Patent ID: 8758146

Claim:
A rotating system including a drive member and a driven member that rotate about an axis, the rotating system comprising: a coupling positioned to rotatably couple the drive member to the driven member; a housing surrounding a portion of the coupling to define an inside and an outside, the housing having a plurality of substantially identical outlet apertures each spaced a substantially equal distance from the axis and arranged to direct air out of the housing; a fan coupled to the coupling and operable to produce a flow of air from the inside to the outside; and a guide tube positioned within one of the plurality of outlet apertures to guide a flow of air produced by the fan from the outside to the inside, such that the guide tube converts the one of the plurality of outlet apertures into an inlet aperture such that cooling air flows into the inside of the housing through the outlet aperture that contains the flow tube, cools the coupling, and flows from the inside to the outside of the housing through each of the outlet apertures that do not contain the flow tube, wherein operation of the fan produces a low pressure region and wherein the guide tube includes a first end disposed within the low pressure region and a second end disposed adjacent the one of the plurality of outlet apertures.