, combined with radial and axial clamping elements, to securely lock the snail in place, allowing for precise adjustment and high-force absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single locking mechanism is used in existing backrest adjustment devices, then the device complexity is reduced, but the reliability of locking under high forces deteriorates
Solution Approach 1:
The locking mechanism is divided into two independent locking mechanisms (first locking mechanism with radial clamping element and second locking mechanism with axial clamping element) that act on the worm at different positions and directions. Each locking mechanism independently secures the worm, providing redundant locking capability that enhances reliability under high forces while maintaining manageable device complexity through modular design.
2Force
If radial and axial clamping elements are used to securely lock the worm, then the force absorption capability is improved, but the ease of operation deteriorates
Solution Approach 1:
The actuating elements of the first and second locking mechanisms are coupled together such that a single actuating operation simultaneously controls both the radial clamping element and the axial clamping element. This merging of control functions allows the dual-locking system to absorb high forces while maintaining ease of operation through unified actuation.
3Measurement precision
If two independently adjustable locking mechanisms are used, then the precision of position control is improved, but the device complexity increases
Solution Approach 1:
The first locking mechanism with radial clamping element provides precision control in the radial direction, while the second locking mechanism with axial clamping element provides precision control in the axial direction. Each locking mechanism is optimized for its specific directional control function, achieving high position control precision while keeping each individual mechanism relatively simple in structure.
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 solution provides a secure, play-free adjustment mechanism that can absorb high forces, ensuring precise control over the backrest's position and facilitating easy operation through a simple actuation mechanism.
Implementation Method 1
one of the fitting parts is assigned a worm with worm teeth and the other fitting part is assigned a worm wheel, wherein the worm teeth engage in the worm wheel
Implementation Method 2
the first locking mechanism acts on the worm in the locking position radially to the longitudinal extent of the worm and the second locking mechanism acts on the worm in the locking position axially in the longitudinal extent of the worm
Data Source
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AI summary
The invention relates to a backrest adjustment fitting having a locking and unlocking device which locks two fitting parts (10, 20) of the backrest adjustment fitting in a locking position (I), wherein a worm screw (40) having worm gearing (41) is associated with one of the fitting parts (10, 20) and a worm wheel (11) is associated with the other fitting part (10, 20), wherein the worm gearing (41) meshes with the worm wheel (11). The locking and unlocking device has two locking mechanisms (50, 50R; 60, 60A), wherein the first locking mechanism (50, 50R), in the locking position (I), acts on the worm screw (40) radially with respect to the longitudinal extension (X) of the worm screw (40), and the other locking mechanism (60, 60A), in the locking position (I), acts on the worm screw axially in the longitudinal extension (X) of the worm screw (40), such that the worm screw (40) having worm gearing (41) is arranged so as to be doubly braced in the worm wheel (11).