Helicopter rotor shaft
NV shaft is loaded by forces and moments on his sleeve and the torque generated at the output of GH. HB Nala length is determined by field layout, aerodynamic and operational considerations.
From the layout considerations of choosing the minimum allowable height HB accommodation sleeve above the fuselage, taking into account the deflection of the blade; aerodynamic - determine the excess back HB above the front of the helicopter in longitudinal scheme; Maintenance - define the safe height HB plane in finding staff in the area of the rotating screw.
The distance between the co-axial screws is chosen from the condition of ensuring an adequate supply on the approximation, which prevents collision of the upper and lower screws of the blades in all flight modes, and if the necessary evolutions.
Forces and moments caused in the rotating shaft of variable bending stress, changing with the speed of the screw. The values of forces and moments are determined from the aerodynamic calculation of the helicopter. Their value significantly affects the alignment of the helicopter, which changes when you change the direction of thrust of the screw shaft relative to HB. This changes the magnitude and the resultant transverse force acting on the shaft.
To increase the flexural endurance shafts except rational selection configuration (smooth transitions from one diameter to another, larger radii of curvature), the relevant technological processing methods, such as shot peening. Work hardening can undergo the shaft completely, inside and out (except, for example, threads), and separate places, the most dangerous in terms of endurance. Carving in dangerous sections can harden knurled. The roughness of the surface treatment of the shaft in the area of significant bending stresses is performed no more than R z = 2,5. In some cases, introduced subsequent polishing surfaces.
In 4.3.4, and given CIL rear shaft HB helicopter CH-47 longitudinal scheme. Val pilot helicopter Boeing-360, made of composite material.
The KCC shaft helicopter HB ONE-84 effected separation of the console tree pas two autonomous element. The inner shaft (spring) 5 is designed to transmit torque from the gearbox to the hub HB. Thrust and shear forces are perceived HB stationary relative to the fuselage outer cantilever shaft 4.
To ensure the operability of the shaft must be met, primarily, the conditions of their strength and rigidity. Only if the shaft transmits torque Mcr, its diameter can be found by the formula.
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