Ningbo Hardchn bearing Co., Ltd.
According to the results of the investigation and resea […]
According to the results of the investigation and research, during the visual inspection of the bearing, it was found that the removal of the bearing due to the sealing cover and the failure of the seal accounted for 47.3% of the total removal. It shows that the failure rate of newly built and overhauled bearings is relatively high during the quality guarantee period, and failures occur before the quality guarantee period, resulting in frequent bearing inspections. In particular, the unloading of bearing seal failure greatly increases the rate of bearing unloading. So what caused the sealing cover of the truck bearing to come out?
Reasons for bearing seal cover coming out
1) Because the groove depth or width of the outer ring groove is not up to the standard, or even there is no groove, the boss of the sealing cover cannot enter the groove of the outer ring. Not only does it fail to prevent the sealing cover from falling out, but also destroys it. The fit of the outer ring tooth mouth and the sealing cover tooth mouth makes the matching interference less than the standard or even no surplus. During the operation of the vehicle, the sealing cover gradually comes out due to the vibration of the vehicle.
2) Because there is no guiding chamfer on the outer side of the outer ring tooth mouth, during the assembly process of the sealing cover, the sealing cover tooth mouth boss cannot smoothly enter the outer ring tooth mouth and is cut off, resulting in no boss of the sealing cover, causing the sealing cover during vehicle operation Prolapse.
3) During the visual inspection of the unloaded bearing for truck depot repair, the specific inspection and judgment method for the unsealed cover coming out is carried out in accordance with the regulations. It is only specified in the unloading bearing: bearing (including outer ring, seal seat, seal cover, rubber oil seal, front When there are cracks, bruises, looseness, deformation or other abnormalities in the appearance of the cover, back gear, shaft end bolts, etc., remove it. For this reason, when the truck does not unload the bearing, there is no specific inspection standard for visual inspection of whether the sealing cover has come off, so that some sealing covers have not been found and unloaded in time.
4) When bearing parts are undergoing general maintenance, the dimensions of the groove depth, width, and outer ring chamfer of the outer ring are carried out in accordance with the regulations. There is no measurement standard and method, resulting in the groove depth, width and outer ring chamfer of the outer ring. Unqualified bearings of equal size cannot be discovered and controlled during general maintenance and continue to be loaded and used, which will bury hidden dangers for bearing operation.