Ratchet wheel type one-way belt pulley

The ratchet wheel type one-way belt pulley sequentially comprises a bearing inner ring, a ratchet wheel assembly, a bearing outer ring and a belt pulley body from the axis to the outside. The ratchet wheel assembly comprises a supporting frame, a plurality of special-shaped rollers are arranged in the supporting frame, all the special-shaped rollers are obliquely arranged in the supporting frame, the special-shaped rollers are kept to incline by a certain angle through the ratchet wheel middle ring, when the bearing inner ring rotates clockwise, the special-shaped rollers are promoted to abut against the bearing outer ring, and the larger the power is, the tighter the extrusion is. The outer ring of the bearing is pushed by the special-shaped pin roller to drive the belt pulley to rotate clockwise; if the mandrel rotates anticlockwise in the reverse direction, the inclination angle of the special-shaped pin roller can be increased by the bearing inner ring, the special-shaped pin roller is promoted to be sepa