Headrest structure
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Solution Overview
Problem
The existing zero-gravity seat headrests have complex structures that occupy too much space, leading to a thin comfort layer and a compromised riding experience due to non-rigid connections between mechanisms.
Innovation Solution
An integrated headrest structure with a lead screw motor, gear mechanism, and transmission racks, where the gear mechanism is engaged between rear cover racks and transmission racks, allowing for a more rigid and space-efficient design that enhances structural strength and comfort layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a composite movement mechanism consisting of lead screw-nut mechanism, gear-rack mechanism and slider mechanism is used to drive the headrest, then the headrest can be adjustable over a large stroke, but the structure becomes complex and occupies a lot of headrest layout space
Solution Approach 1:
The patent combines the lead screw-nut mechanism and gear-rack mechanism into an integrated structure where the nut mechanism is directly connected to the gear mechanism, eliminating the need for separate slider mechanisms. The transmission racks are rigidly connected to form a unified transmission system that reduces overall structural complexity while maintaining the headrest adjustment functionality.
Solution Approach 2:
The patent implements a nested arrangement where the gear mechanism is positioned within the headrest rear cover plate structure, and the transmission racks are integrated into the headrest driving seat. This nesting approach allows multiple mechanisms to occupy overlapping spatial volumes, significantly reducing the overall space required for the transmission system.
2Ease of operation
If three mechanisms (lead screw-nut mechanism, gear-rack mechanism and slider mechanism) are used to drive the headrest, then the headrest can move relative to the fixed base, but the mechanisms occupy a lot of headrest layout space which leads to a thin comfort layer
Solution Approach 1:
By merging the lead screw-nut mechanism and gear-rack mechanism into a unified transmission system with rigid connections, the patent reduces the total volume occupied by mechanical components. This consolidation frees up space within the headrest structure that can be allocated to increasing the comfort layer thickness.
Solution Approach 2:
The patent redistributes the transmission mechanisms along the longitudinal axis of the headrest, placing the lead screw motor in the headrest driving seat and extending the transmission racks along the length of the structure. This dimensional arrangement optimizes space utilization and allows for a thicker comfort layer in the lateral dimension.
3Productivity
If the lead screw motor is fixed to the headrest driving seat, then the motor can drive the gear mechanism to move, but vibration and working noises occur during operation
Solution Approach 1:
The patent incorporates a rubber flat washer between the lead screw motor mounting bolt and the headrest driving seat structure. This rubber element acts as a vibration isolator and noise dampener, absorbing mechanical vibrations and reducing noise transmission from the motor to the headrest structure before they can propagate.
Solution Approach 2:
The rubber flat washer serves as an intermediary element between the lead screw motor and the headrest driving seat, mediating the mechanical connection while filtering out harmful vibrations and noises. This intermediary component protects the headrest structure from direct exposure to motor-induced vibrations.
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 provides a more robust and comfortable headrest with increased space for the comfort layer, reducing vibration and noise, and offering a new sensory experience with a lighter and more aesthetically pleasing design.
Implementation Method 1
the lead screw motor drives the gear mechanism to move according to a principle of a lead screw transmission mechanism
Implementation Method 2
the gear mechanism consists of a nut mechanism, a shaft sleeve, a gear shaft and gears
Implementation Method 3
the flat washer is made of rubber. With the adoption of a fixing structure in which the bolt and the flat washer are superimposed, vibration and working noises can be reduced during operation of the lead screw motor
Data Source
AI summary
A headrest structure, comprising a headrest driving seat (400) fixed to a seat backrest, a lead screw motor (410), a gear mechanism (330), transmission racks (320) and a headrest part (10). The headrest structure further comprises a headrest rear cover plate (200) disposed on a rear side of the headrest part (10), wherein the headrest rear cover plate (200) is provided thereon with rear cover racks (220). The gear mechanism (330) is engaged between the rear cover racks (220) and the transmission racks (320). The lead screw motor (410) drives the gear mechanism (330) to move according to the principle of a lead screw transmission mechanism, thereby driving the headrest part (10) to move relative to the headrest driving seat (400).