Automotive Rail Retention Latch for Structural Integrity
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Solution Overview
Problem
Typical rail assemblies for transposing seats in automotive vehicles are susceptible to deformation during upward loading, leading to potential separation of the moveable drive assembly from the fixed track, which can result in partial or complete separation and compromise the structural integrity.
Innovation Solution
A long rail assembly with a fixed rail having a U-shaped cross-section and a retention latch system that engages mating teeth on flanges to prevent lateral separation, allowing the rail drive assembly to move along the rail while maintaining structural integrity under load, featuring a retention latch operable between a loaded and use position to inhibit separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail assembly uses a simple U-shaped fixed track without retention latches, then the device complexity is reduced, but the reliability deteriorates due to susceptibility to deformation and separation under upward loading
Solution Approach 1:
The retention latch is designed to automatically engage with the mating teeth on the flange before upward loading occurs, pre-establishing the anti-deformation mechanism. The latch protrusion fits into the recess of the mating teeth in the normal position, so that when upward load is applied, the structural integrity is already protected rather than reacting after deformation begins
Solution Approach 2:
The retention latch acts as an intermediary component between the moveable drive assembly and the fixed track. The latch protrusion and mating teeth recess create a mechanical interface that transfers and distributes upward loads, preventing direct stress concentration on the U-shaped track structure and eliminating lateral separation between end portions
2Reliability
If the retention latch is engaged with mating teeth to prevent separation, then the reliability under load is improved, but the ease of operation deteriorates due to restricted movement of the rail drive assembly
Solution Approach 1:
The retention latch system is designed with dynamic characteristics that allow it to adapt between two states: engaged for reliability under load, and disengaged for ease of operation during movement. The latch can transition between these states based on operational requirements, providing both secure positioning and free movement capabilities
Solution Approach 2:
The retention latch provides localized engagement only at specific critical points where lateral separation would occur, rather than constraining the entire rail drive assembly. The mating teeth on the flange create discrete engagement points that prevent separation while allowing longitudinal movement when disengaged, providing targeted protection without overall restriction
Data Source
AI summary
A long rail assembly is attached to a floor within an automotive vehicle for transposing vehicle seats between a plurality of positions. The long rail assembly includes a rail drive assembly configured to travel along an interior cavity of a fixed long rail. The fixed long rail has a generally U-shaped cross-section and includes a pair of flanges with mating teeth extending inwardly from a pair of outer walls. The rail drive assembly includes a retention latch and a wheel assembly coupled adjacent a first and a second end of the rail drive assembly. The rail drive assembly is operable between a use position and a loaded position in which at least one of the retention latches engages the mating teeth to interlock the rail drive assembly and the fixed long rail in response to forces causing upward loading on the rail drive assembly.