Pillar), torsion arm or rocker arm, wheel and braking device, etc. When the landing gear is lowered and locked, it is usually
It is a statically determinate spatial bar system structure, which is used to bear and transmit the concentrated force from the wheel and is also convenient for unlocking.
Line up and down. Force analysis is as follows:
Simple strut landing gear and strut landing gear
The main stress-bearing components of these two types are shock-absorbing struts, which are connected with the machine body structure and the machine shaft, and play the role of beams and columns.
The characteristics of these two structural types are as follows:
(1) has a simple and compact structure and relatively direct force transmission. Cylindrical pillars have good comprehensive properties of compression, bending and torsion, so they are light in weight and easy to store.
(2) Different axle forks can be used to adjust the mutual position between the wheel contact point and the connecting point of the airframe structure and the height of the whole landing gear. Forks generally bear combined stress caused by bending moment and torque in two planes, as well as shear force.
(3) Because the two fulcrums at the upper end of the simple pillar type are very close, the damping pillar is close to a cantilever beam, and the bending moment at the root of the upper end is large. In the strut type, a strut is often added near the middle of the strut, so that the shock-absorbing strut is stressed in the form of a double-fulcrum cantilever beam, which greatly reduces the bending moment at the upper end of the strut. Struts are usually used as folding links. Or directly use the telescopic actuator to lock in a certain position as a pillar, which will simplify the structure of the landing gear. Pillar type is commonly used at present.