Vehicle Seat Rail Gap Prevention With Bearing Lock Control
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Solution Overview
Problem
Conventional seat rails experience irregular gaps and shaking due to manufacturing inconsistencies, leading to non-uniform quality and instability.
Innovation Solution
A gap prevention structure is introduced, featuring a gap prevention unit that includes an elastic moving part and a fixed operating unit, which limits the rotation of the rolling bearing when locked and allows it to freely move when unlocked, thereby eliminating irregular gaps between the lower and upper rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a locking device is used to fix the upper rail position, then the seat rail position stability is improved, but irregular gaps appear between the lower rail and upper rail causing shaking
Solution Approach 1:
A gap prevention unit is introduced as an intermediary component between the lower rail and upper rail. This unit includes a pressing member that applies continuous pressing force to eliminate gaps, and a limiting member that restricts the relative movement between rails. The intermediary device mediates the connection between rails to prevent shaking while maintaining position stability.
Solution Approach 2:
The gap prevention unit applies preliminary anti-action by continuously pressing the upper rail against the lower rail to prevent gap formation before shaking can occur. The pressing member maintains constant contact force to counteract any tendency for gaps to develop during operation.
2Reliability
If the rolling bearing is constrained to prevent rotation, then gap prevention is improved, but the seat rail cannot slide smoothly
Solution Approach 1:
The system dynamically adjusts the constraint on the rolling bearing based on operational state. During sliding operation, the bearing is free to rotate and roll smoothly. When locking is required, the limiting member engages to prevent rotation and eliminate gaps. This dynamic switching between free rotation and constrained states resolves the contradiction.
Solution Approach 2:
The rolling bearing experiences periodic states of free rotation during sliding and constrained rotation during locking. The system alternates between these two states as needed, with the limiting member engaging and disengaging periodically to provide gap prevention only when necessary while maintaining sliding smoothness during movement.
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 structure effectively removes irregular gaps and stabilizes the seat rail by selectively controlling the rotation of the rolling bearing, ensuring uniform quality and reducing shaking.
Implementation Method 1
an elastic moving part configured to elastically move in the longitudinal direction of the lower rail by an elastic force of a first spring
Implementation Method 2
a fixed operating unit configured to have at least a portion thereof disposed in the receiving space and to press the rolling bearing by an elastic restoring force of the elastic moving part
Implementation Method 3
a rolling bearing configured to be rotatably coupled to the upper rail and to roll and move in the receiving space in the longitudinal direction of the lower rail
Data Source
AI summary
The present disclosure relates to a gap prevention structure of a seat rail for a vehicle. The gap prevention structure includes: a lower rail configured to be fixed to a bottom of a vehicle body and to have a receiving space formed therein; an upper rail configured to have at least a portion thereof received in the receiving space and to slide in a longitudinal direction of the lower rail; a rolling bearing configured to be rotatably coupled to the upper rail and to roll and move in the receiving space in the longitudinal direction of the lower rail; and a gap prevention unit configured to limit rotation of the rolling bearing by pressing the rolling bearing while being inserted between the lower rail and the rolling bearing.