A driving axle for a hybrid heavy vehicle, the axle comprising: - a power take-off configured to receive power from an internal combustion engine of said heavy vehicle; - power distribution means comprising two power outlets and configured to distribute the power received from said power take-off to said power outlets; - two axle shafts having respective first portions coupled to said power outlets to receive power from said power distribution means and respective second portions arranged to be coupled to respective wheel-hubs of said heavy vehicle and supply power to said wheel-hubs; characterized in that the axle further comprises: - two suspension arms for being coupled to a frame of said heavy vehicle; - two shafts carried by said suspension arm (15, 15') in a rotatable manner around an axis and having relative axial ends to be respectively connected to said wheel-hubs; and - two electric motors each having a stator portion, which is carried by one of said suspension arms in a fixed position with respect to the same one of said suspension arms, and a rotor portion, which is coupled to one of said shafts to drive the same one of said shafts in rotation around said axis; wherein said second portions are respectively coupled to said shafts to drive said shafts in rotation around said axis, the driving axle further comprising a transmission that couples one of said second portions to one of the corresponding said shafts, wherein one of said suspension arms comprises a first hollow portion that houses said transmission, and wherein at least a first arm of said suspension arms comprises a second hollow portion that houses, at least partially, a first motor of said motors. - a power take-off configured to receive power from an internal combustion engine of said heavy vehicle; - power distribution means comprising two power outlets and configured to distribute the power received from said power take-off to said power outlets; - two axle shafts having respective first portions coupled to said power outlets to receive power from said power distribution means and respective second portions arranged to be coupled to respective wheel-hubs of said heavy vehicle and supply power to said wheel-hubs; characterized in that the axle further comprises: - two suspension arms for being coupled to a frame of said heavy vehicle; - two shafts carried by said suspension arm (15, 15') in a rotatable manner around an axis and having relative axial ends to be respectively connected to said wheel-hubs; and - two electric motors each having a stator portion, which is carried by one of said suspension arms in a fixed position with respect to the same one of said suspension arms, and a rotor portion, which is coupled to one of said shafts to drive the same one of said shafts in rotation around said axis; - two suspension arms for being coupled to a frame of said heavy vehicle; - two shafts carried by said suspension arm (15, 15') in a rotatable manner around an axis and having relative axial ends to be respectively connected to said wheel-hubs; and - two electric motors each having a stator portion, which is carried by one of said suspension arms in a fixed position with respect to the same one of said suspension arms, and a rotor portion, which is coupled to one of said shafts to drive the same one of said shafts in rotation around said axis; wherein said second portions are respectively coupled to said shafts to drive said shafts in rotation around said axis, the driving axle further comprising a transmission that couples one of said second portions to one of the corresponding said shafts, wherein one of said suspension arms comprises a first hollow portion that houses said transmission, and wherein at least a first arm of said suspension arms comprises a second hollow portion that houses, at least partially, a first motor of said motors.