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Coaxial-rotor helicopter gearbox 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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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. |
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Multi-flow reducer for rotorcraft 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. |
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Coaxial helicopter reduction gearbox 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. |
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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. |
Another patent 2547479.