Vehicle Seat Inclination Adjustment Eccentric Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing inclination adjustment fittings in vehicles are prone to malfunction due to undesired displacement of wedge segments with the spring relative to the eccentric ring, leading to play in the toothing and bearing, which can cause the wobble mechanism to fail.
Innovation Solution
The design incorporates a spring device supported on the eccentric ring, ensuring the wedge segments occupy a defined position, preventing relative movement and maintaining eccentricity, with the spring fixed on a contact cam between the wedge segments to maintain optimal configuration and prevent play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spring device and wedge segments are made movable relative to the eccentric ring to enable adjustment, then the inclination adjustment function is achieved, but undesired displacement and malfunction occur
Solution Approach 1:
The contact cam acts as an intermediary element between the spring device and the wedge segments. The spring device presses against the contact cam, which in turn presses against the wedge segments, providing a stable force transmission path while allowing the wedge segments to maintain their adjusted position relative to the eccentric ring.
Solution Approach 2:
The spring device is pre-configured to press the wedge segments against the contact cam, establishing a predetermined force relationship before operation. This preliminary action ensures that the wedge segments are always held in their adjusted position without requiring additional locking mechanisms.
2Force
If the contact surface of the contact cam is positioned at a small radial distance to transfer load in overload, then load transfer capability is improved, but the wedge segments may deform and lose positional stability
Solution Approach 1:
The contact cam is designed with different functional zones: a first contact surface at a small radial distance for load transfer in overload conditions, and a second contact surface at a larger radial distance for normal operation. This local differentiation allows the system to optimize for both load transfer and positional stability in different operating conditions.
3Manufacturing precision
If the wedge segments are pressed apart to increase eccentricity for play-free operation, then the toothing play is eliminated, but the spring device may displace relative to the eccentric ring
Solution Approach 1:
The contact cam serves as a stable intermediary that is fixed to the eccentric ring. The spring device presses against this stable reference, ensuring that the force applied to the wedge segments remains consistent and that the spring device itself does not displace relative to the eccentric ring during operation.
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 enhances the stability and reliability of the wobble mechanism by preventing unwanted displacement of the wedge segments, ensuring the fitting parts remain free from play and maintain the required eccentricity, thus avoiding malfunctions.
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
Implementation Method 3
The eccentric includes two wedge segments that are supported by an eccentric ring and are pressed apart in the sense of increasing eccentricity
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.