RU crossed roller bearing

Design principle: The integral structure of the inner and outer rings reduces assembly errors, and the built-in mounting holes (PCD) are suitable for bolt fixing. The rollers are arranged orthogonally and evenly spaced by a nylon cage to reduce sliding friction. Performance characteristics: High load-bearing capacity: The basic dynamic load rating (Cr) can reach up to 222 kN at most (such as the RU 445 model). Convenient installation: The pre-installed mounting holes (PCD) support rapid positioning and fixing. Long service life: The surface of the GCr15 material is hardened, and the fatigue life is increased by 25%.

Roller Arrangement and Load Distribution The rollers are arranged orthogonally, forming perpendicular contact lines on the raceways, thus constructing a stable mechanical support network. When subjected to a radial load, the crossed layout enables the rollers to disperse the force onto the inner and outer ring raceways, avoiding single - point stress concentration. Under an axial load, the rollers can evenly receive and transmit the force, maintaining axial stability. In the face of a moment load, the rollers ingeniously disperse the moment through diagonal contact, enabling the bearing system to stably cope with complex forces and ensuring the smooth operation of the equipment. Lubrication and Sealing Grease Lubrication: High - quality complex lithium-based grease is filled during manufacturing. Under normal operating conditions, it effectively reduces friction and minimizes wear between the rollers and the raceways. In special environments such as high - temperature or vacuum, long - acting special lubricating greases like Krytox® can be selected to meet the lubrication requirements. Oil Lubrication: For high-speed or heavy-load scenarios, a circulating oil lubrication system is preferred. The circulating oil can not only dissipate the heat generated by friction in a timely manner for cooling but also continuously provide sufficient lubrication to ensure the bearing operates well under extreme conditions. Sealing Design: The RU-series crossed roller bearings offer various sealing options. The open-type design is suitable for clean environments. Although it requires regular external lubrication, it can meet the equipment's special requirements for lightweight and heat dissipation. The contact-type rubber seals (UU/U) fit closely with the bearing components, effectively blocking the intrusion of dust, chips, and other foreign objects in dusty industrial environments. ### Thermal Management The optimized geometric shape of the roller end faces and the low - friction design reduce heat generation at the source. During equipment operation, less heat is generated, effectively controlling the bearing's temperature rise. Meanwhile, the good heat dissipation performance can dissipate a small amount of heat in a timely manner, preventing heat accumulation. This meets the strict requirements of precision instruments for thermal stability, ensuring that the equipment's operating accuracy is not affected by temperature changes.