Vehicle Seat Tip-Up Mechanism Locking Stability
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Solution Overview
Problem
Existing vehicle seat designs with long-slide functions face issues where the locking mechanism is inadvertently released when a large load is applied during sliding, causing the seat cushion to become occupiable prematurely.
Innovation Solution
Incorporating a third locking mechanism with an engagement pin and hook, along with a first restrictor, to prevent the seat cushion from being placed in an occupiable state when the seatback is rotated by the tip-up mechanism, thereby inhibiting the release of the second locking mechanism during large frontward sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seat cushion is allowed to rotate to an occupiable position during tip-up mechanism operation, then the seatback can be rotated frontward, but the second locking mechanism is inadvertently released causing premature sliding restriction removal
Solution Approach 1:
The first restrictor is positioned to contact the engagement pin before the seat cushion can rotate to an occupiable position during tip-up mechanism operation. This preliminary restriction prevents the engagement hook from rotating to the hook engaged position, thereby preventing premature release of the second locking mechanism while still allowing seatback rotation
Solution Approach 2:
The first restrictor acts as an intermediary element between the engagement pin and the engagement hook rotation. By contacting the engagement pin, the restrictor mediates the motion transmission, preventing the engagement hook from rotating to engage with the engagement pin, thus blocking the signal that would trigger the second locking mechanism release
2Adaptability or versatility
If the engagement hook is designed to rotate freely to engage with the engagement pin, then the seat cushion can be retained in the occupiable position, but the locking mechanism releases prematurely during large load sliding
Solution Approach 1:
The first restrictor applies a preliminary counter-action by contacting the engagement pin to prevent the engagement hook from rotating to the hook engaged position. This counter-action occurs before any harmful release of the second locking mechanism can occur, thereby maintaining sliding restriction stability while still allowing proper seat cushion positioning when needed
Data Source
AI summary
A vehicle seat of the present disclosure includes a seat cushion; a seatback; a sliding device; a first locking mechanism configured to restrict a sliding movement of a seat main body; a tip-up mechanism configured to rotationally displace the seat cushion upwardly from an occupiable position in conjunction with a frontward rotational movement of the seatback; a second locking mechanism configured to restrict a sliding movement of the seat main body when an elevation angle of the seat cushion exceeds a preset angle, and remove the restriction when the elevation angle is equal to or below a preset removal angle; and a first restrictor configured to restrict the elevation angle from being equal to or below the removal angle when the tip-up mechanism is activated.