Toggle type nose wheel steering mechanism and work method

Abstract

The invention relates to a toggle type nose wheel steering mechanism and a work method, belonging to the field of airplane nose gear manipulation nose wheel steering mechanisms. Compared with the traditional rack and pinion type steering mechanism, a push-and-pull actuator cylinder serves as an actuating device, thereby improving the safety life of the mechanism; the mechanism fully uses the lower toggle length and increases the steering mechanism force arm through the space distribution and the main structure of the invention is open, thereby facilitating the improvement of the system maintainability; compared with the double-actuator cylinder type steering mechanism, the panel motion of the double actuator cylinders of the double-actuator cylinder type steering mechanism is changed intospace motion, and the double actuators are distributed at the position of an upper toggle on the traditional nose landing gear to replace the original toggle, thereby saving space and increasing the functions of the mechanism while not influencing the maintainability.

Description

technical field [0001] The invention belongs to the field of an aircraft nose landing gear steering nose wheel steering mechanism. technical background [0002] Referring to the 14th volume of the "Aircraft Design Manual", "Aircraft Landing Gear Design: Principles and Practices" and relevant SAE reports, there are currently two main design forms of the front wheel steering mechanism of domestic and foreign aircraft, namely the rack and pinion and the cylinder type. Among them, small aircraft mainly use rack and pinion, while large aircraft mostly use double-acting cylinder-type turning mechanisms. [0003] The rack and pinion steering mechanism is mostly used in small and medium-sized aircraft. The front wheel steering mechanism in the form of rack and pinion has continuous and stable transmission, compact structure, and is easy to realize the control of the hydraulic system. Or plastic deformation and other phenomena have little effect on the overall performance, so its r...

AI Technical Summary

Problems solved by technology

The double actuator type steering mechanism can provide greater steering torque, and its structure is reliable, easy to meet the requirements of strength and fatigue, long service life and easy to reduce weight, but the actuators are all located in the same plane, and the mechanism takes up space large, which in turn increases the requirement for the retractable space of the front wheel; as the angle of the actuator is constantly changing during the rotation of the front wheel, and requires a complex hydraulic system to control, the rotation efficiency is unstable and difficult to guarantee Its reliability; low dependence on manufacturing and installation accuracy, easy to control costs; because its structure is loosely distributed, it is easy to repair and maintain

However, because its rotation is not uniform and easily disturbed by external factors, the transmission is not stable enough; the structure is loose, and it is inconvenient to retract and retract the landing gear.

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