Coaxial contrarotating speed reducer

Abstract

The invention discloses a coaxial contrarotating speed reducer. A first-level planetary gear train is used for speed reduction, and two inner gear rings of a second-level composite differential gear train are used for realizing speed reduction and a constant speed output function of coaxial contrarotating. A first-level planetary gear is simultaneously engaged with a first-level center gear and a first-level inner gear ring to form a first-level speed reduction system; a second double planetary gear, a second-level double center gear, a second-level inner gear ring, a second-level double inner gear ring, a second-level fixed shaft gear and a second-level sun gear form a second-level coaxial contrarotating speed reduction system. The first-level center gear and the second-level double center gear are separately fixed to an input shaft. An output shaft is divided into an output inner shaft and an output outer shaft, the output inner shaft penetrates through the output outer shaft, and the inner and outer shafts are connected with an output optical axis. The second-level inner gear ring is fixedly connected with the output inner shaft to complete the positive output of the system; and the second-level double inner gear ring, the second-level fixed shaft gear and the second-level sun gear are fixedly connected with the output outer shaft to complete the negative output of the system. The speed reducer has the advantages of simple structure, high speed reduction ratio, large transmission torque and smooth operation.

Description

technical field [0001] The invention relates to a gear transmission reduction device, in particular to a single-input and double-output coaxial counter-rotating high-speed compound gear train reducer. Background technique [0002] Some large transport aircraft need to be equipped with a double-row propeller propulsion system; in order to improve fuel efficiency and ensure that the double-row propellers have the same speed and torque, the propulsion system often adopts a counter-rotating design for the double-row propellers. The planetary gear train has the characteristics of power split transmission, which is especially suitable for high-speed and heavy-duty equipment, and has been widely used in many industrial fields such as aviation and ships. The path of planetary gear transmission is from the input of the sun gear to the output of the planetary carrier through the planetary gears, relying on multiple planetary gears to realize the power split transmission of the gear tr...

AI Technical Summary

Problems solved by technology

[0003] In the patent 101021245A "coaxial counter-rotating high-speed planetary gear transmission", a compound planetary reduction gear with single input and double output is disclosed. The motor drive scheme and the bevel gear shunt drive scheme have the disadvantages of large volume and heavy mass; however, the single-stage reduction ratio of the compound planetary reduction device is small, which is not suitable for matching the huge speed difference between the high-speed engine and the propeller, and the applicable reduction range is relatively small. Small

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