Outer spherical bearing disassembly skills

The outer spherical bearing fixes the inner ring of the bearing to the shaft through an eccentric sleeve, and the hexagon socket screw on the eccentric sleeve acts as a fastening. In the maintenance, many operators will not disassemble such bearings, so it is necessary to introduce the technical points and precautions for disassembling the outer spherical bearings:

First, disassembly

1. First loosen the locking screw on the eccentric sleeve of the bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the direction of rotation of the shaft.

2. Loosen the bolts that secure the bearing housing. Remove the bearing from the shaft together with the housing. Note before removing the bearing housing at one end of the shaft. The bearing block bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other.

Second, the installation

1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil is rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).

2. Apply lubricant to the bearing seat and bearing mating surface, and install the bearing into the bearing housing. Then the assembled bearing is placed on the shaft together with the bearing housing. Push to the desired location for installation.

3. The bolts of the fixed bearing housing should not be tightened first, so that the bearing housing can rotate in the bearing housing. Also install the other end bearing and seat on the same shaft, turn the shaft a few turns, and let the bearing itself automatically find the position. Then fasten the bearing block bolts.

4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the shaft is tightened by hand in the direction of rotation. Then insert or hold the small iron rod against the counterbore on the eccentric sleeve. 1. Use a hammer to strike a small iron rod in the direction of rotation of the shaft. Install the eccentric sleeve securely and finally lock the socket head cap screws on the eccentric sleeve.

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Fault detection caused by KOYO bearing assembly and improper clearance

KOYO bearings are the main components of locomotives, especially traction motors and axlebox KOYO bearings. Their functions play a decisive role in safe transportation. When the locomotive is running online, once the KOYO bearing fails, the whole train will not run, and the transportation will be blocked. On the positive line, especially the failure of passenger trains, the negative impact is even greater. At the same time, once the locomotive KOYO bearing fails, it is very difficult to repair the locomotive. Therefore, it prevents and reduces the occurrence of locomotive KOYO bearing failure, and the safety of the locomotive. Transportation is very important. Can you detect KOYO bearings with hidden troubles before KOYO bearings are loaded?

The serious damage of KOYO bearings is often not caused by a single cause, but in a combination of several aspects, a vicious cycle occurs under severe operating conditions, resulting in serious burning of KOYO bearings, so it is often difficult to judge after an accident It is caused by some reasons, and it also brings certain difficulties to our related measures. For the convenience of discussion, we first analyze the reasons for the failure of KOYO bearings from several aspects.

When KOYO bearings are used for a period of time, KOYO bearing inner rings, rolling elements, cages, outer rings, raceways, etc. produce certain defects and scars, resulting in poor lubrication of KOYO bearings, causing heat generation of KOYO bearings, long-term heating, Will lead to: (1) dilution of KOYO bearing lubricants. (2) Accelerate the fatigue of the material and reduce the hardness. Due to the above reasons, a vicious cycle is further formed, and the overheating is accelerated to burn the KOYO bearing. The serious KOYO bearing inner ring displacement, the rolling element is out of round, the collision heats up, and finally welded together. Therefore, when running online, if KOYO bearings are found to be severely hot and smoke, do not stop, but keep running to the front station, because the overheated KOYO bearings are in a molten state at this moment, once they stop cooling, they can no longer walk and block the positive line.

It is very important for the oil supply maintenance of the locomotive KOYO bearing, especially for the KOYO bearing. The KOYO bearing has a good lubrication effect. The lack of oil and too much oil can easily cause KOYO bearing failure. KOYO bearings are poorly lubricated and heated. If more is added, it is easy to cause agitation and overheating. Therefore, it is necessary to supply oil in maintenance. At the same time, the cleaning of KOYO bearing grease is also very important. Once other impurities and moisture are dropped into the grease, it will affect. Normal play and build the necessary oil film.

The use time of KOYO bearings is too long, which exceeds the service life of KOYO bearings, which is easy to cause fatigue of materials. In addition, the material is deformed by strong impact, which causes the rollers and raceways to be peeled off and crushed, resulting in poor lubrication and The vibration is increased.

KOYO bearing inner ring and shaft match clearance interference does not match, it is also easy to cause KOYO bearing failure, large interference, it is easy to cause KOYO bearing inner ring to crack due to excessive tensile stress, the interference is too small, also It is easy to cause the KOYO bearing inner ring to "relax".

KOYO bearing assembly with improper clearance can also cause KOYO bearing failure, small clearance is easy to cause friction between the roller and the raceway. As the temperature rises, KOYO bearing inner ring, rolling element, cage, outer ring The temperature of the end caps is not the same, there is a temperature difference between them, so the amount of expansion is also slightly different, which causes a further reduction of the matching clearance, and the heat generation of the KOYO bearing is added. If the clearance is too large, the vibration of the roller is increased, which aggravates the impact of the roller and the raceway. At the same time, the internal load distribution is uneven, the load bearing roller is reduced, and the central roller load is excessive.

When the KOYO bearing is assembled, the KOYO bearing is not impacted by the copper hammer, which causes the cage to be deformed. The inner and outer rings of the traction motor KOYO bearing are incorrectly installed or other reasons cause the axial traverse amount to disappear, causing the KOYO bearing shaft to squash.

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