Vehicle Seat Gear Stage Torque Fluctuation Compensation
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Solution Overview
Problem
Conventional vehicle seat adjusters experience torque fluctuations due to eccentric epicyclic gearing, leading to noise and imbalance issues, which existing technologies fail to fully compensate for.
Innovation Solution
A gear stage with drive and driven wheels featuring teeth of varying dimensions and spacings, allowing for a non-whole number gear ratio that compensates for torque fluctuations, and includes filling material for high-load situations, ensuring balanced construction and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gear stage with whole number gear ratio is used, then the construction is simple, but torque fluctuations occur due to eccentric epicyclic gearing causing noise and imbalance
Solution Approach 1:
The patent applies local quality by making individual teeth of the drive wheel or driven wheel different from each other in specific aspects (dimensions, spacing, axial positions) while other teeth remain standard. This localized variation in tooth characteristics enables the gear stage to compensate for torque fluctuations without requiring complete redesign of the entire gear system, thus resolving the contradiction between torque compensation and construction simplicity.
Solution Approach 2:
The patent changes geometric parameters of the gear teeth (dimensions, spacings, axial positions) to achieve a gear ratio that deviates from whole numbers. This parameter modification allows the gear stage to counteract torque fluctuations caused by eccentric epicyclic gearing, improving reliability while maintaining relatively simple construction by only altering tooth parameters rather than the entire gear mechanism.
2Reliability
If different dimensions and spacings of teeth are implemented, then torque fluctuations are compensated, but manufacturing complexity increases
Solution Approach 1:
By applying local quality, only specific teeth are manufactured with different dimensions or spacings while the majority of teeth remain standard. This approach enables torque compensation through selective tooth variation, significantly reducing manufacturing complexity compared to producing all teeth with different characteristics, thus resolving the contradiction between torque compensation and ease of manufacture.
3Reliability
If asymmetries are introduced in gear wheels, then torque compensation is achieved, but imbalance occurs requiring mirror-symmetrical duplication
Solution Approach 1:
The patent intentionally introduces asymmetry in the form of mirror-symmetrical duplication of gear wheels with different tooth configurations. Each duplicated gear wheel is asymmetric relative to the other, and together they form a symmetric assembly. This approach enables torque compensation through the asymmetric tooth variations while maintaining overall balance and stability of the gear stage, resolving the contradiction between torque compensation and object composition stability.
Data Source
AI summary
An adjuster for a vehicle seat, in particular for a motor vehicle seat, includes a drive, a gear stage (8) driven by the drive. The gear stage (8) includes a drive wheel (81) rotatable about a first rotational axis (A1) and drive teeth (81a) and a driven wheel (82) rotatable about a second rotational axis (A2) and including driven teeth (82a). Driven wheel (82) meshes with the drive wheel (81) with a fluctuating gear ratio and at least one load bearing gear driven by the gear stage, in particular a geared fitting. The fitting parts thereof performing a relative rotation with a superimposed wobble motion. At least two drive teeth (81a) and/or at least two driven teeth (82a) in the circumferential direction of the associated rotational axis (A1, A2) have different dimensions and/or different spacings from the adjacent teeth, and/or in the axial direction of the associated rotational axis (A1, A2), different dimensions and/or different axial positions.