Simple detection method for KOYO bearings lacking lubricating oil

The normal use color of KOYO bearing lubricants is brown and blue black. If it is milky yellow, it indicates that diesel oil or water is added to the oil and should be replaced in time. If it is dark black, it indicates that the oil has deteriorated and must be replaced in time.

The oil to be inspected is evenly mixed and dropped on a white paper (preferably a filter paper) to form oil spots, and the oil spots gradually diffuse from the center outward for about 2 to 3 hours to form three concentric rings. The state of the oil can be discerned based on the color, width and shape of the three areas.

Remove a little oil from the low shell of the oil, apply it on your fingers, and rub it with your fingers and thumb. If you feel that there is impurities in the oil or that it is not sticky like water, or even hairy or sour, the oil has deteriorated. If you can see a small shiny metal grinding on your finger after honing, it means that the engine has a serious wear part, and it also means that the oil must be replaced immediately.

1. Judging from KOYO bearing size specifications

First of all, it is necessary to focus on the KOYO bearing dimensional accuracy, rotation accuracy, internal clearance and mating surfaces, raceway surfaces, cages and seals. Then, for the result of the inspection, it can be judged by the inertial bearing or the master bearing.

2. Whether the KOYO bearing is reused

The criteria for judging the use of KOYO bearings are based on their mechanical properties and importance as well as the inspection cycle. In the event of breakage and defects in the bearing components and peeling of the rolling surface of the raceway, the bearings must not be reused and must be replaced.

In the process of using KOYO bearings, in order to be able to fully play and maintain its proper performance for a long time, regular maintenance measures should be taken. The use efficiency of the bearing can be improved by the following appropriate cleaning inspection measures.

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FAG flat bearing fault handling and necessary maintenance measures

When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When the body of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the temperature of the FAG bearing is too high.

The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the assembly of the planar bearing is too tight; the bearing race rotates on the shaft or inside the casing; Too large; bearing cage or rolling element fragmentation.

Planar bearings allow a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact, the bearing is faulty.

The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the bearing and the housing, the bearing and the shaft are broken, resulting in the axis deviating from the correct position and generating an abnormal sound when the shaft is moving at a high speed. When the bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, FAG bearings are insufficiently lubricated, dry friction is formed, and bearing crushing and the like can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.

1. Bearing maintenance: In order to maintain the original performance of the bearing in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy.

Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. The maintenance items in operation include the rotation sound, vibration, temperature, and lubricant status of the FAG bearing.

2. Inspection of the bearing: Cleaning of the bearing: When disassembling the bearing for repair, first record the appearance of the flat bearing, confirm the residual amount of the lubricant, and wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.

The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. In rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

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