In the field of precision machinery, rodamientos de rodillos cruzados are highly sought after for their high precision, high rigidity, and compact design. They are widely used in critical equipment such as industrial robots, dispositivos médicos, CNC machine tools, and rotary tables. Sin embargo, to fully realize the potential of these bearings, a crucial step is preload. Proper preload calculation and application not only significantly improves bearing operating accuracy and rigidity, but also effectively extends its service life.
What is bearing preload? Why is it necessary?
Simplemente pon, bearing preload refers to the creation of an initial, predetermined contact stress within the bearing during installation, through a specific force or displacement. For rolling element bearings, this means that a certain amount of compression already exists between the rolling elements and raceways, even without external load.
Así, why is preload necessary? There are several main reasons:
Increase stiffness: Preload eliminates internal clearance (play) within the bearing. Once this clearance is eliminated, the bearing experiences less deformation when subjected to external loads, significantly increasing overall system stiffness. This is crucial for applications requiring high-precision positioning.
Improve running accuracy: Eliminating play means that the rolling elements maintain close contact with the raceways. This helps reduce runout and runout during movement, ensuring the bearing’s rotational and positioning accuracy.
Reduce vibration and noise: Preload effectively dampens vibration and shock from rolling elements under high speeds or variable loads, thereby reducing operating noise and improving equipment stability. Prolonging Service Life: Proper preload helps optimize load distribution between the rolling elements and raceways, avoiding localized stress concentrations and, to a certain extent, extending bearing fatigue life.
Preventing Slippage: In certain high-speed or light-load applications, preload can ensure that the rolling elements consistently roll rather than slip, preventing surface damage.
The Uniqueness of Preload in Crossed Roller Bearings
Unlike traditional deep groove ball bearings or tapered roller bearings, the rolling elements (typically cylindrical rollers) in crossed roller bearings are staggered 90 degrees between the inner and outer rings. This unique design allows a single bearing to simultaneously withstand radial, axial, and tilting moment loads.
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For more detailed information on preload calculation for crossed roller bearings, por favor haga clic para visitar:https://www.prsbearings.com/a/news/crossed-roller-bearing-preload-calculation.html
