The THK Ball Spline LBG series represents a sophisticated integration of linear motion and torque transmission capabilities in a single compact unit. This full-ball type ball spline with rotary gears is engineered to simultaneously accommodate linear movement and rotational torque, eliminating the need for separate components and complex assemblies. The LBG design features a spline shaft with precision-ground grooves that engage with a nut containing recirculating balls, while integrated gears on the nut exterior provide positive rotational drive. This dual-function design achieves smooth linear motion along the shaft axis while transmitting substantial torque through the gear mechanism.

Technical specifications reveal several critical advantages. The full-ball contact configuration between the balls and spline grooves ensures minimal backlash and consistent torque transmission throughout the linear travel range. Precision grinding of both the spline grooves and gear teeth maintains tight tolerances, typically within microns, for accurate positioning and smooth operation. The LBG series incorporates THK’s proprietary Caged Ball technology, which separates individual balls with a resin cage to prevent contact and reduce noise during operation. This design also allows for higher speeds compared to conventional ball splines while maintaining lubrication integrity. The gears are manufactured with optimized tooth profiles to maximize contact area and load distribution, available in various module sizes to match torque requirements.

Performance characteristics demonstrate why this component excels in demanding applications. The simultaneous linear and rotary motion capability reduces overall system size and weight while improving response times. High rigidity enables precise positioning under combined loads, with dynamic load ratings reaching several kilonewtons depending on model size. The efficient recirculation system maintains consistent friction characteristics across the entire stroke length, contributing to predictable motion control. Sealing systems protect the ball tracks from contamination while retaining lubrication, extending service intervals in harsh environments. Thermal stability remains high due to the symmetrical design that minimizes thermal expansion effects on accuracy.

Industrial implementations span multiple sectors where synchronized linear and rotary motions are essential. In automotive manufacturing, LBG units drive welding gun positioning systems that require both approach movements and rotational adjustment for optimal weld angles. Robotics integrators utilize these components in articulated arm joints where compactness and weight reduction are critical while maintaining precise path control. Semiconductor equipment manufacturers employ LBG splines in wafer handling robots that must coordinate vertical lifting with rotational orientation within cleanroom environments. Packaging machinery incorporates these units for product transfer operations involving both linear indexing and rotational positioning. Medical device manufacturers specify LBG series for diagnostic equipment requiring precise linear scanning motions combined with probe rotation. The design’s versatility also extends to aerospace applications where actuator systems benefit from the reduced component count and increased reliability.

Maintenance considerations focus on the integrated lubrication system, with recommended intervals varying based on operating conditions. Standard models operate effectively across temperature ranges from -10°C to 80°C, with high-temperature variants available for extreme environments. Installation requires careful alignment of both the spline shaft and gear engagement to optimize performance and service life. The LBG series represents a comprehensive solution for applications demanding coordinated linear and rotary motion in a single robust package.