Main decelerator for middle and small size helicopters

Abstract

The invention discloses a main decelerator for middle and small size helicopters. The upper end of a rotor shaft is the output end, and a shaft sleeve is arranged on the middle-upper part; a deep groove ball bearing is arranged on the upper part of the shaft sleeve, a secondary driven helical bevel gear is arranged on the middle part of the shaft sleeve, a jointed sun gear is arranged on the lower part of the shaft sleeve, three planetary gears are in mesh transmission with the sun gear respectively, and three planetary gears mesh with the gear ring respectively to form a planetary gear train; the gear ring is fixed on an annular base through a key, a horizontal transmission shaft is arranged on one side of the outer part of the base through supporting seats and a supporting board, a secondary driving helical bevel gear and a primary driven helical bevel gear are respectively arranged on two ends of the transmission shaft through splines, and the primary driven helical bevel gear is an input gear. The main decelerator disclosed by the invention adopts the technologies of nested installation for the sun gear shaft with the rotor shaft and integrated design for the planetary gear train bearing, the installation space is saved, the number of key parts is reduced, the system reliability is improved, the whole structure has the advantages of high carrying capacity, compact structure and easy maintenance, and the whole power transmission is U-shaped.

Description

technical field [0001] The invention belongs to the technical field of transmission systems of small and medium-sized helicopters, and in particular relates to the main reducer of the transmission system of small and medium-sized helicopters. Background technique [0002] As one of the most distinctive creations of aviation technology in the 20th century, helicopters are widely used in military transportation, patrol, tourism, rescue and other fields. Although my country has become one of the few countries in the world capable of developing helicopters, the number of helicopters in our country is relatively small, and the number of civilian helicopters is even less. The key bottlenecks are high cost, short maintenance intervals and low reliability. With the continuous development of my country's national economy, the development of the western region and the needs of national defense construction, China will have a very urgent demand for helicopter products in the future, esp...

AI Technical Summary

Problems solved by technology

[0006] 1. The main reducer composed of multi-stage gear transmission is characterized by simple structure, but low load capacity and efficiency, and small range of transmission ratio;

[0007] 2. The structure of the main reducer imitating the military helicopter is composed of one-stage or multi-stage planetary gear train and multi-stage spur or helical gear train transmission. It is arranged longitudinally, with large vertical installation space, and the reliability is limited by the life of the planetary gear train bearings. , In addition, for the multi-stage planetary gear train, the reliability is poor and the maintenance is inconvenient

[0009] So far, there are few designs specifically for the main reducer of small and medium-sized helicopters and the integrated design of the planetary gear train bearing of the main reducer.

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