Vehicle seat slide device

1. A vehicle seat slide device comprising:

an upper rail that includes a bracket support having a pair of side walls and an upper wall connecting upper ends of the respective side walls;

a lower rail that supports the upper rail so as to be relatively movable; and

a bracket that is fixed to the bracket support,

wherein a cutout portion which is open upward is formed in the bracket support by cutting out the upper wall and the respective side walls,

wherein a nut member which is screwed to a bolt inserted into the bracket support via a terminal of the bracket support is disposed in the cutout portion,

wherein the bracket includes first and second vertical walls which have an insertion hole into which the bolt is inserted, and which oppose each other,

wherein the first vertical wall is fixed to the terminal of the bracket support, based on a fastening force of the bolt screwed into the nut member,

wherein the second vertical wall is arranged inside the cutout portion at a position where the nut member is interposed between the first vertical wall and the second vertical wall, and

wherein in the upper rail, a support which supports the bolt screwed into the nut member from below is disposed at a position farther away from the first vertical wall than the nut member.

2. The vehicle seat slide device according to claim 1 ,

wherein the terminal of the bracket support to which the first vertical wall is fixed is a rear end of the bracket support extending in a vehicle longitudinal direction.

3. The vehicle seat slide device according to claim 2 , further comprising:

a front bracket that is fixed to a front end side of the bracket support,

wherein the front bracket includes,

a third vertical wall which is fixed to the front end side of the bracket support, based on a fastening three of a second nut member which is fixed to the front end side of the bracket support and a second bolt fixedly screwed into the second nut member, and

a fourth vertical wall which has a contact portion with respect to an upper surface of the bracket support.

4. The vehicle seat slide device according to claim 1 ,

wherein the support is a shaft-shaped member which is laid between the side walls.

5. The vehicle seat slide device according to claim 1 ,

wherein the bracket supports a second upper rail and a second lower rail which have an upper wall connecting the first and second vertical walls, and which extend in a direction intersecting the extending direction of the upper rail and the lower rail above the upper wall;

a long hole extending in the extending direction of the second upper rail is disposed on the upper wall of the bracket; and

a load transfer member including a shaft having a shape which can pass through the long hole and whose one end side is fixed to the upper wall of the second upper rail, and a flange disposed on the other end side of the shaft and having a shape which cannot pass through the long hole arranged below the upper wall of the bracket is interposed between the bracket and the second upper rail.

6. The vehicle seat slide device according to claim 1 ,

wherein the nut member is welded to the bracket support at a position on a terminal side to which the first vertical wall is fixed inside the cutout portion.

7. The vehicle seat slide device according to claim 1 ,

wherein a plate-shaped member having an insertion hole into which the bolt is inserted is disposed in the terminal of the bracket support to which the first vertical wall is fixed.

8. The vehicle seat slide device according to claim 1 ,

wherein a cutout portion which has a flared shape of widening toward an opening side and which is open to a lower end is formed on the second vertical wall.