Patent ID: 7430992

Claim:
An engine-driven work machine connected to and driven by an engine, comprising: a duct member disposed around outer peripheries of the engine and the work machine to define a continuous cooling-air passage between the duct member and the outer peripheries; a cooling fan disposed in the cooling-air passage and which generates a flow of cooling air from one end of the cooling-air passage to the other end during operation of the engine; an intake box connected to one end of the cooling-air passage and having an air-intake port; a muffler box connected to the other end of the cooling-air passage, having an air-discharge port, and accommodating an exhaust muffler of the engine; and a sound-insulating housing connected between the intake box and the muffler box to surround the duct member in order to insulate sound emitted from the duct member, wherein the duct member is provided with a through-bore permitting leakage of the cooling air from the cooling-air passage toward the sound-insulating housing, and a bottom surface of the sound-insulating housing is provided with a ventilation bore defined therein for discharging the air leaked from the through-bore to the outside.