The PRS XRBU series crossed roller bearing is a precision rotary support bearing featuring a high-precision crossed cylindrical roller configuration. Designed with an integrated inner and outer ring structure and pre-drilled mounting holes, it is capable of simultaneously accommodating radial loads, bidirectional axial loads, and overturning moments within a relatively compact installation space.
The PRS XRBU series crossed roller bearing is a precision rotary support bearing featuring a high-precision crossed cylindrical roller structure. Designed with integrated inner and outer rings and pre-drilled mounting holes, it can simultaneously accommodate radial loads, bidirectional axial loads, and overturning moments within a relatively compact installation space. It is ideally suited for industrial equipment that demands high rotational accuracy, structural rigidity, and assembly stability.
The XRBU series utilizes cylindrical rollers arranged in a crossed configuration, where the axes of adjacent rollers are oriented at a 90° angle to one another. The line contact between the rollers and the raceways allows the bearing to distribute combined loads across rollers oriented in different directions, thereby ensuring high structural rigidity and rotational stability.
Unlike traditional configurations that require multiple bearings to handle combined loads, the XRBU series can manage loads from various directions using a single crossed roller bearing. This simplifies the rotary support system and reduces the space required for installation.
Featuring an integrated inner and outer ring design with built-in mounting holes, the XRBU series can be attached directly to the rotating components and stationary structures of a machine. This eliminates the need for additional flanges or complex support assemblies, enhancing the overall structural integration of the equipment.
In the current PRS product portfolio, the XRBU series is categorized as an ultra-thin, precision crossed roller bearing with integrated mounting holes, primarily designed for applications in robotics, aerospace equipment, and precision instruments.
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The XRBU series features an integrated inner and outer ring design. Unlike some crossed roller bearings that utilize split rings, these continuous, solid rings help maintain the structural integrity of both the bearing raceways and the overall mounting assembly.
When installed correctly and with precise control over fit tolerances, this configuration meets the stringent requirements for support rigidity and operational stability in precision rotating equipment.
The cylindrical rollers within the bearing are arranged alternately along the circumference, with the axes of adjacent rollers positioned perpendicular to one another. This crossed configuration enables the bearing to accommodate loads from multiple directions simultaneously.
Unlike standard radial bearings, crossed roller bearings can support radial forces, bidirectional axial forces, and overturning moments, making them ideal for equipment where the rotating support is subjected to complex, combined loading.
XRBU bearings utilize a design where cylindrical rollers make line contact with their corresponding raceways. Compared to rolling elements that rely on point contact, this line-contact structure provides higher contact rigidity under appropriate load distribution.
The actual load-carrying capacity is determined by factors such as roller dimensions and quantity, raceway geometry, material properties, heat treatment, and the internal design of the bearing.
A key feature of the XRBU series is the inclusion of mounting holes in both the inner and outer rings, allowing for direct attachment to equipment based on specific hole patterns.
This design simplifies the mounting structure, making it particularly well-suited for applications with limited space where the rotating support component must be mounted directly.
The rotational accuracy of the bearing depends not only on the manufacturing precision of the rings and rollers but also on internal clearance, the level of preload, the accuracy of the mounting surfaces, and the tightening status of the connecting bolts.
Through proper bearing selection and installation design, the XRBU series provides a stable support foundation for precision rotating mechanisms.
