| 摘要 |
PROBLEM TO BE SOLVED: To improve an operation efficiency by eliminating the need for the frequent maintenance of an air cleaner. SOLUTION: A portable type blast working machine has an internal combustion engine (20). in which the air cleaner (40) is arranged to a suction system, and a centrifugal type air blower (30) rotated by the engine (20). An inlet port (46) for sucking the outside air, a filter section (42) for purifying air sucked from the inlet port (46) and introducing it to a suction port (22) for the engine (20) and an outlet (47) for discharging a part of air sucked from the port (46) to the outside without the filter section (42) are installed to the cleaner (40). An air flow (A) towards the outlet (47) from the inlet port (46) is generated in the cleaner (40) by utilizing a suction negative pressure generated by a fan (31) for the blower (30). COPYRIGHT: (C)2005,JPO&NCIPI
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