Patent ID: 7931100

Claim:
A trailer, comprising: an auxiliary part for an auxiliary drive, comprising a drum part, which on one free end is provided with a ring gear fitted on its outer circumference, and on the other free end is provided with a bottom having at least three bolt holes lying equally spaced on a pitch circle, said drum being provided with cooling air apertures between the two free ends; and a drive unit provided with gear teeth interacting the ring gear of the auxiliary part, the drive unit configured for connection to the wheel/hub of said trailer; a chassis; and an axle, said axle being provided with a brake system comprising brake drums and wheels provided on said axle, wherein said auxiliary drive is fitted over said brake drum, the internal diameter of said auxiliary part being greater than the external diameter of said brake drum, the pitch circle of the at least three bolt holes corresponds to the pattern of the holes/bolts of said brake drum.