Patent ID: 7952241
Filing Date: 2011-05-31
Classification: H02K

Abstract:
1. A cooling fan which is attached to a rotor which includes a shaft, a rotor core attached to the shaft and including a plurality of windings provided thereon, and a commutator attached to the shaft, the cooling fan comprising: a fan ring having a first end surface to be fixed to the rotor core and a second end surface on an opposite side of said first end surface; and a plurality of fins connected to said second end surface of the fan ring, said fan ring having wire accommodation recesses on said first end surface, said wire accommodation recesses communicating with core slots of the rotor core, wherein the wire accommodation recesses are formed such that at least portions of the wire accommodation recesses face the corresponding core slots so as to receive corresponding portions of wires wound to form the windings, the portions being expanded to the outer circumferential edge of the core rotor, wherein the depth of the wire accommodation recesses as measured along a thrust direction is equal to or greater than the diameter of each of the wound wires, said fan ring having positioning leg portions provided on said first end surface thereof facing the thrust direction, said fan ring being positioned in relation to the rotor core through insertion of the positioning leg portions into the core slots of the rotor core, said wire accommodation recesses being formed on said first end surface of the fan ring facing the thrust direction.