| 摘要 |
PROBLEM TO BE SOLVED: To make the opening of a differential door in the foot mode an easily settable opening by providing a leakage opening leaking the hot air to the outside in the middle of a differential duct. SOLUTION: A leakage opening 5 is provided in the middle of a differential duct 2, the hot air fed into the differential duct 2 is leaked to the outside of the differential duct 2, and the hot air quantity leaked from the differential draft hole 4 is suppressed to about 10%, for example. The leakage opening 5 is provided on the differential duct 2 to blow out the hot air toward the differential duct 2, and the differential duct 2 is warmed by the hot air leaked from the leakage opening 5. Hot air is leaked from the leakage opening 5 to suppress the hot air leaked quantity from the differential draft hole 4, thus the openingθof the differential door 3 in the foot mode can be made an easily settable opening. The differential duct 2 is warmed by the hot air leaked from the leakage opening 5, thus the heat loss in the differential mode can be suppressed.
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