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Three-row roller slewing bearing is a specially designed slewing bearing, which is widely used in mechanical equipment that bears heavy loads, high overturning moments and complex combined loads. It is called "the joint of the machine" because of its unique structure and excellent load-bearing capacity.
Depending on application requirements, gears can be machined on the outer ring or inner ring to facilitate cooperation with the transmission mechanism (such as a pinion) to achieve rotational drive of the equipment.
Cages or spacers are usually set between the rollers to ensure that the rollers are evenly distributed, reduce friction and interference between the rollers, and improve rotation smoothness.
In order to accommodate three rows of rollers, multiple raceways are designed on the inner ring, outer ring and middle ring of the slewing bearing, which are usually hardened raceways to improve the load-bearing capacity and wear resistance.
This design enables the three-row roller slewing bearing to effectively bear axial force, radial force and overturning moment at the same time, realizing comprehensive bearing of multi-directional loads.
Rollers are usually separated by cages or spacers to ensure that the rollers are evenly distributed, reduce friction and interference between them, and thus make the rotation process smoother and reduce operating noise and vibration.
Due to its unique load-bearing capacity and rigidity, three-row roller slewing bearings are indispensable key components in large and heavy machinery and equipment, such as large excavators, port cranes, shield machines, wind turbines, metallurgical equipment, etc.
Despite its strong load-bearing capacity, the three-row roller slewing bearing can achieve high load bearing capacity in a relatively compact size by optimizing the roller arrangement and raceway design, which contributes to the lightweight and space utilization of the overall equipment design.
Multi-directional loads are borne simultaneously: This is its core feature. It has three independent rows of rollers and corresponding raceways. Two rows of rollers (usually arranged horizontally or slightly tilted) mainly bear huge axial loads (forces perpendicular to the rotating plane) and overturning moments (forces that tilt the equipment), while the other row of rollers (usually arranged vertically) is dedicated to radial loads (forces parallel to the rotating plane).
This design with clear division of labor enables it to handle compound loads efficiently, far exceeding other types of slewing bearings.
Roller force optimization: Since the load is distributed to different roller rows, each row of rollers can work in the best force direction, thereby effectively improving the overall load limit.
Multi-roller support: The three-row roller configuration provides more support points, making the entire slewing bearing extremely rigid and small in deformation when bearing heavy loads.
Precision structure: High rigidity is essential for heavy equipment that requires precise rotation and positioning, such as the precise control of large crane booms and the stable rotation of shield machine cutterheads.
In order to facilitate integration with the drive system, the outer ring or inner ring of the slewing bearing can be processed with gears (internal teeth, external teeth or no teeth) according to requirements, which simplifies the design and installation of the transmission mechanism.
