Vehicle Seat Longitudinal Adjuster With Tolerance-Compensating Spindle Nut

The patent combines the spindle nut with the second rail by integrating fixing means directly into the spindle nut structure. The fixing means include crash bolts that extend through the second rail and are secured within the spindle nut, effectively merging two separate components (spindle nut and rail fixation system) into a unified assembly that compensates for manufacturing tolerances while maintaining structural reliability.

The spindle nut is pre-configured with fixing means (crash bolts, shoulders, and securing structures) before assembly. This preliminary preparation ensures that when the spindle nut is installed on the second rail, the fixing mechanisms are already in place to compensate for manufacturing tolerances and prevent play, eliminating the need for additional adjustment or complex assembly procedures.

The fixation system is segmented into multiple functional elements: crash bolts for primary anchoring, shoulders for positioning and load distribution, and securing structures for final fixation. This segmentation allows each component to perform its specific function efficiently, improving durability under load while maintaining manufacturability through modular assembly of standardized parts.

The spindle nut incorporates localized strengthening features at critical stress points, such as reinforced shoulders and strategically positioned crash bolts. These local quality enhancements provide the necessary strength and durability under load without requiring the entire structure to be overly complex or heavily fortified, thus balancing strength requirements with ease of manufacture.