German IEM bearings IEM models IEM prices

IEM 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 and provides 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 even distribution of the rolling elements, guides the rolling elements to rotate, and provides lubrication.

IEM bearing function and structure

Supports the rotating shaft 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 with plain bearings, rolling bearings have larger radial dimensions, poorer damping capacity, shorter service life at high speeds, and greater 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 component 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.

IEM bearing features

1). Significant energy savings. Due to the motion characteristics of rolling bearings, their friction is far lower than that of plain bearings, reducing power consumption caused by frictional resistance, thus achieving significant energy savings. Theoretical analysis and production practice show that small ball mills using rolling bearings as main bearings can save 30%~35% of electricity, medium-sized ball mills can save 15%~20%, and large ball mills can save up to 10%~20%. Since ball mills are major energy consumers in production, this means considerable cost savings. 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, greatly reducing maintenance workload. Moreover, since rolling bearings are manufactured by specialized producers, their quality is often guaranteed, bringing convenience to ball mill users.

IEM bearing lubrication

Mainly 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 offers 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 to 1/3 of the bearing space; otherwise, excessive stirring of the lubricant will cause the bearing to overheat. Oil lubrication provides good cooling effects, but the sealing and oil supply devices are more complex. The viscosity of the oil is generally 0.12 to 0.2 cm²/s. High-viscosity oil is suitable 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, the bearing service life can be increased many times. Modern machines, instruments, and other equipment are developing towards high speed, heavy load, precision, and light weight, which puts forward many new requirements for rolling bearings, such as maintaining or even increasing the rated load while reducing size, adopting new technologies to improve processes, improving manufacturing precision, and reducing costs. General-purpose rolling bearings can hardly meet various requirements; for mass-produced machinery and equipment, special bearings should be designed and manufactured. While strengthening standardization, varieties should be increased, and the proportion of special bearings should be expanded. The development of modern industry also requires special bearings that work under special conditions, such as bearings operating at high speed, high temperature, low temperature, strong magnetic fields, or in media such as acids and alkalis.

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