German EPRATAL bearings EPRATAL models EPRATAL prices

EPRATAL bearings are precision mechanical components that convert sliding friction between the rotating shaft and the bearing housing into rolling friction, thereby reducing frictional 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 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 their rotation, and provides lubrication.

EPRATAL bearing classification

Based on the structure of rolling elements and rings, they can be classified into: deep groove ball bearings, needle roller bearings, angular contact bearings, self-aligning ball bearings, self-aligning roller bearings, thrust ball bearings, thrust self-aligning roller bearings, cylindrical roller bearings, tapered roller bearings, mounted insert ball bearings, etc. 1) Deep groove ball bearings have a simple structure and are easy to use. They are the most mass-produced and widely used type of bearing. They are mainly used to withstand radial loads and can also withstand certain axial loads. When the radial clearance of the bearing increases, it functions like an angular contact bearing and can withstand larger axial loads. Applied in automobiles, tractors, machine tools, motors, water pumps, agricultural machinery, textile machinery, etc. 2) Needle roller bearings are equipped with thin and long rollers (roller length is 3~10 times the diameter, and the diameter is generally not greater than 5mm), resulting in a compact radial structure. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, making them particularly suitable for support structures with limited radial installation dimensions. Depending on the application, bearings without inner rings or needle roller and cage assemblies can be selected. 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 maintain load capacity and operating performance equivalent to bearings with rings, the hardness, machining precision, and surface quality of the shaft or housing bore raceways should be similar to those of the bearing ring raceways. This type of bearing can only withstand radial loads. Examples include universal joint shafts, hydraulic pumps, sheet rolling mills, rock drills, machine tool gearboxes, automobile and tractor transmissions, etc. 3) Angular contact bearings have high limiting speeds and can simultaneously withstand radial and axial loads, as well as pure axial loads. Their axial load capacity is determined by the contact angle and increases with the contact angle. Commonly used in oil pumps, air compressors, various transmissions, fuel injection pumps, and printing machinery. 4) Self-aligning ball bearings have two rows of steel balls. The inner ring has two raceways, and the outer ring raceway is spherical, providing automatic self-aligning capability. They can automatically compensate for coaxiality errors caused by shaft deflection and housing deformation, making them suitable for components where strict coaxiality of the support housing bores cannot be guaranteed. This type of bearing mainly withstands radial loads and can also withstand small axial loads while under radial load. They are generally not used for pure axial loads; if subjected to pure axial load, only one row of steel balls will be loaded. Mainly used in combine harvesters and other agricultural machinery, blowers, paper machines, textile machinery, woodworking machinery, bridge crane travel wheels, and transmission shafts. 5) Self-aligning roller bearings have two rows of rollers and are mainly used to withstand radial loads, while also capable of withstanding axial loads in either direction. This type of bearing has high radial load capacity and is particularly suitable for heavy loads or vibration conditions, but cannot withstand pure axial loads. It has good self-aligning performance and can compensate for misalignment errors. Main applications: paper machinery, reduction gears, railway vehicle axles, rolling mill gearbox housings, crushers, various industrial reducers, etc.

EPRATAL bearing advantages

1) Low friction resistance, low power consumption, high mechanical efficiency, and easy starting; 2) Standardized dimensions, interchangeability, convenient installation and disassembly, and easy maintenance; 3) Compact structure, lightweight, and reduced axial dimensions; 4) High precision, high load capacity, low wear, and long service life; 5) Some bearings have automatic self-aligning capabilities; 6) Suitable for mass production, stable and reliable quality, and high production efficiency; 7) Transmission friction torque is much lower than that of hydrodynamic bearings, resulting in lower friction temperature rise and power consumption; 8) Starting friction torque is only slightly higher than running friction torque; 9) Bearing deformation is less sensitive to load changes compared to hydrodynamic bearings; 10) Requires only a small amount of lubricant for normal operation and can provide lubrication for extended periods during operation; 11) Axial dimensions are smaller than traditional hydrodynamic bearings; 12) Can simultaneously withstand combined radial and thrust loads; 13) Unique design achieves excellent performance over a wide load-speed range; 14) Bearing performance is relatively insensitive to fluctuations in load, speed, and operating speed.

EPRATAL bearing selection

There are various types of rolling bearings. The following factors can be considered for selection. a. Magnitude, direction, and nature of the load: Ball bearings are suitable for light loads, while roller bearings are suitable for heavy loads and impact loads. When the rolling bearing withstands pure axial load, thrust bearings are generally selected; when it withstands pure radial load, deep groove ball bearings or short cylindrical roller bearings are generally selected; when it withstands pure radial load along with a small axial load, deep groove ball bearings, angular contact ball bearings, tapered roller bearings, and self-aligning ball or self-aligning roller bearings can be selected; when the axial load is large, angular contact ball bearings with larger contact angles and tapered roller bearings can be selected, or a combination of radial bearings and thrust bearings can be used, which is particularly suitable for extremely high axial loads or special requirements for high axial rigidity. b. Permissible speed: There are significant differences depending on the bearing type. Generally, bearings with low friction and low heat generation are suitable for high speeds. Design efforts should ensure that rolling bearings operate below their limiting speed. c. Rigidity: When the bearing bears a load, elastic deformation occurs at the contact points between the bearing rings and rolling elements. The deformation is proportional to the load, and this ratio determines the bearing rigidity. Bearing rigidity can generally be improved by preloading the bearing; additionally, considering the combination and arrangement of bearings in the support design can improve support stiffness. d. Self-aligning performance and installation errors: After the bearing is installed in its working position, manufacturing errors often cause poor installation and positioning. In such cases, excessive loads may be applied to the bearing due to shaft deflection and thermal expansion, leading to premature failure. Self-aligning bearings can automatically overcome defects caused by installation errors, making them suitable for such applications. e. Installation and disassembly: Tapered roller bearings, needle roller bearings, etc., belong to separable bearing types (i.e., so-called separable bearings), making installation and disassembly convenient.

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