What is the most common bearing found in main reduction gears (MRGs)?

The most common bearing found in main reduction gears (MRGs) is the sleeve-type bearing. Sleeve bearings, also known as plain bearings or journal bearings, are selected for their ability to handle the significant loads and varying speeds that are typically encountered in MRG applications. They provide a large surface area for load distribution, which is crucial in reducing wear and maintaining the integrity of the gear system over time.

Sleeve-type bearings excel in environments where high levels of lubrication are present, as they rely on a film of lubricant between the sliding surfaces to minimize friction and prevent direct metal-to-metal contact. The design allows for the absorption of vibrations and shocks, which is vital for the smooth operation of main reduction gears in machinery.

In contrast, ball-type bearings, while effective in various applications, are generally more suited for high-speed or low-load conditions rather than the heavy load scenarios often found in MRG systems. Cylindrical-type bearings can be used for certain applications but are not as commonly employed in this particular context as sleeve bearings. Pillow-block bearings are usually used for supporting shafts but are not directly applied in gear systems like MRGs.

Overall, sleeve-type bearings’ characteristics make them well-suited for the operational demands of main reduction gears, leading to