Germany EMHART bearings EMHART models EMHART prices

EMHART bearings are a type of rolling bearing and are widely used components in modern machinery. They support rotating parts through rolling contact between main elements. Roller bearings are now largely standardized. Roller bearings offer advantages such as low starting torque, high rotational accuracy, and ease of selection. Rolling bearings are classified into ball bearings and roller bearings based on the rolling elements. Roller bearings support rotating parts through rolling contact between main components. Different roller bearings can withstand different radial and axial loads. When selecting roller bearings, selection should be made based on specific operating conditions. Roller bearings mainly include structural types such as spherical roller bearings, thrust spherical roller bearings, tapered roller bearings, and cylindrical roller bearings.

EMHART 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 the friction coefficient 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 very convenient to use and maintain. 3) Rolling bearings are manufactured from bearing steel and undergo heat treatment; therefore, rolling bearings not only have high mechanical performance and long service life, but also save on the more 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 accuracy. At the same time, the rigidity of the bearing can be increased by preloading. This 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 can be reduced, making lubrication maintenance easier; 7) Rolling bearings can be conveniently applied to shafts in any spatial orientation.

EMHART 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 end face provides sealing and can accommodate small axial float. 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. [Clean the bearing and surrounding environment from dust; fine dust invisible to the naked eye is a powerful killer of bearings, as it can increase bearing wear, vibration, and noise. Strong impact during equipment operation 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 tools: Use suitable and accurate tools to strictly avoid using 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.

EMHART bearing troubleshooting

Rolling bearing failures 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 is permitted at the bearing installation site. 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 permitted 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, 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, and bearing breakage, will also 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 high temperature, large runout, or abnormal noise occurs. However, by the time it is noticed, most rolling bearings are already worn, causing machine shutdown.

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