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Classification and Codes: Selection of Precision Cross Roller Ring Bearings


Precision cross roller ring bearings often appear in precision production equipment, for example, they can be used in the joints and rotating parts of industrial robots, and in the rotatable tables of machining centers.


Selecting appropriate cross roller ring bearings ensures the stability of equipment operation. Therefore, it is recommended to consider the following points when selecting:


Determine the cross roller ring bearing rotation method and rotational speed


Cross roller ring bearings have different structural forms based on their characteristics. Therefore, it is necessary to confirm whether the motion type of the mechanism is inner ring rotation or outer ring rotation, as well as the rotational speed parameters.


Confirm the installation method of the cross roller ring bearing


The cross roller ring bearing has two conventional installation methods:


Both inner and outer rings have no mounting holes. Installation and positioning are mainly done through the fit between the bearing seat, the clamping flange, and the shaft and bearing inner diameter, which is suitable for equipment with large installation space.


Both inner and outer rings are equipped with mounting holes. Installation is relatively simple and is done by directly connecting them to the equipment with connecting bolts, suitable for compact structures with smaller installation spaces.


Confirm the size range of thecross roller ring bearing


Confirm the allowable size range of the mechanism and the required bearing lifespan. Based on the above two points and the demand for bearings, choose the appropriate bearing size specifications.


Confirm the required precision grade of thecross roller ring bearing


When choosing precision, the rotational accuracy of inner and outer rings, size tolerance, and appropriate precision grade based on equipment working conditions should be considered.


Confirm the rigidity of the cross roller ring bearing


Ensure the required rigidity of the equipment to match the appropriate bearing clearance and the rigidity of the mounting part.


Confirm the torque/overturning moment requirements of the cross roller ring bearing


Rotational torque refers to the rotational torque borne by the bearing during rotation, while overturning torque refers to the torque the bearing can withstand. Determining the requirements for rotational torque can match the internal clearance of the bearing with the corresponding precision grade. Determining the overturning torque the bearing can withstand clarifies the structural form of the bearing.


Confirm the lubrication and oiling method of the cross roller ring bearing


The provided cross roller ring bearings have already been fully filled with high-quality No.2 lithium-based grease and can be used directly upon arrival.


The recommended interval for replenishing grease is every 6-12 months. For high-frequency rotation scenarios, the lubrication cycle needs to be shortened further.


In thin-section bearings, as there is no oil groove, please ensure to set oil grooves at the parts that match the bearing for timely refilling of lubricant. For other lubrication requirements, please get in touch.


In summary, selection and management are equally important. Choosing the suitable cross roller ring bearing combined with effective lubrication management can ensure the stable operation of your equipment.