Gear-Driven Seat Angle Adjuster With Eccentric Cam Gap Removal
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Solution Overview
Problem
Existing seat angle adjusting mechanisms, particularly gear-driven systems, face limitations in achieving continuous adjustment and suffer from significant gaps between gears due to manufacture errors, leading to discomfort and reduced functionality.
Innovation Solution
A gear-driven adjusting assembly with a single inner-meshed planetary gear transmission, a gap removing mechanism using eccentric cams and springs, and a driving mechanism with a plastic ring for sealing and noise reduction, allowing for continuous manual and electrical adjustment with reduced seat back gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If double inner-meshed gear transmission is used, then adjustment continuity is improved, but manufacturing precision deteriorates due to inevitable errors causing large gaps
Solution Approach 1:
The patent introduces a gap removing mechanism with internal and external cams as intermediary elements between the double inner-meshed gears. These cams, actuated by a spring, actively compensate for manufacturing errors by forcing the gears into tight engagement, thereby eliminating gaps that would otherwise result from manufacturing imperfections while preserving continuous adjustment capability
Solution Approach 2:
The patent employs a spring mechanism that dynamically adjusts the engagement parameters of the double inner-meshed gears. By utilizing elastic deformation and force application, the system changes the positional parameters of the gears to eliminate gaps, transforming a static manufacturing error problem into a dynamically correctable condition
2Device complexity
If plate spring adjusting mechanism is used, then structure simplicity is improved, but adaptability deteriorates as continuous and electrical adjustment cannot be implemented
Solution Approach 1:
The patent designs the gear-driven adjusting assembly with a universal interface that can accommodate both manual operation and electrical actuation. The planetary gear mechanism and gap removing mechanism serve multiple functions: they enable continuous adjustment ranges beyond traditional detent systems while maintaining structural simplicity, and they can be operated either manually or through electrical motors, thus achieving multi-functionality without significantly increasing complexity
3Device complexity
If single inner-meshed gear transmission is used, then device complexity is reduced, but manufacturing precision deteriorates due to larger gaps compared to double inner-meshed
Solution Approach 1:
The patent introduces a gap removing mechanism with internal and external cams as intermediary elements between the single inner-meshed gears. These cams, actuated by a spring, actively compensate for manufacturing errors by forcing the gears into tight engagement, thereby eliminating gaps that would otherwise result from manufacturing imperfections
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
Enables continuous seat angle adjustment with smaller gaps, improved comfort, and adaptability to various applications, while being cost-effective and suitable for mass production.
Implementation Method 1
The spring is made of elastic material such as polyurethane, spring steel wire, elastic leaf
Implementation Method 2
An external cam of a gap removing mechanism is mounted between the central boss of the internal gear plate and an inner hole of the external gear plate. An internal cam is mounted between the inner hole of the external cam and the central boss of the internal gear plate
Implementation Method 3
said internal cam of the gap removing mechanism has n inclined wedge surfaces, and the external cam of the gap removing mechanism has n corresponding inclined wedge surfaces which can wedge with said inclined wedge surfaces
Data Source
AI summary
A gear-driven adjusting assembly for continuous adjustment of seat angle is disclosed. A external gear plate of the gear transmission mechanism is mounted in a internal gear plate with a eccentricity therebetween. An external cam of a gap removing mechanism is mounted between a central boss of the internal gear plate and the inner hole of the external gear plate. An internal cam is mounted between the inner hole of the external cam and the central boss of the internal gear plate, and a spring is mounted between the two cams, which form an eccentric cam mechanism. A central shaft of a driving mechanism is provided in the hole of the central boss of the internal gear plate, a driving block of the driving mechanism is provided between the internal cam and external cam. When the spring is in a free state, the internal cam and the external cam are wedged tightly to remove the seat gap; the driving block of the driving mechanism can overcome the elastic force by a moment to release the wedge effect of the gap removing mechanism, such that the gear transmission mechanism is driven for transmission and rotation, so as to achieve the purpose of adjusting seat angle. The assembly according to the present invention has the features of compact configuration, small gap, high strength as well as high universalness, and can conveniently implement the function of manual adjustment, electrical adjustment and continuous adjustment of the seat back angle.