Wear-resistant ball joint

A wear-resistant ball joint comprising a base cap, a ball stud pivotally disposed on said base cap, and a sealing ring, an elastic ring, and a positioning ring respectively disposed in said base cap;

• with said positioning ring placed in said base cap in position, said elastic ring situated above said positioning ring, and said sealing ring situated above said elastic ring, wherein said base cap includes an inner cap wall and an accommodation room enclosed by said inner cap wall, a bending portion being disposed on a peripheral edge of said base cap, said ball stud including a ball portion disposed within said accommodation room for being in contact with said inner cap wall and a shaft portion extended outwards from said ball portion and disposed outside of said accommodation room of said base cap, wherein said sealing ring, said elastic ring, and said positioning ring are sequentially placed into said accommodation room and pressed by said bending portion, thereby fixing said ball portion, said sealing ring, and said positioning ring in position, wherein said positioning ring, said elastic ring, and said sealing ring are confined in said accommodation room after said peripheral edge of said base cap is bent to form said bending portion whereby said ball stud is pivotally connected to said base cap;
• wherein a hardness of said positioning ring is greater than a hardness of said elastic ring, said positioning ring including a contact surface in contact with said inner cap wall and an engaging surface in contact with said elastic ring, wherein at least one engagement portion protrudes outwards from said engaging surface, each said engagement portion including a plurality of spaced-apart teeth units and a plurality of recessed areas, with crests of said plurality of teeth units being spaced apart from each other, each of said plurality of recessed areas being defined between every two adjacent teeth units, wherein said plurality of teeth units are embedded into said elastic ring when said elastic ring, said sealing ring, and said positioning ring are pressed by said bending portion, thus tightly engaging said positioning ring and said elastic ring with each other.