China Professional EWA21 Series Slewing Drive wholesaler

The slewing drive is also called a worm-type slewing reducer, a full-circle slewing reduction transmission mechanism that integrates a driving power source. This product is suitable for low-speed applications. It is generally composed of a worm, a slewing bearing, a housing, a motor, or a motor. In terms of carrying capacity, the worm gear type performs exceptionally well.

Compared with traditional rotary products, the rotary drive adopts an envelope worm transmission, which can obtain a relatively large reduction ratio; its carrying capacity, Anti-deformation ability, and higher transmission rigidity. The worm gear drive has reverse self-locking characteristics, which can realize reverse self-locking. That is, the worm can only drive the worm, but the worm cannot be caused by the worm, significantly improving the main machine’s operational stability and safety factor.

Slew Drive Specifications

1) Tilting Moment Torque: Torque is the load multiplied by the distance between the position of load and the center of slewing bearing. If the torque generated by load and length is greater than the rated tilting moment torque, slewing drive will be overturned.

2) Radial load: Load vertical to the axis of slewing bearing

3) Axial load: Load parallel to the axis of slewing bearing

4) Holding torque: It is the reverse torque. When the drive is rotating reversely and parts are not damaged,

5) The maximum torque achieved is called holding torque.

6) Self-locking: Only when loaded the slewing drive cannot reverse rotate, thus called self-locking.

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
28.7 kN.m 203 kN.m 107 kN.m 1600 KN 650 KN 90:1 <= 0.1 ° 170Kg
21180 Lbf.ft 150000  Lbf.ft 78900 Lbf.ft 35700 Lbf 146000 Lbf

Industry Applications

The slewing drive can be used in any situation requiring full-circle rotation and variable speed. When it is necessary to achieve more excellent torque power transmission, higher precision motion transmission, or the selection of a mechanism that requires a high degree of compactness and integration of the body structure, the slewing drive Is the best solution.

The more common applications are the full-circle slewing structure of engineering and construction machinery, solar energy, wind energy, and various long-term automatic tracking machinery. Due to the compact design and short transmission chain, the slewing drive is easier to achieve higher accuracy and more It is easy to carry out digital control, so there are many applications in the field of industrial robots.

Choose Our Advantage

–Customer can choose the motor according to our already designed slewing drive connect dimension.

–We can design the connecting structure according to the customer’s motor connect dimension.

–We can help provide the parts with Hydraulic motor, DC motor, AC motor, Stepper or Servo motor.


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