Product Description

Worm Drive Performance Parameters
Model SEA9-61-R-24H.13.200-REV.C 
ID 175mm
OD 314mm
H 108mm
L 476mm
Output Torque 6.5 kN.m 
Tilting Moment Torque 33.9 kN.m 
Holding Torque 38.7 kN.m
Static Axial Rating 338 kN
Static  Radial Rating 135 kN
Dynamic Axial Rating 81 kN
Dynamic Radial Rating 71 kN
Gear Ratio 1:61
Tracking Precision ≤ 0.15°
Input  Ø14 Ø16 Ø20
Weight 49kg
APPLICATION Slewing Drive for solar tracking system
Slewing Drive for PV Application
Slewing Drive for Construction Machinery Application
Aerial working platform
 Manlifts, Skylifts
Telescopic boom skylifts
Articulating boom skylifts
Truck mounted crane
 lorry loaders
Loader cranes
Marine cranes
Hydraulic grapples
forklift attachments
woods log grapple
single axis solar tracker
dual axis solar tracker
solar tracking system

Product Description

What is slew drive?

A slew drive is a ready-to-install unit consisting of a ball or roller slewing ring for the simultaneous transfer of axial and radial forces as well as tilting moments with hydraulic or electric drives in a completely enclosed housing.

1.Slewing drive for solar tracking system
Vertical rotary slewing drive use enveloping worm, multi-tooth contact, adopts the characteristics of high bearing capacity, reliable static self-locking, stable operation, etc., in order to cope with the required driving torque and holding torque caused by the increasing size of the current components.
In view of the harsh environment of the photovoltaic industry, the company currently has C5 anti-corrosion grade, IP65 protection grade products, and achieves full model coverage, the existing SE3/VSE7/SE8/SE9/SE10 ect single-point slewing drive and VD7PA multi-point slewing drive and other models, the matching square tube range mold is 90-150mm, and can provide various shapes of output designs, providing customers with a variety of models to choose from, mainly used for flat uniaxial photovoltaic tracking brackets.

2.Slewing drive for engineering machinery
The horizontal rotary reducer adopts the meshing transmission of the enveloping worm or the straight worm and the slewing bearing. It not only has a large contact surface of the teeth, high hardness, strong wear resistance, but also has the strong anti-overturning performance of the slewing bearing and the radial force of the shaft. The bearing capacity is high and the service life is long. The horizontal rotary reducer can be adapted to most of the power equipment on the market (hydraulic motor, DC motor, AC motor, servo, stepper motor, etc.) to meet the overall equipment needs of customers. The existing products are fully covered from 5-25 inches , widely used in ship cranes, cranes, coal mining machinery, cutting equipment, aerial work vehicles, automatic rotating platforms and other fields.


1.Spur gear unit or worm drive
2.Max. torques of up to 450 kNm
3.Max. tilting moment load of up to 1,200 kNm
4.Raceway diameter of up to approx. 1,000 mm
5.Unlimited slewing range
6.Fast installation
7.Smooth, jolt-free movement – no stick/slip effect
8.Maximum safety through full encapsulation
9.Cost-efficient, proven technology
10.Compact, space-saving, heavy duty

How Do Slew Drives Work?

The mechanics behind it is built on the concept of a worm wheel where a slewing ring with external teeth is meshed with complementing worm gear with a predefined gear ratio. Internal components are contained and assembled inside a cast iron or aluminum housing for protection and installation. 

The unique design of a slew drive allows it to utilize 2 perpendicular planes transmitting high output rotational torque with a relative speed ratio to its inputs. As the worm gear rotates through a low input torque on the horizontal plane, its hardened teeth translate rotational motion CHINAMFG the external slewing teeth. This force creates a rotation around the perpendicular axis of the slew drive through the slewing outer ring.

The use of a worm-wheel design makes room for a wide range of low torque inputs to the slew drive to transmit or hold high torque applications. Slew drives can be found across several constructions and heavy machinery equipment. The versatility and weight allow slew drives to act as an immediate solution to rotary-related issues.


High power density: While slewing rings are most commonly used to generate slew rotation, slew drive technology capitalizes on the capacity of its internal slewing ring while introducing a built-in driving force through the worm gear. Speed and reduction ratios are better controlled through the worm wheel design as opposed to a standard slew ring and pinion.
Space-saving: Slew drives allow for considerable space saving in the perpendicular planes as no additional gearboxes are required for speed reduction.
Protection for internal components: In harsh environments, an enclosed housing slewing drive protects the internal components from debris and contamination through different sealing solutions.
Plug and play: Slew drives can be integrated and installed into any system once they are in place and attached to a power source. This setup is an improvement from the corrective adjustments made on older systems.
Customizable: Slew drives can be customized to meet their application, such as including multiple drive motors to double the torque capacity.


Construction equipment.
Renewable energy solar trackers and wind turbines.
Turntables and welding positioners.
Packing and packaging equipment.
Assembly lines.
Aerial platforms.
Vacuum Trucks.
Public transportation.

Slew drives, also known as worm driven bearings, slewing rings or four-point contact ball bearings, are used in a wide range of applications in various sectors. Some examples of sectors where slew drives are used include:

Construction machinery: Slew drives are used in excavators, cranes, and other construction equipment to provide smooth and precise rotation. This allows the equipment to perform tasks such as CHINAMFG and lifting more efficiently.

Wind energy: Slew drives are used in wind turbines to provide rotational movement for the blades. This allows the turbine to capture wind energy more efficiently.

Wind energy: Slew drives are used in wind turbines to provide rotational movement for the blades. This allows the turbine to capture wind energy more efficiently.

Industrial automation: Slew drives are used in robotic systems and other automated equipment to provide precise and reliable rotation. This allows the equipment to perform tasks such as sorting, packaging, and assembly with greater efficiency.
Mining equipment: Slew drives are used in mining equipment such as excavators, conveyors, and crushers. This allows the equipment to perform tasks such as digging, moving, and crushing ore more efficiently.

Marine equipment: Slew drives are used in marine equipment such as cranes, winches, and davits. This allows the equipment to perform tasks such as lifting and positioning heavy loads with greater precision.

Defense and aerospace: Slew drives are used in militari and aerospace equipment such as radar systems and missile launchers. This allows the equipment to track targets and move in a precise and controlled manner.

Agriculture: Slew drives are used in agricultural equipment such as irrigation systems, sprayers, and harvesters. This allows the equipment to perform tasks such as watering, spraying, and harvesting crops with greater efficiency.

Transportation: Slew drives are used in transportation equipment such as cranes and gantries used for loading and unloading cargo. They are also used in bridge and tunnel construction equipment to provide smooth and precise rotation.

Entertainment industry: Slew drives are used in amusement park rides, such as Ferris wheels and roller coasters, to provide smooth and controlled rotational movement.
Medical equipment: Slew drives are used in medical equipment such as patient lifts and adjustable hospital beds. This allows the equipment to provide smooth and controlled movement for patient comfort and safety.

Environmental equipment: Slew drives are used in environmental equipment such as water treatment plants and waste management systems. This allows the equipment to perform tasks such as filtering, separating, and treating waste and water with greater efficiency.

Oil and gas industry: Slew drives are used in oil and gas equipment such as drilling rigs and offshore cranes. This allows the equipment to perform tasks such as drilling, lifting, and positioning with greater precision.

Aerospace industry: Slew drives are used in aerospace equipment such as satellite dishes and solar panels on space missions. This allows the equipment to track and move with precision in the harsh conditions of space
In summary, slew drives are used in a diverse range of sectors and applications where precise and efficient rotational movement is required. They play a critical role in improving productivity, safety, and performance in various industries.

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Feature: High Speed, Cold-Resistant, Corrosion-Resistant
Step: Stepless
Layout: Coaxial
Openness: Closed
Installation: Horizontal
Transmission Form: Worm


Can you provide examples of products or machinery that commonly use slewing rings?

Slewing rings are widely used in various industries and play a vital role in the functioning of numerous products and machinery. They offer rotational support, precise motion control, and load-bearing capabilities. Here are some examples of products or machinery that commonly utilize slewing rings:

  • Construction Machinery: Slewing rings are extensively used in construction machinery such as excavators, cranes, concrete pumps, and tower cranes. They enable the rotation and movement of the boom, arm, and bucket, allowing for precise control during digging, lifting, and material placement operations.
  • Material Handling Equipment: Slewing rings are essential components in material handling equipment like forklifts, stackers, and reach stackers. They facilitate the rotation and swiveling of the mast or boom, enabling efficient loading, unloading, and stacking of goods in warehouses, logistics centers, and ports.
  • Wind Turbines: Slewing rings are crucial in wind turbines, where they support the yaw and pitch mechanisms. The yaw system allows the turbine to rotate and face the wind direction, while the pitch system adjusts the angle of the blades for optimal wind capture. Slewing rings enable precise and controlled movement, ensuring efficient wind energy conversion.
  • Cranes: Various types of cranes, including mobile cranes, crawler cranes, and tower cranes, rely on slewing rings for their rotation and lifting capabilities. Slewing rings support the crane’s superstructure, allowing it to rotate horizontally, and provide stability and load-bearing capacity during lifting operations.
  • Rotary Drilling Rigs: Slewing rings are commonly used in rotary drilling rigs for oil and gas exploration, foundation construction, and mining operations. They enable the rotation and positioning of the drill mast, allowing for precise drilling and borehole creation.
  • Railway Equipment: Slewing rings find application in railway equipment such as rail cranes, railway maintenance machines, and turntables. They facilitate the rotation and movement of equipment, ensuring efficient maintenance, repairs, and track positioning.
  • Robotics: Slewing rings are integral to robotic systems, including industrial robots, robotic arms, and robotic welding systems. They enable the rotational movement and articulation of the robot’s joints, allowing for precise and controlled manipulation in manufacturing, assembly, and automation processes.
  • Solar Tracking Systems: Slewing rings are employed in solar tracking systems to orient solar panels toward the sun. They enable the rotation and tilting of the panels, maximizing solar energy absorption and optimizing power generation in solar farms and photovoltaic systems.
  • Turntables and Rotating Platforms: Slewing rings are used in turntables and rotating platforms found in various applications. They support the rotational movement of entertainment stages, amusement park rides, revolving restaurants, and display platforms in trade shows or exhibitions.

These are just a few examples of the diverse range of products and machinery that commonly utilize slewing rings. Their ability to provide rotational support, precise motion control, and load-bearing capabilities makes them indispensable components in numerous industries, including construction, material handling, energy, transportation, robotics, and entertainment.

What is a slewing ring, and how is it used in mechanical systems?

A slewing ring, also known as a slewing bearing or turntable bearing, is a specialized type of rolling element bearing that enables rotational movement between two components. It consists of an inner ring, an outer ring, rolling elements (such as balls or rollers), and often a gear mechanism. Slewing rings are used in mechanical systems where there is a need for smooth and controlled rotation. Here’s a detailed explanation of what a slewing ring is and how it is used:

  • Structure and Components: A slewing ring typically has a large diameter compared to its thickness, allowing it to support axial, radial, and moment loads. The inner and outer rings have raceways that the rolling elements move along. The rolling elements, which can be balls or rollers, distribute the load and facilitate smooth rotation. In some cases, a gear mechanism is integrated into the slewing ring, allowing it to act as a rotational drive system.
  • Rotational Movement: The primary function of a slewing ring is to enable rotational movement between two components. It provides a stable and low-friction interface that allows one component to rotate relative to the other. The rolling elements within the raceways minimize friction and distribute the load evenly, resulting in smooth and controlled rotation. Slewing rings can support both continuous rotation and intermittent or oscillating movement, depending on the application requirements.
  • Load Support: Slewing rings are designed to support various types of loads. They can handle axial loads, which are forces acting parallel to the axis of rotation, as well as radial loads, which are forces acting perpendicular to the axis of rotation. Additionally, slewing rings can accommodate moment loads, which are a combination of axial and radial loads that create bending or twisting forces. The load-carrying capacity of a slewing ring depends on factors such as its size, design, and choice of rolling elements.
  • Applications: Slewing rings find applications in a wide range of mechanical systems across different industries. Some common uses include:
  • Construction and Cranes: Slewing rings are extensively used in construction machinery, cranes, and mobile equipment. They enable 360-degree rotation of the boom or jib, allowing for efficient material handling and positioning.
  • Wind Turbines: Slewing rings are crucial components in wind turbine systems. They support the rotor, allowing it to rotate according to wind direction, and provide a connection between the rotor and the nacelle, enabling yaw movement.
  • Industrial Equipment: Slewing rings are utilized in various industrial equipment, including indexing tables, turntables, robotic arms, and packaging machinery. They facilitate precise and controlled rotation in these applications.
  • Transportation and Automotive: Slewing rings are employed in transportation and automotive applications, such as vehicle cranes, aerial platforms, and rotating platforms for heavy-duty vehicles. They enable safe and smooth rotation in these specialized systems.
  • Medical and Rehabilitation Equipment: Slewing rings are used in medical and rehabilitation equipment, such as patient lifts and adjustable beds. They allow for smooth and controlled movement, aiding in patient care and mobility assistance.

In summary, a slewing ring is a specialized bearing that enables controlled rotational movement between components in mechanical systems. Its ability to support various loads, provide smooth rotation, and accommodate different applications makes it a valuable component in a wide range of industries.

What advantages do slewing rings offer compared to other rotational components?

Slewing rings offer several advantages compared to other rotational components. Their unique design and features make them a preferred choice in various applications. Here’s a detailed explanation of the advantages that slewing rings offer:

  • Compact Design: Slewing rings have a compact design that allows for efficient use of space. Compared to other rotational components such as gears and bearings, slewing rings provide a compact solution for supporting axial, radial, and moment loads while enabling rotational motion. Their compactness is especially advantageous in applications with limited space or weight constraints.
  • High Load-Carrying Capacity: Slewing rings are designed to handle significant loads. They are capable of supporting both axial and radial loads, as well as moment loads that result from uneven weight distribution or external forces. The robust construction and precise engineering of slewing rings enable them to withstand heavy loads, making them suitable for applications that require high load-carrying capacity.
  • Smooth Rotation: Slewing rings offer smooth rotation, allowing for precise and controlled motion. The rolling elements, whether balls or rollers, are positioned and guided within the raceways of the slewing ring to minimize friction and ensure smooth movement. This smooth rotation contributes to precise positioning and controlled motion, which is essential in applications that require accurate positioning and smooth operation.
  • Integrated Gear Mechanism: Many slewing rings come with an integrated gear mechanism. This eliminates the need for additional gearing components, simplifies the design, and reduces assembly time and costs. The integrated gear mechanism allows for torque transmission and rotational control, enabling precise and controlled motion without the need for external gearing systems.
  • Backlash Control: Slewing rings can be designed with minimal backlash, ensuring precise motion control. Backlash refers to the play or clearance between mating gears or components, which can lead to lost motion or inaccuracies in positioning. By minimizing backlash, slewing rings offer improved accuracy and repeatability in motion control applications.
  • Versatility and Customization: Slewing rings are highly versatile and can be customized to meet specific application requirements. They can be tailored in terms of dimensions, load capacity, mounting interfaces, gear specifications, sealing systems, and materials. This versatility allows slewing rings to be optimized for various industries and applications, ensuring the best performance and compatibility.
  • Durable and Low Maintenance: Slewing rings are designed to be durable and require minimal maintenance. They are constructed with high-quality materials, precision manufacturing, and appropriate sealing systems to withstand harsh operating conditions and contaminants. This durability and low maintenance requirement contribute to the long service life and reliability of slewing rings.

Overall, slewing rings offer advantages such as compact design, high load-carrying capacity, smooth rotation, integrated gear mechanism, backlash control, versatility, customization options, and durability. These advantages make slewing rings a preferred choice in various applications, including construction machinery, material handling equipment, cranes, wind turbines, robotics, and manufacturing systems.

China Hot selling Sea9-61-R-24h. 13.200-Rev. C Solar Tracker Slewing Drive and Slewing Ring  China Hot selling Sea9-61-R-24h. 13.200-Rev. C Solar Tracker Slewing Drive and Slewing Ring
editor by Dream 2024-05-14