Rack and pinion hydraulic pressure horizontal loading retraction and extending test table mechanism

Abstract

The invention discloses a rack and pinion hydraulic pressure horizontal loading retraction and extending test table mechanism and belongs to the technical field of undercarriage test. The rack and pinion hydraulic pressure horizontal loading retraction and extending test table mechanism mainly comprises a loading supporting mechanism, a hydraulic pressure loading and retarding mechanism, and a simulation horizontal force loading mechanism; wherein the loading supporting mechanism consists of a vertical shaft frame, an upper connection seat (8), a lower connection seat (23), and a lifting plate (9); and the hydraulic pressure loading and retarding mechanism consists of a linkage turntable (27), a reduction gear (26), a rack (25) and a loading actuator cylinder (24); and the simulation horizontal force loading mechanism consists of an arc guide rail (18), a first movable pulley (17), a second movable pulley (19), a fixed pulley (21) and a wire rope (20). During test, the rack and pinionhydraulic pressure horizontal loading retraction and extending test table mechanism loads an undercarriage by simulating aerodynamic load and solves the problems of insufficient travel of the loadingactuator cylinder and loading speed, guarantees that the lateral force is always in a horizontal direction, and is more close to an actual stress model.

Description

[0001] technical field [0002] The invention relates to a rack-and-pinion hydraulic horizontal loading retractable test bench mechanism, which belongs to the technical field of landing gear tests. technical background [0003] Landing gear retractable fatigue test is a dynamic characteristic test for simulating aircraft takeoff and landing. The research, design and verification of landing gear system can be carried out through the retractable test bench. The common retractable test bench is column type, which is mainly composed of column frame, hanging plate, landing gear system, retractable mechanism, motion guiding mechanism, hydraulic system, loading mechanism and so on. The loading mechanism mainly plays the role of simulating aerodynamic loading. [0004] The landing gear retractable system is an important part of the aircraft, and the working performance of the system directly affects the safety and maneuverability of the aircraft. In order to reduce the resistance o...

AI Technical Summary

Problems solved by technology

[0009]First, the stroke of the loading actuator is limited, which may not be able to meet the height required by the large-sized landing gear; second, the speed of the loading actuator is relatively small, it may not be able to meet the speed required when the landing gear is retracted; third, it is difficult to ensure that the direction of the force is always the same; fourth, the moment equivalent method will generate additional force, resulting in an inaccurate force model during the retraction process

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