Aircraft landing Gear
Landing gear is an undercarriage part of the flight landing system. Aircraft landing gear has wheels equipped with shock absorbers on light planes and Hydraulic or pneumatic oleo struts on larger aircraft. The main function of the landing gear is undercarriage to the primary structure of the aircraft to enable the aircraft for a taxi, safe landing and takeoff, and to support the aircraft in the rest of the ground operation.
Landing-Gear Components
To support and stabilize the aircraft during landing and Ground taxing Landing gear assemblies are made of various components
Trunnion
It a component used in the landing gear attached to the airframe at one end other end supports by a bearing, which allows the gear to move to and fro during retraction and extension. Landing gear strut attached approximate to the center of the trunnion in downward direction.
Strut (outer Cylinder)
Is a vertical member consisting of shock absorbing mechanism, form a cylinder for the air-oleo shock absorber. Strut is also called as outer Cylinder.
Piston (Inner Cylinder)
Is a component moving to and fro inside the air-oleo shock absorber, Bottom of the piston is attached to the axle connecting truck Piston is also named as Inner Cylinder or Piston rod.
Seal
Seals are placed on the piston, which seals the air pressure in the upper part of the strut keep the inner cylinder aligned with the outer cylinder
Orifice Rod
Permits rate of hydraulic fluid flow from the inner cylinder to the upper side of the piston.
Torque Links
This connects the strut cylinder to the pistons and axle. Torque links protect the strut avoiding the extension of the piston during gear retraction and holds the wheel and axle in proper and correct aligned position in corresponding to the Strut.
Truck (bogle)
Truck is located to the bottom of the Strut piston, to which one of the axles attached to it. Truck is cylinder structure cylinder connected used when one wheel is placed behind another. Truck can tilt fore and aft at the piston connections which allows for the direction change in aircraft altitude during takeoff, landing and taxing.
Drag Link (drag strut)
To stabilize the landing gear, support the gear assembly longitudinally drag link are used. When the gear retracts forward or aft drag link will be hinged at middle allows the gear to retract.
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