German RENK bearings, RENK models, RENK prices

RENK roller bearings with cylindrical rollers are characterized by rollers that are thin and long relative to their diameter. These rollers are called needle rollers. Despite their small cross-section, these bearings have 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 the smallest, making them particularly suitable for support structures with limited radial installation space. 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 ensure that the load capacity and operating performance are the same as bearings with rings, the hardness, machining precision, and surface quality of the shaft or housing bore raceway surfaces should be similar to those of the bearing ring raceways. This type of bearing can only withstand radial loads.

RENK 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: 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, but 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. Applications include automobiles, tractors, machine tools, motors, water pumps, agricultural machinery, textile machinery, etc. 2) Needle roller bearings: 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 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 space. 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 raceway surfaces 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: Angular contact ball bearings have higher limit speeds and can simultaneously withstand radial and axial loads, or 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: 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 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 withstands radial loads. While withstanding radial loads, it can also withstand small axial loads. It is usually not used for pure axial loads; if subjected to pure axial loads, only one row of steel balls will bear the load. Mainly used in agricultural machinery such as combine harvesters, blowers, paper machines, textile machinery, woodworking machinery, bridge crane travel wheels, and transmission shafts. 5) Self-aligning roller bearings: Self-aligning roller bearings have two rows of rollers. They are mainly used to withstand radial loads, but can also withstand axial loads in any direction. This type of bearing has high radial load capacity and is particularly suitable for heavy loads or vibration loads, but cannot withstand 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 housings, crushers, various industrial gearboxes, etc.

RENK bearing advantages

1) Low friction resistance, low power consumption, high mechanical efficiency, and easy starting; 2) Standardized dimensions, interchangeability, easy installation and disassembly, and convenient 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 performance; 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 rotating friction torque; 9) Bearing deformation is less sensitive to load changes compared to hydrodynamic bearings; 10) Only a small amount of lubricant is needed for normal operation, and lubrication can be provided for a long time 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.

RENK 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 is subjected to pure axial load, thrust bearings are generally selected. When subjected to pure radial load, deep groove ball bearings or short cylindrical roller bearings are generally selected. When subjected to 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 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 deformation is proportional to the load, and this ratio determines the bearing rigidity. Bearing rigidity can generally be improved by preloading. Additionally, considering the combination and arrangement of bearings in the support design can improve 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 premature damage. Self-aligning bearings can 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.

Weidou Intelligent Technology professionally sells German RENK plain bearings, RENK rolling bearings, RENK spherical plain bearings, RENK deep groove ball bearings, RENK angular contact ball bearings, RENK self-aligning ball bearings, RENK thrust ball bearings, RENK double-direction thrust angular contact ball bearings, RENK combination bearings, RENK thrust roller bearings, RENK needle roller bearings, RENK insert ball bearings, RENK self-aligning roller bearings, RENK flanged bearings, RENK linear bearings. All are original imports from Germany. Welcome customers to inquire and order.