Seat for autonomous driving vehicle

1. A seat posture adjustable structure for an autonomous driving vehicle, the seat posture adjustable structure comprising:

a cushion part;

a back part coupled to a rear end of the cushion part through a recliner and having an adjustable angle in a front and rear direction;

a seat rail;

a back rail; and

a leg part rotatably coupled to a front end of the cushion part and having a lower side coupled to the seat rail,

wherein the back part is disposed to be vertically movable along the back rail located on a rear side of the back part, and

wherein the leg part is disposed to be movable back and forth by the seat rail.

2. The seat posture adjustable structure according to claim 1 , further including a rail block,

wherein the back rail is disposed on a back panel located on the rear side of the back part to extend vertically, and

wherein the back rail is coupled to the rail block which is configured to move vertically along the back rail.

3. The seat posture adjustable structure according to claim 2 , further including a first hinge pin,

wherein the rail block and the back part are rotatably coupled through the first hinge pin.

4. The seat posture adjustable structure according to claim 1 , wherein the seat rail comprises:

a fixing rail fixedly disposed on a floor panel which is located on the lower side of the leg part, the fixing rail extending in the front and rear direction; and

a moving rail coupled to the fixing rail and configured to move along the fixing rail in the front and rear direction, and

wherein the lower side of the leg part is coupled to the moving rail.

5. The seat posture adjustable structure according to claim 1 , further comprising a second hinge pin and a hinge part extending from an upper side of the leg part, and

wherein, when the hinge part of the leg part is coupled through the second hinge pin while overlapping with the front end of the cushion part, the cushion part and the leg part are rotatably coupled.

6. The seat posture adjustable structure according to claim 1 , wherein the cushion part extends in the front and rear direction which is a longitudinal direction of the seat rail, the back part vertically extends slantly at a predetermined angle with the cushion part, and

wherein, when the leg part is disposed to vertically extend, the seat posture adjustable structure implements one of a general seating mode or a relax mode.

7. The seat posture adjustable structure according to claim 6 , wherein, when the seat posture adjustable structure is in the general seating mode, a forward slide movement distance of the leg part and a reclining angle of the back part are smaller compared to when the seat posture adjustable structure is in the relax mode.

8. The seat posture adjustable structure according to claim 6 , wherein, when the seat posture adjustable structure is in the relax mode, a forward slide movement distance of the leg part and a reclining angle of the back part are great greater compared to when the seat posture adjustable structure is in the general seating mode.

9. The seat posture adjustable structure according to claim 1 , wherein the cushion part and the back part linearly extend in the front and rear direction which is a longitudinal direction of the seat rail, and

wherein, when the leg part connected to the cushion part is disposed to vertically extend, the seat posture adjustable structure implements a bed mode.

10. The seat posture adjustable structure according to claim 2 , wherein, when the cushion part, the back part, and the leg part linearly extend in the vertical direction which is a longitudinal direction of the back rail and are disposed to be in close contact with the back panel, the seat posture adjustable structure implements a cargo loading mode capable of loading a cargo in an inner space of the vehicle.

11. The seat posture adjustable structure according to claim 1 , wherein the seat posture adjustable structure implements one of a general seating mode, a relax mode, a bed mode, or a cargo loading mode according to changes in a vertical slide movement distance of the back part, a reclining angle of the back part, and a forward and backward slide movement distance of the leg part.