Tail rotor pitch structure of unmanned helicopter

Abstract

The invention relates to a tail rotor pitch structure of an unmanned helicopter, which is composed of a bearing pedestal, a steering engine, a variable-pitch slide block, an universal drive shaft head A, a variable-pitch pull bar, an universal drive shaft head B, a pitman arm, a belt wheel, a threaded hole, a transmission shaft, a fixing threaded hole, a steering engine auricle and a tail rotor rocking arm. The bearing pedestal and a tail boom are connected through a screw, the transmission shaft and the belt wheel are fixedly connected, the power input of the transmission shaft can be realized by belt driving formed by the belt and the belt wheel; the steering engine auricle and the bearing pedestal are connected by a screw, the steering engine and the pitman arm are connected through a pitman arm screw, the pitman arm and the end part of the variable-pitch pull bar through the universal drive shaft head B; the variable-pitch slide block and a tail rotor transmission shaft are connected through the bearing, one end of the variable-pitch pull bar and the variable-pitch slide block are connected by the universal drive shaft head A, so that connection of the steering engine and the variable-pitch slide block is realized; and the variable-pitch slide block and the tail rotor rocking arm employs circumferential rotatable connection. According to the invention, a structure design of the tail rotor with high accident rate can be optimized, structural quality is mitigated, connection reliability is enhanced, and the tail rotor pitch structure is an optimization scheme of tail rotor transmission.

Description

Technical field [0001] The invention relates to the design of parts of an unmanned helicopter, in particular to a variable pitch structure of a tail rotor of an unmanned helicopter, belonging to the field of aerospace vehicle design. Background technique [0002] Unmanned helicopters are generally used for military tasks such as aviation targets, battlefield reconnaissance, damage assessment, and target guidance. They can also be used for non-military tasks such as flight tests and aerial surveying and mapping. Compared with fixed-wing aircraft, unmanned helicopters have functions such as hovering, vertical take-off and landing, and can perform tasks more flexibly. Due to the limited rotor load of the unmanned helicopter, there are very high requirements for the body structure, not only requiring light structure, but also reliable transmission and high transmission efficiency. [0003] The structure of the helicopter tail rotor is similar to that of the rotor (except for the tail ...

AI Technical Summary

Problems solved by technology

[0005] The key to the design of the tail rotor of an unmanned helicopter lies in the optimization of the transmission route and the design of the connection point, while the transmission structure of the general unmanned helicopter is often complex in the transmission route, and it is accompanied by the problem of many connection points. Improper operation can easily lead to problems

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