To realize an inside/outside air switching device capable of introducing the outside air, introducing a part of the inside air from an auxiliary inside air door by utilizing negative pressure of a blower and driving the auxiliary inside air door by saving power, in an outside air introducing mode.
This device is provided with an inside/outside air switching box 10 having a first inside air introduction port 11 and a second inside air introduction port 17 opened on the inside of a cabin and an outside air introduction port 12 opened within an engine room, a rotary door 13 for switching, opening and closing the first inside air introduction port 11 and the outside air introduction port 12, a blowing fan 22 for sucking the outside air and the inside air and the inside air auxiliary door 18 which is arranged within the inside/outside air switching box 10 and opens and closes the second inside air introduction port 17. The second inside air introduction port 17 is opened at a position for generating differential pressure between the port 17 and the inside of the cabin by the operation of the blowing fan 22. When the rotary door 13 is in the outside air introducing mode, the inside air auxiliary door 18 is driven by differential pressure between the door 13 and the inside of the cabin and a part of the inside air is introduced.
SATO YASUHIRO
KATO MITSUTOSHI
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