Seat Track Locking Structure for Longitudinal Freeplay Reduction
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Solution Overview
Problem
Seat track assemblies in vehicles experience looseness and freeplay between latched seat rails, leading to objectionable noise and vibration due to inadequate engagement between the openings and latch assembly components.
Innovation Solution
A seat adjustment apparatus featuring a locking mechanism with rotatable locking portions that extend teeth into complementary openings in the rails, allowing for precise engagement and reduction of freeplay between the telescopically engaged seat rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional latch mechanisms with simple openings are used, then the device complexity is low, but longitudinal freeplay between rails occurs causing noise and vibration
Solution Approach 1:
The latch mechanism is divided into multiple teeth (typically 2-4 teeth per locking portion) that engage with corresponding openings in the rails. This segmentation allows the locking force to be distributed across multiple contact points, eliminating freeplay while maintaining manageable complexity through modular tooth design
Solution Approach 2:
The latch mechanism incorporates both rotational movement (for engagement/disengagement) and axial movement (for teeth alignment with openings). This multi-dimensional motion capability enables positive engagement without requiring overly complex single-plane mechanisms, resolving the contradiction between reliability and complexity
2Reliability
If the latch mechanism is designed for simple operation, then ease of operation is high, but freeplay reduction capability is insufficient
Solution Approach 1:
The locking portions are combined into a single integrated component that performs both locking and freeplay elimination functions simultaneously. The teeth on different locking portions work together to engage multiple openings, achieving superior engagement stability without requiring separate adjustment mechanisms or complex operating procedures
Solution Approach 2:
The latch mechanism automatically positions its teeth into the openings through the telescopic movement of the rails, eliminating the need for manual alignment or complex adjustment procedures. The design self-adjusts to eliminate freeplay simply by engaging the teeth with the openings during normal rail movement
Data Source
AI summary
A seat adjustment apparatus comprises a first rail (24) and a second rail (26) each having a plurality of openings that extend along a longitudinal axis, the openings being defined by spaced-apart locking surfaces. A locking mechanism having first (56) and second (58) locking portions is configured to engage the first and second rails. The first (56) and second (58) locking portions are selectively rotatable between a released position and a locked position. In the locked position, the first and second locking portions are configured for relative axial movement along the longitudinal axis such that the interaction of the first and second locking portions of the locking mechanism with the spaced-apart locking surfaces of the openings of the first and second rails attenuates longitudinal freeplay therebetween.