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Cross-Roller Bearing – Double-Row Angular Contact Ring

THK Cross Roller Bearings represent a pinnacle of precision engineering in linear motion technology, designed to handle complex load scenarios with exceptional rigidity and accuracy. These bearings feature a unique cylindrical roller arrangement where adjacent rollers are oriented at right angles to each other in a single compact unit. This cross-roller configuration enables the bearing to simultaneously support radial, axial, and moment loads without requiring multiple bearing assemblies. The rollers make line contact with the raceways, distributing stress evenly across the bearing surfaces while maintaining minimal elastic deformation under load. Manufactured from high-grade chromium steel and subjected to THK’s proprietary heat treatment processes, these components achieve superior hardness and wear resistance. The inclusion of precision-ground spacers between rollers ensures consistent roller spacing and prevents sliding friction, while integrated sealing mechanisms protect against contamination in harsh operating environments.

The performance advantages of THK Cross Roller Bearings stem directly from their innovative design characteristics. Their compact cross-roller arrangement delivers significantly higher rigidity compared to conventional ball bearings, with rotational accuracy typically within 1 to 5 microns depending on the precision grade. This enhanced rigidity minimizes deflection under load, making them ideal for applications requiring precise positioning and repeatability. The optimized contact geometry between rollers and raceways results in smooth motion characteristics with minimal friction variation throughout the rotation cycle. These bearings exhibit exceptionally low starting and running torque while maintaining consistent rotational performance across varying speed ranges. Their space-saving design consolidates multiple bearing functions into a single compact unit, reducing overall system complexity and installation requirements. The high load capacity-to-size ratio allows for more streamlined machine designs without compromising performance, while the reduced number of components decreases potential failure points and simplifies maintenance protocols.

In industrial automation, THK Cross Roller Bearings serve as critical components in robotic arm joints, rotary tables, and indexing mechanisms where precise angular positioning is paramount. Their ability to handle combined loads makes them indispensable in machine tool applications, particularly in rotary pallet changers, tilting spindles, and rotary grinding attachments. The automotive manufacturing sector utilizes these bearings in welding robot positioning units, automated assembly fixtures, and precision testing equipment requiring high moment load capacity. Within semiconductor and electronics production, they enable the precise motion control essential for wafer handling robots, wire bonding machines, and inspection system stages. Medical equipment manufacturers incorporate these bearings into CT scanner gantries, surgical robot articulation points, and laboratory automation systems where smooth, accurate rotation is critical. Optical instrument manufacturers rely on them for precision rotary stages in measuring devices, telescope positioning systems, and laser processing equipment, leveraging their minimal rotational error and vibration damping characteristics to achieve sub-micron level accuracy in demanding applications.

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Contact Roller Ring RW SERIES
The THK Cross Roller Bearing Contact Roller Ring RW SERIES represents a specialized class of linear motion components engineered for applications demanding the highest levels of rotational accuracy, rigidity, and compactness. This series functions as a highly integrated bearing unit, where cylindrical rollers are arranged in a crossed pattern between a monolithic outer ring and two inner rings. This unique V-groove cross-roller construction allows the bearing to simultaneously support complex load combinations—including radial, axial, and moment loads—with a single, compact unit. The fundamental design eliminates the need for multiple, separately mounted bearings, simplifying assembly and ensuring exceptional structural integrity. Key technical features define the superior performance of the RW SERIES. The precision-ground rollers make point contact with the raceways, significantly reducing rotational torque and frictional resistance, which is critical for smooth, low-vibration operation. The use of a one-piece outer ring and precision spacers between the rollers guarantees consistent, high-accuracy rotation by maintaining exact roller pitch and preventing skewing. This construction results in exceptionally high rigidity, minimizing elastic deformation under heavy or moment loads. Furthermore, the series is available with various sealing options to protect the precision-ground components from contaminants like dust and moisture, thereby ensuring long-term reliability and consistent performance in demanding environments. Optional configurations include flanged and non-flanged types, as well as units with pre-drilled mounting holes, offering significant design flexibility for integration into diverse mechanical systems. The performance advantages of the RW SERIES translate directly into enhanced machine capability. Its compact design allows for the creation of more streamlined and space-efficient machinery without sacrificing load capacity or accuracy. The high rigidity ensures minimal deflection, which is paramount for maintaining precision in positioning and machining operations. The low torque and smooth rotation contribute to higher operational speeds, reduced power consumption, and decreased heat generation, leading to greater overall energy efficiency and system longevity. These attributes make the RW SERIES an enabling technology for applications where precision and reliability are non-negotiable. Typical applications for the THK RW SERIES are found across high-precision industrial sectors. In industrial automation and robotics, these bearing rings are indispensable in the rotary joints of robotic arms, indexing tables for precision assembly, and the pivoting mechanisms of automated guided vehicles (AGVs), where they provide the critical combination of compact size, high moment load capacity, and flawless rotational smoothness. Within the realm of precision equipment, they are integral to the rotary stages of semiconductor manufacturing equipment, such as wafer steppers and inspection machines, and are fundamental to the high-accuracy rotation of medical imaging devices like CT and MRI scanners. In specialized automotive manufacturing and testing systems, the RW SERIES is utilized in precision jigs and fixtures, rotary actuators, and advanced dynamometer systems that require unwavering accuracy and durability under continuous operation.
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Cross-Roller Bearing
THK Cross Roller Bearings represent a specialized category of linear motion components engineered to deliver exceptional precision, rigidity, and load-bearing capacity in compact, space-saving designs. These bearings feature a unique construction where cylindrical rollers are arranged perpendicularly to one another in a single unit, separated by spacers or integral ribs on the inner or outer ring. This cross-roller configuration allows the bearing to simultaneously support radial, axial, and moment loads with high accuracy and minimal elastic deformation. Unlike conventional ball bearings or separate combinations of radial and thrust bearings, the THK Cross Roller Bearing integrates multi-directional load handling into one efficient assembly, significantly reducing the complexity and size of the overall mechanism. Key technical features include the use of high-grade, heat-treated steel for rollers and raceways to ensure durability and long service life under demanding conditions. The rollers are precision-ground to tight tolerances, promoting smooth, low-friction rotation and minimizing vibration and noise. Many models incorporate sealing mechanisms to protect against contaminants like dust, chips, and moisture, enhancing reliability in harsh environments. Optional pre-load adjustments enable fine-tuning of bearing clearance, optimizing stiffness and rotational accuracy for applications requiring zero backlash. The compact cross-section of these bearings makes them ideal for installations where space is at a premium, without sacrificing performance. Performance advantages of THK Cross Roller Bearings are evident in their high rigidity and positional accuracy, which contribute to improved repeatability and stability in motion control systems. Their ability to handle complex load combinations reduces the need for additional support components, simplifying design and lowering overall costs. The low-friction operation ensures efficient power transmission and reduced heat generation, leading to higher operational speeds and extended maintenance intervals. These bearings exhibit excellent resistance to wear and fatigue, maintaining precision over long periods even in high-cycle applications. Typical applications span a wide range of industries, leveraging these advantages in critical roles. In industrial machinery, THK Cross Roller Bearings are commonly found in the rotary tables of machining centers, where they support heavy workpieces while enabling precise indexing and contouring. They are integral to robotic arms and automation equipment, providing the rigidity needed for accurate positioning and smooth articulation in assembly and welding processes. Within automotive systems, these bearings are used in precision steering mechanisms, testing equipment, and electric vehicle battery manufacturing lines, where reliability and compactness are paramount. In precision equipment, they serve as core components in medical devices such as CT scanners and surgical robots, semiconductor manufacturing tools like wafer handlers, and optical instruments including measuring devices and telescope mounts, ensuring flawless performance where minute inaccuracies are unacceptable.
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