A rotor pitch varying system

Abstract

The invention discloses a rotor pitch varying system including a central bevel gear, a bevel pinion, a pitch shaft fixed to a paddle grain, a self-lubricating bearing and a drive steering gear, the top and the bottom of the central bevel gear are provided with tooth surfaces, The output shaft of the driving steering gear is connected with a first gear through a key, and the tooth surface inner wall of the top of the central bevel gear is meshed with the firstgear the tooth surface of the bottom of the central bevel gear is meshed with four small bevel gears uniformly distributed at the periphery, the small bevel gear is connected with the inner end of the variable pitch shaft, and the outer end of the variable pitch shaft is connected with a paddle blade through a bolt hole. A method forchanging that lift force of rotor by changing the pitch of rotor in helicopter features that the rotational speed and the total pitch are combined in different flight states, and the rotor can obtaingreat pull force under the same motor power condition compared with the traditional method for regulating the rotational speed of motor, and the control response of rotor is fast and the efficiency ishigh. The invention features that the rotational speed and the total pitch are combined in different flight states. Highly modular design for later maintenance.

Description

technical field [0001] The invention relates to the technical field of rotors, in particular to a rotor pitch variable system. Background technique [0002] At present, the rotors of multi-rotor drones on the market are mostly fixed-pitch propellers, that is, its pitch (or blade installation angle) is fixed, and the lift force needs to be changed by adjusting the rotor speed. The distribution of the pitch is generally a compromise between the high speed state and the low speed state, so the blades generally do not work in the optimal combination state of pitch and speed. The installation angle of the rotor blades is fixed, and the rotor adjusts the rotor pulling force by changing the speed. When the rotor speed is not in its optimum speed range, its aerodynamic efficiency and power efficiency are significantly reduced, the noise and vibration levels of the rotor increase, and the performance of the rotor drops sharply. This is serious. The improvement of rotor pull performa...

AI Technical Summary

Problems solved by technology

The installation angle of the rotor blades is fixed, and the rotor adjusts the rotor pulling force by changing the speed. When the rotor speed is not in its optimum speed range, its aerodynamic efficiency and power efficiency are significantly reduced, the noise and vibration levels of the rotor increase, and the performance of the rotor drops sharply. This is serious. Limited improvement in rotor pull performance

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