Headrest Gear Structure for Fine Adjustment Under High Load
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Solution Overview
Problem
Existing headrest moving devices cannot minutely adjust the position of a headrest while withstanding high loads and maintaining durability, especially when some teeth are disengaged, leading to reduced durability and operational limitations.
Innovation Solution
A headrest moving device with first and second gears having numerous teeth in widthwise and lengthwise directions, connected via links and brackets, allowing for precise adjustment and engagement/disengagement with a spring mechanism to maintain stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerous small teeth are formed in the gear to minutely adjust the headrest position, then the adjustment precision is improved, but the durability of the teeth is reduced and they are easily damaged
Solution Approach 1:
The gear is divided into multiple gear units, each with its own set of teeth. This segmentation allows the system to achieve fine adjustment precision through the combination of multiple gear units while distributing the mechanical load across all units, preventing any single set of teeth from being overloaded and damaged.
Solution Approach 2:
Multiple gear units are combined to form a single integrated gear system. The teeth from multiple gear units work together to provide both the precision of numerous small teeth and the durability of distributed load-bearing capacity, resolving the contradiction between fine adjustment and tooth durability.
2Measurement precision
If numerous teeth are formed in the gear to enable fine adjustment, then the adjustment precision is improved, but the device complexity increases
Solution Approach 1:
Instead of creating one complex gear with numerous teeth, the system segments the gear into multiple simpler gear units. Each unit has a manageable number of teeth, reducing the complexity of individual gear manufacturing and assembly while achieving the cumulative precision effect of numerous teeth through their combined operation.
3Reliability
If some teeth are disengaged in the gear, then the device cannot be operated, but this reduces the adaptability and durability
Solution Approach 1:
The gear system is segmented into multiple independent gear units, each capable of providing functional engagement. If teeth in one gear unit become disengaged or damaged, the other gear units remain operational, allowing the device to continue functioning with reduced but still adequate performance, thereby improving adaptability to partial failures.
Solution Approach 2:
The system is designed with redundant gear units that serve as backup capacity. This beforehand cushioning against potential tooth disengagement ensures that even if some teeth fail to engage, the device maintains operational reliability through the remaining engaged teeth in other gear units.
Data Source
AI summary
Provided is a headrest moving device. When first and second gears, each of which has numerous teeth formed in widthwise and lengthwise directions, are engaged, the numerous widthwise teeth are engaged, and the numerous lengthwise teeth are engaged. Due to the teeth, it is possible to minutely adjust a position of a headrest and to withstand a high load. Even when some of the teeth are disengaged, the headrest moving device can be operated and provides excellent durability.