Seat for vehicle

1 . A seat for a vehicle, comprising:

a pair of seat rails coupled to the vehicle and spaced apart from each other in a left-right direction;

a left slider and a right slider that are disposed on the pair of seat rails, respectively, and that are configured to move back and forth along the pair of seat rails;

a left side frame and a right side frame that are connected to each other, wherein positions of the left and right side frames are configured to change with respect to the left and right sliders, respectively;

a first link unit comprising a plurality of first links that connect one of the left slider or the right slider to one of the left side frame or the right side frame, respectively, the first link unit being disposed at one of a front side or a rear side of the seat in a front-rear direction;

a second link unit comprising a plurality of second links that connect the other of the left slider or the right slider to the other of the left side frame or the right side frame, respectively, the second link unit being disposed at the other of the front side or the rear side of the seat in the front-rear direction; and

an interlocking link that connects the first link unit to the second link unit,

wherein the plurality of first links comprise a first link and a second link,

wherein the first link has:

a first end rotatably coupled to the one of the left side frame or the right side frame, and

a second end rotatably coupled to a first end of the second link, the first link being configured to rotate with respect to the second link, and

wherein a second end of the second link is rotatably coupled to one of the left and right sliders.

2 . The seat according to claim 1 , wherein each of the left slider and the right slider comprises:

a moving rail configured to move along one of the pair of seat rails, and

a bracket disposed at the moving rail, the bracket comprising a hinge portion that connects the first link unit to the second link unit.

3 . A seat for a vehicle, comprising:

a pair of seat rails coupled to the vehicle and spaced apart from each other in a left-right direction;

a left slider and a right slider that are disposed on the pair of seat rails, respectively, and that are configured to move back and forth along the pair of seat rails;

a left side frame and a right side frame that are connected to each other, wherein positions of the left and right side frames are configured to change with respect to the left and right sliders, respectively;

a first link unit comprising a plurality of first links that connect one of the left slider or the right slider to one of the left side frame or the right side frame, respectively, the first link unit being disposed at one of a front side or a rear side of the seat in a front-rear direction;

a second link unit comprising a plurality of second links that connect the other of the left slider or the right slider to the other of the left side frame or the right side frame, respectively, the second link unit being disposed at the other of the front side or the rear side of the seat in the front-rear direction;

an interlocking link that connects the first link unit to the second link unit; and

at least one cross bar that connects the left and right side frames to each other,

wherein the plurality of first links comprise a first link and a second link, and

wherein the plurality of second links comprise a third link and a fourth link.

4 . The seat according to claim 3 , wherein the first link unit further comprises a first driver configured to supply rotational force to the first link unit.

5 . The seat according to claim 4 , wherein the first driver is disposed at any one of the left and right side frames and connected to the first link.

6 . The seat according to claim 4 , wherein the first driver comprises:

a first driving motor; and

a first gearbox connected to a motor shaft of the first driving motor, the first gearbox comprising an output shaft that define an external spline, and

wherein the first link defines an internal spline at an end of the first link, the internal spline engaging with the external spline.

7 . The seat according to claim 6 , wherein the first driving motor is configured to operate the seat in a fold-and-dive mode and a relaxation mode.

8 . The seat according to claim 7 , wherein the first link is configured to, in the fold-and-dive mode, (i) rotate in a first direction around the output shaft by the rotational force from the first driving motor and (ii) move the one of the left side frame or the right side frame backward while lowering a front portion of the one of the left side frame or the right side frame, and

wherein the third link is configured to, based on a movement of the one of the left side frame or the right side frame in the fold-and-dive mode, (i) rotate in a second direction around a hinge point of the one of the left side frame or the right side frame and (ii) lower a rear portion of the one of the left side frame or the right side frame.

9 . The seat according to claim 8 , wherein the first link is configured to, in the relaxation mode, (i) rotate in the second direction around the output shaft in by the rotational force from the first driving motor and (ii) move the one of the left side frame or the right side frame backward while raising the front portion of the one of the left side frame or the right side frame, and

wherein the third link is configured to, based on a movement of the one of the left side frame or the right side frame in the relaxation mode, (i) rotate in the second direction around the hinge point of the one of the left side frame or the right side frame and (ii) lower the rear portion of the one of the left side frame or the right side frame.

10 . The seat according to claim 7 , wherein the fourth link is configured to, in the fold-and-dive mode or the relaxation mode, restrain the second link through the interlocking link.

11 . The seat according to claim 3 , wherein the second link unit further comprises a second driver configured to supply rotational force to the second link unit.

12 . The seat according to claim 11 , wherein the second driver is disposed at the fourth link and configured to rotate together with the fourth link based on rotation of the fourth link.

13 . The seat according to claim 11 , wherein the second driver comprises:

a second driving motor;

a second gearbox connected to a motor shaft of the second driving motor;

a connection shaft connected to the second gearbox; and

a pair of cores coupled to ends of the connection shaft, respectively, and

wherein the connection shaft is fixed to one end of the fourth link through one of the pair of cores.

14 . The seat according to claim 13 , wherein the second driving motor is configured to operate the seat in a tilt-up-and-walk-in mode.

15 . The seat according to claim 14 , wherein the fourth link is configured to, in the tilt-up-and-walk-in mode, (i) rotate in a first direction around the connection shaft by the rotational force from the second driving motor and (ii) move the other of the left side frame or the right side frame forward while raising a rear portion of the other of the left side frame or the right side frame, and

wherein the second link is configured to, based on a movement of the other of the left side frame or the right side frame in the tilt-up-and-walk-in mode, (i) rotate in the first direction around a hinge point of the other of the left slider or the right slider and (ii) lower a front portion of the other of the left side frame or the right side frame.

16 . The seat according to claim 15 , wherein the interlocking link is configured to, in the tilt-up-and-walk-in mode, interlock the fourth link and the second link to thereby allow the second link to rotate in the first direction.

17 . The seat according to claim 1 , wherein the plurality of second links comprise a third link and a fourth link,

wherein the third link has:

a first end rotatably coupled to the other of the left side frame or the right side frame,

a second end rotatably coupled to a first end of the fourth link, the third link being configured to rotate with respect to the fourth link, and

wherein a second end of the fourth link is rotatably coupled to the other of the left and right sliders.

18 . The seat according to claim 17 , wherein the interlocking link has (i) a first end rotatably coupled to the second link and (ii) a second end rotatably coupled to the fourth link.

19 . A seat for a vehicle, comprising:

a pair of seat rails coupled to the vehicle and spaced apart from each other in a left-right direction;

a left slider and a right slider configured to move back and forth along the pair of seat rails, respectively;

a left side frame and a right side frame that are connected to each other, wherein positions of the left and right side frames are configured to change with respect to the left and right sliders, respectively;

a first link unit comprising a first link and a second link that connect one of the left slider or the right slider to one of the left side frame or the right side frame, respectively, the first link unit being disposed at one of a front side or a rear side of the seat in a front-rear direction;

a second link unit comprising a third link and a fourth link that connect the other of the left slider or the right slider to the other of the left side frame or the right side frame, the second link unit being disposed at the other of the front side or the rear side of the seat in the front-rear direction; and

an interlocking link that connects the second link and the fourth link to each other,

wherein one of the left slider or the right slider, the second link, the first link, one of the left side frame or the right side frame, the third link, the fourth link, and the interlocking link are hinged to one another and define a seven-bar linkage mechanism.