Expansion wheel for automobile

The utility model discloses an expansion wheel for an automobile. The expansion wheel comprises center shafts, abrasion-relieving inner sleeves, bearings arranged on eccentric shafts in a sleeving mode and outer sleeves. Positioning bodies are fixed to the left ends of the center shafts, torsion springs are arranged between the positioning bodies and the eccentric shafts in a sleeving mode, the edges of the right ends of the abrasion-relieving inner sleeves are bent outwards to form strengthening edges in contact with the right end faces of the eccentric shafts, the edges of the right ends of the eccentric shafts are bent outwards to form clamping edges, and damping gaskets are arranged between the strengthening edges and the clamping edges. The bearing rings comprise outer rings, inner rings, balls and holding frames. Strengthening protruding rings in a sawtooth shape are formed on the outer walls of the left ends and the outer walls of the right ends of the outer rings, and strengthening grooves matched with the strengthening protruding rings are formed in the inner walls of the outer sleeves. Circular arc grooves containing the balls are formed in the surfaces of the outer rings and the surfaces of the inner rings, V-shaped grooves are formed in the bottoms of the circular arc grooves in a downwards-concave mode, the surface of each circular arc groove is wrapped by an abrasion-relieving layer, and the surface of each V-shaped groove is wrapped by an abrasion-relieving layer. The vibration of the expansion wheel can be relieved through the strengthening edges, the clamping edges and the damping gaskets, and the use stability and firmness are improved. Due to the V-shaped grooves, the pressure-resisting capability of the bearings can be enhanced, and the abrasion of the balls can be relieved due to the abrasion-relieving layers.