China best EWA21-2 Series Slewing Drive with high quality

The dual-worm slewing drive achieves the goal of linear contact between the rolling elements and the raceway by setting the double row raceway and the double row cylindrical roller. And the raceway has a certain inclination angle, thereby increasing the load carrying capacity so that the bearing can support axial and radial loads and significant overturning moments. Because the outer teeth are set in the middle of the height of the outer circle of the inner ring, the worm gear can be installed on the outer circle of the inner ring, which is comparable to the existing double row 4 with external teeth.

In this device, 2 worms are used to drive the external ring gear of the slewing ring. The inner circle is fixed above the seat ring of the base, and the first shaft shell and the second shaft shell are symmetrically arranged on the base’s outer side of the seat ring. The axis lines are perpendicular to each other in space; the first worm is installed in the first shaft housing; the second worm is installed in the second shaft housing. The first worm and the second worm are both meshed with the outer gear ring. The translational forces of the 2 worms offset each other. At the same time, the gap between the worm and the outer ring gear can be “eliminated” to achieve precise positioning of the rotation angle of the external ring gear. The dual-worm slewing drive has a simple structure and practical design and can be widely used in engineering machinery, construction machinery, solar photovoltaic, and other industries.

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
48 kN.m 203 kN.m 181 kN.m 1600 KN 650 KN 90:1 <= 0.13 ° 200Kg
35400 Lbf.ft 150000  Lbf.ft 141000 Lbf.ft 359700 Lbf 146000 Lbf

Characteristics of Slewing Drive

1, closed structure design, sealing and dustproof better;
2, using the worm gear pair, which can transfer bigger torque and run more smoothly;
3, the installation is convenient and can be directly through the bolt and the basis of connected;
4, ring surface worm drive can provide greater torque.
1, with size and performance parameters, refer to the rotary drive sample;
2, according to customer needs matching different hydraulic motor;
3, we can also, according to your requirements for you to customize;

Company Profile

With the tenet of operating with integrity and serving all customers, our company is constantly working on new technologies and machines for double worm slewing drives, small slewing drives, large slewing bearings, worm slewing bearings, and slewing bearing replacement. We focus on creating our brand with many seasoned terms and top-notch equipment. You deserve our products. Products in Europe, America, Australia, St. Petersburg, Bahamas, Peru, and Sydney will be supplied worldwide. We hope to establish a long-term cooperative relationship with all customers and hope that we can improve our competitiveness and achieve a win-win with our customers. We sincerely welcome customers from all over the world to contact us for anything you need! All customers at home and abroad are welcome to visit our factory. We hope to establish a win-win business relationship with you for a better tomorrow.

All parts are produced in strict accordance with the drawings and assembled after passing the inspection due to the practical design, precise processing size of the details, the one-time assembly has been done, and product qualified meeting customer requirements, the rotation of the slewing drives is flexible. No noise, the overall accuracy is perfect, the center distance cannot be adjusted during the double worm shaft slewing drive assembly, the matching size requirements are relatively strict, and the matching size must be strictly controlled during the design and processing process. Otherwise, there will be problems during assembly, and they will be difficult to solve.

Our slewing drives are available in a large variety of standard design sizes. We will gladly develop a slewing drive tailored to your requirements if you are looking for an individual solution.

Contact us – we will be happy to help you!


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