Reduction gearbox for solar photovoltaic tracking

A reduction gearbox for solar photovoltaic tracking, comprising a housing, an end cover, a gear, and a worm, wherein a first limiting stopper is disposed on a top of the housing;

• a first pair of a first limiting protrusion and a second limiting protrusion are disposed on a first side of a gear ring of the gear;
• the first limiting stopper and the first pair of the first limiting protrusion and the second limiting protrusion disposed on the first side of the gear ring of the gear constitute a first hard limiting structure;
• an outer end surface of the first limiting protrusion and an outer end surface of the second limiting protrusion are far away from each other, and a sum θ1+θ2 of an included angle θ1 between the outer end surface of the first limiting protrusion and the outer end surface of the second limiting protrusion and a central angle θ2 of the first limiting stopper is less than or equal to 170°, wherein the central angle θ2 of the first limiting stopper is defined with an axis of the gear as a center, and is an included angle between two ends of the first limiting stopper relative to the axis of the gear;
• and a difference θ3-θ4 between a central angle θ3 of the gear ring of the gear and a central angle θ4 of the worm is greater than or equal to 180°, wherein the central angle θ3 of the gear ring of the gear is defined with the axis of the gear as the center, and is an included angle between two ends of the gear ring of the gear relative to the axis of the gear, and the central angle θ4 of the worm is defined with the axis of the gear as the center, and is an included angle between two ends of a worm tooth of the worm relative to the axis of the gear;
• wherein an included angle θ5 between two end surfaces of the first limiting stopper is 30° to 50°.

A reduction gearbox for solar photovoltaic tracking, comprising a housing, an end cover, a gear, and a worm, wherein a first limiting stopper is disposed on a top of the housing;

• a first pair of a first limiting protrusion and a second limiting protrusion are disposed on a first side of a gear ring of the gear;
• the first limiting stopper and the first pair of the first limiting protrusion and the second limiting protrusion disposed on the first side of the gear ring of the gear constitute a first hard limiting structure;
• an outer end surface of the first limiting protrusion and an outer end surface of the second limiting protrusion are far away from each other, and a sum θ1+θ2 of an included angle θ1 between the outer end surface of the first limiting protrusion and the outer end surface of the second limiting protrusion and a central angle θ2 of the first limiting stopper is less than or equal to 170°, wherein the central angle θ2 of the first limiting stopper is defined with an axis of the gear as a center, and is an included angle between two ends of the first limiting stopper relative to the axis of the gear;
• and a difference θ3-θ4 between a central angle θ3 of the gear ring of the gear and a central angle θ4 of the worm is greater than or equal to 180°, wherein the central angle θ3 of the gear ring of the gear is defined with the axis of the gear as the center, and is an included angle between two ends of the gear ring of the gear relative to the axis of the gear, and the central angle θ4 of the worm is defined with the axis of the gear as the center, and is an included angle between two ends of a worm tooth of the worm relative to the axis of the gear;
• an end portion of a second end of the gear ring is meshed with the worm when the outer end surface of the first limiting protrusion abuts against a first end of the first limiting stopper, wherein the second end of the gear ring is adjacent to the second limiting protrusion;
• and an end portion of a first end of the gear ring is meshed with the worm when the outer end surface of the second limiting protrusion abuts against a second end of the first limiting stopper, wherein the first end of the gear ring is adjacent to the first limiting protrusion, and
• an included angle θ6 between an end surface of the first end of the gear ring and the outer end surface of the first limiting protrusion is 65°;
• and an included angle θ7 between an end surface of the second end of the gear ring and the outer end surface of the second limiting protrusion is also 65°.