| 摘要 |
PURPOSE: To increase the air flow velocity from a rear end blowout port by branching the front part of a ventilation duct to a vertically forked form, and opening its front end air intake port toward the front of a body so as to face a fairing surface. CONSTITUTION: The front part of a lower ventilation duct 26 to be integrated into a fairing is vertically branched to provide an upper branch cylinder 27 and a lower branch cylinder 29. Thus, two air intake ports 28, 30 can be formed to catch a running wind through them. Therefore, even if the opening are of each intake port can not be extended in the structure of the fairing, the substantial air intake area of the lower ventilation duct 26 can be increased. Consequently, the air having a high flow velocity can be taken out from a first air blowout port 32 and a second air blowout port 33. When a cutoff valve 36 is closed, particularly, a higher air velocity can be provided from the air blowout port 32. |
