Second-generation lightweight double-bearing heavy-load automobile hub unit

The utility model relates to the technical field of automobile hubs, in particular to a second-generation light-weight double-bearing heavy-load automobile hub unit which comprises an outer ring assembly part and is characterized in that the inner portion of the outer ring assembly part is of a hollow structure, the wall thickness of the outer ring assembly part is even, 4-8 reduction holes are formed in an outer disc of the outer ring assembly part, and the number of the reduction holes is 4-8. A double-bearing assembly is arranged in the outer ring assembly part, the double-bearing assembly comprises an outer side bearing part, an inner side bearing part is arranged on one side of the outer side bearing part, and a dustproof sealing assembly is arranged on one side of the inner side bearing part. A plurality of reduction holes are formed in the outer disc of the outer ring assembly part, the requirement for light weight is met, the transmission efficiency is improved through the design of the double-bearing