Seat Back Inclination Fitting With Stabilized Eccentric Wedge Segments
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Solution Overview
Problem
Inclination adjustment fittings with wedge segments and springs can experience undesired displacement relative to the eccentric ring, leading to malfunction of the wobble mechanism due to the movable nature of the spring and wedge segments.
Innovation Solution
The spring device is securely supported on the eccentric ring, with the butterfly-shaped spring fixed on the contact cam, ensuring the wedge segments maintain a defined position relative to the eccentric ring, preventing displacement and ensuring proper eccentricity and play-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wedge segments are pressed apart by spring devices to increase eccentricity and eliminate play, then the reliability of the wobble mechanism is improved, but the wedge segments may undergo undesired displacement relative to the eccentric ring causing malfunction
Solution Approach 1:
The wedge segments are divided into multiple independent segments that can be individually positioned and constrained on the eccentric ring, allowing each segment to be separately secured while maintaining the overall eccentricity function
Solution Approach 2:
A retaining ring or clamp is introduced as an intermediary component that secures the wedge segments to the eccentric ring, preventing their displacement while allowing the spring devices to maintain pressing force for eccentricity
2Force
If the contact surface of the contact cam is situated at a small radial distance from the fitting part connected to the seat back, then the load transfer in overload conditions is improved, but the wedge segments may deform and cause play in the toothing
Solution Approach 1:
The contact cam is designed with different radial distances for different functions: a smaller radial distance for overload load transfer and a larger radial distance for normal operation tooth engagement, providing localized optimization of each function
Solution Approach 2:
The contact cam radius is made variable along its circumference, allowing the mechanism to dynamically switch between two operational modes: overload mode with smaller radius for load transfer and normal mode with larger radius for precise tooth engagement
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 configuration stabilizes the wedge segments, preventing unwanted displacement and ensuring reliable operation of the wobble mechanism by maintaining the required eccentricity and eliminating play in the toothing and bearing, thus enhancing the overall performance and durability of the inclination adjustment fitting.
Implementation Method 1
the wedge segments are pressed apart by spring device(s) acting against their one end faces for increasing the eccentricity
Implementation Method 2
one of the fitting parts is supported by an eccentric that is rotatable about the swivel axis, which, in turn, is supported by the other fitting part
Data Source
AI summary
An inclination adjustment fitting for seat backs of vehicle seats includes two fitting parts that are connected in a swiveling manner relative to each other via a wobble mechanism driven by an eccentric. The eccentric is formed from an eccentric ring and two wedge segments that are arranged in mirror image and set apart from each other and that in regions cover the circumference of the eccentric ring. The wedge segments are pressed apart by a spring acting against their one end faces for increasing the eccentricity and which are capable of being acted upon against the force of the spring by driving elements between the other end faces. The spring is supported on the eccentric such that the wedge segments occupy a defined position relative to the eccentric ring.