| 摘要 |
PROBLEM TO BE SOLVED: To effectively cool a cylinder of an engine and an exhaust silencer without impairing the conventional air blasting performance, and to realize the reduction of noises in operation. SOLUTION: The cylinder 2 is cooled by the air A taken out of an air outlet 13 formed on a rear wall 12a of a fan case 12, the air A after cooling the cylinder 2 is guided to the circumference of an exhaust silencer 3 by a cylinder cover 5 and a silencer cover 6 to cool the exhaust silencer 3, and then the air is discharged to a rear part of the exhaust silencer 3.
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