Pre-assembled blade for fans for cooling the coolant in machines/vehicles and fan provided with said blade

A cooling fan (10) for cooling the coolant contained inside a radiator (1) of operating machines and/or vehicles, comprising:

• one or more blade assemblies (20);
• and
• a hub (111) of the cooling fan (10) that can be rotationally operated about an axis (X-X) thereof and is realized as a single body with an internal axial through-seat (111a) and radial extensions (112),
• wherein at least one of said blade assemblies (20) is rotatable about an axis perpendicular to the axis (X-X) of rotation of the hub (111), the at least one blade assembly comprising:
• a blade body (20a) rigidly connected to an axial shank (21), wherein the shank (21) has a part axially on the outside of the blade body in the form of a cylindrical pin (21b), and holes (21c) with a female thread formed inside the pin cylindrical (21b);
• a blade flange (22) having a hollow cylindrical body (22a), the opposite end bases of which comprise respectively:
• a flat edge (22b) provided with through-holes (22c) connectable to the hub of the cooling fan, and
• an inset annular seat (22d);
• a disk (23) provided with through-holes (23a) and an eccentric recess (23d) for stably containing with a friction an eccentric pin (24), the eccentric pin rotationally actuating the blade body about its axis;
• screws (25), each screw designed to pass through a respective through-hole (23a) of the disk (23) and mate with the female thread of a respective hole (21c) in the cylindrical pin (21b) in order to fix relative to each other the disk (23), the blade flange (22), and the cylindrical pin (21b), thereby ensuring a definite angular alignment of the blade body (20a) relative to the eccentric pin (24),
• wherein said radial extensions (112) of the hub have a substantially parallelepiped shape having an internal cylindrical hole (112a) suitable for coaxial engagement with the shank of the blade assembly (20) and for connection to the blade flange (22), and
• wherein said radial extensions (112) of the hub (111) also have holes (112c) with a female thread for mating with screws (123) in order to fix the blade flange (22) of the blade assembly (20).