THK’s Spherical Plain Bearing Double Split Outer Ring Model SB SERIES represents a significant advancement in articulating joint technology, engineered to accommodate misalignment, oscillating movements, and heavy loads in demanding mechanical systems. This series features a uniquely designed double split outer ring that simplifies installation and maintenance while enhancing operational reliability. The bearing consists of a spherical sliding surface between the inner ring and outer ring, manufactured from high-carbon chromium bearing steel (SUJ2) for the inner ring and medium carbon steel (S45C) for the outer ring, with surfaces hardened to HRC 58-64 to resist wear and deformation. A key technical feature is the inclusion of a PTFE-based liner on the spherical sliding surface, which provides a low coefficient of friction, self-lubricating properties, and resistance to seizure, even under poor lubrication conditions. The double split design allows for easy assembly and disassembly without the need for axial displacement, making it ideal for applications where space constraints or shaft configurations complicate bearing mounting.

Performance advantages of the SB SERIES include exceptional load capacity, with the ability to handle radial loads, axial loads, and moment loads simultaneously, thanks to its spherical geometry. The PTFE liner ensures smooth rotational and sliding motion, reducing friction-induced heat and energy loss, which contributes to longer service life and reduced maintenance intervals. This bearing is also highly resistant to contamination and corrosion when specified with appropriate seals or surface treatments, such as phosphate coating for improved run-in performance. Its design accommodates misalignment angles up to several degrees, compensating for shaft deflections or mounting inaccuracies without sacrificing performance. These attributes make the SB SERIES a robust solution for high-stress environments where reliability and durability are paramount.

Typical applications span a wide range of industrial machinery, automotive systems, and precision equipment. In industrial settings, these bearings are commonly used in construction machinery, such as excavator booms and crane joints, where they endure shock loads and variable alignment. Automotive systems benefit from their use in steering linkages, suspension components, and transmission supports, providing smooth articulation and load distribution in vehicles subjected to rough terrain or heavy payloads. Precision equipment applications include robotics arms, printing presses, and semiconductor manufacturing tools, where the low-friction, maintenance-free operation ensures accurate positioning and reduced downtime. The SB SERIES’ versatility and engineered features make it a critical component in enhancing the efficiency, longevity, and performance of machinery across diverse sectors, supporting everything from heavy-duty industrial operations to high-precision technological applications.