Vehicle Seat Longitudinal Adjuster for Tolerance Compensation
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Solution Overview
Problem
Existing longitudinal adjusters for vehicle seats lack effective tolerance compensation, leading to potential misalignment and operational inefficiencies.
Innovation Solution
A longitudinal adjuster design featuring a U-shaped gear holder with horizontal recesses and a gear housing that projects into these recesses, allowing for additional construction space and tolerance compensation, enabling precise adjustment and reduced contact noise through the use of buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gear holder is designed without horizontal recesses, then the structure is simpler, but tolerance compensation is insufficient leading to misalignment
Solution Approach 1:
The gear holder incorporates horizontal recesses that extend into the base, creating additional spatial dimensions for tolerance accommodation. These recesses allow the gear housing to be positioned with lateral offset from the central axis, providing a degree of freedom that compensates for manufacturing tolerances in the rail assembly without requiring complex adjustment mechanisms.
Solution Approach 2:
The horizontal recesses act as an intermediary structural feature between the gear holder and the gear housing. This intermediate element provides a buffer zone that absorbs dimensional variations and misalignments, allowing the gear housing to be mounted with acceptable tolerance deviations while maintaining proper functional alignment of the gear mechanism.
2Reliability
If the gear housing is mounted rigidly without recess accommodation, then assembly is simpler, but misalignment and contact noise increase
Solution Approach 1:
The gear holder's horizontal recesses create lateral spatial accommodation that allows the gear housing to be positioned with offset from the central axis. This dimensional freedom enables the gear housing to be mounted without precise alignment while still achieving proper functional alignment through the recess buffer zone, thereby improving reliability without significantly increasing assembly complexity.
3Object-affected harmful factors
If no buffers are used in the gear mechanism, then the structure is simpler, but contact noise increases
Solution Approach 1:
Buffers are integrated into the gear mechanism to provide preemptive cushioning against contact impacts between gear teeth and surrounding components. These buffers absorb shock and dampen vibrations before they can generate noise, thereby reducing contact noise while adding only minimal structural complexity to the overall gear assembly.
Data Source
AI summary
A longitudinal adjuster for a motor vehicle seat may have a first rail, a second rail, a spindle, and a gear. The gear may be fastened to the second rail by a substantially U-shaped gear holder, and the gear holder may have at least two limbs arranged opposite one another in the longitudinal direction. The gear holder may have at least one recess in a base connecting the two limbs, and a gear housing surrounding the gear projects at least in sections into the at least one recess. A motor vehicle seat may have the longitudinal adjuster for adjusting a seat longitudinal position.