The utility model relates to a take leaf spring rings of convex shoulder structure bush, its characterized in that: the round pin axle arranges in the shaft hole of leaf spring rings that leaf spring overlaps the intermediate position at the round pin axle, and it has the leaf spring neck bush to overlap between round pin axle and the leaf spring, and a round pin axle left end cover has left bush, and round pin axle right -hand member cover has right lining, and fastening bolt and nut cooperation canceling axle clamp that the leaf spring rings pass through the bottom are tight. It eliminates the friction between leaf spring and the leaf spring rings through increased the convex shoulder structure that is similar to the gasket between leaf spring rings and leaf spring.