Aircraft turning mechanism

Abstract

The invention discloses an aircraft turning mechanism. The aircraft turning mechanism is connected between an undercarriage outer cylinder and a rotating piston rod, and comprises a first actuating cylinder, a second actuating cylinder, a rack, a gear and a supporting frame, the gear is connected to the rotating piston rod of an undercarriage, one end of the rack is connected with a pushing pistonof the first actuating cylinder, the other end of the rack is connected with a pushing piston of the second actuating cylinder, the supporting frame is located on the lower part of the rack, the rackand the pushing piston are in clearance connection, and the rack and the supporting frame are in rolling connection.

Description

technical field [0001] The application belongs to the technical field of aircraft design, in particular to a rack-and-pinion turning structure of an aircraft front wheel. Background technique [0002] The aircraft steering mechanism is an important part of the aircraft nose landing gear, which directly affects the ground motion quality and handling characteristics of the aircraft. The aircraft drives the piston rod of the front landing gear to rotate through the rack-and-pinion steering mechanism, thereby realizing the aircraft's turning function. Existing aircraft turning mechanisms are mainly composed of gears, racks, pistons, cylinders and rack support blocks. When pressure is supplied to one side of the cylinder, the racks and pistons move to the other side and drive the gears to rotate. [0003] The connection forms of the existing rack and pinion type turning mechanism mainly include: fixed connection and loose connection. The fixedly connected rack-and-pinion turnin...

AI Technical Summary

Problems solved by technology

The loose connection separates the piston from the rack. The piston and the rack only contact to transmit the load, and the U-shaped support block defines the three directions of the rack up, down, and back. This connection has low assembly difficulty and no side load, but when When the rack moves to one side, due to backlash, the rack shakes a lot and may collide with other parts of the mechanism, resulting in unstable movement

In the durability test of the existing rack and pinion steering mechanism in the durability test of the long-life landing gear steering mechanism, the steering mechanism in the form of a fixed connection between the original rack and the pistons at both ends has completed 510,000 durability tests. Secondary damage and oil leakage failure occurred. After the test, the cylinder body and piston of the actuator were severely worn and could not meet the long-life requirements.

Images