Seat sliding device for vehicle

A seat sliding device for a vehicle, comprising

• an upper rail for supporting a seat and having downwardly depending first side portions spaced a first distance apart, narrowing to a neck portion having downwardly depending second side portions spaced a second distance apart, the second distance being less than the first distance, the second side portions ending in first end portions, the first side portions and the neck portion defining a first channel, the first channel being open at one end;
• a lower rail for securing to a floor of the vehicle, the lower rail including upwardly projecting side portions with second ends, the neck portion of the upper rail extending between the second ends, the first ends being interlocked with the second ends at an interlocked portion for slidable movement of the upper rail with respect to the lower rail, the side portions of the lower rail and the interlocked portion defining a second channel with the first channel positioned above the interlocked portion;
• a screw shaft, having opposite ends, located in the channel of the upper rail,
• a nut threadably connected to the screw shaft in the first channel intermediate the opposite ends and fixedly attached to the lower rail;
• a motor coupled to a first of the opposite ends of the screw shaft for rotating the shaft relative the nut;
• and
• a bearing member insertable through the open end of the first channel and slidable in the first channel to a position in engagement with and rotatably supporting the screw shaft at a second of the opposite ends, the bearing member having first external portions frictionally engaging the downwardly depending first side portions to fixedly position the bearing in the upper rail.