Assembling method for three-fulcrum bearing of aircraft engine

Abstract

The invention discloses an assembling method for a three-fulcrum bearing of an aircraft engine, belonging to the technical field of engine overhaul. The assembling method comprises the following steps that: a central bevel gear is placed in a heating oven for heating, and a bearing outer ring is assembled in the central bevel gear; a spring ring is mounted on the central bevel bear for fixing the bearing, and the bearing is mounted in a manner that a marking face of the bearing faces to the spring ring; the bearing is cooled to achieve the temperature of an ambient medium, the maximum diameter and the minimum diameter of a runway of the bearing outer ring mounted in the central bevel gear are measured, then diameters on four planes of the runway of the bearing outer ring are measured, and then an average value is obtained; a bearing retainer and a bearing rolling rod are mounted in an inner ring of the bearing outer ring, and the bearing retainer is mounted in an manner that a marking face of the bearing retainer faces to the spring ring; a bearing inner ring is mounted on a low-pressure turbine shaft, and numbers in sets face to the front end face of the low-pressure turbine shaft; the bearing inner ring is cooled, and the low-pressure turbine shaft is cooled to obtain the temperature of ambient environment; and the maximum diameter and the minimum diameter are determined by measuring the diameters on six planes of a runway of the bearing inner ring, and then the bearing assembling play is calculated.

Description

technical field [0001] The invention belongs to the technical field of engine repair, in particular to an assembly method of an aeroengine three-point bearing. Background technique [0002] The three fulcrum bearings of the aero-engine are placed at the front end of the low-pressure turbine rotor and are an important part of the engine support system. The three-point bearing is a cylindrical roller bearing, which consists of an inner ring, an outer ring, rolling elements and a cage. The inner ring is assembled on the low scroll shaft and rotates with the low scroll shaft, and the outer ring is assembled on the inner ring of the central bevel gear and rotates with the high pressure assembly. Due to the relationship between the assembly position of the bearing, the working speed of the inner ring and the outer ring is inconsistent. Therefore, it bears a relatively complicated alternating load during the working process; in addition, the lubricating effect of the lubricating o...

AI Technical Summary

Problems solved by technology

[0005] The wear failure of the three fulcrum bearings in the process of engine repair will lead to the scrapping of a large number of bearings, which greatly increases the cost of engine repair

In addition, due to the frequent replacement of new products, the number of additional engine test runs has been increased, which limits the efficiency of engine repairs

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