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An air deflector, which is adapted to be mounted on the roof of a cab of a tractor pulling a trailer and has a frontwardly facing totally curved air deflecting surface that is symmetrical about a vertical center plane and is forwardly convex in all horizontal and vertical cross-sectional planes, is

An air deflector, which is adapted to be mounted on the roof of a cab of a tractor pulling a trailer and has a frontwardly facing totally curved air deflecting surface that is symmetrical about a vertical center plane and is forwardly convex in all horizontal and vertical cross-sectional planes, is disclosed. To define the deflecting surface, the deflector has a central portion and a pair of symmetrical rearwardly turned wing portions at the opposite sides of the central portion and includes a top edge of substantially circular curvature and a base edge of substantially elliptical curvature. The deflector is installed for angular adjustment about a horizontal axis to a number of different positions correlated with both the height difference between the tractor cab and trailer roofs and the distance between the rear of the cab and the front of the trailer, and so that the base edge of the deflector is located at a predetermined height above a given horizontal plane disposed below the plane of the cab roof and so that in all adjusted positions of the deflector the vertex of the included angle between the radii of curvature of the top and base edges of the deflector at the vertical center plane is located below the plane of the cab roof and on the said horizontal plane. This abstract is not to be taken either as a complete exposition or as a limitation of the present invention, however, the full nature and extent of the invention being discernible only by reference to and from the entire disclosure.

대표청구항 ▼

An air deflector suitable for mounting on the roof of a cab of a tractor of a tractor-trailer vehicle and providing a frontwardly facing air-deflecting surface for reducing air resistance to forward movement of the tractor-trailer vehicle, wherein the improvement comprises: A. said air-deflecting su

An air deflector suitable for mounting on the roof of a cab of a tractor of a tractor-trailer vehicle and providing a frontwardly facing air-deflecting surface for reducing air resistance to forward movement of the tractor-trailer vehicle, wherein the improvement comprises: A. said air-deflecting surface is (1) symmetrical about a vertical center plane and has a central portion and a pair of lateral wing portions symmetrically located on opposite sides of said central portion, (2) is totally curved and forwardly convex in all its horizontal and vertical cross-sectional planes, and (3) in said central portion has a uniform radius of curvature in all horizontal and vertical cross-sectional planes; B. said deflector has a top edge and a base edge; C. the center of curvature of said central portion of said air-deflecting surface is located on a plane that is parallel to the plane of said base edge of said deflector and below the same, the perpendicular distance between said planes being the product of (a) the radius of curvature extending from said center of curvature to said base edge and (b) the sine of an angle of about 12°to 16°included between that radius and the lower one of said planes; and D. the radii of curvature of said wing portions of said air-deflecting surface are smaller at said base edge than said radius of curvature of said central portion and gradually increase until at said top edge the radii of curvature of said wing portions are merged into and become equal to the radius of curvature of said central portion.