German PRESSOL bearings, PRESSOL models, PRESSOL prices

PRESSOL roller bearings with cylindrical rollers; relative to their diameter, the rollers are both thin and long. These rollers are called needle rollers. Despite having a small cross-section, the bearings still exhibit high load-carrying capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, where L is the roller length), resulting in a compact radial structure. When the inner diameter and load capacity are the same as other types of bearings, the outer diameter is minimized, making them particularly suitable for support structures with limited radial installation space. Depending on the application, one may select bearings without inner rings or needle roller and cage assemblies. In this case, the journal surface of the shaft and the housing bore surface directly serve as the inner and outer rolling surfaces of the bearing. To ensure that the load capacity and operating performance match those of bearings with rings, the hardness, machining precision, and surface quality of the raceway surfaces on the shaft or housing bore must be similar to those of the bearing ring raceways. This type of bearing can only withstand radial loads.

PRESSOL bearing features

1) The friction coefficient of rolling bearings is lower than that of sliding bearings, resulting in higher transmission efficiency. The friction coefficient of general sliding 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 very convenient for use and maintenance. 3) Rolling bearings are manufactured from bearing steel and undergo heat treatment; therefore, they not only possess high mechanical properties and long service life but also save on expensive non-ferrous metals used in manufacturing sliding bearings. 4) The internal clearance of rolling bearings is very small, and the machining precision of each component is high, resulting in high operating precision. At the same time, bearing rigidity can be increased by applying preload, which is very important for precision machinery. 5) Certain rolling bearings can simultaneously withstand radial and axial loads, thereby simplifying the structure of the bearing housing. 6) Due to the high transmission efficiency and low heat generation of rolling bearings, lubricant consumption is reduced, making lubrication maintenance easier; 7). Rolling bearings can be conveniently applied to shafts in any spatial orientation.

PRESSOL bearing usage precautions

Needle roller bearings have high load-carrying 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, eliminating the need for additional axial location. An appropriate amount of grease should be applied before installation; under normal circumstances, 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 accommodate small axial float. Causes of damage: Generally speaking, 33.3% of needle roller bearing failures are caused by fatigue damage, 33.3% are due to poor lubrication, and another 33.3% result from contaminants entering the bearing or improper equipment handling. [Clean the bearing and surrounding environment of fine dust. Microscopic dust invisible to the naked eye is a potent killer of bearings, as it can increase bearing wear, vibration, and noise. Strong impact during equipment use can easily cause needle roller bearing damage, such as directly striking the bearing with a hammer, which transmits pressure through the rolling elements. Impact of non-professional installation tools: Use suitable and precise tools to strictly avoid using cloth and short-fiber materials. Whether in laboratory tests or actual applications, it is clearly observable that needle roller bearings with identical appearance under the same operating conditions can have significantly different service lives.

PRESSOL bearing troubleshooting

Failure phenomena of rolling bearings generally manifest in two ways: excessive temperature at the bearing installation site, and noise during bearing operation. 1.) Excessive bearing temperature: During mechanism operation, a certain temperature at the bearing installation site is permissible. When touching the mechanism housing by hand, it should not feel hot to the touch; otherwise, it indicates excessive bearing temperature. Causes of excessive bearing temperature include: lubricant quality not meeting requirements or deterioration, excessively high lubricant viscosity; overly tight mechanism assembly (insufficient clearance); overly tight bearing assembly; rotation of the bearing ring 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 permitted for rolling bearings during work. If the sound is too loud, or if 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 relationship between the bearing and the housing, and between the bearing and the shaft, causing the axis to deviate from its correct position, resulting in 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. Additionally, insufficient bearing lubrication leading to dry friction, and bearing breakage, will produce abnormal sounds. After bearing wear leads to looseness, 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, thus easily causing adhesive wear, abrasive wear, fatigue wear, and fretting wear. Most shaft wear is not easily detected; it only attracts attention when machine overheating, large jump amplitude, or abnormal noise occurs. However, by the time it is noticed, most rolling bearings are already worn, causing machine shutdown.

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