Aerodynamic tractor-trailer wind fairing that improves operating fuel economy
View Patent ↗A tractor-trailer wind fairing panel assembly includes two side and one top fairing panels that mount to a truck tractor and aerodynamically bridge the air gap to any fifth-wheel utility trailer being pulled by the tractor. Such fairing panels are hinged on their leading edges so their distal trailing edges can swing a bit to accommodate twisting and turning of the utility trailer during use. The hinges all mount to a cab adapter collar that helps fit the whole to the contoured surfaces of the rear of a typical truck tractor cab. The distal ends of the trailing edges are fitted with inward directed wind seals. Rows of ball bearing pucks are arranged in the crowns of the inward directed wind seals to reduce friction and wear as the fairing panels swing to accommodate the twisting and turning of the utility trailer.
1. A tractor-trailer wind fairing panel assembly that aerodynamically bridges air gaps between truck-tractors and their fifth-wheel type trailers, comprising:
a cab adapter collar having left and right side vertical lengths and an inter-connecting horizontal top length, and contoured on a front face to match the contours of a rear outer periphery of a drivers cab of a particular type of truck-tractor;
a set of three continuous hinges, of which a first is disposed vertically in a rear face of the left side length of the cab adapter collar, of which a second is disposed vertically in a rear face of the right side length of the cab adapter collar, and of which a third is disposed horizontally in a rear face of the inter-connecting horizontal top length of the cab adapter collar;
a left fairing panel pivotally hinged to the first continuous hinge and having a distal trailing-edge free to swing left-right within a limited range;
a left-side wind seal disposed vertically along the inside of the trailing edge of the left fairing panel, and providing a line of contact between the left fairing panel and a left front side of any fifth-wheel utility trailer coupled to the truck-tractor;
a right fairing panel pivotally hinged to the second continuous hinge and having a distal trailing-edge free to swing left-right within a limited range;
a right-side wind seal disposed vertically along the inside of the trailing edge of the right fairing panel, and providing a line of contact between the right fairing panel and a right front side of any fifth-wheel utility trailer coupled to the truck-tractor;
a top fairing panel pivotally hinged to the third continuous hinge and having a distal trailing-edge free to swing up-down within a limited range;
a top-side wind seal disposed vertically along the inside of the trailing edge of the top fairing panel, and providing a line of contact between the top fairing panel and a top front part of any fifth-wheel utility trailer coupled to the truck-tractor.
2. The tractor-trailer wind fairing panel assembly of claim 1 , wherein:
the left, right, and top fairing panels are each constructed of an outer skin and an inner skin of plastic sheet material and form a hollow interior when joined together.
3. The tractor-trailer wind fairing panel assembly of claim 1 , further comprising:
a hollow gallery disposed inside each of the left-side, right-side, and top-side wind seals; and
a number of ball bearings disposed inside each of the left-side, right-side, and top-side wind seals, and positioned to bear all contact and reduce sliding friction with said fifth-wheel utility trailer coupled to the truck-tractor.
4. The tractor-trailer wind fairing panel assembly of claim 1 , further comprising:
a set of brackets and springs arranged to press the distal edges of the left, right, and top fairing panels against any trailer coupled to the particular type of truck-tractor, and further arranged to limit the inward swings of each of the left, right, and top fairing panels to no less that that needed for any trailer coupled to the particular type of truck-tractor to press itself in between the distal ends while coupling.