Vehicle Seat Linkage Mechanism for Cushion Position Stability
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Solution Overview
Problem
Existing vehicle seats with reclining mechanisms have complex structures and a large number of parts, which complicates maintaining the seat cushion position when the rotation locking mechanisms are in a locking state and a vehicle occupant sits down.
Innovation Solution
A vehicle seat design featuring a base member, a back frame, a rotation locking mechanism, a cushion frame, a link member, and a fourth rotation shaft that moves within a long hole, with a movement restricting portion to prevent the seat cushion from changing position when the rotation locking mechanism is engaged, using a simple structure with fewer parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If coil springs are used to maintain the seat cushion position at the seatable position, then the seat cushion position stability is improved, but the number of parts and structural complexity increases
Solution Approach 1:
The invention extracts and eliminates the coil springs from the system by redesigning the linkage mechanism. The movement restricting portion is integrated into the existing linkage structure, removing the need for separate spring components while maintaining position stability through geometric constraints of the linkage mechanism.
Solution Approach 2:
The invention merges the position maintenance function into the linkage mechanism itself. The movement restricting portion is combined with the existing linkage components (cushion frame, link member, rotation shafts), integrating multiple functions into a unified structure that eliminates separate spring components.
2Stability of the object's composition
If coil springs are used to maintain the seat cushion position, then the position stability is improved, but the number of parts increases
Solution Approach 1:
The invention extracts and eliminates the coil springs from the system by redesigning the linkage mechanism. The movement restricting portion is integrated into the existing linkage structure, removing the need for separate spring components while maintaining position stability through geometric constraints of the linkage mechanism.
3Device complexity
If a simple structure with fewer parts is used, then the device complexity is reduced, but the ability to maintain seat cushion position may be compromised
Solution Approach 1:
The invention merges the position maintenance function into the linkage mechanism itself. The movement restricting portion is combined with the existing linkage components (cushion frame, link member, rotation shafts), integrating multiple functions into a unified structure that eliminates separate spring components.
Solution Approach 2:
The invention uses dynamic geometric constraints through the linkage mechanism. The movement restricting portion utilizes the relative motion and angular relationships between linkage components to automatically maintain position stability, replacing static spring forces with dynamic geometric control.
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 design ensures the seat cushion remains in its position even when a vehicle occupant sits down, with a reduced number of parts and a simplified structure, allowing smooth rotation and minimizing wear on components.
Implementation Method 1
a fourth rotation shaft that is fixed to the link member, and is inserted in the long hole so as to be able to move relatively in the length direction and so as to be able to rotate around its own axis
Implementation Method 2
a movement restricting portion that is provided at an inner surface of the long hole and at the fourth rotation shaft, and that, when the rotation locking mechanism is in the locking state and the seatback is in the state of usage, restricts movement of the fourth rotation shaft from the one end portion toward the other end portion side
Implementation Method 3
a rotation locking mechanism that switches between an unlocking state of permitting relative rotation of the back frame with respect to the base member, and a locking state of restricting the relative rotation
Implementation Method 4
a link member connected to the base member so as to be able to rotate around a third rotation shaft that is parallel to the first rotation shaft
Implementation Method 5
a cushion frame that is a frame member of a seat cushion, and is connected to the back frame so as to be able to rotate around a second rotation shaft that is parallel to the first rotation shaft
Data Source
AI summary
A vehicle seat includes a back frame connected to a base member so as to be able to rotate around a first rotation shaft; a rotation locking mechanism; a cushion frame connected to the back frame so as to be able to rotate around a second rotation shaft, and in which a long hole is formed; a link member connected to the base member so as to be able to rotate around a third rotation shaft; a fourth rotation shaft fixed to the link member and inserted in the long hole so as to be able to move relatively and so as to be able to rotate; and movement restricting portion provided between the fourth rotation shaft and an inner surface of the long hole, and that restricts movement of the fourth rotation shaft from one end portion of the long hole toward another end portion side.