THK’s Cross Roller Bearing for Outer Ring Rotation, Standard USP Grade Series Model RE SERIES, represents a pinnacle of precision engineering designed for applications demanding high rigidity, exceptional rotational accuracy, and smooth operation under complex load conditions. This bearing features a unique structure where cylindrical rollers are arranged crosswise between the inner and outer rings at a 90-degree angle to each other, with adjacent rollers oriented perpendicularly. This cross-roller arrangement enables a single bearing to simultaneously support radial, axial, and moment loads efficiently, eliminating the need for multiple bearing combinations and simplifying overall mechanical design. The outer ring rotation design is specifically optimized for scenarios where the outer ring is the rotating element, providing enhanced stability and performance.

Key technical features include the use of high-grade steel, precision grinding to USP (Ultra Super Precision) grade tolerances, and a compact, space-saving design. The bearing is engineered with a high number of contact points, which distributes loads evenly and minimizes elastic deformation under stress. This results in significantly higher rigidity compared to conventional bearings. The raceway and rolling surfaces are finished to ultra-smooth levels, reducing friction and enabling precise, low-torque rotation. Optional sealing units are available to protect against contaminants like dust and moisture, extending service life in harsh environments. The RE SERIES is also designed for easy installation, with through-holes in the outer ring facilitating secure mounting.

Performance advantages are substantial, starting with unparalleled rotational accuracy and repeatability, critical for applications requiring fine positioning. The high rigidity ensures minimal deflection under load, maintaining precision even in demanding operational conditions. This leads to improved machine performance, reduced vibration, and quieter operation. The bearing’s efficiency in handling combined loads translates to longer service life and reduced maintenance intervals, lowering total cost of ownership. Its compactness allows for more streamlined machinery designs, saving valuable space without compromising on capability.

Typical applications span across high-precision industries. In industrial machinery, the RE SERIES is ideal for rotary tables on machining centers, indexing heads, industrial robots, and automated assembly systems where precise angular positioning is crucial. Within automotive systems, it finds use in advanced manufacturing equipment, such as welding robot arms and precision testing devices, ensuring reliable performance under high-speed and high-load scenarios. In precision equipment, it is employed in semiconductor manufacturing apparatus, medical devices like CT scanners, and optical instruments, where smooth, accurate rotation is essential for achieving micron-level tolerances and repeatable results. This bearing series is a cornerstone for engineers seeking to enhance the accuracy, reliability, and efficiency of their rotational mechanisms.