Long slide rail system for vehicle seat

A long slide rail system for a vehicle seat, the long slide rail system comprising:

• a lower rail configured to extend lengthwise along a floor panel of a vehicle, the lower rail configured to be fixedly installed on the floor panel;
• an upper rail coupled to the lower rail, the upper rail configured to enable a seat cushion to be slidably moved along the lower rail;
• a lock fork mounted on the upper rail, the upper rail being slidably movable based on the lock fork being unlocked from a locking hole formed on the lower rail;
• a rotation bracket coupled to the upper rail and configured to be rotated by the lock fork;
• and
• a clearance control module configured to maintain a vertical clearance and a horizontal clearance with respect to the lower rail, the clearance control module configured to selectively stop maintaining the vertical clearance and the horizontal clearance with respect to the lower rail so as to enable sliding movement of the upper rail based on the clearance control module being connected to the rotation bracket.