TIMKEN bearing grease filling amount to eliminate friction faults

In the case of grease lubrication, if the recommended amount of grease is added to the TIMKEN bearing (or for relubrication), during the first few hours or several working days (depending on the application speed), TIMKEN bearings The resulting friction will be much higher than the initial calculated value. This is because the grease requires time to agitate and redistribute in the free space of the bearing. To estimate the effect of this factor, the initial rolling friction torque can be multiplied by a factor of 2 for the light series bearing and 4. for the counterweight series. However, after the "run-in" phase, the friction torque drops to approximately Equivalent to the level of oil lubrication, in many cases, may even drop to a lower level. If excessive grease is added to the bearing, it may cause increased friction in the bearing.
After the damage of TIMKEN bearing, not all parts can be repaired. Only those TIMKEN bearing damages with maintenance value need to be repaired. The damaged TIMKEN bearing should be removed for inspection and identification. If the expected service life has been approached or reached, no maintenance is necessary.
In addition to this, it is necessary to judge whether there are repair conditions, such as: understanding of TIMKEN bearing structural performance and manufacturing requirements, various tools, equipment, metering and mastery of repair technology required for repair. In addition, the repair cost and the repaired TIMKEN bearing performance must meet the requirements of the work host must be analyzed. Some TIMKEN bearing spare parts are not adequately prepared or purchased if limited by cost and procurement conditions

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Koyo imported bearing damage investigation and countermeasures

The fatigue failure of Koyo imported bearings is a failure of the surface form, mainly manifested by the initiation of fatigue cracks, expansion and fracture processes, and the long-term effects of load failure on the metal. The crack is in two ways:
1. On the surface, this is the external load caused by the cyclic deformation of the contact surface of the plastic surface of the Koyo bearing during the rolling contact, and finally the development of small cracks. The inner surface, the formation of surface cracks between the two, due to the intrusion of lubricant into the working surface, the open force, severely hit the wall, forcing the crack to advance;
2, from the surface layer, repeated pressure, surface contact, initially cracked cracks at the surface where the surface is exposed, and the angle along the surface direction, to a certain depth, from the surface of the contact surface, and beyond The surface, and eventually formed an eclipse, leaving a horse pit.
From the surface of Koyo imported bearings, or from the cracks in the surface layer, these two objectives (parts carburizing, quenching and other surface heat treatment, if there is uneven hardness, microstructure, and non-uniform internal stress and other disadvantages, then Contact stress is generally caused by the influence of the opposite underground crack. If the surface quality of the part is poor, there is a defect (oxidation, decarburization), friction or poor lubrication, from the surface crack.
The method of controlling the rolling sound is to select a low-noise Koyo bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.
Bearings can have a long life under proper use. If damage occurs prematurely, it is most likely due to incorrect selection, improper use or poor lubrication.
Therefore, when installing Koyo bearings, we need to record the type of machine, the installation location, the conditions of use and the surrounding fit. Through research to summarize the type of bearing damage, the use environment when the problem occurs, to avoid similar situations happen again.

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