EWA7 Series Slewing Drive

Slewing drive is a gearbox that handles radial or axial loads using high rotational torque. In addition, the slewing ring bearing, at the heart of the drive, enables it to withstand high overhung or moment loads. A descendant of the "worm" screw, slewing drives are present in construction machinery, manufacturing, military equipment, and many other applications that require strength and precision.The physics of the slew drive makes it a versatile solution for many applications. In operation, the slew drive's axial movement, or motion around its axis, interacts to create radial torque. The action occurs by meshing the grooves of the horizontal screw with the teeth of a perpendicular gear. While turning, the worm gear's axial movement transfers magnified torque force to the radial gear. The number of threads on the horizontal screw and the number of gears that interact will determine the speed ratio of the setup.

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
3.5 kN.m	14.7 kN.m	20.6 kN.m	227 KN	92.7 KN	47:1	<= 0.15 °	35Kg
2583 Lbf.ft	10800 Lbf.ft	15200 Lbf.ft	51000 Lbf	20800 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 slew 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.

Application Case

Because of the power and dependability generated by slew drive technology, the functions of this engineering technology apply to many types of equipment. One particular use, for example, involves solar technology, tracking the sun's movements in perfect time to generate maximum energy output.Robust, smooth, and consistent slew drives have a special place in manufacturing, construction, and many other venues. Based on a centuries-old engineering idea, slew drive-operated equipment can be simple or complex, depending upon the requirements. Any job requiring high load capacity and reliable positioning may require the implementation of slewing drive engineering.The list of active applications for slew drives is extensive. Several industries require some form of slew drive to make their operations more efficient. Equipment for mining, construction, metalworking, and other applications that require unrelenting strength combined with faultless precision use slewing technology for safety and accuracy. Powerful devices like aerial lifts, rotating forklifts, truck-mounted cranes, cable winders, fire trucks, hydraulic machinery, and utility equipment depend on the safety and strength of slew drives.

Custom Slewing Drives

Raydafon provides its customers with a high-quality application-based slew drives product line. Sizes range from 7.5" (200mm) up to 20" (500mm) in ID. Standard hydraulic or electric motors rotate the drive-through standard worm shaft inputs and can be assembled upon customer request, depending on their application.Our engineers are well equipped with the tools and technology necessary to work alongside our customers. We work to understand their applications, design requirements, project scope, and loads and help identify the most suitable products. We are ready to provide technical support and slew drive recommendations based on application requirements.For over three decades, slewing rings and slew drives have proven their worth in the most varied application areas. We've been supplying products to many of our customers for decades. We'd love to have the opportunity to win you over with our technological competence, too!