High-reliability maintenance-free differential assembly

The invention discloses a high-reliability maintenance-free differential assembly, which relates to the technical field of automobiles and is characterized in that a planetary gear gasket is arranged between a planetary gear and the inner wall of a differential shell, a half axle gear gasket is arranged between a half axle gear and the inner wall of the differential shell, and a ring roller pin structure is arranged at the matching position of the planetary gear and a cross axle; the roller pin is axially limited through the baffle plate and the step structure of the planetary gear; a planetary gear adopts an integral carburizing and quenching process, and the inner surface of a planetary gear gasket adopts a low-friction rare metal permeation heat treatment process; the half axle gear adopts an integral carburizing and quenching process, and the inner surface of the half axle gear gasket adopts a low-friction rare metal permeation heat treatment process; a flange limiting structure A is arranged on the outer