- +86 13837949030 +86 15890619536
- info@lymcbearings.com export@lymcbearings.com
- Bearing Zone,Luoxin Industrial Cluster, Luoyang City,Henan Province,China
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.
A Three-row Roller Slewing Bearing is a heavy-duty rotational bearing designed to simultaneously support axial loads, radial loads, and overturning moments. The bearing uses three separate rows of cylindrical rollers, allowing each row to independently handle different load directions. This structural design provides higher load-carrying capacity than single-row or double-row slewing bearings.
Manufacturers commonly use Three-row Roller Slewing Bearings in cranes, offshore equipment, mining machinery, port handling systems, and large industrial turntables.
The main advantage of a Three-row Roller Slewing Bearing is its exceptional load capacity. Because the bearing separates axial, radial, and tilting loads into different roller rows, the contact stress distribution becomes more balanced.
Additional advantages include:
Higher rigidity
Improved operational stability
Longer service life under heavy loads
Better shock resistance
Lower deformation during operation
Suitable for large-diameter equipment
This bearing type performs especially well in demanding applications with continuous heavy-duty operation.
The bearing contains three independent roller systems:
The upper roller row primarily carries axial loads
The lower roller row supports reverse axial loads
The middle roller row absorbs radial forces
This load separation minimizes internal friction and improves overall rotational stability. The rollers usually maintain a 90-degree arrangement relative to the raceways to maximize contact efficiency.
Many heavy industries rely on Three-row Roller Slewing Bearings because of their high load performance and structural reliability.
Common applications include:
Tower cranes
Ship cranes
Offshore platforms
Bucket wheel excavators
Port machinery
Metallurgical equipment
Wind energy systems
Rotary drilling rigs
Construction machinery
Heavy-duty welding positioners
These industries often require bearings capable of operating under high loads, low rotational speeds, and harsh environmental conditions.
Most manufacturers produce these bearings using high-quality alloy steel or forged bearing steel. The raceways usually undergo induction hardening or through-hardening treatment to improve wear resistance and fatigue life.
For demanding environments, manufacturers may also provide:
Corrosion-resistant coatings
Stainless steel components
Customized heat treatment
High-strength cage materials
Special sealing systems
The material selection depends on working conditions, environmental exposure, and expected service life.
A Three-row Roller Slewing Bearing offers higher load capacity and rigidity because the rollers distribute loads more efficiently across multiple contact surfaces.
A Four-point Contact Ball Slewing Bearing generally provides:
Lower weight
Smaller installation size
Simpler structure
Higher rotational speed capability
However, heavy-duty equipment usually prefers Three-row Roller designs because they handle large overturning moments and shock loads more effectively.
Lubrication intervals depend on operating conditions, rotational speed, temperature, and working environment.
Heavy-duty applications usually require regular grease replenishment to maintain smooth roller contact and reduce internal wear. Equipment operating in dusty, humid, or high-temperature environments often needs more frequent lubrication maintenance.
Manufacturers typically recommend periodic inspection of grease condition and seal integrity.
Heavy industries often operate under extreme loads and demanding working conditions. The Three-row Roller structure delivers superior rigidity, high carrying capacity, and stable rotational performance.
Compared with lighter slewing bearing designs, this structure better withstands:
Large overturning moments
Continuous heavy loading
Impact forces
Low-speed high-torque operation
These characteristics make it one of the most reliable bearing solutions for large rotating equipment.
Professional bearing manufacturers usually provide:
Engineering load analysis support
Material traceability
Heat treatment documentation
Precision machining control
Quality inspection reports
Customized design capability
After-sales technical support
Buyers should also evaluate production experience, manufacturing equipment, and testing capabilities before selecting a supplier.
Yes. Many manufacturers provide customized solutions based on equipment requirements.
Common customization options include:
External gear or internal gear structures
Non-gear configurations
Special dimensions
Customized bolt hole patterns
Corrosion-resistant coatings
Integrated sealing systems
High-temperature grease options
Customized slewing bearings help equipment manufacturers optimize structural compatibility and operational performance.
