Vehicle seat adjuster

A seat adjuster for a vehicle seat assembly, comprising:

• at least one track assembly including a lower track and an upper track, said upper track being mounted on said lower track and adapted for horizontal for-and-aft movement relative to said lower track;
• each of said tracks having an elongated bearing surface having first and second sides;
• bearing means interposed between said upper and lower tracks of said track assembly, said bearing means including at least one generally cylindrical roller bearing extending transversely of and engaging said bearing surfaces of said upper and lower tracks between the first and second sides of said bearing surfaces;
• the bearing surface of at least one of said upper and lower tracks being crowned between said first and second sides to provide a convex bearing surface for said one track, whereby in the absence of a load, said convex bearing surface bows outwardly between said first and second sides toward said roller bearing so that said roller bearing engages only a portion of said convex bearing surface intermediate said first and second sides, and when the load is coupled to a said convex bearing surface, said convex bearing surface deflects away from said roller bearing surface and becomes nearly flat from side to side so that said roller bearing contacts said convex bearing surface over substantially the entire width of the bearing surface, thereby providing a substantially even distribution of the load across the width of said one track;
• and a multi-layer dry film lubricant coating on at least one of said bearing surfaces, said dry film lubricant coating including a base coating of a mixture of solid lubricants dispersed in an organic binder and solvents and a top coating of a material from the group consisting of paraffin, polyethylene and polytetrafluoroethylene.