Method for disassembling self-aligning roller bearing matched with long shaft

Abstract

The invention relates to a method for detaching a spherical roller bearing matched with a long shaft. The method comprises a step of detaching the spherical roller bearing from the long shaft, wherein an outer ring is rotated so that the outer ring swings at a certain angle in the axial direction and at least one roller and part of a holding rack are exposed out of the outer ring; a first roller is taken out; the axial center of the long shaft is used as the axial center of rotation; the outer ring of the bearing is rotated so that a second roller is exposed out of the outer ring; the second roller is taken out; the axial center of the long shaft is used as the axial center of rotation; the outer ring of the bearing is rotated; all residual roller in a rolling track are taken out one by one; the outer ring and the holding rack of the bearing are taken out of the long shaft; an inner ring of the bearing is heated and a shaft journal is frozen or one of the heating of the inner ring and the freezing of the shaft journal is selected; a thermoscope is used to monitor the temperature difference between the shaft journal of the long shaft and the inner ring of the bearing; when the monitoring temperature reaches requirement, heating and freezing are stopped; and the inner ring of the bearing is pushed out of the shaft journal through a jack and is taken out from the long shaft. The method can complete detaching operation and protect the bearing and the shaft from being damaged.

Description

[Technical Field] [0001] The invention relates to a method for disassembling a spherical roller bearing matched with a long shaft. [Background technique] [0002] Many machines are equipped with long shafts, and some long shafts need to be equipped with spherical roller bearings, such as the main shaft of a megawatt wind turbine. It is inevitable that bearings or gearbox failures will occur during long-term operation and require disassembly and maintenance. Or replace the parts. At this time, the main bearing needs to be removed. Spherical roller bearings are bearings with cages and two drum rollers installed between the inner ring with two raceways and the outer ring with spherical raceways. The center of curvature of the outer ring raceway is the same as that of the bearing. The center is the same, so it has the same centering function as the self-aligning ball bearing. When the shaft or housing is deflected, it can be adjusted automatically without increasing the bearing burde...

AI Technical Summary

Problems solved by technology

When installing spherical roller bearings on the long shaft, interference fit is generally used. During assembly, the inner ring of the bearing is heated and kept warm, and then assembled. After cooling, the bearing is tightly fixed on the shaft. Due to the long characteristic of the main shaft, It is difficult to remove the bearing by usual dismounting methods such as pulling out

At present, when disassembling the bearings in such occasions, the method of saving the shaft is generally adopted as much as possible, that is, the bearing is cut open, but this will sometimes cause damage to the shaft. This disassembly method damages the bearing at the least, and damages the bearing at the worst. Both shaft and shaft are scrapped, resulting in huge economic losses and waste of resources

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