HORIZONTAL ADJUSTMENT MECHANISM FOR SLIDE RAIL AND AUTOMOBILE SEAT FRONT ELECTRIC SLIDE RAIL

The invention provides a horizontal transmission assembly of a slide rail, and a front electric slide rail of an automobile seat. The horizontal transmission assembly is mounted in an upper rail assembly and a lower rail assembly of the slide rail; a split type retainer ring assembly and a semi-open rear bracket are mounted at a rear end of a screw rod; the split type retainer ring assembly includes a pair of mutually independent retainer rings; a convex ring extending axially is arranged on at least one end face of each of the retainer rings; the semi-open rear bracket is provided with an elastic clamping groove with a radial opening; and a rear end of the screw end is pressed and clamped into the elastic clamping groove from the radial opening. The retainer ring assembly of the invention adopts a split type design, which is convenient to take out the horizontal transmission assembly for rework; meanwhile, the semi-open rear bracket with a half opening makes the assembly simpler.