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KR46 Motor wrap

The THK LM Guide Actuator KR46 (full ball type) with motor wrap represents a high-performance integrated linear motion solution engineered for demanding industrial applications. This actuator combines a precision LM guide mechanism with a fully enclosed ball screw drive system and an integrated servo motor, creating a compact, self-contained unit capable of delivering exceptional accuracy, rigidity, and longevity. The defining “full ball type” design features a recirculating ball circuit that provides uniform load distribution across all rolling elements, significantly enhancing load capacity and moment rigidity compared to standard designs. The KR46 model is specifically engineered with a robust housing that fully wraps and protects the motor, screw, and guideway from environmental contaminants such as dust, chips, and moisture, ensuring reliable operation in harsh manufacturing environments.

Key technical features of the KR46 actuator include its high-rigidity LM guide block with four rows of balls for superior load-bearing capacity in all directions—radial, reverse-radial, and lateral. The precision-ground ball screw offers high positioning accuracy and repeatability, while the pre-loaded ball nut minimizes backlash for precise motion control. The integrated servo motor is matched to the drive system for optimal performance, eliminating the need for external couplings and alignment. The unit is pre-lubricated for maintenance-free operation over extended periods and is available with various options, including different accuracy grades, screw leads, and motor specifications to suit specific application requirements. Seals and wipers are strategically placed to protect the critical rolling surfaces from particulate ingress, further enhancing the system’s service life.

Performance advantages are substantial, starting with high-speed capability and smooth, low-friction motion that results in improved cycle times and energy efficiency. The high rigidity of the system minimizes deflection under load, enabling precise positioning even during high-force operations. The integrated design simplifies machine assembly, reduces the overall footprint, and eliminates alignment issues common with traditional component-based systems. This leads to reduced installation time and cost. The durability of the full ball type construction ensures a long operational life with minimal maintenance, providing excellent total cost of ownership. The motor wrap design not only protects the motor but also contributes to a cleaner and safer machine design by containing moving parts and reducing noise.

Typical applications for the THK KR46 LM Guide Actuator are found across industries requiring robust and precise linear motion. In industrial machinery, it is extensively used in automated assembly lines, precision machining centers for tool positioning, pick-and-place robots, and high-speed material handling systems. Within the automotive manufacturing sector, these actuators drive operations in welding robots, precision part transfer systems, and automated inspection equipment where reliability and accuracy are paramount. For precision equipment, the KR46 is ideal for applications such as semiconductor manufacturing machinery, medical device automation, and optical positioning systems where smooth motion, high repeatability, and contamination resistance are critical to process success.

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Short nut Block C-D with Cover SERIES
The THK LM Guide Actuator KR46 series represents a fully integrated linear motion solution, combining a precision LM Guide with a high-efficiency ball screw actuator in a compact, motor-wrap design. This full ball type configuration ensures optimal load distribution and smooth motion characteristics. The system features a short nut block design (types C and D available with protective covers) that minimizes overall length while maintaining high rigidity and torque capacity. Engineered for direct motor mounting without additional couplings, the actuator achieves exceptional positioning accuracy through its ground ball screw and precision-guided carriage assembly. Key technical features include the full-ball recirculation system in both the guide and screw assemblies, providing uniform load distribution across all rolling elements. The KR46’s compact motor-wrap design integrates the drive motor directly with the actuator, eliminating alignment issues and reducing installation space requirements. The short nut block configuration maintains high rigidity while minimizing the actuator’s overhang length. Protective covers on series C and D models prevent contamination from dust, chips, and other particulate matter, ensuring long-term reliability in harsh environments. The system offers multiple preload options to match specific application requirements for stiffness and precision. Performance advantages stem from this integrated design approach. The direct motor coupling eliminates backlash associated with traditional coupling methods, resulting in higher positioning accuracy and repeatability. The full-ball construction provides higher load capacities in all directions – radial, reverse-radial, and lateral – compared to standard designs. With precision-ground ball screws achieving grades C3 to C5, the actuator delivers exceptional positioning accuracy down to micrometers per 300mm travel. The optimized recirculation system reduces noise levels during operation while maintaining high-speed capability. These actuators demonstrate minimal maintenance requirements thanks to their sealed construction and long-term lubrication options. Typical applications span multiple industries where precision motion and reliability are critical. In industrial machinery, these actuators serve as key components in CNC machining centers for tool changing mechanisms, precision grinding machines for workpiece positioning, and semiconductor manufacturing equipment requiring micron-level accuracy. Automotive production systems utilize them in automated welding guns, robotic assembly arms, and precision testing equipment. The KR46 series finds particular application in electronic component manufacturing for PCB drilling machines, pick-and-place systems, and laser processing equipment where its compact design and high accuracy provide significant advantages. Additional implementations include medical device assembly systems, optical instrument positioning stages, and automated inspection equipment where smooth motion and precise positioning are essential for operational success.
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Short nut Block C-D SERIES
The THK LM Guide Actuator KR46, a full ball type linear motion system, integrates a precision LM Guide with a ball screw actuator into a compact, high-rigidity unit. This specific model, part of the Motor wrap Short nut Block C D SERIES, is engineered for applications demanding high load capacity, exceptional accuracy, and smooth, high-speed motion. The system's defining characteristic is its "full ball" recirculation design within both the guide and the screw nut, ensuring a large number of load-carrying balls are constantly in contact, which directly translates to superior stiffness, high load ratings, and prolonged service life. Key technical features of the KR46 actuator begin with its robust construction. The LM Guide block and the ball screw nut are housed within a single, rigid block, eliminating alignment issues and creating an exceptionally stable platform. The guide mechanism utilizes a full-complement ball circuit, providing high rigidity in all directions—radial, reverse-radial, and lateral—making it highly resistant to moment loads. The integrated ball screw employs a "short nut" design with a lead error accuracy of C5 or better, contributing to precise positional repeatability. The compact "Motor wrap" design facilitates a space-saving direct coupling with servo motors, streamlining the overall assembly and reducing the system's footprint. Pre-loaded ball elements within both the guide and the nut eliminate internal clearance, ensuring zero backlash and smooth, non-stick-slip motion right from startup. The performance advantages of this design are substantial. The high rigidity and large load capacity allow the KR46 to handle significant forces and moments, making it suitable for demanding applications where other guides might deflect. The optimized recirculation system and high-grade materials minimize friction and wear, enabling high-speed operation while maintaining quiet performance and achieving a long, maintenance-free service life. The combination of the precision ball screw and the pre-loaded guide results in exceptional positioning accuracy and repeatability, which is critical for automated processes. Its compact, all-in-one design simplifies machine design, reduces the number of components, and accelerates installation. Typical applications for the THK KR46 LM Guide Actuator are found across industries requiring robust and precise linear motion. In industrial machinery, it is ideally suited for the axes of heavy-duty CNC machining centers, high-speed transfer lines in automated production systems, and as the primary drive in precision assembly robots. Within the automotive manufacturing sector, it performs reliably in welding gun manipulators, heavy part positioning fixtures, and automated quality inspection stations. For precision equipment, its high accuracy and stability make it an excellent choice for semiconductor manufacturing apparatus, such as wafer handling and testing systems, as well as in the critical stages of LCD panel production. This actuator provides a complete, high-performance solution for engineers designing machinery where structural integrity, precision, and long-term reliability are non-negotiable.
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Long nut Block A-B with Cover SERIES
The THK LM Guide Actuator KR46 series represents a high-performance linear motion solution integrating a precision LM guide with a ball screw drive mechanism in a compact, unified assembly. This full ball type design ensures optimal load distribution and smooth motion by utilizing a complete ball recirculation system in both the guide and screw sections. The actuator features a motor wrap configuration, where the motor is mounted parallel to the axis, coupled via a timing belt for efficient power transmission and space savings. It includes a long nut block—available in variations A and B—with an integrated cover to protect the ball screw from contaminants and retain lubrication, enhancing durability in demanding environments. Key technical features include the full ball recirculation in the LM guide, which provides high rigidity and load capacity in all directions: radial, reverse-radial, and lateral. The KR46’s long nut design increases the number of loaded balls in the screw assembly, distributing stress more evenly and allowing for higher dynamic and static load ratings. The guide rails and blocks are manufactured with high-precision grinding, ensuring smooth, low-friction movement and minimal positional deviation. The motor wrap arrangement simplifies installation by aligning the motor alongside the actuator, reducing overall length and enabling easier integration into machinery with spatial constraints. The protective cover on the nut block is essential for excluding dust, chips, and moisture, which is critical for maintaining accuracy and extending service life. Performance advantages of the KR46 series are substantial, offering exceptional positioning accuracy and repeatability due to the precision-ground components and optimized preload adjustment. The full ball type construction minimizes friction, resulting in lower heat generation and energy consumption, while enabling high-speed operation without sacrificing stability. Its high rigidity reduces deflection under load, ensuring consistent performance in applications involving heavy loads or moment forces. The long nut and increased ball count enhance the ball screw’s fatigue life, reducing maintenance needs and downtime. Additionally, the motor wrap design allows for flexible motor selection and simplifies alignment, contributing to quicker assembly and system tuning. Typical applications span various industries where reliable, precise linear motion is critical. In industrial machinery, the KR46 actuator is employed in CNC machining centers for tool changers, automated pallet systems, and material handling equipment, where high load capacity and accuracy are paramount. Within automotive manufacturing, it facilitates precise positioning in welding robots, assembly line transporters, and testing apparatus that demand durability and repeatability. In precision equipment, such as semiconductor manufacturing devices, optical alignment systems, and medical automation, the actuator’s low vibration and smooth operation ensure micron-level accuracy. Its robust design with protective covers makes it suitable for harsh environments, including those with particulate contamination or requiring frequent washdowns, ensuring long-term reliability and performance consistency.
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Long nut Block A-B SERIES
The THK LM Guide Actuator KR46 series represents a fully integrated linear motion solution that combines a precision LM Guide with a high-efficiency ball screw actuator in a compact, rigid unit. This full ball type configuration ensures optimal load distribution and smooth motion characteristics across industrial applications. The actuator features a motor wrap design that seamlessly integrates servo or stepper motors, minimizing overall footprint while maintaining high torque transmission efficiency. Its long nut block design—available in both A and B series configurations—provides enhanced rigidity and load capacity through increased ball screw engagement length, making it particularly suitable for applications requiring high moment load resistance and precise positioning repeatability. Key technical features include the full ball recirculation system in both the guide and screw sections, which maximizes contact area for higher load ratings and longer service life. The KR46’s rail and block are manufactured from hardened steel with precision grinding, ensuring minimal friction and consistent performance under heavy loads. The long nut block design significantly reduces deflection during operation, maintaining alignment accuracy even under asymmetric loading conditions. Sealing systems integrated into the block provide robust protection against contaminants like dust, chips, and splashing fluids, making the actuator suitable for harsh manufacturing environments. Pre-loaded ball assemblies eliminate backlash, while the optimized ball groove geometry minimizes noise and vibration during high-speed operation. Performance advantages of the KR46 series stem from its integrated design, which eliminates alignment issues common in separately assembled systems. The actuator delivers positioning accuracy within micron-level tolerances and maintains this precision across its entire stroke length. Its high rigidity enables accelerated motion profiles without sacrificing stability, reducing cycle times in automated processes. The full ball type construction provides higher load capacity compared to standard designs, with the KR46 supporting moment loads up to 40% greater than equivalent sized competitors. Efficiency gains are realized through the reduced number of components and simplified mounting requirements, cutting installation time and maintenance overhead. Typical applications span multiple industries where precision linear motion is critical. In industrial machinery, the KR46 series is deployed in CNC machining centers for tool changing mechanisms, semiconductor manufacturing equipment for wafer handling robots, and packaging machinery for high-speed pick-and-place operations. Automotive production lines utilize these actuators in welding gun positioning systems, assembly robots, and precision testing equipment. The precision equipment sector employs KR46 actuators in medical device manufacturing, optical alignment systems, and coordinate measuring machines where smooth motion and accurate positioning are paramount. The long nut block configuration makes it particularly valuable in vertical applications such as Z-axis drives where gravitational forces create constant moment loads, ensuring maintained accuracy throughout extended operational cycles.
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