Internal-combustion engines – Cooling – Air-cooled
Patent
1993-09-01
1994-09-06
Kamen, Noah P.
Internal-combustion engines
Cooling
Air-cooled
123198E, 55437, 55DIG14, 55DIG28, F01P 704
Patent
active
053438310
ABSTRACT:
A portable work producing apparatus, such as a chain saw, has an engine cooled by air from a blower driven by the engine. The engine's carburetor is pressurized with clean air from the blower. The blower includes a centrifugal impeller mounted within a fan housing having a set of blades for creating a vacuum to draw air into the housing. The impeller has a second set of relatively low-profile blades underneath the impeller for creating a vacuum under the impeller that draws air in through holes defined through the hub of the impeller. The air drawn through the holes is supplied to the carburetor. A circular screen extends from the axis of the impeller over the holes. Small particles entrained in the air stream entering the housing tend to be carried by the predominant portion of the stream into the housing. The screen is positioned and of a size that the trajectories of more massive particles entering the housing that are not blown into the housing bounce off the screen. Thus, the air delivered to the carburetor is relatively free from particles that would otherwise clog the air filter of the carburetor.
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Kamen Noah P.
WCI Outdoor Products, Inc.
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