Seat position adjustment apparatus for vehicle

A seat position adjustment apparatus for a vehicle, provided with a cushion frame and a back frame rotatably mounted to the cushion frame, wherein the apparatus comprises:

• fixed rails fixed on a bottom plane;
• first sliding rails configured to slide in forward and backward directions on the fixed rails respectively;
• cushion links having a first end pivotally connected to the first sliding rails and a second end pivotally connected to the cushion frame;
• second sliding rails slidably mounted on the first sliding rails and configured to move together with the first sliding rails and slide on and protrude from the first sliding rails and formed to support the cushion frame;
• a driving device mounted to the first sliding rails or the second sliding rails and configured to transmit power to the first sliding rails and the second sliding rails;
• and
• a seat back link rotatably mounted on the bottom plane or the fixed rails and rotatably coupled to a seat hack frame to support the seat back frame,
• wherein the fixed rails, the first sliding rails, and the second sliding rails are slidably coupled to each other.