Vehicle Seat Fitting with Relocated Locking Stop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle seat fittings with internal stops on both the clasping ring and the second fitting part increase production costs, especially when the second fitting part requires additional design for cases without internal stops, and existing solutions do not efficiently absorb larger moments or reduce stop forces.
Innovation Solution
Relocating the locking stop from the second fitting part to the structural part, using radially protruding limit stops on the enclosing ring, and incorporating an eccentric planetary gear for continuous inclination adjustment, which reduces production costs and allows for larger moment absorption or reduced stop forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal stops are formed on both the clasping ring and the second fitting part, then the inclination setting is limited, but the production cost of the second fitting part increases
Solution Approach 1:
The locking stop is extracted from the second fitting part and relocated to the structural part (adapter). This separates the stop function from the second fitting part, allowing it to be produced without additional design complexity while maintaining the inclination limitation function through interaction between the limit stops on the clasping ring and the locking stop on the adapter.
Solution Approach 2:
The locking stop on the structural part acts as an intermediary element that works in conjunction with the limit stops on the clasping ring to achieve inclination limitation. This intermediary approach allows the stop function to be distributed across multiple components rather than concentrated in the second fitting part, reducing its manufacturing complexity.
2Ease of operation
If an eccentric planetary gear is used, then continuous inclination adjustment is enabled, but a wobbling movement is superimposed on the relative rotation
Solution Approach 1:
The eccentric planetary gear mechanism is used to enable continuous adjustment of the backrest inclination angle. The eccentric arrangement allows the gear wheel to roll on the ring gear in a controlled wobbling motion, providing continuous angular adjustment while the dynamic interaction between the gear components maintains functional stability 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 decreases production costs for the second fitting part, maintains low tool costs by using identical larger parts, and enables continuous adjustment of the backrest inclination with reduced material usage and improved dynamic stability.
Implementation Method 1
The basic portion for locking the eccentric planetary gear is applied by the friction between the eccentric and one of the two fitting parts, preferably the second fitting part
Data Source
AI summary
The invention relates to a fitting (10) for a vehicle seat, in particular for a motor vehicle seat, comprising a first fitting part (11) and a second fitting part (12) which can be rotated with respect to each other, a clip ring (13) which is fixed to the first fitting part (11) for holding both fitting parts (11, 12) axially together by means of an outer ring section (13b) and engaging the second fitting part (12) by means of an inner annular section (13a), and stops (13g, 15) which define the limits of the relative rotation of both fitting parts (11, 12) and which comprise at least one limiting stop (13g) embodied as a clip ring (13) and at least one locking stop (15) which is joined to the second fitting part (12) such that the limiting stop (13g) protrudes outwards from outside of the annular section (13b) of the clip ring (13) and the limiting stop (15) is provided on a structural part secured to the second fitting part (12).