Tractor-trailer aerodynamic drag reducer

摘要

A device for reducing the aerodynamic drag on a tractor-trailer is mounted on the tractor roof and includes an upwardly inclined rearwardly extending top surface having its leading edge faired into the tractor roof. The device has side walls which extend generally vertically to connect the outer edge of the top surface of the device with the roof of the tractor. A central portion of the leading edge is recessed rearwardly of a roof mounted equipment device and defines a central top surface portion which extends upwardly from the recessed leading edge into tangency with the top surface. Laterally spaced walls depend vertically from the inboard edges of the top surface portions spaced laterally of the central top surface portion and merge with the central top surface portion and the tractor roof to cooperate therewith and with the roof mounted equipment device to define a recessed channel which imparts a low drag streamline curvature to the airflow. An opening is provided in the central top surface portion to receive a rearward portion of an air conditioning unit within the confines of the drag reducing device.