Seat Rotation Linkage Using a Linear Guide for Smooth Turning
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Solution Overview
Problem
Existing seat rotating devices require precise calculation and processing of curved rails and sliders for smooth movement, which is complex and time-consuming, and the transition between arc-shaped dentitions needs accurate calculation for proper meshing.
Innovation Solution
A seat rotating device with a coupling unit that includes a link, guide, and moving body, where the guide extends linearly along a virtual circle's diameter, allowing the rotating plate to move relative to the base plate without needing precise locus calculation, using a drive unit with a feed screw and motor to rotate the seat between seating and getting-on/off positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a curved rail and curved slider are used for seat rotation, then smooth movement between seating and getting-on/off positions is achieved, but precise locus calculation and complex processing are required
Solution Approach 1:
Instead of using a curved guide that requires precise locus calculation, the patent inverts the approach by using a linear guide with a moving body that carries the rotating plate. The linear guide is simpler to manufacture, and the rotation is achieved through the coupling of the moving body's linear motion with the rotating plate's rotation, eliminating the need for complex curved path calculations.
Solution Approach 2:
The patent segments the motion into two independent components: linear motion along the linear guide and rotation about the rotating end. This segmentation allows each component to be designed and manufactured separately with simpler requirements, avoiding the need for a single complex curved trajectory that would require precise locus calculation.
2Reliability
If arc-shaped dentitions are used in the dentition forming member, then meshing with the pinion is achieved, but accurate calculation and processing of transition portions are required
Solution Approach 1:
The patent eliminates the need for arc-shaped dentitions by inverting the drive mechanism. Instead of using a pinion meshing with arc-shaped dentitions on a dentition forming member, the invention uses a linear slider moving along a linear guide that carries the rotating plate. This eliminates the complex transition portions between arc-shaped dentitions and the need for precise meshing calculations.
Solution Approach 2:
The patent extracts and removes the complex dentition forming member with arc-shaped dentitions from the system. The rotation function is achieved through a simpler mechanism involving the linear guide, moving body, and rotating plate, eliminating the need for pinion-dentition meshing and its associated manufacturing precision requirements.
3Device complexity
If a linear guide and moving body are used instead of curved rail, then locus calculation is omitted and structure is simplified, but smooth rotation must be maintained
Solution Approach 1:
The patent merges the linear motion function and rotation function into a single integrated mechanism. The moving body that moves linearly along the linear guide also carries the rotating plate, combining translational and rotational motions in one component. This merging achieves smooth rotation without requiring complex curved guides, as the linear motion of the moving body is directly coupled with the rotation of the plate.
Solution Approach 2:
The patent introduces a rotating plate that rotates about a fixed rotating end, creating a circular motion path for the rotating plate while the moving body follows a linear path. This combination of linear guide and rotational element achieves smooth rotation without requiring the moving body itself to follow a curved trajectory, thus avoiding locus calculation while maintaining operational smoothness.
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
This design simplifies the structure and eliminates the need for precise locus calculation, enabling smooth and efficient rotation of the seat body between positions while stabilizing the seat and reducing operational complexity.
Implementation Method 1
a feed screw and motor to rotate the seat between seating and getting-on/off positions
Data Source
AI summary
A seat rotating device includes a base plate, a rotating plate, a coupling unit, and a drive unit. The coupling unit includes a link, a guide having a linearly extending shape, and a moving body that is movable along the guide and supports the rotating plate. The drive unit can move the moving body along the guide. The link includes a fixing end and a rotating end. The guide has a shape extending linearly along a diameter of a virtual circle, the virtual circle having length twice the distance between the fixing end and the rotating end as its radius, and having the fixing end as its center. The moving body moves the rotating plate along the guide while relatively rotating the rotating plate with respect to the moving body.