Patent ID: 7690460

Claim:
An exhaust structure of a construction machine, comprising: an engine guard forming an engine room in which an engine, a heat exchanger and a cooling fan are installed, the engine guard having an exhaust port; an exhaust duct for absorbing sound disposed in said engine room, the exhaust duct being constructed such that the air taken from the exterior into said engine room by said cooling fan passes around said heat exchanger and said engine and through said exhaust duct, and then is exhausted from said exhaust port to the exterior; a bonnet for opening and closing a maintenance port, and a fixed hood, the bonnet and the fixed hood forming an upper surface part of said engine guard; a movable duct disposed on the lower surface side of said bonnet, the movable duct being provided in a state that when said bonnet is opened, the movable duct is moved integrally with said bonnet so as to open said maintenance port; and a fixed duct disposed on the lower surface side of said fixed hood, the fixed duct being provided in a state that when said bonnet is closed, one end of the fixed duct is serially connected to one end of said movable duct in the air flow direction, wherein said exhaust duct is formed by said movable duct and said fixed duct.