EWA9 Series Slewing Drive

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 two 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.