Patent ID: 7484437

Claim:
A transmission unit for driving screw feeders and auxiliary user devices of mixing trucks, comprising: an off-center distribution device, which can be associated with an external power take-off and forms couplings for connection of auxiliary user devices; a reduction unit constituted by a first epicyclic reduction unit with at least one stage, which is functionally connected to said off-center distribution device and can be associated with screw feeders of a mixing truck; a main friction clutch device, which is interposed between said off-center distribution device and said reduction unit; a reversing device for reversing a direction of rotation of said screw feeders; and an auxiliary friction clutch device for said reversing device, wherein said main friction clutch device comprises: a clutch bell, which is keyed to a shaft of an input sun gear of said first epicyclic reduction unit and with which driven disks are associated for joint rotation therewith; and hub, which is keyed on a driven shaft of said off-center distribution device and with which driving disks interposed between said driven disks are associated for joint rotation therewith, and wherein said reversing device comprises: a sun gear, which is formed on said driven shaft of the off-center distribution device; at least one planetary gear supported by a gear carrier which is rotatable mounted on said driven shaft; and a ring gear with internal teeth, which rotates jointly with said clutch bell and is coupled to said planetary gears.