Vehicle Seat Longitudinal Adjuster Spindle Holder Crash Resistance
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Solution Overview
Problem
Existing longitudinal adjusters for vehicle seats lack effective integration with the vehicle structure, particularly in terms of tensile load management and crash resistance, and require improved fastening mechanisms.
Innovation Solution
A longitudinal adjuster with spindle holders arranged externally and internally on the rails, featuring sheet metal bent components with hook-like protrusions for secure attachment to the vehicle structure, enhanced by additional support brackets for improved tensile load management and crash resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle holder is arranged from the outside on the rail, then the fastening to the vehicle structure is simplified and crash resistance is improved, but the device complexity increases due to additional external mounting requirements
Solution Approach 1:
The spindle holder is divided into distinct functional areas: a first area for external attachment to the vehicle structure and a second area for internal connection to the rail. This segmentation allows each area to be optimized independently - the external area provides crash resistance while the internal area maintains compact integration.
Solution Approach 2:
The spindle holder extends in multiple spatial dimensions: outwardly from the rail for vehicle structure attachment, and inwardly into the hollow space for spindle connection. This multi-dimensional arrangement enables simultaneous achievement of external fastening and internal integration without increasing overall device complexity.
2Ease of manufacture
If sheet metal bent components with hook-like protrusions are used, then the manufacturing simplicity and material versatility are improved, but the tensile load management requires additional support structures
Solution Approach 1:
The sheet metal bent component is segmented into a main body and separate support brackets. The main body provides the hook-like protrusion for simple attachment, while the support brackets are added specifically to enhance tensile load capacity, allowing each element to be optimized for its specific function.
Solution Approach 2:
The support brackets are merged with the sheet metal bent component to form an integrated assembly. This combination maintains the manufacturing simplicity of the sheet metal component while adding the tensile load management capability of the brackets, achieving both ease of manufacture and sufficient strength.
3Stability of the object's composition
If the spindle holder extends into the hollow space with a bracket, then the structural stability is improved, but the space occupation within the rail increases
Solution Approach 1:
The bracket extends into the hollow space only locally at the specific position where spindle support is required, rather than occupying the entire hollow space. This localized extension provides the necessary structural stability for spindle mounting while minimizing the volume occupied within the rail.
Solution Approach 2:
The bracket extends partially into the hollow space - just enough to provide adequate spindle support and structural stability, but not excessively. This partial action achieves the required stability while maintaining efficient use of the available hollow space.
Data Source
AI summary
A longitudinal adjuster for a vehicle seat (1) with a spindle (13), which is arranged in a hollow space formed by a pair of rails (5, 7), and with spindle holders (15). The area of connection of at least one of the spindle holders (15a) to one of the rails (5) lies outside of the hollow space formed by the rails (5, 7). The spindle holder (15a) extends with a partial area, with which it is connected to an end (13a) of the spindle (13), into the hollow space.