Product Description

Slewing ring bearing is also called slewing ring, slewing bearing, turntable bearing, and rotary bearing. 
Slewing ring bearing is a bearing that CZPT to bear axial load, radial load and overturning torque. Under normal circumstances, slewing ring bearings have their own mounting holes, lubricant holes and seal holes, to meet the different needs of the various host working under the various conditions; 
On the other hand, slewing ring bearing itself has characteristics of compact structure, CZPT rotating convenient, easy to install and maintaining easily. 
1.Gear Heat Treatment

2. Structure
2.1 Slewing ring bearings have different types as per different structures, here below is what we offering now: 
Single row ball slewing ring bearings 
Double row ball slewing ring bearings
Crossed roller slewing ring bearings 
Three row roller slewing ring bearings 
Flange slewing ring bearings
2.2 The above slewing ring bearings can also be divided into 3 different types as per different transmissions:
Slewing ring bearings with no gear
Slewing ring bearings with external gear
Slewing ring bearings with internal gear
3. Features: 
Slewing ring bearings have more features: compact structure, reliable guide, simple installation, and easily maintenance
 
4. Application: 
Slewing ring bearings can be widely used in lifting & transport machinery, mining machinery, construction machinery, port hoisting machinery, port oil transfer equipment, onshore and offshore crane, excavator, concrete machine, paper machine, plastic and rubber machine, weave machine, steel plant, electronic power plant, wind power generator, other construction and industry machines or equipments and other large rotary device
Single row ball slewing ring bearing:

1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
The single row ball slewing ring bearing is composed of 2 seat-rings. The balls contact with the circular race at 4 points, via which the axial force, radial force and resultant moment may be born simultaneously.

2.2. Structure
Slewing ring bearings have different types as per different structures, here below is what we offering now:
Single row ball slewing bearing has 3 different types:
Single row ball slewing bearing with no gear 
Single row ball slewing bearing with external gear 
Single row ball slewing bearing with internal gear 
Single row ball slewing ring bearing
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
The single row ball slewing ring bearing is composed of 2 seat-rings. The balls contact with the circular race at 4 points, via which the axial force, radial force and resultant moment may be born simultaneously.
 
2. Structure
 
Slewing ring bearings have different types as per different structures, here below is what we offering now:
Single row ball slewing bearing has 3 different types:
Single row ball slewing bearing with no gear 
Single row ball slewing bearing with external gear 
Single row ball slewing bearing with internal gear 

3. Features
Single row ball slewing ring bearings have following features:
Compact in structure and light in weight.
 
4. Application: 
Single row ball slewing ring bearings are widely used in slewing conveyers, welding arm and positioned, medium duty cranes, excavators and other engineering machines
Double row ball slewing ring bearing:
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
The double row ball slewing bearing has 3 seat-rings. The steel balls and the retainers may be directly arranged into the upper and lower racers. Two rows of steel balls with different diameters are fitted according to the force. Such open type fitting is extraordinary convenient, the loading angels at upper and lower races are 90°which can carry both of the axial force and capsizing moment. When the radial force is larger than 1/10 of the axial force, the races should be newly designed.
 
2. Structure:
Double row ball slewing bearing has 3 different types:
Double row ball slewing bearing with no gear
Double row ball slewing bearing with external gear 
Double row ball slewing bearing with internal gear 
 
3. Features:
Double row ball slewing ring bearings have following features:
Larger dimension of axial and radial and compact structure.
 
4. Application:
Double row ball slewing ring bearings are widely used in Tower cranes which require working radius over medium range, auto crane and loading (unloading) machinery.
 Double row ball slewing ring bearing:
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
The double row ball slewing bearing has 3 seat-rings. The steel balls and the retainers may be directly arranged into the upper and lower racers. Two rows of steel balls with different diameters are fitted according to the force. Such open type fitting is extraordinary convenient, the loading angels at upper and lower races are 90°which can carry both of the axial force and capsizing moment. When the radial force is larger than 1/10 of the axial force, the races should be newly designed.
 
2. Structure:
Double row ball slewing bearing has 3 different types:
Double row ball slewing bearing with no gear
Double row ball slewing bearing with external gear 
Double row ball slewing bearing with internal gear 

3. Features:
Double row ball slewing ring bearings have following features:
Larger dimension of axial and radial and compact structure.
 
4. Application:
Double row ball slewing ring bearings are widely used in Tower cranes which require working radius over medium range, auto crane and loading (unloading) machinery.
Crossed roller slewing ring bearing
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
With the cross roller Ring, cylindrical rollers are arranged crosswise, with each roller perpendicular to the adjacent roller, in a 90° groove, separated from each other by a spacer retainer.  This design allows just 1 bearing to receive loads in all directions including, radial, axial and moment loads. Since the Cross-Roller Ring achieves high rigidity despite the minimum possible dimensions of the inner and outer rings, it is optimal for applications such as joints and swiveling units of industrial robots, swiveling tables of machining centers, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments and IC manufacturing machines.
 
2. Structure:
Cross roller slewing bearing has 3 different types:
Cross roller ball slewing bearing with no gear 
Cross roller ball slewing bearing with external gear 
Cross roller ball slewing bearing with internal gear 

3. Features
Cross roller slewing ring bearings have following features:
1. High precision: cross roller bearings can be made high precision bearings, at P4, P2.
2. High rigidity: These series roller bearings are with preload.
3. High load capacity: This series roller bearing can support axial load, radial load, and tilting load.
4. Small volume: this series roller bearing can save space for the machine.
 
4. Application 
Cross roller slewing rings are widely applied in the precision rotary table, rotary joint of manipulator, medical equipment, and measuring instrument etc
Triple row roller slewing ring bearing 
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
Three row roller slewing ring bearing has 3 seat-rings, which separate the upper, lower and radial raceway, via which the load of each row of the rollers may be specified. Thus it can carry different load simultaneously and its load capacity is the largest 1 of the 4 types
 
2. Structure:
Triple row roller slewing bearing has 3 different types:
Triple row roller slewing bearing with no gear
Triple row roller slewing bearing with external gear 
Triple row roller slewing bearing with internal gear 
 
3. Features   
Triple row roller slewing ring bearings have following features:
Larger axial and radial dimension, compact structure
 
4. Application
Triple row roller slewing rings are widely used in heavy-duty machines which require large working radius, such as bucket-wheel excavators, wheeled cranes, ship cranes, ladle turret, auto cranes etc.
 
Flange Slewing Bearing
1.Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing. 
Flange slewing bearing is a special slewing ring bearing, it can have 1 flange in the outer ring, or 1 flange in the inner ring, even it can have 1 flange in both inner ring and outer ring.
 
2. Structure:
Flange slewing bearing has 3 different types:
Flange slewing bearing with no gear
Flange slewing bearing with external gear 
Flange slewing bearing with internal gear 
 
3. Features   
Flange slewing bearings have following features:
Compact structure and easily installment.
 
4. Application
Flange slewing bearings are widely used in tow truck, and other applications are the same as slewing bearings, such as lifting & transport machinery, mining machinery, construction machinery, excavator, concrete machine, paper machine, plastic and rubber machine and steel plant.
 
Excavator Slewing Bearing
Excavator slewing bearing is a special slewing ring bearing as per its applications. And it is a very important part for excavators, we can supply excavator slewing bearings for both second-hand excavators for maintenance and new excavators.
 
2. Structure:
Excavator slewing bearing are usually made as per single row ball slewing bearing structure, and most of them are internal gear types, but some are external gear types.
 
3. Features   
Excavator slewing bearings have familiar features as single row ball slewing ring bearings.
Compact structure, light weight and easily installment.
 
4. Application
Excavator slewing bearings are widely used for all brands of excavators, such as Hitachi, Kobelco, Sumitomo, Doosan, Hyundai, Samsung, , Daewoo, Kato, CZPT and so on.

The suitable temperature and working environment for slewing bearing
The slewing bearing produced by our company can work normally at -300C.~+ 700C. If users need to adapt to lower or higher temperature support, our engineering technicians can design for you. If the slewing bearing are used in particularly hostile environment, such as Marine c1imate, dust or CZPT particles (dust, cement, coal powder) etc. Special sealing rings, protective devices, and proper oil paths must be selected. Therefore, we hope users to do the daily maintenance work to make your slewing bearing function normally

The suitable temperature and working environment for slewing bearing
The slewing bearing produced by our company can work normally at -300C.~+ 700C. If users need to adapt to lower or higher temperature support, our engineering technicians can design for you. If the slewing bearing are used in particularly hostile environment, such as Marine c1imate, dust or CZPT particles (dust, cement, coal powder) etc. Special sealing rings, protective devices, and proper oil paths must be selected. Therefore, we hope users to do the daily maintenance work to make your slewing bearing function normally

Installation  of slewing bearing
1.
Handling and transportation .The slewing bearing must be handled carefully

.Transportation and storage of slewing bearing should be held horizontally and stored in a dry room

.For hoisting lift bolt is suitable and please move it horizontally , do not hit anything, especially the direction collision

.The slewing bearing surface is covered with antitrust agent, whose rust proof life is usually 6 months For those whose storage

  life of more than 6 months (such as accessories) should take the antitrust package or other storage measures again

2.Installing support requirements .Generally, install matching support adopts tubular structure , the cylinder’s wall should be better

   aligned at the center of the raceway

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Standard or Nonstandard: Standard
Feature: High Speed, Vacuum, Antimagnetic, Cold-Resistant, Corrosion-Resistant, Heat-Resistant
Sealing Gland: Sealed On Both Sides
Rolling-Element Number: Single-Row
Roller Type: Spherical Raceway
Material: Bearing Steel
Samples:
US$ 1/Set
1 Set(Min.Order)

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Request Sample

Customization:
Available

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Customized Request

slewing bearing

What Role do Seals and Enclosures Play in Protecting Slewing Bearings from Contaminants?

Seals and enclosures play a crucial role in safeguarding slewing bearings from contaminants, moisture, and other external factors that can lead to premature wear and damage. Here’s how seals and enclosures contribute to the protection of slewing bearings:

  • Contaminant Exclusion:

Seals and enclosures create a physical barrier that prevents contaminants like dust, dirt, sand, and particles from entering the bearing’s internal components. This exclusion minimizes abrasive wear and preserves the integrity of the rolling elements and raceways.

  • Moisture and Corrosion Prevention:

Seals and enclosures provide a shield against moisture and water ingress, crucial in preventing corrosion and rust formation on bearing surfaces. Corrosion-resistant seals are particularly valuable in marine and humid environments.

  • Chemical and Chemical Vapor Resistance:

Specialized seals and enclosures can offer resistance to chemicals, acids, and corrosive substances that might be present in the operating environment. This protection prevents chemical damage to the bearing’s components.

  • Lubrication Retention:

Seals and enclosures help retain the lubricant within the bearing, preventing it from leaking out and ensuring consistent lubrication for smooth operation. This is essential for reducing friction and wear.

  • Prevention of Solid Particle Contamination:

Seals and enclosures block solid particles from entering the bearing chamber, reducing the risk of particle-induced wear, surface damage, and premature failure.

  • Temperature Regulation:

Some seals and enclosures offer thermal insulation, which helps regulate the operating temperature of the bearing. This can be crucial in applications with extreme temperature variations.

  • Enhanced Longevity:

By protecting the bearing from contaminants and adverse environmental conditions, seals and enclosures contribute to the extension of the bearing’s operational life, reducing the need for frequent replacements.

  • Sealing Types:

Seals can come in various types, including lip seals, labyrinth seals, and specialized designs. The choice of seal depends on the application’s requirements and the level of protection needed.

  • Proper Installation and Maintenance:

Proper installation and regular inspection of seals and enclosures are essential to ensure their effectiveness. Damaged or worn seals should be promptly replaced to maintain protection.

In summary, seals and enclosures serve as a critical defense mechanism for slewing bearings against contaminants, moisture, and harmful substances. They contribute to the bearing’s reliability, performance, and overall longevity in various operating environments.

slewing bearing

How does Preload Affect the Performance and Stability of Slewing Bearings?

Preload is a critical factor that can significantly impact the performance and stability of slewing bearings. It involves applying a controlled axial force to the bearing components before assembly. Here’s how preload affects slewing bearings:

  • Reduced Internal Clearance:

Applying preload reduces the internal clearance between the rolling elements and raceways. This minimizes play or clearance in the bearing, enhancing its rigidity and reducing the potential for rolling element skidding during operation.

  • Improved Stiffness:

Preloaded slewing bearings exhibit higher stiffness due to the elimination of internal clearance. This improved stiffness is crucial in applications requiring precise positioning, such as robotics and high-precision machinery.

  • Enhanced Load Distribution:

Preload improves the load distribution among rolling elements, minimizing stress concentrations and promoting uniform load sharing. This is especially important in applications with varying loads and forces.

  • Reduced Vibrations:

By eliminating internal clearance and minimizing rolling element movements, preloaded bearings experience reduced vibrations during operation. This contributes to smoother and more stable equipment performance.

  • Precise Positioning:

Preload ensures minimal movement within the bearing during rotational changes, making it suitable for applications where precise positioning and accurate motion control are essential.

  • Resistance to External Loads:

Preloaded bearings are better equipped to handle external forces and shocks without significant deformation or misalignment, maintaining consistent performance even under varying conditions.

  • Reduced Wear:

With reduced internal clearance and controlled movement, preloaded bearings experience less wear and fatigue. This extends their service life and reduces the frequency of maintenance.

  • Limitations:

However, excessive preload can lead to increased friction, heat generation, and potential damage. It’s essential to apply the right amount of preload according to manufacturer recommendations and application requirements.

In summary, preload in slewing bearings enhances rigidity, load distribution, and stability, making them suitable for applications that demand precise movement and control. Properly applied preload ensures optimal performance and extends the operational life of the bearing.

slewing bearing

What are the Main Applications of Slewing Bearings?

Slewing bearings find wide applications across various industries due to their ability to handle complex loads and facilitate rotational movement. Some of the main applications of slewing bearings include:

  • Construction Machinery: Slewing bearings are essential components in construction equipment such as excavators, cranes, concrete pumps, and drilling rigs. They enable smooth rotation and movement, supporting heavy loads and dynamic forces.
  • Wind Turbines: In wind energy systems, slewing bearings are used to orient the rotor blades and nacelle to capture maximum wind energy. Their durability and load-bearing capacity make them crucial for efficient wind turbine operation.
  • Mining Equipment: Slewing bearings are used in mining machinery like stacker-reclaimers and conveyor systems. They enable the movement of large loads, contributing to efficient material handling and processing.
  • Marine Applications: Slewing bearings are employed in ship cranes, davits, and other marine equipment. They assist in cargo handling, ship maintenance, and various onboard operations.
  • Aerial Work Platforms: Slewing bearings are integral to aerial platforms and access equipment. They enable controlled and safe movement for workers at elevated heights.
  • Robotics and Automation: Slewing bearings play a role in industrial robots and automation systems. They facilitate precise and controlled rotational movement in manufacturing processes.
  • Medical Equipment: Some medical imaging equipment, such as CT scanners and MRI machines, use slewing bearings for rotational movement, contributing to accurate diagnostics.
  • Defence and Aerospace: Slewing bearings are employed in defense equipment like radar systems and missile launchers, as well as in aerospace applications like aircraft landing gear.

These are just a few examples of the many applications of slewing bearings across different industries. Their ability to handle diverse loads and rotational movements makes them versatile components in various machinery and equipment.

China OEM Four Point Contact 011.60.2240 Slewing Ball Bearing   with Hot sellingChina OEM Four Point Contact 011.60.2240 Slewing Ball Bearing   with Hot selling
editor by CX 2024-05-17