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The front landing gear
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The front landing gear

The front landing gear

 

The front chassis is a one of the important components of the aircraft, may provide additional rigidity to the wings or feathers aircraft. The reception is one of the main components chassis systems in airplanes any class. This part of the chassis receives and transmits the aircraft body relaxed static loads. The maximum load per rack is marked with the planting. Damping system allows the chassis to minimize the blow from touchdown when landing.

Landing gear in the truss fuselage

The truss structure of the fuselage is designed in such a way that all the loads are assumed by the farm, which consists of four or three flat-shaped farms. In this design, apart from the rack, an important part are both braces and struts. In the farm fuselage, the landing gear of the chassis works for compression and tension. In modern aircraft building, the truss type of the hull is practically not used, since the beam fuselage is more effective. The advantage of the beam fuselage is that the load and torque forces from the chassis rack are transmitted to the whole body due to the power frame consisting of stringer, spars and frames.

The front landing gear of the aircraft photos

Rack stands the most important structural components of the aircraft landing gear. This part receives and transmits a total airframe all dynamic and static loads occurring at the time of takeoff.

The components of the landing gear

  • Stacking brace - provides the perception of loads of Lot forces.

  • Shock chassis - ensures smooth movement of the aircraft on the runway system. The main objective is to damping of oscillations and shocks that occur when the machine touch the runway on landing. In most cases, long-stroke damping using nitrogen-oil shock absorbers with multiple cameras. If necessary, set the stabilizing dampers.

  • Bracing - it stems, that have a diagonal position relative to the hinge of the polygon that is formed stays and bar. In turn, the brace provides invulnerability of the whole structure of the polygon.

  • Traverses - chassis elements that provide a rack mount to the fuselage or wing.

  • Orientation rack gear - enables a turn with the release or cleaning racks.

  • At the reception there is a lower node located at the base of the design, it allows for mounting the wheels.

  • Locks - the mechanisms that allow us to fix the rack in position.

  • Cylinders - provides cleaning and landing gear systems.

Initially, when creating the first cars in aviation, they had a non-retractable landing gear. This was one of the main sources of aerodynamics in flight. To reduce the degree of resistance, on the chassis of aircraft installed flaps - fairings, which covered the racks and chassis. The chassis systems, which were retracted into the fuselage, began to be used with the advent and development of high-speed aircraft. Of course, this complicated the design and added extra weight, but at the same time the machines acquired the necessary streamlining. In modern models of passenger aircraft, the landing gear racks are retracted along the wing span to the fuselage.

The front landing gear of the aircraft photos

shock resistant Layouts

Depending on the manner in which shock absorbers are arranged relative to the support, such types of racks is isolated circuits:

  • Telescopic.

  • Lever.

  • Polurychazhnaya.

The telescopic structure of the scheme combines the rack tube type shock absorber. The tube acts as a cylinder, which is located in the middle of the piston and piston rod, the connection elements forms a pair of telescoping. The bottom of the rod are mounted wheels. To avoid the possibility of turning the rod in the middle of the cylinder using a hinge, providing Stem under the influence of the machine weight.

This scheme has some drawbacks, among which is the lack of lateral loads and loads of depreciation of a frontal collision. Part of the front kick is amortized by tilting the landing gear in the plane parallel to the symmetry of the body. A more efficient option is considered to be swinging telescopic racks. In this embodiment, the rack fixed on. Stiffness released position is provided by strut.

The front landing gear scheme

Lever arrangement differs in that the gear wheels are mounted on a lever system connected to the fuselage or permanent joint. Due to the fact that the shock absorber strut rod connected to the lever pivot on itself support the bending moment is not transmitted. It provides excellent conditions for the seal damper.

There are three main subtypes of arm racks:

  • Lever rack in the middle of a shock absorber set.

  • Lever Front shock absorber with remote type, which is mounted on the outside of the support.

  • Lever type without stand.

All of these options allow the structure of the pillars provide excellent cushioning at the front of the aircraft impact. This is carried out rotation of the lever and the further compression damper.

Polurychazhnaya circuit has elements in its design as a lever and strut. The main difference is that the chassis wheels are attached by hinges to the rack itself and not to the stem. Shock absorber struts begin their work under vertical load. Mitigating the impact of the front is excellent, but it is transferred to the rod with its further bending.

How to make a landing gear? (video)

Landing with a strong side wind, look at the chassis

 

All of the chassis

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