US 12,286,220 B2
Rotor craft and negative torsion variable paddle thereof
Zhe Chen, Nanjing (CN); Xu Zhou, Nanjing (CN); Qijun Zhao, Nanjing (CN); Zhuangzhuang Cui, Nanjing (CN); Binwu Ren, Nanjing (CN); and Muyang Lin, Nanjing (CN)
Assigned to Nanjing University of Aeronautics and Astronautics, Nanjing (CN)
Filed by Nanjing University of Aeronautics and Astronautics, Nanjing (CN)
Filed on Feb. 2, 2024, as Appl. No. 18/430,816.
Claims priority of application No. 202310103717.8 (CN), filed on Feb. 10, 2023.
Prior Publication US 2024/0270379 A1, Aug. 15, 2024
Int. Cl. B64C 27/473 (2006.01)
CPC B64C 27/473 (2013.01) [B64C 2027/4736 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A negative torsion variable paddle, comprising: a control assembly; the control assembly comprises a main shaft and a driver, the main shaft is connected with a hub, the driver is connected with the main shaft, and the main shaft is connected with a pull rod of a swashplate; a composite paddle; the main shaft is connected with a leading edge of the composite paddle, an output end of the driver is in transmission connection with a trailing edge of the composite paddle, and the driver is configured to push the trailing edge of the composite paddle; the composite paddle comprises first paddles and second paddles, the first paddle is connected with the second paddle, the first paddle or the second paddle farthest away from the control assembly is fixedly connected with the main shaft, and the rest of the first paddles and the second paddles are rotatably connected with the main shaft; the first paddle is of a rigid structure, the second paddle comprises a deformed layer, a cascade and a flexible skin, the deformed layer is made of elastic materials, the number of the deformed layers is multiple, the deformed layers are arranged in parallel along the direction of the main shaft, the adjacent deformed layers are connected at intervals by using the cascade, the cross-sectional shape of the cascade is consistent with that of the first paddle, the flexible skin covers the outside of the deformed layer and the cascade, and the flexible skin is connected with the first paddle.