Patent UA-77957-U (UA)
Title: Device for reducing aerodynamic drag of vehicles
Inventor: PAVLOVSKYI ROMAN MYKOLAIOVYCH
IPC: B61H11/00
Filed: 2012-05-04
Abstract: A device for reducing aerodynamic drag of a vehicle has one or more elements of the outer surface of "K-tail" type, which is located on the rear face of a body/frame of vehicle to form in the working position of a 3D structure, while the element/elements of the outer surface are made with narrowing the shape relative to the attachment point to the base outside surfaces of the body/frame of vehicle toward from its rear face, said element/elements of the outer surface are made with increasing curvature of the outer surface away from the larger end to the smaller one, while the element/elements of the outer surface of "K-tail" type are located with formation of further reducing the cross sectional area of the ​​body/frame of vehicle with respect to its rear end dimensions by progressive reduction of the cross section of this 3D structure in accordance with the geometry of base outer side, the upper and lower surfaces of the body/frame that form an end portion of said vehicle characterized in that it further comprises a flexible clamp-sealer for slitless or reduced-slit fit of the outer surface of "K-tail" type element to the rear of vehicle, and a mechanism of adjusting the length of an element of the outer surface of "K-tail" type along the longitudinal axis of vehicle with respect to the rear surface of vehicle, while an element of outer surface of “K-tail" type is designed as a single structural unit containing two flexible shell forms - internal and external flexible shells joined together to form a sealed cavity for its filling with compressed air, with tensioning elements and frames mounted between said outer and inner shells that are hinged together at the joints, while the frames are mounted in the amount of at least two pieces, they are made in their plane in the form corresponding to the form of the back of the body/frame of vehicle, the frames are placed in the shell forms with their plane located predominantly in parallel to the plane of the back of the body/frame of vehicle, the frames are installed mainly in parallel to each other along the longitudinal axis of vehicle at a distance to each other with a reduction of dimensions of each of the next frame relative to the previous one starting with the largest frame, which is attached to the rear face of vehicle, away from said rear face of vehicle, the tensioning elements are placed in the areas of joining side, upper and lower basic elements of the body/frame in the area of rear face of vehicle, while the flexible clamp-sealer located along the rear end face of vehicle, a mechanism for adjusting the length of the element of outer surface of “K-tail" type is located in the middle of the 3D structure formed by the elements of the outer surface of “K-tail" type and attached on the back of the body/frame of vehicle, the mechanism of adjustment is made in the form of an electric drive with a tension cable, one end of which is attached to the smallest frame, and the second one – to the drum located on an axis of a motor drive, on the rear side of a vehicle locks are located to hold the folded element of the outer surface of the element of “K-tail" type in the stowed position, the tensioning elements are made in the form of metal or plastic coils with a central opening for passage of the tensioning cable, which connects different ends of coils in the folded position of said tensioning element, one end of the coils is convex, and the second one is concave with the same surface curvature, the tensioning cable is made mostly of metal, the inner and outer shells are made of airtight material with flexible limiters placed between them.