Lead screw supporting structure

The utility model relates to machine tool accessories, in particular to a lead screw supporting structure. The lead screw supporting structure comprises a lead screw, a lead screw nut is arranged on the lead screw, the lead screw is supported on a lathe bed through a front bearing support and a rear bearing support, and two abreast bearings are arranged on the front bearing support. The lead screw supporting structure is characterized in that four bearings are arranged on the rear bearing support in an abreast mode, the adjacent end faces of the four bearings are provided with V-shaped grooves or bosses in a radial shape, and the adjacent end faces of the two bearings are in matching connection through the V-shaped grooves or bosses, so that the four bearings are connected to form a whole. The lead screw supporting structure improves coaxiality and rigidity of the rear supporting of the lead screw, locating is accurate during installation, axial deformation of a lead screw shaft is decreased, the rear support