Architecture of a turbomachine with counter-rotating turbine

A turbomachine with counter-rotating fans extending about an axis of rotation and comprising a fan section which includes a first row of fan blades which is connected to an upstream end of a first low-pressure shaft, and a second row of fan blades spaced axially downstream of the first row of fan blades and which is connected to an upstream end of a second low-pressure shaft disposed radially outwardly of the first low-pressure shaft, the first row of fan blades and the second row of fan blades rotating in opposite directions, the turbomachine further comprising a counter-rotating turbine driving the first and second rows of fan blades, the counter-rotating turbine of the turbomachine comprising:

• an inner rotor configured to rotate about the axis of rotation, and comprising at least one inner moving blade rotatably supported by the second low-pressure shaft;
• and
• an outer rotor configured to rotate about the axis of rotation in an opposite direction to the inner rotor, and comprising at least one outer moving blade rotatably supported only at a downstream end of the outer rotor by the first low-pressure shaft coaxial with the second low-pressure shaft, the first and second low-pressure shafts extending axially from upstream to downstream of the turbine,
• wherein the second low-pressure shaft is guided in rotation by a first bearing disposed between the second low-pressure shaft and an upstream casing of the turbine, and the first low-pressure shaft is guided in rotation by a second bearing disposed between the second low-pressure shaft and the first low-pressure shaft, the first bearing and the second bearing being disposed on a same radial plane normal to the axis of rotation, upstream of a first stage of the inner rotor,
• wherein the turbomachine further comprising an outer casing extending axially from the upstream end of the outer rotor over a length of not more than 50% of a length of the outer rotor.