Patent ID: 6807954
Filing Date: 2004-10-26
Classification: F02B

Abstract:
A portable power working machine, comprising a small air-cooled internal combustion engine mounted inside a main housing; a cooling fan disposed on one side of said main housing and driven by said internal combustion engine; a carburetor coupled to an upper portion of an intake port of said internal combustion engine; a clean air chamber disposed on an upstream side of said carburetor; an air cleaner cover coupled to said clean air chamber; a warm air introducing passageway for introducing interior to said air cleaner cover, through a region adjacent to said intake port, some of the air sucked by said cooling fan and used for cooling said internal combustion engine; and a shutter for externally opening or closing said warm air introducing passageway as desiredwherein an inlet port for said warm air introducing passageway is provided adjacent to said intake port disposed at a cooling air guide cover enclosing a cylinder portion of said internal combustion engine, and said shutter is disposed to open and close said inlet port.