Motorcycle engine cooling apparatus

A cooling apparatus of an internal combustion engine of a water-cooled motor vehicle, wherein a cooling fan (6) is controlled by the driving shaft (2) faced to a radiator (4) which is protected by a louver (5) arranged on a side of the motor vehicle and receiving a substantially tangential air flow, deriving from the forward motion of the motor vehicle, said louver (5) having a lower fastening edge (51) and a top fastening edge (52), wherein:

• said louver (5) comprises at least a current rib (11) extending in a direction concurrent with a motion direction (F) of the motor vehicle, intermediate between said lower fastening edge (51) and a top fastening edge (52) and more spaced-apart with respect thereto from the radiator (4), having a C-like section with the concavity faced towards the radiator (4), so as to increase the height of the empty space comprised therebetween and the radiator (4) so as to determine between the louver (5) and radiator (4), a space deviating the motion of the air sucked by the fan (6);
• and
• said louver (5) comprises a plurality of blades (12, 13) extending on both sides of said current rib (11), transversal to the motion direction (F) of the motor vehicle, having a front leading edge (16) which is more spaced-apart from the radiator (4) than the respective rear edge (17),
• said at least a current rib (11) being substantially parallel to the plane defined by the surface of the radiator (4) faced thereto, so that the distance between them and said surface, defining said empty space (10), is constant if seen along the motion direction (F) defining the forward motion of the motor vehicle.