Vehicle Seat Adjuster Track Roller Binding
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Solution Overview
Problem
The existing adjuster track assembly for vehicle seats experiences high rotational efforts and binding of rollers due to debris accumulation from the break-in cycle, leading to increased scrap, rejected parts, and downtime at the assembly line, as well as quality issues related to corrosion and abrasion.
Innovation Solution
Incorporating absorption areas within the bearing cage geometry, such as recesses or cavities, to facilitate the free flow and exit of wear debris and paint particles, preventing roller binding and reducing operational efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper and lower rails are mated to form the rail kit and undergo a break-in cycle, then proper distribution of grease throughout all moving components is ensured, but paint particles and shavings get lodged as debris into the roller pockets causing increased rotational efforts and complete binding of the rollers
Solution Approach 1:
The roller pocket is segmented into two functional zones: a retention area with concaved valleys for guiding and retaining rollers, and an absorption area with recesses for collecting debris. This segmentation allows the pocket to simultaneously perform roller retention and debris absorption functions, preventing binding while maintaining proper grease distribution during the break-in cycle.
Solution Approach 2:
The absorption areas with recesses convert the harmful effect of debris accumulation into a beneficial function by providing dedicated spaces for debris collection. Instead of allowing debris to bind the rollers, the recesses capture paint particles and shavings generated during the break-in cycle, transforming the harmful debris into contained material that does not interfere with roller operation.
2Ease of operation
If the rollers are retained between side walls of the roller pockets, then the rollers are guided in the cross-car direction, but debris accumulation causes increased rotational efforts and binding
Solution Approach 1:
The roller pocket is divided into a retention area with side walls for guiding rollers in the cross-car direction, and an absorption area with recesses for debris collection. This segmentation maintains effective roller guidance while providing separate spaces for debris accumulation, preventing the increase in rotational efforts that would otherwise occur due to debris binding.
3Adaptability or versatility
If the bearing cages are designed to allow movement within a defined track effort range, then the adjuster track assembly functions properly, but debris from the break-in cycle leads to high track efforts and quality issues
Solution Approach 1:
The absorption areas with recesses transform the harmful debris generated during the break-in cycle into a contained element. By providing dedicated spaces for paint particles and shavings, the design prevents debris from increasing track efforts and causing quality issues, while maintaining the adaptability of the bearing cages to allow proper movement within the defined track effort range.
Solution Approach 2:
The roller pockets are pre-designed with absorption areas and recesses before the break-in cycle occurs. This preliminary design ensures that when debris is generated during the break-in cycle, it is immediately captured in the pre-positioned recesses, preventing subsequent increases in track efforts and quality problems.
Data Source
AI summary
An adjuster track assembly for a vehicle seat includes an upper rail configured to be fastened to the vehicle seat and displaceable in a longitudinal direction, a stationary lower rail, a linear guide provided in the longitudinal direction between the upper rail and the lower rail which includes a bearing element for longitudinal guidance and support of the upper rail. The bearing element includes bearing cages with rollers accommodated within roller pockets having retention areas for guiding said rollers both in the longitudinal direction and the direction perpendicular to the longitudinal direction, and absorption areas for receiving or eliminating wear debris or abrasions.