China manufacturer EWA9 Series Slewing Drive with Hot selling

Slew drive often incorporates slewing ring, worm shaft, housing, motor, etc. Using slewing ring as the critical component, slew drive can handle heavy axial and tilting moment loads and features simple installation, easy maintenance, and compact size. The slew drives are widely used in heavy-duty flatcars, container cranes, truck-mounted solar power systems, wind turbines, aerial platforms, materials handling devices, and turntables.

Performance Parameters

Front View Top View

Output torque Tilting moment torque Holding torque Axial load Radial load Ratio Backlash Weight
输出转矩 倾覆力矩 保持力矩 轴向承载力 径向承载力 速比 精度 重量
8kN.m 35.6 kN.m 39.8 kN.m 580 KN 220 KN 62:1 <= 0.15 ° 52Kg
5904 Lbf.ft 26300 Lbf.ft 29370 Lbf.ft 130300 Lbf 49400 Lbf

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 onto the external slewing teeth. This force creates a rotation around the perpendicular axis of the slewing drive through the slewing outer ring.

A worm-wheel design allows 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.

Benefits of Using Slewing Drive Technology

Slew drives are a powerful and cost-effective alternative compared to traditional gearbox systems. Its advantages include:

  • 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 than a standard slew ring and pinion.
  • Space-saving: Slew drives allow for considerable space saving in the perpendicular planes as no other 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, including multiple drive motors to double the torque capacity.

Slew Drive Applications

Slewing products can be found in many applications, including:

  • 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.

Many of these applications are OEMs. Slew drives for OEMs can be customized to fit these high-volume OEM applications.


1. What is the producing process?

A: Production process including raw material cutting, machine processing, grinding, accessories cleaning, assemble, cleaning, stoving, oil coating, cover pressing, testing, and package.

2. How to control the product's quality?

A: Combining advanced equipment and strict management, we provide a high standard and quality slewing drive for our customers worldwide.

3: How long is your delivery time?

A: If there is stock, it is within 7 days; if there is no stock, it is 25-45 days, depending on the quantity.

4. Are you a trading company or a manufacturer?

A: We have our factory with 20 years of experience in slewing drive; our type is factory + trade.

5: What are your terms of payment?

A: Stocks goods,100% prepaid. If goods need to produce,30% prepaid and the balance paid before shipment. For big orders over 50000 USD, we can accept L/C At sight.

6. What is your MOQ?

A: For standard type, no MOQ. To produce goods, we need according to slewing drive type.

7. What is transportation?
A: Small quantity, by express, such as DHL, UPS, TNT FEDEX. If large quantity, by sea or air.

8. Can you provide OEM service?
A: Yes, we provide OEM service, do as your size, packing, and other requirements.

Additional information