Hub bearing unit assembly and vehicle applying same

The utility model discloses a hub bearing unit assembly and a vehicle applying the same, which comprises an outer ring, a first inner ring and a second inner ring are arranged in the outer ring, the inner side surfaces of the first inner ring and the second inner ring are arranged together, and the first inner ring and the second inner ring are connected together through a sealing snap ring. A first O-shaped ring and a spring clamping ring are jointly and fixedly arranged between the outer walls of the inner ends of the first inner ring and the second inner ring in a sleeving mode, the first O-shaped ring is located on the inner side of the spring clamping ring, a first retainer is fixedly arranged on the first inner ring in a sleeving mode, a second retainer is fixedly arranged on the second inner ring in a sleeving mode, and a plurality of evenly-distributed first rollers are arranged on the first retainer. The peripheries of the first rollers make contact with the inner wall of the outer ring and the outer