Aero-engine central transmission bevel gear shaft and mounting structure thereof

Abstract

The invention provides an aero-engine central transmission bevel gear shaft. The shaft comprises a bevel gear shaft body; the bevel gear shaft body is provided with a conical portion, and a preset angle is formed between the conical portion and the axis of an engine; transmission teeth are arranged at the end of the conical portion; a back conical portion is formed between the transmission teeth and the conical portion; one sides of the transmission teeth of the bevel gear shaft body are provided with first protrusions extending in the axis direction of an engine; a drawing groove used for disassembling and assembling the central transmission bevel gear shaft is formed between the first protrusions and the conical portion; and the back conical portion is provided with an annular groove capable of installing a damping ring. According to the central transmission bevel gear shaft, the disassembling manufacturability can be remarkably improved, the problems of damage to a back conical surface, stress concentration and the like in the disassembling process of a central transmission bevel gear can be avoided, the use performance of the central transmission bevel gear shaft is improved, and the service life of the central transmission bevel gear shaft is prolonged.

Description

technical field [0001] The application belongs to the technical field of aero-engine transmission structures, and in particular relates to an aero-engine central transmission bevel gear shaft and its installation structure. Background technique [0002] The central transmission gear shaft is an important force transmission component between the aeroengine rotor and the accessory transmission system. Its main function is to transmit power and torque between the engine rotor shaft and the engine accessories. The central transmission active bevel gear shaft is inside the engine and is connected to the high-pressure rotor Cooperate, the structural size is limited by the internal structural space of the engine bearing cavity, the working time is the same as the engine working time, and the performance of the central transmission gear shaft directly affects the service performance and life of the engine. [0003] A typical central drive driving bevel gear shaft 20 such as figure ...

AI Technical Summary

Problems solved by technology

[0004] However, since the central transmission active bevel gear shaft 20 is inside the aeroengine, it is affected by the vibration, temperature and rotational speed of the engine during operation, and the working environment is complex and harsh, and the disassembly and assembly process of each engine needs to be disassembled and reassembled with the engine. use

The central drive active bevel gear shaft in the prior art is disassembled by pulling the back cone surface, which has poor disassembly process, and is easy to cause surface damage on the back cone surface and stress concentration, which affects the service performance and life of the bevel gear shaft; And it does not have the adjustment function of resonance speed. When a resonance failure occurs during work, a new design of the bevel gear shaft that can be replaced in situ inside the engine is required. The workload is heavy, the cost is high, and the cycle is long.

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