Patent ID: 7049707

Claim:
An auxiliary power unit (APU) for a transport vehicle powered by an internal combustion engine, comprising: an enclosure for housing and supporting the auxiliary power unit on the transport vehicle; an air-cooled engine having an output shaft and enclosed within the enclosure with and directly driving an air-cooled, brushless generator having an armature shalt wherein the air-cooled engine utilizes fuel supply, exhaust and electrical systems of the transport vehicle engine and the generator provides direct, simultaneous AC and DC voltage outputs; and first and second air duct systems within the enclosure for separately conveying cooling air into and through the air-cooled engine and the generator respectively, to exit through first and second respective air outlet ducts from the enclosure, wherein cooling inlet air is drawn into the first and second air duct systems by respective direct drive fan means integrated respectively in the air-cooled engine and in the generator; wherein the enclosure comprises a frame and a plurality of rigid panels secured to the frame, wherein at least a first one of the plurality of rigid panels includes at least a first opening into a first inlet duct to the air-cooled engine; at least a second one of the plurality of rigid panels includes at least a second opening into a second inlet duct to the generator; and at least a third one of the plurality of rigid panels includes at least a first air outlet opening from a first outlet duct from the air-cooled engine and at least a second air outlet opening from a second outlet duct from the generator.