PROBLEM TO BE SOLVED: To prevent foreign matter or the like that is flipped-up at traveling from jumping into a motor from an exhaust port, to improve the discharging efficiency of exhaust air, and to reduce noise.;SOLUTION: Outside air is taken into a main motor body 3 from an outside air inlet port 31 by the rotation of a fan 15 fixed to a main shaft 11, the bottom of the main motor body 3 is opened for making the exhaust port 33 that discharges the taken-in air to the outside blow out the air toward the ground surface, and the opening is formed into a shape that opens in the fore-and-aft direction with respect to the traveling direction by a rectifying part 37 that is installed at the central region of the opening.;COPYRIGHT: (C)2006,JPO&NCIPI
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