China Standard EWA21 Series Slewing Drive near me supplier

Slewing drive is a new type of slewing product, usually also called slewing bearing. The main components of the slewing drive are a worm, slewing bearing, motor, casting base, and some standard parts such as bearings and bolts. Since the core component uses a turntable bearing (slewing bearing), it can bear axial force, radial force, and overturning moment at the same time. The rotary drive uses wheel and axle movement to reduce force consumption and play a role in safety protection. Compared with traditional rotary products, the slewing drive has the characteristics of simple installation, easy maintenance, and more significant installation space saving.

Basic Technology of Slewing Drive

Unique rotary deceleration products derived from slewing drive products with high height and large reduction ratio, simple structure, and convenient use and maintenance during slewing drive. Due to the use of slewing bearings as the follower and frame foundation, the inner and outer rings of the slewing bearings are used. The input and output of the driving power are realized separately so that the slewing drive can recognize the 360-degree rotation of the entire circumference without a dead point and install the driving power source based on the slewing support frame. Hence, its transmission efficiency is high, and a family of mechanical transmission devices. Because it is a deceleration device, it can also be called a slewing reducer, turntable reducer, or drive turntable.

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

Features of Slewing Drive

1. A large transmission ratio, which is more compact than the staggered shaft helical gear mechanism, can be obtained.

2. There is line contact between the meshing tooth surfaces of the 2 wheels, and its load-carrying capacity is much higher than that of the staggered-shaft helical gear mechanism.

3. Worm drive is equivalent to helical drive. It is a multi-tooth mesh drive, so the transmission is stable, and the noise is very low.

4. Self-locking of rotary drive. When the lead angle of the worm is less than the equivalent friction angle between the teeth of the meshing gears, the mechanism is self-locking, which can realize reverse self-locking.

5. The rotary drive transmission has low efficiency and severe wear. When the worm gear is driven, the relative sliding speed between the gear teeth is significant, so the friction loss is large, and the efficiency is low. And to dissipate heat and reduce wear, more expensive materials are often used, so the cost is higher.

Application Range of Slewing Drive

Slewing drives are mainly used in many industries, such as unique vehicle steering tables, heavy-duty flatbed trucks, and container cranes. Truck-mounted cranes, truck cranes, aerial work trucks, gantry cranes, small wind power stations, aerospace communications, satellite reception, solar tracking systems, and many other industries. Slewing drive is used in the solar photovoltaic power generation industry, generally equipped with slewing or AC gear motor; the hydraulic motor is mainly used as power drive on construction machinery. Especially in recent years, the rapidly developing solar photovoltaic power generation industry has been widely used.

Custom Slewing Drives

We can provide custom solutions for specific applications as a global slew drive and slew bearing manufacturer. We have a long and proud engineering history starting in 1925 and have worked at the cutting edge of slew drive technology ever since.

Benefits of our slew drive technology

— Long-life performance.
— Smooth rotation.
— Slew bearing protection.

Why Choose Us As Your Slew Drive Manufacturers?

— We provide custom slewing drive solutions.
— We can provide on-site slew drive gearbox installation.
— All of our slew drive gearboxes come with dedicated engineering support.


1. Where is your slew drive manufactured?

A: Our slew drives are all manufactured in China. We can design and produce slew drives, and the quality can also be guaranteed. At the same time, our slew drives price is more favorable.

2. I don't know which slew drive to use. Can you choose for me?

A: Yes, we have 2 product series of worm gear slew drives and spur gear slew drives. Each model has a parameter list on the website. You can choose the suitable slew drive according to these parameter lists. If you don't know how to choose, you can contact our engineers, and we will work with you to select a suitable product. We can also design a new slew drive solution for you according to your equipment.

3. Can I get your product catalog?

A: You can get our product catalog in the download or contact us. We will send the product catalog to you by email or other ways.

4. Can you customize products?

A: Yes, we can. Our engineers have an emotional experience in slew drive design. On the customized slew drives page, you can see some unique customized products designed by our engineers. These design solutions meet the particular needs of many customers. Our engineers can also work with you to design a new slew drive.

5: Can you provide accessories?

A: Yes, we can provide matching spare parts such as motors, hydraulic motors, and encoders compatible with slew drives.

6. Can you provide a 3D model?

A: Yes. All our slew drives have 3D models. You can contact us to get them. At the same time, we can also provide CAD files and PDF files.

7. How long is your slew drives warranty period?
A: Our slew drives warranty time is 12 months. When you install, use and store the slew drives, please refer to the slew drives instruction manual.

8. Can you choose the color of your slew drives housing?

A: Yes. Our slew drives housing is available in many colors. If you have special requirements, please tell our sales engineers, we are happy to provide services for you.

Additional information