Seat Slide Device Dynamic Locking Mechanism
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Solution Overview
Problem
Existing seat slide devices for vehicles face issues with excessive resistance during upper rail movement due to constant elastic pressure and dimensional accuracy errors, leading to rattling when locked or unlocked.
Innovation Solution
A seat slide device with a lock member, interlocking mechanism, and movable portions that adjust the gap between guiding and movable portions to minimize resistance in the unlocked state and prevent rattling in the locked state, using a slider and guide mechanism to transmit movement and adjust the position of the movable portions relative to the guiding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the plastic projection is constantly pressed against the lower rail to prevent rattling, then rattling is prevented, but resistance to movement of the upper rail increases excessively
Solution Approach 1:
The movable portion is configured to dynamically change its position relative to the guiding portion based on the locked/unlocked state. In the locked state, the movable portion approaches the guiding portion to prevent rattling. In the unlocked state, the movable portion separates from the guiding portion to reduce movement resistance. This dynamic adjustment resolves the contradiction between preventing rattling and reducing movement resistance.
2Stability of the object's composition
If the plastic projection is constantly pressed against the lower rail, then rattling is prevented, but errors in dimensional accuracy cause excessive elastic force and increase resistance to movement
Solution Approach 1:
The movable portion dynamically adjusts its engagement with the guiding portion based on the locked/unlocked state. When locked, the movable portion approaches the guiding portion to eliminate gaps caused by dimensional errors and prevent rattling. When unlocked, the movable portion separates from the guiding portion, allowing dimensional errors to exist without generating excessive elastic force or resistance. This dynamic behavior compensates for manufacturing precision errors.
3Stability of the object's composition
If the plastic projection is constantly pressed against the lower rail, then rattling is prevented, but operation for moving the upper rail is hampered
Solution Approach 1:
The movable portion dynamically changes its position based on the locked/unlocked state to optimize both stability and ease of operation. In the locked state, the movable portion approaches the guiding portion to prevent rattling. In the unlocked state, the movable portion separates from the guiding portion, significantly reducing friction and making it easy to move the upper rail. This dynamic adjustment resolves the contradiction between preventing rattling and ensuring ease of operation.
4Manufacturing precision
If dimensional accuracy errors exist between upper rail and lower rail, then manufacturing is easier, but the plastic projection contacts or separates from the lower rail causing rattling when locked
Solution Approach 1:
The movable portion dynamically adjusts its position relative to the guiding portion based on the locked/unlocked state. When locked, the movable portion approaches the guiding portion to eliminate gaps caused by dimensional errors and prevent rattling. When unlocked, the movable portion separates from the guiding portion, allowing dimensional errors to exist without affecting performance. This dynamic adjustment allows easier manufacturing while maintaining stability when locked.
Data Source
AI summary
A seat slide device is switchable between a locked state and an unlocked state. When the seat slide device in the locked state, a lock member attached to an upper rail is engaged with a lock hole formed in a lower rail. This restricts movement of the upper rail with respect to the lower rail. When the seat slide device is in the unlocked state, the lock member is separated from the lock hole to permit the upper rail to move with respect to the lower rail. In the unlocked state, a gap is formed between a movable portion and the lower rail. In contrast, in the locked state, the movable portion contacts the lower rail and the gap between the movable portion and the lower rail is eliminated.