Passive variable pitch propeller and propeller-driven unmanned aerial vehicle

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Passive variable pitch propeller and propeller-driven unmanned aerial vehicle

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CHEN ZHIPING / LI GUANGJIA / LI XILE / KANG CHUANMING / TONG YANG

The invention discloses a passive variable pitch propeller and a propeller-driven unmanned aerial vehicle. The passive variable pitch propeller comprises propeller blades and a variable pitch propeller root connected to the roots of the propeller blades, the variable pitch propeller root is in a barrel shape, the variable pitch propeller root is used for being arranged on the periphery of the propeller hub mandrel of the unmanned aerial vehicle in a sleeving mode, and the propeller hub mandrel is used for being connected with a power source; the variable pitch propeller root is provided with a torsional deformation structure, the torsional deformation structure is subjected to torsional deformation due to the change of centrifugal force generated by rotation of the propeller, and then the pitch angle of the propeller is changed. Through the torsional deformation structure of the variable pitch propeller root, the torsional deformation structure is subjected to torsional deformation due to the change of centrifugal force generated by rotation of the propeller so that the pitch angle of the propeller is changed, the annular self-adaptability can be improved, and the reliability during ultra-long endurance is guaranteed. The passive variable pitch propeller is simple in structure and low in energy consumption.

本发明公开了一种被动式变距螺旋桨及螺旋桨驱动的无人机，其中被动式变距螺旋桨包括螺旋桨叶以及连接于所述螺旋桨叶根部的变距桨根，所述变距桨根为桶状，所述变距桨根用于套设在无人机的桨毂芯轴外周，所述桨毂芯轴用于连接动力源；所述变距桨根具有扭转变形结构，所述螺旋桨转动产生的离心力变化使所述扭转变形结构发生扭转变形，进而使所述螺旋桨的桨距角改变。本发明通过变距桨根的扭转变形结构，螺旋桨转动产生的的离心力变化使扭转变形结构发生扭转变形，进而使螺旋桨的桨距角改变，能够提高环形自适应性，保障超长航时的可靠性。该被动式变距螺旋桨，结构简单，能量消耗小。