Abstract: A reduction gearbox for solar photovoltaic tracking includes a housing, an end cover, a gear, and a worm. A first limiting stopper is disposed on the top of the housing. A first limiting protrusion and a second limiting protrusion are disposed on a side of a gear ring of the gear, and the first limiting stopper, the first limiting protrusion and the second limiting protrusion define a hard limiting structure. The sum of an included angle between outer end surfaces of the first and second limiting protrusions and a central angle of the first limiting stopper is less than or equal to 170°. The difference between a central angle of the gear ring of the gear and a central angle of the worm is greater than or equal to 180°.

Abstract: A reduction gearbox for solar photovoltaic tracking is provided. A sum of an included angle between an outer end surface of a first limiting protrusion and an outer end surface of a second limiting protrusion and a central angle of a limiting stopper is less than or equal to 170°, that is, an angle at which a gear rotates from a hard limiting position of the first limiting protrusion and the limiting stopper to a hard limiting position of the second limiting protrusion and the limiting stopper is greater than or equal to 190°. A difference between a central angle of a gear ring of the gear and a central angle of a worm is greater than or equal to 180°. A photovoltaic panel may be rotated to be perpendicular to the ground, so that snow accumulated on a photovoltaic panel surface can be cleared to the utmost extent.