German ZEN bearings ZEN models ZEN prices

ZEN bearings are linear motion systems produced at low cost, designed for infinite travel in combination with cylindrical shafts. They are widely used in sliding components of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery.

ZEN 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 achieved standardization, serialization, and generalization, making them suitable for mass production and supply, and are very convenient to use and maintain. 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 expensive non-ferrous metals used in manufacturing plain 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, the rigidity of the bearing can be increased by preloading. 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 housing. 6) Due to the high transmission efficiency and low heat generation of rolling bearings, lubricant consumption can be reduced, making lubrication maintenance easier; 7) Rolling bearings can be conveniently applied to shafts in any spatial orientation.

ZEN 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, and the bearings are press-fitted into the housing bore without requiring further axial positioning. An appropriate amount of grease should be injected before installation; typically, no further lubrication is needed after assembly. BK type bearings are used in supports where the journal has no protruding end; the closed ends serve as seals 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 impact during equipment use, such as directly striking the bearing with a hammer, can transmit pressure through the rolling elements and likely cause damage to the needle roller bearing. Impact of using non-professional tools for installation: Using suitable and accurate equipment can help avoid using materials like cloth and short fibers. 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.

ZEN bearing troubleshooting

Failures in rolling bearings 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 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 does not meet requirements or has deteriorated, lubricant 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 permissible for rolling bearings during work. If the sound is too loud, or there is abnormal noise or impact sounds, 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, 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. In addition, insufficient bearing lubrication leading to dry friction, as well as 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 issue 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 only becomes noticeable when there is high machine temperature, large jump amplitude, or abnormal noise. However, by the time it is noticed, most rolling bearings are already worn, causing machine shutdown.

Weidou Intelligent Technology specializes in selling German ZEN plain bearings, ZEN rolling bearings, ZEN spherical plain bearings, ZEN deep groove ball bearings, ZEN angular contact ball bearings, ZEN self-aligning ball bearings, ZEN thrust ball bearings, ZEN double-direction thrust angular contact ball bearings, ZEN combination bearings, ZEN thrust roller bearings, ZEN needle roller bearings, ZEN outer sphere ball bearings, ZEN self-aligning roller bearings, ZEN flanged bearings, ZEN linear bearings, ZEN original German imports. Welcome inquiries and orders from users.