Split torque transmission speed reduction device for helicopter

Abstract

The invention discloses a split torque transmission speed reduction device for a helicopter. Each engine input shaft is connected with a power input shaft through an overrunning clutch; a straight toothed spur gear on each power input shaft is engaged with two face gears installed in the opposite directions to achieve the power shunting, first-stage speed reduction and the reversing functions. The face gears are connected with the corresponding straight toothed spur gears through corresponding duplicate gear shafts and transmit power uniformly to the four straight toothed spur gears to achieve the second torque split and second-stage speed reduction functions. Power is transmitted to four herringbone toothed spur gears by the four straight toothed spur gears through the four duplicate gear shafts, and the four herringbone toothed spur gears are engaged with a fifth herringbone toothed spur gear correspondingly to achieve the second-stage speed reduction and parallel operation functions. The split torque transmission speed reduction device adopts multistage gear transmission, and is high in transmission ratio and low in vibration noise. Power is shunted through multiple branches. Torque transmitted by the gears in all the branches is reduced. The bearing capacity of the gears is improved. The fatigue life of the gears is prolonged. Accordingly, a transmission system has higher survivability.

Description

technical field [0001] The invention relates to the field of helicopter speed reducers, in particular to a split-torque transmission speed reduction device for helicopters. Background technique [0002] Since the helicopter came out, the transmission type of its reducer has been continuously improved. In the traditional helicopter reducer, the power of the engine is transmitted in a single way from input to output, and decelerates step by step; Stage planetary reduction output to the rotor shaft. But this traditional configuration is only suitable for the main reducer of light and small tonnage helicopters. Once the transmission power increases, the volume of the reducer will increase, the quality will increase, and the vibration and noise will also increase. This is not desired by the designer and the user, so the development and improvement of the helicopter reducer is imperative. [0003] The transmission system of the Apache helicopter prototype AH-64M adopts a spur g...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN101708774A "Helicopter main transmission system uses face gear and herringbone gear transmission combined shunt mechanism", on the basis of the AH-64M transmission system, the parallel level is changed to the herringbone gear meshing confluence, on the one hand to avoid the axial force of the gear The phenomenon of unevenness, on the other hand, the large overlap reduces the load of each pair of gears and improves the bearing capacity of the gears, but because there are only two stages of transmission, it cannot be applied to the working conditions of large transmission ratios

However, since the two spur gears on the input shaft are difficult to accurately split the power in half, it will cause the spur gear near the engine end to bear most of the torque, greatly reducing its service life

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