The utility model relates to the technical field of double-layer waterproof rear axles, and discloses a double-layer waterproof rear axle which comprises a rear axle
assembly, two transmission assemblies and two wheel end assemblies, the two transmission assemblies are symmetrically connected to the two sides of the rear axle
assembly, and the two wheel end assemblies are arranged at the ends, away from the rear axle
assembly, of the corresponding transmission assemblies respectively. The rear axle assembly is used for outputting driving force, and the transmission assembly is used for effectively transmitting the driving force to the wheel end assembly, so that the electric tricycle is driven. According to the structure, the
brake hub and the
brake hub cover ingeniously construct a first-layer labyrinth type waterproof barrier,
water vapor entering is reduced, a second heavy oil sealing ring is additionally arranged between the first through holes formed in the half shaft and the axle shaft, a double-layer sealing
system with the synergistic effect is formed,
water vapor is thoroughly isolated, a rear axle assembly is prevented from being corroded by the
water vapor, and the service life of the rear axle assembly is prolonged. The problems of transmission part
corrosion, lubricating oil emulsification,
transmission system faults and the like caused by internal damp are avoided, and it is ensured that the interior of the rear axle is always in a dry and stable working state.