"Axial Fan" is used to install the blade hub and blade adjustment mechanism, conical, cylindrical and spherical three. Spherical hub can be at any angle of the blade with a fixed gap with the hub, in order to reduce the leakage loss of fluid flow through the gap. A torque transmitting shaft member. "Axial Fan" according to whether the intermediate shaft is divided into two forms: one is no intermediate shaft type spindle motor shaft coupling directly connected; the other is a spindle with two couplings and an intermediate shaft the motor shaft is connected to an intermediate shaft type. After the "Axial Fan" intermediate shaft from the fan can start hanging in the cabinet cover, without removing the coupling under the circumstances connected with the motor rotor hanging out for easy maintenance.