German UNIFLEX bearings UNIFLEX models UNIFLEX prices

UNIFLEX bearings are bearings that operate under sliding friction. Plain bearings operate smoothly, reliably, and without noise. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear. The oil film also has a certain vibration absorption capacity. However, the starting friction resistance is relatively high. The part of the shaft supported by the bearing is called the journal, and the part mating with the journal is called the bearing bush. The anti-friction material layer cast on the inner surface to improve the friction properties of the bearing bush surface is called the bearing lining. The materials of the bearing bush and bearing lining are collectively referred to as plain bearing materials. Plain bearings are generally used in high-speed and light-load operating conditions.

UNIFLEX bearing classification

According to the structure of rolling elements and rings, they can be divided 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 outer spherical ball bearings, etc. 1) Deep groove ball bearings have a simple structure and are easy to use. They are the type of bearing with the largest production batch and the widest application range. They are mainly used to bear radial loads and can also bear a certain axial load. When the radial clearance of the bearing increases, it has the function of an angular contact bearing and can bear 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), so the radial structure is compact. 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 the same load capacity and operating performance as bearings with rings, the hardness, machining precision, and surface quality of the raceway surfaces of the shaft or housing bore should be similar to those of the bearing ring raceways. This type of bearing can only bear 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 a higher limit speed and can simultaneously bear 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. Mostly used in: oil pumps, air compressors, various transmissions, fuel injection pumps, printing machinery. 4) Self-aligning ball bearings have two rows of steel balls, two raceways in the inner ring, and a spherical inner surface in the outer ring raceway, providing automatic self-aligning performance. 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 seat holes cannot be guaranteed. This type of bearing mainly bears radial loads and can also bear a small amount of axial load while bearing radial loads. They are usually not used to bear pure axial loads; if bearing pure axial loads, only one row of steel balls will be loaded. Mainly used in agricultural machinery such as combine harvesters, blowers, paper machines, textile machinery, woodworking machinery, bridge crane walking wheels, and transmission shafts. 5) Self-aligning roller bearings have two rows of rollers and are mainly used to bear radial loads, while also being able to bear axial loads in any direction. This type of bearing has high radial load capacity and is particularly suitable for working under heavy loads or vibration loads, but cannot bear pure axial loads. It has good self-aligning performance and can compensate for coaxiality errors. Main applications: paper machinery, reduction devices, railway vehicle axles, rolling mill gearbox seats, crushers, various industrial gearboxes, etc.

UNIFLEX bearing advantages

1) Low friction resistance, low power consumption, high mechanical efficiency, easy to start; 2) Standardized dimensions, interchangeable, easy to install and disassemble, convenient maintenance; 3) Compact structure, lightweight, reduced axial dimensions; 4) High precision, high load capacity, low wear, long service life; 5) Some bearings have automatic self-aligning performance; 6) Suitable for mass production, stable and reliable quality, 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 rotating friction torque; 9) Bearing deformation is less sensitive to load changes than hydrodynamic bearings; 10) Only a small amount of lubricant is needed for normal operation, and lubricant can be provided for a long time during operation; 11) Axial dimensions are smaller than traditional hydrodynamic bearings; 12) Can simultaneously bear combined radial and thrust loads; 13) Unique design can achieve excellent performance over a wide load-speed range; 14) Bearing performance is relatively insensitive to fluctuations in load, speed, and operating speed.

UNIFLEX 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 a rolling bearing bears pure axial load, thrust bearings are generally selected; when a rolling bearing bears pure radial load, deep groove ball bearings or short cylindrical roller bearings are generally selected; when a rolling bearing bears 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 radial bearings and thrust bearings can be combined. This is particularly suitable for extremely high axial loads or special requirements for high axial rigidity. b. Permissible speed varies greatly depending on the bearing type. Generally, bearings with low friction and low heat generation are suitable for high speeds. During design, efforts should be made to ensure that rolling bearings operate below their limit speed. c. Rigidity. When a bearing bears a load, elastic deformation occurs at the contact point between the bearing ring and the rolling element. The amount of deformation is proportional to the load, and their ratio determines the bearing rigidity. Bearing rigidity can generally be improved by preloading the bearing. In addition, considering the combination and arrangement of bearings in the bearing support design can also improve the support rigidity. d. Self-aligning performance and installation errors. After the bearing is installed in its working position, poor installation and positioning often occur due to manufacturing errors. At this time, excessive loads on the bearing caused by shaft deflection and thermal expansion can lead to early damage. 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 (so-called separable bearings), making installation and disassembly convenient.

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