AUTOMOBILE AND SLIDING RAIL ASSEMBLY OF SEAT THEREOF

The invention discloses an automobile and a sliding rail assembly of a seat thereof. The sliding rail assembly is bilaterally symmetric, and comprises an upper sliding rail and a lower sliding rail extending along a back-and-forth direction as well as an upper ball and a lower ball disposed between the upper sliding rail and the lower sliding rail. The lower sliding rail comprises a horizontal base plate, a first vertical side plate connected to the upper portion at the left edge of the horizontal base plate, and a first horizontal top plate connected to the right side at the upper edge of the first vertical side plate; the upper sliding rail comprises a first inclined plate and a second inclined plate; the extension line of the first inclined plate intersects with the first vertical side plate and the extension line of the first horizontal top plate to form an upper triangular region; the upper ball is mounted in the upper triangular region and comes into point contact with the first inclined plate, the first vertical side plate and the first horizontal top plate; the extension line of the second inclined plate intersects with the horizontal base plate and the first vertical side plate to form a lower triangular region; the lower ball is mounted in the lower triangular region and comes into point contact with the second inclined plate, the horizontal base plate and the first vertical side plate. The sliding rail assembly solves the problem of shaking during seat adjustment, and has enough bearing capability.