German WINKEL bearings, WINKEL models, WINKEL prices

WINKEL roller bearings with cylindrical rollers; relative to their diameter, the rollers are both thin and long. These rollers are called needle rollers. Despite having a small cross-section, the bearings still exhibit 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 minimized, 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 equivalent to bearings with rings, the hardness, machining precision, and surface quality of the raceway surfaces on the shaft or housing bore should be similar to those of the bearing rings. This type of bearing can only withstand radial loads.

WINKEL bearing function and structure

Supports rotating shafts and components on the shaft, maintaining the normal working position and rotational accuracy of the shaft. Rolling bearings are easy to use and maintain, reliable in operation, have good starting performance, and offer high load capacity at medium speeds. Compared to plain bearings, rolling bearings have larger radial dimensions, poorer vibration damping capabilities, shorter service life at high speeds, and generate more noise. The structure of a rolling bearing consists of the following parts: 1) Outer ring – installed in the bearing housing bore, generally does not rotate; 2) Inner ring – installed on the shaft journal, rotates with the shaft; 3) Rolling elements – the core components of the rolling bearing; 4) Cage – separates the rolling elements evenly to prevent friction. Lubricant is also considered the fifth major component of rolling bearings, primarily serving functions such as lubrication, cooling, and cleaning.

WINKEL bearing features

1). Significant energy savings. Due to the motion characteristics of rolling bearings themselves, their friction is far less than that of plain bearings, reducing power consumption lost to frictional resistance, thus achieving significant energy savings. From theoretical analysis and production practice, main bearings using rolling bearings in general small ball mills can save electricity by 30%~35%, medium-sized ball mills save electricity by 15%~20%, and large ball mills can save electricity by 10%~20%. Since ball mills themselves are major energy consumers in production, this means considerable cost savings can be achieved. 2). Easy maintenance and reliable quality. Using rolling bearings eliminates complex maintenance processes with high technical requirements, such as smelting, casting, and scraping Babbitt metal, as well as oil supply and water cooling systems, significantly reducing maintenance workload. Moreover, since rolling bearings are manufactured by specialized producers, their quality is often guaranteed, bringing convenience to ball mill users.

WINKEL bearing lubrication

Mainly includes grease lubrication and oil lubrication. Grease lubrication is less prone to leakage, easier to seal, has a longer service life, is simple to maintain, and provides high oil film strength, but the friction torque is higher than with oil lubrication, making it unsuitable for high-speed applications. The amount of grease filled in the bearing should not exceed 1/2～1/3 of the bearing space; otherwise, excessive stirring of the lubricant will cause the bearing to overheat. Oil lubrication offers good cooling effects, but the sealing and oil supply devices are more complex. The viscosity of the oil is generally 0.12～0.2 cm²/s. High-viscosity oil is recommended for heavy loads and high operating temperatures, while low-viscosity oil is suitable for high speeds. Lubrication methods include oil bath lubrication, drip oil lubrication, oil mist lubrication, spray oil lubrication, and pressure oil supply lubrication. For oil bath lubrication, the oil level should not be higher than the center of the lowest rolling element. If the bearing is designed and the lubricant viscosity is selected according to elastohydrodynamic lubrication theory, the contact surfaces will be separated by an oil film. In this case, under stable load conditions, the bearing life can be increased manyfold. Modern machinery, instruments, and other equipment are developing towards high speed, heavy load, precision, and lightweight designs, posing many new requirements for rolling bearings, such as maintaining or even increasing rated loads while reducing size, adopting new technologies to improve processes, enhancing manufacturing precision, and lowering costs. General-purpose rolling bearings can hardly meet various diverse requirements; for mass-produced machinery and equipment, specialized bearings should be designed and manufactured. While strengthening standardization, varieties should be increased, and the proportion of specialized bearings expanded. The development of modern industry also requires special bearings for operation under special conditions, such as bearings working at high speeds, high temperatures, low temperatures, strong magnetic fields, or in media such as acids and alkalis.

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