Zenithal rotation module for orienting solar panels

Zenithal rotation module for orienting solar panels comprising a structural casing (1) having annular configuration, a toothed crown (2) mounted inside the structural casing (1) whereon an endless screw (3) actuated by a motor (4) tangentially meshes, wherein the toothed crown (2) comprises a central annular protuberance (5) whereon the toothing has been made that meshes with the endless screw (3), and wherein the circular projections (6) of the body of the toothed crown (2) comprise a plurality of threaded holes (7) for connecting the horizontal shafts that support the solar panels for their zenithal orientation, characterized in that the zenithal rotation module comprises two circular rings (8), disposed one on each side of the central annular protuberance (5) of the toothed crown (2) on the cylindrical surfaces of the circular projections (6) of the body of the toothed crown (2), wherein between said circular rings (8) a plurality of ball bearings (9) are located in different raceways (10) of semicircular section respectively made in different cylindrical surfaces of the body of the toothed crown (2), close to the walls of the central annular protuberance (5), and in the inner cylindrical surface of the circular rings (8) which establish four points of contact for supporting the radial loads, wherein the ball bearings (9) are introduced in the respective raceways (10) through a duct (11) made in the body of the toothed crown (2), which starts in the inner cylindrical surface of the toothed crown (2) and which ends in the raceway channel (10) of the toothed crown (2), and the rings of which comprise a plurality of threaded holes (13) in their outer lateral surfaces for their fixing to the structural casing (1) of the rotation module.