Foldable retractable structure and retractable method for undercarriage

Abstract

The invention discloses a folding retraction structure of an undercarriage and a retraction method thereof. The folding retraction structure comprises a retraction actuating cylinder and an undercarriage strut, one end of the retraction actuating cylinder is hinged with the middle part of a support arm, and the other end of the retraction actuating cylinder and one end of the support arm are hinged and fixed with an engine body, so that the retraction actuating cylinder and the support arm form an oscillating guide bar mechanism; the other end of the support arm is hinged with one side at theupper end of the undercarriage strut, the other side at the upper end of the undercarriage strut, an upper fixture block lock stay bar, a lower fixture block lock stay bar, a stay bar and the lower end of the undercarriage strut are hinged into a whole sequentially to form a planar linkage mechanism, and a hinged shaft between the lower fixture block lock stay bar and the stay bar is fixed on theengine body; hinged shafts and connection axes in the oscillating guide bar mechanism and the planar linkage mechanism are placed in a same plane, and the rotation motion of the connection axes aroundthe hinged shafts and the piston rod telescopic motion of the retraction actuating cylinder are also placed in the plane. The invention has compact structure and small collection space, so that the undercarriage is retracted forwards.

Description

technical field [0001] The invention relates to an aircraft landing gear, in particular to a foldable retractable structure and a retractable method for the aircraft landing gear. Background technique [0002] With the rapid development of small and medium-sized aircraft and unmanned aerial vehicles, the demand for high-speed, high-performance, and high-reliability aircraft is increasing, and higher requirements are placed on the storage space and reliability of retractable nose landing gear. Small and medium-sized aircraft and UAVs are limited by weight, space and aerodynamic shape, requiring the space of the landing gear compartment at the front of the aircraft to be as compact as possible; at the same time, the mounting at the front of the aircraft limits the enveloping space for retracting and retracting the landing gear. [0003] At present, the structure of the retractable nose landing gear for small and medium-sized aircraft and unmanned aerial vehicles generally cons...

AI Technical Summary

Problems solved by technology

This type of retractable landing gear has a simple structure, and the retractable actuating cylinder directly drives the undercarriage to rotate and retract. Usually, the stroke of the retractable actuating cylinder with this structure is longer, resulting in a larger space arrangement for the retracting actuating cylinder. Thereby the storage space of the landing gear compartment 14 is increased; the retractable actuating cylinder of this retractable mode is arranged on the same side of the landing gear retractable movement, and for the front landing gear retractable toward the nose, due to the limited space , often brings limitations to the installation and arrangement of the landing gear; at the same time, this structure has a small pressure angle of the retractable actuator near the retracted position, resulting in low work efficiency

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