Automotive Seat Fitting Axial Preload Spring Elements
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Solution Overview
Problem
Adjustment fittings for motor vehicle seats with planetary gears experience noise pollution and jerky effects due to wear over time, leading to increased play and reduced reliability.
Innovation Solution
The fitting incorporates spring elements arranged on a bearing disk to secure planet gears axially, providing preload that compensates for wear and minimizes play, ensuring reliable operation without noise or jerking, even after extended use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If planet gears are used in the fitting, then precise adjustment and self-locking are achieved, but noise pollution and jerky effects occur after longer periods of operation due to wear and play
Solution Approach 1:
Spring elements are pre-installed on the bearing disk to apply continuous axial prestressing force on the planet gears before wear occurs. This preliminary action maintains gear mesh tension and prevents play development, ensuring noise-free operation throughout the service life of the fitting
Solution Approach 2:
The spring elements change the axial position parameter of the planet gears through elastic deformation. By adjusting the spring preload force, the axial clearance between planet gears and the fitting part is controlled, maintaining optimal meshing conditions and eliminating play even after wear occurs
2Reliability
If minimum play is provided for unfavorable tolerance positions, then the hardware works reliably, but noise pollution and bucking effects increase over time due to wear
Solution Approach 1:
Spring elements dynamically adjust the axial position of planet gears through elastic deformation, compensating for wear-induced parameter changes. This maintains optimal gear meshing parameters throughout operation, preventing noise and bucking effects while preserving reliability
Solution Approach 2:
The spring elements introduce dynamic adaptability to the rigid gear system. As wear occurs, the springs compress or extend to maintain constant axial prestressing force, automatically adapting to changing clearance conditions and preventing noise without compromising reliability
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 effectively reduces wear and noise, maintaining a play-free operation over time by securing planet gears with spring elements, ensuring high reliability and precise adjustment of motor vehicle seat components.
Implementation Method 1
at least two, preferably three, spring elements prestressing the planetary gears in the direction of the axis of rotation on the fitting lower part or fitting upper part
Implementation Method 2
the spring element is arranged inside the fitting in such a way that, depending on its arrangement, it exerts a prestressing force on the planet gears
Data Source
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AI summary
Fitting for an adjustment device of a motor vehicle seat. The invention relates to a fitting (1) for an adjustment device, in particular inclination adjustment of a motor vehicle seat, with a fitting upper part (2) having a first internal toothing (4), a fitting lower part (3) which is adjustable relative to the fitting upper part about a fitting axis and has a second internal toothing (5) arranged coaxially with respect to the first internal toothing, at least two, preferably, three, rotatably arranged planet gears (7) which are in engagement with the first and second internal toothings, and a drive shaft (6) which is in operative connection with the at least two planet gears by means of a pinion (23). In order to provide a fitting of the type mentioned at the beginning, in which noise loads and buckling effects are avoided even after a relatively long period of operation, a spring element (11) prestressing the planet gears (7) in the direction of the axis of rotation onto the fitting lower part (3) or fitting upper part (2) is provided.