Vehicle Headrest Composite Mechanism for Long Stroke Adjustment
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Solution Overview
Problem
Existing headrest mechanisms in vehicle seats, particularly for zero-gravity seats, suffer from insufficient stroke, large occupied space, and compromised appearance due to exposed components.
Innovation Solution
A composite motion mechanism combining a screw-nut mechanism and a pinion-rack mechanism is employed to enhance the stroke of the headrest, while minimizing space occupation and maintaining a sleek appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a screw-nut mechanism is used to drive the headrest, then the headrest can be adjusted in position, but the stroke is insufficient for zero-gravity seat requirements
Solution Approach 1:
The patent combines a screw-nut mechanism and a pinion-rack mechanism into a composite motion mechanism. The screw-nut mechanism provides precise positioning while the pinion-rack mechanism extends the stroke, achieving both sufficient adjustment range and comfort for different users in zero-gravity seat applications
2Ease of operation
If a screw-nut mechanism is arranged inside the seat backrest, then the headrest can be adjusted, but it occupies large space in the seat backrest
Solution Approach 1:
The patent nests the pinion-rack mechanism within the structure of the screw-nut mechanism, with the pinion mounted on the nut and the rack integrated into the headrest assembly. This nested arrangement allows both mechanisms to cooperate in a compact configuration, reducing the overall space occupied in the seat backrest while maintaining full adjustability functionality
3Length of moving object
If the headrest has a large stroke, then comfort for different users is improved, but mechanical parts become exposed and appearance is compromised
Solution Approach 1:
By nesting the pinion-rack mechanism within the screw-nut mechanism structure, the patent conceals the mechanical components that would otherwise be exposed during large-stroke adjustment. The integrated design allows the headrest to achieve extended travel while maintaining a sleek, uninterrupted appearance without visible mechanical parts
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 combined mechanism doubles the stroke of the headrest, meets comfort requirements for diverse users, and ensures a visually appealing design by concealing mechanical components.
Implementation Method 1
a lead screw (71) that can be driven by the headrest electric motor (40) to rotate and a nut (72) that is movable along the lead screw (71)
Implementation Method 2
a pinion (12) that is rotatably coupled to the nut (72) and a rack (13) that is coupled to the headrest (20), wherein the pinion (12) engages the rack (13)
Data Source
AI summary
The present invention relates to a seat headrest device comprising a fixed base (30), a headrest (20) and a headrest electric motor (40). The headrest electric motor (40) drives the headrest (20) to move relative to the fixed base (30) through a composite motion mechanism comprising a screw-nut mechanism (70) and a pinion-rack mechanism (10). The present invention further discloses a seat headrest device comprising the seat headrest device. The seat headrest device has the following characteristics: a stroke of the headrest can be significantly enhanced by means of the composite movement mechanism.