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Fault analysis of crankshaft rolling bearings

wallpapers Industry 2020-11-12
Increased bearing clearance
Bearing radial and axial clearances increase, bearing radial and axial clearances increase, except for dry friction and excessive friction and wear during startup. It is mainly caused by the friction between the metal particles on the surface of the parts and the sand, dust and dirt in the lubricating oil on the rolling elements and raceways. The bearing has a significant increase in the clearance between the ring and the rolling elements due to abrasive wear, a matte surface has been formed on the raceway, and uneven scratch marks have appeared. The prevention method is to replace the lubricating oil on time, and the lubricating hole should be sealed to prevent the entry of dirt.
Bearing inner ring moves
There is a gap between the movement of the inner and outer rings of the bearing and the wear of the mating parts, and the inner ring of the bearing moves. The inner ring of the rolling bearing adopts an interference fit with the journal. The maximum interference of the inner diameter of the front bearing is 0.055mm, and the minimum interference is 0.012mm. The maximum interference of the inner diameter of the rear bearing is 0.046mm, and the minimum interference is 0.003mm. From the above coordination point of view, if the bearing has been disassembled and assembled several times, there may be a gap between the inner ring of the bearing and the journal, and the journal must be repaired before application.
Bearing outer ring moves
The outer ring of the bearing moves around. In order to facilitate disassembly and assembly, the outer ring of the rolling bearing adopts a transitional fit with the seat hole. The maximum interference of the outer ring of the front bearing is 0.035mm, and the maximum clearance is 0.013mm. The maximum interference of the outer ring of the rear bearing is 0.016mm, and the maximum clearance is 0.06mm. When assembling, the seat hole must be measured, and its interference or clearance cannot exceed the above range, otherwise the seat hole must be repaired.

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