Crossed Roller Bearings in Automation Equipment Robot Joints

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Crossed Roller Bearings in Automation Equipment Robot Joints

In robot joints, angular deflection at the bearing turns into position error at the tool tip. Crossed roller bearings in automation equipment robot joints hold each axis rigid while the arm accelerates, reverses, and carries an off-center payload at the end of a long reach. The rollers sit at right angles inside integrated one-piece rings, so a single bearing carries radial load, axial load, and tilting moment without the stack height of a paired arrangement.

Deflection is the reason stiffness matters more here than anywhere else on an automation line. Runout at a shoulder or elbow joint multiplies through every link that follows it, so a small angular error at the base becomes a large positioning error at the gripper. Line contact between the rollers and the raceways spreads the load across a wide area, keeping that deflection low. Factory-set preload removes internal clearance before the joint is assembled, so the axis resists from the first increment of load and does not drift when the arm changes direction. Available accuracy grades let each joint be matched to the repeatability the cell demands.

Yuanhe manufactures crossed roller bearings for articulated arms, collaborative robots, and industrial robot joints. Our RAU integrated ring construction and factory preload deliver repeatable positioning, simple mounting, and long service life across millions of duty cycles, helping robot builders hold their repeatability spec without adding bearings or on-site adjustment to the joint. The same series supports the rest of the cell, from indexers to positioning stages, as covered on our automation equipment page.

Yuanhe delivers precision and repeatability in robot joints

• Line contact resists the tilting moment of a loaded arm, keeping tool tip deflection low
• Factory-set preload removes backlash, so the joint does not drift when the arm reverses direction
• RAU integrated one-piece rings hold the raceways true across millions of duty cycles
• One bearing carries radial load, axial load, and moment, saving stack height in a compact joint housing
• Large bore relative to outside diameter leaves room for wiring and harness routing through the joint centre
• Sealed designs protect the grease through years of shift work with no scheduled re-greasing

Bearing Demands by Joint Position

Each joint positions the arm rather than simply spinning a shaft, which is what a crossed roller bearing is built for. The servo motors and gear stages that drive those joints still run on deep groove ball bearings, where speed and low friction matter more than moment stiffness. Selection detail for each joint is covered in our guide to crossed roller bearings for robot joints.

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