Unmanned aerial vehicle with variable sweepbacks and spans of wings

Abstract

The invention provides an unmanned aerial vehicle with variable sweepbacks and spans of wings, which comprises a vehicle body, the wings and a tail wing, wherein a cross beam is arranged in the middle of the vehicle body; a mechanism for controlling sweepback changes is arranged between the wings and the cross beam; the mechanism for controlling sweepback changes is a four-bar linkage mechanism which comprises a stepping motor, a driving rod and a pushing rod; and the wings include main wings and auxiliary wings. The auxiliary wings can freely move in or out of the main wings by means of relative displacement between the rack and the gear, resulting in the changes of span. Further, the main and the auxiliary wings are provided with friction wheels to achieve the limiting and vibration-reducing effects. The mechanism for controlling sweepback changes has a small size and light weight and can meet the requirements for unmanned aerial vehicles. Besides, the span change is achieved by therelative displacement between the rack and the gear, the running is stable, and no response lag influence exists.

Description

technical field [0001] The invention relates to an unmanned aerial vehicle with variable wing sweep angle and length, and belongs to the technical field of aircraft design. Background technique [0002] High-altitude and long-endurance UAVs have a large aspect ratio and can realize long-term reconnaissance on the ground, but at the same time, they have the disadvantages of insufficient maneuverability and low flight speed; combat UAVs have fast flight speed and strong maneuverability, and are suitable for Dogfighting and strikes against known targets. If encountering the multi-task of not only searching for reconnaissance targets but also striking them in time, neither of the two types of UAVs is competent. If the aerodynamic shape of the UAV is actively changed so that it can always be in the best state according to different flight conditions and missions during flight, the multi-task optimized flight of the UAV can be realized. At present, the aerodynamic shape of the U...

AI Technical Summary

Problems solved by technology

[0003] In terms of changing the sweep angle, hydraulic transmission or crank-slider mechanism is usually used at present, but the hydraulic transmission is large and heavy, and the slider on the crank-slider mechanism is driven by a screw, which has a bulky structure and slow speed. Therefore, the above two methods of changing the sweep angle are not suitable for application on UAVs

In terms of variable length, gas brake drive and lead screw nut drive are usually used at present, but the gas actuator drive method has disadvantages such as poor speed stability and lagging action, and the lead screw nut method has the disadvantages of large torque required for movement, Disadvantages such as slow transmission speed

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