Transmission apparatus for a vehicle having at least two drivable axles

Vehicle transmission apparatus comprising first and second drivable axles, each drivable axle having two hydraulic motors, one on each side of the vehicle, the apparatus comprising two analogous closed transmission circuits, one for each side of the vehicle, each closed circuit having a hydraulic pump as well as a motor of the first axle and a motor of the second axle;

• wherein the hydraulic motors of the second axle are dual-capacity motors, each of which comprises two elementary motors, each elementary motor having first and second elementary connections, for feed or discharge purposes, the first elementary connections being in common to form a first main connection of the dual-capacity motor, while the second elementary connections are separate and form respectively a second main connection and a third main connection of the dual-capacity motor, each of the hydraulic motors of the first axle having at least first and second main connections, for feed or discharge purposes, wherein, in each closed circuit, the first main connection of the dual-capacity motor and the first main connection of the motor of the first axle are connected continuously to respective ones of the two ports of the pump of the circuit in question, and wherein each closed circuit further includes a selector having at least two positions, disposed on interconnection ducts between the pump, the second and third main connections of the dual-capacity motor and the second main connection of the motor of the first axle.