What is the purpose of oleo strut?
An oleo strut is a pneumatic air–oil hydraulic shock absorber used on the landing gear of most large aircraft and many smaller ones. This design cushions the impacts of landing and damps out vertical oscillations.
How much hydraulic fluid should be put into an oleo strut?
Typically it takes around a gallon of hydraulic fluid to service three struts. Nitrogen is better than compressed air for strut servicing because it is drier and doesn’t vary in pressure as much as air; it is also less corrosive to the inside of the strut housing.
What supports the aircraft when the aircraft is on the ground the nitrogen in the oleo strut or the hydraulic fluid?
The landing gear is the structure that supports the entire weight of the aircraft on the ground. It lets the aircraft takeoff, land, and taxi on its wheels.
What resists the shocks during taxiing in an oleo pneumatic strut?
Gas in the upper chamber, functioning like a spring, is compressed by the hydraulic fluid to absorb the impact of touchdown as well as bumps during taxiing. The hydraulic fluid, therefore, restricted by the orifice, acts to dampen the movement of the piston during shock absorption and recoil.
Is a strut a shock?
The major difference between shocks and struts is that a strut is a structural part of the vehicles suspension system where a shock is not. A strut is also crucial part of the vehicles steering system and greatly affects alignment angles.
How does an oleo strut dampen the shock of landing?
Oleo struts absorb and dissipate shock loads using a combination of two fluids — a gas and a hydraulic fluid — contained in two chambers — a cylinder and a piston. Gas in the upper chamber, functioning like a spring, is compressed by the hydraulic fluid to absorb the impact of touchdown as well as bumps during taxiing.
What is the difference between spring oleo struts and air oleo shock struts?
In spring oleo struts, the spring supports the A/C weight on the ground and during taxiing and oleo strut aborts the shock of landing. In air oleo struts, the air supports the A/C weight on the ground and abserts shocks during taxiing and oleo strut aborts the shock of landing.
What device in an oleo strut controls the rate of flow between one chamber and the next?
The taper of the pin controls the rate of fluid flow from the bottom cylinder to the top cylinder at all points during the compression stroke. In this manner, the greatest amount of heat is dissipated through the walls of the strut.
What is the need of flow metering pin in oleo strut?
Most shock struts employ a metering pin similar to that shown in Figure 1 for controlling the rate of fluid flow from the lower chamber into the upper chamber. During the compression stroke, the rate of fluid flow is not constant. It is automatically controlled by the taper of the metering pin in the orifice.
