Ratchet wheel type expander structure

The utility model relates to the technical field of automobile brakes, in particular to a ratchet wheel type expander structure which comprises an expander body, an expansion cavity is arranged in the expander body, and piston cavities horizontally extending out of the expander body are arranged on the two sides of the expansion cavity in the expander body. The expansion cavity is formed in the expander body, the piston cavities are formed in the left side and the right side of the expansion cavity, when the push rod moves downwards, the pin rollers are extruded, the pin rollers extrude the piston barrels arranged in the piston cavities, and due to the fact that the pressed inclined faces are arranged at the inner ends of the piston barrels, when the piston barrels are pressed, the piston barrels move outwards, expansion of the brake is achieved, and the service life of the brake is prolonged. The ratchet wheel and the clockwork spring are sequentially arranged at the inner end of the inserting cylinder, the