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SLF bearings are precision mechanical components that convert sliding friction between the rotating shaft and the bearing housing into rolling friction, thereby reducing friction losses. Rolling bearings generally consist of four parts: inner ring, outer ring, rolling elements, and cage. The inner ring fits with the shaft and rotates with it; the outer ring fits with the bearing housing to provide support; the rolling elements are evenly distributed between the inner and outer rings by means of the cage, and their shape, size, and quantity directly affect the performance and service life of the rolling bearing; the cage ensures uniform distribution of the rolling elements, guides the rolling elements to rotate, and provides lubrication.

SLF bearing features

1) The friction coefficient of rolling bearings is lower than that of plain bearings, resulting in higher transmission efficiency. The friction coefficient of general plain bearings is 0.08-0.12, while that of rolling bearings is only 0.001-0.005. 2) Rolling bearings have been standardized, serialized, and generalized, making them suitable for mass production and supply, and convenient for use and maintenance. 3) Rolling bearings are made of bearing steel and undergo heat treatment; therefore, they not only have high mechanical properties and long service life, but also save on the more expensive non-ferrous metals used in manufacturing plain bearings. 4) The internal clearance of rolling bearings is very small, and the machining accuracy of each component is high, resulting in high operating accuracy. At the same time, the rigidity of the bearing can be increased by applying preload. This is very important for precision machinery. 5) Some rolling bearings can withstand both radial and axial loads simultaneously, thus simplifying the structure of the bearing support. 6) Due to the high transmission efficiency and low heat generation of rolling bearings, lubricating oil consumption can be reduced, making lubrication maintenance easier; 7) Rolling bearings can be conveniently applied to shafts in any spatial orientation.

SLF bearing usage precautions

Needle roller bearings have high load capacity and are suitable for support structures with limited installation dimensions. The journal surface is hardened to serve as the rolling surface. The bearings are press-fitted into the housing bore and do not require additional axial positioning. An appropriate amount of grease should be injected before installation; typically, no further lubrication is required after assembly. BK type bearings are used in supports where the journal has no protruding end; the closed ends provide sealing and can withstand small axial movements. Causes of damage: Generally speaking, 33.3% of needle roller bearing failures are due to fatigue damage, 33.3% are due to poor lubrication, and another 33.3% are due to contaminants entering the bearing or improper equipment handling. [Keep the bearing and surrounding environment clean from dust; fine dust invisible to the naked eye is a strong killer of bearings, as it can increase bearing wear, vibration, and noise. Strong impacts during equipment use, such as directly striking the bearing with a hammer, can transmit pressure through the rolling elements and likely cause damage to needle roller bearings. Impact of using non-professional tools for installation: Using suitable and accurate tools can help avoid using materials like cloth and short fibers. Whether in laboratory tests or actual applications, it is clearly observable that identical-looking needle roller bearings under the same operating conditions can have significantly different service lives.

SLF bearing troubleshooting

Rolling bearing faults generally manifest in two ways: excessive temperature at the bearing installation site and noise during operation. 1.) Excessive bearing temperature: During mechanism operation, a certain temperature is allowed at the bearing installation site. When touching the mechanism housing by hand, it should not feel hot; otherwise, it indicates excessive bearing temperature. Causes of excessive bearing temperature include: lubricating oil quality does not meet requirements or has deteriorated, lubricating oil viscosity is too high; mechanism assembly is too tight (insufficient clearance); bearing assembly is too tight; bearing rings rotate on the shaft or within the housing; excessive load; fracture of the bearing cage or rolling elements, etc. 2) Bearing noise: Slight operating sounds are allowed for rolling bearings during work. If the sound is too loud, or there is abnormal noise or impact sound, it indicates a bearing fault. The causes of noise in rolling bearings are complex. One cause is wear on the mating surfaces of the inner and outer rings. This wear disrupts the fit between the bearing and the housing, and between the bearing and the shaft, causing the axis to deviate from its correct position and producing abnormal noise when the shaft moves at high speed. When the bearing fatigues, surface metal spalling occurs, which also increases the radial clearance and produces abnormal noise. In addition, insufficient bearing lubrication leading to dry friction, and bearing breakage, will also produce abnormal sounds. After bearing wear becomes loose, cage loosening and damage will also produce abnormal noise. 3) Bearing wear: Rolling bearing wear is a common equipment problem during shaft use, mainly caused by the metal characteristics of the shaft: although metal has high hardness, it has poor conformability (cannot recover after deformation), poor impact resistance, and poor fatigue resistance, making it prone to adhesive wear, abrasive wear, fatigue wear, and fretting wear. Most shaft wear is not easily detected; it is only noticed when there is high machine temperature, large jump amplitude, or abnormal noise. However, by the time it is detected, most rolling bearings are already worn, causing machine shutdown.

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