Patent ID: 8033799

Claim:
A cooling fan unit comprising: an impeller including a plurality of blades arranged to rotate to generate an airflow; a motor arranged to rotate the impeller about an axial direction; a circuit board including components mounted thereon configuring a circuit to supply the motor with a drive current; a housing fixing thereto the motor and the circuit board and accommodating the impeller; and a plurality of lead wires connected to the circuit board and drawn out of the housing; wherein a hook groove which is arranged to secure the plurality of lead wires is defined in a wall of the housing so as to extend in a direction in which the plurality of lead wires are drawn out from the circuit board; the hook groove includes a lead wire through path in an axial top surface of the wall of the housing which extends or substantially extends longitudinally in the direction in which the plurality of lead wires are drawn out from the circuit board from an inner end surface to an outer end surface of the wall of the housing and a lead wire guide which extends substantially perpendicularly from an axially lower portion of the lead wire through path; at least two of the plurality of lead wires are arranged to cross with each other at a position between the hook groove and a connection portion of the circuit board with respect to the direction in which the plurality of lead wires are drawn out from the circuit board, so that at least one second lead wire of the at least two of the plurality of lead wires inhibits a displacement of a first lead wire of the at least two of the plurality of lead wires, which is aligned closest to the lead wire through path out of all of the plurality of lead wires accommodated in the lead wire guide, in a direction at which the first lead wire of the at least two of the plurality of lead wires becomes disengaged from the lead wire through path; and portions of the plurality of lead wires located at the position between the hook groove and the connection portion of the circuit board are arranged to overlap with the impeller in a radial direction such that substantially an entirety of the portions of the plurality of lead wires located at the position between the hook groove and the connection portion of the circuit board are exposed to the airflow generated by the impeller.