Seat Backrest Shoulder Adjustment With Long Stroke in Compact Space
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Solution Overview
Problem
The movement stroke of existing shoulder adjustment mechanisms for seat backrests is difficult to increase without increasing the mechanism's size, leading to space occupation and high costs.
Innovation Solution
A shoulder adjustment mechanism with a motor-driven lead screw system, where the rotating point of the transmission structure is separate from the base, allowing the lead screw to extend without enlarging the transmission structure, and incorporating worm-gear structures for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lead screw length is increased to extend movement stroke, then the movement stroke is improved, but the mechanism size and occupation space increase
Solution Approach 1:
The patent separates the rotating point of the transmission structure from the fixed position of the base, creating a spatial offset in the third dimension. This dimensional separation allows the lead screw to extend axially without proportionally increasing the overall mechanism envelope, resolving the contradiction between movement stroke and mechanism volume.
2Length of moving object
If the transmission structure size is increased to accommodate longer lead screw, then the movement stroke is improved, but the occupation space and cost increase
Solution Approach 1:
By positioning the rotating point spatially offset from the base fixed position, the patent enables the lead screw to utilize axial space rather than radial space. This dimensional reorganization allows extended movement stroke without increasing the footprint area of the transmission structure.
3Length of moving object
If the mechanism is enlarged to increase movement stroke, then the movement stroke is improved, but the applicability deteriorates
Solution Approach 1:
The spatial separation of the rotating point from the base creates a compact configuration that can be adapted to various installation environments. This dimensional arrangement allows the mechanism to maintain small overall size while providing adjustable movement stroke, thereby improving applicability across different vehicle seat applications.
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 adjustable stroke without increasing the mechanism's volume, enhancing applicability and saving space while maintaining functionality.
Implementation Method 1
a first transmission structure rotatably mounted on the first base and in driving connection with a motor, wherein a spacing exists between a rotating position of the first transmission structure and a fixed position of the first base; a first lead screw in transmission connection with the first transmission structure
Implementation Method 2
the motor drives the first lead screw to move up and down through the first transmission structure
Implementation Method 3
a pair of first hinges hingedly connected to the first sides and the second sides of the upper backrest frame and the lower backrest frame; the first lead screw brings the second hinges to move in the sliding grooves, thus realizing rotation of the upper backrest frame about the first hinges
Implementation Method 4
the lower backrest frame being provided with sliding grooves for allowing movement of the second hinges
Data Source
AI summary
The present disclosure relates to a shoulder adjustment mechanism for a seat backrest, comprising: an upper backrest frame (10) and a lower backrest frame (20) in an up-and-down arrangement, each of the upper backrest frame (10) and the lower backrest frame (20) including a first side and a second side opposing to each other in a left-right direction, a third side facing a seat, and a fourth side facing away from the seat; a pair of first hinges (30) hingedly connected to the first sides and the second sides of the upper backrest frame (10) and the lower backrest frame (20) and close to the third sides; a pair of second hinges (40) hingedly connected to the first sides and the second sides of the upper backrest frame (10) and the lower backrest frame (20) and close to the fourth sides, the lower backrest frame (20) being provided with sliding grooves (200); a first base (50) fixed to the lower backrest frame (20); a first transmission structure (60) rotatably mounted on the first base (50) and in driving connection with a motor, wherein a spacing exists between a rotating position of the first transmission structure (60) and a fixed position of the first base (50); a first lead screw (70) in transmission connection with the first transmission structure (60) and connected with the second hinge (40), wherein the motor drives the first lead screw (70) to move through the first transmission structure (60), thereby bringing the second hinges (40) to move in the sliding grooves (200).