Method for decomposing bearing at lower end of main regulating oil pump of aero-engine

Abstract

The invention relates to the field of maintenance of aero-engines, in particular to a method for decomposing a bearing at a lower end of a main regulating oil pump of an aero-engine, wherein decomposing efficiency is improved and the scrap cost is lowered. The method comprises the steps: a, first, tensioning rubber of pullers of pull ends of two decomposing devices, then arranging the two decomposing devices in an inner hole of a driving gear bearing and an inner hole of a driven gear bearing, then fixedly arranging a punch on the top of the decomposing device, and bringing the driving and driven gear bearing assemblies upward; b, then, separating the driving gear bearing from a side plate of the driving gear bearing; c, then, pulling out the side plate of the driving gear bearing through a side plate take-out structure of the side plate pulling device; and d, taking out the driving gear bearing after decomposing the side plate of the driving gear bearing; e, repeating ways of the step b to d, taking out the driven gear bearing; and f, polishing burrs. The method is in particular suitable for a process for decomposing the bearing at the lower end of the main regulating oil pump of the aero-engine.

Description

technical field [0001] The invention relates to the field of aero-engine maintenance, in particular to a method for decomposing a bearing at the lower end of a main fuel pump of an aero-engine. Background technique [0002] When overhauling an aeroengine main fuel pump regulator, it must be disassembled. Among them, the main and passive gear bearing assembly at the lower end of the oil pump is a combined structure of bearings and side plates, which is very easy to cause stagnation when disassembled. This is because the friction force generated by the rubber rings installed on both sides of the side plate is uneven during extraction, and the side plate is easily separated from the bearing, resulting in a certain deviation. It can be extracted vertically in the radial direction, and the extraction after deviation will easily cause the bearing or side plate to collide with the housing, resulting in metal shavings and burrs, resulting in more and more stuck, and finally resulti...

AI Technical Summary

Problems solved by technology

Among them, the main and passive gear bearing assembly at the lower end of the oil pump is a combined structure of bearings and side plates, which is very easy to cause stagnation when disassembled

This is because the friction force generated by the rubber rings installed on both sides of the side plate is uneven during extraction, and the side plate is easily separated from the bearing, resulting in a certain deviation. It can be pulled out radially and vertically, and pulling out after deviation will easily cause the bearing or side plate to collide with the shell, resulting in metal shavings and burrs, which will lead to more and more stuck, and finally make it impossible to pull out or damage the shell and bearings

The probability of jamming is about 85%. At present, the only way to get stuck is to smear the inner cavity of the shell with lubricating oil and grease, polish off the generated burrs, clean up the metal chips and pull them out repeatedly. The average decomposition time is about 40 minutes , the scrap rate is as high as 28%

However, the original disassembly tooling can only make friction with the inner hole of the bearing after the rubber of the puller is tightened, overcome the friction force between the bearing, the side plate and the shell, and take out the two bearings and the side plate together in the radial direction. Unable to solve problems caused by card lag

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