Helicopter gearbox |
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IPC classes for russian patent Helicopter gearbox (RU 2250180):
   
 The gear drive rotor helicopter / 2146636
The invention relates to the structures of the main gearbox of the helicopter powered by two or more engines
 The node of the planetary gear / 2145396
The invention relates to the nodes of the planetary gear, in particular to the nodes of the planetary gear with multi-level stepped arrangement of satellites for transmission of the helicopter
 Helicopter gearbox / 2250180
Proposed gearbox of helicopter main rotor includes two drive gears and one driven gear mounted on shaft of main rotor drive. Engines are mounted for rotation towards each other. Driven gear of main rotor shaft is directly connected with one drive gear; it is connected with other drive gear through idler.
 Coaxial helicopter reduction gearbox / 2309874
Proposed reduction gearbox for coaxial helicopter includes drive shaft, two coaxial driven shafts (inner and outer), gear train and planetary mechanisms which are kinematically interconnected; each mechanism includes sun gear wheel fitted on drive shaft and epicycle fitted on outer driven shaft. Gear train mechanism has idler units placed in carrier which is rigidly secured on inner driven shaft; number of satellites exceeds number of idler units by one; number of teeth of sun gear wheel and epicycle of gear train mechanism is multiple of number of idler units; total number of teeth of these members in planetary mechanism is multiple of number of satellites.
 Multi-flow reducer for rotorcraft / 2402710
System of reducer consists of multitude of three-step modules (26A, 26B, 26C) of power tooth gear dividing flow of torque; each module transmits torque from high-speed engine to shaft (24) of lifting screw. A packaged design of a conic flat tooth gear of the first step (S1) facilitates installation of the engine in various positions along all axes. On the second step (S2) units of hollow shafts ensure equal balance of load. On the third step (S3) each unit of the hollow shaft includes multitude of small gears engaging an output tooth gear (28) of the last step.
 Helicopter reduction gearbox / 2541566
Invention relates to aviation, specifically to helicopter transmission designs. Helicopter reduction gearbox includes case where following parts are located: bevel gear wheels connected with shafts of helicopter rotors, bevel gear forming engagements with mentioned bevel gear wheels of rotor shafts and connected with shaft mounted on tapered rolling bearings and with gear wheel fitted on this shaft. Inner rings of tapered bearings are fixed in axial direction relative to shaft, and outer rings are installed with thrust against case and sleeve beads in "tensioned" pattern. Outer bearing ring installed adjacent to crown of bevel gear has possibility of hard contact with case bead, and outer ring of the other bearing has possibility to rest on inner bead of sleeve. The latter is located in case hole with groove to interact with key connected with surface of the mentioned sleeve. Sleeve surface extends from case by its outside thread. Nut end can contact with reduction gear case from outside. The nut is made as closed cup with grooves in one of which tooth of locking device is placed. The locking device is attached to helicopter reduction gearbox case.
 Coaxial-rotor helicopter gearbox / 2541569
This gearbox comprises housing to accommodate spinning hollow vertical and coaxial shafts. Rotor is fitted on one end of every said shaft. Sump is arranged in housing case and coupled via bearings and tapered gearing with second ends of hollow shafts of upper and lower rotors. Note here that vaned pump wheel is fitted on upper rotor shaft its vanes being arranged at angle α relative to its radius and provided with orifices arranged regularly on its lower end surface, axes of said orifices being parallel with pump wheel axis. Vanes on sump inner surface are arranged at angle α relative to its radius directed opposite inclination of the vanes of said pump wheel. Chamber case is filled with lubricant and communicated via channel, clearances and orifices with bearings and gearings.
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FIELD: mechanical engineering; helicopter gearboxes. SUBSTANCE: proposed gearbox of helicopter main rotor includes two drive gears and one driven gear mounted on shaft of main rotor drive. Engines are mounted for rotation towards each other. Driven gear of main rotor shaft is directly connected with one drive gear; it is connected with other drive gear through idler. EFFECT: possibility of manufacture of helicopter with one main rotor without tail boom and without tail rotor. 2 dwg
The invention relates to the field of engineering, in particular for helicopter gearboxes. Known helicopters with one rotor have on the body of the helicopter tail boom at the end of which has optional rear air screw, which acts on the body of the helicopter in the horizontal plane (Ametican. Soviet helicopters. - M.: Mashinostroenie, page 7, 1981). Mounted in the body of the helicopter engine and gearbox will create a torque to the shaft of the main rotor. Torque equally acts on the rotor blade and the body of the helicopter, and this means that if the rotor blade is rotated in one direction, the body of the helicopter will rotate in the opposite direction. To compensate for the reactive torque of the main rotor on a helicopter with one rotor must install the tail propeller, which affects the body of the helicopter in a horizontal plane and stabilizes the body of the helicopter relative to the flight path. For this purpose, this helicopter has a tail beam, shaft, universal joints, bearings, housing bearing, angular gearbox and the propeller (Rosmarin, Dementiev, Ioffe and other Mechanical transmission helicopters. Engineering, 1983. - p.78, figure 3.6. The kinematic scheme of the transmission of helicopter MI-2). Objectives the th present invention is a helicopter with a single rotor without the tail beam and without the tail rotor. This goal is achieved by the fact that to drive the rotor are two engine shafts which rotate towards each other. Power circuit of the gearbox when it consists of a driven gear mounted on the shaft of the main rotor and is connected to one pinion of one of the engine directly, and with the second pinion of the second motor is connected through parasitic gear. List of figures Figure 1 is a diagram of the drive gear of the helicopter main rotor, side view. Figure 2 diagram of the gearbox indicating torque in the gearbox and reactive moments engines on United motor frame, top view. The gearbox of the helicopter contains the leading wheel 1, mounted on the motor shaft 2 and gear 3 mounted on the motor shaft 4. Have driven gear 5, which is installed on the shaft 6 of the main rotor of the helicopter. Between the pinion 3 and the driven gear 5 is installed parasitic gear 7. The gear housing 8 combines all the gear in a single unit. Engines 2 and 4 installed at the joint under-frame 9 figure 2. The gearbox works as follows. Engine 2 through the gear 1 transmits torque to the driven gear shaft 5 rotor 6. The engine 2 has a left-hand rotation. The engine 4 through the gear 3 and the parasitic gear 7 also passes to utasi torque on the driven gear 5. The engine 4 has a right-hand rotation. When the left rotation of the motor shaft 2 of the motor housing experiences a torque to the right - clockwise and transmits this torque to the joint under-frame 9. When the right rotation of the motor shaft 4 of the motor housing experiences a torque to the left - counterclockwise and transmits this torque to the joint under-frame 9. Torques engine cases 2 and 4 are closed on under engine frame 9, and they are directed in opposite directions. Under engine frame is subjected to force, but does not transmit any torque on the body of the helicopter. Figure 2 shows that the gear 1 transmits to the gear housing 8 force F1, the gear 7 passes on the gearbox housing 8 force F2. The pair of forces F1 and F2 causes the torque of the gearbox, and with it the body of the helicopter, which forces to have a tail boom and tail rotor. According to this invention there is still a leading gear 3 engine 4. This gear acts on the gear housing 8 force F3, which is directed towards the torque from the forces F1 and F2. The shoulder of application of force F3 is twice more than the shoulder of application of force F1 or force F2. Thus, the torque from the force F3 is equal to the moment of forces F1 and F2, and since they are directed in different directions, shutting, the housing 8 is not precautionary torque rotor on the body (fuselage) of the helicopter. This result is obtained if the axis of the pinion 3 of the motor 4 is installed on the straight line connecting the axis of the driven gear 5 and the axis of the parasitic gear 7. In all other cases, the compensation of the reactive torque of the main rotor will be weakened. The gear drive rotor helicopter from two engines, containing two wheel gear and the driven gear mounted on the drive shaft of the rotor, characterized in that the engines mounted to rotate towards each other, while the driven gear shaft of the main rotor is connected to one of the leading gear directly, and with the second pinion connected through parasitic gear.
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