SHAFT ASSEMBLY, APPARATUS FOR SHADING WINDOW AND APPARATUS FOR LUGGAGE SCREEN OF AUTOMOBILE HAVING SHAFT ASSEMBLY

The shaft assembly according to an embodiment of the present disclosure includes: a shaft connected to a blind sheet; a pair of end caps each being coupled to one side and the other side of the shaft to perform the rotational movement together with the shaft; a gear unit connected to either one of the pair of end caps and has a plurality of gears to interlock with the rotational movement of the shaft; and an elastic unit connected to any one of the plurality of gears of the gear unit and providing an elastic force so that the gear unit provides a rotational driving force to the shaft between a deployed position and a retracted position of the blind sheet.