Vehicle Seat Link Mechanism Reducing Size via Extraction
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Solution Overview
Problem
The existing vehicle seat designs with rotating seat cushions and backrests face size increases due to the need for protrusions and through-holes to transmit rotation, limiting installation flexibility and increasing manufacturing costs.
Innovation Solution
A vehicle seat design featuring a link mechanism where the rotation body is pressed by the seat back outside the connection member, eliminating the need for through-holes and allowing a reduced size, with a bent rotation body shape to minimize space requirements and enhance rigidity, and a biasing member to stabilize the rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through-hole is formed in the plate member to engage with the protrusion for transmitting rotation, then the rotation transmission function is achieved, but the size of the plate member and vehicle seat increases
Solution Approach 1:
The invention extracts the rotation transmission function from the plate member by using a separate rotation body that rotates independently. The protrusion on the seat back directly presses the rotation body, which is supported by a shaft on the plate member, eliminating the need for through-holes in the plate member while maintaining reliable rotation transmission.
Solution Approach 2:
The invention segments the rotation transmission mechanism into separate components: the protrusion on the seat back, the rotation body, the shaft, and the wire connection. This segmentation allows each component to perform its specific function efficiently without requiring the plate member to accommodate all functions, thus reducing the plate member's size.
2Reliability
If the plate member is provided with a through-hole for the protrusion, then the rotation of the seat back can be transmitted to the rotation body, but the manufacturing cost increases
Solution Approach 1:
The invention extracts the rotation transmission function from the plate member's through-hole structure and implements it through a dedicated rotation body mechanism. This eliminates the need for complex through-hole formation processes in the plate member, simplifying manufacturing and reducing costs.
Solution Approach 2:
By segmenting the rotation transmission into separate components (protrusion, rotation body, shaft, wire), the invention allows each component to be manufactured independently using simpler processes, reducing overall manufacturing complexity and cost compared to forming through-holes in the plate member.
3Reliability
If the size of the vehicle seat is increased to accommodate the through-hole installation space, then the rotation transmission mechanism can be installed, but the degree of freedom of seat installation position inside the vehicle decreases
Solution Approach 1:
The invention extracts the rotation transmission function from the plate member's internal structure (through-holes) and implements it externally using a rotation body supported by a shaft. This eliminates the need for additional installation space within the plate member, maintaining the vehicle seat's compact size and preserving installation flexibility.
Solution Approach 2:
By segmenting the rotation transmission mechanism into separate components, the invention reduces the space requirements within the plate member, allowing the vehicle seat to maintain its original dimensions and installation freedom while still achieving reliable rotation transmission.
Data Source
AI summary
Provided is a seat structure minimizes a size of a vehicle seat in which a rotation body rotates by being pressed by a seat back in interlocking a driving unit with the seat back. In a seat including a link mechanism which interlocks a driving unit with a seat back tilted toward a seat cushion, the back and cushion are connected to each other by a bracket at the side of the back and cushion in the vehicle width direction, and a transmission member which rotates to interlock the driving unit with the seat back is provided. The transmission member is adjacent to the bracket in the vehicle width direction and rotates by being pressed by the seat back tilted toward the seat cushion, and a portion pressed by the seat back in the transmission member is positioned outside compared to an outer edge of the connection bracket.