Odometer sensor ring gear and manufacturing method thereof

A purpose of the present invention is to provide an odometer sensor ring gear and a manufacturing method thereof. According to the odometer sensor ring gear, the inner round hole of a body has convexblocks and elastic rubber blocks so as to be conveniently installed; 64 signal teeth are arranged so as to improve grating precision by 8-32 times; the signal tooth forms an included angle A, and theedge of the left portion of the inner round hole outward forms an included angle and a recess so as to be well adapted to an odometer sensor; by arranging through hole groups, the advantages of weightreducing, ventilation, heat dissipation and good stability can be achieved; an oil inlet through groove for feeding lubricating oil is arranged, and the components of a formula comprise 1.0-5.0% of M7 steel, 0.5-1.2% of C, 1.0-3.0% of Cu, 0.1-2.0% of Ni, 0.3-1.0% of ZnSt, and the balance of Fe, such that the prepared signal ring gear has advantages of excellent performance and good strength; a powder metallurgy process com