Drive system for change of pitch of helicopter tail rotor and helicopter

Abstract

The invention discloses a drive system for change of pitch of a helicopter tail rotor and a helicopter. The drive system comprises a tail rotor shaft and a pitch change mechanism, wherein the pitch change mechanism comprises a pitch change disc, a pitch change sleeve and a drive assembly, a drive rod is arranged on the pitch change disc, the drive assembly comprises a steering engine, a pull rod and a pitch change rocker, the steering engine is fixed on a tail rotor support, an output end of the steering engine is located in the tail rotor support, one end of the pull rod extends into the tailrotor support and is hinged with the steering engine rocker, the other end extends out of the tail rotor support and is hinged with one end of the pitch change rocker, and the other end of the pitchchange rocker is hinged with the pitch change sleeve. The steering engine drives the pull rod to move up and down so as to drive the pitch change rocker to move with the pull rod, the pitch change rocker drives the pitch change sleeve to slide axially, so that the pitch change sleeve drives the pitch change disc to slide axially, the pitch change disc drives a tail rotor paddle assembly to rotate,and the pitch of the tail rotor is changed. Meanwhile, by arrangement of the pitch change disc, torque transfer of the tail rotor shaft is realized, and the service life of bearings and other parts is prolonged.

Description

technical field [0001] The invention relates to the field of helicopters, in particular to a driving system for variable pitch of the tail rotor of the helicopter and the helicopter. Background technique [0002] The helicopter tail rotor is used to balance the anti-torque and to control the helicopter's heading. The rotating tail rotor is equivalent to a vertical stabilizer, which can stabilize the heading of the helicopter. Although the function of the tail rotor is different from that of the rotor, they both generate aerodynamic force by rotation and work in an asymmetric airflow during forward flight. Therefore, the structure of the tail rotor has many similarities with the rotor structure. At present, the structural forms of the tail rotor mainly include the seesaw type, the universal joint type, the articulated type, the bearingless type, and the "ducted tail rotor" type. [0003] A conventional tail rotor is usually composed of a tail rotor blade, a tail rotor hub a...

AI Technical Summary

Problems solved by technology

The direct result of such a design is that its structural weight increases, and too many transmission joints will reduce the reliability of the transmission; at the same time, the rotor shaft in the prior art transmits torque through the variable pitch rod, which reduces the service life of the rod and the bearing

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