| 摘要 |
PROBLEM TO BE SOLVED: To provide a rear part structure of a box-type vehicle capable of satisfactorily reducing a travelling resistance.SOLUTION: A tubular bag body 50 which is extended along an upper edge 14b1 and both side edges 14b2 of a back surface 14b, and is expanded in such a way that the top is narrowed toward the rear side by filling compressed air into the inside to reduce air resistance on the back surface is expandably and shrinkably disposed on a rear surface 14b of a box-shape vehicle 10. The tubular bag body 50, when a travelling speed of a vehicle is a prescribed value or more, causes the compressed air to be introduced thereinto and is expanded and, when the travelling speed is less than the prescribed value, causes the air to be discharged from the tubular bag body 50 and is shrunk. The tubular bag body 50 plays a role as a spoiler and can reduce the travelling resistance. |
